Observation of χc2 →η′η′ and χc0,2 →ηη′

• 摘要：

  Using a sample of 448.1×106 ψ(3686) events collected with the BESIII detector in 2009 and 2012, we study the decays χc0,2→η′η′ and ηη′. The decays χc2→η′η′, χc0→ηη′ and χc2→ηη′ are observed for the first time with statistical significances of 9.6σ, 13.4σ and 7.5σ, respectively. The branching fractions are determined to be B(χc0→η′η′)=(2.19±0.03±0.14)×10-3, B(χc2→η′η′)=(4.76±0.56±0.38)×10-5, B(χc0→ηη′)=(8.92±0.84±0.65)×10-5 and B(χc2→ηη′)=(2.27±0.43±0.25)×10-5, where the first uncertainties are statistical and the second are systematic. The precision for the measurement of B(χc0→η′η′) is significantly improved compared to previous measurements. Based on the measured branching fractions, the role played by the doubly and singly Okubo-Zweig-Iizuka disconnected transition amplitudes for χc0,2 decays into pseudoscalar meson pairs can be clarified.

• 作者：

  M. Ablikim;M. N. Achasov;S. Ahmed;M. Albrecht;A. Amoroso;F. F. An;琪 安;J. Z. Bai;Y. Bai;O. Bakina;R. Baldini Ferroli;Y. Ban;D. W. Bennett;J. V. Bennett;N. Berger;M. Bertani;D. Bettoni;J. M. Bian;F. Bianchi;E. Boger;I. Boyko;R. A. Briere;H. Cai;X. Cai;旭荣 陈;燎原 董;双世 房;立波 郭;性涛 黄;钢 李;海波 李;卫东 李;晓磊 李;前 刘;翔 刘;加伦 平;建国 陈;肖雁 沈;洁琬 孙;昌建 唐;贻芳 王;政 王;志勇 汪;振军 肖;铭汉 叶;长征 苑;宏浩 张;尧 张;政国 赵;阳恒 郑

• 刊名：

  Physical Review D

• 在线出版时间：

  2017-12-18