Mass scale of new physics in the absence of the Higgs boson

B.A. Kniehl; A. Sirlin

doi:doi:10.1007/s100520000446

EPJ

Mass scale of new physics in the absence of the Higgs boson

B.A. Kniehl - A. Sirlin

II. Institut für Theoretische Physik, Universität Hamburg, Luruper Chaussee 149, 22761 Hamburg, Germany

Abstract
We consider a hypothetical scenario in which the Higgs boson is absent, and attempt to constrain the mass scale $\Lambda$ of the new physics that would take its place. Using recent measurements of $\sin^2\theta_{\mathrm{eff}}^{\mathrm{lept}}$ and M_W, we show that, in a class of theories characterized by simple conditions, the upper bound on $\Lambda$ is close to or smaller than the upper bound on M_H in the Standard Model, while in the complementary class $\Lambda$ is not restricted by our considerations. The issue of fine-tuning when $\Lambda$ 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, $\Delta r_{\mathrm{eff}}$ , that directly links $\sin^2\theta_{\mathrm{eff}}^{\mathrm{lept}}$ with $\alpha$ , $G_\mu$ , and M_Z.

15th European Conference on Atoms Molecules and Photons (ECAMP)
June 30 to July 4, 2025
Innsbruck, Austria

EPJ

Mass scale of new physics in the absence of the Higgs boson

Conference announcements