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Jan Malamant

Stipendiat - Høyenergifysikk

E-post janmal@student.matnat.uio.no

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Besøksadresse Sem Sælands vei 24 Fysikkbygningen 0371 Oslo

Postadresse Postboks 1048 Blindern 0316 Oslo

Andre tilknytninger Det matematisk-naturvitenskapelige fakultet (Student)

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Aad, G.; Aakvaag, Erlend; Abbott, B.; Abdelhameed, S.; Abeling, K. & Abicht, N. J. [Vis alle 2 932 forfattere av denne artikkelen] (2026). Search for signatures of electroweakinos with photons, jets, and large missing transverse momentum in √s=13 TeV pp collisions with the ATLAS detector. Journal of High Energy Physics (JHEP). ISSN 1126-6708. 2026(4). doi: 10.1007/JHEP04(2026)150. Fulltekst i vitenarkiv Vis sammendrag
A search for final states characterised by at least one isolated high transversemomentum photon, jets and large missing transverse momentum is presented. Such a final state might occur in gauge-mediated supersymmetric models where a pair of binos and higgsinos mix to form neutralinos, one of which decays into a photon plus a gravitino while the other decays into a Higgs boson, a Z boson or a photon, plus a gravitino. The search is performed using the full Run-2 data sample of 140 fb−1 of √s = 13TeV proton-proton collisions collected by the ATLAS detector at the Large Hadron Collider. No significant excess of events is observed above the Standard Model prediction and model-dependent exclusion limits at the 95% confidence level are set. These limits are interpreted in terms of the masses of gauginos, which are excluded up to 1.2TeV depending on their branching ratios, and on their branching ratios as a function of their mass.
Aad, G.; Aakvaag, Erlend; Abbott, B.; Abdelhameed, S.; Abeling, K. & Abicht, N. J. [Vis alle 2 942 forfattere av denne artikkelen] (2026). Search for the Higgs boson decay to a Z boson and a photon in pp collisions at s=13 TeV and 13.6 TeV with the ATLAS detector. Physics Letters B. ISSN 0370-2693. 876. doi: 10.1016/j.physletb.2026.140313. Fulltekst i vitenarkiv
Aad, G.; Aakvaag, Erlend; Abbott, B.; Abdelhameed, S.; Abeling, K. & Abicht, N. J. [Vis alle 2 934 forfattere av denne artikkelen] (2026). Measurement of the top-quark mass using decays with a J/ψ meson at √s=13 TeV with the ATLAS detector. Journal of High Energy Physics (JHEP). ISSN 1126-6708. 2026(4). doi: 10.1007/JHEP04(2026)099. Fulltekst i vitenarkiv Vis sammendrag
The top-quark mass is measured using top-quark decays producing an isolated lepton and J/ψ meson reconstructed in its μ+μ− decay mode. The data sample was recorded with the ATLAS detector in proton-proton collisions at a centre-of-mass energy of √s = 13TeV during Run 2 of the Large Hadron Collider, corresponding to an integrated luminosity of 140 fb−1. The measurement is based on the invariant mass m(ℓμ+μ−) of the system made of the isolated lepton ℓ from the W boson decay and the non-isolated μ+μ− pair from a J/ψ decay of a b-hadron, exploiting its sensitivity to the top-quark mass. An unbinned maximumlikelihood fit to the m(ℓμ+μ−) distribution is performed to extract the top-quark mass. The top-quark mass is measured to be mtop = 172.17±0.80 (stat)±0.81 (syst)±1.07 (recoil) GeV, with a total uncertainty of 1.56 GeV. The third uncertainty arises from changing the dipole parton shower gluon-recoil scheme used in top-quark decays.
Zwalinski, L.; Zormpa, O.; Zorbas, T. G.; Zografos, A.; Zoch, K. & Zoccoli, A. [Vis alle 2 915 forfattere av denne artikkelen] (2026). Electroweak diboson production in association with a high-mass dijet system in semileptonic final states from pp collisions at √s=13 TeV with the ATLAS detector. European Physical Journal C. ISSN 1434-6044. 86(4). doi: 10.1140/epjc/s10052-025-15217-3. Fulltekst i vitenarkiv Vis sammendrag
This paper reports the observation of electroweak diboson (WW/WZ/ZZ) production in association with a high-mass dijet system, in which final states with one boson decaying leptonically and the other boson decaying hadronically are studied. The hadronically decaying W/Z boson is reconstructed as either two small-radius jets or one large-radius jet with jet substructure requirements. The data analyzed correspond to an integrated luminosity of 140 fb−1 of proton–proton collisions at a center-of-mass energy of √s = 13 TeV collected with the ATLAS detector during the 2015-2018 data taking at the Large Hadron Collider. The electroweak production of WW/WZ/ZZ in association with two jets is observed in a phase space dominated by vector-boson scattering with a significance of 7.4σ (expected 6.1σ) and the signal strength is determined to be 1.28+0.23 −0.21. The corresponding production cross section in a fiducial phase space is measured in addition. The signal strengths of both electroweak and QCD associated diboson productions are furthermore measured in a two-dimensional fit, the result of which agrees with the Standard Model prediction. The data are interpreted in the context of a dimension-8 effective field theory to probe anomalous quartic gauge couplings resulting in the first set of exclusion limits on the Wilson coefficients in the semileptonic channel reported by the ATLAS Collaboration. The observed limits for the S02, T0 and M0 operators are (−3.96 < fS02/4 < 3.96) TeV−4, (−0.25 < fT 0/4 < 0.22) TeV−4, (−1.26 < fM0/4 < 1.25) TeV−4.
Zwalinski, L.; Zormpa, O.; Zorbas, T. G.; Zografos, A.; Zoch, K. & Zoccoli, A. [Vis alle 2 928 forfattere av denne artikkelen] (2026). Measurement of the W-boson angular coefficients and transverse momentum in pp collisions at √s=13 TeV with the ATLAS detector. European Physical Journal C. ISSN 1434-6044. 86(5). doi: 10.1140/epjc/s10052-025-15264-w. Fulltekst i vitenarkiv Vis sammendrag
The angular distributions of Drell–Yan lepton pairs provide sensitive probes of the underlying dynamics of quantum chromodynamics (QCD) effects in vector-boson production. This paper presents for the first time the measurement of the full set of angular coefficients together with the differential cross-section as a function of the transverse momentum of the W boson, in the full phase space of the decay leptons. The measurements are performed separately for the W− and W+ channels. The analysis uses proton– proton collision data recorded by the ATLAS experiment at the Large Hadron Collider in 2017 and 2018, during special low-luminosity runs with a reduced number of interactions per bunch crossings (pile-up). The data correspond to an integrated luminosity of 338 pb−1 at a centre-of-mass energy of √s = 13 TeV. The low pile-up environment provides excellent experimental conditions for high-precision measurements ofW-boson production. All results agree with theoretical predictions incorporating finite-order QCD corrections up to order α2S.
