Observation of Bs0 Mesons and Measurement of the Bs0/B+ Yield Ratio in PbPb Collisions at √snn = 5.02 TeV
Physics Letters B 2022
Viesturs Veckalns

The Bs0 and B+ production yields are measured in PbPb collisions at a center-of-mass energy per nucleon pair of 5.02 TeV. The data sample, collected with the CMS detector at the LHC, corresponds to an integrated luminosity of 1.7 nb−1. The mesons are reconstructed in the exclusive decay channels B→s0J/ψ(μ+μ−)ϕ(K+K−) and B→+J/ψ(μ+μ−)K+, in the transverse momentum range 7–50 GeV/c and absolute rapidity 0–2.4. The Bs0 meson is observed with a statistical significance in excess of five standard deviations for the first time in nucleus-nucleus collisions. The measurements are performed as functions of the transverse momentum of the B mesons and of the PbPb collision centrality. The ratio of production yields of Bs0 and B+ is measured and compared to theoretical models that include quark recombination effects.


Atslēgas vārdi
B mesons | CMS | Hadronization | Heavy flavor | Quark gluon plasma
DOI
10.1016/j.physletb.2022.137062
Hipersaite
https://www.sciencedirect.com/science/article/pii/S0370269322001964?via%3Dihub

The CMS Collaboration, A.Tumasyan, W.Adam, V.Veckalns... [et al.]. Observation of Bs0 Mesons and Measurement of the Bs0/B+ Yield Ratio in PbPb Collisions at √snn = 5.02 TeV. Physics Letters B, 2022, Vol. 829, Article number 137062. ISSN 0370-2693. Available from: doi:10.1016/j.physletb.2022.137062

Publikācijas valoda
English (en)
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