siljehra

• Aaboud, Morad; Aad, Georges; Abbott, Brad; Abdinov, Ovsat Bahram oglu; Abeloos, Baptiste & Abidi, Syed Haider [Vis alle 51 forfattere av denne artikkelen] (2019). Search for light resonances decaying to boosted quark pairs and produced in association with a photon or a jet in proton–proton collisions at √s=13 TeV with the ATLAS detector. Physics Letters B. ISSN 0370-2693. 788, s. 316–335. doi: 10.1016/j.physletb.2018.09.062. Fulltekst i vitenarkiv Vis sammendrag

  This Letter presents a search for new light resonances decaying to pairs of quarks and produced in association with a high-p_T photon or jet. The dataset consists of proton–proton collisions with an integrated luminosity of 36.1 fb^−1 at a centre-of-mass energy of √s = 13 TeV recorded by the ATLAS detector at the Large Hadron Collider. Resonance candidates are identified as massive large-radius jets with substructure consistent with a particle decaying into a quark pair. The mass spectrum of the candidates is examined for local excesses above background. No evidence of a new resonance is observed in the data, which are used to exclude the production of a lepto-phobic axial-vector Z' boson.

• Aaboud, Morad; Aad, Georges; Abbott, Brad; Abdinov, Ovsat Bahram oglu; Abeloos, Baptiste & Abidi, Syed Haider [Vis alle 51 forfattere av denne artikkelen] (2018). Search for exclusive Higgs and Z boson decays to ϕγ and ργ with the ATLAS detector. Journal of High Energy Physics (JHEP). ISSN 1126-6708. 2018:127(7), s. 1–37. doi: 10.1007/JHEP07(2018)127. Fulltekst i vitenarkiv Vis sammendrag

  A search for the exclusive decays of the Higgs and Z bosons to a φ or ρ meson and a photon is performed with a pp collision data sample corresponding to an integrated luminosity of up to 35.6 fb−1 collected at √ s = 13 TeV with the ATLAS detector at the CERN Large Hadron Collider. These decays have been suggested as a probe of the Higgs boson couplings to light quarks. No significant excess of events is observed above the background, as expected from the Standard Model. Upper limits at 95% confidence level were obtained on the branching fractions of the Higgs boson decays to φγ and ργ of 4.8 × 10−4 and 8.8 × 10−4 , respectively. The corresponding 95% confidence level upper limits for the Z boson decays are 0.9 × 10−6 and 25 × 10−6 for φγ and ργ, respectively.

• Aaboud, Morad; Aad, Georges; Abbott, Brad; Abdinov, Ovsat Bahram oglu; Abeloos, Baptiste & Abidi, Syed Haider [Vis alle 51 forfattere av denne artikkelen] (2018). Search for Higgs boson decays to beyond-the-Standard-Model light bosons in four-lepton events with the ATLAS detector at √s=13 TeV. Journal of High Energy Physics (JHEP). ISSN 1126-6708. 2018:166, s. 1–50. doi: 10.1007/JHEP06(2018)166. Fulltekst i vitenarkiv Vis sammendrag

  A search is conducted for a beyond-the-Standard-Model boson using events where a Higgs boson with mass 125 GeV decays to four leptons (ℓ = e or μ). This decay is presumed to occur via an intermediate state which contains one or two on-shell, promptly decaying bosons: H → ZX/XX → 4ℓ, where X is a new vector boson Zd or pseudoscalar a with mass between 1 and 60 GeV. The search uses pp collision data collected with the ATLAS detector at the LHC with an integrated luminosity of 36.1 fb−1 at a centre-of-mass energy 𝑠√=13 TeV. No significant excess of events above Standard Model background predictions is observed; therefore, upper limits at 95% confidence level are set on modelindependent fiducial cross-sections, and on the Higgs boson decay branching ratios to vector and pseudoscalar bosons in two benchmark models.

• Aaboud, Morad; Aad, Georges; Abbott, Brad; Abdinov, Ovsat Bahram oglu; Abeloos, Baptiste & Abidi, Syed Haider [Vis alle 51 forfattere av denne artikkelen] (2018). Measurement of the production cross-section of a single top quark in association with a Z boson in proton–proton collisions at 13 TeV with the ATLAS detector. Physics Letters B. ISSN 0370-2693. 780, s. 557–577. doi: 10.1016/j.physletb.2018.03.023. Fulltekst i vitenarkiv Vis sammendrag

  The production of a top quark in association with a Z boson is investigated. The proton–proton collision data collected by the ATLAS experiment at the LHC in 2015 and 2016 at a centre-of-mass energy of are used, corresponding to an integrated luminosity of . Events containing three identified leptons (electrons and/or muons) and two jets, one of which is identified as a b-quark jet are selected. The major backgrounds are diboson, and production. A neural network is used to improve the background rejection and extract the signal. The resulting significance is 4.2σ in the data and the expected significance is 5.4σ. The measured cross-section for tZq production is.

• Aaboud, Morad; Aad, Georges; Abbott, Brad; Abdinov, Ovsat Bahram oglu; Abeloos, Baptiste & Abidi, Syed Haider [Vis alle 51 forfattere av denne artikkelen] (2018). Measurement of the exclusive γγ → μ+ μ− process in proton–proton collisions at √s = 13 TeV with the ATLAS detector. Physics Letters B. ISSN 0370-2693. 777, s. 303–323. doi: 10.1016/j.physletb.2017.12.043. Fulltekst i vitenarkiv Vis sammendrag

  The production of exclusive events in proton–proton collisions at a centre-of-mass energy of 13 TeV is measured with the ATLAS detector at the LHC, using data corresponding to an integrated luminosity of 3.2 fb−1. The measurement is performed for a dimuon invariant mass of . The integrated cross-section is determined within a fiducial acceptance region of the ATLAS detector and differential cross-sections are measured as a function of the dimuon invariant mass. The results are compared to theoretical predictions both with and without corrections for absorptive effects.

• Aaboud, Morad; Aad, Georges; Abbott, Brad; Abdinov, Ovsat Bahram oglu; Abeloos, Baptiste & Abidi, Syed Haider [Vis alle 51 forfattere av denne artikkelen] (2018). Measurement of the Higgs boson coupling properties in the H → ZZ∗ → 4ℓ decay channel at s√=13 TeV with the ATLAS detector. Journal of High Energy Physics (JHEP). ISSN 1126-6708. 2018:95, s. 1–60. doi: 10.1007/JHEP03(2018)095. Fulltekst i vitenarkiv Vis sammendrag

  The coupling properties of the Higgs boson are studied in the four-lepton (e, μ) decay channel using 36.1 fb−1 of pp collision data from the LHC at a centre-of-mass energy of 13 TeV collected by the ATLAS detector. Cross sections are measured for the main production modes in several exclusive regions of the Higgs boson production phase space and are interpreted in terms of coupling modifiers. The inclusive cross section times branching ratio for H → ZZ∗ decay and for a Higgs boson absolute rapidity below 2.5 is measured to be 1. 73 − 0.23 + 0.24 (stat.) − 0.08 + 0.10 (exp.) ± 0.04(th.) pb compared to the Standard Model prediction of 1.34±0.09 pb. In addition, the tensor structure of the Higgs boson couplings is studied using an effective Lagrangian approach for the description of interactions beyond the Standard Model. Constraints are placed on the non-Standard-Model CP-even and CP-odd couplings to Z bosons and on the CP-odd coupling to gluons.

• Aaboud, Morad; Aad, Georges; Abbott, Brad; Abdallah, Jalal; Abdinov, Ovsat Bahram oglu & Abeloos, Baptiste [Vis alle 51 forfattere av denne artikkelen] (2018). Measurement of the W-boson mass in pp collisions at s√=7TeV with the ATLAS detector. European Physical Journal C. ISSN 1434-6044. 78:110, s. 1–61. doi: 10.1140/epjc/s10052-017-5475-4. Fulltekst i vitenarkiv Vis sammendrag

  A measurement of the mass of the W boson is presented based on proton–proton collision data recorded in 2011 at a centre-of-mass energy of 7 TeV with the ATLAS detector at the LHC, and corresponding to 4.6 fb−1 of integrated luminosity. The selected data sample consists of 7.8×106 candidates in the 𝑊→𝜇𝜈 channel and 5.9×106 candidates in the 𝑊→𝑒𝜈 channel. The W-boson mass is obtained from template fits to the reconstructed distributions of the charged lepton transverse momentum and of the W boson transverse mass in the electron and muon decay channels, yielding 𝑚𝑊=80370=80370±7 (stat.)±11(exp. syst.)±14 (mod. syst.) MeV±19MeV, where the first uncertainty is statistical, the second corresponds to the experimental systematic uncertainty, and the third to the physics-modelling systematic uncertainty. A measurement of the mass difference between the 𝑊+ and 𝑊− bosons yields 𝑚𝑊+−𝑚𝑊−=−29±28 MeV.

• Aaboud, Morad; Aad, Georges; Abbott, Brad; Abdallah, Jalal; Abdinov, Ovsat Bahram oglu & Abeloos, Baptiste [Vis alle 51 forfattere av denne artikkelen] (2018). Measurement of quarkonium production in proton–lead and proton–proton collisions at 5.02 TeV with the ATLAS detector. European Physical Journal C. ISSN 1434-6044. 78:171, s. 1–32. doi: 10.1140/epjc/s10052-018-5624-4. Fulltekst i vitenarkiv Vis sammendrag

  The modification of the production of 𝐽/𝜓 , 𝜓(2S) , and 𝛶(𝑛S) ( 𝑛=1,2,3 ) in p+Pb collisions with respect to their production in pp collisions has been studied. The p+Pb and pp datasets used in this paper correspond to integrated luminosities of 28 nb−1 and 25 pb−1 respectively, collected in 2013 and 2015 by the ATLAS detector at the LHC, both at a centre-of-mass energy per nucleon pair of 5.02 TeV. The quarkonium states are reconstructed in the dimuon decay channel. The yields of 𝐽/𝜓 and 𝜓(2S) are separated into prompt and non-prompt sources. The measured quarkonium differential cross sections are presented as a function of rapidity and transverse momentum, as is the nuclear modification factor, 𝑅𝑝Pb for 𝐽/𝜓 and 𝛶(𝑛S) . No significant modification of the 𝐽/𝜓 production is observed while 𝛶(𝑛S) production is found to be suppressed at low transverse momentum in p+Pb collisions relative to pp collisions. The production of excited charmonium and bottomonium states is found to be suppressed relative to that of the ground states in central p+Pb collisions.

• Aaboud, Morad; Aad, Georges; Abbott, Brad; Abdinov, Ovsat Bahram oglu; Abeloos, Baptiste & Abidi, Syed Haider [Vis alle 51 forfattere av denne artikkelen] (2018). Measurement of longitudinal flow decorrelations in Pb+Pb collisions at √sNN=2.76 and 5.02 TeV with the ATLAS detector. European Physical Journal C. ISSN 1434-6044. 78:142, s. 1–37. doi: 10.1140/epjc/s10052-018-5605-7. Fulltekst i vitenarkiv Vis sammendrag

  Measurements of longitudinal flow correlations are presented for charged particles in the pseudorapidity range |𝜂|<2.4 using 7 and 470 μb−1 of Pb+Pb collisions at 𝑠NN‾‾‾‾√=2.76 and 5.02 TeV, respectively, recorded by the ATLAS detector at the LHC. It is found that the correlation between the harmonic flow coefficients 𝑣𝑛 measured in two separated 𝜂 intervals does not factorise into the product of single-particle coefficients, and this breaking of factorisation, or flow decorrelation, increases linearly with the 𝜂 separation between the intervals. The flow decorrelation is stronger at 2.76 TeV than at 5.02 TeV. Higher-order moments of the correlations are also measured, and the corresponding linear coefficients for the 𝑘th -moment of the 𝑣𝑛 are found to be proportional to k for 𝑣3 , but not for 𝑣2 . The decorrelation effect is separated into contributions from the magnitude of 𝑣𝑛 and the event-plane orientation, each as a function of 𝜂 . These two contributions are found to be comparable. The longitudinal flow correlations are also measured between 𝑣𝑛 of different order in n. The decorrelations of 𝑣2 and 𝑣3 are found to be independent of each other, while the decorrelations of 𝑣4 and 𝑣5 are found to be driven by the nonlinear contribution from 𝑣22 and 𝑣2𝑣3 , respectively.

