期刊
PHYSICAL REVIEW LETTERS
卷 101, 期 10, 页码 -出版社
AMER PHYSICAL SOC
DOI: 10.1103/PhysRevLett.101.101801
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资金
- A. P. Sloan Foundation
- National Science Foundation
- U. S. Department of Energy
- Natural Sciences and Engineering Research Council of Canada
- U. K. Science and Technology Facilities Council
- STFC [PP/F000650/1, ST/G502412/1, PP/E002722/1] Funding Source: UKRI
- Science and Technology Facilities Council [PPA/A/S/2003/00461/2, PP/E002722/1, PP/F000650/1, ST/G502412/1] Funding Source: researchfish
We report the first observation of the decay J/psi -> 3 gamma. The signal has a statistical significance of 6 sigma and corresponds to a branching fraction of B(J/psi -> 3 gamma)=(1.2 +/- 0.3 +/- 0.2)x10(-5), in which the errors are statistical and systematic, respectively. The measurement uses psi(2S)->pi(+)pi(-)J/psi events acquired with the CLEO-c detector operating at the CESR e(+)e(-) collider.
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