Search for baryon and lepton number violating decays $D^{0}\to \bar{p}e^{+}$ and $D^{0}\to pe^{-}$

TL;DR

This study searches for rare baryon and lepton number violating decays of the D0 meson using BESIII data, setting upper limits on their branching fractions due to no observed signals.

Contribution

First search for these specific baryon and lepton number violating decays of D0 meson with BESIII data, establishing new upper limits.

Findings

No significant signals observed.

Upper limits on branching fractions set at 1.2×10⁻⁶ and 2.2×10⁻⁶.

Results constrain new physics models.

Abstract

Using an electron-positron collision data sample corresponding to an integrated luminosity of 2.93~fb$^{-1}$ collected with the BESIII detector at a center-of-mass energy of 3.773 GeV, we search for the baryon and lepton number violating decays $D^{0}\to \bar{p}e^{+}$ and $D^{0}\to pe^{-}$. No obvious signals are found with the current statistics. The upper limits on the branching fractions for $D^{0}\to \bar{p}e^{+}$ and $D^{0}\to pe^{-}$ are set to be $1.2\times 10^{-6}$ and $2.2\times 10^{-6}$ at 90\% confidence level, respectively.