Aad, G.; Aakvaag, Erlend; Abbott, B.; Abdelhameed, S.; Abeling, K. & Abicht, N. J. [Vis alle 2 866 forfattere av denne artikkelen] (2026). Observation of a B_{c}^{*+} Meson with the ATLAS Detector. Physical Review Letters. ISSN 0031-9007. 137(14), s. 141901–141901. doi: 10.1103/vrxp-zkbs. Fulltekst i vitenarkiv
Aad, G.; Aakvaag, Erlend; Abbott, B.; Abdelhameed, S.; Abeling, K. & Abicht, N. J. [Vis alle 2 861 forfattere av denne artikkelen] (2026). Combination of Measurements of CP Properties of Higgs Boson Interactions with Vector Bosons Using Proton-Proton Collisions at sqrt[s]=13 TeV with the ATLAS Detector. Physical Review Letters. ISSN 0031-9007. 137(2), s. 021801–021801. doi: 10.1103/54vv-lgc7. Fulltekst i vitenarkiv
Aad, G.; Aakvaag, Erlend; Abbott, B.; Abdelhameed, S.; Abeling, K. & Abicht, N. J. [Vis alle 2 850 forfattere av denne artikkelen] (2026). Search for long-lived charginos and τ-sleptons using final states with a disappearing track in pp collisions at √s=13 TeV with the ATLAS detector. Journal of High Energy Physics (JHEP). ISSN 1126-6708. 2026(7). doi: 10.1007/JHEP07(2026)152. Fulltekst i vitenarkiv Vis sammendrag
This paper reports a search for decays of long-lived charginos or τ-sleptons to final states containing a short disappearing track, a single high-energy jet, and missing transverse momentum. The search uses 137 fb−1 of data from 13 TeV proton–proton collisions recorded by the ATLAS detector during Run 2 of the LHC. Multiple search regions are defined, all requiring the presence of a track reconstructed from either three or four measurements in the innermost layers of the ATLAS detector. Regions with tracks having only three measurements are further characterised by the absence or presence of a low-energy charged pion reconstructed using a dedicated algorithm, leveraging machine learning. Data-driven methods are used to estimate the background contributions in the search regions. No significant excesses are found and 95% CL lower limits are placed on the masses of charginos and τ-sleptons in the lifetime range 0.01–10 ns. Observed (expected) mass limits of up to 225 GeV (250 GeV) are set for pure-higgsino charginos in scenarios with lifetimes below 0.03 ns, where the electroweakino mass splitting is entirely due to loop corrections involving the Standard Model bosons, and up to 720 GeV (840 GeV) for charginos with a lifetime of around 1 ns. For wino production, charginos with masses up to 880 GeV (1020 GeV) are excluded for lifetimes of around 1 ns. For τ-sleptons with lifetimes of around 1 ns, masses are excluded up to 320 GeV (390 GeV) in Constrained Minimal Supersymmetric Standard Model scenarios and 300 GeV (380 GeV) in Gauge-Mediated Supersymmetry-Breaking scenarios.
Aad, G.; Aakvaag, Erlend; Abbott, B.; Abdelhameed, S.; Abeling, K. & Abicht, N. J. [Vis alle 2 862 forfattere av denne artikkelen] (2026). Missing-mass search in forward-proton-tagged dilepton events with the ATLAS detector. Journal of High Energy Physics (JHEP). ISSN 1126-6708. 2026(7). doi: 10.1007/JHEP07(2026)236. Fulltekst i vitenarkiv
Aad, G.; Aakvaag, Erlend; Abbott, B.; Abdelhameed, S.; Abeling, K. & Abicht, N. J. [Vis alle 2 863 forfattere av denne artikkelen] (2026). Evidence of Higgs Boson Inclusive Production at High Transverse Momentum Decaying to a Pair of b-Quarks with the ATLAS Detector. Physical Review Letters. ISSN 0031-9007. 137(7), s. 071801–071801. doi: 10.1103/vbxg-71c2. Fulltekst i vitenarkiv
Aad, G.; Aakvaag, Erlend; Abbott, B.; Abdelhameed, S.; Abeling, K. & Abicht, N. J. [Vis alle 2 934 forfattere av denne artikkelen] (2026). Constraints on effective field theories via quadruple-differential angular decay rates from t-channel single-top-quark production at √s = 13 TeV with the ATLAS detector. Journal of High Energy Physics (JHEP). ISSN 1126-6708. 2026(7). doi: 10.1007/JHEP07(2026)107. Fulltekst i vitenarkiv
Zwalinski, L.; Zorbas, T. G.; Zografos, A.; Zoch, K.; Zoccoli, A. & Živković, L. [Vis alle 2 855 forfattere av denne artikkelen] (2026). Breaking barriers: the impact of ATLAS Virtual Visits in science communication. The European Physical Journal Plus. 141(7). doi: 10.1140/epjp/s13360-026-07771-w. Fulltekst i vitenarkiv Vis sammendrag
The ATLAS Collaboration at CERN’s Large Hadron Collider is at the forefront of particle physics research and is equally committed to bridging the gap between cutting-edge science and the wider public. Since 2010, the ATLAS Virtual Visits programme has provided live, interactive tours of the ATLAS detector and control room to global audiences in their language, without the need to travel. The programme has grown significantly since its inception, as demonstrated by quantitative data collected since January 2019 and case studies of large-scale implementations in Brazil and Greece. The impact on individual participants is also discussed.
Aad, G.; Aakvaag, Erlend; Abbott, B.; Abdelhameed, S.; Abeling, K. & Abicht, N. J. [Vis alle 2 865 forfattere av denne artikkelen] (2026). Study of particle fluence effects on collected charge and depletion voltage of the ATLAS IBL planar pixel sensors. Journal of Instrumentation (JINST). 21(7). doi: 10.1088/1748-0221/21/07/P07048. Fulltekst i vitenarkiv
Aad, G.; Aakvaag, Erlend; Abbott, B.; Abdelhameed, S.; Abeling, K. & Abicht, N. J. [Vis alle 2 860 forfattere av denne artikkelen] (2026). Effective field theory interpretation of ATLAS measurements involving the Higgs boson, electroweak bosons and the top quark. Journal of High Energy Physics (JHEP). ISSN 1126-6708. 2026(7). doi: 10.1007/JHEP07(2026)238. Fulltekst i vitenarkiv
Zwalinski, L.; Zormpa, O.; Zorbas, T. G.; Zografos, A.; Zoch, K. & Zoccoli, A. [Vis alle 2 853 forfattere av denne artikkelen] (2026). Calibration of the jet energy scale and resolution of small-radius jets using semileptonic tt¯ events with the ATLAS detector. European Physical Journal C. ISSN 1434-6044. 86(8). doi: 10.1140/epjc/s10052-026-15692-2. Fulltekst i vitenarkiv
Aad, G.; Aakvaag, Erlend; Abbott, B.; Abdelhameed, S.; Abeling, K. & Abicht, N. J. [Vis alle 2 927 forfattere av denne artikkelen] (2026). Search for electroweak tt̄Wj production in multileptonic final states at (Formula presented) = 13 TeV with the ATLAS detector and bounds on effective field theory operators. Physical Review D. ISSN 2470-0010. 114(1). doi: 10.1103/P5NZ-95M3. Fulltekst i vitenarkiv
Aad, G.; Aakvaag, Erlend; Abbott, B.; Abdelhameed, S.; Abeling, K. & Abicht, N. J. [Vis alle 2 863 forfattere av denne artikkelen] (2026). Measurements of Z-Boson Pair Entanglement in Decays of Higgs Bosons at the ATLAS Experiment. Physical Review Letters. ISSN 0031-9007. 137(11). doi: 10.1103/y1nh-1b82.
