Observation of a peaking structure in the J/psi phi mass spectrum from B-+/- -> J/psi phi K-+/- decays

Abstract

A peaking structure in the J/psi phi mass spectrum near threshold is observed in B-+/- -> J/psi phi K-+/- decays, produced in pp collisions at root s = 7 TeV collected with the CMS detector at the LHC. The data sample, selected on the basis of the dimuon decay mode of the J/psi, 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 Gamma = 28(-11)(+15) (stat.) +/- 19 (syst.) MeV, respectively. Evidence for an additional peaking structure at higher J/psi phi mass is also reported. (C) 2014 The Authors. Published by Elsevier B.V.


Tutti gli autori

  • POMPILI A.;MARANGELLI B.;CALABRIA C.;SELVAGGI G.;SINGH G.;SINGH G.;ABBRESCIA M.;DE PALMA M.;VENDITTI R.;MY S.;NUZZO S.V.;CHHIBRA S.S

Titolo volume/Rivista

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Anno di pubblicazione

2014

ISSN

0370-2693

ISBN

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Numero di citazioni Wos

76

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Numero di citazioni Scopus

84

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Settori ERC

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Codici ASJC

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