München 2009 – wissenschaftliches Programm
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T: Fachverband Teilchenphysik
T 21: Neutrinophysik (Theorie) 2
T 21.2: Vortrag
Freitag, 13. März 2009, 14:15–14:30, M109
Large gauge-invariant non-standard neutrino interaction — •Toshihiko Ota1, Belen Gavela2, Daniel Hernandez2, and Walter Winter1 — 1Institut fuer Theoretische Physik und Astrophysik, Universitaet Wuerzburg, Wuerzburg, Germany — 2Departamento de Fisica Teorica and Instituto de Fisica Teorica UAM/CSIC, Universidad Autonoma de Madrid, Madrid, Spain
We discuss possible models for non-standard neutrino interactions by decomposing all possible dimension six and eight effective operators by their tree-level mediators. Taking into account the constraints from four charged lepton interactions, electroweak precision data, lepton universality, and the non-unitarity of the lepton mixing matrix, we find that large non-standard neutrino interactions from dimension eight operators are phenomenologically allowed in all flavour channels, and show that at least two new mediator particles and some cancellation conditions are required.