Aad, G.; Aakvaag, Erlend; Abbott, B.; Abdelhameed, S.; Abeling, K. & Abicht, N. J. [Vis alle 2 842 forfattere av denne artikkelen] (2026). Evidence of ZZγ Production with the ATLAS Detector. Physical Review Letters. ISSN 0031-9007. 137(9). doi: 10.1103/jngg-1nf3. Fulltekst i vitenarkiv
Aad, G.; Aakvaag, Erlend; Abbott, B.; Abdelhameed, S.; Abeling, K. & Abicht, N. J. [Vis alle 2 860 forfattere av denne artikkelen] (2026). Measurement of Charged-Particle Production in sqrt[s_{NN}]=9.62 TeV Proton-Oxygen Collisions as a Probe of Cosmic-Ray Air Showers with the ATLAS Detector. Physical Review Letters. ISSN 0031-9007. 137(12), s. 121901–121901. doi: 10.1103/f3nk-5lt9. Fulltekst i vitenarkiv
Aad, G.; Aakvaag, Erlend; Abbott, B.; Abdelhameed, S.; Abeling, K. & Abicht, N. J. [Vis alle 2 875 forfattere av denne artikkelen] (2026). Search for charginos and neutralinos with B - L R-parity violating decays inpffisffi=13 TeV and 13.6 TeV pp collisions with the ATLAS detector. Physical Review D. ISSN 2470-0010. 114(5). doi: 10.1103/RP69-XGKD. Fulltekst i vitenarkiv
Aad, G.; Aakvaag, Erlend; Abbott, B.; Abdelhameed, S.; Abeling, K. & Abicht, N. J. [Vis alle 2 865 forfattere av denne artikkelen] (2026). Measurements of the Higgs boson production, fiducial and differential cross-sections in the four lepton decay channel using 164 fb−1of data collected at √s=13.6 TeV with the ATLAS detector. Journal of High Energy Physics (JHEP). ISSN 1126-6708. 2026(8). doi: 10.1007/JHEP08(2026)052. Fulltekst i vitenarkiv
Aad, G.; Aakvaag, Erlend; Abbott, B.; Abdelhameed, S.; Abeling, K. & Abicht, N. J. [Vis alle 2 843 forfattere av denne artikkelen] (2026). Search for displaced decays of long-lived particles in events with missing transverse momentum in √s=13 TeV pp collisions with the ATLAS detector. Journal of High Energy Physics (JHEP). ISSN 1126-6708. 2026(8). doi: 10.1007/JHEP08(2026)016. Fulltekst i vitenarkiv
Aad, G.; Aakvaag, Erlend; Abbott, B.; Abdelhameed, S.; Abeling, K. & Abicht, N. J. [Vis alle 2 849 forfattere av denne artikkelen] (2026). Search for Higgs boson pair production in association with top-quark pairs using 196 fb−1of proton–proton collision data at √s=13 and 13.6 TeV with the ATLAS detector. Journal of High Energy Physics (JHEP). ISSN 1126-6708. 2026(8). doi: 10.1007/JHEP08(2026)020. Fulltekst i vitenarkiv
Aad, G.; Aakvaag, Erlend; Abbott, B.; Abdelhameed, S.; Abeling, K. & Abicht, N. J. [Vis alle 2 850 forfattere av denne artikkelen] (2026). A search for lepton-flavour violating t ? 3µ decays with the ATLAS detector. Physics Letters B. ISSN 0370-2693. 880. doi: 10.1016/j.physletb.2026.140748.
Aad, G.; Aakvaag, Erlend; Abbott, B.; Abdelhameed, S.; Abeling, K. & Abicht, N. J. [Vis alle 2 928 forfattere av denne artikkelen] (2026). Measurement of the azimuthal anisotropy of charged particles in √sNN = 5.36 TeV16O+16O and20Ne+20Ne collisions with the ATLAS detector. Physical Review C. ISSN 2469-9985. 113(4). doi: 10.1103/XQXZ-8BHF.
Zwalinski, L.; Zormpa, O.; Zorbas, T. G.; Zografos, A.; Zoch, K. & Zoccoli, A. [Vis alle 2 934 forfattere av denne artikkelen] (2026). Precise measurement of the tt¯ production cross-section and lepton differential distributions in eμ dilepton events from √s=13TeVpp collisions with the ATLAS detector. European Physical Journal C. ISSN 1434-6044. 86(5). doi: 10.1140/epjc/s10052-026-15311-0. Fulltekst i vitenarkiv
Aad, G.; Aakvaag, Erlend; Abbott, B.; Abdelhameed, S.; Abeling, K. & Abicht, N. J. [Vis alle 2 925 forfattere av denne artikkelen] (2026). Characterization of nuclear breakup as a function of hard-scattering kinematics using dijets measured by ATLAS in p+Pb collisions. Physics Letters B. ISSN 0370-2693. 877. doi: 10.1016/j.physletb.2026.140440.
