期刊
PHYSICAL REVIEW D
卷 104, 期 9, 页码 -出版社
AMER PHYSICAL SOC
DOI: 10.1103/PhysRevD.104.092012
关键词
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资金
- National Key Basic Research Program of China [2020YFA0406300, 2020YFA0406400]
- National Natural Science Foundation of China (NSFC) [11605042, 11625523, 11635010, 11735014, 11822506, 11835012, 11875122, 11935015, 11935016, 11935018, 11905236, 11961141012, 12022510, 12025502, 12035009, 12035013, 12047501, 12075107, 12061131003]
- Chinese Academy of Sciences (CAS)
- NSFC [U1732263, U1832207]
- CAS [U1732263, U1832207]
- CAS Key Research Program of Frontier Sciences [QYZDJ-SSW-SLH040]
- 100 Talents Program of CAS
- INPAC
- 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 [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]
- Excellent Youth Foundation of Henan Province [212300410010]
- youth talent support program of Henan Province [ZYQR201912178]
- Program for Innovative Research Team in University of Henan Province [19IRTSTHN018]
- Fundamental Research Funds for the Central Universities [lzujbky-2021-sp24]
By using the BESIII detector and a single-baryon tagging technique, researchers have observed for the first time the decays of psi(3686) boson, measured the branching fractions, and determined the angular distribution parameter alpha associated with the decay process. The results are consistent with theoretical predictions within one standard deviation.
Using (448.1 +/- 2.9) x 10(6) psi (3686) events collected with the BESIII detector and a single-baryon tagging technique, we present the first observation of the decays psi(3686)-> Xi (1530)(0) (Xi) over bar (1530)(0) and Xi (1530)(0) (Xi) over bar (0). The branching fractions are measured to be B psi (3686)-> Xi (1530)(0) (Xi) over bar (1530)(0)) = (6.77 +/- 0.14 +/- 0.39 x 10(- 5) and B (psi(3686)-> Xi (1530)(0) (Xi) over bar (0) = (0.53 +/- 0.04 +/- 0.03) x 10(-5). Here, the first and second uncertainties are statistical and systematic, respectively. In addition, the parameter associated with the angular distribution for the decay psi (3686) ->Xi (1530)(0) (Xi) over bar (1530)(0) is determined to be alpha= 1/4 0.32 +/- 0.19 +/- 0.07, in agreement with theoretical predictions within one standard deviation.
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