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Leptogenesis with SU(5)-inspired mass matrices

In the baryogenesis via leptogenesis framework the baryonic asymmetry depends on lepton mass matrices. In a previous paper we used SO(10)-inspired mass matrices and we found few possibilities to obtain a sufficient level of asymmetry. In the present paper

DSF-01/2001

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002 naJ 51 1v1511010/hp-pe:hviXraLeptogenesiswithSU(5)-inspiredmassmatrices

D.FalconeandF.Tramontano

DipartimentodiScienzeFisiche,Universit`adiNapoli,ComplessodiMonteSant’Angelo,ViaCintia,Napoli,Italy

e-mail:falcone@na.infn.it;tramontano@na.infn.it

Inthebaryogenesisvialeptogenesisframeworkthebaryonicasymmetrydependsonleptonmassmatrices.InapreviouspaperweusedSO(10)-inspiredmassmatricesandwefoundfewpossibilitiestoobtainasuf- cientlevelofasymmetry.InthepresentpaperweuseSU(5)-inspiredmassmatrices,whichalsoallowtocheckthedependenceofthebary-onicasymmetryonDiracneutrinomasses.Inparticular,we ndthatthelargemixingmattersolutiontothesolarneutrinoproblem,whichwithinSO(10)givestoosmallasymmetry,cannowbefavoured.

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