| Observation of a p^-p mass threshold enhancement in ψ′→ π 〉＋π^-J/ψ（J/ψ 〉 γp^-p） decay |
| |
| 引用本文： | M. Ablikim.Observation of a p^-p mass threshold enhancement in ψ′→ π 〉＋π^-J/ψ（J/ψ 〉 γp^-p） decay[J].中国物理 C,2010,34(4):421-426. |
| |
| 作者姓名： | M. Ablikim |
| |
| 作者单位： | Institute of High Energy Physics, CAS, Beijing 100049, China |
| |
| 基金项目： | Supported by Ministry of Science and Technology of China （2009CB825200）, National Natural Science Foundation of China （NSFC） （10625524, 10821063, 10825524, 10835001, 10935007）, Chinese Academy of Sciences （CAS） Large-Scale Scientific Facility Program, CAS （KJCX2-YW-N29, KJCX2-YW-N45）, 100 Talents Program of CAS; Istituto Nazionale di Fisica Nucleare, Italy, Russian Foundation for Basic Research （08-02-92221, 08-02-92200-NSFC-a）, Siberian Branch of Russian Academy of Science, joint project No 32 with CAS, Chinese University of Hong Kong Focused Investment Grant （3110031）, U. S. Department of Energy （DE-FG02-04ER41291, DE-FG02-91ER40682, DE-FG02-94ER40823）, WCU Program of National Research Foundation of Korea （R32-2008-000-10155-0）. D. Cronin-Hennessy thanks the A.P. Sloan Foundation
The BESⅢ collaboration thanks the staff of BEPCH and the computing center for their hard efforts. |
| |
| 摘 要： | The decay channel ψ′→ π 〉＋π^-J/ψ（J/ψ 〉 γp^-p） is studied using a sample of 1.06 × 10^8 ψ′ events collected by the BESIII experiment at BEPCII. A strong enhancement at threshold is observed in the p^-p invariant mass spectrum. The enhancement can be fitted with an S-wave Breit-Wigner resonance function with a resulting peak mass of M = 1861-13^＋6 （stat）-26^＋7 （syst） MeV/c^2 and a narrow width that is Г 〈 38 MeV/c^2 at the 90% confidence level. These results are consistent with published BESII results. These mass and width values do not match with well established mesons.
|
| 关 键 词： | 粒子 门槛 不变质量谱 π 衰变 amp 功能配备 维格纳 |
| 收稿时间： | 2010-1-29 |
| 本文献已被 维普 等数据库收录！ |
| 点击此处可从《中国物理 C》浏览原始摘要信息 |
| 点击此处可从《中国物理 C》下载免费的PDF全文 |
|
