Physics – High Energy Physics – High Energy Physics - Phenomenology
Scientific paper
1997-07-23
Phys.Lett. B415 (1997) 371-382
Physics
High Energy Physics
High Energy Physics - Phenomenology
19 Pages plain latex; includes 6 eps figures. References and comments added. Version to appear in Phys.Lett.B
Scientific paper
10.1016/S0370-2693(97)01274-4
The infra-red fixed points are determined for all the parameters of the MSSM. They dominate the renormalisation group running when the top-Yukawa is in the quasi-fixed point regime (i.e. large at the GUT scale). We examine this behaviour analytically, by solving the full set of one-loop renormalisation group equations in the approximation that the electroweak contributions are negligible, and also numerically. We find the quasi-fixed points for the top-quark trilinear couplings; A_{U_{\alpha 3}} = A_{U_{3\alpha}}=-0.59 m_g independently of the input parameters at the unification scale. All the remaining parameters are significantly focused towards their true fixed points at the weak scale. We examine how this increases the predictivity of the MSSM in this regime.
Abel Steven
Allanach Ben
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