Physics – High Energy Physics – High Energy Physics - Phenomenology
Scientific paper
1994-03-30
Nucl.Phys. B437 (1995) 491
Physics
High Energy Physics
High Energy Physics - Phenomenology
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Scientific paper
10.1016/0550-3213(94)00567-X
Analytic expressions of lepton-flavour- and lepton-number-violating decays of charged leptons are derived in the context of general $SU(2)_L\otimes U(1)_Y$ seesaw scenarios that are motivated by grand unified theories (GUT's) or superstring models, in which left-handed and/or right-handed neutral singlets are present. Possible constraints imposed by cosmology and low-energy data are briefly discussed. The violation of the decoupling theorem in flavour-dependent graphs due to the presence of heavy neutral leptons of Dirac or Majorana nature is emphasized. Numerical estimates reveal that the decays $\tau^-\to e^-e^-e^+$ or $\tau^-\to e^-\mu^-\mu^+$ can be as large as $\sim 10^{-6}$, which may be observed in LEP experiments or other $\tau$ factories.
Ilakovac Amon
Pilaftsis Apostolos
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