Search for psi(2S)--> eta_c pi^+ pi^- pi^0

Details Search for psi(2S)--> eta_c pi^+ pi^- pi^0 Search for psi(2S)--> eta_c pi^+ pi^- pi^0

2006-11-14

arxiv.org/abs/hep-ex/0611027v2

Phys. Rev. D 75, 011102 (2007)

Physics

High Energy Physics

High Energy Physics - Experiment

8 pages postscript,also available through http://www.lns.cornell.edu/public/CLNS/2006/

Scientific paper

Using 5.63 pb^-1 of data accumulated at the psi(2S) resonance with the CLEO III and CLEO-c detectors corresponding to 3.08 million psi(2S) decays, a search is performed for the decay psi(2S) -> eta_c pi^+pi^-pi^0 to test a theoretical prediction based upon the assumption that the c \bar c pair in the psi(2S) does not annihilate directly into three gluons but rather survives before annihilating. No signal is observed, and a combined upper limit from six eta_c decay modes is determined to be B(psi(2S) -> eta_c pi^+pi^-pi^0) < 1.0 x 10^-3 at 90% C.L. This upper limit is about an order of magnitude below the theoretical expectation.

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