Leptogenesis within a generalized quark-lepton symmetry

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dc.creatorBuccella, F.
dc.creatorFalcone, D.
dc.creatorOliver, L.
dc.date2007-08-15
dc.date2007-10-26
dc.date.accessioned2026-07-07T11:18:39Z
dc.date.available2026-07-07T11:18:39Z
dc.descriptionQuark-lepton symmetry has been shown to be inconsistent with baryogenesis via leptogenesis in natural schemes of the see-saw mechanism. Within the phenomenological approach of textures, we relax this strict symmetry and propose weaker conditions, namely models of the neutrino Dirac mass matrix $M_D$ which have the same hierarchy as the matrix elements of $M_u$. We call this guide-line generalized $hierarchical$ quark-lepton symmetry. We consider in detail particular cases in which the moduli of the matrix elements of $M_D$ are equal to those of $M_u$. Within the phenomenological approach of textures, we try for the heavy Majorana mass matrix diagonal and off-diagonal forms. We find that an ansatz for $M_D$ preserving the hierarchy, together with an off-diagonal model for the heavy Majorana neutrino mass, is consistent with neutrino masses, neutrino mixing and baryogenesis via leptogenesis for an intermediate mass scale $m_R \sim 10^{12}$ GeV. The preservation of the hierarchical structure could come from a possible symmetry scheme.
dc.description12 pages, RevTex4. Title and abstract changed. Revised and enlarged version
dc.identifierhttps://arxiv.org/abs/0708.2000
dc.identifierhttp://arxiv.org/abs/0708.2000
dc.identifierPhys.Rev.D77:033002,2008
dc.identifierdoi:10.1103/PhysRevD.77.033002
dc.identifier.urihttp://salesiana.dossiersoluciones.com/handle/123456789/193415
dc.subjectHigh Energy Physics - Phenomenology
dc.titleLeptogenesis within a generalized quark-lepton symmetry
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