Maiken Pedersen

• Aad, G.; Aakvaag, Erlend; Abbott, B.; Abdelhameed, S.; Abeling, K. & Abicht, N. J. [Show all 2,932 contributors for this article] (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. Full text in Research Archive Show summary

  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. [Show all 2,942 contributors for this article] (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. 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 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. Full text in Research Archive Show summary

  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. [Show all 2,915 contributors for this article] (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. Full text in Research Archive Show summary

  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. [Show all 2,928 contributors for this article] (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. Full text in Research Archive Show summary

  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. [Show all 2,866 contributors for this article] (2026). Observation of a B_{c}^{*+} Meson with the ATLAS Detector. Physical Review Letters. ISSN 0031-9007. 137(14), p. 141901–141901. doi: 10.1103/vrxp-zkbs. Full text in Research Archive
• Aad, G.; Aakvaag, Erlend; Abbott, B.; Abdelhameed, S.; Abeling, K. & Abicht, N. J. [Show all 2,861 contributors for this article] (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), p. 021801–021801. doi: 10.1103/54vv-lgc7. Full text in Research Archive

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• Zwalinski, L.; Zou, W.; Zormpa, O.; Zorbas, T. G.; Zoch, K. & Zoccoli, A. [Show all 2,931 contributors for this article] (2026). Erratum: Precision measurement of the B0 meson lifetime using B0 → J/ ψ K*0 decays with the ATLAS detector. European Physical Journal C. ISSN 1434-6044. 86(1). doi: 10.1140/epjc/s10052-025-15188-5. Full text in Research Archive
• Zwalinski, L.; Zormpa, O.; Zorbas, T. G.; Zografos, A.; Zoch, K. & Zoccoli, A. [Show all 2,939 contributors for this article] (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. Full text in Research Archive
• Zwalinski, L.; Zormpa, O.; Zorbas, T. G.; Zografos, A.; Zoch, K. & Zoccoli, A. [Show all 2,854 contributors for this article] (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. Full text in Research Archive Show summary

  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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