Pursuit of $CP$ violation in hyperon decays at $e^+e^-$ colliders

TL;DR

This paper reviews the search for $CP$ violation in hyperon decays at $e^+e^-$ colliders, highlighting recent BESIII results, comparing them with standard model predictions, and discussing future prospects at super tau-charm factories.

Contribution

It provides a concise overview of experimental efforts, recent results, and future directions in hyperon $CP$ violation studies at $e^+e^-$ colliders.

Findings

Recent BESIII results on hyperon $CP$ asymmetries

Comparison of experimental data with standard model predictions

Discussion of potential new physics enhancements

Abstract

We present a concise overview on $CP$ violation in hyperon decays, including past, present, and future efforts to search for it. We highlight in particular the most recent results of the BESIII experiment using a quantum-entangled pair of hyperon and antihyperon produced by a charmonium resonance formed in $e^+e^-$ annihilation. The subsequent nonleptonic decays of these hyperon pairs allow for the simultaneous determination of various parameters pertaining to $CP$ violation in the decays. We compare the reported data with the corresponding current predictions for $CP$ asymmetries within the standard model of particle physics. Moreover, we touch on how much these asymmetries might be enhanced by possible new physics beyond the standard model. We also comment briefly on the importance of the proposed super tau-charm factories in future quests for hyperon $CP$-violation.