Measurement of Bs0 meson production in pp and PbPb collisions at sNN=5.02 TeV

2019 
Abstract The production cross sections of B s 0 mesons and charge conjugates are measured in proton-proton (pp) and PbPb collisions via the exclusive decay channel B s 0 → J / ψ ϕ → μ + μ − K + K − at a center-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 T ) of the B s 0 mesons in the range of 7 to 50 GeV/c and is compared to the predictions of perturbative QCD calculations. The B s 0 production yield in PbPb collisions is measured in two p 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 AA ) is found to be 1.5 ± 0.6 ( stat ) ± 0.5 ( syst ) for 7–15 GeV/c, and 0.87 ± 0.30 ( stat ) ± 0.17 ( syst ) for 15–50 GeV/c, respectively. Within current uncertainties, the B s 0 results are consistent with models of strangeness enhancement, and suppression by parton energy loss, as observed for the B + mesons.
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