Search for the X(4140) state in B+→J/ψϕK+ decays with the D0 detector

UNSPECIFIED (2014) Search for the X(4140) state in B+→J/ψϕK+ decays with the D0 detector. Physical Review D, 89 (1): 012004. ISSN 1550-7998

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Abstract

We investigate the decay B+→J/ψϕK+ in a search for the X(4140) state, a narrow threshold resonance in the J/ψϕ system. The data sample corresponds to an integrated luminosity of 10.4  fb−1 of pp¯ collisions at 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±4.3(stat)±6.6(syst)  MeV and its width to be Γ=19.9±12.6(stat)+3.0−8.0(syst)  MeV.