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Searching for New Physics with multilepton events at PADME

The PADME experiment is searching for the Dark Photon $A'$ in the $e^{+}e^{-} \to γA'$ process, assuming a $A'$ decay into invisible particles. In extended Dark Sector models, a Dark Higgs $h'$ can be produced alongside $A'$ in the process $e^{+}e^{-} \to h' A'$. If the $h'$ mass is greater than twice the $A'$ mass the final state will be composed by three $e^{+}e^{-}$ pairs. Such extremely rare process is explorable by the PADME experiment, which could get a first measure and impose limits on models of physics beyond the Standard Model.