Aad, G.; Aakvaag, Erlend; Abbott, B.; Abdelhameed, S.; Abeling, K. & Abicht, N. J. [Vis alle 2 939 forfattere av denne artikkelen] (2026). Search for a resonance decaying into a scalar particle and a Higgs boson in the final state with two bottom quarks and two photons with 199 fb−1 of data collected at √s=13 and 13.6 TeV with the ATLAS detector. Physics Letters B. ISSN 0370-2693. 877. doi: 10.1016/j.physletb.2026.140425. Fulltekst i vitenarkiv
Aad, G.; Aakvaag, Erlend; Abbott, B.; Abdelhameed, S.; Abeling, K. & Abicht, N. J. [Vis alle 2 842 forfattere av denne artikkelen] (2026). Search for massive, long-lived particles in events with displaced vertices and displaced muons in pp collisions at √s=13.6 TeV with the ATLAS experiment. Physics Letters B. ISSN 0370-2693. 878. doi: 10.1016/j.physletb.2026.140509. Fulltekst i vitenarkiv
Aad, G.; Aakvaag, Erlend; Abbott, B.; Abdelhameed, S.; Abeling, K. & Abicht, N. J. [Vis alle 2 939 forfattere av denne artikkelen] (2026). Search for higgsinos in compressed mass spectra using low-momentum tracks in pp collisions at √s=13 TeV with the ATLAS detector. Journal of High Energy Physics (JHEP). ISSN 1126-6708. 2026(6). doi: 10.1007/JHEP06(2026)094. Fulltekst i vitenarkiv
Aad, G.; Aakvaag, Erlend; Abbott, B.; Abdelhameed, S.; Abeling, K. & Abicht, N. J. [Vis alle 2 859 forfattere av denne artikkelen] (2026). Search for dimuon resonance in the 35 to 75 GeV mass range using 140 fb−1 of 13 TeV pp collisions with the ATLAS detector. Journal of High Energy Physics (JHEP). ISSN 1126-6708. 2026(6). doi: 10.1007/JHEP06(2026)165. Fulltekst i vitenarkiv
Aad, G.; Aakvaag, Erlend; Abbott, B.; Abdelhameed, S.; Abeling, K. & Abicht, N. J. [Vis alle 2 863 forfattere av denne artikkelen] (2026). Combined effective field theory interpretation of measurements sensitive to quartic gauge boson couplings in pp collisions at √s=13 TeV with the ATLAS detector. Physics Letters B. ISSN 0370-2693. 879. doi: 10.1016/j.physletb.2026.140683. Fulltekst i vitenarkiv
Aad, G.; Aakvaag, Erlend; Abbott, B.; Abdelhameed, S.; Abeling, K. & Abicht, N. J. [Vis alle 2 934 forfattere av denne artikkelen] (2026). Differential cross-section measurements of coherent production of singly and doubly resonant top-quark in WWbb events with one lepton at √s=13 TeV with the ATLAS detector. Journal of High Energy Physics (JHEP). ISSN 1126-6708. 2026(7). doi: 10.1007/JHEP07(2026)028. Fulltekst i vitenarkiv
Zwalinski, L.; Zormpa, O.; Zorbas, T. G.; Zografos, A.; Zoch, K. & Zoccoli, A. [Vis alle 2 932 forfattere av denne artikkelen] (2026). Search for emerging jets in pp collisions at √s=13TeV with the ATLAS experiment. European Physical Journal C. ISSN 1434-6044. 86(7). doi: 10.1140/epjc/s10052-026-15693-1. Fulltekst i vitenarkiv
Aad, G.; Aakvaag, Erlend; Abbott, B.; Abdelhameed, S.; Abeling, K. & Abicht, N. J. [Vis alle 2 860 forfattere av denne artikkelen] (2026). Measurement of the |Vcb| element of the CKM matrix in tt¯ decays with the ATLAS detector. Journal of High Energy Physics (JHEP). ISSN 1126-6708. 2026(7). doi: 10.1007/JHEP07(2026)078. Fulltekst i vitenarkiv
Aad, G.; Aakvaag, Erlend; Abbott, B.; Abdelhameed, S.; Abeling, K. & Abicht, N. J. [Vis alle 2 860 forfattere av denne artikkelen] (2026). Measurement of the Higgs boson production in association with top quarks in multilepton final states in pp collisions at √s=13 TeV with the ATLAS detector. Journal of High Energy Physics (JHEP). ISSN 1126-6708. 2026(5). doi: 10.1007/JHEP05(2026)183. Fulltekst i vitenarkiv
Aad, G.; Aakvaag, Erlend; Abbott, B.; Abdelhameed, S.; Abeling, K. & Abicht, N. J. [Vis alle 2 934 forfattere av denne artikkelen] (2026). Measurement of differential t-channel single top (anti)quark production cross-sections at 13 TeV with the ATLAS detector. Journal of High Energy Physics (JHEP). ISSN 1126-6708. 2026(5). doi: 10.1007/JHEP05(2026)174. Fulltekst i vitenarkiv
Aad, G.; Aakvaag, Erlend; Abbott, B.; Abdelhameed, S.; Abeling, K. & Abicht, N. J. [Vis alle 2 933 forfattere av denne artikkelen] (2026). Search for long-lived particles using displaced vertices of oppositely charged leptons in 140fb−1 of pp collisions at √s=13 TeV with the ATLAS detector. Physics Letters B. ISSN 0370-2693. 878. doi: 10.1016/j.physletb.2026.140497. Fulltekst i vitenarkiv
Aad, G.; Aakvaag, Erlend; Abbott, B.; Abdelhameed, S.; Abeling, K. & Abicht, N. J. [Vis alle 2 938 forfattere av denne artikkelen] (2026). Study of Higgs boson pair production in the HH→bb‾γγ final state with 308 fb−1 of data collected at √s= 13 TeV and 13.6 TeV by the ATLAS experiment. Physics Letters B. ISSN 0370-2693. 876. doi: 10.1016/j.physletb.2026.140280. Fulltekst i vitenarkiv
Aad, G.; Aakvaag, Erlend; Abbott, B.; Abdelhameed, S.; Abeling, K. & Abicht, N. J. [Vis alle 2 923 forfattere av denne artikkelen] (2026). Search for Higgs bosons produced in association with a high-energy photon via vector-boson fusion and decaying to a pair of b-quarks in the ATLAS detector. Physics Letters B. ISSN 0370-2693. doi: 10.1016/j.physletb.2026.140279. Fulltekst i vitenarkiv
Aad, G.; Aakvaag, Erlend; Abbott, B.; Abdelhameed, S.; Abeling, K. & Abicht, N. J. [Vis alle 2 925 forfattere av denne artikkelen] (2026). Measurement of coherent exclusive J/ψ → μ+μ−production in ultraperipheral Pb+Pb collisions at √sNN = 5.36 TeV with the ATLAS detector. Journal of High Energy Physics (JHEP). ISSN 1126-6708. 2026(4). doi: 10.1007/JHEP04(2026)020. Fulltekst i vitenarkiv