• Aaboud, Morad; Aad, Georges; Abbott, Brad; Abdinov, Ovsat Bahram oglu; Abeloos, Baptiste & Abidi, Syed Haider [Vis alle 52 forfattere av denne artikkelen] (2018). Measurement of dijet azimuthal decorrelations in pp collisions at √s=8  TeV with the ATLAS detector and determination of the strong coupling. Physical Review D. ISSN 2470-0010. 98(9), s. 1–31. doi: 10.1103/PhysRevD.98.092004. Fulltekst i vitenarkiv Vis sammendrag

  A measurement of the rapidity and transverse momentum dependence of dijet azimuthal decorrelations is presented, using the quantity RΔϕ. The quantity RΔϕ specifies the fraction of the inclusive dijet events in which the azimuthal opening angle of the two jets with the highest transverse momenta is less than a given value of the parameter Δϕmax. The quantity RΔϕ is measured in proton-proton collisions at √s=8  TeV as a function of the dijet rapidity interval, the event total scalar transverse momentum, and Δϕmax. The measurement uses an event sample corresponding to an integrated luminosity of 20.2  fb−1 collected with the ATLAS detector at the CERN Large Hadron Collider. Predictions of a perturbative QCD calculation at next-to-leading order in the strong coupling with corrections for nonperturbative effects are compared to the data. The theoretical predictions describe the data in the whole kinematic region. The data are used to determine the strong coupling αS and to study its running for momentum transfers from 260 GeV to above 1.6 TeV. Analysis that combines data at all momentum transfers results in αS(mZ)=0.1127+0.0063−0.0027.

• Aaboud, Morad; Aad, Georges; Abbott, Brad; Abdinov, Ovsat Bahram oglu; Abeloos, Baptiste & Abidi, Syed Haider [Vis alle 51 forfattere av denne artikkelen] (2018). Measurements of differential cross sections of top quark pair production in association with jets in pp collisions at √s=13 TeV using the ATLAS detector. Journal of High Energy Physics (JHEP). ISSN 1126-6708. 2018:159(10), s. 1–57. doi: 10.1007/JHEP10(2018)159. Fulltekst i vitenarkiv Vis sammendrag

  Measurements of differential cross sections of top quark pair production in association with jets by the ATLAS experiment at the LHC are presented. The measurements are performed as functions of the top quark transverse momentum, the transverse momentum of the top quark-antitop quark system and the out-of-plane transverse momentum using data from pp collisions at s√=13 TeV collected by the ATLAS detector at the LHC in 2015 and corresponding to an integrated luminosity of 3.2 fb−1. The top quark pair events are selected in the lepton (electron or muon) + jets channel. The measured cross sections, which are compared to several predictions, allow a detailed study of top quark production.

• Aaboud, Morad; Aad, Georges; Abbott, Brad; Abdinov, Ovsat Bahram oglu; Abeloos, Baptiste & Abhayasinghe, Deshan Kavishka [Vis alle 50 forfattere av denne artikkelen] (2018). Performance of missing transverse momentum reconstruction with the ATLAS detector using proton–proton collisions at √s=13 TeV. European Physical Journal C. ISSN 1434-6044. 78:903(11), s. 1–46. doi: 10.1140/epjc/s10052-018-6288-9. Fulltekst i vitenarkiv Vis sammendrag

  The performance of the missing transverse momentum (Emiss T ) reconstruction with the ATLAS detector is evaluated using data collected in proton&ndash;proton collisions at the LHC at a centre-of-mass energy of 13 TeV in 2015. To reconstruct Emiss T , fully calibrated electrons, muons, photons, hadronically decaying &tau; -leptons, and jets reconstructed from calorimeter energy deposits and charged-particle tracks are used. These are combined with the soft hadronic activity measured by reconstructed charged-particle tracks not associated with the hard objects. Possible double counting of contributions from reconstructed charged-particle tracks from the inner detector, energy deposits in the calorimeter, and reconstructed muons from the muon spectrometer is avoided by applying a signal ambiguity resolution procedure which rejects already used signals when combining the various Emiss T contributions. The individual terms as well as the overall reconstructed Emiss T are evaluated with various performance metrics for scale (linearity), resolution, and sensitivity to the data-taking conditions. The method developed to determine the systematic uncertainties of the Emiss T scale and resolution is discussed. Results are shown based on the full 2015 data sample corresponding to an integrated luminosity of 3.2 fb&minus;1.

• Aaboud, Morad; Aad, Georges; Abbott, Brad; Abdinov, Ovsat Bahram oglu; Abeloos, Baptiste & Abidi, Syed Haider [Vis alle 51 forfattere av denne artikkelen] (2018). Angular analysis of B d 0  → K∗μ+μ− decays in pp collisions at √s=8 TeV with the ATLAS detector. Journal of High Energy Physics (JHEP). ISSN 1126-6708. 2018:47, s. 1–46. doi: 10.1007/JHEP10(2018)047. Fulltekst i vitenarkiv Vis sammendrag

  An angular analysis of the decay B_d^0  → K^∗μ^+μ^− is presented, based on proton-proton collision data recorded by the ATLAS experiment at the LHC. The study is using 20.3 fb^−1 of integrated luminosity collected during 2012 at centre-of-mass energy of √s=8 TeV. Measurements of the K* longitudinal polarisation fraction and a set of angular parameters obtained for this decay are presented. The results are compatible with the Standard Model predictions.

• Aaboud, Morad; Aad, Georges; Abbott, Brad; Abdinov, Ovsat Bahram oglu; Abeloos, Baptiste & Abidi, Syed Haider [Vis alle 52 forfattere av denne artikkelen] (2018). Measurement of the cross section for isolated-photon plus jet production in pp collisions at √s = 13 TeV using the ATLAS detector. Physics Letters B. ISSN 0370-2693. 780, s. 578–602. doi: 10.1016/j.physletb.2018.03.035. Fulltekst i vitenarkiv Vis sammendrag

  The dynamics of isolated-photon production in association with a jet in proton–proton collisions at a centre-of-mass energy of 13 TeV are studied with the ATLAS detector at the LHC using a dataset with an integrated luminosity of 3.2 fb−1. Photons are required to have transverse energies above 125 GeV. Jets are identified using the anti- algorithm with radius parameter and required to have transverse momenta above 100 GeV. Measurements of isolated-photon plus jet cross sections are presented as functions of the leading-photon transverse energy, the leading-jet transverse momentum, the azimuthal angular separation between the photon and the jet, the photon–jet invariant mass and the scattering angle in the photon–jet centre-of-mass system. Tree-level plus parton-shower predictions from Sherpa and Pythia as well as next-to-leading-order QCD predictions from Jetphox and Sherpa are compared to the measurements.

• Aaboud, Morad; Aad, Georges; Abbott, Brad; Abdinov, Ovsat Bahram oglu; Abeloos, Baptiste & Abidi, Syed Haider [Vis alle 51 forfattere av denne artikkelen] (2018). A search for pair-produced resonances in four-jet final states at √s=13 TeV with the ATLAS detector. European Physical Journal C. ISSN 1434-6044. 78:250(3), s. 1–28. doi: 10.1140/epjc/s10052-018-5693-4. Fulltekst i vitenarkiv Vis sammendrag

  A search for massive coloured resonances which are pair-produced and decay into two jets is presented. The analysis uses 36.7 fb −1 of s√ = 13 TeV pp collision data recorded by the ATLAS experiment at the LHC in 2015 and 2016. No significant deviation from the background prediction is observed. Results are interpreted in a SUSY simplified model where the lightest supersymmetric particle is the top squark, t~ , which decays promptly into two quarks through R-parity-violating couplings. Top squarks with masses in the range 100 GeV<mt~<410 GeV are excluded at 95% confidence level. If the decay is into a b-quark and a light quark, a dedicated selection requiring two b-tags is used to exclude masses in the ranges 100 GeV<mt~<470 GeV and 480 GeV<mt~<610 GeV . Additional limits are set on the pair-production of massive colour-octet resonances.

• Aaboud, Morad; Aad, Georges; Abbott, Brad; Abdinov, Ovsat Bahram oglu; Abeloos, Baptiste & Abidi, Syed Haider [Vis alle 51 forfattere av denne artikkelen] (2018). A search for resonances decaying into a Higgs boson and a new particle X in the XH → qqbb final state with the ATLAS detector. Physics Letters B. ISSN 0370-2693. 779, s. 24–45. doi: 10.1016/j.physletb.2018.01.042. Fulltekst i vitenarkiv Vis sammendrag

  A search for heavy resonances decaying into a Higgs boson (H) and a new particle (X) is reported, utilizing 36.1 fb^−1 of proton–proton collision data at √s = 13 TeV collected during 2015 and 2016 with the ATLAS detector at the CERN Large Hadron Collider. The particle X is assumed to decay to a pair of light quarks, and the fully hadronic final state XH → qq¯'bb¯ is analysed. The search considers the regime of high XH resonance masses, where the X and H bosons are both highly Lorentz-boosted and are each reconstructed using a single jet with large radius parameter. A two-dimensional phase space of XH mass versus X mass is scanned for evidence of a signal, over a range of XH resonance mass values between 1 TeV and 4 TeV, and for X particles with masses from 50 GeV to 1000 GeV. All search results are consistent with the expectations for the background due to Standard Model processes, and 95% CL upper limits are set, as a function of XH and X masses, on the production cross-section of the XH → qq¯'bb¯ resonance.

• Aaboud, Morad; Aad, Georges; Abbott, Brad; Abdinov, Ovsat Bahram oglu; Abeloos, Baptiste & Abidi, Syed Haider [Vis alle 51 forfattere av denne artikkelen] (2018). Search for electroweak production of supersymmetric particles in final states with two or three leptons at √s=13TeV with the ATLAS detector. European Physical Journal C. ISSN 1434-6044. 78:995(12), s. 1–36. doi: 10.1140/epjc/s10052-018-6423-7. Fulltekst i vitenarkiv
• Aaboud, Morad; Aad, Georges; Abbott, Brad; Abdinov, Ovsat Bahram oglu; Abeloos, Baptiste & Abidi, Syed Haider [Vis alle 51 forfattere av denne artikkelen] (2018). Search for supersymmetry in final states with missing transverse momentum and multiple b-jets in proton-proton collisions at s√=13 TeV with the ATLAS detector. Journal of High Energy Physics (JHEP). ISSN 1126-6708. 2018:107(6), s. 1–58. doi: 10.1007/JHEP06(2018)107. Fulltekst i vitenarkiv Vis sammendrag

  A search for supersymmetry involving the pair production of gluinos decaying via third-generation squarks into the lightest neutralino (𝜒̃ 01) is reported. It uses LHC proton-proton collision data at a centre-of-mass energy 𝑠√=13 TeV with an integrated luminosity of 36.1 fb−1 collected with the ATLAS detector in 2015 and 2016. The search is performed in events containing large missing transverse momentum and several energetic jets, at least three of which must be identified as originating from b-quarks. To increase the sensitivity, the sample is divided into subsamples based on the presence or absence of electrons or muons. No excess is found above the predicted background. For 𝜒̃ 01 masses below approximately 300 GeV, gluino masses of less than 1.97 (1.92) TeV are excluded at 95% confidence level in simplified models involving the pair production of gluinos that decay via top (bottom) squarks. An interpretation of the limits in terms of the branching ratios of the gluinos into third-generation squarks is also provided. These results improve upon the exclusion limits obtained with the 3.2 fb−1 of data collected in 2015.

• Aaboud, Morad; Aad, Georges; Abbott, Brad; Abdinov, Ovsat Bahram oglu; Abeloos, Baptiste & Abidi, Syed Haider [Vis alle 50 forfattere av denne artikkelen] (2018). Measurement of differential cross-sections of a single top quark produced in association with a W boson at s√=13TeV with ATLAS. European Physical Journal C. ISSN 1434-6044. 78:186(3), s. 1–29. doi: 10.1140/epjc/s10052-018-5649-8. Fulltekst i vitenarkiv Vis sammendrag

  The differential cross-section for the production of a W boson in association with a top quark is measured for several particle-level observables. The measurements are performed using 36.1fb^−1 of pp collision data collected with the ATLAS detector at the LHC in 2015 and 2016. Differential cross-sections are measured in a fiducial phase space defined by the presence of two charged leptons and exactly one jet matched to a b-hadron, and are normalised with the fiducial cross-section. Results are found to be in good agreement with predictions from several Monte Carlo event generators.

