期刊
PHYSICAL REVIEW LETTERS
卷 118, 期 9, 页码 -出版社
AMER PHYSICAL SOC
DOI: 10.1103/PhysRevLett.118.092002
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, 11275266]
- CAS [U1232201, U1332201, U1532257, U1532258, KJCX2-YW-N29, KJCX2-YW-N45]
- 100 Talents Program of CAS
- National 1000 Talents Program of China
- INPAC
- Shanghai Key Laboratory for Particle Physics and Cosmology
- German Research Foundation DFG [Collaborative Research Center CRC 1044, FOR 2359]
- Istituto Nazionale di Fisica Nucleare, Italy
- Koninklijke Nederlandse Akademie van Wetenschappen (KNAW) [530-4CDP03]
- Ministry of Development of Turkey [DPT2006K-120470]
- Swedish Resarch Council
- U.S. Department of Energy [DE-FG02-05ER41374, DE-SC-0010504, DE-SC0012069, DESC0010118]
- U.S. National Science Foundation
- University of Groningen (RuG), Darmstadt
- Helmholtzzentrum fuer Schwerionenforschung GmbH (GSI), Darmstadt
- WCU Program of National Research Foundation of Korea [R32-2008-000-10155-0]
The cross sections of e(+)e(-) -> pi(+) pi(-) hc at center-of-mass energies from 3.896 to 4.600 GeVare measured using data samples collected with the BESIII detector operating at the Beijing Electron Positron Collider. The cross sections are found to be of the same order of magnitude as those of e(+)e(-) -> pi(+) pi(-) J/psi and e(+)e(-) -> pi(+) pi(-) psi (2S), but the line shape is inconsistent with the Y states observed in the latter two modes. Two structures are observed in the e(+)e(-) -> pi(+) pi(-) hc cross sections around 4.22 and 4.39 GeV/c(2), which we call Y(4220)and Y(4390), respectively. A fit with a coherent sum of two Breit-Wigner functions results in a mass of (4218.4(- 4.5)(vertical bar 5.5) +/- 0.9) MeV/ c(2) and a width of (66.0(- 8.3)(vertical bar 12.3) +/- 0.4) MeV for the Y(4220), and a mass of (4391.5(- 6.8)(+6.3) +/- 1.0) MeV/c(2) and a width of (139.5(- 20.6)(+16.2) +/- 0.6) MeV for the Y(4390), where the first uncertainties are statistical and the second ones systematic. The statistical significance of Y(4220) and Y(4390) is 10 sigma over one structure assumption.
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