DOI 10.1007/s100529800795
Studying lepton family violation in lepton-lepton collisions
V.V. Kabachenko1,2 - Yu.F. Pirogov1,2
1 Theory Department,
Institute for High Energy Physics, RU-142284 Protvino,
Moscow Region, Russia
2 Moscow Institute of Physics and Technology, Dolgoprudny, Moscow Region,
Russia
Received: 20 October 1997 / Published online: 23 February 1998
Abstract
In the context of the future high energy - high luminosity electron and
muon colliders, all the relevant four-lepton processes with the lepton family
violation (LFV) are systematically classified. The most general LFV effective
lagrangians are found, and the helicity differential cross sections for the
LFV processes are calculated. The six- and eight-lepton Standard Model
(SM) backgrounds are discussed, and the LFV processes clean of the six-lepton
background are picked out. The possibility to suppress the six-lepton SM
background, when present, by the unnatural initial beam polarizations is
investigated.
It is shown that the four-lepton LFV processes are amenable to experimental
study in the lepton-lepton collisions in the most favourable cases up to
the underlying scale of order 
TeV.
Studying these processes should provide an essential part of the physics
program for the next generation lepton colliders to unravel
the outstanding flavour/family problem.
Copyright Springer-Verlag
