Quasi-fixed points and charge and colour breaking in low scale models | Zendy

Steven Abel | Zendy; B. C. Allanach | Zendy

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Quasi-fixed points and charge and colour breaking in low scale models

Author(s) -

Steven Abel,

B. C. Allanach

Publication year - 2000

Publication title -

journal of high energy physics

Language(s) - English

Resource type - Journals

SCImago Journal Rank - 0.998

H-Index - 261

eISSN - 1126-6708

pISSN - 1029-8479

DOI - 10.1088/1126-6708/2000/07/037

Subject(s) - higgs boson , physics , particle physics , string (physics) , minimal supersymmetric standard model , scalar (mathematics) , scale (ratio) , degenerate energy levels , charge (physics) , upper and lower bounds , theoretical physics , mathematics , geometry , quantum mechanics , mathematical analysis

We show that the current LEP2 lower bound upon the minimal supersymmetricstandard model (MSSM) lightest Higgs mass rules out quasi-fixed scenarios forstring scales between 10^6 and 10^{11} GeV unless the heaviest stop mass ismore than 2 TeV. We consider the implications of the low string scale forcharge and colour breaking (CCB) bounds in the MSSM, and demonstrate that CCBbounds from F and D-flat directions are significantly weakened. For scales lessthan 10^{10} GeV these bounds become merely that degenerate scalar mass squaredvalues are positive at the string scale.Comment: 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 clarifie

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