Dark Mediator

We show that MUonE can also discover thermal relic dark matter using only its nominal experimental setup. Furthermore, our results show that the downstream ECAL plays a key role in rejecting backgrounds for this search, thereby providing strong motivation for the MUonE to keep this component in the final experimental design.

I work on experimental and cosmological searches of dark sector mediators.

We investigate the cosmological imprints of neutrino-DM-mediator interaction in a model-independent way, including the extra contribution of $N_{\rm eff}$ and the distortion of C$\nu$B. Lyman-$\alpha$ constraint is also discussed. To do this, we implemented a universal approach to solve the time evolution of dark matter in both freeze-in and freeze-out case.

We demonstrate how to search for dark photons by displaced vertex search at the proposed MUonE experiment in the mass range $10~\mathrm{MeV} \le m_{A’} \le 100~\mathrm{MeV}$ and kinetic mixing parameter $10^{-5} \le \epsilon e \le 10^{-3}$, through the process $\mu^{\pm}, e^- \to \mu^{\pm}, e^-, A’$ followed by $A’\to e^+e^-$.