Abstract
If neutrinos are Dirac, the conditions for cobimaximal mixing, i.e. θ23=π/4 and δCP=±π/2 in the 3×3 neutrino mixing matrix, are derived. One example with A4 symmetry and radiative Dirac neutrino masses is presented.
Highlights
Neutrinos are mostly assumed to be Majorana
Scotogenic Dirac Neutrinos with Cobimaximal Mixing : The other approach to obtaining UCBM is through Eq (5)
Let it be denoted as M2ss and assuming that its entries are all much smaller the invariant masses of s and s, it is clear that the Dirac neutrino mass matrix in the basis of Fig. 1 is proportional to M2ss and is real up to an unobservable phase, i.e. the relative phase of fN and fE
Summary
Neutrinos are mostly assumed to be Majorana. The associated 3×3 mass matrix has been studied in numerous papers. To understand the cobimaximal mixing matrix UCBM , consider its form in the PDG (1/ 2)(−s12 ± ic12s13) (1/ 2)(c12 ± is12s13) c13/ 2 In Eq (1), the neutrino basis is chosen for which the charged-lepton mass matrix Ml is diagonal which links the left-handed (e, μ, τ ) to their right-handed counterparts.
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