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Abstract: The effects of intermediate charmed mesons on charmonium transitions with theemission of one pion or eta are studied systematically. Based on anon-relativistic effective field theory we show that charmed meson loops areenhanced compared to the corresponding tree-level contributions for transitionsbetween two S-wave charmonia as well as for transitions between two P-wavecharmonia. On the contrary, for the transitions between one S-wave and oneP-wave charmonium state, the loops need to be analyzed case by case and oftenappear to be suppressed. The relation to and possible implications for aneffective Lagrangian approach are also discussed. This study at the same timeprovides a cross check for the numerical evaluations.



Author: Feng-Kun Guo, Christoph Hanhart, Gang Li, Ulf-G. Mei├čner, Qiang Zhao

Source: https://arxiv.org/



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