Physics – High Energy Physics – High Energy Physics - Phenomenology
Scientific paper
2006-12-07
Phys.Lett.B660:508-514,2008
Physics
High Energy Physics
High Energy Physics - Phenomenology
version accepted in Phys. Lett. B
Scientific paper
10.1016/j.physletb.2008.01.043
In an economical system with only two heavy right handed neutrinos, we postulate a new texture for $3 \times 2$ Dirac mass matrix $m_D$. This model implies one massless light neutrino and thus displays only two patterns of mass spectrum for light neutrinos, namely hierarchical or inverse-hierarchical. Both the cases can correctly reproduce all the current neutrino oscillation data with a unique prediction $m_{\nu_e \nu_e} = \frac{\sqrt{\Delta m^2_{solar}}}{3}$ and $\sqrt{\Delta m^2_{atm}}$ for the hierarchical and the inverse-hierarchica cases, respectively, which can be tested in next generation neutrino-less double beta decay experiments. Introducing a single physical CP phase in $m_D$, we examine baryon asymmetry through leptogenesis. Interestingly, through the CP phase there are correlations between the amount of baryon asymmetry and neutrino oscillation parameters. We find that for a fixed CP phase, the hierarchical case also succeeds in generating the observed baryon asymmetry in our universe, plus a non-vanishing $U_{e3}$ which is accessible in future baseline neutrino oscillation experiments.
Brahmachari Biswajoy
Okada Nobuchika
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