Studies of exotic quarkonium states at CMS

International Workshop on Discovery Physics at the LHC 2012

Fanfani, Alessandra^1

Dipartimento di Fisica Ed Astonomia, Viale Berti/Pichat 6/2, 40127 Bologna, Italy^1

关键词: Branching fractions;    Differential cross section;    Large data;    Mass spectra;    Pp collisions;    Quarkonium;    Quarkonium spectroscopy;    Transverse momenta;   

Others  :  https://iopscience.iop.org/article/10.1088/1742-6596/455/1/012031/pdf
DOI  :  10.1088/1742-6596/455/1/012031

来源: IOP

【 摘 要 】

Using large data samples of dimuon events in pp collisions at √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 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 ψπ+π-mass spectrum of the J/ ψπ+π-system in the X(3872) decays is also investigated. Preliminary studies on structures in the J/ψ ømass spectrum of the exclusive B+→ J/ψ øK+ decays are reported.