The FineTuning Problem of the Electroweak Symmetry Breaking Mechanism in Minimal SUSY Models
Abstract
We calculate the region of the MSSM parameter space (i.e. $M_{1/2}$, $m_{0}$, $\mu$, \ldots) compatible with a correct electroweak breaking and a realistic topquark mass. To do so we have included {\em all} the oneloop corrections to the effective potential $V_{1}$ and checked their importance in order to obtain consistent results. We also consider the finetuning problem due to the enormous dependence of $M_{Z}$ on $h_{t}$ (the top Yukawa coupling), which is substantially reduced when the oneloop effects are taken into account. We also explore the reliability of the socalled "standard" criterion to estimate the degree of finetuning. As a consequence, we obtain a new set of upper bounds on the MSSM parameters or, equivalently, on the supersymmetric masses perfectly consistent with the present experimental bounds.
 Publication:

arXiv eprints
 Pub Date:
 October 1993
 arXiv:
 arXiv:hepph/9310232
 Bibcode:
 1993hep.ph...10232D
 Keywords:

 High Energy Physics  Phenomenology
 EPrint:
 talk given at the XVI Kazimierz Meeting on Elementary Particle Physics, Kazimierz (Poland) 2428 May 1993, 4 pages in standard LATEX + 2 figures (not included but available upon request), CERNTH.7024/93