Abstract
The process γγ→ϕJ/ψ is measured using a data sample of 825 fb−1 collected with the Belle detector. A narrow peak of 8.8−3.2+4.2 events, with a significance of 3.2 standard deviations including systematic uncertainty, is observed. The mass and natural width of the structure [named X(4350)] are measured to be [4350.6−5.1+4.6(stat)±0.7(syst)] MeV/c2 and [13−9+18(stat)±4(syst)] MeV, respectively. The product of its two-photon decay width and branching fraction to ϕJ/ψ is [6.7−2.4+3.2(stat)±1.1(syst)] eV for JP=0+, or [1.5−0.6+0.7(stat)±0.3(syst)] eV for JP=2+. No signal for the Y(4140)→ϕJ/ψ structure reported by the CDF Collaboration in B→K+ϕJ/ψ decays is observed, and limits of Γγγ(Y(4140))B(Y(4140)→ϕJ/ψ)<41 eV for JP=0+ or <6.0 eV for JP=2+ are determined at the 90% C.L. This disfavors the scenario in which the Y(4140) is a Ds*+Ds*− molecule.Received 11 December 2009DOI:https://doi.org/10.1103/PhysRevLett.104.112004©2010 American Physical Society
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