We study the D+→Kˉ0π+η reaction where the a0(980) excitation plays a dominant role. We consider mechanisms of external and internal emission at the quark level, hadronize the qqˉ components into two mesons and allow these mesons to undergo final state interaction where the a0(980) state is generated. While the a0(980) production is the dominant term, we also find other terms in the reaction that interfere with this production mode and, through interference with it, lead to a shape of the a0(980) significantly different from the one observed in other experiments, with an apparently much larger width.
@article{arxiv.2402.04073,
title = {$D^+ \to K_s^0 \pi^+ \eta$ reaction and $a_0(980)^+$},
author = {Natsumi Ikeno and Jorgivan M. Dias and Wei-Hong Liang and Eulogio Oset},
journal= {arXiv preprint arXiv:2402.04073},
year = {2024}
}