Quarkonium Physics at CMS

This article presents the determination of the $J/\psi$ and $\psi$(2S) differential cross sections in proton-proton collisions at a centre-of-mass energy of 7 TeV, as a function of transverse momentum and in several rapidity ranges, on the basis of the 2010 data collected by the CMS experiment. We also report the measurement of the differential production cross sections of $\Upsilon$(1S), $\Upsilon$(2S), and $\Upsilon$(3S) as a function of transverse momentum and rapidity.