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SACLAY-T02/015 LARGE SOLAR ANGLE AND SEESAW MECHANISM: A BOTTOM-UP PERSPECTIVE (2002)
BibTeX
@MISC{Lavignac02saclay-t02/015large,
author = {Stéphane Lavignac and Isabella Masina and Carlos A. Savoy},
title = {SACLAY-T02/015 LARGE SOLAR ANGLE AND SEESAW MECHANISM: A BOTTOM-UP PERSPECTIVE},
year = {2002}
}
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Abstract
In addition to the well established large atmospheric angle, a large solar angle is probably present in the leptonic sector. In the context of the see-saw and by means of a bottom-up approach, we explore which patterns for the Dirac and Majorana right-handed mass matrices provide two large mixings in a robust way and with the minimal amount of tuning. Three favourite patterns emerge, which have a suggestive physical interpretation in terms of the role played by right-handed neutrinos: in both solar and atmospheric sectors, either a single or a pseudo-Dirac pair of right-handed neutrinos dominates. Each pattern gives rise to specific relations among the neutrino mixing angles and mass differences, which lead to testable constraints on Ue3. The connection with the rate of LFV charged lepton decays is also addressed.
Keyphrases
bottom-up perspective large solar angle seesaw mechanism neutrino mixing angle bottom-up approach atmospheric sector robust way right-handed neutrino minimal amount lepton decay large solar angle favourite pattern emerge mass difference majorana right-handed mass matrix large mixing testable constraint leptonic sector large atmospheric angle pseudo-dirac pair suggestive physical interpretation right-handed neutrino dominates specific relation
