Searches for new physics beyond the Standard Model in hyperon sector

TL;DR

This paper reviews recent experimental efforts at BESIII to search for new physics beyond the Standard Model using hyperon decays, including studies of dark baryons, BSM particles, and electric dipole moments, setting new constraints.

Contribution

It presents pioneering measurements of hyperon properties and decay modes that significantly improve constraints on new physics scenarios beyond previous limits.

Findings

Determined the $\Lambda$ electric dipole moment with unprecedented sensitivity.

Set world-leading constraints on dark baryons and BSM particles.

Demonstrated hyperon decays as a powerful probe for fundamental physics.

Abstract

Hyperon physics offers a distinctive laboratory for probing the intensity frontier and searching for physics beyond the Standard Model. This review summarizes recent results from the BESIII experiment, including pioneering studies of dark baryons, massless BSM particles, and invisible decay modes, together with investigations of baryon- and lepton-number violation. A central highlight is the determination of the $\Lambda$ electric dipole moment using quantum-entangled hyperon-antihyperon pairs, achieving a sensitivity three orders of magnitude beyond previous limits. These measurements provide world-leading constraints on new physics scenarios and establish a robust foundation for next-generation precision studies. By integrating experimental progress with theoretical developments and future facility prospects, this review emphasizes the critical role of hyperon probes in testing the fundamental laws of nature.