engleski

Probing lepton-number and lepton-flavor violation in semileptonic tau decays into two mesons

The evaluation, systematic analysis and numerical study of the semileptonic tau-lepton decays with two mesons in the final state has been made in the frame of the standard model extended by right handed neutrinos. In the analysis, heavy-neutrino nondecoupling effects, finite quark masses, quark and meson mixings, finite widths of vector mesons, chiral symmetry breakings in vector-meson--pseudoscalar-meson vertices and effective Higgs-boson--pseudoscalar-meson couplings have been included. Numerical estimates reveal that the decays tau^- -> e^- pi^- pi^+, tau^- -> e^- K^- K^+ and tau^- -> e^- K^0 bar{; ; K}; ; ^0$ have branching ratios of the order of 10^{; ; -6}; ; , close to present-day experimental sensitivities.

tau leptons ; mesons ; neutrinos ; chiral symmetry breaking ; Higgs boson

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