Constraints on a Fourth Generation of Fermions from Higgs Boson Searches

<table>Comparison of gluon fusion cross-section within the SM4 and the standard model. Depending on the value of the Higgs mass sizeable deviations of the naive expectation for ratio to be nine is possible. For Higgs masses in the region of 125 GeV this expectation works, however, very well. Figure from [<a href="/journals/ahep/2013/910275/#B116">16</a>].</table>

Advances in High Energy Physics

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Figure 5

Figure 5: Constraints on a Fourth Generation of Fermions from Higgs Boson Searches 