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An enhancement near threshold is observed in the \omega \phi invariant massspectrum from the doubly OZI suppressed decays of J/\psi \to \gamma \omega\phi, based on a sample of 5.8 X 10^7 J/\psi events collected with the BESIIdetector. A partial wave analysis shows that this enhancement favors J^P = 0^+,and its mass and width are M = 1812^{+19}_{-26} (stat) +- 18 (syst) MeV/c^2 and\Gamma = 105+-20 (stat) +- 28$ (syst) MeV/c^2. The product branching fractionis determined to be B(J/\psi\to \gamma X) B(X\to\omega\phi) = (2.61 +- 0.27(stat) +- 0.65$ (syst)) X 10^{-4}.Comment: Accepted by PRL, the version to be appeared in PR

physical review letters

Observation of a Near-Threshold Enhancement in the<mml:math xmlns:mml="http://www.w3.org/1998/Math/MathML" display="inline"><mml:mi>ω</mml:mi><mml:mi>ϕ</mml:mi></mml:math>Mass Spectrum from the Doubly OZI-Suppressed Decay<mml:math xmlns:mml="http://www.w3.org/1998/Math/MathML" display="inline"><mml:mi>J</mml:mi><mml:mo>/</mml:mo><mml:mi>ψ</mml:mi><mml:mo>→</mml:mo><mml:mi>γ</mml:mi><mml:mi>ω</mml:mi><mml:mi>ϕ</mml:mi></mml:math>

Observation of a Near-Threshold Enhancement in theωϕMass Spectrum from the Doubly OZI-Suppressed DecayJ/ψ→γωϕ