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Observation is reported for a structure near the J/ψφ threshold inB+ → J/ψφK+ decays produced in ̄ pp collisions at √ s = 1.96 TeV with a statistical significance of beyond 5 standard deviations. There are 19 ± 6 events observed for this structure at a mass of 4143 .4+2.9 −3.0(stat)± 0.6(syst) MeV/c2 and a width of 15.3+10.4 −6.1 (stat)±2.5(syst) MeV/c 2, which are consistent with the previous measurements reported as evidence of the Y (4140).

Exotic J/psi Phi Structures and Search for the Z(4430)+ State at CDF