Unitarity Quadrangles of Four Neutrino Mixing

Abstract

We present a classification of the unitarity quadrangles in the four-neutrino mixing scheme. We find that there are totally thirty-six distinct topologies among twelve different unitarity quadrangles. Concise relations are established between the areas of those unitarity quadrangles and the rephasing invariants of CP and $T$ violation.

arXiv commentRevTex 10 pages. Minor changes made. Accepted for publication in Phys. Rev. D

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• Reconstruction of the Neutrino Mixing Matrix and Leptonic Unitarity Triangles from Long-baseline Neutrino Oscillations
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• Prospects for Reconstruction of Leptonic Unitarity Quadrangle and Neutrino Oscillation Experiments
• Test of the 4-th quark generation from the Cabibbo-Kobayashi-Maskawa matrix