Speaker
Description
As one of the potential candidates for dark matter, the dark photon ($\rm{A}^{'}$) could act as a mediator between dark matter particles, analogous to the photon ($\gamma$) in the Standard Model, which mediates electromagnetic interactions. The dark photon could be detected through its kinetic mixing with the QED photon, with the strength of this coupling suppressed by a factor labeled $\epsilon$. This allows dark photons to be produced in laboratory environments via processes that generate ordinary photons, which can then decay into visible Standard Model final states.
In this presentation, we will present the search for prompt-like massive dark photons produced in Ru+Ru and Zr+Zr collisions at $\sqrt{s_{_{\rm NN}}}$ = 200 GeV, using the STAR detector through the dielectron decay channel. The search focuses on invariant mass range up to 100 MeV/$c^{2}$. The dark photon search is crucial for extending our understanding of new physics beyond the Standard Model.