Journal
CHINESE PHYSICS C
Volume 34, Issue 4, Pages 421-426Publisher
IOP PUBLISHING LTD
DOI: 10.1088/1674-1137/34/4/001
Keywords
p(p)over-bar; threshold enhancement
Categories
Funding
- 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 [KJCX2-YW-N29, KJCX2-YW-N45]
- Istituto Nazionale di Fisica Nucleare, Italy
- Russian Foundation for Basic Research [08-02-92221, 08-02-92200-NSFC-a]
- Chinese University of Hong Kong Focused Investment [3110031]
- U.S. Department of Energy [DE-FG02-04ER41291, DE-FG02-91ER40682, DE-FG02-94ER40823]
- National Research Foundation of Korea [R32-2008-000-10155-0]
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The decay channel psi' -> pi(+)pi(-)J/psi(J/psi -> gamma p (p) over bar) is studied using a sample of 1.06 x 10(8) psi' events collected by the BESIII experiment at BEPCII. A strong enhancement at threshold is observed in the pp 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 Gamma < 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.
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