Bottom quark energy loss and hadronization with B+ and B0 s nuclear modification factors using pp and PbPb collisions at √sNN = 5.02 TeV

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: 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: 2025
Год издания: 2025
Издательство: IOP Publishing
Местоположение издательства: [Bristol, UK], England
Номер статьи: 195
DOI: 10.1007/JHEP02(2025)195
Аннотация: The production cross sections of B0 s and B+ mesons are reported in proton-proton (pp) collisions recorded by the CMS experiment at the CERN LHC with a center-of-mass energy of 5.02 TeV. The data sample corresponds to an integrated luminosity of 302 pb−1. The cross sections are based on measurements of the B0 s → J/ψ(μ+μ−)ϕ(1020)(K+K−) and B+ → J/ψ(μ+μ−)K+ decay channels. Results are presented in the transverse momentum (pT) range 7–50 GeV/c and the rapidity interval |y| < 2.4 for the B mesons. The measured pT-differential cross sections of B+ and B0 s in pp collisions are well described by fixed-order plus next-to-leading logarithm perturbative quantum chromodynamics calculations. Using previous PbPb collision measurements at the same nucleon-nucleon center-of-mass energy, the nuclear modification factors, RAA, of the B mesons are determined. For pT > 10 GeV/c, both mesons are found to be suppressed in PbPb collisions (with RAA values significantly below unity), with less suppression observed for the B0 s mesons. In this pT range, the RAA values for the B+ mesons are consistent with those for inclusive charged hadrons and D0 mesons. Below 10 GeV/c, both B+ and B0 s are found to be less suppressed than either inclusive charged hadrons or D0 mesons, with the B0 s RAA value consistent with unity. The RAA values found for the B+ and B0 s are compared to theoretical calculations, providing constraints on the mechanism of bottom quark energy loss and hadronization in the quark-gluon plasma, the hot and dense matter created in ultrarelativistic heavy ion collisions.
Добавил в систему: Петрушанко Сергей Владимирович

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Bottom quark energy loss and hadronization with B+ and B0 s nuclear modification factors using pp and PbPb collisions at √sNN = 5.02 TeVстатья Исследовательская статья

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