Publications associated with Neutrinos

Z boson production in Pb+Pb collisions at √sNN = 5.02 TeV measured by the ATLAS experiment

Physics Letters B Elsevier 802 (2020)

A Abed Abud, K Abeling, SH Abidi, OS AbouZeid, NL Abraham, H Abramowicz, B Achkar, S Adachi, L Adam, C Adam Bourdarios, M Adersberger, S Adorni, T Adye, C Agheorghiesei, X Ai, G Aielli, K Al Khoury, GL Alberghi, J Albert, M Aleksa, IN Aleksandrov, C Alexa, D Alexandre, R Nickerson, Et al.

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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