Search for Baryon/Lepton number violation processes at BESIII

TL;DR

This paper reports on BESIII experiment searches for baryon and lepton number violation processes in various particle decays to understand matter-antimatter asymmetry.

Contribution

It presents new experimental searches for BNV and LNV processes in specific decay modes, expanding the scope of previous investigations.

Findings

No evidence of BNV or LNV observed in the studied decays.

Sets new upper limits on the rates of these rare processes.

Provides constraints on theories predicting baryon and lepton number violation.

Abstract

The observed matter-antimatter asymmetry in the universe is a serious challenge to our understanding of nature. Baryon/lepton number violation (BNV/LNV) decays have been searched for in many experiments to understand this large-scale observed fact. We present the recent results from the BESIII experiment, including a search for BNV through $\Lambda-\bar{\Lambda}$ oscillation in the decays $J/\psi\to pK^-\bar{\Lambda}$ and $J/\psi\to\Lambda\bar{\Lambda}$. We also present searches for LNV in $D_s^+\to h^+h^0e^+e^-$ and $\omega/\phi\to\pi^+\pi^-e^+e^-$ decays, alongside probes into processes violating both baryon and lepton numbers simultaneously, such as $\Xi^0\to K^+e^-/K^-e^+$.