Search for the Standard Model Higgs boson in the H -> WW(*) -> l nu l nu decay mode with 4.7 /fb of ATLAS data at sqrt(s) = 7 TeV

TL;DR

This paper reports a search for the Standard Model Higgs boson decaying into WW(*) with leptons, using ATLAS data at 7 TeV, excluding a mass range between 133 and 261 GeV at 95% confidence level.

Contribution

First search using 4.7 fb^{-1} of ATLAS data at 7 TeV to set limits on Higgs boson mass in the WW decay channel.

Findings

No significant excess observed over background.

Excluded Higgs mass range: 133-261 GeV at 95% CL.

Expected exclusion range: 127-233 GeV.

Abstract

A search for the Standard Model Higgs boson in the H -> WW(*) -> l nu l nu (l = e, mu) decay mode is presented. The search is performed using proton-proton collision data corresponding to an integrated luminosity of 4.7 /fb at a centre-of-mass energy of 7 TeV collected during 2011 with the ATLAS detector at the Large Hadron Collider. No significant excess of events over the expected background is observed. An upper bound is placed on the Higgs boson production cross section as a function of its mass. A Standard Model Higgs boson with mass in the range between 133 GeV and 261 GeV is excluded at 95% confidence level, while the expected exclusion range is from 127 GeV to 233 GeV.