Eberhardt, Otto and Herbert, Geoffrey and Lacker, Heiko and Lenz, Alexander and Menzel, Andreas and Nierste, Ulrich and Wiebusch, Martin (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).
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.
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|Publisher Web site:||http://dx.doi.org/10.1103/PhysRevD.86.013011|
|Publisher statement:||Reprinted with permission from the American Physical Society.|
|Date accepted:||No date available|
|Date deposited:||No date available|
|Date of first online publication:||July 2012|
|Date first made open access:||No date available|
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