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Using Z Boson Events to Study Parton-Medium Interactions in Pb-Pb Collisions

CMS Collaboration; Sirunyan, A. M.; Tumasyan, A.; Adam, W.; Ambrogi, F.; Bergauer, T.; Dragicevic, M.; Erö, J.; Escalante Del Valle, A.; Frühwirth, R.; Jeitler, M.; Krammer, N.; Lechner, L.; Liko, D.; Madlener, T.; Mikulec, I.; Pitters, F. M.; Rad, N.; Schieck, J.; ... mehr

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 pT>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 pT spectra of charged particles in Z boson events, which are sensitive to medium modifications of the parton shower longitudinal structure, are also reported. ... mehr


Verlagsausgabe §
DOI: 10.5445/IR/1000145131
Veröffentlicht am 22.04.2022
Originalveröffentlichung
DOI: 10.1103/PhysRevLett.128.122301
Scopus
Zitationen: 20
Web of Science
Zitationen: 16
Dimensions
Zitationen: 18
Cover der Publikation
Zugehörige Institution(en) am KIT Institut für Astroteilchenphysik (IAP)
Institut für Experimentelle Teilchenphysik (ETP)
Institut für Prozessdatenverarbeitung und Elektronik (IPE)
Publikationstyp Zeitschriftenaufsatz
Publikationsmonat/-jahr 03.2022
Sprache Englisch
Identifikator ISSN: 0031-9007, 1079-7114
KITopen-ID: 1000145131
HGF-Programm 51.11.01 (POF IV, LK 01) Teilchenphysik
Erschienen in Physical Review Letters
Verlag American Physical Society (APS)
Band 128
Heft 12
Seiten Art.-Nr.: 122301
Bemerkung zur Veröffentlichung Gefördert durch SCOAP3
Vorab online veröffentlicht am 23.03.2022
Nachgewiesen in Web of Science
arXiv
Scopus
Dimensions
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