2026-07-072026-07-07http://salesiana.dossiersoluciones.com/handle/123456789/54942Callan-Symanzik and renormalization group equation are discussed for the $U(1)$-axial model and it is shown that the symmetric model is not the asymptotic version of the spontaneously broken one due to mass logarithms in the $β$-functions. The Callan-Symanzik equation of the standard model is seen to have the same form as the one of the simple model.8 pages, LaTeX2e, Talk given at Ringberg workshop 1996: "The Higgs puzzle -- What can we learn from LEP II, LHC, NLC, and FMC?"High Energy Physics - TheoryHigh Energy Physics - Phenomenologytext