Combined tevatron upper limit on gg→H→W⁺W^- and constraints on the Higgs boson mass in fourth-generation fermion models

Abstract

We combine results from searches by the CDF and D0 collaborations for a standard model Higgs boson (H) in the process gg→H→W⁺W^- in pp‾ collisions at the Fermilab Tevatron Collider at √s=1.96 TeV. With 4.8 fb^-1 of integrated luminosity analyzed at CDF and 5.4 fb^-1 at D0, the 95% confidence level upper limit on σ(gg→H)×B(H→ W⁺W^-) is 1.75 pb at m_H=120 GeV, 0.38 pb at m_H =165 GeV, and 0.83 pb at m_H=200 GeV. Assuming the presence of a fourth sequential generation of fermions with large masses, we exclude at the 95% confidence level a standard-model-like Higgs boson with a mass between 131 and 204 GeV.