Exotic quarkonium states in CMS experiment

Using large data samples of di-muon events, CMS can perform detailed measurements and searches for new states in the field of exotic quarkonium. We present our results on the production of prompt and non-prompt $\rm X(3872)$, detected in the ${\rm J}/\psi \pi^+\pi^-$ decay channel, which extend to higher $p_{\rm T}$ values than in any previous measurement. The cross-section ratio with respect to the $\psi(2S)$ is given differentially in $p_{\rm T}$, as well as $p_{\rm T}$ integrated. For the first time at the LHC, the fraction of $\rm X(3872)$ coming from B hadron decays has been measured. After these studies of the charmonium $\rm X$, we present a new search for its bottomonium counterpart, denoted as $\rm X_b$, based on a data sample of pp collisions at 8 TeV collected by CMS in 2012. In analogy to the $\rm X(3872)$ studies, the analysis uses the ${\rm X_b} \to \Upsilon(1S) \pi \pi$ exclusive decay channel, with the $\Upsilon(1S)$ decaying to $\mu^+ \mu^-$ pairs. No evidence for $\rm X_b$ is observed and upper limits at a confidence level of 95\% on the production cross section of $\rm X_b$ times the decay branching fraction have been set.