Mini-review of rare charmonium decays at BESIII

TL;DR

This review discusses rare charmonium decays at BESIII, emphasizing their potential to reveal new physics beyond the Standard Model through weak, CP-violating, and lepton flavor violating processes.

Contribution

It provides a comprehensive overview of rare charmonium decays and their significance in searching for new physics using BESIII data.

Findings

Potential to observe rare decays with large BESIII datasets

Rare decays could indicate physics beyond the Standard Model

Review of experimental prospects for detecting CP violation and lepton flavor violation

Abstract

Recently, LHCb experiment announced a 3.5$\sigma$ evidence for direct CP violation in $D^0$ decay by looking at the difference between $A_{CP}(D^0\rightarrow K^+K^-)$ and $A_{CP}(D^0\rightarrow \pi^+\pi^-)$. This is the first evidence of CP violation in charm system, which may indicate new physics beyond the Standard Model. Motivated by this measurement, we review rare processes in charmonium decay, especially, the weak decay, $C$ or $P$ violated decay and lepton flavor violated decays. In case the new physics appears in charm sector, these rare decays of charmonium states will provide opportunity to search for significant contributions from physics beyond the Standard Model. With huge $J/\psi$ and $\psi(2S)$ samples in BESIII experiment, the rare decays may be feasible.