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Observation of B mesons and measurement of the B/B yield ratio in PbPb collisions at = 5.02 TeV
Copyright © 2021 CERN, for the CMS Collaboration. The B 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. The mesons are reconstructed in the exclusive decay channels B J/KK and B J/K. The B 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 B and B is measured and compared to theoretical models that include quark recombination effects.SCOAP3