Bonn 2010 – scientific programme

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T: Fachverband Teilchenphysik

T 22: Neutrinophysik (Theorie) II

T 22.5: Talk

Tuesday, March 16, 2010, 17:45–18:00, HG XV

Fourth Generation Neutrinos — •Dario Schalla and Heinrich Päs — Fakultät für Physik, TU Dortmund, D-44221 Dortmund, Germany

The number of fermion generations is treated as a parameter within the standard model and is fixed to three by experimental observations. The possibility of a yet undiscovered fourth sequential fermion generation will be discussed and motivated for the neutrino sector by considering constraints from direct searches, dark matter searches, neutrinoless double beta decay and leptogenesis. An enhancement of the latter one by the introduction of a fourth generation is investigated in the usual see-saw picture as well as with conformal neutrinos.