Exotic quarkonimum states in CMS

The studies of the production of the X ( 3872 ) , either prompt or from B hadron decays, and of the J / ψφ mass spectrum in B hadron decays have been carried out by using pp collisions at √ s = 7 TeV collected with the CMS detector at the LHC. The cross-section ratio of the X ( 3872 ) with respect to the ψ ( 2 S ) in the J / ψπ + π − decay chan- nel and the fraction of X ( 3872 ) coming from B-hadron decays are measured as a function of transverse momentum ( p T ), covering unprecedentedly high values of p T . For the first time, the prompt X ( 3872 ) cross section times branching fraction is extracted differentially in p T and com- pared with NRQCD predictions. The dipion invariant-mass spectrum of the J / ψπ + π − system in the X ( 3872 ) decay is also investigated. A peaking structure in the J / ψφ mass spectrum near threshold is observed in B ± → J / ψφ K ± decays. The data sample, selected on the basis of the dimuon decay mode of the J / ψ , corre- sponds to an integrated luminosity of 5 . 2 fb − 1 . Fitting the structure to an S-wave relativistic Breit-Wigner line shape above a three-body phase-space non resonant component gives a signal statistical significance exceeding five standard deviations. The fitted mass and width values are m = 4148 . 0 ± 2 . 4 ( stat . ) ± 6 . 3 ( syst . ) MeV and Γ = 28 + 15 − 11 ( stat . ) ± 19 ( syst . ) MeV, respec- tively. Evidence for an additional peaking structure at higher J / ψφ mass is also reported.