Multiplicity and transverse momentum dependence of charge-balance functions in pPb and PbPb collisions at LHC energies

Belyaev, A.; Boos, E.E.; Demiyanov, A.; Ershov, A.A.; A, G.; Khein, L.; Kodolova, O.L.; Korotkikh, V.L.; Obraztsov, S.V.; Petrushanko, S.V.; Savrin, V.I.; Snigirev, A.M.; Vardanyan, I.; CMS, C.

Авторы: Belyaev Andrey, Boos E.E., Demiyanov A., Ershov A.A., A Gribushin, Khein L., Kodolova O.L., Korotkikh V.L., Obraztsov S.V., Petrushanko S.V., Savrin V.I., Snigirev A.M., Vardanyan I., CMS Collaboration
Журнал: Journal of High Energy Physics
Том: 2024
Год издания: 2024
Издательство: IOP Publishing
Местоположение издательства: [Bristol, UK], England
Номер статьи: 148
DOI: 10.1007/JHEP08(2024)148
Аннотация: Measurements of the charge-dependent two-particle angular correlation function in proton-lead (pPb) collisions at a nucleon-nucleon center-of-mass energy of √sNN= 8.16 TeV and lead-lead (PbPb) collisions at √sNN= 5.02 TeV are reported. The pPb and PbPb datasets correspond to integrated luminosities of 186 nb−1 and 0.607 nb−1, respectively, and were collected using the CMS detector at the CERN LHC. The charge-dependent correlations are characterized by balance functions of same- and opposite-sign particle pairs. The balance functions, which contain information about the creation time of charged particle pairs and the development of collectivity, are studied as functions of relative pseudorapidity (Δη) and relative azimuthal angle (Δϕ), for various multiplicity and transverse momentum (pT) intervals. A multiplicity dependence of the balance function is observed in Δη and Δϕ for both systems. The width of the balance functions decreases towards high-multiplicity collisions in the momentum region <2 GeV, for pPb and PbPb results. No multiplicity dependence is observed at higher transverse momentum. The data are compared with HYDJET, HIJING and AMPT generator predictions, none of which capture completely the multiplicity dependence seen in the data.
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Multiplicity and transverse momentum dependence of charge-balance functions in pPb and PbPb collisions at LHC energiesстатья

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