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Advisor(s)
Abstract(s)
A detailed analytic and numerical study of baryogenesis through leptogenesis is performed in the framework of the standard model of electroweak interactions extended by the addition of three right-handed neutrinos, leading to the seesaw mechanism. We analyze the connection between GUT-motivated relations for the quark and lepton mass matrices and the possibility of obtaining a viable leptogenesis scenario. In particular, we analyze whether the constraints imposed by SO(10) GUTs can be compatible with all the available solar, atmospheric and reactor neutrino data and, simultaneously, be capable of producing the required baryon asymmetry via the leptogenesis mechanism. It is found that the Just-So(2) and SMA solar solutions lead to a viable leptogenesis even for the simplest SO(10) GUT, while the LMA, LOW and VO solar solutions would require a different hierarchy for the Dirac neutrino masses in order to generate the observed baryon asymmetry. Some implications on CP violation at low energies and on neutrinoless double beta decay are also considered. (C) 2002 Elsevier Science B.V. All rights reserved.
Description
Keywords
Realistic String Model Super-Kamiokande Data Double-Beta Decay SO(10) Grand Unification Oscillation Experiments Baryon Asymmetry Mass Matrices Majorana Neutrinos Number Violation Non-Conservation
Citation
BRANCO, G. C.; FELIPE, R. G.; JOAQUIM, F. R.; REBELO, M. N. - Leptogenesis, CP violation and neutrino data: what can we learn?. Nuclear Physics B. ISSN 0550-3213. Vol. 640, nr. 1-2 (2002), p. 202-232.