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 - INSPIRE

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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

CMS

Collaboration

Mar 25, 2021

19 pages

Published in:

Phys.Rev.Lett. 127 (2021) 10, 102002

Published: Aug 31, 2021

e-Print:

2103.14089 [hep-ex]

DOI:

10.1103/PhysRevLett.127.102002 (publication)

Report number:

CMS-HIN-19-003,
CERN-EP-2021-039

Experiments:

CERN-LHC-CMS

View in:

reference search34 citations

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Abstract: (APS)

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 nucleonnucleon 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.

Note:

Replaced with the published version. Added the journal reference and the DOI. All the figures and tables can be found at http://cms-results.web.cern.ch/cms-results/public-results/publications/HIN-19-003 (CMS Public Pages)

heavy ion: scattering
lead
model: Glauber
angular distribution: anisotropy
Z0: yield
elliptic flow
Z0: leptonic decay
differential cross section: measured
initial state
geometry

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See Supplemental Material at http://link.aps.org/supplemental/10.1103/PhysRevLett.127.102002 for values of TAA as a function of centrality

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