0000000000348961
AUTHOR
Werner Rodejohann
Theory of Neutrinos: A White Paper
During 2004, four divisions of the American Physical Society commissioned a study of neutrino physics to take stock of where the field is at the moment and where it is going in the near and far future. Several working groups looked at various aspects of this vast field. The summary was published as a main report entitled ``The Neutrino Matrix'' accompanied by short 50 page versions of the report of each working group. Theoretical research in this field has been quite extensive and touches many areas and the short 50 page report provided only a brief summary and overview of few of the important points. The theory discussion group felt that it may be of value to the community to publish the e…
Two-Higgs-doublet models with a flavored Z2 symmetry
Two-Higgs-doublet models usually consider an ad-hoc Z2 discrete symmetry to avoid flavor changing neutral currents. We consider a new class of two-Higgs-doublet models where Z2 is enlarged to the symmetry group F⋊Z2, i.e., an inner semidirect product of a discrete symmetry group F and Z2. In such a scenario, the symmetry constrains the Yukawa interactions but goes unnoticed by the scalar sector. In the most minimal scenario, Z3⋊Z2=D3, flavor changing neutral currents mediated by scalars are absent at tree and one-loop level, while at the same time predictions to quark and lepton mixing are obtained, namely a trivial Cabibbo-Kobayashi-Maskawa matrix and a Pontecorvo-Maki-Nakagawa-Sakata matr…
Working group report: Neutrino physics
This is the report of the neutrino physics working group at WHEPP-X. We summarize the problems selected and discussed at the workshop and the papers which have resulted subsequently.
Symmetrical Parametrizations of the Lepton Mixing Matrix
Advantages of the original symmetrical form of the parametrization of the lepton mixing matrix are discussed. It provides a conceptually more transparent description of neutrino oscillations and lepton number violating processes like neutrinoless double beta decay, clarifying the significance of Dirac and Majorana phases. It is also ideal for parametrizing scenarios with light sterile neutrinos.