Observation of a Near-Threshold Enhancement in the $ω ϕ$ Mass Spectrum from the Doubly OZI-Suppressed Decay $J / ψ \to γ ω ϕ$

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27 April 2006

journal article
research article
Published by American Physical Society (APS) in Physical Review Letters

Vol. 96 (16) , 162002
https://doi.org/10.1103/physrevlett.96.162002

Abstract

An enhancement near threshold is observed in the

ω ϕ

invariant mass spectrum from the doubly Okubo-Zweig-Iizuka–suppressed decays of

J / ψ \to γ ω ϕ

, based on a sample of

5.8 \times 10^{7}

J / ψ

events collected with the BESII detector. A partial wave analysis shows that this enhancement favors

J^{P} = 0^{+}

, and its mass and width are

M = 1812_{- 26}^{+ 19} (stat) \pm 18 (syst) MeV / c^{2}

and

Γ = 105 \pm 20 (stat) \pm 28 (syst) MeV / c^{2}

. The product branching fraction is determined to be

B (J / ψ \to γ X) B (X \to ω ϕ) = [2.61 \pm 0.27 (stat) \pm 0.65 (syst)] \times 10^{- 4}

.

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