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Jan Malamant

Doctoral Research Fellow - High Energy Physics

Email janmal@student.matnat.uio.no

Room Fysikkbygget, Rom Ø375

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Visiting address Sem Sælands vei 24 Fysikkbygningen 0371 Oslo

Postal address Postboks 1048 Blindern 0316 Oslo

Other affiliations Faculty of Mathematics and Natural Sciences (Student)

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Academic interests

Sensor development for the ATLAS experiment. Involved in the ITK upgrade project as well as the quantum sensing initiative.

Courses taught

- FYS2130: Svingninger og bølger

- FYS3231: Sensorer og måleteknikker

- FYS4110: Moderne kvantemekanikk

Background

Previously master student at the University of Oslo working on simulations of ultrafast laser cooling for studies of antimatter.

Publications

Scientific articles and book chapters

Zwalinski, L.; Zormpa, O.; Zorbas, T. G.; Zografos, A.; Zoch, K. & Zoccoli, A. [Show all 2,934 contributors for this article] (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. Full text in Research Archive
Aad, G.; Aakvaag, Erlend; Abbott, B.; Abdelhameed, S.; Abeling, K. & Abicht, N. J. [Show all 2,925 contributors for this article] (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. [Show all 2,939 contributors for this article] (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. Full text in Research Archive
Aad, G.; Aakvaag, Erlend; Abbott, B.; Abdelhameed, S.; Abeling, K. & Abicht, N. J. [Show all 2,842 contributors for this article] (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. Full text in Research Archive
Aad, G.; Aakvaag, Erlend; Abbott, B.; Abdelhameed, S.; Abeling, K. & Abicht, N. J. [Show all 2,939 contributors for this article] (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. Full text in Research Archive
Aad, G.; Aakvaag, Erlend; Abbott, B.; Abdelhameed, S.; Abeling, K. & Abicht, N. J. [Show all 2,859 contributors for this article] (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. Full text in Research Archive
Aad, G.; Aakvaag, Erlend; Abbott, B.; Abdelhameed, S.; Abeling, K. & Abicht, N. J. [Show all 2,863 contributors for this article] (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. Full text in Research Archive
Aad, G.; Aakvaag, Erlend; Abbott, B.; Abdelhameed, S.; Abeling, K. & Abicht, N. J. [Show all 2,934 contributors for this article] (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. Full text in Research Archive
Zwalinski, L.; Zormpa, O.; Zorbas, T. G.; Zografos, A.; Zoch, K. & Zoccoli, A. [Show all 2,932 contributors for this article] (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. Full text in Research Archive
Aad, G.; Aakvaag, Erlend; Abbott, B.; Abdelhameed, S.; Abeling, K. & Abicht, N. J. [Show all 2,860 contributors for this article] (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. Full text in Research Archive
Aad, G.; Aakvaag, Erlend; Abbott, B.; Abdelhameed, S.; Abeling, K. & Abicht, N. J. [Show all 2,860 contributors for this article] (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. Full text in Research Archive
Aad, G.; Aakvaag, Erlend; Abbott, B.; Abdelhameed, S.; Abeling, K. & Abicht, N. J. [Show all 2,934 contributors for this article] (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. Full text in Research Archive
Aad, G.; Aakvaag, Erlend; Abbott, B.; Abdelhameed, S.; Abeling, K. & Abicht, N. J. [Show all 2,933 contributors for this article] (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. Full text in Research Archive
Aad, G.; Aakvaag, Erlend; Abbott, B.; Abdelhameed, S.; Abeling, K. & Abicht, N. J. [Show all 2,938 contributors for this article] (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. Full text in Research Archive
Aad, G.; Aakvaag, Erlend; Abbott, B.; Abdelhameed, S.; Abeling, K. & Abicht, N. J. [Show all 2,923 contributors for this article] (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. Full text in Research Archive
Aad, G.; Aakvaag, Erlend; Abbott, B.; Abdelhameed, S.; Abeling, K. & Abicht, N. J. [Show all 2,925 contributors for this article] (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. Full text in Research Archive
Zwalinski, L.; Zormpa, O.; Zorbas, T. G.; Zografos, A.; Zoch, K. & Zoccoli, A. [Show all 2,931 contributors for this article] (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. Full text in Research Archive
Aad, G.; Aakvaag, Erlend; Abbott, B.; Abdelhameed, S.; Abeling, K. & Abicht, N. J. [Show all 2,929 contributors for this article] (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. Full text in Research Archive
