Probing origin of neutrino masses through low and high energy processes

I will talk about the possibilities of probing the electroweak scale
 seesaw scenarios through low and high energy processes. My main focus will be
 for the seesaw scale in the range M_N ~ few GeV and M_N ~ 100 GeV -  1 TeV.
 In the former case various Lepton number violating~(LNV) meson decays at
 ongoing beam dump experiments and in the later case a variety of final states
 including single and multi leptonic modes in association with jets at pp, e+e-,
 egamma, gammagamma colliders are useful to probe the seesaw scale. I will
 also talk about how a linear seesaw model which is based on two higgs doublet
 models can provide distinctive production mechanisms for seesaw mediators and
 give striking LNV signatures.