Observation of a peaking structure in the J/ψϕ mass spectrum from B±→J/ψϕK± decays

Chatrchyan, Serguei; Brochero Cifuentes, Javier Andrés; Cabrillo Bartolomé, José Iban; Calderón Tazón, Alicia; Chuang, S. H.; Duarte Campderros, Jorge; Fernández García, Marcos; Gómez Gramuglio, Gervasio; González Sánchez, Francisco Javier; Graziano, Alberto; Jordá Lope, Clara; López Virto, María Amparo; Marco de Lucas, Jesús; Marco de Lucas, Rafael José; Martínez Rivero, Celso; Matorras Weinig, Francisco; Muñoz Sánchez, Francisca Javiela; Rodrigo Anoro, Teresa; Rodríguez Marrero, Ana Yaiza; Ruiz Jimeno, Alberto; Scodellaro, Luca; Vila Álvarez, Iván; Vilar Cortabitarte, Rocío

doi:10.1016/j.physletb.2014.05.055

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Identificadores

URI: http://hdl.handle.net/10902/14002

DOI: 10.1016/j.physletb.2014.05.055

ISSN: 0370-2693

ISSN: 1873-2445

Fecha

2014-06

Derechos

Atribución 3.0 España

Publicado en

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

Editorial

Elsevier

Enlace a la publicación

https://doi.org/10.1016/j.physletb.2014.05.055

Resumen/Abstract

A peaking structure in the J/ψϕ mass spectrum near threshold is observed in B±→J/ψϕK± decays, produced in pp collisions at s=7TeV collected with the CMS detector at the LHC. The data sample, selected on the basis of the dimuon decay mode of the J/ψ, corresponds to an integrated luminosity of 5.2 fb−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.)MeV and Γ=28−11+15(stat.)±19(syst.)MeV, respectively. Evidence for an additional peaking structure at higher J/ψϕ mass is also reported.

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