Probing TeV scale origin of neutrino mass at future lepton colliders via neutral and doubly-charged scalars

Understand

We point out how future lepton colliders can provide unique insight into the scalar sector of TeV scale models for neutrino masses with local $B-L$ symmetry.

• Our specific focus is on the TeV scale left-right model, which naturally embeds this $B-L$ symmetry.
• In particular, we make a detailed study of the lepton collider implications of the neutral ($H_3$) and doubly-charged ($H^{\pm\pm}$) scalars from the right-handed triplet Higgs that is responsible for the spontaneous breaking of the $B-L$ symmetry and implementing the seesaw mechanism.
• Due to mixing with other scalars, the neutral scalar $H_3$ could acquire sizable flavor violating couplings to the charged leptons.