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Large θ ν 13 and uniﬁed description of quark and lepton mixing matrices

We present a revised version of the so-called “yukawaon model”, which was proposed for the purpose of a uniﬁed description of the lepton mixing matrix U PMNS and the quark mixing matrix V CKM . It is assumed from a phenomenological point of view that the neutrino Dirac mass matrix M D is given with a somewhat different structure from the charged lepton mass matrix M e , although M D = M e was assumed in the previous model. As a result, the revised model predicts a reasonable value sin 2 2 θ 13 ∼ 0 . 07 with keeping successful results for other parameters in U PMNS as well as V CKM and quark and lepton mass ratios.