Using <mml:math xmlns:mml="http://www.w3.org/1998/Math/MathML" display="inline"><mml:mi>Z</mml:mi></mml:math> Boson Events to Study Parton-Medium Interactions in Pb-Pb Collisions
Name
PhysRevLett.128.122301.pdf
Description
Published version
Size
556.69 KB
Format
Adobe PDF
Checksum (MD5)
049d110a769cf6a985dd0627d59dc4cf
Author(s)
Harris, Philip
Date Issued
March 25, 2022
Journal
Physical Review Letters
Publisher
American Physical Society (APS)
Citation
Harris, Philip. 2022. "Using Z Boson Events to Study Parton-Medium Interactions in Pb-Pb Collisions." Physical Review Letters, 128 (12).
Version
Final published version
Abstract
The spectra measurements of charged hadrons produced in the shower of a parton originating in the same hard scattering with a leptonically decaying Z boson are reported in lead-lead nuclei (Pb-Pb) and proton-proton (pp) collisions at a nucleon-nucleon center-of-mass energy of 5.02 TeV. Both Pb-Pb and pp data sets are recorded by the CMS experiment at the LHC and correspond to an integrated luminosity of 1.7 nb^{-1} and 320 pb^{-1}, respectively. Hadronic collision data with one reconstructed Z boson candidate with the transverse momentum p_{T}>30 GeV/c are analyzed. The Z boson constrains the initial energy and direction of the associated parton. In heavy ion events, azimuthal angular distributions of charged hadrons with respect to the direction of a Z boson are sensitive to modifications of the in-medium parton shower and medium response. compared to reference data from pp interactions, the results for central Pb-Pb collisions indicate a modification of the angular correlations. The measurements of the fragmentation functions and p_{T} spectra of charged particles in Z boson events, which are sensitive to medium modifications of the parton shower longitudinal structure, are also reported. Significant modifications in central Pb-Pb events compared to the pp reference data are also found for these observables.
MIT Department
Massachusetts Institute of Technology. Department of Physics
Terms of Use
Creative Commons Attribution 4.0 International license
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DOI of Published Version
https://doi.org/10.1103/physrevlett.128.122301
