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Observation of a peaking structure in the J/?? mass spectrum from B±?J/??K± decays

Abstract: A peaking structure in the J/?fmass spectrum near threshold is observed in B±?J/?fK±decays, produced in pp collisions at vs=7TeVcollected with the CMS detector at the LHC. The data sample, selected on the basis of the dimuon decay mode of the J/?, corresponds to an integrated luminosity of 5.2fb-1. Fitting the structure to an S-wave relativistic Breit–Wigner lineshape above a three-body phase-space nonresonant 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.) MeVand G=28+15-11(stat.) ±19 (syst.) MeV, respectively. Evidence for an additional peaking structure at higher J/?fmass is also reported.

Otras publicaciones de la misma revista o congreso con autores/as de la Universidad de Cantabria

 Fuente: Physics Letters B, Vol. 734, Pp 261–281, (2014)

Editorial: Elsevier

 Fecha de publicación: 01/06/2014

Nº de páginas: 21

Tipo de publicación: Artículo de Revista

 DOI: 10.1016/j.physletb.2014.05.055

ISSN: 0370-2693,1873-2445

Proyecto español: FPA2014-55295-C3-1-R ; FPA 2011-28694-C02-01

Url de la publicación: https://doi.org/10.1016/j.physletb.2014.05.055