Nonzero θ13 and leptogenesis in a type-I seesaw model with A4 symmetry

Biswajit Karmakar and Arunansu Sil
Phys. Rev. D 91, 013004 – Published 14 January 2015

Abstract

In light of the recent discovery of nonzero θ13, we have analyzed the Altarelli-Feruglio A4 flavor symmetry model extended with additional flavon. The inclusion of the new field leads to the deviation from the exact tri-bimaximal neutrino mixing pattern in the context of a type-I seesaw by producing a nonzero θ13 consistent with the recent experimental results at the leading order. A sum rule for light neutrino masses is also obtained in this context. The setup constrains the two Majorana phases involved in the lepton mixing matrix in terms of A4 parameter space. We have shown that a nonzero lepton asymmetry can be generated while next-to-leading order contributions to the neutrino Yukawa couplings are considered. The two Majorana phases play a crucial role in CP-asymmetry parameter and the involvement of θ13 in it, is exercised.

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  • Received 5 August 2014

DOI:https://doi.org/10.1103/PhysRevD.91.013004

© 2015 American Physical Society

Authors & Affiliations

Biswajit Karmakar* and Arunansu Sil

  • Indian Institute of Technology Guwahati, 781039 Assam, India

  • *k.biswajit@iitg.ernet.in
  • asil@iitg.ernet.in

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Vol. 91, Iss. 1 — 1 January 2015

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