Abstract

The origin of nonzero but tiny neutrino masses has been a big puzzle in particle physics. Among various scenarios of neutrino mass generation which are surviving today, the seesaw mechanisms are most popular for model building. In this chapter we shall first outline a few possible ways to go beyond the standard model (SM) and generate finite neutrino masses, and then focus on several typical seesaw mechanisms and discuss how to get a balance between their theoretical naturalness and experimental testability. Possible collider signatures of TeV seesaw mechanisms and their consequences on non-unitary neutrino mixing and CP violation will also be discussed.

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