2020/05/31 by S. Acharya, ALICE Collaboration, D. Adamová +98 · 17 citations
Physics and Astronomy · #Boson #Charged particle #High-Energy Particle Collisions Research #Invariant mass #Large Hadron Collider #Muon #Nuclear physics #Nucleon #Particle physics #Particle physics theoretical and experimental studies #Parton #Physics #Production (economics) #Pseudorapidity #Quantum Chromodynamics and Particle Interactions #Quantum chromodynamics #Quarkonium #Rapidity #Transverse mass #hep-ex #nucl-ex
paper · pdf · doi:10.1007/jhep09(2020)076
published in Journal of High Energy Physics 2020(9) (Springer Nature) · 22 pages, 5 captioned figures, 2 tables, authors from page 17, published version, figures at http://alice-publications.web.cern.ch/node/6216
openalex publication_date 2020/09/01 · openalex created_date 2020/10/29 · arxiv created 2021/03/05 · arxiv updated 2021/03/08 · openalex updated_date 2026/08/06
A bstract Measurement of Z-boson production in p-Pb collisions at √sNN <mml:math xmlns:mml="http://www.w3.org/1998/Math/MathML"><mml:msqrt><mml:msub><mml:mi>s</mml:mi><mml:mi>NN</mml:mi></mml:msub></mml:msqrt></mml:math> = 8 . 16 TeV and Pb-Pb collisions at √sNN <mml:math xmlns:mml="http://www.w3.org/1998/Math/MathML"><mml:msqrt><mml:msub><mml:mi>s</mml:mi><mml:mi>NN</mml:mi></mml:msub></mml:msqrt></mml:math> = 5 . 02 TeV is reported. It is performed in the dimuon decay channel, through the detection of muons with pseudorapidity − 4 < η μ < − 2 . 5 and transverse momentum pTμ <mml:math xmlns:mml="http://www.w3.org/1998/Math/MathML"><mml:msubsup><mml:mi>p</mml:mi><mml:mi>T</mml:mi><mml:mi>μ</mml:mi></mml:msubsup></mml:math> > 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 μμ < 120 GeV/ c 2 and rapidity 2 . 5 < ycmsμ μ <mml:math xmlns:mml="http://www.w3.org/1998/Math/MathML"><mml:msubsup><mml:mi>y</mml:mi><mml:mi>cms</mml:mi><mml:mi>μμ</mml:mi></mml:msubsup></mml:math> < 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 < ycmsμ μ <mml:math xmlns:mml="http://www.w3.org/1998/Math/MathML"><mml:msubsup><mml:mi>y</mml:mi><mml:mi>cms</mml:mi><mml:mi>μμ</mml:mi></mml:msubsup></mml:math> < − 2 . 96) and forward (2 . 03 < ycmsμ μ <mml:math xmlns:mml="http://www.w3.org/1998/Math/MathML"><mml:msubsup><mml:mi>y</mml:mi><mml:mi>cms</mml:mi><mml:mi>μμ</mml:mi></mml:msubsup></mml:math> < 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 σ 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.