Abstract

Proof of neutrino masses and mixing from a series of outstanding experimental efforts have opened a window to physics beyond the standard model of particle physics. There are well-defined underlying theories which explain the tiny electron volt neutrino masses. It is well known that Seesaw mechanism has its success in explaining the smallness of neutrino mass. In this talk, I will discuss about the origin of neutrino masses in beyond standard model theories and the testability of these theories in experimental searches. One of the very attractive class of search is lepton number violating search at non-collider and collider experiments, that can probe the Majorana nature of the neutrinos. In my talk, I will particularly focus on neutrinoless double beta decay and the different contributions that can arise from beyond standard model theories, such as, sterile neutrino, Left-Right symmetric model, R-parity violating Supersymmetry. The prediction in neutrinoless double beta decay can be correlated with that of the collider searches that can give very interesting consequences.