Baryon asymmetry from leptogenesis with four zero neutrino Yukawa textures

Abstract

The generation of the right amount of baryon asymmetry $\eta$ of the Universe from supersymmetric leptogenesis is studied within the type-I seesaw framework with three heavy singlet Majorana neutrinos $N_i(i=1,2,3)$ and their superpartners. We assume the occurrence of four zeroes in the neutrino Yukawa coupling matrix $Y_{\nu }$, taken to be $\mu \tau$ symmetric, in the weak basis where $N_i$ (with real masses $M_i>0$) and the charged leptons $l_{\alpha }(\alpha =e,\mu ,\tau )$ are mass diagonal. The quadrant of the single nontrivial phase, allowed in the corresponding light neutrino mass matrix $m_{\nu }$, gets fixed and additional constraints ensue from the requirement of matching $\eta$ with its observed value. Special attention is paid to flavor effects in the washout of the lepton asymmetry. We also comment on the role of small departures from high scale $\mu \tau$ symmetry due to RG evolution.

arXiv comment35 pages, no figure, Published Version

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• Confronting Four Zero Neutrino Yukawa Textures with $N_2^{}$-dominated Leptogenesis
• A minimal axion model for mass matrices with five texture-zeros