• Aaboud, Morad; Aad, Georges; Abbott, Brad; Abdinov, Ovsat Bahram oglu; Abeloos, Baptiste & Abidi, Syed Haider [Vis alle 51 forfattere av denne artikkelen] (2018). Measurement of the inclusive and fiducial tt¯ production cross-sections in the lepton+jets channel in pp collisions at √s=8 TeV with the ATLAS detector. European Physical Journal C. ISSN 1434-6044. 78:487, s. 1–31. doi: 10.1140/epjc/s10052-018-5904-z. Fulltekst i vitenarkiv Vis sammendrag

  The inclusive and fiducial 𝑡𝑡¯ production cross-sections are measured in the lepton+jets channel using 20.2 fb−1 of proton–proton collision data at a centre-of-mass energy of 8 TeV recorded with the ATLAS detector at the LHC. Major systematic uncertainties due to the modelling of the jet energy scale and b-tagging efficiency are constrained by separating selected events into three disjoint regions. In order to reduce systematic uncertainties in the most important background, the 𝑊+\,jets process is modelled using 𝑍 + jets events in a data-driven approach. The inclusive 𝑡𝑡¯ cross-section is measured with a precision of 5.7% to be 𝜎inc(𝑡𝑡¯)=248.3±0.7(stat.)±13.4(syst.)±4.7(lumi.) pb , assuming a top-quark mass of 172.5 GeV. The result is in agreement with the Standard Model prediction. The cross-section is also measured in a phase space close to that of the selected data. The fiducial cross-section is 𝜎fid(𝑡𝑡¯)=48.8±0.1(stat.)±2.0(syst.)±0.9(lumi.) pb with a precision of 4.5%.

• Aaboud, Morad; Aad, Georges; Abbott, Brad; Abdinov, Ovsat Bahram oglu; Abeloos, Baptiste & Abidi, Syed Haider [Vis alle 51 forfattere av denne artikkelen] (2018). Measurement of inclusive jet and dijet cross-sections in proton-proton collisions at √s=13 TeV with the ATLAS detector. Journal of High Energy Physics (JHEP). ISSN 1126-6708. 2018:195, s. 1–47. doi: 10.1007/JHEP05(2018)195. Fulltekst i vitenarkiv Vis sammendrag

  Inclusive jet and dijet cross-sections are measured in proton-proton collisions at a centre-of-mass energy of 13 TeV. The measurement uses a dataset with an integrated luminosity of 3.2 fb−1 recorded in 2015 with the ATLAS detector at the Large Hadron Collider. Jets are identified using the anti-kt algorithm with a radius parameter value of R = 0.4. The inclusive jet cross-sections are measured double-differentially as a function of the jet transverse momentum, covering the range from 100 GeV to 3.5 TeV, and the absolute jet rapidity up to |y| = 3. The double-differential dijet production cross-sections are presented as a function of the dijet mass, covering the range from 300 GeV to 9 TeV, and the half absolute rapidity separation between the two leading jets within |y| < 3, y∗, up to y∗ = 3. Next-to-leading-order, and next-to-next-to-leading-order for the inclusive jet measurement, perturbative QCD calculations corrected for non-perturbative and electroweak effects are compared to the measured cross-sections.

• Aaboud, Morad; Aad, Georges; Abbott, Brad; Abdinov, Ovsat Bahram oglu; Abeloos, Baptiste & Abidi, Syed Haider [Vis alle 50 forfattere av denne artikkelen] (2018). Search for heavy resonances decaying into WW in the eνμν final state in pp collisions at s√=13 TeV with the ATLAS detector. European Physical Journal C. ISSN 1434-6044. 78:24, s. 1–34. doi: 10.1140/epjc/s10052-017-5491-4. Fulltekst i vitenarkiv Vis sammendrag

  A search for neutral heavy resonances is performed in the 𝑊𝑊→𝑒𝜈𝜇𝜈 decay channel using pp collision data corresponding to an integrated luminosity of 36.1fb−1 , collected at a centre-of-mass energy of 13 TeV by the ATLAS detector at the Large Hadron Collider. No evidence of such heavy resonances is found. In the search for production via the quark–antiquark annihilation or gluon–gluon fusion process, upper limits on 𝜎𝑋×𝐵(𝑋→𝑊𝑊) as a function of the resonance mass are obtained in the mass range between 200 GeV and up to 5 TeV for various benchmark models: a Higgs-like scalar in different width scenarios, a two-Higgs-doublet model, a heavy vector triplet model, and a warped extra dimensions model. In the vector-boson fusion process, constraints are also obtained on these resonances, as well as on a Higgs boson in the Georgi–Machacek model and a heavy tensor particle coupling only to gauge bosons.

• Aaboud, Morad; Aad, Georges; Abbott, Brad; Abdinov, Ovsat Bahram oglu; Abeloos, Baptiste & Abidi, Syed Haider [Vis alle 51 forfattere av denne artikkelen] (2018). Search for new phenomena in high-mass final states with a photon and a jet from pp collisions at s√ = 13 TeV with the ATLAS detector. European Physical Journal C. ISSN 1434-6044. 78:102, s. 1–25. doi: 10.1140/epjc/s10052-018-5553-2. Fulltekst i vitenarkiv Vis sammendrag

  A search is performed for new phenomena in events having a photon with high transverse momentum and a jet collected in 36.7 fb−1 of proton–proton collisions at a centre-of-mass energy of 𝑠√ = 13 TeV recorded with the ATLAS detector at the Large Hadron Collider. The invariant mass distribution of the leading photon and jet is examined to look for the resonant production of new particles or the presence of new high-mass states beyond the Standard Model. No significant deviation from the background-only hypothesis is observed and cross-section limits for generic Gaussian-shaped resonances are extracted. Excited quarks hypothesized in quark compositeness models and high-mass states predicted in quantum black hole models with extra dimensions are also examined in the analysis. The observed data exclude, at 95% confidence level, the mass range below 5.3 TeV for excited quarks and 7.1 TeV (4.4 TeV) for quantum black holes in the Arkani-Hamed–Dimopoulos–Dvali (Randall–Sundrum) model with six (one) extra dimensions.

• Aaboud, Morad; Aad, Georges; Abbott, Brad; Abdinov, Ovsat Bahram oglu; Abeloos, Baptiste & Abidi, Syed Haider [Vis alle 51 forfattere av denne artikkelen] (2018). Search for long-lived, massive particles in events with displaced vertices and missing transverse momentum in √s=13  TeV pp collisions with the ATLAS detector. Physical Review D. ISSN 2470-0010. 97:052012(5), s. 1–29. doi: 10.1103/PhysRevD.97.052012. Fulltekst i vitenarkiv Vis sammendrag

  A search for long-lived, massive particles predicted by many theories beyond the Standard Model is presented. The search targets final states with large missing transverse momentum and at least one high-mass displaced vertex with five or more tracks, and uses 32.8 fb^−1 of √s=13 TeV pp collision data collected by the ATLAS detector at the LHC. The observed yield is consistent with the expected background. The results are used to extract 95% C.L. exclusion limits on the production of long-lived gluinos with masses up to 2.37 TeV and lifetimes of O(10^−2)−O(10) ns in a simplified model inspired by split supersymmetry.

• Aaboud, Morad; Aad, Georges; Abbott, Brad; Abdinov, Ovsat Bahram oglu; Abeloos, Baptiste & Abidi, Syed Haider [Vis alle 51 forfattere av denne artikkelen] (2018). Search for heavy resonances decaying into a W or Z boson and a Higgs boson in final states with leptons and b-jets in 36 fb−1 of √s=13 TeV pp collisions with the ATLAS detector. Journal of High Energy Physics (JHEP). ISSN 1126-6708. 2018:174, s. 1–53. doi: 10.1007/JHEP03(2018)174. Fulltekst i vitenarkiv Vis sammendrag

  A search is conducted for new resonances decaying into a W or Z boson and a 125 GeV Higgs boson in the 𝜈𝜈⎯⎯⎯𝑏𝑏⎯⎯⎯ , ℓ±𝜈𝑏𝑏⎯⎯⎯ , and ℓ+ℓ−𝑏𝑏⎯⎯⎯ final states, where ℓ± = e± or μ±, in pp collisions at 𝑠√=13 TeV. The data used correspond to a total integrated luminosity of 36.1 fb−1 collected with the ATLAS detector at the Large Hadron Collider during the 2015 and 2016 data-taking periods. The search is conducted by examining the reconstructed invariant or transverse mass distributions of W h and Zh candidates for evidence of a localised excess in the mass range of 220 GeV up to 5 TeV. No significant excess is observed and the results are interpreted in terms of constraints on the production cross-section times branching fraction of heavy W′ and Z′ resonances in heavy-vector-triplet models and the CP-odd scalar boson A in two-Higgs-doublet models. Upper limits are placed at the 95% confidence level and range between 9.0 × 10−4 pb and 7.3 × 10−1 pb depending on the model and mass of the resonance.

• Aaboud, Morad; Aad, Georges; Abbott, Brad; Abdinov, Ovsat Bahram oglu; Abeloos, Baptiste & Abidi, Syed Haider [Vis alle 51 forfattere av denne artikkelen] (2018). Search for B−L R-parity-violating top squarks in √s=13  TeV pp collisions with the ATLAS experiment. Physical Review D. ISSN 2470-0010. 97:032003(3), s. 1–28. doi: 10.1103/PhysRevD.97.032003. Fulltekst i vitenarkiv Vis sammendrag

  A search is presented for the direct pair production of the stop, the supersymmetric partner of the top quark, that decays through an&nbsp;R-parity-violating coupling to a final state with two leptons and two jets, at least one of which is identified as a&nbsp;b-jet. The data set corresponds to an integrated luminosity of&nbsp;36.1&thinsp;&thinsp;fb&minus;1&nbsp;of proton-proton collisions at a center-of-mass energy of&nbsp;&radic;s=13&thinsp;&thinsp;TeV, collected in 2015 and 2016 by the ATLAS detector at the LHC. No significant excess is observed over the Standard Model background, and exclusion limits are set on stop pair production at a 95% confidence level. Lower limits on the stop mass are set between 600&nbsp;GeV and 1.5&nbsp;TeV for branching ratios above 10% for decays to an electron or muon and a&nbsp;b-quark.

• Aaboud, Morad; Aad, Georges; Abbott, Brad; Abdinov, Ovsat Bahram oglu; Abeloos, Baptiste & Abidi, Syed Haider [Vis alle 51 forfattere av denne artikkelen] (2018). Search for squarks and gluinos in final states with jets and missing transverse momentum using 36  fb−1 of √s=13  TeV pp collision data with the ATLAS detector. Physical Review D. ISSN 2470-0010. 97:112001(11), s. 1–47. doi: 10.1103/PhysRevD.97.112001. Fulltekst i vitenarkiv Vis sammendrag

  A search for the supersymmetric partners of quarks and gluons (squarks and gluinos) in final states containing hadronic jets and missing transverse momentum, but no electrons or muons, is presented. The data used in this search were recorded in 2015 and 2016 by the ATLAS experiment in √s=13  TeV proton-proton collisions at the Large Hadron Collider, corresponding to an integrated luminosity of 36.1  fb−1. The results are interpreted in the context of various models where squarks and gluinos are pair produced and the neutralino is the lightest supersymmetric particle. An exclusion limit at the 95% confidence level on the mass of the gluino is set at 2.03 TeV for a simplified model incorporating only a gluino and the lightest neutralino, assuming the lightest neutralino is massless. For a simplified model involving the strong production of mass-degenerate first- and second-generation squarks, squark masses below 1.55 TeV are excluded if the lightest neutralino is massless. These limits substantially extend the region of supersymmetric parameter space previously excluded by searches with the ATLAS detector.

• Aaboud, Morad; Aad, Georges; Abbott, Brad; Abdinov, Ovsat Bahram oglu; Abeloos, Baptiste & Abidi, Syed Haider [Vis alle 51 forfattere av denne artikkelen] (2018). Search for top-squark pair production in final states with one lepton, jets, and missing transverse momentum using 36 fb−1 of √s=13 TeV pp collision data with the ATLAS detector. Journal of High Energy Physics (JHEP). ISSN 1126-6708. 2018:108(6), s. 1–96. doi: 10.1007/JHEP06(2018)108. Fulltekst i vitenarkiv Vis sammendrag

  The results of a search for the direct pair production of top squarks, the supersymmetric partner of the top quark, in final states with one isolated electron or muon, several energetic jets, and missing transverse momentum are reported. The analysis also targets spin-0 mediator models, where the mediator decays into a pair of dark-matter particles and is produced in association with a pair of top quarks. The search uses data from proton-proton collisions delivered by the Large Hadron Collider in 2015 and 2016 at a centre-of-mass energy of 𝑠√=13 TeV and recorded by the ATLAS detector, corresponding to an integrated luminosity of 36 fb−1. A wide range of signal scenarios with different mass-splittings between the top squark, the lightest neutralino and possible intermediate supersymmetric particles are considered, including cases where the W bosons or the top quarks produced in the decay chain are off-shell. No significant excess over the Standard Model prediction is observed. The null results are used to set exclusion limits at 95% confidence level in several supersymmetry benchmark models. For pair-produced top-squarks decaying into top quarks, top-squark masses up to 940 GeV are excluded. Stringent exclusion limits are also derived for all other considered top-squark decay scenarios. For the spin-0 mediator models, upper limits are set on the visible cross-section.

