Lepton flavor violation in tau decays

G. Cvetič, C. Dib, C. S. Kim, J. D. Kim

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We study lepton flavor violation (LFV) in tau decays induced by heavy Majorana neutrinos within two models: (I) the standard model with additional right-handed heavy Majorana neutrinos, i.e., a typical seesawtype model; (II) the standard model with left-handed and right-handed neutral singlets, which are inspired by certain scenarios of SO(10) models and heterotic superstring models with E6 symmetry. We calculate various LFV branching ratios and a T-odd asymmetry. The seesaw model I predicts very small branching ratios for LFV processes in most of the parameter space, although in a very restricted parameter region it can reach maximal branching ratios Br(τ→μγ)∼10-9 and Br(τ→3μ)∼10-10. In contrast, model II may show branching ratios Br(τ→e γ)∼10-8 and Br(τ→3e)∼10-9 over a sizable region of the parameter space, large enough to be tested by experiments in the near future.

Original languageEnglish
Article number034008
Pages (from-to)340081-340089
Number of pages9
JournalPhysical Review D - Particles, Fields, Gravitation and Cosmology
Issue number3
Publication statusPublished - 2002 Aug 1


All Science Journal Classification (ASJC) codes

  • Nuclear and High Energy Physics
  • Physics and Astronomy (miscellaneous)

Cite this

Cvetič, G., Dib, C., Kim, C. S., & Kim, J. D. (2002). Lepton flavor violation in tau decays. Physical Review D - Particles, Fields, Gravitation and Cosmology, 66(3), 340081-340089. [034008].