Quasi-Fixed Points and Charge and Colour Breaking in Low Scale Models
High Energy Physics - Phenomenology
2009-10-31 v4
Abstract
We show that the current LEP2 lower bound upon the minimal supersymmetric standard model (MSSM) lightest Higgs mass rules out quasi-fixed scenarios for string scales between 10^6 and 10^{11} GeV unless the heaviest stop mass is more than 2 TeV. We consider the implications of the low string scale for charge and colour breaking (CCB) bounds in the MSSM, and demonstrate that CCB bounds from F and D-flat directions are significantly weakened. For scales less than 10^{10} GeV these bounds become merely that degenerate scalar mass squared values are positive at the string scale.
Keywords
Cite
@article{arxiv.hep-ph/9909448,
title = {Quasi-Fixed Points and Charge and Colour Breaking in Low Scale Models},
author = {S. A. Abel and B. C. Allanach},
journal= {arXiv preprint arXiv:hep-ph/9909448},
year = {2009}
}
Comments
17 pages, 4 figures. Replacement has added discussion on errors due to alpha_s(MZ) errors, as well as deviations from the quasi-fixed point. Text has been clarified