Charmonium decays to gamma pi0, gamma eta, and gamma eta'

Details Charmonium decays to gamma pi0, gamma eta, and gamma eta' Charmonium decays to gamma pi0, gamma eta, and gamma eta'

2009-04-08

arxiv.org/abs/0904.1394v2

Phys.Rev.D79:111101,2009

Physics

High Energy Physics

High Energy Physics - Experiment

14 pages, available through http://www.lns.cornell.edu/public/CLNS/, published in Physical Review D

Scientific paper

10.1103/PhysRevD.79.111101

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 pi0, gamma eta, and gamma eta'. Defining R_n = 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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