Dynamical left-right symmetry breaking.

We study a left–right symmetric model which contains only elementary gauge boson and fermion fields and no scalars. The phenomenologically required symmetry breaking emerges dynamically leading to a composite Higgs sector with a renormalizable effective Lagrangian. We discuss the pattern of symmetry breaking and phenomenological consequences of this scenario. It is shown that a viable top quark mass can be achieved for the ratio of the VEVs of the bi–doublet tanβ ≡ κ/κ ' 1.3–4. For a theoretically plausible choice of the parameters the right–handed scale can be as low as ∼ 20 TeV ; in this case one expects several intermediate and low–scale scalars in addition to the Standard Model Higgs boson. These may lead to observable lepton flavour violation effects including μ→ eγ decay with the rate close to its present experimental upper bound. On leave from National Research Center “Kurchatov Institute”, 123182 Moscow, Russia Email: [email protected] Email: [email protected]–Muenchen.DE Email: [email protected]–Muenchen.DE Email: [email protected]