Leptonic CP violation phases using an ansatz for the neutrino mass matrix and application to leptogenesis

Salah Nasri, Joseph Schechter, Sherif Moussa

Research output: Contribution to journalArticlepeer-review

11 Citations (Scopus)

Abstract

We further study the previously proposed ansatz, Tr(Mν) = 0, for a prediagonal light Majorana type neutrino mass matrix. If CP violation is neglected this enables one to use the existing data on squared mass differences to estimate (up to a discrete ambiguity) the neutrino masses themselves. If it is assumed that only the conventional CP phase is present, the ansatz enables us to estimate this phase in addition to all three masses. If it is assumed that only the two Majorana CP phases are present, the ansatz enables us to present a one parameter family of solutions for the masses and phases. This enables us to obtain a simple "global" view of lepton number violation effects. Furthermore using an SO(10) motivation for the ansatz suggests an amusing toy (clone) model in which the heavy neutrinos have the same mixing pattern and mass ratios as the light ones. In this case only their overall mass scale is not known (although it is constrained by the initial motivation). Using this toy model we make a rough estimate of the magnitude of the baryon to photon ratio induced by the leptogenesis mechanism. Solutions close to the CP conserving cases seem to be favored.

Original languageEnglish
Article number053005
Pages (from-to)053005-1-053005-13
JournalPhysical Review D - Particles, Fields, Gravitation and Cosmology
Volume70
Issue number5
DOIs
Publication statusPublished - Sept 2004
Externally publishedYes

ASJC Scopus subject areas

  • Nuclear and High Energy Physics

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