New Physics Searches at BESIII

TL;DR

This paper reviews recent BESIII experimental results searching for new physics phenomena like dark matter and related particles, focusing on potential signals within the GeV mass range that could address Standard Model shortcomings.

Contribution

It presents new experimental constraints and searches for light new particles such as dark photons, axion-like particles, and dark baryons, motivated by dark matter and matter-antimatter asymmetry issues.

Findings

Constraints on dark photon parameters

Searches for light Higgs bosons and axion-like particles

Potential signals for dark baryons in BESIII data

Abstract

This report highlights the recent BESIII results related to the new physics searches motivated by the shortcomings of Standard Model, such as the exclusion of dark matter (DM). DM has so far been inferred only through astrophysical observations and accounts for a large fraction of matter density of the universe. DM may couple to SM particles via various portals. These portals give rise to several possible new particles beyond the SM, such as light Higgs bosons, dark photons, axion-like particles, or spin-1/2 fermions. Furthermore, the origin of DM and the observed asymmetry between visible matter and antimatter may be connected through the introduction of a dark baryon. The signature of these new physics particles could be accessible by the BESIII if their masses lie in the few-GeV range.