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Neutrino Masses

The neutrino flavours $\nu_e$$\nu_\mu$, and $\nu_\tau$ are defined as weak eigenstates which couple with unit strength to e$\mu$, and $\tau$, respectively. These weak eigenstates are not, in general, states of definite mass, but instead are linear combinations of mass eigenstates , (i = 1,2,3), hence . Here, the unitary matrix Uli describes the mixing strength of mass eigenstates to the corresponding left-handed weak eigenstate. This ansatz is in close analogy to the experimentally observed weak mixing in the quark sector.


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