Abstract
Taking the tri-bimaximal flavor mixing pattern as a particular basis, we propose a new way to expand the 3×3 unitary Pontecorvo-Maki-Nakagawa-Sakata (PMNS) lepton flavor mixing matrix U in powers of the magnitude of its smallest element ξ≡|Ue3|≃0.149. Such a Wolfenstein-like parametrization of U allows us to easily describe the salient features and fine structures of flavor mixing and CP violation, both in vacuum and in matter.
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