paper

Puzzles in charmonium decays

arXiv:1012.2887 · doi:10.1016/j.nuclphysbps.2010.10.088

Abstract

The open charm effects via intermediate hadron loop transitions seem to play a crucial role in the understanding of several existing "puzzles" in charmonium exclusive decays, such as the $I ¨ (3770)$ non- $D D ˉ$ decays, and " $I ¨ I ¨ $ puzzle" etc. In the charmonium energy region, non-perturbative mechanisms could be still sizeable, and as a consequence the intermediate hadron loop transitions also provide a mechanism for the helicity-selection-rule (HSR) violation. We report our recent progress on those existing puzzles.

Invited talk on the 15th International Conference in QCD, June 28- July 3, 2010, Montpellier, France