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Abstract: (APS)
We study the effects of induced four-fermion contact interactions, which arise when leptons and quarks are considered as composite objects, on the leptonic decays of the τ. The current experimental values on the leptonic τ decays can be used to put limits on the scale of compositeness, which can be as high as Λe>8.1 TeV and Λμ>6.5 TeV for the decay modes into an electron and muon, respectively.
  • tau: leptonic decay
  • leptonic decay: tau
  • four-fermion interaction
  • fermion: composite
  • Lambda parameter
  • tau: branching ratio
  • numerical calculations: interpretation of experiments
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