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

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 sqrt(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 inverse femtobarns. 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.
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http://hal.in2p3.fr/in2p3-00869407
Contributor : Dominique Girod <>
Submitted on : Thursday, October 3, 2013 - 11:15:04 AM
Last modification on : Friday, June 5, 2020 - 10:52:07 AM

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S. Chatrchyan, M. Besancon, S. Choudhury, F. Couderc, M. Dejardin, et al.. Observation of a peaking structure in the J/psi phi mass spectrum from B+/- to J/psi phi K+/- decays. Physics Letters B, Elsevier, 2014, 734, pp.261. ⟨10.1016/j.physletb.2014.05.055⟩. ⟨in2p3-00869407⟩

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