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

Search for Dark Photons in $\gamma\gamma\rightarrow e^+e^-$ at RHIC