Lepton portal dark matter at muon colliders: Total rates and generic features for phenomenologically viable scenarios

Lepton portal dark matter (DM) models are a class of where the DM candidates solely couple to charged leptons through mediator carrying lepton number. These very interesting since they avoid constraints from direct detection experiments even for coupling order ${\cal O}(1)$, have small annihilation cross sections, and can be probed efficiently at colliders. In this work, we consider minimal model which consists extending SM with two $SU(2)_L$ singlets: scalar singlet an electrically neutral right-handed fermion. We systematically study production mechanisms multi-TeV muon After considering all possible theoretical experimental studying phenomenology flavour violation in muon-philic scenario, analyse rates 54 channels (26 prompt 28 production) Finally, discuss collider signatures some corresponding backgrounds. find that least 9 efficient testing masses up about $1$ TeV.