  The fundamental nature of Dark Matter remains one of the major mysteries of
modern physics. Some models postulate the existence of a massive gauge boson, a
"dark photon" ($A^\prime$), that may allow Dark Matter particles to interact
with Standard Model particles. Ultra-relativistic heavy-ion collisions produce
highly Lorentz-contracted electromagnetic fields with sufficient energy density
to potentially manifest as light dark photons. We report limits on dark photon
parameters via a search for anomalous production of $e^+e^-$ pairs in $\gamma
A^\prime$ and $A^\prime A^\prime$ fusion from ultra-peripheral
$\rm{Au}+\rm{Au}$ collisions. This study utilizes measurements of the
Breit-Wheeler process ($\gamma\gamma \rightarrow e^+e^-$) carried out by STAR,
specifically making use of polarization-dependent final-state azimuthal
asymmetries in $e^+e^-$ pairs. These limits are informative for future searches
in the ultra-peripheral heavy-ion collisions and to constrain future
theoretical developments of the dark photon mechanism.
