CMS-PAS-HIN-19-011

CMS-PAS-HIN-19-011
Measurement of $\mathrm{B_s^0}$ and $\mathrm{B^+}$ meson yields in PbPb collisions at ${\sqrt {\smash [b]{s_{_{\mathrm {NN}}}}}} =$ 5.02 TeV
CMS Collaboration
June 2020

Abstract: The $\mathrm{B_s^0}$ and $\mathrm{B^+}$ production cross sections are measured in PbPb collisions at a center-of-mass energy per nucleon pair of 5.02 TeV. The data sample, collected by 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 $\mathrm{B_s^0}\rightarrow{J}/\psi\,\phi(1020)$ and $\mathrm{B^+}\rightarrow{J}/\psi\,K^{+}$ . The $\mathrm{B_s^0}$ meson is observed with a statistical significance in excess of 5 standard deviations for the first time in nucleus-nucleus collisions. The measurements are performed as a function of the transverse momentum of the B mesons, in the interval 7-50 GeV $/c$ , and of the PbPb collision centrality. The ratio of production yields of $\mathrm{B_s^0}$ and $\mathrm{B^+}$ is also presented.
Links: CDS record (PDF) ; inSPIRE record ; CADI line (restricted) ; These preliminary results are superseded in this paper, Submitted to PLB. The superseded preliminary plots can be found here.

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