Impact of a Higgs boson at a mass of 126 GeV on the standard model with three and four fermion generations

Alexander Lenz; Andreas Menzel; Geoffrey Herbert; Heiko Lacker; Martin Wiebusch; Otto Eberhardt; Ulrich Nierste

Impact of a Higgs boson at a mass of 126 GeV on the standard model with three and four fermion generations

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arxiv 1209.1101 v2 pith:4APPWL54 submitted 2012-09-05 hep-ph

Otto Eberhardt , Geoffrey Herbert , Heiko Lacker , Alexander Lenz , Andreas Menzel , Ulrich Nierste , Martin Wiebusch This is my paper · ORCID

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We perform a comprehensive statistical analysis of the standard model (SM) with three and four generations using the latest Higgs search results from LHC and Tevatron, the electroweak precision observables (EWPOs) measured at LEP and SLD and the latest determinations of M_W, m_t and alpha_s. For the three-generation case we analyse the tensions in the electroweak fit by removing individual observables from the fit and comparing their predicted values with the measured ones. In particular, we discuss the impact of the Higgs search results on the deviations of the EWPOs from their best-fit values. Our indirect prediction of the top mass is m_t=175.7(+3.0)(-2.2) GeV at 68.3% CL, in good agreement with the direct measurement. We also plot the preferred area in the M_W - m_t plane. The best-fit Higgs mass is 126.0 GeV. For the case of the SM with a perturbative sequential fourth fermion generation (SM4) we discuss the deviations of the Higgs signal strengths from their best-fit values. The H -> gamma gamma signal strength now disagrees with its best-fit SM4 value at more than 4 sigma. We perform a likelihood-ratio test to compare the SM and SM4 and show that the SM4 is excluded at 5.3 sigma. Without the Tevatron data on H -> b bbar the significance drops to 4.8 sigma.

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