Natsumi Ikeno
(Tottori University)
The reaction was recently measured by the BESIII collaboration [1]. The reaction is actually , with the observed as a state.
We study the reaction, where the excitation plays a dominant role. We consider mechanisms of external and internal emission at the quark level, hadronize the components into two mesons, and allow these mesons to undergo final-state interaction, where the state is dynamically generated. While the production of is the dominant term, we also find other terms in the reaction that interfere with this production mode. Through interference with it, they lead to a shape of the significantly different from the one observed in other experiments, with an apparently much larger width. I will give a presentation based on Ref. [2] and also discuss the reaction by changing a quark in Ref. [3].
[1] M.~Ablikim et al. [BESIII], arXiv:2309.05760 [hep-ex].
[2] N. Ikeno, J. M. Dias, W. H. Liang and E. Oset, arXiv:2402.04073 [hep-ph].
[3] G. Toledo, N. Ikeno and E. Oset, Eur. Phys. J. C81, 268 (2021).