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Type: Journal article
Title: Z boson production in Pb+Pb collisions at √sNN = 5.02 TeV measured by the ATLAS experiment
Other Titles: Z boson production in Pb+Pb collisions at root sNN = 5.02 TeV measured by the ATLAS experiment
Author: Aad, G.
Abbott, B.
Abbott, D.
Abed Abud, A.
Abeling, K.
Abhayasinghe, D.
Abidi, S.
AbouZeid, O.
Abraham, N.
Abramowicz, H.
Abreu, H.
Abulaiti, Y.
Acharya, B.
Achkar, B.
Adachi, S.
Adam, L.
Adam Bourdarios, C.
Adamczyk, L.
Adamek, L.
Adelman, J.
et al.
Citation: Physics Letters B, 2020; 802:135262-1-135262-23
Publisher: Elsevier
Issue Date: 2020
ISSN: 0370-2693
Statement of
G. Aad … A. Duvnjak … P. Jackson … J.L. Oliver … A. Petridis … A. Qureshi … A.S. Sharma … M.J. White … et al. [The ATLAS Collaboration]
Abstract: The production yield of Z bosons is measured in the electron and muon decay channels in Pb+Pb collisions at √sNN = 5.02 TeV with the ATLAS detector. Data from the 2015 LHC run corresponding to an integrated luminosity of 0.49 are used for the analysis. The Z boson yield, normalised by the total number of minimum-bias events and the mean nuclear thickness function, is measured as a function of dilepton rapidity and event centrality. The measurements in Pb+Pb collisions are compared with similar measurements made in proton–proton collisions at the same centre-of-mass energy. The nuclear modification factor is found to be consistent with unity for all centrality intervals. The results are compared with theoretical predictions obtained at next-to-leading order using nucleon and nuclear parton distribution functions. The normalised Z boson yields in Pb+Pb collisions lie 1–3σ above the predictions. The nuclear modification factor measured as a function of rapidity agrees with unity and is consistent with a next-to-leading-order QCD calculation including the isospin effect.
Rights: ©2020 The Author(s). Published by Elsevier B.V. This is an open access article under the CC BY license ( Funded by SCOAP³.
RMID: 1000013957
DOI: 10.1016/j.physletb.2020.135262
Appears in Collections:Physics publications

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