Evidence for X(3872)-->gamma J/psi and the sub-threshold decay X(3872)-->omega J/psi

Details Evidence for X(3872)-->gamma J/psi and the sub-threshold decay X(3872)-->omega J/psi Evidence for X(3872)-->gamma J/psi and the sub-threshold decay X(3872)-->omega J/psi

2005-05-14

arxiv.org/abs/hep-ex/0505037v1

Physics

High Energy Physics

High Energy Physics - Experiment

10 pages, 4 figures, paper submitted to Lepton-Photon 2005, Uppsala Sweden, June 30-July 5, 2005

Scientific paper

We report evidence for the decay modes X(3872) --> gamma J/psi and X(3872)--> pi+pi-pi0 J/psip. In the latter, the pi+pi-pi0 invariant mass distribution has a strong peak between 750 MeV and the kinematic limit of 775 MeV, suggesting that the process is dominated by the sub-threshold decay X --> omega J/psi. These results establish the charge-conjugation parity of the X(3872) as C=+1. The results are based on a study of X(3872) mesons produced via exclusive B --> K X(3872) decays in a 256 fb-1 data sample collected at the Upsilon(4S) resonance in the Belle detector at the KEKB collider. The X(3872) --> gamma J/psi signal and the pi+pi-pi0 J/psi signal each has a statistical significance that is greater than 4 sigma.

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