• Aaboud, Morad; Aad, Georges; Abbott, Brad; Abdinov, Ovsat Bahram oglu; Abeloos, Baptiste & Abidi, Syed Haider [Vis alle 51 forfattere av denne artikkelen] (2018). Search for a structure in the B0sπ± invariant mass spectrum with the ATLAS experiment. Physical Review Letters. ISSN 0031-9007. 120:202007, s. 1–19. doi: 10.1103/PhysRevLett.120.202007. Fulltekst i vitenarkiv Vis sammendrag

  A search for the narrow structure, Xð5568Þ, reported by the D0 Collaboration in the decay sequence X → B0 sπ , B0 s → J=ψϕ, is presented. The analysis is based on a data sample recorded with the ATLAS detector at the LHC corresponding to 4.9 fb−1 of pp collisions at 7 TeV and 19.5 fb−1 at 8 TeV. No significant signal was found. Upper limits on the number of signal events, with properties corresponding to those reported by D0, and on the X production rate relative to B0 s mesons, ρX, were determined at 95% confidence level. The results are NðXÞ < 382 and ρX < 0.015 for B0 s mesons with transverse momenta above 10 GeV, and NðXÞ < 356 and ρX < 0.016 for transverse momenta above 15 GeV. Limits are also set for potential B0 sπ resonances in the mass range 5550 to 5700 MeV.

• Aaboud, Morad; Aad, Georges; Abbott, Brad; Abdinov, Ovsat Bahram oglu; Abeloos, Baptiste & Abidi, Syed Haider [Vis alle 51 forfattere av denne artikkelen] (2018). ZZ→ℓ+ℓ−ℓ'+ℓ'− cross-section measurements and search for anomalous triple gauge couplings in 13 TeV pp collisions with the ATLAS detector. Physical Review D. ISSN 2470-0010. 97:032005(3), s. 1–39. doi: 10.1103/PhysRevD.97.032005. Fulltekst i vitenarkiv Vis sammendrag

  Measurements of ZZ production in the lþl−l0þl0− channel in proton–proton collisions at 13 TeV center-of-mass energy at the Large Hadron Collider are presented. The data correspond to 36.1 fb−1 of collisions collected by the ATLAS experiment in 2015 and 2016. Here l and l0 stand for electrons or muons. Integrated and differential ZZ → lþl−l0þl0− cross sections with Z → lþl− candidate masses in the range of 66 GeV to 116 GeV are measured in a fiducial phase space corresponding to the detector acceptance and corrected for detector effects. The differential cross sections are presented in bins of twenty observables, including several that describe the jet activity. The integrated cross section is also extrapolated to a total phase space and to all standard model decays of Z bosons with mass between 66 GeV and 116 GeV, resulting in a value of 17.3 0.9½0.6ðstatÞ 0.5ðsystÞ 0.6ðlumiÞ pb. The measurements are found to be in good agreement with the standard model. A search for neutral triple gauge couplings is performed using the transverse momentum distribution of the leading Z boson candidate. No evidence for such couplings is found and exclusion limits are set on their parameters.

• Aaboud, Morad; Aad, Georges; Abbott, Brad; Abdinov, Ovsat Bahram oglu; Abeloos, Baptiste & Abidi, Syed Haider [Vis alle 51 forfattere av denne artikkelen] (2018). Search for the direct production of charginos and neutralinos in final states with tau leptons in s√=13TeV pp collisions with the ATLAS detector. European Physical Journal C. ISSN 1434-6044. 78:154, s. 1–33. doi: 10.1140/epjc/s10052-018-5583-9. Fulltekst i vitenarkiv Vis sammendrag

  A search for the direct production of charginos and neutralinos in final states with at least two hadronically decaying tau leptons is presented. The analysis uses a dataset of pp collisions corresponding to an integrated luminosity of 36.1 fb−1 , recorded with the ATLAS detector at the Large Hadron Collider at a centre-of-mass energy of 13 TeV. No significant deviation from the expected Standard Model background is observed. Limits are derived in scenarios of χ˜ + 1 χ˜ − 1 pair production and of χ˜ ± 1 χ˜ 0 2 and χ˜ + 1 χ˜ − 1 production in simplified models where the neutralinos and charginos decay solely via intermediate left-handed staus and tau sneutrinos, and the mass of the τ˜L state is set to be halfway between the masses of the χ˜ ± 1 and the χ˜ 0 1 . Chargino masses up to 630 GeV are excluded at 95% confidence level in the scenario of direct production of χ˜ + 1 χ˜ − 1 for a massless χ˜ 0 1 . Common χ˜ ± 1 and χ˜ 0 2 masses up to 760 GeV are excluded in the case of production of χ˜ ± 1 χ˜ 0 2 and χ˜ + 1 χ˜ − 1 assuming a massless χ˜ 0 1 . Exclusion limits for additional benchmark scenarios with large and small mass-splitting between the χ˜ ± 1 and the χ˜ 0 1 are also studied by varying the τ˜L mass between the masses of the χ˜ ± 1 and the χ˜ 0 1 .

• Aaboud, Morad; Aad, Georges; Abbott, Brad; Abdinov, Ovsat Bahram oglu; Abeloos, Baptiste & Abidi, Syed Haider [Vis alle 51 forfattere av denne artikkelen] (2018). Measurement of the soft-drop jet mass in pp collisions at √s=13  TeV with the ATLAS detector. Physical Review Letters. ISSN 0031-9007. 121:092001(9), s. 1–21. doi: 10.1103/PhysRevLett.121.092001. Fulltekst i vitenarkiv Vis sammendrag

  Jet substructure observables have significantly extended the search program for physics beyond the standard model at the Large Hadron Collider. The state-of-the-art tools have been motivated by theoretical calculations, but there has never been a direct comparison between data and calculations of jet substructure observables that are accurate beyond leading-logarithm approximation. Such observables are significant not only for probing the collinear regime of QCD that is largely unexplored at a hadron collider, but also for improving the understanding of jet substructure properties that are used in many studies at the Large Hadron Collider. This Letter documents a measurement of the first jet substructure quantity at a hadron collider to be calculated at next-to-next-to-leading-logarithm accuracy. The normalized, differential cross section is measured as a function of&nbsp;log10&rho;2, where&nbsp;&rho;&nbsp;is the ratio of the soft-drop mass to the ungroomed jet transverse momentum. This quantity is measured in dijet events from&nbsp;32.9&thinsp;&thinsp;fb&minus;1&nbsp;of&nbsp;&radic;s=13&thinsp;&thinsp;TeV&nbsp;proton-proton collisions recorded by the ATLAS detector. The data are unfolded to correct for detector effects and compared to precise QCD calculations and leading-logarithm particle-level Monte&nbsp;Carlo simulations.

• Aaboud, Morad; Aad, Georges; Abbott, Brad; Abdinov, Ovsat Bahram oglu; Abeloos, Baptiste & Abidi, Syed Haider [Vis alle 51 forfattere av denne artikkelen] (2018). Direct top-quark decay width measurement in the tt¯tt¯ lepton+jets channel at s√=8 TeV with the ATLAS experiment. European Physical Journal C. ISSN 1434-6044. 78(2), s. 1–30. doi: 10.1140/epjc/s10052-018-5595-5. Fulltekst i vitenarkiv Vis sammendrag

  This paper presents a direct measurement of the decay width of the top quark using tt¯ events in the lepton+jets final state. The data sample was collected by the ATLAS detector at the LHC in proton–proton collisions at a centre-of-mass energy of 8 TeV and corresponds to an integrated luminosity of 20.2 fb^−1 . The decay width of the top quark is measured using a template fit to distributions of kinematic observables associated with the hadronically and semileptonically decaying top quarks. The result, Γt=1.76±0.33 (stat.) ^+0.79_−0.68 (syst.) GeV for a top-quark mass of 172.5 GeV, is consistent with the prediction of the Standard Model.

• Aaboud, Morad; Aad, Georges; Abbott, Brad; Abdallah, Jalal; Abdinov, Ovsat Bahram oglu & Abeloos, Baptiste [Vis alle 51 forfattere av denne artikkelen] (2018). Measurement of τ polarisation in Z/γ∗→ττ decays in proton–proton collisions at s√=8 TeV with the ATLAS detector. European Physical Journal C. ISSN 1434-6044. 78:163, s. 1–30. doi: 10.1140/epjc/s10052-018-5619-1. Fulltekst i vitenarkiv Vis sammendrag

  This paper presents a measurement of the polarisation of τ leptons produced in Z/γ ∗ → τ τ decays which is performed with a dataset of proton—proton collisions at √s = 8 TeV, corresponding to an integrated luminosity of 20.2 fb−1 recorded with the ATLAS detector at the LHC in 2012. The Z/γ ∗ → τ τ decays are reconstructed from a hadronically decaying τ lepton with a single charged particle in the final state, accompanied by a τ lepton that decays leptonically. The τ polarisation is inferred from the relative fraction of energy carried by charged and neutral hadrons in the hadronic τ decays. The polarisation is measured in a fiducial region that corresponds to the kinematic region accessible to this analysis. The τ polarisation extracted over the full phase space within the Z/γ ∗ mass range of 66 < mZ/γ ∗ < 116 GeV is found to be Pτ = −0.14±0.02(stat)±0.04(syst). It is in agreement with the Standard Model prediction of Pτ = −0.1517 ± 0.0019, which is obtained from the ALPGEN event generator interfaced with the PYTHIA 6 parton shower modelling and the TAUOLA τ decay library.

• Aaboud, Morad; Aad, Georges; Abbott, Brad; Abdinov, Ovsat Bahram oglu; Abeloos, Baptiste & Abidi, Syed Haider [Vis alle 51 forfattere av denne artikkelen] (2018). Measurement of differential cross sections of isolated-photon plus heavy-flavour jet production in pp collisions at √s = 8 TeV using the ATLAS detector. Physics Letters B. ISSN 0370-2693. 776, s. 295–317. doi: 10.1016/j.physletb.2017.11.054. Fulltekst i vitenarkiv Vis sammendrag

  This Letter presents the measurement of differential cross sections of isolated prompt photons produced in association with a b-jet or a c-jet. These final states provide sensitivity to the heavy-flavour content of the proton and aspects related to the modelling of heavy-flavour quarks in perturbative QCD. The measurement uses proton–proton collision data at a centre-of-mass energy of 8 TeV recorded by the ATLAS detector at the LHC in 2012 corresponding to an integrated luminosity of up to 20.2 fb^−1. The differential cross sections are measured for each jet flavour with respect to the transverse energy of the leading photon in two photon pseudorapidity regions: |η^γ | < 1.37 and 1.56 < |η^γ | < 2.37. The measurement covers photon transverse energies 25 < E^γ_T < 400 GeV and 25 < E^γ_T < 350 GeV respectively for the two |η^γ | regions. For each jet flavour, the ratio of the cross sections in the two |ηγ | regions is also measured. The measurement is corrected for detector effects and compared to leading-order and nextto-leading-order perturbative QCD calculations, based on various treatments and assumptions about the heavy-flavour content of the proton. Overall, the predictions agree well with the measurement, but some deviations are observed at high photon transverse energies. The total uncertainty in the measurement ranges between 13% and 66%, while the central γ + b measurement exhibits the smallest uncertainty, ranging from 13% to 27%, which is comparable to the precision of the theoretical predictions

• Aaboud, Morad; Aad, Georges; Abbott, Brad; Abdinov, Ovsat Bahram oglu; Abeloos, Baptiste & Abidi, Syed Haider [Vis alle 51 forfattere av denne artikkelen] (2018). Search for a new heavy gauge-boson resonance decaying into a lepton and missing transverse momentum in 36 fb−1 of pp collisions at s√=13 TeV with the ATLAS experiment. European Physical Journal C. ISSN 1434-6044. 78:401, s. 1–23. doi: 10.1140/epjc/s10052-018-5877-y. Fulltekst i vitenarkiv Vis sammendrag

  The results of a search for new heavy 𝑊′ bosons decaying to an electron or muon and a neutrino using proton–proton collision data at a centre-of-mass energy of 𝑠√ = 13 TeV are presented. The dataset was collected in 2015 and 2016 by the ATLAS experiment at the Large Hadron Collider and corresponds to an integrated luminosity of 36.1 fb −1 . As no excess of events above the Standard Model prediction is observed, the results are used to set upper limits on the 𝑊′ boson cross-section times branching ratio to an electron or muon and a neutrino as a function of the 𝑊′ mass. Assuming a 𝑊′ boson with the same couplings as the Standard Model W boson, 𝑊′ masses below 5.1 TeV are excluded at the 95% confidence level.

