Search for Cabibbo-suppressed decays Λ⁺_c → Σ⁰K⁺π⁰ and Λ⁺_c → Σ⁰K⁺π⁺π⁻

Utilizing 4.5 fb⁻¹ of e⁺e⁻ annihilation data collected at center-of-mass energies ranging from 4599.53 MeV to 4698.82 MeV by the BESIII detector at the BEPCII collider, we searched for singly Cabibbo-suppressed hadronic decays Λ⁺_c → Σ⁰K⁺π⁰ and Λ⁺_c → Σ⁰K⁺π⁺π⁻ with a single-tag method. No significant signals were observed for both decays. The upper limits on the branching fractions at the 90% confidence level were determined to be 5.0×10⁻⁴ for Λ⁺_c → Σ⁰K⁺π⁰ and 6.5×10⁻⁴ for Λ⁺_c → Σ⁰K⁺π⁺π⁻.