Journal
PHYSICAL REVIEW D
Volume 79, Issue 11, Pages -Publisher
AMER PHYSICAL SOC
DOI: 10.1103/PhysRevD.79.111101
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Funding
- 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 [PP/F000650/1] Funding Source: researchfish
- STFC [PP/F000650/1] Funding Source: UKRI
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Using data acquired with the CLEO-c detector at the CESR e(+)e(-) collider, we measure branching fractions for J/psi, psi(2S), and psi(3770) decays to gamma pi(0), gamma eta, and gamma eta'. Defining R-n equivalent to B[psi(nS) -> gamma eta]/B[psi(nS) -> gamma eta'], we obtain R-1 = (21.1 +/- 0.9)% and, unexpectedly, an order of magnitude smaller limit, R-2 < 1.8% at 90% C.L. We also use J/psi -> gamma eta' events to determine branching fractions of improved precision for the five most copious eta' decay modes.
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