Two-pion transitions from the $P$-wave to $S$-wave charmonium states [PDF]
Zhi-Gang WangIn this article, we study the two-pion decays in the $P$-wave to $S$-wave charmonium transitions with the heavy meson effective theory, and make qualitative predictions for the ratios among the two-pion decay widths.View original: http://arxiv.org/abs/1210.4294
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