Phenomenological Consequences of sub-leading Terms in See-Saw Formulas - INSPIRE

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Phenomenological Consequences of sub-leading Terms in See-Saw Formulas

Feb, 2011

21 pages

Published in:

JHEP 04 (2011) 123

e-Print:

1102.3432 [hep-ph]

DOI:

10.1007/JHEP04(2011)123

View in:

ADS Abstract Service

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Abstract: (arXiv)

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 mu-tau 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.

Neutrino Physics
Beyond Standard Model
seesaw model
neutrino: mass
fermion: heavy
unitarity: violation
mass: hierarchy
neutrino: heavy
neutrino: Majorana
scaling

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