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

0434093 - FZÚ 2015 RIV US eng J - Článek v odborném periodiku
Abazov, V. M. - Abbott, B. - Acharya, B.S. - Kupčo, Alexander - Lokajíček, Miloš … celkem 359 autorů
Search for the X(4140) state in B+->J/psi phi K⁺ decays with the D0 detector.
Physical Review D: Particles, Fields, Gravitation and Cosmology. Roč. 89, č. 1 (2014), "012004-1"-"012004-8". ISSN 1550-7998
Grant CEP: GA MŠMT(CZ) LG12006
Institucionální podpora: RVO:68378271
Klíčová slova: D0 * B decay * J/psi(3100) * Batavia TEVATRON Coll * branching ratio * enhancement * statistical
Kód oboru RIV: BF - Elementární částice a fyzika vys. energií
Impakt faktor: 4.643, rok: 2014

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.
Trvalý link: http://hdl.handle.net/11104/0238236