Search for the Low-Lying Excited Baryon Σ * (1/2 − ) through Process Λ c + → Λ K 0 π +

Abstract Motivated by recent BESIII measurements of the singly Cabibbo-suppressed processes Λ c + → Λ K + π 0 and Λ c + → Λ K S 0 π + , we investigate the process Λ c + → Λ K 0 π + by taking into account the contribution from the low-lying excited baryon Σ * (1/2 − ), dynamically generated via the S-wave pseudoscalar meson-octet baryon interaction, as well as from the intermediate resonances K * (892) and N (1535). Our model successfully reproduces the BESIII π + K 0 invariant mass distribution, and predicts a distinct cusp structure around 1.43 GeV in the π + Λ invariant mass distribution, which is associated with the predicted Σ * (1/2 − ). Future high-precise measurements of this process at BESIII, Belle II, and the proposed Super Tau-Charm Facility experiments will be crucial for testing the existence of Σ * (1/2 − ) and advancing our understanding of the light baryon spectrum.