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Constraints on the Initial State of Pb-Pb Collisions via Measurements of Z -Boson Yields and Azimuthal Anisotropy at √sNN=5.02 TeV
Name
PhysRevLett.127.102002.pdf
Description
Published version
Size
588.21 KB
Format
Adobe PDF
Checksum (MD5)
5c13067baa02952f34ac79dfc4cac805
Author(s)
Harris, Philip
Date Issued
2021
Journal
Physical Review Letters
Publisher
American Physical Society (APS)
Citation
Harris, Philip. 2021. "Constraints on the Initial State of Pb-Pb Collisions via Measurements of Z -Boson Yields and Azimuthal Anisotropy at √sNN=5.02 TeV." Physical Review Letters, 127 (10).
Version
Final published version
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.
Terms of Use
Creative Commons Attribution 4.0 International license
Persistent DSpace Link
DOI of Published Version
10.1103/PHYSREVLETT.127.102002
