May 22 – 28, 2011
Centre Bonlieu
Europe/Zurich timezone

Bottomonium production measured in PbPb and pp collisions by CMS

May 23, 2011, 7:10 PM
Salon Ravel AB (ImpErial Palace)

Salon Ravel AB

ImpErial Palace

Parallel Heavy flavor and quarkonia production Heavy flavor


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.

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