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Z boson production in Pb+Pb collisions at s<inf>NN</inf>=5.02 TeV measured by the ATLAS experiment

Physics Letters, Section B: Nuclear, Elementary Particle and High-Energy Physics 802 (2020)

B Acharya, B Achkar, S Adachi, L Adam, C Adam Bourdarios, L Adamczyk, L Adamek, J Adelman, M Adersberger, A Adiguzel, S Adorni, T Adye, M Agaras, A Aggarwal, C Agheorghiesei, S Akatsuka, M Alconada Verzini, S Alderweireldt, M Aleksa, I Aleksandrov, C Alexa, D Alexandre, T Alexopoulos, A Alfonsi

© 2020 The Author(s) 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 nb−1 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.


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