Using Z boson events to study parton-medium interactions in Pb-Pb collisions
EntityUAM. Departamento de Física Teórica
PublisherAmerican Physical Society
10.1103/PhysRevLett.128.122301Physical Review Letters 128.12 (2022): 122301
ISSN0031-9007 (print); 1079-7114 (online)
SubjectsCenter-of-Mass Energies; Charged Hadrons; Nucleon-Nucleon; Proton Proton Collisions; Física
NoteArtículo escrito por un elevado número de autores, solo se referencian el que aparece en primer lugar, el nombre del grupo de colaboración, si le hubiere, y los autores pertenecientes a la UAM
Rights© 2022 CERN, for the CMS Collaboration
Esta obra está bajo una Licencia Creative Commons Atribución 4.0 Internacional.
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. Significant modifications in central Pb-Pb events compared to the pp reference data are also found for these observables
Google Scholar:Sirunyan, A. M. - CMS Collaboration - Albajar Molera, Carmen - Fernández Trocóniz Acha, Jorge - Reyes Almanza, Rogelio
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