Eur. Phys. J. C (2008) 53: 15-20
https://doi.org/10.1140/epjc/s10052-007-0467-4

Regular Article - Experimental Physics

Study of J/ψ decaying into ωpp̄

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

^* e-mail: liubj@mail.ihep.ac.cn

Received: 29 October 2007
Published online: 16 November 2007

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.