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Flavour Physics and CP Violation

Within the Standard Model and its "conservative" extensions, the available CP violation mechanisms are intimately related to the flavour physics, {\em i.e.} to interactions distinguishing between the fermion generations. Although the Standard Model via its complex Cabibbo-Kobayashi-Maskawa matrix accounts for the observed low energy CP violation in the K- and B-meson systems, the observed baryon asymmetry of the Universe requires additional sources for CP violation. From this point of view it is urgent to look for other mechanisms which might solve this problem. The recent evidence for massive neutrinos turns our attention to the mixing in the lepton sector, which might provide new CP-violating and lepton-number-violating sources.

CP violation; chiral symmetry; flavour symmetry; massive neutrinos; lepton-number violation

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