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

et al; J. Z. Bai; M. Ablikim

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

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arxiv 0709.3371 v1 pith:NE3FGK4Q submitted 2007-09-21 hep-ex

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

M. Ablikim , J. Z. Bai , et al This is my paper

classification hep-ex

keywords gammapsi-timesc-parityprocessviolatingbes-iibranching

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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.

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

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