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Neutrino Mixing: $A_4$ Variations · Around

2015

Neutrino Mixing: $A_4$ Variations

Ma, Ernest

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In the context of the non-Abelian discrete symmetry $A_4$, the neutrino mass matrix has been studied extensively.

A brief update is presented to focus on the conceptual shift from tribimaximal mixing ($\theta_{13} = 0$, $\theta_{23} = \pi/4$, $\tan^2 \theta_{12} = 1/2$) to $\underline{\rm cobimaximal}$ mixing ($\theta_{13} \neq 0$, $\theta_{23} = \pi/4$, $\delta_{CP} = \pm \pi/2$) which agrees well with present data.
Three specific realistic examples are proposed, two with three and the third with just two parameters.

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