Prospects for rare and forbidden hyperon decays at BESIII

TL;DR

This paper discusses the potential of BESIII to study hyperon decays, including rare and forbidden processes, using large data samples from $J/$ decays to improve understanding of hyperon properties and search for new physics.

Contribution

It proposes a detailed experimental approach at BESIII to measure hyperon decay branching fractions and explore rare and invisible decay modes with unprecedented sensitivity.

Findings

Projected sensitivity of $10^{-5}$ to $10^{-8}$ for hyperon decay branching fractions

Potential to probe rare and forbidden hyperon decays with large data samples

Use of tag technique to identify decays with invisible final states

Abstract

The study of hyperon decays at the Beijing Electron Spectrometer III (BESIII) is proposed to investigate the events of $J/\psi$ decay into hyperon pairs, which provide a pristine experimental environment at the Beijing Electron--Positron Collider II. About $10^{6}$--$10^8$ hyperons, i.e., $\Lambda$, $\Sigma$, $\Xi$, and $\Omega$, will be produced in the $J/\psi$ and $\psi(2S)$ decays with the proposed data samples at BESIII. Based on these samples, the measurement sensitivity of the branching fractions of the hyperon decays is in the range of $10^{-5}$--$10^{-8}$. In addition, with the known center-of-mass energy and "tag technique," rare decays and decays with invisible final states can be probed.