Search for the Cabibbo-suppressed decays $\Lambda_c^{+}\to\Sigma^0K^{+}\pi^{0}$ and $\Lambda_c^{+}\to\Sigma^0K^{+}\pi^{+}\pi^{-}$

TL;DR

This study searches for rare Cabibbo-suppressed decays of the $\\Lambda_c^{+}$ baryon using BESIII data but finds no significant signals, setting upper limits on their branching fractions.

Contribution

First search for these specific Cabibbo-suppressed decays of the $\\Lambda_c^{+}$ baryon using a large dataset, establishing upper limits on their branching fractions.

Findings

No significant signals observed for the decays.

Upper limits on branching fractions set at 5.0×10⁻⁴ and 6.5×10⁻⁴.

Provides constraints for theoretical models of charmed baryon decays.

Abstract

Utilizing 4.5 $fb^-$ 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 search for the singly Cabibbo-suppressed hadronic decays $\Lambda_{c}^{+}\to\Sigma^{0} K^{+}\pi^{0}$ and $\Lambda_{c}^{+}\to\Sigma^{0}K^{+}\pi^+\pi^-$ with a single-tag method. No significant signals are observed for both decays. The upper limits on the branching fractions at the $90\%$ confidence level are determined to be $5.0\times 10^{-4}$ for $\Lambda_{c}^{+}\to\Sigma^{0} K^{+}\pi^{0}$ and $6.5\times 10^{-4}$ for $\Lambda_c^{+}\to\Sigma^0K^{+}\pi^{+}\pi^{-}$.