Cabibbo-favored [formula omitted] decay in the final state interaction

Abstract

The anti-triplet charmed baryon decays with the light scalar mesons are rarely measured, whereas the recent observation of the Cabibbo-favored Λc+→Ληπ+ decay hints a possible Λc+→Λa0(980)+,a0(980)+→ηπ+ process. We hence study the Λc+→Λa0(980)+ decay. Particularly, it is found that the final state interaction can give a significant contribution, where Σ+(1385) and η in Λc+→Σ+(1385)η by exchanging a charged pion are transformed as Λ and a0(980)+, respectively. Accordingly, we predict B(Λc+→Λa0(980)+)=(1.7−1.0+2.8±0.3)×10−3, accessible to the BESIII, BELLEII and LHCb experiments.