Measurement of Z<SUP>0</SUP>-boson production at large rapidities in Pb-Pb collisions at √<i>s</i><sub>NN</sub>=5.02 TeV



Acharya, S, Adamova, D, Adolfsson, J, Aggarwal, MM, Rinella, G Aglieri, Agnello, M, Agrawal, N, Ahammed, Z, Ahn, SU, Aiola, S
et al (show 976 more authors) (2018) Measurement of Z<SUP>0</SUP>-boson production at large rapidities in Pb-Pb collisions at √<i>s</i><sub>NN</sub>=5.02 TeV. PHYSICS LETTERS B, 780. pp. 372-383. ISSN 0370-2693, 1873-2445

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Abstract

The production of Z<sup>0</sup> bosons at large rapidities in Pb–Pb collisions at s<inf>NN</inf>=5.02TeV is reported. Z<sup>0</sup> candidates are reconstructed in the dimuon decay channel (Z<sup>0</sup>→μ<sup>+</sup>μ<sup>−</sup>), based on muons selected with pseudo-rapidity −4.0<η<−2.5 and p<inf>T</inf>>20GeV/c. The invariant yield and the nuclear modification factor, R<inf>AA</inf>, are presented as a function of rapidity and collision centrality. The value of R<inf>AA</inf> for the 0–20% central Pb–Pb collisions is 0.67±0.11(stat.)±0.03(syst.)±0.06(corr. syst.), exhibiting a deviation of 2.6σ from unity. The results are well-described by calculations that include nuclear modifications of the parton distribution functions, while the predictions using vacuum PDFs deviate from data by 2.3σ in the 0–90% centrality class and by 3σ in the 0–20% central collisions.

Item Type: Article
Uncontrolled Keywords: 5106 Nuclear and Plasma Physics, 5107 Particle and High Energy Physics, 51 Physical Sciences
Depositing User: Symplectic Admin
Date Deposited: 18 Feb 2019 17:56
Last Modified: 17 Jun 2025 08:03
DOI: 10.1016/j.physletb.2018.03.010
Open Access URL: https://doi.org/10.1016/j.physletb.2018.03.010
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URI: https://livrepository.liverpool.ac.uk/id/eprint/3033065