Zwalinski, L.; Zormpa, O.; Zorbas, T. G.; Zografos, A.; Zoch, K. & Zoccoli, A. [Vis alle 2 931 forfattere av denne artikkelen] (2026). Search for Beyond the Standard Model physics with anomaly detection in multilepton final states in pp collisions at √s = 13 TeV with the ATLAS detector. European Physical Journal C. ISSN 1434-6044. 86(3). doi: 10.1140/epjc/s10052-025-15218-2. Fulltekst i vitenarkiv
Aad, G.; Aakvaag, Erlend; Abbott, B.; Abdelhameed, S.; Abeling, K. & Abicht, N. J. [Vis alle 2 929 forfattere av denne artikkelen] (2026). Measurement of the top-quark Yukawa coupling from tt production in the lepton+jets final state using pp collisions at √s = 13 TeV with the ATLAS detector. Journal of High Energy Physics (JHEP). ISSN 1126-6708. 2026(1). doi: 10.1007/JHEP01(2026)117. Fulltekst i vitenarkiv
Zwalinski, L.; Zormpa, O.; Zorbas, T. G.; Zografos, A.; Zoch, K. & Zoccoli, A. [Vis alle 2 929 forfattere av denne artikkelen] (2026). Search for heavy neutral leptons in decays of W bosons produced in 13 TeV pp collisions using prompt signatures in the ATLAS detector. European Physical Journal C. ISSN 1434-6044. 86(2). doi: 10.1140/epjc/s10052-025-15191-w. Fulltekst i vitenarkiv
Zwalinski, L.; Zormpa, O.; Zorbas, T. G.; Zografos, A.; Zoch, K. & Zoccoli, A. [Vis alle 2 926 forfattere av denne artikkelen] (2026). Transforming jet flavour tagging at ATLAS. Nature Communications. 17(1). doi: 10.1038/s41467-025-65059-6. Fulltekst i vitenarkiv
Aad, G.; Aakvaag, Erlend; Abbott, B.; Abdelhameed, S.; Abeling, K. & Abicht, N. J. [Vis alle 2 934 forfattere av denne artikkelen] (2026). Observation of tt¯γγ production at √s=13 TeV with the ATLAS detector. Physics Letters B. ISSN 0370-2693. 874. doi: 10.1016/j.physletb.2026.140195. Fulltekst i vitenarkiv
Aad, G.; Aakvaag, Erlend; Abbott, B.; Abdelhameed, S.; Abeling, K. & Abicht, N. J. [Vis alle 2 911 forfattere av denne artikkelen] (2026). Evidence for the Collective Nature of Radial Flow in Pb+Pb Collisions with the ATLAS Detector. Physical Review Letters. ISSN 0031-9007. 136(3). doi: 10.1103/ldcn-r2lq. Fulltekst i vitenarkiv
Zwalinski, L.; Zormpa, O.; Zorbas, T. G.; Zografos, A.; Zoch, K. & Zoccoli, A. [Vis alle 2 903 forfattere av denne artikkelen] (2025). Search for a new pseudoscalar decaying into a pair of bottom and antibottom quarks in top-associated production in √s=13 TeV proton–proton collisions with the ATLAS detector. European Physical Journal C. ISSN 1434-6044. 85(8). doi: 10.1140/epjc/s10052-025-14507-0. Fulltekst i vitenarkiv
Zwalinski, L.; Zou, W.; Zormpa, O.; Zorbas, T. G.; Zoch, K. & Zoccoli, A. [Vis alle 2 918 forfattere av denne artikkelen] (2025). Measurement of W±-boson differential cross-sections in proton–proton collisions with low pile-up data at √s=5.02 TeV and 13TeV with the ATLAS detector. European Physical Journal C. ISSN 1434-6044. 85(7). doi: 10.1140/epjc/s10052-025-14178-x. Fulltekst i vitenarkiv Vis sammendrag
High precision single-differential W ±-boson pro- duction cross-sections as a function of electron or muon transverse momentum pT or their pseudorapity η, as well as double-differential cross-sections as functions of these vari- ables, are measured in proton–proton collisions at centre-of- mass energies √s = 5.02 TeV and 13 TeV. The W -boson charge asymmetry as a function of lepton η is also measured. The data, collected in dedicated runs at reduced instantaneous luminosity with the ATLAS detector at the Large Hadron Collider, correspond to integrated luminosities of 255 pb−1 at 5.02 TeV and 338 pb−1 at 13 TeV. The measurements are in agreement with Standard-Model predictions calculated at next-to-next-to-leading-order in the strong coupling constant αs including transverse-momentum resummation at next-to- next-to-leading logarithmic accuracy using several parton distribution functions. The impact of the measured differen- tial cross-sections as a function of lepton η on the determina- tion of these functions is studied using a profiling technique.
Aad, G.; Aakvaag, Erlend; Abbott, B.; Abdelhameed, S.; Abeling, K. & Abicht, N. J. [Vis alle 2 915 forfattere av denne artikkelen] (2025). Probing the Higgs boson CP properties in vector-boson fusion production in the H → τ+τ− channel with the ATLAS detector. Journal of High Energy Physics (JHEP). ISSN 1126-6708. 2025(10). doi: 10.1007/JHEP10(2025)092. Fulltekst i vitenarkiv
Aad, G.; Aakvaag, Erlend; Abbott, B.; Abdelhameed, S.; Abeling, K. & Abicht, N. J. [Vis alle 2 924 forfattere av denne artikkelen] (2025). Measurements and interpretations of W±Z production cross-sections in pp collisions at √s=13 TeV with the ATLAS detector. Journal of High Energy Physics (JHEP). ISSN 1126-6708. 2025(11). doi: 10.1007/JHEP11(2025)006. Fulltekst i vitenarkiv
Aad, G.; Aakvaag, Erlend; Abbott, B.; Abdelhameed, S.; Abeling, K. & Abicht, N. J. [Vis alle 2 913 forfattere av denne artikkelen] (2025). Search for emerging jets in pp collisions at √s = 13.6 TeV with the ATLAS experiment. Reports on progress in physics (Print). ISSN 0034-4885. 88(9). doi: 10.1088/1361-6633/adfe17. Fulltekst i vitenarkiv
