Infrared quasifixed solutions in a nonminimal supersymmetric standard model
| Autor: | R. B. Nevzorov, M. A. Trusov |
|---|---|
| Rok vydání: | 2001 |
| Předmět: |
Physics
Nuclear and High Energy Physics Particle physics High Energy Physics::Lattice High Energy Physics::Phenomenology Yukawa potential Parameter space Fixed point Type (model theory) Space (mathematics) Atomic and Molecular Physics and Optics Coupling parameter Higgs boson Grand Unified Theory High Energy Physics::Experiment |
| Zdroj: | Physics of Atomic Nuclei. 64:1299-1314 |
| ISSN: | 1562-692X 1063-7788 |
| Popis: | The considerable part of the parameter space in the MSSM corresponding to the infrared quasi fixed point scenario is almost excluded by LEP II bounds on the lightest Higgs boson mass. In the NMSSM the mass of the lightest Higgs boson reaches its maximum value in the strong Yukawa coupling limit when Yukawa couplings are essentially larger than gauge ones at the Grand Unification scale. In this limit the solutions of the renormalisation group equations are attracted to the infrared and Hill type effective fixed lines or surfaces in the Yukawa coupling parameter space. They are concentrated in the vicinity of quasi fixed points for $Y_i(0)\to\infty$. However the solutions are attracted to such points rather weakly. For this reason when all $Y_i(0)\sim 1$ the solutions of the renormalisation group equations are gathered near a line in the Hill type effective surface. In the paper the approximate solutions for the NMSSM Yukawa couplings are given. The possibility of $b$--quark and $\tau$--lepton Yukawa coupling unification at the scale $M_{X}$ is also discussed. |
| Databáze: | OpenAIRE |
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