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| Observation of a p mass threshold enhancement in ψ′→π+π-J/ψ(J/ψ→γp) decay | |
| 作者单位： | Institute;High;Energy;Physics;G.I.;Budker;Nuclear;（BINP）;Guangxi;University;Science;Technology;China;Peking;Joint;Research;Carnegie;Mellon;Moscow;Nanjing;Minnesota;Bogolyubov;Theoretical;Turin;INFN;Liaoning;Zhengzhou;Shanxi;Tsinghua;Helmholtzcentre;Heavy;GmbH;D-64291;Darmstadt;Germany;Nankai;Normal;Hawaii;Graduate;Chinese;Academy;Sciences;Huazhong;Henan;Shandong;Tokyo;Universitaet;Giessen;Hong;Kong;Yat-Sen;Sichuan;Wuhan;Seoul;National;Bochum;Ruhr-University;Center;Advanced;currently;Suzhou;Hunan; |
| 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 (08-02-2221, 08-02-92200-NSFC-a);;Siberian Branch of Russian Academy of Science,joint project No 32 with CAS... |
| 摘 要： | The decay channel ψ→π+π-J/ψ(J/ψ→γp) is studied using a sample of 1.06×108 ψ events collected by the BESIII experiment at BEPCII. A strong enhancement at threshold is observed in the 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+6-13 (stat)+7-26 (syst) MeV/c2 and a narrow width that is Γ <38 MeV/c2 at the 90% confidence level. These results are consistent with published BESII results. These mass and width values... |
| 关 键 词： | p threshold enhancement |
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