Search for Standard Model Higgs Boson Production in Association with
a W Boson with 2.7 fb-1 of CDF Data

 




Introduction:

We present a search for Standard Model Higgs Boson production in association with a W boson using 2.7 fb-1 of CDF data. We select events with a high-pT lepton, a neutrino, and two jets. At least one of the jets must be identified as a b-quark jet (tagged). We optimized two multivariate discriminants designed to separate signal from background. One discriminant uses complementary Matrix Element and Boosted Decision Tree techniques. The other uses Neural Networks. We perform binned likelihood fits of the discriminants and set 95% confidence level upper limits on the WH production cross section times branching ratio as a function of Higgs mass.




Main Analysis Web Pages:

  • Using Matrix Element and Boosted Decision Tree Techniques (ME+BDT) main analysis web page

  • Using Neural Network (NN) Technique main analysis web page





Results -- Limits:

  • Expected and observed upper limit cross sections in SM units for different Higgs mass points using ME+BDT:

    • mH (GeV) Expected (&sigma/SM) Observed (&sigma/SM)
    100 4.07 3.52
    105 4.28 4.19
    110 4.82 6.67
    115 5.64 5.75
    120 7.02 7.98
    125 8.32 8.36
    130 10.7 11.7
    135 14.2 20.5
    140 20.8 26.1
    145 29.4 54.5
    150 52.1 107.6

  • Expected and observed upper limit cross sections in SM units for different Higgs mass points using NN:

    • mH (GeV) Expected (&sigma/SM) Observed (&sigma/SM)
    100 4.3 3.6
    105 4.6 3.7
    110 5.0 3.5
    115 5.8 5.0
    120 6.9 5.7
    125 8.2 8.7
    130 10.0 9.3
    135 13.8 14.9
    140 19.4 25.2
    145 28.9 34.9
    150 43.2 62.9




Public Notes:



Last modified: Fri Aug 1 16:07:28 CDT 2008