Measurement of the absolute branching fraction of $\Lambda_c^+\to p K^0_{\mathrm{S}}\eta$ decays

TL;DR

This paper reports the first measurement of the absolute branching fraction of the decay $ambda_c^+ o p K^0_S eta$ using data from the BESIII detector, providing new experimental insight into charmed baryon decays.

Contribution

The study provides the first absolute measurement of the $ambda_c^+ o p K^0_S eta$ decay branching fraction, aligning with previous relative measurements and theoretical models.

Findings

Measured branching fraction: (0.414 ± 0.084 ± 0.028)%

Result compatible with previous CLEO measurements

Consistent with SU(3) flavor symmetry predictions

Abstract

Based on 586 $\rm{pb^{-1}}$ of $e^+e^-$ annihilation data collected at a center-of-mass energy of $\sqrt{s}=4.6~\rm{GeV}$ with the BESIII detector at the BEPCII collider, the absolute branching fraction of $\Lambda_c^+ \to p K^0_{\mathrm{S}}\eta$ decays is measured for the first time to be $\mathcal{B}(\Lambda_c^+ \to p K^0_{\mathrm{S}}\eta) = (0.414 \pm 0.084 \pm 0.028)\%$, where the first uncertainty is statistical and the second is systematic. The result is compatible with a previous CLEO result on the relative branching fraction $\frac{\mathcal{B}(\Lambda_c^+ \to p K^0_{\mathrm{S}}\eta)}{\mathcal{B}(\Lambda_c^+ \to p K^-\pi^+)}$, and consistent with theoretical predictions of SU(3) flavor symmetry.