• Aaboud, Morad; Aad, Georges; Abbott, Brad; Abdinov, Ovsat Bahram oglu; Abeloos, Baptiste & Abidi, Syed Haider [Vis alle 51 forfattere av denne artikkelen] (2018). Search for long-lived charginos based on a disappearing-track signature in pp collisions at s√=13 TeV with the ATLAS detector. Journal of High Energy Physics (JHEP). ISSN 1126-6708. 2018:22, s. 1–48. doi: 10.1007/JHEP06(2018)022. Fulltekst i vitenarkiv Vis sammendrag

  This paper presents a search for direct electroweak gaugino or gluino pair production with a chargino nearly mass-degenerate with a stable neutralino. It is based on an integrated luminosity of 36.1 fb−1 of pp collisions at √s = 13 TeV collected by the ATLAS experiment at the LHC. The final state of interest is a disappearing track accompanied by at least one jet with high transverse momentum from initial-state radiation or by four jets from the gluino decay chain. The use of short track segments reconstructed from the innermost tracking layers significantly improves the sensitivity to short chargino lifetimes. The results are found to be consistent with Standard Model predictions. Exclusion limits are set at 95% confidence level on the mass of charginos and gluinos for different chargino lifetimes. For a pure wino with a lifetime of about 0.2 ns, chargino masses up to 460 GeV are excluded. For the strong production channel, gluino masses up to 1.65 TeV are excluded assuming a chargino mass of 460 GeV and lifetime of 0.2 ns.

• Aaboud, Morad; Aad, Georges; Abbott, Brad; Abdinov, Ovsat Bahram oglu; Abeloos, Baptiste & Abidi, Syed Haider [Vis alle 51 forfattere av denne artikkelen] (2018). Measurement of differential cross sections and W+/W− cross-section ratios for W boson production in association with jets at s√=8 TeV with the ATLAS detector. Journal of High Energy Physics (JHEP). ISSN 1126-6708. 2018:77, s. 1–60. doi: 10.1007/JHEP05(2018)077. Fulltekst i vitenarkiv Vis sammendrag

  This paper presents a measurement of the W boson production cross section and the W +/W − cross-section ratio, both in association with jets, in proton-proton collisions at 𝑠√=8 TeV with the ATLAS experiment at the Large Hadron Collider. The measurement is performed in final states containing one electron and missing transverse momentum using data corresponding to an integrated luminosity of 20.2 fb−1. Differential cross sections for events with at least one or two jets are presented for a range of observables, including jet transverse momenta and rapidities, the scalar sum of transverse momenta of the visible particles and the missing transverse momentum in the event, and the transverse momentum of the W boson. For a subset of the observables, the differential cross sections of positively and negatively charged W bosons are measured separately. In the cross-section ratio of W +/W − the dominant systematic uncertainties cancel out, improving the measurement precision by up to a factor of nine. The observables and ratios selected for this paper provide valuable input for the up quark, down quark, and gluon parton distribution functions of the proton.

• Aaboud, Morad; Aad, Georges; Abbott, Brad; Abdinov, Ovsat Bahram oglu; Abeloos, Baptiste & Abidi, Syed Haider [Vis alle 51 forfattere av denne artikkelen] (2018). Search for heavy ZZ resonances in the ℓ+ℓ−ℓ+ℓ− and ℓ+ℓ−νν¯ final states using proton–proton collisions at s√=13 TeV with the ATLAS detector. European Physical Journal C. ISSN 1434-6044. 78:293, s. 1–34. doi: 10.1140/epjc/s10052-018-5686-3. Fulltekst i vitenarkiv Vis sammendrag

  A search for heavy resonances decaying into a pair of Z bosons leading to ℓ+ℓ−ℓ+ℓ− and ℓ+ℓ−νν¯ final states, where ℓ stands for either an electron or a muon, is presented. The search uses proton–proton collision data at a centre-of-mass energy of 13 TeV corresponding to an integrated luminosity of 36.1 fb−1 collected with the ATLAS detector during 2015 and 2016 at the Large Hadron Collider. Different mass ranges for the hypothetical resonances are considered, depending on the final state and model. The different ranges span between 200 and 2000 GeV . The results are interpreted as upper limits on the production cross section of a spin-0 or spin-2 resonance. The upper limits for the spin-0 resonance are translated to exclusion contours in the context of Type-I and Type-II two-Higgs-doublet models, while those for the spin-2 resonance are used to constrain the Randall–Sundrum model with an extra dimension giving rise to spin-2 graviton excitations.

• Aaboud, Morad; Aad, Georges; Abbott, Brad; Abdinov, Ovsat Bahram oglu; Abeloos, Baptiste & Abidi, Syed Haider [Vis alle 51 forfattere av denne artikkelen] (2018). Measurement of long-range multiparticle azimuthal correlations with the subevent cumulant method in pp and p +Pb collisions with the ATLAS detector at the CERN Large Hadron Collider. Physical Review C. ISSN 2469-9985. 97:024904(2), s. 1–25. doi: 10.1103/PhysRevC.97.024904. Fulltekst i vitenarkiv Vis sammendrag

  A detailed study of multiparticle azimuthal correlations is presented using ppdata at √s=5.02 and 13 TeV, and p+Pb data at √sNN=5.02 TeV, recorded with the ATLAS detector at the CERN Large Hadron Collider. The azimuthal correlations are probed using four-particle cumulants c_n{4} and flow coefficients v_n{4}=(−c_n{4})^1/4 for n=2 and 3, with the goal of extracting long-range multiparticle azimuthal correlation signals and suppressing the short-range correlations. The values of c_n{4} are obtained as a function of the average number of charged particles per event, ⟨N_ch⟩, using the recently proposed two-subevent and three-subevent cumulant methods, and compared with results obtained with the standard cumulant method. The standard method is found to be strongly biased by short-range correlations, which originate mostly from jets with a positive contribution to c_n{4}. The three-subevent method, on the other hand, is found to be least sensitive to short-range correlations. The three-subevent method gives a negative c_2{4}, and therefore a well-defined v_2{4}, nearly independent of ⟨N_ch⟩, which implies that the long-range multiparticle azimuthal correlations persist to events with low multiplicity. Furthermore, v_2{4} is found to be smaller than the v_2{2} measured using the two-particle correlation method, as expected for long-range collective behavior. Finally, the measured values of v_2{4} and v_2{2} are used to estimate the number of sources relevant for the initial eccentricity in the collision geometry. The results based on the subevent cumulant technique provide direct evidence, in small collision systems, for a long-range collectivity involving many particles distributed across a broad rapidity interval.

• Aaboud, Morad; Aad, Georges; Abbott, Brad; Abdinov, Ovsat Bahram oglu; Abeloos, Baptiste & Abidi, Syed Haider [Vis alle 51 forfattere av denne artikkelen] (2018). Measurements of t¯t differential cross-sections of highly boosted top quarks decaying to all-hadronic final states in pp collisions at √s=13  TeV using the ATLAS detector. Physical Review D. ISSN 2470-0010. 98:012003, s. 1–39. doi: 10.1103/PhysRevD.98.012003. Fulltekst i vitenarkiv Vis sammendrag

  Measurements are made of differential cross-sections of highly boosted pair-produced top quarks as a function of top-quark and tt system kinematic observables using proton-proton collisions at a center-of-mass energy of √s=13 TeV. The data set corresponds to an integrated luminosity of 36.1  fb−1, recorded in 2015 and 2016 with the ATLAS detector at the CERN Large Hadron Collider. Events with two large-radius jets in the final state, one with transverse momentum pT>500  GeV and a second with pT>350  GeV, are used for the measurement. The top-quark candidates are separated from the multijet background using jet substructure information and association with a b-tagged jet. The measured spectra are corrected for detector effects to a particle-level fiducial phase space and a parton-level limited phase space, and are compared to several Monte Carlo simulations by means of calculated χ2 values. The cross-section for t¯t production in the fiducial phase-space region is 292±7(stat)±71(syst)  fb, to be compared to the theoretical prediction of 384±36  fb.

• Aaboud, Morad; Aad, Georges; Abbott, Brad; Abdallah, Jalal; Abdinov, Ovsat Bahram oglu & Abeloos, Baptiste [Vis alle 51 forfattere av denne artikkelen] (2018). Measurement of jet fragmentation in 5.02 TeV proton–lead and proton–proton collisions with the ATLAS detector. Nuclear Physics A. ISSN 0375-9474. 978, s. 65–106. doi: 10.1016/j.nuclphysa.2018.07.006. Fulltekst i vitenarkiv Vis sammendrag

  A measurement of the fragmentation functions of jets into charged particles in collisions and pp collisions is presented. The analysis utilizes 28 nb−1 of data and 26 pb−1 of pp data, both at = 5.02 TeV, collected in 2013 and 2015, respectively, with the ATLAS detector at the LHC. The measurement is reported in the centre-of-mass frame of the nucleon–nucleon system for jets in the rapidity range ⁎ 1.6 and with transverse momentum 45 260 GeV. Results are presented both as a function of the charged-particle transverse momentum and as a function of the longitudinal momentum fraction of the particle with respect to the jet. The pp fragmentation functions are compared with results from Monte Carlo event generators and two theoretical models. The ratios of the to pp fragmentation functions are found to be consistent with unity.

• Aaboud, Morad; Aad, Georges; Abbott, Brad; Abdinov, Ovsat Bahram oglu; Abeloos, Baptiste & Abidi, Syed Haider [Vis alle 51 forfattere av denne artikkelen] (2018). Search for supersymmetry in events with four or more leptons in √s=13  TeV pp collisions with ATLAS. Physical Review D. ISSN 2470-0010. 98:032009(3), s. 1–31. doi: 10.1103/PhysRevD.98.032009. Fulltekst i vitenarkiv Vis sammendrag

  Results from a search for supersymmetry in events with four or more charged leptons (electrons, muons and taus) are presented. The analysis uses a data sample corresponding to 36.1  fb−1 of proton–proton collisions delivered by the Large Hadron Collider at √s=13  TeV and recorded by the ATLAS detector. Four-lepton signal regions with up to two hadronically decaying taus are designed to target a range of supersymmetric scenarios that can be either enriched in or depleted of events involving the production and decay of a Z boson. Data yields are consistent with Standard Model expectations and results are used to set upper limits on the event yields from processes beyond the Standard Model. Exclusion limits are set at the 95% confidence level in simplified models of general gauge mediated supersymmetry, where Higgsino masses are excluded up to 295 GeV. In R-parity-violating simplified models with decays of the lightest supersymmetric particle to charged leptons, lower limits of 1.46, 1.06, and 2.25 TeV are placed on wino, slepton and gluino masses, respectively.

• Aaboud, Morad; Aad, Georges; Abbott, Brad; Abdinov, Ovsat Bahram oglu; Abeloos, Baptiste & Abidi, Syed Haider [Vis alle 51 forfattere av denne artikkelen] (2018). Search for W W/W Z resonance production in ℓνqq final states in pp collisions at s√=13 TeV with the ATLAS detector. Journal of High Energy Physics (JHEP). ISSN 1126-6708. 2018:3, s. 1–44. doi: 10.1007/JHEP03(2018)042. Fulltekst i vitenarkiv Vis sammendrag

  A search is conducted for new resonances decaying into a W W or W Z boson pair, where one W boson decays leptonically and the other W or Z boson decays hadronically. It is based on proton-proton collision data with an integrated luminosity of 36.1 fb−1 collected with the ATLAS detector at the Large Hadron Collider at a centre-of-mass energy of 𝑠√=13 TeV in 2015 and 2016. The search is sensitive to diboson resonance production via vector-boson fusion as well as quark-antiquark annihilation and gluon-gluon fusion mechanisms. No significant excess of events is observed with respect to the Standard Model backgrounds. Several benchmark models are used to interpret the results. Limits on the production cross section are set for a new narrow scalar resonance, a new heavy vector-boson and a spin-2 Kaluza-Klein graviton.

