Measurement of the branching fractions of the singly Cabibbo-suppressed decays $\Lambda_{c}^{+}\to p\eta$ and $\Lambda_{c}^{+}\to p\omega$

TL;DR

This paper reports precise measurements of the branching fractions for the decays $ambda_{c}^{+} o peta$ and $ambda_{c}^{+} o pomega$ using BESIII data, confirming previous results and improving precision.

Contribution

First precise measurement of these decay modes' branching fractions, using a single-tag method on BESIII data, with results consistent with prior experiments.

Findings

Branching fraction for $ambda_{c}^{+} o peta$ is (1.57±0.11±0.04)×10⁻³.

Branching fraction for $ambda_{c}^{+} o pomega$ is (1.11±0.20±0.07)×10⁻³.

Results are the most precise to date and consistent with previous measurements.

Abstract

Based on 4.5 $\mbox{fb$^{-1}$}$ $e^{+}e^{-}$ collision data collected with BESIII detector at seven energy points between 4.600 and 4.699 GeV, the branching fractions for $\Lambda_{c}^{+}\to p\eta$ and $\Lambda_{c}^{+}\to p\omega$ were measured by means of single-tag method. The branching fractions of $\Lambda_{c}^{+}\to p\eta$ and $\Lambda_{c}^{+}\to p\omega$ are determined to be $(1.57\pm0.11_{\rm {stat}}\pm0.04_{\rm{syst}})\times10^{-3}$ and $(1.11\pm0.20_{\rm{stat}}\pm0.07_{\rm{syst}})\times10^{-3}$, with a statistical significance of greater than 10 $\sigma$ and 5.7 $\sigma$, respectively. These results are consistent with the previous measurements by BESIII, LHCb and Belle, and the result of $\Lambda_{c}^{+}\to p\eta$ is the most precise to date.