期刊
PHYSICAL REVIEW LETTERS
卷 110, 期 25, 页码 -出版社
AMER PHYSICAL SOC
DOI: 10.1103/PhysRevLett.110.252002
关键词
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资金
- MEXT (Japan)
- JSPS (Japan)
- Nagoya's TLPRC (Japan)
- ARC (Australia)
- DIISR (Australia)
- NSFC (China)
- MSMT (Czechia)
- DST (India)
- INFN (Italy)
- MEST of KISTI
- NRF of KISTI
- GSDC of KISTI
- WCU (Korea)
- MNiSW (Poland)
- NCN (Poland)
- MES (Russia)
- RFAAE (Russia)
- ARRS (Slovenia)
- SNSF (Switzerland)
- NSC (Taiwan)
- MOE (Taiwan)
- DOE (USA)
- NSF (USA)
- MEXT for Science Research on Innovative Areas (Elucidation of New Hadrons with a Variety of Flavors'')
- JSPS KAKENHI Grant [24740158]
- Grants-in-Aid for Scientific Research [24740158, 21105002] Funding Source: KAKEN
- Science and Technology Facilities Council [ST/K003410/1] Funding Source: researchfish
- STFC [ST/K003410/1] Funding Source: UKRI
The cross section for e(+)e(-) -> pi(+)pi(-) J/psi between 3.8 and 5.5 GeV is measured with a 967 fb(-1) data sample collected by the Belle detector at or near the Upsilon(nS) (n = 1, 2, . . . , 5) resonances. The Y(4260) state is observed, and its resonance parameters are determined. In addition, an excess of pi(+)pi(-) J/psi production around 4 GeV is observed. This feature can be described by a Breit-Wigner parametrization with properties that are consistent with the Y(4008) state that was previously reported by Belle. In a study of Y(4260) -> pi(+)pi(-) J/psi decays, a structure is observed in the M(pi(+/-) J/psi) mass spectrum with 5.2 sigma significance, with mass M = (3894.5 +/- 6.6 +/- 4.5) MeV/c(2) and width Gamma = (63 +/- 24 +/- 26) MeV/c(2), where the errors are statistical and systematic, respectively. This structure can be interpreted as a new charged charmoniumlike state.
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