Zwalinski, L.; Zormpa, O.; Zorbas, T. G.; Zografos, A.; Zoch, K. & Zoccoli, A. [Show all 2,929 contributors for this article] (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. Full text in Research Archive
Zwalinski, L.; Zormpa, O.; Zorbas, T. G.; Zografos, A.; Zoch, K. & Zoccoli, A. [Show all 2,926 contributors for this article] (2026). Transforming jet flavour tagging at ATLAS. Nature Communications. 17(1). doi: 10.1038/s41467-025-65059-6. Full text in Research Archive
Aad, G.; Aakvaag, Erlend; Abbott, B.; Abdelhameed, S.; Abeling, K. & Abicht, N. J. [Show all 2,934 contributors for this article] (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. Full text in Research Archive
Aad, G.; Aakvaag, Erlend; Abbott, B.; Abdelhameed, S.; Abeling, K. & Abicht, N. J. [Show all 2,911 contributors for this article] (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. Full text in Research Archive
Zwalinski, L.; Zormpa, O.; Zorbas, T. G.; Zografos, A.; Zoch, K. & Zoccoli, A. [Show all 2,903 contributors for this article] (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. Full text in Research Archive
Zwalinski, L.; Zou, W.; Zormpa, O.; Zorbas, T. G.; Zoch, K. & Zoccoli, A. [Show all 2,918 contributors for this article] (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. Full text in Research Archive Show summary
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. [Show all 2,915 contributors for this article] (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. Full text in Research Archive
Aad, G.; Aakvaag, Erlend; Abbott, B.; Abdelhameed, S.; Abeling, K. & Abicht, N. J. [Show all 2,924 contributors for this article] (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. Full text in Research Archive
Aad, G.; Aakvaag, Erlend; Abbott, B.; Abdelhameed, S.; Abeling, K. & Abicht, N. J. [Show all 2,913 contributors for this article] (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. Full text in Research Archive
Aad, G.; Aakvaag, Erlend; Abbott, B.; Abdelhameed, S.; Abeling, K. & Abicht, N. J. [Show all 2,909 contributors for this article] (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. Full text in Research Archive
Aad, G.; Aakvaag, Erlend; Abbott, B.; Abdelhameed, S.; Abeling, K. & Abicht, N. J. [Show all 2,898 contributors for this article] (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. Full text in Research Archive
Aad, G.; Aakvaag, Erlend; Abbott, B.; Abdelhameed, S.; Abeling, K. & Abicht, N. J. [Show all 2,920 contributors for this article] (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. Full text in Research Archive
Aad, G.; Aakvaag, Erlend; Abbott, B.; Abdelhameed, S.; Abeling, K. & Abicht, N. J. [Show all 2,914 contributors for this article] (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. Full text in Research Archive
Aad, G.; Aakvaag, Erlend; Abbott, B.; Abdelhameed, S.; Abeling, K. & Abicht, N. J. [Show all 2,922 contributors for this article] (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. Full text in Research Archive
Aad, G.; Aakvaag, Erlend; Abbott, B.; Abdelhameed, S.; Abeling, K. & Abicht, N. J. [Show all 2,923 contributors for this article] (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. Full text in Research Archive
Aad, G.; Aakvaag, Erlend; Abbott, B.; Abdelhameed, S.; Abeling, K. & Abicht, N. J. [Show all 2,901 contributors for this article] (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. Full text in Research Archive
Aad, G.; Aakvaag, Erlend; Abbott, B.; Abdelhameed, S.; Abeling, K. & Abicht, N. J. [Show all 2,905 contributors for this article] (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. Full text in Research Archive
Aad, G.; Aakvaag, Erlend; Abbott, B.; Abdelhameed, S.; Abeling, K. & Abicht, N. J. [Show all 2,903 contributors for this article] (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. Full text in Research Archive
Zwalinski, L.; Zormpa, O.; Zorbas, T. G.; Zografos, A.; Zoch, K. & Zoccoli, A. [Show all 2,902 contributors for this article] (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. Full text in Research Archive
Aad, G.; Aakvaag, Erlend; Abbott, B.; Abdelhameed, S.; Abeling, K. & Abicht, N. J. [Show all 2,931 contributors for this article] (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. Full text in Research Archive
Aad, G.; Aakvaag, Erlend; Abbott, B.; Abdelhameed, S.; Abeling, K. & Abicht, N. J. [Show all 2,916 contributors for this article] (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. Full text in Research Archive Show summary
