Studies Of Exotic Quarkonium States At Cms

Using large data samples of dimuon events in pp collisions at root s = 7TeV, CMS has performed studies in the field of "exotic" quarkonium spectroscopy. The production of the X(3872) is studied measuring the ratio of the X(3872) and psi(2S) cross sections times their branching fractions into J/psi pi(+)pi(-) as a function of transverse momentum (p(T)). In addition, the fraction of X(3872) originating from B decays is determined. From these measurements the prompt X(3872) differential cross section times branching fraction as a function of p(T) is extracted. The pi(+)pi(-) mass spectrum of the J/psi pi(+)pi(-) system in the X(3872) decays is also investigated. Preliminary studies on structures in the J/psi phi mass spectrum of the exclusive B+ --> J/psi phi K+ decays are reported.