期刊
PHYSICAL REVIEW D
卷 104, 期 11, 页码 -出版社
AMER PHYSICAL SOC
DOI: 10.1103/PhysRevD.104.112012
关键词
-
资金
- National Key Research and Development Program of China [2020YFA0406400, 2020YFA0406300]
- National Natural Science Foundation of China (NSFC) [11875115, 11625523, 11635010]
- Research Funds for the Central Universities, Sun Yat-sen University
- Chinese Academy of Sciences (CAS) Large-Scale Scientific Facility Program
- Joint Large-Scale Scientific Facility Funds of the NSFC and CAS [U1732263, U1832207, U2032110]
- CAS Key Research Program of Frontier Sciences [QYZDJ-SSW-SLH003, 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]
- Collaborative Research Center [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)
- The Knut and Alice Wallenberg Foundation (Sweden) [2016.0157]
- The Royal Society, UK [DH140054, DH160214]
- The Swedish Research Council
- U.S. Department of Energy [DE-FG02-05ER41374, DE-SC-001206]
Based on collision data at 4.178 GeV center-of-mass energy, the electromagnetic Dalitz decay D*(0) -> D(0)e(+)e(-) is observed with 13.2 sigma significance for the first time. The ratio of its branching fraction to D*(0) -> D-0 gamma is measured, and the branching fraction of D*(0) -> D(0)e(+)e(-) is determined with external input of branching fraction for D*(0) -> D-0 gamma.
Based on 3.19 fb(-1) of e(+) e(-) collision data accumulated at the center-of-mass energy 4.178 GeV with the BESIII detector operating at the BEPCII collider, the electromagnetic Dalitz decay D*(0) -> D(0)e(+)e(-) is observed for the first time with a statistical significance of 13.2 sigma. The ratio of the branching fraction of D*(0) -> D(0)e(+)e(-) to that of D*(0) -> D-0 gamma is measured to be (11.08 +/- 0.76 +/- 0.49) x 10(-3). By using the world average value of the branching fraction of D*(0) -> D-0 gamma, the branching fraction of D*(0) -> D(0)e(+)e(-) is determined to be (3.91 +/- 0.27 +/- 0.17 +/- 0.10) x 10(-3), where the first uncertainty is statistical, the second is systematic and the third is from external input of the branching fraction for D*(0) -> D-0 gamma.
作者
我是这篇论文的作者
点击您的名字以认领此论文并将其添加到您的个人资料中。
推荐
暂无数据