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T: Fachverband Teilchenphysik

T 15: Flavourphysik (Theorie) II

T 15.6: Talk

Friday, April 1, 2011, 15:20–15:35, 30.23: 3-1

Fourth Generation: Effects of heavy right-handed neutrinos — Markus Bobrowski, •Thomas Neder, and Ulrich Nierste — Karlsruher Institut für Technologie (KIT), Institut für Theoretische Teilchenphysik

In the presence of a sequential fourth generation the additional neutrino states must be sufficiently heavy to comply with the measured invisible width of the Z-boson. This can be achieved in the see-saw framework if only three out of the heavy right-handed neutrinos have masses far above the electroweak scale. An effective theory is constructed in which the three heaviest neutrinos are integrated out. The light left-handed neutrinos become Majorana fermions, new FCNC arise and new interactions of the pseudo-Goldstone bosons occur. We discuss rare flavor-violating lepton decays.