Speaker
Description
The $D^{+} \to K_s^0 \pi^{+} \eta$ reaction was recently measured by the BESIII collaboration [1]. The reaction is actually $D^{+} \to \bar{K}^0 \pi^{+} \eta$, with the $\bar{K}^0$ observed as a $K_s^0$ state.
We study the $D^{+} \to \bar{K}^0 \pi^{+} \eta$ reaction, where the $a_0(980)$ excitation plays a dominant role. We consider mechanisms of external and internal emission at the quark level, hadronize the $q \bar{q}$ components into two mesons, and allow these mesons to undergo final-state interaction, where the $a_0(980)$ state is dynamically generated. While the production of $a_0(980)$ 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 $a_0(980)$ 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 $D^0 \to K^{-} \pi^{+} \eta$ reaction by changing a $\bar{d} \to \bar{u}$ 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).
| session | D. Hadron Decays |
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