Renormalization Group Study of the Standard Model and its Extensions: II. the Minimal Supersymmetric Standard Model

Details Renormalization Group Study of the Standard Model and its Extensions: II. the Minimal Supersymmetric Standard Model Renormalization Group Study of the Standard Model and its Extensions: II. the Minimal Supersymmetric Standard Model

1993-08-25

arxiv.org/abs/hep-ph/9308335v1

Phys.Rev. D49 (1994) 4882-4901

Physics

High Energy Physics

High Energy Physics - Phenomenology

41 pages. ReVTeX typeset. 8 figures not included but available (as well as a full postscript version of the paper including th

Scientific paper

10.1103/PhysRevD.49.4882

In this paper we summarize the minimal supersymmetric standard model as well as the renormalization group equations of its parameters. We proceed to examine the feasability of the model when the breaking of supersymmetry is parametrized by the soft terms suggested by supergravity theories. In such models, the electroweak symmetry is exact at tree level and is broken spontaneously at one loop order. We make the additional assumption that the GUT-inspired relation $m_b=m_\tau$ be valid at the scale where the gauge coupling constants unify, which constrains the value of the top quark mass. For all types of soft breaking terms expected in supergravity theories, we present the results of numerical runs which yield electroweak breaking at the required scale. These yield not only the allowed ranges for the soft supersymmetry breaking parameters, but also the value of the supersymmetric partner' masses. For example in the strict no-scale model, in which global supersymmetry breaking arises solely from soft supersymmetry breaking parameters, but also the value of the supersymmetric partner' masses. For example in the strict no-scale model, in which global supersymmetry breaking arises solely from soft gaugino masses, we find that $M_t$ can be no heavier than $\sim 127$ GeV.

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