期刊
PHYSICAL REVIEW LETTERS
卷 129, 期 4, 页码 -出版社
AMER PHYSICAL SOC
DOI: 10.1103/PhysRevLett.129.042001
关键词
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资金
- National Key Research and Development Program of China [2020YFA0406300, 2020YFA0406400]
- National Natural Science Foundation of China (NSFC) [11625523, 11635010, 11735014, 11822506, 11835012, 11935015, 11935016, 11935018, 11961141012, 12022510, 12025502, 12035009, 12035013, 12061131003]
- Chinese Academy of Sciences (CAS) Large-Scale Scientific Facility Program
- NSFC [U1732263, U1832207]
- CAS [U1732263, U1832207]
- CAS Key Research Program of Frontier Sciences [QYZDJ-SSW-SLH040]
- 100 Talents Program of CAS
- Shanghai Key Laboratory for Particle Physics and Cosmology
- ERC [758462]
- European Union [894790]
- German Research Foundation DFG [443159800, CRC 1044, GRK 214]
- Istituto Nazionale di Fisica Nucleare, Italy
- Ministry of Development of Turkey [DPT2006K-120470]
- National Science and Technology fund
- Olle Engkvist Foundation [200-0605]
- STFC (United Kingdom)
- Knut and Alice Wallenberg Foundation (Sweden) [2016.0157]
- Royal Society, UK [DH140054, DH160214]
- Swedish Research Council
- U.S. Department of Energy [DE-FG02-05ER41374, DE-SC-0012069]
- INPAC
Based on the data collected by the BESIII detector, a new resonance state X(2600) is observed in the process J/psi -> gamma pi(+)pi(-) eta'. The mass of X(2600) is determined to be 2618.3 MeV/c(2) with a width of 195 MeV.
Based on (10087 +/- 44) x 10(6) J/psi events collected with the BESIII detector, the process J/psi -> gamma pi(+)pi(-) eta'is studied using two largest decay channels of the eta' meson,eta' -> gamma pi(+)pi(-)and eta' -> eta pi(+)pi(-), eta ->gamma gamma.A new resonance, which we denote as the X(2600), is observed with a statistical significance larger than 20 sigma in the pi(|) pi(-) eta' invariant mass spectrum, and it has a connection to a structure around 1.5 GeV/c(2) in the pi(|) pi(-) invariant mass spectrum. A simultaneous fit on the pi(|) pi(-) eta' invariant mass spectra with the two eta' decay modes indicates that the mass and width of the X(2600) state are 2618.3 +/- 2.0(-1.4)+(16.3) MeV/c(2) and 195 +/- 5(-17)(+26) MeV, where the first uncertainties are statistical, and the second systematic.
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