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Unitarity Quadrangles of Four Neutrino Mixing

Wan-lei Guo, Zhi-zhong Xing

hep-pharXiv:hep-ph/0209017

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.

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