2000/01/13 by E. Accomando, Elena Accomando, Accomando, E. +5
Physics and Astronomy · #Black Holes and Theoretical Physics #Cosmology and Gravitation Theories #Particle physics theoretical and experimental studies #hep-ph
paper · pdf · doi:10.48550/arxiv.hep-ph/0001121
18 pages, talk presented at SSS-99, Seoul, Korea, June, 1999
arxiv created 2000/01/13 · arxiv updated 2009/11/30
Supersymmetric CP violating phases are examined within the framework of gravity mediated supergravity grand unified models with R parity invariance for models with a light (\stackrel<∼ 1 TeV) particle spectrum. In the minimal model, the nearness of the t quark Landau pole naturally suppresses the t-quark cubic soft breaking parameter at the electroweak scale allowing the electron and neutron experimental electric dipole moment (EDM) constraints to be satisfied with a large GUT scale phase. However, the EDM constraints require that θB, the quadratic soft breaking parameter phase be small at the electroweak scale unless tanβ\stackrel<∼3, which then implies that at the GUT scale this phase must be large and highly fine tuned to satisfy radiative breaking of SU(2)× U(1). Similar results hold for non minimal models, and a possible GUT model is discussed where all GUT scale CP violating phases are naturally small (i.e. O(10-2)). An interesting D-brane model is examined which enhances the size of the phases over much of the parameter space at the electroweak sector for tanβ\stackrel<∼ 5, but still possesses the fine tuning problem at the GUT scale.