期刊
PHYSICAL REVIEW D
卷 82, 期 9, 页码 -出版社
AMER PHYSICAL SOC
DOI: 10.1103/PhysRevD.82.092002
关键词
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资金
- National Science Foundation
- U.S. Department of Energy
- Natural Sciences and Engineering Research Council of Canada
- U.K. Science and Technology Facilities Council
- Science and Technology Facilities Council [ST/H001026/1, PP/F000650/1, ST/H001026/2] Funding Source: researchfish
- STFC [PP/F000650/1, ST/H001026/2, ST/H001026/1] Funding Source: UKRI
The decays of psi(2S) into gamma p (p) over bar, pi(0)p (p) over bar, and eta p (p) over bar have been studied with the CLEO-c detector using a sample of 24.5 X 10(6) psi(2S) events obtained from e(+)e(-) annihilations at root s = 3686 MeV. The data show evidence for the excitation of several N* resonances in p pi(0) and p eta channels in pi(0)p (p) over bar and eta p (p) over bar decays, and f(2) states in gamma p (p) over bar decay. Branching fractions for decays of c psi(2S) to gamma p (p) over bar, pi(0)p (p) over bar, and eta p (p) over bar have been determined. No evidence for p (p) over bar threshold enhancements was found in the reactions psi(2S) -> Xp (p) over bar where X = gamma, pi(0), eta. We do, however, find confirming evidence for a p (p) over bar threshold enhancement in J/psi -> gamma p (p) over bar as previously reported by BES.
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