Violation of the Appelquist-Carazzone decoupling in a nonsupersymmetric grand unified theory

2007/07/16 by Piotr H. Chankowski, Jakub Wagner · 2 citations
Physics and Astronomy · #Black Holes and Theoretical Physics #Cosmology and Gravitation Theories #Particle physics theoretical and experimental studies #hep-ph

paper · pdf · doi:10.1103/physrevd.77.025033

published as Phys.Rev.D77:025033,2008 · 17 pages, no figures

arxiv created 2007/07/16 · openalex publication_date 2008/01/30 · arxiv updated 2009/12/01 · openalex created_date 2016/06/24 · openalex updated_date 2026/07/28

Abstract

We point out that in nonsupersymmetric grand unified theories, in which the SU(5) gauge symmetry is broken down to the standard model gauge group by a 24 Higgs multiplet the Appelquist-Carazzone decoupling is violated. This is because the SU(2)_L Higgs triplet contained in the 24 acquires a dimension-full coupling to the SU(2)_L Higgs doublets which is proportional to the grand unified symmetry breaking vacuum expectation value. As a result, at one-loop heavy gauge and Higgs fields contribution to tadpoles generates a vacuum expectation value of the triplet which is not suppressed for V\ensuremath→\ensuremath∞ and violates the custodial symmetry.

Citations

• Phenomenological and cosmological aspects of a minimal GUT scenario
• Unity of All Elementary-Particle Forces
• Infrared singularities and massive fields
• Symmetry breaking and scalar bosons

Cited by

• Higgs triplets, decoupling, and precision measurements
• Electroweak corrections from triplet scalars

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