CDF Logo CDF Search for Higgs to WW* Production using a Combined Matrix Element and Neural Network Technique
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Abstract:

We present a search for Standard Model (SM) Higgs to WW* production in dilepton plus MET channels using approximately 4.8 fb-1 of integrated luminosity. In order to maximize sensitivity, the multivariate discriminants have been optimized separately for final states with either zero, one, or two or more identified jets. To obtain the best possible sensitivity, we account for potential Higgs signal contibutions originating from gluon fusion, associated production with either a W or Z boson, and vector boson fusion. We also incorporate an analysis of a same-sign dilepton event sample which can potentially contain additional signal events arising from the associated Higgs boson production mechanisms. In the opposite-sign event sample we observe (summing over all jet bins) a total of 1467 candidate events compared against an expectation of 1479 ± 141 background events and 25.4 ± 3.1 signal events for a SM Higgs boson with a mass of 165 GeV/c2. In the same-sign event sample we additionally observe 64 candidate events compared with an expectation of 62 ± 11 background events and 1.7 ± 0.2 signal events. Based on these samples, we determine an observed 95% C.L. upper cross section limit of 1.25 times the SM prediction at NNLL for a Higgs mass of 165 GeV/c2 to be compared with the value for the median of the expected limit (1.28). Results for thirteen other Higgs mass hypotheses ranging from 110 GeV/c2 to 200 GeV/c2 are also presented.

 

Supporting Documents:

  • The results were first presented at EPS 2009
  • More details are provided in the public note
  • Previous multivariate result with 3.6 fb-1: html
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    General Remarks:

  • The preliminary results were blessed in the Higgs group on July 10, 2009
  • Please contact us if you have any questions about including these results in a presentation
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     Updated by Eric James
    For problems or questions regarding this website contact jameseb_AT_fnal.gov
    Last updated: July 10 2009.