On t-quark decay

Abstract

An extended electroweak model with second-rank antisymmetric tensor fields was proposed. The effective interactions resulting from the exchange of these fields have a specific dependence on the momentum transfer. This leads to the introduction of new model-independent muon decay parameters (M.V. Chizhov, Mod. Phys. Lett. A 9 (1994) 2979), which can be measured experimentally in SLAC and TRIUMF. The new tensor interactions can affect the three-particle semileptonic meson decays (M.V. Chizhov, Mod. Phys. Lett. A 8 (1993) 2753). In this connection it will be interesting to carry out new experiments on K + → l + νγ, K + → π 0 l + ν decays at DAφNE. The K L-K S mass difference sets constraints to the tensor particles masses. The mass of the lightest tensor particle could be less than the t-quark mass. Therefore, the lightest tensor particle may give an additional W-boson contribution to the t-quark decay with the same signature. In this Letter we have calculated the contribution of the new tensor particles to the t-quark decay.