  A search for a Higgs boson has been performed in the H->WW->lvjj channel in
1.04/fb of pp collision data sqrt{s} = 7 TeV recorded 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 H->WW production is 3.1 pb, or 2.7 times
the Standard Model prediction.
