Relatore
Martino Dall'Osso
(INFN - Bologna)
Descrizione
The study of the X(3872) production is the first target in ``exotic'' quarkonium spectroscopy in CMS. The X(3872) state is reconstructed in the decays to J/ψ π+π-, where the J/ψ decays to two muons. The cross-section ratio w.r.t. the ψ(2S) is measured as a function of transverse momentum, covering unprecedentedly high values of pT. For the first time at the LHC the fraction of X(3872) coming from B-hadron decays is established. From these measurements the prompt X(3872) cross section times branching fraction is extracted differentially in pT and compared with NRQCD predictions. The π+π- mass spectrum of the J/ψ π+π- system in the X(3872) decays is also investigated.
Autore principale
Martino Dall'Osso
(INFN - Bologna)
