1999/07/21 by Elena Accomando, E. Accomando, R. Arnowitt +2 · 6 citations
Physics and Astronomy · #Dark Matter and Cosmic Phenomena #Neutrino Physics Research #Particle physics theoretical and experimental studies #hep-ph
paper · pdf · doi:10.1103/physrevd.61.115003
published as Phys.Rev.D61:115003,2000 · 28 pages, latex, 15 figures
arxiv created 1999/07/21 · openalex publication_date 2000/05/08 · arxiv updated 2009/11/30 · openalex created_date 2016/06/24 · openalex updated_date 2026/07/28
The question of CP violating phases in supersymmetry and electric dipole moments (EDMs) is considered within the framework of supergravity grand unification (GUT) models with a light (\ensuremath\lesssim1 TeV) mass spectrum. In the minimal model, the nearness of the t-quark Landau pole automatically suppresses the t-quark cubic soft breaking phase at the electroweak scale. However, current EDM data require the quadratic soft breaking phase to be small at the electroweak scale unless tan\ensuremathβ is small (tan\ensuremathβ\ensuremath\lesssim3), and the EDM data combined with the requirement of electroweak symmetry breaking require this phase to be both large and highly fine-tuned at the GUT scale unless tan\ensuremathβ is small. Nonminimal models are also examined and generally show the same behavior.