Search for the Standard Model Higgs Boson in the Lepton + Missing Transverse Energy + Jets Final State in ATLAS

TL;DR

This paper reports a search for the Standard Model Higgs boson in the lepton, missing energy, and jets final state using ATLAS data, setting limits on production cross sections without observing a significant excess.

Contribution

It provides the first limits on Higgs production in the H→WW→lνjj channel at 7 TeV with 1.04 fb-1 of data, extending previous searches.

Findings

No significant excess observed over background.

Limits set on Higgs production cross section for 240-600 GeV.

Best sensitivity at 400 GeV with a 2.7 times Standard Model prediction upper bound.

Abstract

A search for the Standard Model Higgs boson has been performed in the H \rightarrow WW \rightarrow l{\nu}jj channel in 1.04 fb-1 of pp collisions at \surds = 7 TeV collected with the ATLAS detector at the Large Hadron Collider. No significant excess of events is observed over the expected background and limits on the Higgs boson production cross section are derived for a Higgs boson mass in the range 240 GeV < mH < 600 GeV. The best sensitivity is reached for mH = 400 GeV, where the 95% confidence level upper bound on the cross-section for Higgs boson production times the branching ratio for H \rightarrow W W is 3.1 pb, or 2.7 times the Standard Model prediction.