A1 Journal article (refereed)
Z-boson production in p-Pb collisions at √sNN = 8.16 TeV and Pb-Pb collisions at √sNN = 5.02 TeV (2020)


ALICE collaboration (2020). Z-boson production in p-Pb collisions at √sNN = 8.16 TeV and Pb-Pb collisions at √sNN = 5.02 TeV. Journal of High Energy Physics, 2020 (9), 76. DOI: 10.1007/jhep09(2020)076


JYU authors or editors


Publication details

All authors or editors: ALICE collaboration

Journal or series: Journal of High Energy Physics

ISSN: 1126-6708

eISSN: 1029-8479

Publication year: 2020

Volume: 2020

Issue number: 9

Article number: 76

Publisher: Springer

Publication country: Germany

Publication language: English

DOI: http://doi.org/10.1007/jhep09(2020)076

Open Access: Publication published in an open access channel

Publication is parallel published (JYX): https://jyx.jyu.fi/handle/123456789/71804

Web address of parallel published publication (pre-print): https://arxiv.org/abs/2005.11126


Abstract

Measurement of Z-boson production in p-Pb collisions at √sNN = 8.16 TeV and Pb-Pb collisions at √sNN = 5.02 TeV is reported. It is performed in the dimuon decay channel, through the detection of muons with pseudorapidity −4 < ημ < −2.5 and transverse momentum pμT> 20 GeV/c in the laboratory frame. The invariant yield and nuclear modification factor are measured for opposite-sign dimuons with invariant mass 60 < mμμ < 120 GeV/c2 and rapidity 2.5 < yμμcms< 4. They are presented as a function of rapidity and, for the Pb-Pb collisions, of centrality as well. The results are compared with theoretical calculations, both with and without nuclear modifications to the Parton Distribution Functions (PDFs). In p-Pb collisions the center-of-mass frame is boosted with respect to the laboratory frame, and the measurements cover the backward (−4.46 < yμμcms< −2.96) and forward (2.03 < yμμcms< 3.53) rapidity regions. For the p-Pb collisions, the results are consistent within experimental and theoretical uncertainties with calculations that include both free-nucleon and nuclear-modified PDFs. For the Pb-Pb collisions, a 3.4σ deviation is seen in the integrated yield between the data and calculations based on the free-nucleon PDFs, while good agreement is found once nuclear modifications are considered.


Keywords: particle physics

Free keywords: Lepton-Nucleon Scattering (experiments); Heavy-ion collision; Electroweakinteraction; Particle and resonance production


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Ministry reporting: Yes

Preliminary JUFO rating: 2


Last updated on 2020-18-09 at 10:48