Constraints on SUSY seesaw parameters from Leptogenesis and Lepton Flavor Violation

by Dr Frank Deppisch (DESY)

Tuesday Jun 27, 2006, 3:00 PM → 5:00 PM Pacific/Honolulu

WAT 417 (University of Hawai'i, Manoa)

The seesaw mechanism can naturally explain the puzzling smallness of the left-handed neutrino masses, which are suppressed by the heavy masses of the right-handed neutrinos. In its supersymmetric version, the slepton mass matrix receives flavor violating corrections due to virtual effects of the right-handed neutrinos. The lepton flavor violation apparent in the neutrino sector is thus automatically transmitted to the slepton sector. We study the constraints on various minimal supersymmetric seesaw model imposed by neutrino data, charged lepton flavor violation, thermal leptogenesis and perturbativity. We show that it is possible to constrain the heavy Majorana neutrino masses as well as the complex Yukawa coupling matrix. Our results provide a first step towards a seesaw benchmark model for further phenomenological studies and model building. As an alternative to the standard seesaw mechanism we also present the Inverse Seesaw Model that incorporates an extended neutrino sector and in which the heavy neutrino masses can be as low as the electroweak scale. In this extension, lepton flavour violating decays can be enhanced either by flavour violating slepton contributions or by the non-unitarity of the charged current mixing matrix.



Organizer: J.G. Learned