arXiv:hep-ph/9307334·v1·High Energy Physics — Phenomenology

Unitarity of the Standard Model at the Higgs' Resonance

J. Sirkka · I. Vilja

Abstract

We compute a unitarity bound for higgs mass using one--loop corrected s--wave partial amplitude for $Z_{L} Z_{L} \to Z_{L} Z_{L}$ scattering. We use the equivalence theorem and show that the higgs mass has to be less than $\approx 600$ GeV in order to save the (perturbative) unitarity in the higgs' resonance region. We also discuss about the validity of perturbation expansion in the symmetry breaking sector.

Comments: 6 pages, LaTeX, figures available upon request, TURKU-FL-P9