The Bs 0 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 Bs 0 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 Bs 0 and B+ is measured and compared to theoretical models that include quark recombination effects.

Tumasyan, A., Adam, W., Ambrogi, F., Bergauer, T., Dragicevic, M., Ero, J., et al. (2022). Observation of Bs 0 mesons and measurement of the Bs 0/B+ yield ratio in PbPb collisions at [Formula presented] TeV. PHYSICS LETTERS. SECTION B, 829 [10.1016/j.physletb.2022.137062].

Observation of Bs 0 mesons and measurement of the Bs 0/B+ yield ratio in PbPb collisions at [Formula presented] TeV

Xiao J.;Benaglia A.;Beschi A.;Brivio F.;Cetorelli F.;Ciriolo V.;De Guio F.;Dinardo M. E.;Ghezzi A.;Govoni P.;Guzzi L.;Malberti M.;Monti F.;Moroni L.;Paganoni M.;Ragazzi S.;Tabarelli de Fatis T.;Valsecchi D.;Zuolo D.;Ortona G.;Massironi A.;Pigazzini S.;Gerosa R.;Lucchini M. T.;
2022

Abstract

The Bs 0 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 Bs 0 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 Bs 0 and B+ is measured and compared to theoretical models that include quark recombination effects.
Articolo in rivista - Articolo scientifico
B mesons; CMS; Hadronization; Heavy flavor; Quark gluon plasma;
English
2022
829
137062
none
Tumasyan, A., Adam, W., Ambrogi, F., Bergauer, T., Dragicevic, M., Ero, J., et al. (2022). Observation of Bs 0 mesons and measurement of the Bs 0/B+ yield ratio in PbPb collisions at [Formula presented] TeV. PHYSICS LETTERS. SECTION B, 829 [10.1016/j.physletb.2022.137062].
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Utilizza questo identificativo per citare o creare un link a questo documento: https://hdl.handle.net/10281/429460
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