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. [Show all 2,909 contributors for this article] (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. Full text in Research Archive
Aad, G.; Aad, G.; Aakvaag, Erlend; Abbott, B.; Abdelhameed, S. & Abeling, K. [Show all 2,924 contributors for this article] (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. Full text in Research Archive
Aad, G.; Aad, G.; Aakvaag, Erlend; Abbott, B.; Abdelhameed, S. & Abeling, K. [Show all 2,902 contributors for this article] (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. Full text in Research Archive
Aad, G.; Aakvaag, Erlend; Abbott, B.; Abdelhameed, S.; Abeling, K. & Abicht, N. J. [Show all 2,914 contributors for this article] (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. Full text in Research Archive
Zwalinski, L.; Zormpa, O.; Zorbas, T. G.; Zografos, A.; Zoch, K. & Zoccoli, A. [Show all 2,910 contributors for this article] (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. Full text in Research Archive
Zwalinski, L.; Zou, W.; Zormpa, O.; Zorbas, T. G.; Zoch, K. & Zoccoli, A. [Show all 2,911 contributors for this article] (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. Full text in Research Archive
Zwalinski, L.; Zormpa, O.; Zorbas, T. G.; Zografos, A.; Zoch, K. & Zoccoli, A. [Show all 2,935 contributors for this article] (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. Full text in Research Archive
Zwalinski, L.; Zormpa, O.; Zorbas, T. G.; Zografos, A.; Zoch, K. & Zoccoli, A. [Show all 2,914 contributors for this article] (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. Full text in Research Archive
Aad, G.; Aakvaag, Erlend; Abbott, B.; Abdelhameed, S.; Abeling, K. & Abicht, N. J. [Show all 2,924 contributors for this article] (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. Full text in Research Archive
Aad, G.; Aakvaag, Erlend; Abbott, B.; Abdelhameed, S.; Abeling, K. & Abicht, N. J. [Show all 2,935 contributors for this article] (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. Full text in Research Archive
Aad, G.; Aakvaag, Erlend; Abbott, B.; Abdelhameed, S.; Abeling, K. & Abicht, N. J. [Show all 2,914 contributors for this article] (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. Full text in Research Archive
Aad, G.; Aakvaag, Erlend; Abbott, B.; Abdelhameed, S.; Abeling, K. & Abicht, N. J. [Show all 2,935 contributors for this article] (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. Full text in Research Archive
Aad, G.; Aakvaag, Erlend; Abbott, B.; Abdelhameed, S.; Abeling, K. & Abicht, N. J. [Show all 2,914 contributors for this article] (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. Full text in Research Archive
Zwalinski, L.; Zormpa, O.; Zorbas, T. G.; Zografos, A.; Zoch, K. & Zoccoli, A. [Show all 2,938 contributors for this article] (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. Full text in Research Archive
Aad, G.; Abbott, B.; Abbott, D.C.; Abud, Abud Abed; Abeling, K. & Abhayasinghe, D.K. [Show all 2,965 contributors for this article] (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. Full text in Research Archive
Glöggler, Lisa Theresa; Gusakova, Natali; Rienäcker, Benjamin; Camper, Antoine Yves Marie Charles; Caravita, Ruggero & Huck, Saiva [Show all 53 contributors for this article] (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. Full text in Research Archive Show summary
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. [Show all 52 contributors for this article] (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. Full text in Research Archive Show summary
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. [Show all 55 contributors for this article] (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. Full text in Research Archive Show summary
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 [Show all 18 contributors for this article] (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. Full text in Research Archive Show summary
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. Full text in Research Archive
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. Full text in Research Archive Show summary
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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Published Feb. 28, 2024 10:41 AM - Last modified Aug. 13, 2024 12:35 PM

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The ATLAS Experiment at UiO

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High Energy Physics (HEP)