Search for baryon and lepton number violating decays $D^+\to\bar\Lambda(\bar\Sigma^0)e^+$ and $D^+\to\Lambda(\Sigma^0)e^+$

TL;DR

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

Contribution

First search for specific baryon and lepton number violating decays of D+ mesons using BESIII data, establishing upper limits on their branching fractions.

Findings

No significant signals observed for the decays.

Upper limits on branching fractions are set at 10^{-6}.

Results constrain new physics models predicting such decays.

Abstract

Using a 2.93 fb$^{-1}$ data sample of electron-positron collisions taken with the BESIII detector at a center-of-mass energy of 3.773 GeV, which corresponds to $(8296\pm31\pm64)\times10^3 D^+D^-$ pairs, we search for the baryon and lepton number violating decays $D^+\to\bar\Lambda(\bar\Sigma^0)e^+$ and $D^+\to\Lambda(\Sigma^0)e^+$. No obvious signals are found with the current statistics and upper limits on the branching fractions of these four decays are set at the level of $10^{-6}$ at 90% confidence level.