Examinando por Autor "Abidi S.H"

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    Ítem
    Determination of jet calibration and energy resolution in proton–proton collisions at √s=8TeV using the ATLAS detector
    (Springer Science and Business Media Deutschland GmbH, 2020-12) Aaboud M.; Aad G.; Abbott B.; Abdinov O.; Abeloos B.; Abidi S.H; AbouZeid O.S.; Abraham N.L.; Abramowicz H.; Abreu H.; Abulaiti Y.; Acharya B.S
    The jet energy scale, jet energy resolution, and their systematic uncertainties are measured for jets reconstructed with the ATLAS detector in 2012 using proton–proton data produced at a centre-of-mass energy of 8 TeV with an integrated luminosity of 20fb-1. Jets are reconstructed from clusters of energy depositions in the ATLAS calorimeters using the anti-kt algorithm. A jet calibration scheme is applied in multiple steps, each addressing specific effects including mitigation of contributions from additional proton–proton collisions, loss of energy in dead material, calorimeter non-compensation, angular biases and other global jet effects. The final calibration step uses several in situ techniques and corrects for residual effects not captured by the initial calibration. These analyses measure both the jet energy scale and resolution by exploiting the transverse momentum balance in γ + jet, Z + jet, dijet, and multijet events. A statistical combination of these measurements is performed. In the central detector region, the derived calibration has a precision better than 1% for jets with transverse momentum 150GeVenergy resolution is (8.4 ± 0.6) % for pT=100GeV and (23 ± 2) % for pT=20GeV. The calibration scheme for jets with radius parameter R= 1.0 , for which jets receive a dedicated calibration of the jet mass, is also discussed. © 2020, The Author(s).
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    Erratum to: Measurement of light-by-light scattering and search for axion-like particles with 2.2 nb −1 of Pb+Pb data with the ATLAS detector (Journal of High Energy Physics, (2021), 2021, 3, (243), 10.1007/JHEP03(2021)243)
    (Springer Science and Business Media Deutschland GmbH, 2021-11) Aad G.; Abbott B; Abbott D.C.; Abed Abud A; Abeling K; Abhayasinghe D.K.; Abidi S.H; AbouZeid O.S.; Abraham N.L; Abramowicz H.; Abreu H.; Abulaiti Y
    One correction is noted for the paper, which does not affect the results reported. The right panel of figure 9 is corrected as it contained the “internal” label, giving the misleading impression on the credibility of the figure. © 2021, The Author(s).
  • Miniatura
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    Search for chargino-neutralino production with mass splittings near the electroweak scale in three-lepton final states in ffiffi s p = 13 TeV pp collisions with the ATLAS detector
    (American Physical Society, 2020-04) Aad G; Abbott B.; Abbott D.C; Abed Abud A; Abeling K; Abhayasinghe D.K.; Abidi S.H; Abouzeid O.S.; Abraham N.L; Abramowicz H.
    A search for supersymmetry through the pair production of electroweakinos with mass splittings near the electroweak scale and decaying via on-shell W and Z bosons is presented for a three-lepton final state. The analyzed proton-proton collision data taken at a center-of-mass energy of s=13 TeV were collected between 2015 and 2018 by the ATLAS experiment at the Large Hadron Collider, corresponding to an integrated luminosity of 139 fb-1. A search, emulating the recursive jigsaw reconstruction technique with easily reproducible laboratory-frame variables, is performed. The two excesses observed in the 2015-2016 data recursive jigsaw analysis in the low-mass three-lepton phase space are reproduced. Results with the full data set are in agreement with the Standard Model expectations. They are interpreted to set exclusion limits at the 95% confidence level on simplified models of chargino-neutralino pair production for masses up to 345 GeV. © 2020 CERN. © 2020 CERN, for the ATLAS Collaboration.