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We present a search for Standard Model Higgs boson production in the H→ WW→ lνjj channel using 5.7 fb− 1 of CDF II data. A matrix element technique is used to calculate event probability densities for signal and background hypotheses, which are used to calculate a discriminant. The distributions of this discriminant for signal and background are fit to the data using a binned likelihood approach to search for the Higgs boson signal.

We observe no evidence for a Higgs signal and set 95% confidence level upper limits on the production cross section times the branching ratio for σ (pp→ H)× BR (H→ WW)/SM< 12.6 to 76.0 for Higgs boson masses between mH= 150 GeV/c2 to mH= 200 GeV/c2. The expected (median) limit estimated in pseudo-experiments is σ (pp→ H)× BR (H→ WW)/SM< 12.9 to 42.5 at 95% CL for Higgs masses between mH= 150 GeV/c2 and mH= 200 GeV/c2. We also describe the first use of the phi-gap trigger