Studies of exotic quarkonium states at CMS

none1noUsing large data samples of dimuon events in pp collisions at TeV, 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 ψ(2S) cross sections times their branching fractions into J/ψπ+π− as a function of transverse momentum (pT). 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 pT is extracted. The π+π− mass spectrum of the J/ψπ+π− system in the X(3872) decays is also investigated. Preliminary studies on structures in the J/ψphi mass spectrum of the exclusive B+ → J/ψphiK+ decays are reported.noneAlessandra FanfaniAlessandra Fanfan