Constraints on the Initial State of Pb-Pb Collisions via Measurements of Z -Boson Yields and Azimuthal Anisotropy at √sNN=5.02 TeV
Author(s)
Abercrombie, Daniel Robert; Allen, B; Bi, Ran; Brandt, Stephanie Akemi; Busza, Wit; Cali, Ivan Amos; Chen, Y; D'Alfonso, Mariarosaria; Gomez-Ceballos, Guillelmo; Goncharov, Maxim; Harris, Philip Coleman; Hsu, D; Hu, Miao; Klute, Markus; Kovalskyi, Dmytro; Krupa, Jeffrey; Lee, Y.-J.; Luckey Jr, P David; Maier, Benedikt; Marini, A. C.; McGinn, Christopher Francis; Mironov, Camelia Maria; Narayanan, S; Niu, Xinmei; Paus, Christoph M. E.; Rankin, Dylan S.; Roland, Christof; Roland, Gunther; Shi, Z; Stephans, George S. F.; Sumorok, Konstanty C; Tatar, Kaya; Velicanu, Dragos Alexandru; Wang, J; Wang, TW; Wang, Z; Wyslouch, Boleslaw; ... Show more Show less
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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
2021Department
Massachusetts Institute of Technology. Department of Physics; Massachusetts Institute of Technology. Laboratory for Nuclear ScienceJournal
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