Zhen Hu (Purdue University)
The LHC centre-of-mass energy allows copious $\Upsilon$ production in PbPb collisions. Detailed measurements of bottomonium will help characterize the dense matter produced in heavy-ion collisions beyond what was accessible at RHIC (mostly) with charmonia. The full spectroscopy of quarkonium states has been suggested as a possible thermometer for the QGP. With its excellent dimuon mass resolution, CMS has measured the three $\Upsilon$ states in pp collisions. With the 2010 PbPb data sample, CMS has observed the $\Upsilon$. The $\Upsilon(1S)$ cross-section is presented as a function of transverse momentum, rapidity and centrality.
Collaboration CMS (UCLouvain)