B-meson reconstruction performance and spectra in pp and pPb collisions in CMS

Abstract

Abstract The CMS Collaboration has recently measured the B-meson production in pPb collisions at s NN = 5.02 TeV via the reconstruction of the decays B + → J / ψ K + , B 0 → J / ψ K ⁎ ( 892 ) and B s 0 → J / ψ ϕ , with J / ψ → μ + μ − . The study of B-meson production in proton–nucleus collisions allows one to investigate the relevance of cold nuclear matter effects and, in addition, provides an important baseline for the understanding of the heavy-quark energy loss mechanisms in PbPb collisions. In proton–proton collisions, open heavy-flavour measurements at the LHC provide a way to test predictions of quantum chromodynamics at the highest available collision energies. In these proceedings, the measurements of the p T -differential cross section of B + , B 0 , B s 0 and the y -differential cross section of B + in pPb collisions at s NN = 5.02 TeV will be presented. The nuclear modification factors R pA FONLL of B + , B 0 and B s 0 , obtained by using the FONLL predictions at s = 5.02 TeV as a pp reference, will also be shown.