• Aaboud, Morad; Aad, Georges; Abbott, Brad; Abdinov, Ovsat Bahram oglu; Abeloos, Baptiste & Abidi, Syed Haider [Vis alle 51 forfattere av denne artikkelen] (2018). Search for doubly charged Higgs boson production in multi-lepton final states with the ATLAS detector using proton–proton collisions at s√=13TeV. European Physical Journal C. ISSN 1434-6044. 78:199, s. 1–34. doi: 10.1140/epjc/s10052-018-5661-z. Fulltekst i vitenarkiv Vis sammendrag

  A search for doubly charged Higgs bosons with pairs of prompt, isolated, highly energetic leptons with the same electric charge is presented. The search uses a proton–proton collision data sample at a centre-of-mass energy of 13 TeV corresponding to 36.1 fb^−1 of integrated luminosity recorded in 2015 and 2016 by the ATLAS detector at the LHC. This analysis focuses on the decays H±±→e±e± , H±±→e±μ± and H±±→μ±μ± , fitting the dilepton mass spectra in several exclusive signal regions. No significant evidence of a signal is observed and corresponding limits on the production cross-section and consequently a lower limit on m(H±±) are derived at 95% confidence level. With ℓ±ℓ±=e±e±/μ±μ±/e±μ± , the observed lower limit on the mass of a doubly charged Higgs boson only coupling to left-handed leptons varies from 770 to 870 GeV (850 GeV expected) for B(H±±→ℓ±ℓ±)=100% and both the expected and observed mass limits are above 450 GeV for B(H±±→ℓ±ℓ±)=10% and any combination of partial branching ratios.

• Aaboud, Morad; Aad, Georges; Abbott, Brad; Abdinov, Ovsat Bahram oglu; Abeloos, Baptiste & Abidi, Syed Haider [Vis alle 51 forfattere av denne artikkelen] (2018). Search for diboson resonances with boson-tagged jets in pp collisions at √s = 13 TeV with the ATLAS detector. Physics Letters B. ISSN 0370-2693. 777, s. 91–113. doi: 10.1016/j.physletb.2017.12.011. Fulltekst i vitenarkiv Vis sammendrag

  Narrow resonances decaying into WW, WZ or ZZ boson pairs are searched for in 36.7 fb−1 of proton–proton collision data at a centre-of-mass energy of recorded with the ATLAS detector at the Large Hadron Collider in 2015 and 2016. The diboson system is reconstructed using pairs of large-radius jets with high transverse momentum and tagged as compatible with the hadronic decay of high-momentum W or Z bosons, using jet mass and substructure properties. The search is sensitive to diboson resonances with masses in the range 1.2–5.0 TeV. No significant excess is observed in any signal region. Exclusion limits are set at the 95% confidence level on the production cross section times branching ratio to dibosons for a range of theories beyond the Standard Model. Model-dependent lower limits on the mass of new gauge bosons are set, with the highest limit set at 3.5 TeV in the context of mass-degenerate resonances that couple predominantly to bosons.

• Aaboud, Morad; Aad, Georges; Abbott, Brad; Abdinov, Ovsat Bahram oglu; Abeloos, Baptiste & Abidi, Syed Haider [Vis alle 51 forfattere av denne artikkelen] (2018). Searches for heavy ZZ and ZW resonances in the ℓℓqq and ννqq final states in pp collisions at s√=13 TeV with the ATLAS detector. Journal of High Energy Physics (JHEP). ISSN 1126-6708. 2018:9, s. 1–52. doi: 10.1007/JHEP03(2018)009. Fulltekst i vitenarkiv Vis sammendrag

  This paper reports searches for heavy resonances decaying into ZZ or ZW using data from proton-proton collisions at a centre-of-mass energy of √s=13 TeV. The data, corresponding to an integrated luminosity of 36.1 fb^−1, were recorded with the ATLAS detector in 2015 and 2016 at the Large Hadron Collider. The searches are performed in final states in which one Z boson decays into either a pair of light charged leptons (electrons and muons) or a pair of neutrinos, and the associated W boson or the other Z boson decays hadronically. No evidence of the production of heavy resonances is observed. Upper bounds on the production cross sections of heavy resonances times their decay branching ratios to ZZ or ZW are derived in the mass range 300-5000GeV within the context of Standard Model extensions with additional Higgs bosons, a heavy vector triplet or warped extra dimensions. Production through gluon-gluon fusion, Drell-Yan or vector-boson fusion are considered, depending on the assumed model.

• Aaboud, Morad; Aad, Georges; Abbott, Brad; Abdinov, Ovsat Bahram oglu; Abeloos, Baptiste & Abidi, Syed Haider [Vis alle 51 forfattere av denne artikkelen] (2018). Search for an invisibly decaying Higgs boson or dark matter candidates produced in association with a Z boson in pp collisions at √s =13 TeV with the ATLAS detector. Nuclear Physics B. ISSN 0550-3213. 776, s. 318–337. doi: 10.1016/j.physletb.2017.11.049. Fulltekst i vitenarkiv Vis sammendrag

  A search for an invisibly decaying Higgs boson or dark matter candidates produced in association with a leptonically decaying Z boson in proton–proton collisions at √s = 13 TeV is presented. This search uses 36.1 fb−1 of data collected by the ATLAS experiment at the Large Hadron Collider. No significant deviation from the expectation of the Standard Model backgrounds is observed. Assuming the Standard Model Z H production cross-section, an observed (expected) upper limit of 67% (39%) at the 95% confidence level is set on the branching ratio of invisible decays of the Higgs boson with mass mH = 125 GeV. The corresponding limits on the production cross-section of the Z H process with the invisible Higgs boson decays are also presented. Furthermore, exclusion limits on the dark matter candidate and mediator masses are reported in the framework of simplified dark matter models.

• Aaboud, Morad; Aad, Georges; Abbott, Brad; Abdinov, Ovsat Bahram oglu; Abeloos, Baptiste & Abidi, Syed Haider [Vis alle 51 forfattere av denne artikkelen] (2018). Search for dark matter produced in association with bottom or top quarks in s√=13 TeV pp collisions with the ATLAS detector. European Physical Journal C. ISSN 1434-6044. 78:18, s. 1–36. doi: 10.1140/epjc/s10052-017-5486-1. Fulltekst i vitenarkiv Vis sammendrag

  A search for weakly interacting massive dark-matter particles produced in association with bottom or top quarks is presented. Final states containing third-generation quarks and missing transverse momentum are considered. The analysis uses 36.1 fb^−1 of proton–proton collision data recorded by the ATLAS experiment at √s=13 TeV in 2015 and 2016. No significant excess of events above the estimated backgrounds is observed. The results are interpreted in the framework of simplified models of spin-0 dark-matter mediators. For colour-neutral spin-0 mediators produced in association with top quarks and decaying into a pair of dark-matter particles, mediator masses below 50 GeV are excluded assuming a dark-matter candidate mass of 1 GeV and unitary couplings. For scalar and pseudoscalar mediators produced in association with bottom quarks, the search sets limits on the production cross-section of 300 times the predicted rate for mediators with masses between 10 and 50GeV and assuming a dark-matter mass of 1GeV and unitary coupling. Constraints on colour-charged scalar simplified models are also presented. Assuming a dark-matter particle mass of 35GeV , mediator particles with mass below 1.1TeV are excluded for couplings yielding a dark-matter relic density consistent with measurements.

• Aaboud, Morad; Aad, Georges; Abbott, Brad; Abdinov, Ovsat Bahram oglu; Abeloos, Baptiste & Abidi, Syed Haider [Vis alle 51 forfattere av denne artikkelen] (2018). Search for additional heavy neutral Higgs and gauge bosons in the ditau final state produced in 36 fb−1 of pp collisions at s√=13 TeV with the ATLAS detector. Journal of High Energy Physics (JHEP). ISSN 1126-6708. 2018:55, s. 1–53. doi: 10.1007/JHEP01(2018)055. Fulltekst i vitenarkiv Vis sammendrag

  A search for heavy neutral Higgs bosons and Z′ bosons is performed using a data sample corresponding to an integrated luminosity of 36.1 fb^−1 from proton-proton collisions at √s=13 TeV recorded by the ATLAS detector at the LHC during 2015 and 2016. The heavy resonance is assumed to decay to τ^+τ^− with at least one tau lepton decaying to final states with hadrons and a neutrino. The search is performed in the mass range of 0.2-2.25 TeV for Higgs bosons and 0.2-4.0 TeV for Z′ bosons. The data are in good agreement with the background predicted by the Standard Model. The results are interpreted in benchmark scenarios. In the context of the hMSSM scenario, the data exclude tan β > 1.0 for m_A = 0.25 TeV and tan β > 42 for m_A = 1.5 TeV at the 95% confidence level. For the Sequential Standard Model, Z_[SSM] ′ with m_Z′ < 2.42 TeV is excluded at 95% confidence level, while Z_[NU] ′ with m_Z ′ < 2.25 TeV is excluded for the non-universal G(221) model that exhibits enhanced couplings to third-generation fermions.

• Aaboud, Morad; Aad, Georges; Abbott, Brad; Abdinov, Ovsat Bahram oglu; Abeloos, Baptiste & AbouZeid, Hass [Vis alle 51 forfattere av denne artikkelen] (2018). Search for dark matter and other new phenomena in events with an energetic jet and large missing transverse momentum using the ATLAS detector. Journal of High Energy Physics (JHEP). ISSN 1126-6708. 2018:126, s. 1–52. doi: 10.1007/JHEP01(2018)126. Fulltekst i vitenarkiv Vis sammendrag

  Results of a search for new phenomena in final states with an energetic jet and large missing transverse momentum are reported. The search uses proton-proton collision data corresponding to an integrated luminosity of 36.1 fb−1 at a centre-of-mass energy of 13 TeV collected in 2015 and 2016 with the ATLAS detector at the Large Hadron Collider. Events are required to have at least one jet with a transverse momentum above 250 GeV and no leptons (e or μ). Several signal regions are considered with increasing requirements on the missing transverse momentum above 250 GeV. Good agreement is observed between the number of events in data and Standard Model predictions. The results are translated into exclusion limits in models with pair-produced weakly interacting dark-matter candidates, large extra spatial dimensions, and supersymmetric particles in several compressed scenarios.

• Aaboud, Morad; Aad, Georges; Abbott, Brad; Abdinov, Ovsat Bahram oglu; Abeloos, Baptiste & Abidi, Syed Haider [Vis alle 51 forfattere av denne artikkelen] (2017). Measurement of the cross-section for electroweak production of dijets in association with a Z boson in pp collisions at √s=13 TeV with the ATLAS detector. Physics Letters B. ISSN 0370-2693. 775, s. 206–228. doi: 10.1016/j.physletb.2017.10.040. Fulltekst i vitenarkiv
• Aaboud, M.; Aad, G.; Abbott, B.; Abdallah, J.; Abdinov, O. & Abeloos, B. [Vis alle 2 858 forfattere av denne artikkelen] (2017). Measurement of the k <inf>t</inf> splitting scales in Z → ℓℓ events in pp collisions at √s=8 TeV with the ATLAS detector. Journal of High Energy Physics (JHEP). ISSN 1126-6708. 2017(8). doi: 10.1007/JHEP08(2017)026. Fulltekst i vitenarkiv
• Aaboud, M.; Aad, G.; Abbott, B.; Abdallah, J.; Abdinov, O. & Abeloos, B. [Vis alle 2 852 forfattere av denne artikkelen] (2017). Measurement of the inclusive jet cross-sections in proton-proton collisions at √s=8 TeV with the ATLAS detector. Journal of High Energy Physics (JHEP). ISSN 1126-6708. 2017(9). doi: 10.1007/JHEP09(2017)020. Fulltekst i vitenarkiv
• Aaboud, M.; Aad, G.; Abbott, B.; Abdinov, O.; Abeloos, B. & Abidi, S.H. [Vis alle 2 871 forfattere av denne artikkelen] (2017). Search for pair production of vector-like top quarks in events with one lepton, jets, and missing transverse momentum in √s=13 TeV pp collisions with the ATLAS detector. Journal of High Energy Physics (JHEP). ISSN 1126-6708. 2017(8). doi: 10.1007/JHEP08(2017)052. Fulltekst i vitenarkiv
• Aaboud, Morad; Aad, Georges; Abbott, Brad; Abdallah, Jalal; Abdinov, Ovsat Bahram oglu & Abeloos, Baptiste [Vis alle 53 forfattere av denne artikkelen] (2017). Measurement of forward-backward multiplicity correlations in lead-lead, proton-lead, and proton-proton collisions with the ATLAS detector. Physical Review C. ISSN 2469-9985. 95(6). doi: 10.1103/PhysRevC.95.064914. Fulltekst i vitenarkiv Vis sammendrag

