Abstract
We analyze the ratio of branching ratios R=BR(H→bb̄)/BR(H→τ+τ−) of Higgs boson decays as a discriminant quantity between supersymmetric and nonsupersymmetric models. This ratio receives large renormalization-scheme independent radiative corrections in supersymmetric models at large tanβ, which are absent in the Standard Model or Two-Higgs-doublet models. These corrections are insensitive to the supersymmetric mass scale. A detailed analysis in the effective Lagrangian approach shows that, with a measurement of ±21% accuracy, the Large Hadron Collider can discriminate between models if the CP-odd Higgs boson mass is below 900 GeV. An e+e− Linear Collider at 500 GeV center of mass energy can discriminate supersymmetric models up to a CP-odd Higgs mass of ∼1.8 TeV.
Highlights
We analyze the ratio of branching ratios R = BR(H → bb)/BR(H → τ +τ −) of Higgs boson decays as a discriminant quantity between supersymmetric and non-supersymmetric models
Last LEP results, suggesting a light neutral Higgs particle with a mass about 115 GeV are encouraging [1], but we will have to wait the news from the hadron colliders, the upgraded Fermilab Tevatron or the upcoming Large Hadron Collider (LHC) at CERN, to see this result either confirmed or dismissed
This simple structure is known to receive large radiative corrections, which have been computed up to two-loop order [6]; a definite prediction is the existence of a light neutral scalar boson with mass below 130 GeV
Summary
Its properties at the tree-level are determined by just two free parameters, conventionally chosen as the ratio of the vacuum expectation values (vev s) of each doublet, tanβ = v2/v1, and the mass of the CP-odd neutral Higgs boson, MA0. This simple structure is known to receive large radiative corrections, which have been computed up to two-loop order [6]; a definite prediction is the existence of a light neutral scalar boson with mass below 130 GeV.
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