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NEUTRINO MASSES, COSMOLOGICAL BOUND AND FOUR ZERO YUKAWA TEXTURES

BISWAJIT ADHIKARY

Saha Institute of Nuclear Physics, 1/AF Bidhannagar, Kolkata 700064, India

Department of Physics, Gurudas College, Narkeldanga, Kolkata 700054, India

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AMBAR GHOSAL

Saha Institute of Nuclear Physics, 1/AF Bidhannagar, Kolkata 700064, India

Corresponding author

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, and

PROBIR ROY

Saha Institute of Nuclear Physics, 1/AF Bidhannagar, Kolkata 700064, India

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https://doi.org/10.1142/S0217732311036693Cited by:12 (Source: Crossref)

Abstract

Four zero neutrino Yukawa textures in a specified weak basis, combined with μτ symmetry and type-I seesaw, yield a highly constrained and predictive scheme. Two alternately viable 3×3 light neutrino Majorana mass matrices m_νA/m_νB result with inverted/normal mass ordering. Neutrino masses, Majorana in character and predicted within definite ranges with laboratory and cosmological inputs, will have their sum probed cosmologically. The rate for 0νββ decay, though generally below the reach of planned experiments, could approach it in some parameter region. Departure from μτ symmetry due to RG evolution from a high scale and consequent CP violation, with a Jarlskog invariant whose magnitude could almost reach 6×10^-3, are explored.

Keywords:

PACS: 14.60.Pq, 11.30.Hv, 98.80.Cq

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