Quasi-Fixed Points and Charge and Colour Breaking in Low Scale Models

Details Quasi-Fixed Points and Charge and Colour Breaking in Low Scale Models Quasi-Fixed Points and Charge and Colour Breaking in Low Scale Models

1999-09-21

arxiv.org/abs/hep-ph/9909448v4

JHEP 0007 (2000) 037

Physics

High Energy Physics

High Energy Physics - Phenomenology

17 pages, 4 figures. Replacement has added discussion on errors due to alpha_s(MZ) errors, as well as deviations from the quas

Scientific paper

10.1088/1126-6708/2000/07/037

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.

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