Aad, G.; Aakvaag, Erlend; Abbott, B.; Abdelhameed, S.; Abeling, K. & Abicht, N. J. [Vis alle 2 909 forfattere av denne artikkelen] (2025). Evidence for Longitudinally Polarized W Bosons in the Electroweak Production of Same-Sign W Boson Pairs in Association with Two Jets in pp Collisions at √s = 13 TeV with the ATLAS Detector. Physical Review Letters. ISSN 0031-9007. 135(11). doi: 10.1103/bpln-ccql. Fulltekst i vitenarkiv
Aad, G.; Aakvaag, Erlend; Abbott, B.; Abdelhameed, S.; Abeling, K. & Abicht, N. J. [Vis alle 2 898 forfattere av denne artikkelen] (2025). Searches for direct slepton production in the compressed-mass corridor in √s = 13 TeV pp collisions with the ATLAS detector. Journal of High Energy Physics (JHEP). ISSN 1126-6708. 2025(8). doi: 10.1007/JHEP08(2025)053. Fulltekst i vitenarkiv
Aad, G.; Aakvaag, Erlend; Abbott, B.; Abdelhameed, S.; Abeling, K. & Abicht, N. J. [Vis alle 2 920 forfattere av denne artikkelen] (2025). Measurement of the top quark mass with the ATLAS detector using tt¯ events with a high transverse momentum top quark. Physics Letters B. ISSN 0370-2693. 867. doi: 10.1016/j.physletb.2025.139608. Fulltekst i vitenarkiv
Aad, G.; Aakvaag, Erlend; Abbott, B.; Abdelhameed, S.; Abeling, K. & Abicht, N. J. [Vis alle 2 914 forfattere av denne artikkelen] (2025). A measurement of the high-mass ττ¯ production cross-section at √s = 13 TeV with the ATLAS detector and constraints on new particles and couplings. Journal of High Energy Physics (JHEP). ISSN 1126-6708. 2025(10). doi: 10.1007/JHEP10(2025)054. Fulltekst i vitenarkiv
Aad, G.; Aakvaag, Erlend; Abbott, B.; Abdelhameed, S.; Abeling, K. & Abicht, N. J. [Vis alle 2 922 forfattere av denne artikkelen] (2025). Search for the production of a Higgs boson in association with a single top quark in pp collisions at √s=13 TeV with the ATLAS detector. Journal of High Energy Physics (JHEP). ISSN 1126-6708. 2025(10). doi: 10.1007/JHEP10(2025)093. Fulltekst i vitenarkiv
Aad, G.; Aakvaag, Erlend; Abbott, B.; Abdelhameed, S.; Abeling, K. & Abicht, N. J. [Vis alle 2 923 forfattere av denne artikkelen] (2025). A search for dark matter produced in association with a dark Higgs boson decaying into a Higgs boson pair in 3b or 4b final states using pp collisions at √s = 13 TeV with the ATLAS detector. Journal of High Energy Physics (JHEP). ISSN 1126-6708. 2025(9). doi: 10.1007/JHEP09(2025)067. Fulltekst i vitenarkiv
Aad, G.; Aakvaag, Erlend; Abbott, B.; Abdelhameed, S.; Abeling, K. & Abicht, N. J. [Vis alle 2 901 forfattere av denne artikkelen] (2025). Search for heavy neutral leptons in decays of W bosons using leptonic and semi-leptonic displaced vertices in √s = 13 TeV pp collisions with the ATLAS detector. Journal of High Energy Physics (JHEP). ISSN 1126-6708. 2025(7). doi: 10.1007/JHEP07(2025)196. Fulltekst i vitenarkiv
Aad, G.; Aakvaag, Erlend; Abbott, B.; Abdelhameed, S.; Abeling, K. & Abicht, N. J. [Vis alle 2 905 forfattere av denne artikkelen] (2025). Measurement of double-differential charged-current Drell-Yan cross-sections at high transverse masses in pp collisions at √s = 13 TeV with the ATLAS detector. Journal of High Energy Physics (JHEP). ISSN 1126-6708. 2025(7). doi: 10.1007/JHEP07(2025)026. Fulltekst i vitenarkiv
Aad, G.; Aakvaag, Erlend; Abbott, B.; Abdelhameed, S.; Abeling, K. & Abicht, N. J. [Vis alle 2 903 forfattere av denne artikkelen] (2025). Search for long-lived charged particles using large specific ionisation loss and time of flight in 140 fb−1 of pp collisions at √s = 13 TeV with the ATLAS detector. Journal of High Energy Physics (JHEP). ISSN 1126-6708. 2025(7). doi: 10.1007/JHEP07(2025)140. Fulltekst i vitenarkiv
Zwalinski, L.; Zormpa, O.; Zorbas, T. G.; Zografos, A.; Zoch, K. & Zoccoli, A. [Vis alle 2 902 forfattere av denne artikkelen] (2025). Search for electroweak production of vector-like leptons in τ-lepton and b-jet final states in pp collisions at √s = 13 TeV with the ATLAS detector. European Physical Journal C. ISSN 1434-6044. 85(11). doi: 10.1140/epjc/s10052-025-14748-z. Fulltekst i vitenarkiv
Aad, G.; Aakvaag, Erlend; Abbott, B.; Abdelhameed, S.; Abeling, K. & Abicht, N. J. [Vis alle 2 931 forfattere av denne artikkelen] (2025). Evidence for the Dimuon Decay of the Higgs Boson in 𝑝⁢𝑝 Collisions with the ATLAS Detector. Physical Review Letters. ISSN 0031-9007. 135(23). doi: 10.1103/gzdh-p159. Fulltekst i vitenarkiv
Aad, G.; Aakvaag, Erlend; Abbott, B.; Abdelhameed, S.; Abeling, K. & Abicht, N. J. [Vis alle 2 916 forfattere av denne artikkelen] (2025). Observation of double parton scattering in same-sign W boson pair production in pp collisions at s=13 TeV with the ATLAS detector. Physics Letters B. ISSN 0370-2693. 870. doi: 10.1016/j.physletb.2025.139892. Fulltekst i vitenarkiv Vis sammendrag
This letter reports the measurement of double parton scattering in same-sign W boson pair production with the ATLAS detector. The data set used corresponds to an integrated luminosity of 140 fb−1 of proton–proton collisions at a center-of-mass energy of 13 TeV, collected during Run 2 of the Large Hadron Collider. The study is performed in final states including two same-charge leptons, electron or muon, missing transverse momentum, and up to one jet. An excess of events is observed over the expected background contributions with a significance of 8.8 standard deviations. The measured fiducial cross section times leptonic branching fraction is 4.59 ± 0.64 fb. The measurement corresponds to a double parton scattering effective cross section of 10.6 ± 1.8 mb.
