Zero temperature lattice Weinberg-Salam model for the values of the cutoff Λ∼1TeV

The lattice Weinberg-Salam model at zero temperature is investigated numerically. We consider the model for the following values of the coupling constants: the Weinberg angle θ _W∼30°, the fine structure constant α∼(1/150), and the Higgs mass M _H∼ 150GeV. We find that the fluctuational region begins at the values of the cutoff Λ above about 0.8 TeV. In this region the average distance between Nambu monopoles is close to their sizes. At Λ>1.1TeV the Nambu monopole currents percolate. Within the fluctuational region the considered definitions of the scalar field condensate give values that differ from the expected one 2M _z/g _z. We consider the given results as an indication that the nonperturbative effects may be present in the Weinberg-Salam model at the large values of the cutoff. Our numerical results were obtained on the lattices of sizes up to 163×32.