期刊
PHYSICAL REVIEW LETTERS
卷 117, 期 4, 页码 -出版社
AMER PHYSICAL SOC
DOI: 10.1103/PhysRevLett.117.042002
关键词
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资金
- National Key Basic Research Program of China [2015CB856700]
- National Natural Science Foundation of China (NSFC) [11235011, 11322544, 11335008, 11425524]
- Chinese Academy of Sciences (CAS) Large-Scale Scientific Facility Program
- CAS Center for Excellence in Particle Physics (CCEPP)
- Collaborative Innovation Center for Particles and Interactions (CICPI)
- NSFC [U1232201, U1332201, U1532257, U1532258]
- CAS [U1232201, U1332201, U1532257, U1532258, KJCX2-YW-N29, KJCX2-YW-N45]
- 100 Talents Program of the CAS
- National 1000 Talents Program of China
- Shanghai Key Laboratory for Particle Physics and Cosmology
- Istituto Nazionale di Fisica Nucleare, Italy
- Koninklijke Nederlandse Akademie van Wetenschappen (KNAW) [530-4CDP03]
- Ministry of Development of Turkey [DPT2006K-120470]
- Swedish Research Council
- U.S. Department of Energy [DE-FG02-05ER41374, DE-SC-0010504, DE-SC0012069]
- U.S. National Science Foundation
- University of Groningen (RuG)
- WCU Program of the National Research Foundation of Korea [R32-2008-000-10155-0]
- INPAC
- Helmholtzzentrum fuer Schwerionenforschung GmbH (GSI), Darmstadt
- U.S. Department of Energy (DOE) [DE-SC0012069] Funding Source: U.S. Department of Energy (DOE)
Using 1.09 x 10(9) J/psi events collected by the BESIII experiment in 2012, we study the J / psi -> gamma eta'pi(+)pi(-) process and observe a significant abrupt change in the slope of the eta'pi(+)pi(-) invariant mass distribution at the proton-antiproton (p (p) over bar) mass threshold. We use two models to characterize the eta'pi(+)pi(-) line shape around 1.85 GeV/c(2): one that explicitly incorporates the opening of a decay threshold in the mass spectrum (Flatte formula), and another that is the coherent sum of two resonant amplitudes. Both fits show almost equally good agreement with data, and suggest the existence of either a broad state around 1.85 GeV/c(2) with strong couplings to the c final states or a narrow state just below the p (p) over bar mass threshold. Although we cannot distinguish between the fits, either one supports the existence of a p (p) over bar moleculelike state or bound state with greater than 7 sigma significance.
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