Naturalness and Testability of TeV Seesaw Mechanisms

Abstract

After outlining some popular ways to go beyond the standard model so as to generate non-zero but tiny neutrino masses, I focus on several typical seesaw mechanisms and discuss how to get a balance between their theoretical naturalness and their experimental testability. Besides possible collider signatures at the Large Hadron Collider, new and non-unitary CP-violating effects are also expected to show up in neutrino oscillations for type-I, type-(I+II), type-III and double seesaws at the TeV scale.

Comments: 16 pages. References added. Invited talk given at the 16th Yukawa International Seminar (YKIS) Symposium, March 9 - 13, 2009, Kyoto (to appear in the proceedings)