Speaker
Description
This talk is based on our recent paper arXiv:2109.10093.
The MUonE collaboration intends to assess the hadronic vacuum polarization contribution to the muon $g-2$ via the elastic scattering process $\mu e \to \mu e$. I will discuss the prospects of probing the $L_{\mu}−L_{\tau}$ gauge boson at the MUonE experiment. The $L_{\mu}−L_{\tau}$ gauge boson $Z′$, which can explain the reported muon $g-2$ discrepancy, can be produced at the MUonE experiment through the process $\mu e \to \mu eZ′$. The background events coming from the elastic scattering $\mu e \to \mu e$ as well as radiative process $\mu e \to \mu e \gamma$ can be removed by the kinematical cuts on the muon scattering angle and the electron energy, in addition to a photon veto. With our selection criteria, the number of signal events $\mu e \to \mu eZ′$ is found to be as large as $∼10^3$ in the parameter region motivated by the muon $g−2$ discrepancy. Our result shows that the MUonE experiment is also sensitive to new physics and therefore it can serve a double purpose.