  Two-particle pseudorapidity correlations are measured in \(\sqrt{s_{\rm{NN}}}\) = 2.76 TeV Pb+Pb, \(\sqrt{s_{\rm{NN}}}\) = 5.02 TeV \(p\)+Pb, and \(\sqrt{s}\) = 13 TeV \(pp\) collisions at the LHC, with total integrated luminosities of approximately 7 \(\mu\mathrm{b}^{-1}\), 28 \(\mathrm{nb}^{-1}\), and 65 \(\mathrm{nb}^{-1}\), respectively. The correlation function \(C_{\rm N}(\eta_1,\eta_2)\) is measured as a function of event multiplicity using charged particles in the pseudorapidity range \(|\eta|<2.4\), The correlation function contains a significant short-range component, which is estimated and subtracted. After removal of the short-range component, the shape of the correlation function is described approximately by \(1+\langle{a_1^2}\rangle \eta_1\eta_2\) in all collision systems over the full multiplicity range. The values of \(\sqrt{\langle{a_1^2}\rangle}\) are consistent between the opposite-charge pairs and same-charge pairs, and for the three collision systems at similar multiplicity. The values of \(\sqrt{\langle{a_1^2}\rangle}\) and the magnitude of the short-range component both follow a power-law dependence on the event multiplicity. The \(\eta\) distribution of the short-range component, after symmetrizing the proton and lead directions in \(p\)+Pb collisions, is found to be smaller than that in \(pp\) collisions with comparable multiplicity.

• Aaboud, Morad; Aad, Georges; Abbott, Brad; Abdallah, Jalal; Abdinov, Ovsat Bahram oglu & Abeloos, Baptiste [Vis alle 49 forfattere av denne artikkelen] (2017). Measurement of the cross section for inclusive isolated-photon production in pp collisions at √s=13 TeV using the ATLAS detector. Physics Letters B. ISSN 0370-2693. 770, s. 473–493. doi: 10.1016/j.physletb.2017.04.072. Fulltekst i vitenarkiv
• Aaboud, Morad; Aad, Georges; Abbott, Brad; Abdallah, Jalal; Abdinov, Ovsat Bahram oglu & Abeloos, Baptiste [Vis alle 52 forfattere av denne artikkelen] (2017). Measurements of long-range azimuthal anisotropies and associated Fourier coefficients for pp collisions at √s=5.02 and 13 TeV and p+Pb collisions at √sNN=5.02 TeV with the ATLAS detector. Physical Review C. ISSN 2469-9985. 96(2). doi: 10.1103/PhysRevC.96.024908. Fulltekst i vitenarkiv
• Aaboud, M.; Aad, G.; Abbott, B.; Abdallah, J.; Abdinov, O. & Abeloos, B. [Vis alle 2 860 forfattere av denne artikkelen] (2017). Measurements of ψ(2S) and X(3872) → J/ψπ ⁺ π ⁻ production in pp collisions at √s=8 TeV with the ATLAS detector. Journal of High Energy Physics (JHEP). ISSN 1126-6708. 2017(1). doi: 10.1007/JHEP01(2017)117. Fulltekst i vitenarkiv
• Aaboud, M.; Aad, G.; Abbott, B.; Abdallah, J.; Abdinov, O. & Abeloos, B. [Vis alle 2 854 forfattere av denne artikkelen] (2017). Measurement of the ZZ production cross section in proton-proton collisions at √s=8 TeV using the ZZ → ℓ⁻ℓ⁺ℓ^′−ℓ^′+ and ZZ→ ℓ⁻ℓ⁺νν¯ decay channels with the ATLAS detector. Journal of High Energy Physics (JHEP). ISSN 1126-6708. 2017(1). doi: 10.1007/JHEP01(2017)099. Fulltekst i vitenarkiv
• Aaboud, M.; Aad, G.; Abbott, B.; Abdallah, J.; Abdinov, O. & Abeloos, B. [Vis alle 2 856 forfattere av denne artikkelen] (2017). Measurements of charge and CP asymmetries in b-hadron decays using top-quark events collected by the ATLAS detector in pp collisions at √s=8 TeV. Journal of High Energy Physics (JHEP). ISSN 1126-6708. 2017(2). doi: 10.1007/JHEP02(2017)071. Fulltekst i vitenarkiv
• Aaboud, M.; Aad, G.; Abbott, B.; Abdallah, J.; Abdinov, O. & Abeloos, B. [Vis alle 2 851 forfattere av denne artikkelen] (2017). Measurements of top quark spin observables in tt¯ events using dilepton final states in √s=8 TeV pp collisions with the ATLAS detector. Journal of High Energy Physics (JHEP). ISSN 1126-6708. 2017(3). doi: 10.1007/JHEP03(2017)113. Fulltekst i vitenarkiv
• Aaboud, Morad; Aad, Georges; Abbott, Brad; Abdinov, Ovsat Bahram oglu; Abeloos, Baptiste & Abidi, Syed Haider [Vis alle 51 forfattere av denne artikkelen] (2017). Search for heavy resonances decaying to a W or Z boson and a Higgs boson in the q¯q(')b¯b final state in pp collisions at √s=13 TeV with the ATLAS detector. Physics Letters B. ISSN 0370-2693. 774, s. 494–515. doi: 10.1016/j.physletb.2017.09.066. Fulltekst i vitenarkiv
• Aaboud, Morad; Aad, Georges; Abbott, Brad; Abdinov, Ovsat Bahram oglu; Abeloos, Baptiste & Abidi, Syed Haider [Vis alle 51 forfattere av denne artikkelen] (2017). Search for new phenomena in high-mass diphoton final states using 37fb−1 of proton–proton collisions collected at √s=13 TeV with the ATLAS detector. Physics Letters B. ISSN 0370-2693. 775, s. 105–125. doi: 10.1016/j.physletb.2017.10.039. Fulltekst i vitenarkiv
• Aaboud, Morad; Aad, Georges; Abbott, Brad; Abdinov, Ovsat Bahram oglu; Abeloos, Baptiste & Abidi, Syed Haider [Vis alle 51 forfattere av denne artikkelen] (2017). Search for heavy Higgs bosons A/H decaying to a top quark pair in pp collisions at √s =8 TeV with the ATLAS detector. Physical Review Letters. ISSN 0031-9007. 119:191803(19), s. 1–20. doi: 10.1103/PhysRevLett.119.191803. Fulltekst i vitenarkiv
• Aaboud, Morad; Aad, Georges; Abbott, Brad; Abdinov, Ovsat Bahram oglu; Abeloos, Baptiste & Abidi, Syed Haider [Vis alle 51 forfattere av denne artikkelen] (2017). Search for dark matter produced in association with a Higgs boson decaying to bb using 36 fb-1 of pp collisions at √s =13 TeV with the ATLAS detector. Physical Review Letters. ISSN 0031-9007. 119:181804(18), s. 1–21. doi: 10.1103/PhysRevLett.119.181804. Fulltekst i vitenarkiv
• Aaboud, Morad; Aad, Georges; Abbott, Brad; Abdallah, Jalal; Abdinov, Ovsat Bahram oglu & Abeloos, Baptiste [Vis alle 51 forfattere av denne artikkelen] (2017). Measurement of the W+W−production cross section in ppcollisions at a centre-of-mass energy of √s=13TeV with the ATLAS experiment. Physics Letters B. ISSN 0370-2693. 773, s. 354–374. doi: 10.1016/j.physletb.2017.08.047. Fulltekst i vitenarkiv
• Aaboud, Morad; Aad, Georges; Abbott, Brad; Abdallah, Jalal; Abdinov, Ovsat Bahram oglu & Abeloos, Baptiste [Vis alle 51 forfattere av denne artikkelen] (2017). Jet energy scale measurements and their systematic uncertainties in proton-proton collisions at √s =13 TeV with the ATLAS detector. Physical Review D. ISSN 2470-0010. 96(7). doi: 10.1103/PhysRevD.96.072002. Fulltekst i vitenarkiv
• Aaboud, Morad; Aad, Georges; Abbott, Brad; Abdallah, J; Abdinov, Ovsat Bahram oglu & Abeloos, Baptiste [Vis alle 51 forfattere av denne artikkelen] (2017). Measurement of the t t production cross section in the τ+jets final state in pp collisions at √s =8 TeV using the ATLAS detector. Physical Review D. ISSN 2470-0010. 95(7). doi: 10.1103/PhysRevD.95.072003. Fulltekst i vitenarkiv
• Aaboud, Morad; Aad, Georges; Abbott, Brad; Abdallah, Jalal; Abdinov, Ovsat Bahram oglu & Abeloos, Baptiste [Vis alle 51 forfattere av denne artikkelen] (2017). Performance of the ATLAS track reconstruction algorithms in dense environments in LHC Run 2. European Physical Journal C. ISSN 1434-6044. 77:673(10), s. 1–30. doi: 10.1140/epjc/s10052-017-5225-7. Fulltekst i vitenarkiv
• Aaboud, Morad; Aad, Georges; Abbott, Brad; Abdallah, Jalal; Abdinov, Ovsat Bahram oglu & Abeloos, Baptiste [Vis alle 51 forfattere av denne artikkelen] (2017). Measurement of W±W± vector-boson scattering and limits on anomalous quartic gauge couplings with the ATLAS detector. Physical Review D. ISSN 2470-0010. 96(1). doi: 10.1103/PhysRevD.96.012007. Fulltekst i vitenarkiv
• Aaboud, Morad; Aad, Georges; Abbott, Brad; Abdallah, Jalal; Abdinov, Ovsat Bahram oglu & Abeloos, Baptiste [Vis alle 48 forfattere av denne artikkelen] (2017). Jet reconstruction and performance using particle flow with the ATLAS Detector. European Physical Journal C. ISSN 1434-6044. 77:466(7), s. 1–47. doi: 10.1140/epjc/s10052-017-5031-2. Fulltekst i vitenarkiv
• Aaboud, Morad; Aad, Georges; Abbott, Brad; Abdallah, Jalal; Abdinov, Ovsat Bahram oglu & Abeloos, Baptiste [Vis alle 51 forfattere av denne artikkelen] (2017). High-ET isolated-photon plus jets production in pp collisions at √s=8TeV with the ATLAS detector. Nuclear Physics B. ISSN 0550-3213. 918, s. 257–316. doi: 10.1016/j.nuclphysb.2017.03.006. Fulltekst i vitenarkiv
• Aaboud, Morad; Aad, Georges; Abbott, Brad; Abdinov, Ovsat Bahram oglu; Abeloos, Baptiste & Abidi, Syed Haider [Vis alle 51 forfattere av denne artikkelen] (2017). Study of WWγ and WZγ production in pp collisions at √s=8TeV and search for anomalous quartic gauge couplings with the ATLAS experiment. European Physical Journal C. ISSN 1434-6044. 77:646(9), s. 1–30. doi: 10.1140/epjc/s10052-017-5180-3. Fulltekst i vitenarkiv
• Aaboud, Morad; Aad, Georges; Abbott, Brad; Abdinov, Ovsat Bahram oglu; Abeloos, Baptiste & Abidi, Syed Haider [Vis alle 51 forfattere av denne artikkelen] (2017). Search for supersymmetry in final states with two same-sign or three leptons and jets using 36 fb−1 of √s=13 TeV pp collision data with the ATLAS detector. Journal of High Energy Physics (JHEP). ISSN 1126-6708. 2017:84(9), s. 1–45. doi: 10.1007/JHEP09(2017)084. Fulltekst i vitenarkiv
• Aaboud, M.; Aad, G.; Abbott, B.; Abdinov, O.; Abeloos, B. & Abidi, S.H. [Vis alle 2 882 forfattere av denne artikkelen] (2017). Search for supersymmetry in events with b-tagged jets and missing transverse momentum in pp collisions at √s=13 TeV with the ATLAS detector. Journal of High Energy Physics (JHEP). ISSN 1126-6708. 2017(11). doi: 10.1007/JHEP11(2017)195. Fulltekst i vitenarkiv
• Aaboud, Morad; Aad, Georges; Abbott, Brad; Abdinov, Ovsat Bahram oglu; Abeloos, Baptiste & Abidi, Syed Haider [Vis alle 51 forfattere av denne artikkelen] (2017). Search for the dimuon decay of the Higgs Boson in pp Collisions at √s =13 TeV with the ATLAS Detector. Physical Review Letters. ISSN 0031-9007. 119:051802(5). doi: 10.1103/PhysRevLett.119.051802. Fulltekst i vitenarkiv
• Aaboud, Morad; Aad, Georges; Abbott, Brad; Abdinov, Ovsat Bahram oglu; Abeloos, Baptiste & Abidi, Syed Haider [Vis alle 51 forfattere av denne artikkelen] (2017). Measurement of WW/WZ→ℓνqq′ production with the hadronically decaying boson reconstructed as one or two jets in pp collisions at √s=8 TeV with ATLAS, and constraints on anomalous gauge couplings. European Physical Journal C. ISSN 1434-6044. 77:563(8), s. 1–31. doi: 10.1140/epjc/s10052-017-5084-2. Fulltekst i vitenarkiv
• Aaboud, Morad; Aad, Georges; Abbott, Brad; Abdallah, Jalal; Abdinov, Ovsat Bahram oglu & Abeloos, Baptiste [Vis alle 51 forfattere av denne artikkelen] (2017). Precision measurement and interpretation of inclusive W+, W- and Z/γ∗ production cross sections with the ATLAS detector. European Physical Journal C. ISSN 1434-6044. 77:367(6), s. 1–62. doi: 10.1140/epjc/s10052-017-4911-9. Fulltekst i vitenarkiv
• Aaboud, M.; Aad, G.; Abbott, B.; Abdinov, O.; Abeloos, B. & Abidi, S.H. [Vis alle 2 878 forfattere av denne artikkelen] (2017). Measurement of the tt¯ γ production cross section in proton-proton collisions at √s=8 TeV with the ATLAS detector. Journal of High Energy Physics (JHEP). ISSN 1126-6708. 2017(11). doi: 10.1007/JHEP11(2017)086. Fulltekst i vitenarkiv
• Aaboud, Morad; Aad, Georges; Abbott, Brad; Abdallah, Jalal; Abdinov, Ovsat Bahram oglu & Abeloos, Baptiste [Vis alle 51 forfattere av denne artikkelen] (2017). Study of the material of the ATLAS inner detector for Run 2 of the LHC. Journal of Instrumentation (JINST). 12(12). doi: 10.1088/1748-0221/12/12/P12009. Fulltekst i vitenarkiv
• Aaboud, Morad; Aad, Georges; Abbott, Brad; Abdallah, Jalal; Abdinov, Ovsat Bahram oglu & Abeloos, Baptiste [Vis alle 50 forfattere av denne artikkelen] (2017). Measurement of detector-corrected observables sensitive to the anomalous production of events with jets and large missing transverse momentum in pppp collisions at s√=13 TeV using the ATLAS detector. European Physical Journal C. ISSN 1434-6044. 77:765. doi: 10.1140/epjc/s10052-017-5315-6. Fulltekst i vitenarkiv
• Aaboud, Morad; Aad, Georges; Abbott, Brad; Abdinov, Ovsat Bahram oglu; Abeloos, Baptiste & Abidi, Syed Haider [Vis alle 51 forfattere av denne artikkelen] (2017). Study of ordered hadron chains with the ATLAS detector. Physical Review D. ISSN 2470-0010. 96:092008(9), s. 1–31. doi: 10.1103/PhysRevD.96.092008. Fulltekst i vitenarkiv
• Aaboud, M.; Aad, G.; Abbott, B.; Abdallah, J.; Abdinov, O. & Abeloos, B. [Vis alle 2 871 forfattere av denne artikkelen] (2017). Analysis of the Wtb vertex from the measurement of triple-differential angular decay rates of single top quarks produced in the t-channel at √s=8 TeV with the ATLAS detector. Journal of High Energy Physics (JHEP). ISSN 1126-6708. 2017(12). doi: 10.1007/JHEP12(2017)017. Fulltekst i vitenarkiv
• Aaboud, M.; Aad, G.; Abbott, B.; Abdallah, J.; Abdinov, O. & Abeloos, B. [Vis alle 2 852 forfattere av denne artikkelen] (2017). Probing the W tb vertex structure in t-channel single-top-quark production and decay in pp collisions at √s=8 TeV with the ATLAS detector. Journal of High Energy Physics (JHEP). ISSN 1126-6708. 2017(4). doi: 10.1007/JHEP04(2017)124. Fulltekst i vitenarkiv
• Aaboud, M.; Aad, G.; Abbott, B.; Abdallah, J.; Abdinov, O. & Abeloos, B. [Vis alle 2 874 forfattere av denne artikkelen] (2017). Determination of the strong coupling constant α<inf>s</inf> from transverse energy–energy correlations in multijet events at √s=8TeV using the ATLAS detector. European Physical Journal C. ISSN 1434-6044. 77(12). doi: 10.1140/epjc/s10052-017-5442-0. Fulltekst i vitenarkiv
• Aaboud, M.; Aad, G.; Abbott, B.; Abdinov, O.; Abeloos, B. & Abidi, S.H. [Vis alle 2 891 forfattere av denne artikkelen] (2017). Measurement of the Drell-Yan triple-differential cross section in pp collisions at √s=8 TeV. Journal of High Energy Physics (JHEP). ISSN 1126-6708. 2017(12). doi: 10.1007/JHEP12(2017)059. Fulltekst i vitenarkiv
• Aaboud, M.; Aad, G.; Abbott, B.; Abdallah, J.; Abdinov, O. & Abeloos, B. [Vis alle 2 839 forfattere av denne artikkelen] (2017). Measurement of charged-particle distributions sensitive to the underlying event in √s=13 TeV proton-proton collisions with the ATLAS detector at the LHC. Journal of High Energy Physics (JHEP). ISSN 1126-6708. 2017(3). doi: 10.1007/JHEP03(2017)157. Fulltekst i vitenarkiv
• Aaboud, Morad; Aad, Georges; Abbott, Brad; Abdinov, Ovsat Bahram oglu; Abeloos, Baptiste & Abidi, Syed Haider [Vis alle 51 forfattere av denne artikkelen] (2017). Search for direct top squark pair production in final states with two leptons in s√=13 TeV pp collisions with the ATLAS detector. European Physical Journal C. ISSN 1434-6044. 77:898(12), s. 1–41. doi: 10.1140/epjc/s10052-017-5445-x. Fulltekst i vitenarkiv
• Aaboud, Morad; Aad, Georges; Abbott, Brad; Abdallah, Jalal; Abdinov, Ovsat Bahram oglu & Abeloos, Baptiste [Vis alle 51 forfattere av denne artikkelen] (2017). Measurement of jet pT correlations in Pb + Pb and pp collisions at √sNN=2.76TeV with the ATLAS detector. Physics Letters B. ISSN 0370-2693. 774, s. 379–402. doi: 10.1016/j.physletb.2017.09.078. Fulltekst i vitenarkiv
• Aaboud, M.; Aad, G.; Abbott, B.; Abdallah, J.; Abdinov, O. & Abeloos, B. [Vis alle 2 842 forfattere av denne artikkelen] (2017). Measurements of top-quark pair differential cross-sections in the lepton+jets channel in pp collisions at √s=13 TeV using the ATLAS detector. Journal of High Energy Physics (JHEP). ISSN 1126-6708. 2017(11). doi: 10.1007/JHEP11(2017)191. Fulltekst i vitenarkiv
• Aaboud, M.; Aad, G.; Abbott, B.; Abdinov, O.; Abeloos, B. & Abidi, S.H. [Vis alle 2 873 forfattere av denne artikkelen] (2017). Search for a scalar partner of the top quark in the jets plus missing transverse momentum final state at √s=13 TeV with the ATLAS detector. Journal of High Energy Physics (JHEP). ISSN 1126-6708. 2017(12). doi: 10.1007/JHEP12(2017)085. Fulltekst i vitenarkiv
• Aaboud, M.; Aad, G.; Abbott, B.; Abdallah, J.; Abdinov, O. & Abeloos, B. [Vis alle 2 863 forfattere av denne artikkelen] (2017). Measurement of b-hadron pair production with the ATLAS detector in proton-proton collisions at √s=8 TeV. Journal of High Energy Physics (JHEP). ISSN 1126-6708. 2017(11). doi: 10.1007/JHEP11(2017)062. Fulltekst i vitenarkiv
• Aaboud, M.; Aad, G.; Abbott, B.; Abdallah, J.; Abdinov, O. & Abeloos, B. [Vis alle 2 834 forfattere av denne artikkelen] (2017). Measurements of top-quark pair to Z-boson cross-section ratios at √s=13 , 8, 7 TeV with the ATLAS detector. Journal of High Energy Physics (JHEP). ISSN 1126-6708. 2017(2). doi: 10.1007/JHEP02(2017)117. Fulltekst i vitenarkiv
• Aaboud, M.; Aad, G.; Abbott, B.; Abdallah, J.; Abdinov, O. & Abeloos, B. [Vis alle 2 852 forfattere av denne artikkelen] (2017). ATLAS Collaboration. Nuclear Physics A. ISSN 0375-9474. 967, s. 942–964. doi: 10.1016/S0375-9474(17)30376-7. Fulltekst i vitenarkiv
• Aaboud, M.; Aad, G.; Abbott, B.; Abdallah, J.; Abdinov, O. & Abeloos, B. [Vis alle 2 851 forfattere av denne artikkelen] (2017). Measurement of the inclusive cross-sections of single top-quark and top-antiquark t-channel production in pp collisions at √s=13 TeV with the ATLAS detector. Journal of High Energy Physics (JHEP). ISSN 1126-6708. 2017(4). doi: 10.1007/JHEP04(2017)086. Fulltekst i vitenarkiv

