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

V.M. Abazov , F. Badaud (1) , U. Bassler (2) , M. Besançon (2) , D. Brown (3) , E. Chapon (2) , F. Couderc (2) , F. Deliot (2) , Y. Enari (3) , S. Greder (4) , G. Grenier (5) , Ph. Gris (1) , A. Grohsjean (2) , Z. Hubacek (2) , T. Kurca (5) , P. Lebrun (5) , J. Lellouch (3) , D. Li (3) , F. Miconi (4) , I. Ripp-Baudot (4) , C. Royon (2) , V. Shary (2) , M. Titov (2) , B. Tuchming (2) , D. Vilanova (2) , L. Zivkovic (3) , G. Sajot (6) , J. Stark (6) , J.-F. Grivaz (7) , T. Guillemin (7) , M. Jaffré (7) , P. Pétroff (7) , M.-C. Cousinou (8) , A. Duperrin (8) , W. Geng (8) , E. Kajfasz (8) , S. Kermiche (8) , E. Nagy (8) , N. Osman (8)

1 LPC - Laboratoire de Physique Corpusculaire - Clermont-Ferrand
2 IRFU - Institut de Recherches sur les lois Fondamentales de l'Univers
3 LPNHE - Laboratoire de Physique Nucléaire et de Hautes Énergies
4 DRS-IPHC - Département Recherches Subatomiques
5 IPNL - Institut de Physique Nucléaire de Lyon
6 LPSC - Laboratoire de Physique Subatomique et de Cosmologie
7 LAL - Laboratoire de l'Accélérateur Linéaire
8 CPPM - Centre de Physique des Particules de Marseille

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.

Domaines: Physique des Hautes Energies - Expérience [hep-ex]

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, 2014, 89, pp.012004. ⟨10.1103/PhysRevD.89.012004⟩. ⟨in2p3-00866106⟩