The measured π+η mass spectrum of Λc+ → n π+ η is best reproduced by chiral-unitary models that include the N(1440) nucleon excitation; the a2(1320) tensor meson does not improve the fit.
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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 generated. While the $a_0(980)$ 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 $a_0(980)$ significantly different from the one observed in other experiments, with an apparently much larger width.
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Revisiting the $\Lambda_c^+ \to n\pi^+\eta$ decay in light of the BESIII measurement
The measured π+η mass spectrum of Λc+ → n π+ η is best reproduced by chiral-unitary models that include the N(1440) nucleon excitation; the a2(1320) tensor meson does not improve the fit.