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Article
Report number arXiv:2005.11126 ; CERN-EP-2020-090
Title Z-boson production in p-Pb collisions at sNN=8.16 TeV and Pb-Pb collisions at sNN=5.02 TeV
Author(s) ALICE Collaboration  Visualizza tutti i 1025 autori
Corporate author(s) The ALICE collaboration
Publication 2020-09-10
Imprint 20 May 2020
Number of pages 22
Note 22 pages, 5 captioned figures, 2 tables, authors from page 17, published version, figures at http://alice-publications.web.cern.ch/node/6216
Published in: JHEP 2009 (2020) 076
DOI 10.1007/JHEP09(2020)076
Subject category Nuclear Physics - Experiment ; hep-ex ; Particle Physics - Experiment ; nucl-ex
Accelerator/Facility, Experiment CERN LHC ; ALICE
Keywords relativistic heavy ion physics ; experimental results ; Z boson production
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 GeVc2 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.
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Copyright/License preprint: © 2020-2024 CERN (License: CC-BY-4.0)
publication: © 2020-2024 CERN (License: CC-BY-4.0), sponsored by SCOAP³
Submitted by yvonne.chiara.pachmayer@cern.ch



 


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