Otto Eberhardt
Joint analysis of Higgs boson decays and electroweak precision observables in the standard model with a sequential fourth generation
Eberhardt, Otto; Herbert, Geoffrey; Lacker, Heiko; Lenz, Alexander; Menzel, Andreas; Nierste, Ulrich; Wiebusch, Martin
Authors
Geoffrey Herbert
Heiko Lacker
Alexander Lenz
Andreas Menzel
Ulrich Nierste
Martin Wiebusch
Abstract
We analyze the impact of LHC and Tevatron Higgs data on the viability of the standard model with a sequential fourth generation, 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→γγ, ZZ∗, WW∗ at the LHC, to pp¯→VH→Vbb¯ (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 mt′=632 GeV, ml4=113.6 GeV and mν4=58.0 GeV for the other fourth-generation fermion masses. We compare the χ2 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.
Citation
Eberhardt, O., Herbert, G., Lacker, H., Lenz, A., Menzel, A., Nierste, U., & Wiebusch, M. (2012). Joint analysis of Higgs boson decays and electroweak precision observables in the standard model with a sequential fourth generation. Physical Review D, 86(1), Article 013011. https://doi.org/10.1103/physrevd.86.013011
Journal Article Type | Article |
---|---|
Publication Date | Jul 1, 2012 |
Deposit Date | Nov 19, 2012 |
Publicly Available Date | Jul 24, 2014 |
Journal | Physical Review D |
Print ISSN | 1550-7998 |
Electronic ISSN | 1550-2368 |
Publisher | American Physical Society |
Peer Reviewed | Peer Reviewed |
Volume | 86 |
Issue | 1 |
Article Number | 013011 |
DOI | https://doi.org/10.1103/physrevd.86.013011 |
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