Aad, G.; Aakvaag, Erlend; Abbott, B.; Abdelhameed, S.; Abeling, K. & Abicht, N. J. [Vis alle 2 909 forfattere av denne artikkelen] (2025). Constraining off-shell Higgs boson production and the Higgs boson total width using WW → ℓνℓν final states with the ATLAS detector. Physics Letters B. ISSN 0370-2693. 870. doi: 10.1016/j.physletb.2025.139898. Fulltekst i vitenarkiv
Aad, G.; Aad, G.; Aakvaag, Erlend; Abbott, B.; Abdelhameed, S. & Abeling, K. [Vis alle 2 924 forfattere av denne artikkelen] (2025). Search for electroweak-scale dijet resonances using trigger-level analysis with the ATLAS detector in 132 fb− 1 of pp collisions at √s = 13 TeV. Physical Review D. ISSN 2470-0010. 112(9). doi: 10.1103/15p2-bkg8. Fulltekst i vitenarkiv
Aad, G.; Aad, G.; Aakvaag, Erlend; Abbott, B.; Abdelhameed, S. & Abeling, K. [Vis alle 2 902 forfattere av denne artikkelen] (2025). Search for events with one displaced vertex from long-lived neutral particles decaying into hadronic jets in the ATLAS muon spectrometer in 𝑝⁢𝑝 collisions at √𝑠 = 13 TeV. Physical Review D. ISSN 2470-0010. 112(9). doi: 10.1103/cmql-s9sq. Fulltekst i vitenarkiv
Aad, G.; Aakvaag, Erlend; Abbott, B.; Abdelhameed, S.; Abeling, K. & Abicht, N. J. [Vis alle 2 914 forfattere av denne artikkelen] (2025). Measurement of substructure-dependent suppression of large-radius jets with charged particles in Pb+Pb collisions with ATLAS. Physics Letters B. ISSN 0370-2693. 871. doi: 10.1016/j.physletb.2025.139929. Fulltekst i vitenarkiv
Zwalinski, L.; Zormpa, O.; Zorbas, T. G.; Zografos, A.; Zoch, K. & Zoccoli, A. [Vis alle 2 910 forfattere av denne artikkelen] (2025). Measurements of Higgs boson production via gluon–gluon fusion and vector-boson fusion using H→WW∗→ℓνℓν decays in pp collisions with the ATLAS detector and their effective field theory interpretations. European Physical Journal C. ISSN 1434-6044. 85(12). doi: 10.1140/epjc/s10052-025-14761-2. Fulltekst i vitenarkiv
Zwalinski, L.; Zou, W.; Zormpa, O.; Zorbas, T. G.; Zoch, K. & Zoccoli, A. [Vis alle 2 911 forfattere av denne artikkelen] (2025). Estimation of backgrounds from jets misidentified as τ-leptons using the Universal Fake Factor method with the ATLAS detector. European Physical Journal C. ISSN 1434-6044. 85(12). doi: 10.1140/epjc/s10052-025-14916-1. Fulltekst i vitenarkiv
Zwalinski, L.; Zormpa, O.; Zorbas, T. G.; Zografos, A.; Zoch, K. & Zoccoli, A. [Vis alle 2 935 forfattere av denne artikkelen] (2025). Search for squarks and gluinos in pp collisions at √s = 13 TeV and 13.6 TeV in events with τ-leptons, jets and missing transverse momentum using the ATLAS detector. European Physical Journal C. ISSN 1434-6044. 85(12). doi: 10.1140/epjc/s10052-025-14957-6. Fulltekst i vitenarkiv
Zwalinski, L.; Zormpa, O.; Zorbas, T. G.; Zografos, A.; Zoch, K. & Zoccoli, A. [Vis alle 2 914 forfattere av denne artikkelen] (2025). Measurement of high-mass tt¯ℓ+ℓ- production and lepton flavour universality-inspired effective field theory interpretations at √s=13 TeV with the ATLAS detector. European Physical Journal C. ISSN 1434-6044. 85(12). doi: 10.1140/epjc/s10052-025-14695-9. Fulltekst i vitenarkiv
Aad, G.; Aakvaag, Erlend; Abbott, B.; Abdelhameed, S.; Abeling, K. & Abicht, N. J. [Vis alle 2 924 forfattere av denne artikkelen] (2025). Observation of W+W−γ production in pp collisions at √𝑠 = 13 TeV with the ATLAS detector and constraints on anomalous quartic gauge-boson couplings. Physics Letters B. ISSN 0370-2693. 873. doi: 10.1016/j.physletb.2025.140050. Fulltekst i vitenarkiv
Aad, G.; Aakvaag, Erlend; Abbott, B.; Abdelhameed, S.; Abeling, K. & Abicht, N. J. [Vis alle 2 935 forfattere av denne artikkelen] (2025). Search for resonant leptoquark production via lepton-jet signatures in pp collisions at s=13 TeV and s=13.6 TeV with the ATLAS detector. Journal of High Energy Physics (JHEP). ISSN 1126-6708. 2025(12). doi: 10.1007/JHEP12(2025)180. Fulltekst i vitenarkiv
Aad, G.; Aakvaag, Erlend; Abbott, B.; Abdelhameed, S.; Abeling, K. & Abicht, N. J. [Vis alle 2 914 forfattere av denne artikkelen] (2025). Search for decays of the Higgs boson into scalar particles decaying into four or six b quarks using pp collisions at (Formula presented) = 13 TeV with the ATLAS detector. Physical Review D. ISSN 2470-0010. 112(7). doi: 10.1103/mzld-ldlt. Fulltekst i vitenarkiv
Aad, G.; Aakvaag, Erlend; Abbott, B.; Abdelhameed, S.; Abeling, K. & Abicht, N. J. [Vis alle 2 935 forfattere av denne artikkelen] (2025). Measurement of the top-quark pole mass in dileptonic tt¯ + 1-jet events at s=13 TeV with the ATLAS experiment. Journal of High Energy Physics (JHEP). ISSN 1126-6708. 2025(12). doi: 10.1007/JHEP12(2025)023. Fulltekst i vitenarkiv
Aad, G.; Aakvaag, Erlend; Abbott, B.; Abdelhameed, S.; Abeling, K. & Abicht, N. J. [Vis alle 2 914 forfattere av denne artikkelen] (2025). Search for single production of vector-like quarks decaying into W (ℓν)b in pp collisions at √s = 13 TeV with the ATLAS detector. Journal of High Energy Physics (JHEP). ISSN 1126-6708. 2025(12). doi: 10.1007/JHEP12(2025)012. Fulltekst i vitenarkiv
Zwalinski, L.; Zormpa, O.; Zorbas, T. G.; Zografos, A.; Zoch, K. & Zoccoli, A. [Vis alle 2 938 forfattere av denne artikkelen] (2025). The environmental impact, carbon emissions and sustainability of computing in the ATLAS experiment. European Physical Journal C. ISSN 1434-6044. 85(12). doi: 10.1140/epjc/s10052-025-14976-3. Fulltekst i vitenarkiv
Aad, G.; Abbott, B.; Abbott, D.C.; Abud, Abud Abed; Abeling, K. & Abhayasinghe, D.K. [Vis alle 2 965 forfattere av denne artikkelen] (2025). Expected tracking performance of the ATLAS Inner Tracker at the High-Luminosity LHC. Journal of Instrumentation (JINST). 20(2). doi: 10.1088/1748-0221/20/02/P02018. Fulltekst i vitenarkiv
Glöggler, Lisa Theresa; Gusakova, Natali; Rienäcker, Benjamin; Camper, Antoine Yves Marie Charles; Caravita, Ruggero & Huck, Saiva [Vis alle 53 forfattere av denne artikkelen] (2024). Positronium Laser Cooling via the 13S-23P Transition with a Broadband Laser Pulse. Physical Review Letters. ISSN 0031-9007. 132(8). doi: 10.1103/PhysRevLett.132.083402. Fulltekst i vitenarkiv Vis sammendrag
We report on laser cooling of a large fraction of positronium (Ps) in free flight by strongly saturating the 13⁢𝑆�−23⁢𝑃� transition with a broadband, long-pulsed 243 nm alexandrite laser. The ground state Ps cloud is produced in a magnetic and electric field-free environment. We observe two different laser-induced effects. The first effect is an increase in the number of atoms in the ground state after the time Ps has spent in the long-lived 23⁢𝑃� states. The second effect is one-dimensional Doppler cooling of Ps, reducing the cloud’s temperature from 380(20) to 170(20) K. We demonstrate a 58(9)% increase in the fraction of Ps atoms with 𝑣�1⁢D<3.7×104 m⁢s−1.
