Higgs Boson Bounds in Three and Four Generation Scenarios

Details Higgs Boson Bounds in Three and Four Generation Scenarios Higgs Boson Bounds in Three and Four Generation Scenarios

1999-04-20

arxiv.org/abs/hep-ph/9904412v1

Phys.Rev. D60 (1999) 017701

Physics

High Energy Physics

High Energy Physics - Phenomenology

7 pages, 4 figures. To be published in Physical Review D

Scientific paper

10.1103/PhysRevD.60.017701

In light of recent experimental results, we present updated bounds on the lightest Higgs boson mass in the Standard Model (SM) and in the Minimal Supersymmetric extension of the Standard Model (MSSM). The vacuum stability lower bound on the pure SM Higgs boson mass when the SM is taken to be valid up to the Planck scale lies above the MSSM lightest Higgs boson mass upper bound for a large amount of SUSY parameter space. If the lightest Higgs boson is detected with a mass M_{H} < 134 GeV (150 GeV) for a top quark mass M_{top} = 172 GeV (179 GeV), it may indicate the existence of a fourth generation of fermions. The region of inconsistency is removed and the MSSM is salvagable for such values of M_{H} if one postulates the existence of a fourth generation of leptons and quarks with isodoublet degenerate masses M_{L} and M_{Q} such that 60 GeV < M_{L} < 110 GeV and M_{Q} > 170 GeV.

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