Open and closed heavy-flavour suppression in heavy-ion collisions with CMS

The Compact Muon Solenoid (CMS) is fully equipped to measure quarkonia in the di-muon decay channel in the high multiplicity environment of nucleus-nucleus collisions. Quarkonia are especially relevant for studying the quark-gluon plasma since they are produced at early times and propagate through the medium, mapping its evolution. CMS has measured the nuclear modification factors of non-prompt $J/\psi$ (from b-hadron decays), prompt $J/\psi$, inclusive $\psi$(2S), and the first three $Y$ states in PbPb collisions at $\sqrt{s_{NN}}$ = 2.76 TeV. A suppression of non-prompt $J/\psi$, which is sensitive to the in-medium b-quark energy loss, has been measured at relatively high $p_{T}$ $(6.5 < p_{T} < 30 GeV/c)$ in PbPb collisions, compared to the yield in pp collisions scaled by the number of inelastic nucleon-nucleon collisions. For prompt $J/\psi$ in the same kinematic range, a strong, centrality-dependent suppression is observed. Such strong suppression at high $p_{T}$ has previously not been observed at RHIC. At mid-rapidity and high $p_{T}$, $\psi$(2S) show an even stronger suppression than $J/\psi$. Furthermore, CMS has measured the suppression of the three $Y$ states, separately, down to $p_{T}$ = 0. A clear ordering of the suppression with binding energy is observed, as expected from sequential melting