Se alle arbeider i NVA

• Aaboud, M.; Aad, G.; Abbott, B.; Abdinov, O.; Abeloos, B. & Abidi, S.H. [Vis alle 2 903 forfattere av denne artikkelen] (2023). Erratum to: Search for exclusive Higgs and Z boson decays to ϕγ and ργ with the ATLAS detector (Journal of High Energy Physics, (2018), 2018, 7, (127), 10.1007/JHEP07(2018)127). Journal of High Energy Physics (JHEP). ISSN 1126-6708. 2023(12). doi: 10.1007/JHEP12(2023)158. Fulltekst i vitenarkiv
• Aaboud, M.; Aad, G.; Abbott, B.; Abdallah, J.; Abdinov, O. & Abeloos, B. [Vis alle 2 841 forfattere av denne artikkelen] (2018). Erratum to: Measurement of the W-boson mass in pp collisions at √s=7 TeV with the ATLAS detector (The European Physical Journal C, (2018), 78, 2, (110), 10.1140/epjc/s10052-017-5475-4). European Physical Journal C. ISSN 1434-6044. 78(11). doi: 10.1140/epjc/s10052-018-6354-3. Fulltekst i vitenarkiv
• Aaboud, Morad; Aad, Georges; Abbott, Brad; Abdallah, Jalal; Abdinov, Ovsat Bahram oglu & Abeloos, Baptiste [Vis alle 50 forfattere av denne artikkelen] (2017). Correction to: Identification and rejection of pile-up jets at high pseudorapidity with the ATLAS detector (Eur. Phys. J. C, (2017), 77, (580), 10.1140/epjc/s10052-017-5081-5). European Physical Journal C. ISSN 1434-6044. 77:580(10), s. 1–14. doi: 10.1140/epjc/s10052-017-5245-3. Fulltekst i vitenarkiv
• Aad, G.; Abbott, B.; Abdallah, J.; Abdinov, O.; Aben, R. & Abolins, M. [Vis alle 2 865 forfattere av denne artikkelen] (2017). Erratum to: Measurement of the charge asymmetry in top-quark pair production in the lepton-plus-jets final state in pp collision data at √s = 8 TeV with the ATLAS detector (The European Physical Journal C, (2016), 76, 2, (87), 10.1140/epjc/s10052-016-3910-6). European Physical Journal C. ISSN 1434-6044. 77(8). doi: 10.1140/epjc/s10052-017-5089-x. Fulltekst i vitenarkiv

Se alle arbeider i NVA