Measurement of B${}_{\mathrm{s}}^0$ meson production in pp and PbPb collisions at $\sqrt{s_{\mathrm{NN}}}=$ 5.02 TeV

Abstract

The production cross sections of B${}_{\mathrm{s}}^0$ mesons and charge conjugates are measured in proton-proton (pp) and PbPb collisions via the exclusive decay channel B${}_{\mathrm{s}}^0$ $\to$ ${\mu }^{+}{\mu }^{-}$K${}^{+}$K${}^{-}$ at a centre-of-mass energy of 5.02 TeV per nucleon pair and within the rapidity range $|y|$ $<$ 2.4 using the CMS detector at the LHC. The pp measurement is performed as a function of transverse momentum (p${}_{\mathrm{T}}$) of the B${}_{\mathrm{s}}^0$ meson in the range of 7 to 50 GeV/$c$ and is compared to the predictions of perturbative QCD calculations. The B${}_{\mathrm{s}}^0$ production yield in PbPb collisions is measured in two p${}_{\mathrm{T}}$ intervals, 7 to 15 and 15 to 50 GeV/$c$, and compared to the yield in pp collisions in the same kinematic region. The nuclear modification factor ($R_{\mathrm{AA}}$) is found to be 1.5 $\pm$ 0.6 (stat) $\pm$ 0.5 (syst) for 7-15 GeV/$c$, and 0.87 $\pm$ 0.30 (stat) $\pm$ 0.17 (syst) for 15-50 GeV/$c$, respectively. Within current uncertainties, the results are consistent with models of strangeness enhancement and a suppression as observed for the B${}^{+}$ mesons.

Replaced with the published version. Added the journal reference and the DOI. All the figures and tables can be found at http://cms-results.web.cern.ch/cms-results/public-results/publications/HIN-17-008 (CMS Public Pages)