Displaced lepton flavour violating signatures of right-handed sneutrinos in $U(1)'$ supersymmetric models

Understand

We consider a $U(1)'$ extended supersymmetric model with a right-handed neutrino superfield which can generate light neutrino mass by Type I seesaw mechanism.

• The lighter superpartner of the right-handed neutrino could be the scalar dark matter.
• These right-handed sneutrinos can come from the decay of $\tilde{Z'}$, superpartner of the extra gauge boson $Z'$.
• Left-right handed sneutrino mixings affect their decays further, giving rise to displaced "lepton flavour violating" signatures.