Volponi, Marco; Huck, Saiva; Caravita, Ruggero; Zielinski, Jakub; Kornakov, Georgy & Karprowicz, G. [Vis alle 52 forfattere av denne artikkelen] (2024). CIRCUS: an autonomous control system for antimatter, atomic and quantum physics experiments. EPJ Quantum Technology. ISSN 2662-4400. 11(1). doi: 10.1140/epjqt/s40507-024-00220-6. Fulltekst i vitenarkiv Vis sammendrag
A powerful and robust control system is a crucial, often neglected, pillar of any modern, complex physics experiment that requires the management of a multitude of different devices and their precise time synchronisation. The AEḡIS collaboration presents CIRCUS, a novel, autonomous control system optimised for time-critical experiments such as those at CERN’s Antiproton Decelerator and, more broadly, in atomic and quantum physics research. Its setup is based on Sinara/ARTIQ and TALOS, integrating the ALPACA analysis pipeline, the last two developed entirely in AEḡIS. It is suitable for strict synchronicity requirements and repeatable, automated operation of experiments, culminating in autonomous parameter optimisation via feedback from real-time data analysis. CIRCUS has been successfully deployed and tested in AEḡIS; being experiment-agnostic and released open-source, other experiments can leverage its capabilities.
Volponi, M.; Zielinski, J.; Rauschendorfer, T.; Huck, S.; Caravita, R. & Auzins, M. [Vis alle 55 forfattere av denne artikkelen] (2024). TALOS (Total Automation of LabVIEW Operations for Science): A framework for autonomous control systems for complex experiments. Review of Scientific Instruments. ISSN 0034-6748. 95(8). doi: 10.1063/5.0196806. Fulltekst i vitenarkiv Vis sammendrag
Modern physics experiments are frequently very complex, relying on multiple simultaneous events to happen in order to obtain the desired result. The experiment control system plays a central role in orchestrating the measurement setup: However, its development is often treated as secondary with respect to the hardware, its importance becoming evident only during the operational phase. Therefore, the AEgIS (Antimatter Experiment: Gravity, Interferometry, Spectroscopy) collaboration has created a framework for easily coding control systems, specifically targeting atomic, quantum, and antimatter experiments. This framework, called Total Automation of LabVIEW Operations for Science (TALOS), unifies all the machines of the experiment in a single entity, thus enabling complex high-level decisions to be taken, and it is constituted by separate modules, called MicroServices, that run concurrently and asynchronously. This enhances the stability and reproducibility of the system while allowing for continuous integration and testing while the control system is running. The system demonstrated high stability and reproducibility, running completely unsupervised during the night and weekends of the data-taking campaigns. The results demonstrate the suitability of TALOS to manage an entire physics experiment in full autonomy: being open-source, experiments other than the AEgIS experiment can benefit from it.
Gusakova, Natali; Camper, Antoine Yves Marie Charles; Caravita, Ruggero; Penasa, Luca; Glöggler, Lisa Theresa & Wolz, Tim [Vis alle 18 forfattere av denne artikkelen] (2024). An alexandrite laser system for positronium laser cooling. Optics and Laser Technology. ISSN 0030-3992. 182(B). doi: 10.1016/j.optlastec.2024.112097. Fulltekst i vitenarkiv Vis sammendrag
We report on a Q-switched alexandrite based ∼100ns long pulse duration ultra-violet laser system. The central wavelength of the fundamental pulse is set by a Volume Bragg Grating in reflection and can be tuned between 728nm and 742nm. The spectral bandwidth is ∼130GHz. This laser system was designed in view of Doppler cooling of a cloud of a near room temperature positronium by strongly saturating the 13S–23P transition. In addition, we report on the development of a KD*P Pockels cell driver designed to both Q-switch the cavity and induce a sharp falling edge of the laser pulse so that the end of the positronium-laser interaction time can be controlled with nanosecond precision.
Malamant, Jan; Gusakova, Natali; Sandaker, Heidi; Sorokina, Irina T; Comparat, Daniel & Camper, Antoine Yves Marie Charles (2024). Coherent laser cooling with trains of ultrashort laser pulses. arXiv.org. ISSN 2331-8422. doi: 10.48550/arXiv.2402.17052. Fulltekst i vitenarkiv
Malamant, Jan; Gusakova, Natali; Sandaker, Heidi; Sorokina, Irina T; Comparat, D. & Camper, Antoine Yves Marie Charles (2024). Coherent laser cooling with trains of ultrashort laser pulses. Physical Review A (PRA). ISSN 2469-9926. 110(1). doi: 10.1103/PhysRevA.110.013109. Fulltekst i vitenarkiv Vis sammendrag
We propose to extend coherent laser cooling from narrowband to broadband transitions by using trains of ultrashort broadband pulses. We analytically study two possible methods to reduce the momentum spread of a distribution by several units of photon momentum in a single spontaneous emission lifetime. We report on numerical simulations of one-dimensional laser cooling of a two-level system with realistic parameters. With this scheme, coherent laser cooling can in particular be implemented in the case of fast species with a short lifetime such as positronium.

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Zwalinski, L.; Zormpa, O.; Zorbas, T. G.; Zografos, A.; Zoch, K. & Zoccoli, A. [Vis alle 2 939 forfattere av denne artikkelen] (2026). Erratum: The environmental impact, carbon emissions and sustainability of computing in the ATLAS experiment. European Physical Journal C. ISSN 1434-6044. 86(3). doi: 10.1140/epjc/s10052-026-15357-0. Fulltekst i vitenarkiv
Zwalinski, L.; Zormpa, O.; Zorbas, T. G.; Zografos, A.; Zoch, K. & Zoccoli, A. [Vis alle 2 854 forfattere av denne artikkelen] (2026). Publisher Correction: Calibration of the jet energy scale and resolution of small-radius jets using semileptonic tt¯ events with the ATLAS detector. European Physical Journal C. ISSN 1434-6044. 86(10). doi: 10.1140/epjc/s10052-026-16348-x. Fulltekst i vitenarkiv Vis sammendrag
In the originally published article, several typographical and formatting errors were identified. In the PDF version, on page 10 (bottom left), the terms “POWHEGinterfaced” and “POWHEGsettings” should read “POWHEGinterfaced” and “POWHEG settings”, respectively. In the online version, instances of “T{eV}” and “G{eV}” throughout the text should read “TeV” and “GeV”, respectively. The publisher regrets these errors and any inconvenience they may have caused.

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Publisert 28. feb. 2024 10:40 - Sist endret 28. feb. 2024 10:40

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ATLAS-eksperimentet på UiO