Lepton number violation

The new leptogenesis scenario is very interesting due to its possible connection to the neutrino sector and lepton number violation. 

AC = 1 weak neutral current (Cl) modes, Lepton number (/.) violating modes or ... 

An introduction is given to the many and varied attempts to deal with the non-perturbative or confinement region of QCD, especially to the lattice approach and to the sum rule method, and to the exciting new ideas about baryon and lepton number violations. Necessarily the treatment of these is rather brief and not very comprehensive. We seek to convey the basic ideas and methods. 

L means lepton number violation e.g. t — e r fl- ). Following common usagerLF means lepton family violation and nor lepton number violation (e.g. t — e 7r+7r ). Smeansbaryon number violation. 

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