Physics – High Energy Physics – High Energy Physics - Phenomenology
The Standard Model supplemented with a fourth generation implies significant deviations in the Higgs couplings to gluons and photons compared to the SM prediction. As a consequence, large departure in several Higgs production and decay channels are expected. Recent Higgs search results presented by ATLAS, CMS and CDF hint on the existence of a Higgs boson with a mass around 125 GeV. Using these results and assuming such a light Higgs boson, we derive an exclusion limit on the four generation Standard Model. In particular, for m_H = 125 GeV, a four generation Standard Model is excluded at 99.6% confidence level, while for m_H >= 123 GeV, an exclusion limit above 95% confidence level is found.
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