Study of J/ψ decaying into ωpp? |
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| Institution: | (1) Institute of High Energy Physics, Beijing, 100049, P.R. China;(2) China Center for Advanced Science and Technology (CCAST), Beijing, 100080, P.R. China;(3) Guangxi Normal University, Guilin, 541004, P.R. China;(4) Guangxi University, Nanning, 530004, P.R. China;(5) Henan Normal University, Xinxiang, 453002, P.R. China;(6) Huazhong Normal University, Wuhan, 430079, P.R. China;(7) Hunan University, Changsha, 410082, P.R. China;(8) Liaoning University, Shenyang, 110036, P.R. China;(9) Nanjing Normal University, Nanjing, 210097, P.R. China;(10) Nankai University, Tianjin, 300071, P.R. China;(11) Peking University, Beijing, 100871, P.R. China;(12) Shandong University, Jinan, 250100, P.R. China;(13) Sichuan University, Chengdu, 610064, P.R. China;(14) Tsinghua University, Beijing, 100084, P.R. China;(15) University of Hawaii, Honolulu, HI 96822, USA;(16) University of Science and Technology of China, Hefei, 230026, P.R. China;(17) Wuhan University, Wuhan, 430072, P.R. China;(18) Zhejiang University, Hangzhou, 310028, P.R. China |
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| Abstract: | The decay J/ψ→ωpp̄ is studied using a 5.8×107 J/ψ event sample accumulated with the BES II detector at the Beijing Electron–Positron Collider. The decay branching fraction
is measured to be B(J/ψ→ωpp̄)=(9.8±0.3±1.4)×10-4. No significant enhancement near the pp̄ mass threshold is observed, and an upper limit of B(J/ψ→ωX(1860))B(X(1860)→pp̄)<1.5×10-5 is determined at the 95% confidence level, where X(1860) designates the near-threshold enhancement seen in the pp̄ mass spectrum
in J/ψ→γpp̄ decays. |
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