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Evidence for η_c→γγ and Measurement of
J/ψ→ 3γ
release_cbxylulfkzd75gpdkaftqtbisu
by
BESIII Collaboration: M. Ablikim, M. N. Achasov, D. J. Ambrose, F. F.
An, Q. An, Z. H. An, J. Z. Bai, Y. Ban, J. Becker, M. Bertani, J. M. Bian, E.
Boger (+316 others)
Released
as a article
.
2012
Abstract
The decay of J/ψ to three photons is studied using
ψ(3686)→π^+π^-J/ψ in a sample of 1.0641×10^8 ψ(3686)
events collected with the BESIII detector. Evidence of the direct decay of
η_c to two photons, η_c→γγ, is reported, and the product
branching fraction is determined to be
B(J/ψ→γη_c,η_c→γγ)=(4.5±1.2±0.6)×10^-6, where the first error is
statistical and the second is systematic. The branching fraction for
J/ψ→3γ is measured to be (11.3±1.8±2.0)× 10^-6 with
improved precision.
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1208.1461v2
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