A peaking structure in the J/psi phi mass spectrum near threshold is observed in B(+/-) to 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.

Observation of a peaking structure in the J/psi phi mass spectrum from B(+/-) to J/psi phi K(+/-) decays / S. Chatrchyan, V. Khachatryan, A.M. Sirunyan, A. Tumasyan, W. Adam, T. Bergauer, M. Dragicevic, J. Ero, C. Fabjan, M. Friedl, R. Fruhwirth, V.M. Ghete, N. Hormann, J. Hrubec, M. Jeitler, W. Kiesenhofer, V. Knunz, M. Krammer, I. Krotschmer, D. Liko, et al.. - In: PHYSICS LETTERS. SECTION B. - ISSN 0370-2693. - ELETTRONICO. - 734:(2014), pp. 261-281. [10.1016/j.physletb.2014.05.055]

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

CIULLI, VITALIANO;D'ALESSANDRO, RAFFAELLO;FOCARDI, ETTORE;FROSALI, SIMONE;GONZI, SANDRO;GORI, VALENTINA;LENZI, PIERGIULIO;TROPIANO, ANTONIO;
2014

Abstract

A peaking structure in the J/psi phi mass spectrum near threshold is observed in B(+/-) to 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.
2014
734
261
281
S. Chatrchyan; V. Khachatryan; A.M. Sirunyan; A. Tumasyan; W. Adam; T. Bergauer; M. Dragicevic; J. Ero; C. Fabjan; M. Friedl; R. Fruhwirth; V.M. Ghete...espandi
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Utilizza questo identificatore per citare o creare un link a questa risorsa: https://hdl.handle.net/2158/879526
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