Z-boson production in p-Pb collisions at root s (NN)=8.16 TeV and Pb-Pb collisions at root s (NN)=5.02 TeV

0533933 - ÚJF 2021 RIV US eng J - Článek v odborném periodiku
Acharya, S. - Adamová, Dagmar - Bielčík, J. - Bielčíková, Jana - Broz, M. - Contreras, J. G. - Herman, T. - Horák, D. - Isakov, Artem - Křížek, Filip - Křížková Gajdošová, K. - Kushpil, Svetlana - Lavička, R. - Mareš, Jiří A. - Petráček, V. - Šafařík, K. - Šumbera, Michal - Závada, Petr … celkem 1007 autorů
Z-boson production in p-Pb collisions at root s (NN)=8.16 TeV and Pb-Pb collisions at root s (NN)=5.02 TeV.
Journal of High Energy Physics. Roč. 2020, č. 9 (2020), č. článku 76. ISSN 1029-8479. E-ISSN 1029-8479
Grant CEP: GA MŠMT(CZ) LM2018104; GA MŠMT(CZ) LTT17018
Institucionální podpora: RVO:68378271 ; RVO:61389005
Klíčová slova: ALICE collaboration * electroweak interaction * heavy-ion collision
Obor OECD: Nuclear physics; Particles and field physics (FZU-D)
Impakt faktor: 5.810, rok: 2020
Způsob publikování: Open access
https://doi.org/10.1007/JHEP09(2020)076

Measurement of Z-boson production in p-Pb collisions at 8.16 TeV and Pb-Pb collisions at = 5.02 TeV is reported. It is performed in the dimuon decay channel, through the detection of muons with pseudorapidity -4 <eta(mu)< -2.5 and transverse momentum pTmu> 20 GeV/c in the laboratory frame. The invariant yield and nuclear modification factor are measured for opposite-sign dimuons with invariant mass 60 m(<mumu)< 120 GeV/c(2) and rapidity 2.5 <ycms mu mu< 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 <ycms mu mu< -2.96) and forward (2.03 <ycms mu mu< 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 3.4sigma 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.
Trvalý link: http://hdl.handle.net/11104/0312162