Z-boson production in p-Pb collisions at <mml:msqrt>sNN</mml:msqrt>=8.16 TeV and Pb-Pb collisions at <mml:msqrt>sNN</mml:msqrt>=5.02 TeV

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WEB OF SCIENCE

14
Citations

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18

초록

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 pT mu> 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(mu mu)< 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 3.4 sigma 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.

키워드

Lepton-Nucleon Scattering (experiments)Heavy-ion collisionElectroweak interactionParticle and resonance productionPARTON DISTRIBUTIONSPPB COLLISIONS
제목
Z-boson production in p-Pb collisions at <mml:msqrt>sNN</mml:msqrt>=8.16 TeV and Pb-Pb collisions at <mml:msqrt>sNN</mml:msqrt>=5.02 TeV
저자
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DOI
10.1007/JHEP09(2020)076
발행일
2020-09-10
유형
Article
저널명
Journal of High Energy Physics
9