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Search for the X(4140) state in B+->J/psi phi K+ decays with the D0 detector

Abstract : We investigate the decay B^+ -> J/psi phi K^+ in a search for the X(4140) state, a narrow threshold resonance in the J/psi phi system. The data sample corresponds to an integrated luminosity of 10.4 fb^{-1} of ppbar collisions at sqrt s =1.96 TeV collected by the D0 experiment at the Fermilab Tevatron collider. We observe a mass peak with a statistical significance of 3.1 standard deviations and measure its invariant mass to be M=4159.0 +-.3 (stat) +- 6.6 (syst) MeV and its width to be Gamma= 19.9+-12.6 (stat)}^{+1.0}_{-8.0} (syst) MeV. Identifying this mass peak as the X(4140), we measure, for M(J/psi phi) <4.59 GeV, the relative branching fraction B_rel= B(B^+ -> X(4140) K^+)/ B(B^+ ->J/psi phi K^+) to be 21+-8 (stat) +- 4 (syst)%. In addition, the data can accommodate the presence of a second enhancement at a mass of 4328.5+- 12.0 MeV.
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Contributor : Sylvie Flores <>
Submitted on : Thursday, September 26, 2013 - 7:36:57 AM
Last modification on : Thursday, February 25, 2021 - 10:58:31 AM

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V.M. Abazov, F. Badaud, U. Bassler, M. Besançon, D. Brown, et al.. Search for the X(4140) state in B+->J/psi phi K+ decays with the D0 detector. Physical Review D, American Physical Society, 2014, 89, pp.012004. ⟨10.1103/PhysRevD.89.012004⟩. ⟨in2p3-00866106⟩



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