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Observation of a near-threshold enhancement in the omega(phi) mass spectrum from the doubly OZI-suppressed decay J/psi-->gamma(omega)phi |
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| Authors: | Ablikim M Bai J Z Ban Y Bian J G Cai X Chen H F Chen H S Chen H X Chen J C Chen Jin Chen Y B Chi S P Chu Y P Cui X Z Dai Y S Diao L Y Deng Z Y Dong Q F Du S X Fang J Fang S S Fu C D Gao C S Gao Y N Gu S D Gu Y T Guo Y N Guo Y Q Guo Z J Harris F A He K L He M Heng Y K Hu H M Hu T Huang G S Huang X T Ji X B Jiang X S Jiang X Y Jiao J B Jin D P Jin S Jin Yi Lai Y F Li G Li H B Li H H Li J Li R Y Li S M Li W D Li W G Li X L Li X N Li X Q Li Y L Liang Y F Liao H B Liu B J Liu C X Liu F Liu Fang Liu H H Liu H M Liu J Liu J B Liu J P Liu Q Liu R G Liu Z A Lou Y C Lu F Lu G R Lu J G Luo C L Ma F C |
| Affiliation: | Institute of High Energy Physics, Beijing 100049, People's Republic of China. |
| Abstract: | An enhancement near threshold is observed in the omega(phi) invariant mass spectrum from the doubly Okubo-Zweig-Iizuka-suppressed decays of J/psi-->gamma(omega)phi, based on a sample of 5.8 x 10(7) J/psi events collected with the BESII detector. A partial wave analysis shows that this enhancement favors JP=0+, and its mass and width are M=1812(+19)(-26)(stat)+/-18(syst) MeV/c2 and Gamma=105+/-20(stat)+/-28(syst) MeV/c2. The product branching fraction is determined to be B(J/psi-->gammaX)B(X-->omega(phi))=[2.61+/-0.27(stat)+/-0.65(syst)]x10(-4). |
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