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          Institute: MPI für Kernphysik     Collection: Theoretical Particle and Astro-Particle Physics     Display Documents



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ID: 563021.0, MPI für Kernphysik / Theoretical Particle and Astro-Particle Physics
Phenomenological consequences of sub-leading terms in see-saw formulas
Authors:Hettmansperger, Hans; Lindner, Manfred; Rodejohann, Werner
Language:English
Date of Publication (YYYY-MM-DD):2011-04-28
Title of Journal:Journal of High Energy Physics
Journal Abbrev.:JHEP
Volume:2011
Issue / Number:4
Start Page:1
End Page:21
Sequence Number of Article:123
Review Status:not specified
Audience:Experts Only
Abstract / Description:Several aspects of next-to-leading (NLO) order corrections to see-saw formulas are discussed and phenomenologically relevant situations are identified. We generalize the formalism to calculate the NLO terms developed for the type I see-saw to variants like the inverse, double or linear see-saw, i.e., to cases in which more than two mass scales are present. In the standard type I case with very heavy fermion singlets the sub-leading terms are negligible. However, effects in the percent regime are possible when sub-matrices of the complete neutral fermion mass matrix obey a moderate hierarchy, e.g. weak scale and TeV scale. Examples are cancellations of large terms leading to small neutrino masses, or inverse see-saw scenarios. We furthermore identify situations in which no NLO corrections to certain observables arise, namely for μ–τ symmetry and cases with a vanishing neutrino mass. Finally, we emphasize that the unavoidable unitarity violation in see-saw scenarios with extra fermions can be calculated with the formalism in a straightforward manner.
External Publication Status:published
Document Type:Article
Communicated by:N. N.
Affiliations:MPI für Kernphysik/Independent Research Groups/Massive Neutrinos (Werner Rodejohann)
MPI für Kernphysik/Group of M. Lindner
Identifiers:URL:http://arxiv.org/abs/1102.3432 [arxiv version]
DOI:10.1007/JHEP04(2011)123
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