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 $\Lambda_c^{ +}\to\Sigma^0K^{ +}\pi^{ +}\pi^{ -}$.
Categories: hep-ex