Basing on new regularization-renormalization method, the λϕ4
model used in standard model is studied both perturbatively and
nonperturbatively (by Gaussian effective potential). The invariant property of
two mass scales is stressed and the existence of a (Landau) pole is emphasized.
Then after coupling with the SU(2)×U(1) gauge fields, the Higgs mass in
standard model (SM) can be calculated as mH≈138GeV. The critical
temperature (Tc) for restoration of symmetry of Higgs field, the critical
energy scale (μc, the maximum energy scale under which the lower
excitation sector of the GEP is valid) and the maximum energy scale
(μmax, at which the symmetry of the Higgs field is restored) in the
standard model are Tc≈476 GeV, μc≈0.547×1015GeV
and μmax≈0.873×1015 GeVv respectively.Comment: 12 pages, LaTex, no figur