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Scaling ansatz, four zero Yukawa textures, and large θ13

Biswajit Adhikary

Mainak Chakraborty and Ambar Ghosal

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

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

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Phys. Rev. D 86, 013015 – Published 27 July, 2012

DOI: https://doi.org/10.1103/PhysRevD.86.013015

Abstract

We investigate the “scaling Ansatz” in the neutrino sector within the framework of a type-I seesaw mechanism with diagonal charged lepton and right-handed Majorana neutrino mass matrices (MR). We also assume the four zero texture of Dirac neutrino mass matrices (mD) which severely constrain the phenomenological outcomes of such schemes. The scaling Ansatz and the present neutrino data allow only six such matrices out of 126 four zero Yukawa matrices. In this scheme, in order to generate large θ13, we break the scaling Ansatz in mD through a perturbation parameter and we also show that our breaking scheme is radiatively stable. We further investigate CP violation and baryogenesis via leptogenesis in those surviving textures.

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Phys. Rev. D 86, 013015– Published 27 July, 2012
  • Received 6 June 2012

© 2012 American Physical Society

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