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We generalize the geometrical description of CP violation in the standard model in terms of a unitarity triangle. For three left-handed Majorana neutrinos CP violation in the lepton sector is determined by three unitarity triangles. With three additional right-handed neutrinos 15 quadrangles are required to characterize CP violation. We show the relation of the unitarity polygons with physical observables.
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Aguilar–Saavedra et al. (2000) studied this question.
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