Publication: Observation of Bs0 mesons and measurement of the Bs0/B+ yield ratio in PbPb collisions at [Formula presented] TeV
Дата
2022
Авторы
Tumasyan, A.
Adam, W.
Ambrogi, F.
Bergauer, T.
Chistov, R.
Danilov, M.
Oskin, A.
Parygin, P.
Polikarpov, S.
Matveev, V.
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© 2022 The Author(s)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.
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Observation of Bs0 mesons and measurement of the Bs0/B+ yield ratio in PbPb collisions at [Formula presented] TeV / Tumasyan, A. [et al.] // Physics Letters, Section B: Nuclear, Elementary Particle and High-Energy Physics. - 2022. - 829. - 10.1016/j.physletb.2022.137062