Search for dark sector at BESIII

TL;DR

This paper reports on various searches for dark sector particles using BESIII data, including dark photons, invisible decays, dark baryons, and axion-like particles, to explore physics beyond the Standard Model.

Contribution

It presents the first comprehensive set of experimental results from BESIII targeting multiple dark sector candidates in charm and light meson decays.

Findings

No significant signals observed in the searched channels.

Upper limits set on dark photon and axion-like particle production.

Constraints improve the parameter space for dark sector models.

Abstract

BESIII experiment has collected a large data sample of charmonium, charm mesons, hyperons, and other light mesons. These data provide a unique opportunity to explore the dark sector beyond the Standard Model, particularly for dark sectors that couple to charm quarks or other light quarks, and for dark sectors with masses in the $\tau-c$ energy region. We present recent dark sector search results from the BESIII experiment, including the search for massless dark photons in $D^0\to\omega\gamma'$ and $D^0\to\gamma\gamma'$, the search for invisible decays of $K^0_S$, the search for dark baryon particles in $\Xi^-\to\pi^-\chi$, the search for massless particles in $\Sigma^+\to p + \rm{invisible}$, and the search for axion-like particles in $J/\psi\to\gamma a$ with $a\to\gamma\gamma$.