Study of Ξc+→ΛK¯0π+ and search for the low-lying baryons Ξ(1/2−) and Σ(1/2−)

Abstract

Since searches for the low-lying excited baryons Ξ(1/2−) and Σ(1/2−) are crucial to deepening our understanding of the light baryon spectrum, we have investigated the Cabibbo-favored process Ξc+→ΛK¯0π+ by taking into account the S-wave pseudoscalar meson-octet baryon interactions within the chiral unitary approach, which could dynamically generate the resonances Ξ(1/2−) and Σ(1/2−). The contributions from the excited kaons are double Cabibbo suppressed, and the contribution from the Σ(1385) is also suppressed due to Korner-Pati-Woo theory; thus, those states are expected to play negligible contributions in this process. We have predicted the K¯0Λ and π+Λ invariant mass distributions, which have the clear signals of the Ξ(1/2−) and Σ(1/2−). Thus, the Ξc+→ΛK¯0π+ is an ideal process to search for the low-lying baryons Ξ(1/2−) and Σ(1/2−), and we make a call for a precise measurements of this process in experiments, such as Belle II, LHCb, and the proposed Super Tau-Charm Facility. Published by the American Physical Society 2025