6533b82cfe1ef96bd128f691
RESEARCH PRODUCT
Flavour-violating charged lepton decays in seesaw-type models
Apostolos PilaftsisAmon Ilakovacsubject
PhysicsNuclear and High Energy PhysicsParticle physicsDirac (video compression format)High Energy Physics::PhenomenologyFOS: Physical sciencesSuperstring theoryContext (language use)Lepton flavour violation ; seesaw ; singlet Majorana/Dirac neutrinosType (model theory)CosmologyHigh Energy Physics - PhenomenologyMAJORANAHigh Energy Physics - Phenomenology (hep-ph)Seesaw molecular geometryHigh Energy Physics::ExperimentLeptondescription
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.
| year | journal | country | edition | language |
|---|---|---|---|---|
| 1994-03-30 |