Bottomonium production measured in PbPb and pp collisions by CMS

The LHC centre-of-mass energy allows copious $\Upsilon$ production in PbPb collisions. Detailed measurements of bottomonium production will help characterize the dense matter produced in heavy-ion collisions. The full spectroscopy of quarkonium states has been suggested as a possible thermometer for the QGP. CMS is well suited to measure $\Upsilon$ decays to muons given the muon identification and charged particle tracking capability. Using muons of transverse momentum above 4~GeV/$c$ and pseudorapidity below 2.4, the double ratio of the $\Upsilon(2S+3S)$ excited states to the $\Upsilon(1S)$ ground state in PbPb and pp collisions, $[\Upsilon(2S+3S)/\Upsilon(1S)]_{PbPb}/[\Upsilon(2S+3S)/\Upsilon(1S)]_{pp}$, is found to be $0.31^{+0.19}_{-0.15}(stat.)\pm0.03(syst.)$. The probability to obtain the measured value, or lower, if the true double ratio is unity, is calculated to be less than 1\%. $\Upsilon(1S)$ suppression in PbPb at $\sqrt{s_{NN}}=2.76$~TeV is also presented in this proceeding.