Four-zero neutrino Yukawa textures in the minimal seesaw framework

Journal Article · Sat Mar 01 04:00:00 EST 2008 · Physical Review. D, Particles Fields

DOI:https://doi.org/10.1103/PHYSREVD.77.053011· OSTI ID:21249694

Branco, Gustavo C; Emmanuel-Costa, David ^[1]; Rebelo, M N ^[1]; Roy, Probir ^[2]

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1. Departamento de Fisica and Centro de Fisica Teorica de Particulas (CFTP), Instituto Superior Tecnico (IST), Avenida Rovisco Pais, 1049-001 Lisboa (Portugal)
2. Tata Institute of Fundamental Research, Homi Bhabha Road, Mumbai 400 005 (India)

We investigate, within the type I seesaw framework, the physical implications of zero textures in the Yukawa couplings which generate the neutrino Dirac mass matrix m{sub D}. It is shown that four is the maximal number of texture zeros compatible with the observed leptonic mixing and the assumption that no neutrino mass vanishes. We classify all allowed four-zero textures of m{sub D} into two categories with three classes each. We show that the different classes, in general, admit CP violation both at low and high energies. We further present the constraints obtained for low energy physics in each case. The role of these zero textures in establishing a connection between leptogenesis and low energy data is analyzed in detail. It is shown that it is possible in all cases to completely specify the parameters relevant for leptogenesis in terms of light neutrino masses and leptonic mixing together with the unknown heavy neutrino masses.

• OSTI ID: 21249694
• Journal Information: Physical Review. D, Particles Fields, Journal Name: Physical Review. D, Particles Fields Journal Issue: 5 Vol. 77; ISSN PRVDAQ; ISSN 0556-2821
• Country of Publication: United States
• Language: English

Related Subjects

72 PHYSICS OF ELEMENTARY PARTICLES AND FIELDS
COUPLING
CP INVARIANCE
LEPTONS
MASS
MATRICES
MIXING
NEUTRINOS
TEXTURE
YUKAWA POTENTIAL