期刊
PHYSICAL REVIEW D
卷 104, 期 9, 页码 -出版社
AMER PHYSICAL SOC
DOI: 10.1103/PhysRevD.104.L091104
关键词
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资金
- National Key Research and Development Program of China [2020YFA0406400, 2020YFA0406300]
- National Natural Science Foundation of China (NSFC) [11625523, 11635010, 11735014, 11822506, 11835012, 11875115, 11905236, 11935015, 11935016, 11935018, 11961141012, 12022510, 12035009, 12035013, 12047501, 12075107, 12061131003]
- Chinese Academy of Sciences (CAS) Large-Scale Scientific Facility Program
- NSFC [U1732263, U1832207]
- CAS Key Research Program of Frontier Sciences [QYZDJSSW-SLH040]
- Fundamental Research Funds for the Central Universities [lzujbky-2021-sp24]
- 100 Talents Program of CAS
- Institute of Nuclear and Particle Physics, Astronomy and Cosmology and Shanghai Key Laboratory for Particle Physics and Cosmology
- ERC [758462]
- European Union [894790]
- German Research Foundation DFG [443159800, CRC 1044, FOR 2359, GRK 214]
- Istituto Nazionale di Fisica Nucleare, Italy
- Ministry of Development of Turkey [DPT2006K120470]
- National Science and Technology fund
- Olle Engkvist Foundation [200-0605]
- STFC (United Kingdom)
- Knut and Alice Wallenberg Foundation (Sweden) [2016.0157]
- Royal Society, U.K [DH140054, DH160214]
- Swedish Research Council
- U.S. Department of Energy [DE-FG0205ER41374, DE-SC-0012069]
- CAS [U1732263, U1832207]
In this study, the Born cross section of the process e(+)e(-) ->Lambda(Lambda) over bar over line was measured with the BESIII detector at the BEPCII collider using data corresponding to a total integrated luminosity of 20.0 fb(-1) at 33 center-of-mass energies between 3.51 and 4.60 GeV. The contribution from the psi(3770) -> Lambda(Lambda) over bar decay was found to be significant in describing the energy dependence of the cross section. This result highlights the importance of considering effects from vector charmonium(like) states when interpreting data and sets upper limits for their electronic widths and branching fractions.
The Born cross section of the process e(+)e(-) ->Lambda(Lambda) over bar over line is measured at 33 center-of-mass energies between 3.51 and 4.60 GeV using data corresponding to the total integrated luminosity of 20.0 fb(-1) collected with the BESIII detector at the BEPCII collider. Describing the energy dependence of the cross section requires a contribution from the psi(3770) -> Lambda(Lambda) over bar decay, which is fitted with a significance of 4.6 - 4.9 sigma including the systematic uncertainty. The lower bound on its branching fraction is 2.4 x 10(-6) at the 90% confidence level (C.L.), at least an order of magnitude larger than expected from predictions using a scaling based on observed electronic widths. This result indicates the importance of effects from vector charmonium(like) states when interpreting data in terms of e.g., electromagnetic structure observables. The data do not allow for definite conclusions on the interplay with other vector charmonium(like) states, and we set 90% C.L. upper limits for the products of their electronic widths and the branching fractions.
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