Combined CDF and D0 upper limits on gg->H W+W- and constraints on the Higgs boson mass in fourth-generation fermion models with up to 8.2 fb-1 of data

TL;DR

This paper combines results from CDF and D0 to set upper limits on Higgs production and decay at the Tevatron, and constrains the Higgs mass range in models with a fourth fermion generation using up to 8.2 fb-1 of data.

Contribution

It provides the first combined limits on gg->H->W+W- and ZZ channels and constrains the Higgs mass in fourth-generation models with extensive Tevatron data.

Findings

Excluded Higgs mass between 124 and 286 GeV in fourth-generation models.

Set upper limits on Higgs production cross section at various masses.

Achieved the most stringent limits at the Tevatron for these channels.

Abstract

We combine results from searches by the CDF and D0 Collaborations for a standard model Higgs boson (H) in the processes gg->H->W+W- and gg->H->ZZ in p-pbar collisions at the Fermilab Tevatron Collider at sqrt(s)=1.96 TeV. With 8.2 fb-1 of integrated luminosity analyzed at CDF and 8.1 fb-1 at D0, the 95% C.L. upper limit on sigma(gg->H)xBr(H->W+W-) is 1.01 pb at m_H=120 GeV, 0.40 pb at m_H=165 GeV, and 0.47 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 124 and 286 GeV.