Charmonium decays to γπ0, γη, and γη′

Journal article

Using data acquired with the CLEO-c detector at the CESR e+e- collider, we measure branching fractions for J/ψ, ψ(2S), and ψ(3770) decays to γπ0, γη, and γη′. Defining Rn B[ψ(nS)→γη]/B[ψ(nS)→γη′], we obtain R1=(21.1±0.9)% and, unexpectedly, an order of magnitude smaller limit, R2<1.8% at 90% C.L. We also use J/ψ→γη′ events to determine branching fractions of improved precision for the five most copious η′ decay modes. © 2009 The American Physical Society.

Authors: Pedlar, T; Xavier, J; Cronin-Hennessy, D; Gao, K; Hietala, J

• Journal: Physical Review D
• Volume: 79
• Issue: 11
• Publication date: 2009-06-05
• DOI: 10.1103/PhysRevD.79.111101
• EISSN: 1550-2368
• ISSN: 1550-7998
• Language: English