B to J/ψ measurement in PbPb at = 2.76 TeV using CMS

Although the RHIC experiments have measured the inclusive J/ψ and open heavy-flavor productions at = 200 GeV, no data are available yet for the contribution of secondary J/ψ from the B-hadron decays in heavy-ion collisions. Since the B-hadron and the prompt J/ψ interact with the medium differently, subtracting the non-prompt J/ψ contribution is crucial for our understanding of modifications in the prompt J/ψ production in heavy-ion collisions. It should also be a measure of b-quark energy loss. CMS is able to separate the prompt and the non-prompt J/ψ in PbPb collisions performing an unbinned two-dimensional maximum-likelihood fit to the mass and pseudo-proper decay length distributions. In this paper, the first measurement of non-prompt J/ψ production in the dimuon channel, as a function of centrality in PbPb collisions at = 2.76 TeV, is presented.