Constraints on the initial state of Pb-Pb collisions via measurements of Z-boson yields and azimuthal anisotropy at sqrt[s_{NN}]=5.02 TeV
File(s)
Published version
Author(s)
Type
Journal Article
Abstract
The CMS experiment at the LHC has measured the differential cross sections of Z bosons decaying to pairs of leptons, as functions of transverse momentum and rapidity, in lead-lead collisions at a nucleon-nucleon center-of-mass energy of 5.02 TeV. The measured Z boson elliptic azimuthal anisotropy coefficient is compatible with zero, showing that Z bosons do not experience significant final-state interactions in the medium produced in the collision. Yields of Z bosons are compared to Glauber model predictions and are found to deviate from these expectations in peripheral collisions, indicating the presence of initial collision geometry and centrality selection effects. The precision of the measurement allows, for the first time, for a data-driven determination of the nucleon-nucleon integrated luminosity as a function of lead-lead centrality, thereby eliminating the need for its estimation based on a Glauber model.
Date Issued
2021-09-03
Date Acceptance
2021-07-27
Citation
Physical Review Letters, 2021, 127 (10)
ISSN
0031-9007
Publisher
American Physical Society
Journal / Book Title
Physical Review Letters
Volume
127
Issue
10
Copyright Statement
© 2021 CERN, for the CMS Collaboration. Published by the American Physical Society under the terms of the Creative Commons Attribution 4.0 International license. Further distribution of this work must maintain attribution to the author(s) and the published article’s title, journal citation, and DOI. Funded by SCOAP3.
License URL
Identifier
https://www.ncbi.nlm.nih.gov/pubmed/34533355
Subjects
CMS Collaboration
hep-ex
hep-ex
nucl-ex
General Physics
01 Mathematical Sciences
02 Physical Sciences
09 Engineering
Publication Status
Published
Coverage Spatial
United States
Article Number
ARTN 102002
Date Publish Online
2021-08-31