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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.

 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

Autoría

CHATRCHYAN, SERGUEI

JAVIER ANDRES BROCHERO CIFUENTES

SHANHUEI CHUANG

MARCOS FERNANDEZ GARCIA

CLARA JORDA LOPE

MARIA AMPARO LOPEZ VIRTO

RAFAEL JOSE MARCO DE LUCAS

FRANCISCA JAVIELA MUÑOZ SANCHEZ

ANA YAIZA RODRIGUEZ MARRERO