2001/03/31 by Christophe Le Mouël, C. Le Mouël
Physics and Astronomy · #Black Holes and Theoretical Physics #Particle physics theoretical and experimental studies #Quantum Chromodynamics and Particle Interactions #hep-ph
paper · pdf · doi:10.1103/physrevd.64.075009
published as Phys.Rev.D64:075009,2001 · 17 pages, 4 figures, version published in Physical Review D
openalex publication_date 2001/09/10 · arxiv created 2001/11/14 · arxiv updated 2011/01/13 · openalex created_date 2025/10/10 · openalex updated_date 2026/07/28
In the minimal supersymmetric extension of the standard model, the charge and color breaking (CCB) vacuum in the plane (H2,tL,tR) typically deviates largely from all D-flat directions, due to the large effects induced by the presence of the top quark Yukawa coupling. As a result, the critical CCB bound on the trilinear soft term At becomes more restrictive than the D-flat bound At2<~3(m_tL2+m_tR2+m22). For large tan\ensuremathβ, we consider the effect of a splitting between the soft squark masses m_tL,m_tR on this optimal CCB bound and give a useful approximation for it, accurate within 1% in all interesting phenomenological cases. The physical implications on the top squark mass spectrum and the one-loop upper bound on the lightest CP-even Higgs boson mass are also discussed in a model-independent way.