Search for the C-parity violating process J/psi->gamma gamma via psi(2S)->pi+pi- J/psi

Details Search for the C-parity violating process J/psi->gamma gamma via psi(2S)->pi+pi- J/psi Search for the C-parity violating process J/psi->gamma gamma via psi(2S)->pi+pi- J/psi

2007-09-21

arxiv.org/abs/0709.3371v1

Phys.Rev.D76:117101,2007

Physics

High Energy Physics

High Energy Physics - Experiment

4 pages 2 figures

Scientific paper

10.1103/PhysRevD.76.117101

Using 14.0\times 10^6 \psi(2S) events collected with the BES-II detector, the
C-parity violating process J/psi->gamma gamma via psi(2S)->pi+pi- J/psi is
studied. We determine a new upper limit for the J/psi->gamma gamma branching
ratio of B(J/psi->gamma gamma)<2.2\times 10^{-5} at the 90% C.L., which is
about 20 times lower than the previous measurement.

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