Mass scale of new physics in the absence of the Higgs boson
II. Institut für Theoretische Physik, Universität Hamburg,
Luruper Chaussee 149, 22761 Hamburg, Germany
Received: 20 March 2000 / Revised version: 15 May 2000
Published online: 6 July 2000 - © Springer-Verlag 2000
We consider a hypothetical scenario in which the Higgs boson is absent, and attempt to constrain the mass scale of the new physics that would take its place. Using recent measurements of and MW, we show that, in a class of theories characterized by simple conditions, the upper bound on is close to or smaller than the upper bound on MH in the Standard Model, while in the complementary class is not restricted by our considerations. The issue of fine-tuning when is large is briefly discussed. Observations concerning the magnitude of the Higgs-boson contributions in the Standard Model are included. As a by-product of our considerations, we discuss the usefulness and important properties of a radiative correction, , that directly links with , , and MZ.
Copyright Società Italiana di Fisica, Springer-Verlag 2000