baryonic decays branching fraction alpha distribution

作     者：阿布里克木·麦迪娜 白景芝 白羽 班勇 蔡啸 陈宏芳 陈和生 陈江川 陈进 陈元柏 初元萍 戴又善 邓子艳 杜书先 方建 傅成栋 高原宁 顾运厅 郭子敬 何康林 何瑁 衡月昆 胡海明 胡涛 黄光顺 黄性涛 黄燕萍 季晓斌 江晓山 焦健斌 金大鹏 金山 李刚 李海波 李金 李蕾 李仁英 李卫东 李卫国 李晓玲 李小男 李学潜 梁勇飞 刘北江 刘春秀 刘芳 刘峰 刘宏邦 刘怀民 刘觉平 刘倩 刘荣光 刘振安 吕峰 鲁公儒 吕军光 罗成林 马凤才 马海龙 马秋梅 毛泽普 莫晓虎 聂晶 平荣刚 邱进发 荣刚 阮向东 单连友 尚雷 沈成平 沈肖雁 盛华义 孙海生 孙胜森 孙永昭 孙志嘉 唐晓 田俊平 万霞 王岚 王亮亮 王灵淑 王平 王佩良 王贻芳 王铮 王至勇 魏诚林 魏代会 吴宁 许国发 徐新平 徐晔 阎沐霖 杨洪勋 杨明 杨永栩 叶铭汉 叶云秀 喻纯旭 苑长征 袁野 曾云 张丙新 张炳云 张长春 张达华 张华桥 章红宇 张家文 张建勇 张学尧 张一云 张子平 赵京伟 赵明刚 赵平平 赵政国 郑波 郑海青 郑建平 郑志鹏 钟彬 周莉 朱科军 朱启明 朱兴旺 朱永生 朱自安 邹冰松 

作者机构：Institute of High Energy Physics Peking University University of Science and Technology of China Zhejiang University Zhengzhou University Tsinghua University Guangxi University University of HawaiiHonolulu Johns Hopkins University Shandong University Centre for High Energy PhysicsUniversity of the Punjab Nankai University Sichuan University Huazhong Normal University Wuhan University Graduate University of Chinese Academy of Sciences Henan Normal University Nanjing Normal University Liaoning University Seoul National University Nagoya University Guangxi Normal University Soochow University China Center of Advanced Science and Technology  25. Hunan University 

出 版 物：《Chinese Physics C》 (中国物理C（英文版）)

年 卷 期：2012年第36卷第11期

页      面：1040-1045页

核心收录：

学科分类：07[理学] 070202[理学-粒子物理与原子核物理] 0702[理学-物理学] 

基　　金：Supported by National Natural Science Foundation of China (10491300  10225524  10225525  10425523  10625524  10521003  10821063  10825524)  Chinese Academy of Sciences (KJ 95T-03)  100 Talents Program of CAS (U-11  U-24  U-25)  Knowledge Innovation Project of CAS (U-602  U-34 (IHEP))  National Natural Science Foundation of China (10775077  10225522) (Tsinghua University)  and Department of Energy (DE-FG02-04ER41291) (U. Hawaii) 

主　　题：upper limit first evidence significance level branching fraction 

摘      要：The decay ψ（2S）→Ω-Ω＋ is analyzed using 14×106 ψ（2S） events recorded by the Beijing Spectrometer Ⅱ （BESⅡ） at the Beijing Electron Positron Collider （BEPC）. Based upon events with no missing charged tracks and a satisfactory four-constraint kinematic t, we determine the upper limit for the branching fraction of ψ（2S）→Ω-Ω＋ to be 1.5×104 at a 90% confidence level. By including events with one missing charged track, we are able to report the first evidence of an Ω＋ signal with a statistical signi cance of 3.1｜σ. The branching fraction of ψ（2S）Ω＋ is determined to be （4.80±1.56（stat）±1.30（sys））105.