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The predicted value of the higgs mass m H is analyzed assuming the existence of the fourth generation of leptons ( N , E ) and quarks ( U , D ). The steep and flat directions are found in the five-dimensional parameter space: m H , m U , m D , m N , m E . The LEPTOP fit of the precision electroweak data is compatible (in particular) with m H ∼ 300 GeV, m N ∼50 GeV, m E ∼100 GeV, m U + m D ∼500 GeV, and | m U − m D |∼75 GeV. The quality of fits drastically improves when the data on b -and c -quark asymmetries and new NuTeV data on deep inelastic scattering are ignored.
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Novikov et al. (2002) studied this question.
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