Implications of Higgs Searches on the Four Generation Standard Model

TL;DR

This paper examines how Higgs search results impact the viability of the four generation Standard Model, showing it is largely excluded around 125 GeV based on recent experimental data.

Contribution

It provides the first comprehensive analysis of Higgs search results in the context of the four generation Standard Model, deriving exclusion limits for Higgs masses near 125 GeV.

Findings

Four generation Standard Model is excluded at 99.9% confidence level for m_H = 125 GeV.

Exclusion limits above 95% confidence level are found for 124 GeV <= m_H <= 127 GeV.

Higgs couplings deviations significantly affect production and decay channels.

Abstract

Within the four generation Standard Model, the Higgs couplings to gluons and to photons deviate in a significant way from the predictions of the three generation Standard Model. As a consequence, large departures 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 Higgs boson, we derive exclusion limits on the four generation Standard Model. For m_H = 125 GeV, the model is excluded at 99.9% confidence level. For 124 GeV <= m_H <= 127 GeV, an exclusion limit above 95% confidence level is found.