Heavy flavours in heavy-ion collisions in the CMS experiment at the LHC

The CMS detector at the LHC is well suited for the study of quarkonium states J/psi psi', Upsilon Upsilon', and Upsilon'', as well as Z boson production in heavy ion collisions through their dimuon decays. The CMS detector has a large muon system with a trigger acceptance of ~20% for Upsilon and ~1% for J/psi . The precise tracker enables dimuon reconstruction with efficiencies above 90% in the barrel for dimuons from quarkonia decays, a dimuon mass resolution of 0.5% at the Upsilon mass, and background rejection. Results of quarkonium simulations are presented for several ion species with high and low background hypotheses. The expected dimuon invariant mass distributions are shown and the signal-to-background ratios, significance and the estimated statistics are also given. The CMS capability for detecting high-mass mu+ mu- pairs from semileptonic B Bbar decays and secondary J/psi’s from single B decays (useful channels for studying medium-induced bottom-quark energy loss) is also discussed.