| Article | |
| Report number | arXiv:1204.3872 ; TTP-12-010 ; CERN-PH-TH-2012-101 ; TTP-12-010 ; CERN-PH-TH-2012-101 |
| Title | Joint analysis of Higgs decays and electroweak precision observables in the Standard Model with a sequential fourth generation |
| Author(s) | Eberhardt, Otto (KIT, Karlsruhe, TTP) ; Herbert, Geoffrey (Humboldt U., Berlin) ; Lacker, Heiko (Humboldt U., Berlin) ; Lenz, Alexander (CERN) ; Menzel, Andreas (Humboldt U., Berlin) ; Nierste, Ulrich (KIT, Karlsruhe, TTP) ; Wiebusch, Martin (KIT, Karlsruhe, TTP) |
| Publication | 2012 |
| Imprint | 18 Apr 2012 |
| Number of pages | 7 |
| In: | Phys. Rev. D 86 (2012) 013011 |
| DOI | 10.1103/PhysRevD.86.013011 |
| Subject category | Particle Physics - Phenomenology |
| Abstract | We analyse the impact of LHC and Tevatron Higgs data on the viability of the Standard Model with a sequential fourth generation (SM4), assuming Dirac neutrinos and a Higgs mass of 125 GeV. To this end we perform a combined fit to the signal cross sections of pp -> H -> gamma gamma,ZZ*,WW* at the LHC, to p pbar -> VH -> V b bbar (V = W, Z) at the Tevatron and to the electroweak precision observables. Fixing the mass of the fourth generation down-type quark b' to 600 GeV we find best-fit values of m_t' = 634 GeV, m_l4 = 107.6 GeV and m_nu4 = 57.8 GeV for the other fourth-generation fermion masses. We compare the chi-square values and pulls of the different observables in the three and four-generation case and show that the data is better described by the three-generation Standard Model. We also investigate the effects of mixing between the third and fourth-generation quarks and of a future increased lower bound on the fourth-generation charged lepton mass of 250 GeV. |
| Copyright/License | Preprint: © 2012-2025 CERN (License: CC-BY-3.0) |
Corresponding record in: Inspire
Element opprettet 2012-04-18, sist endret 2020-06-23
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