Observation of the Bc+ meson in Pb-Pb and pp collisions at √s NN = 5.02 TeV and measurement of its nuclear modification factor
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Type :
Article
Publication Status :
Published
Access :
Attribution 4.0 International
openAccess
http://creativecommons.org/licenses/by/4.0/
openAccess
http://creativecommons.org/licenses/by/4.0/
Abstract
The Bc+ meson is observed for the first time in heavy ion collisions. Data from the CMS detector are used to study the production of the Bc+ meson in lead-lead (Pb-Pb) and proton-proton (pp) collisions at a center-of-mass energy per nucleon pair of sNN=5.02 TeV, via the Bc+→(J/ψ→μ+μ-)μ+νμ decay. The Bc+ nuclear modification factor, derived from the Pb-Pb-to-pp ratio of production cross sections, is measured in two bins of the trimuon transverse momentum and of the Pb-Pb collision centrality. The Bc+ meson is shown to be less suppressed than quarkonia and most of the open heavy-flavor mesons, suggesting that effects of the hot and dense nuclear matter created in heavy ion collisions contribute to its production. This measurement sets forth a promising new probe of the interplay of suppression and enhancement mechanisms in the production of heavy-flavor mesons in the quark-gluon plasma.
Source :
Physical Review Letters
Date :
2022-06-21
Volume :
128
Issue :
25
Publisher :
American Physical Society
URI
http://hdl.handle.net/10679/8802https://journals.aps.org/prl/abstract/10.1103/PhysRevLett.128.252301
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