Measurements of branching fractions of $\Lambda_{c}^{+}\to\Sigma^{0}K_{S}^{0}\pi^{+}$ and $\Lambda_{c}^{+}\to\Sigma^{0}K_{S}^{0}K^{+}$

TL;DR

This paper reports the first observation and evidence of two specific decay modes of the Lambda_c+ baryon, measuring their branching fractions using data from the BESIII detector at various energies.

Contribution

It provides the first measurements of the branching fractions for the decays Lambda_c+ to Sigma^0 K_S^0 pi+ and Sigma^0 K_S^0 K+, including their statistical significances.

Findings

First observation of Lambda_c+ to Sigma^0 K_S^0 pi+ with 5.9σ significance.

First evidence of Lambda_c+ to Sigma^0 K_S^0 K+ with 3.7σ significance.

Branching fraction for Lambda_c+ to Sigma^0 K_S^0 pi+ is (0.58 ± 0.14 ± 0.04) x 10^{-3}.

Abstract

Based on a data sample corresponding to an integrated luminosity of 6.4~fb$^{-1}$ of $e^+e^-$ annihilation and collected with the BESIII detector at 13 center-of-mass energy points ranging between 4.600~GeV and 4.950~GeV, we report the first observation of the singly Cabibbo-suppressed decay $\Lambda_c^+ \to \Sigma^0 K_S^0 \pi^+$ with a statistical significance of 5.9$\sigma$. The branching fraction is determined to be $\mathcal{B}(\Lambda_c^+ \to \Sigma^0 K_S^0 \pi^+) = (0.58 \pm 0.14_{\rm stat.} \pm 0.04_{\rm syst.}) \times 10^{-3}$. In addition, the decay $\Lambda_c^+\to\Sigma^0K_{S}^{0} K^+$ has also been investigated, and the first evidence for this decay is obtained with a statistical significance of 3.7$\sigma$.