Search for the decay $D_{s}^{+} \to p\bar{p}e^{+}\nu_{e}$

TL;DR

This study searches for a rare decay of the $D_{s}^{+}$ meson into a proton, antiproton, electron, and neutrino, setting an upper limit on its branching fraction due to no significant signal being observed.

Contribution

First experimental search for the decay $D_{s}^{+} ightarrow p ar{p} e^{+} u_{e}$ and setting an upper limit on its branching fraction.

Findings

No significant signal observed.

Upper limit on branching fraction set at $2.0 imes 10^{-4}$.

Provides input for understanding baryonic transitions in $D_{s}^{+}$ mesons.

Abstract

Using a $3.19~\mathrm{fb}^{-1}$ data sample collected at the $\sqrt{s}~=~4.178$ GeV with the BESIII detector, we search for the rare decay $D_{s}^{+} \rightarrow p \bar{p} e^{+} \nu_{e} $. No significant signal is observed, and an upper limit of $\mathcal{B}(D_{s}^{+} \rightarrow p \bar{p} e^{+} \nu_{e}) < 2.0 \times 10^{-4}$ is set at the 90\% confidence level. This measurement is useful input in understanding the baryonic transition of $D_{s}^{+}$ mesons.