CDF Logo CDF Search for WZ/WW -> lepton+neutrino+Heavy Flavor Vector Boson Production in 7.5 fb-1 of data
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We report a search for an associated production of Standard Model vector bosons WZ, where the W boson decays leptonically ( W -> l nu) and the Z boson decays to a heavy flavor quark pair (Z -> bb,cc). One identified (``tagged'') heavy flavor jet in the final state is required. The production of WW events where one W decays leptonically and the second W decays into an heavy flavor jet (e.i. W+ -> c-s) contributes to the signal given the small di-jet invariant mass saparation between the W and the Z resonances. This search uses data collected with the CDF II detector at the Tevatron Collider at Fermilab, and correspond to an integrated luminosity of approximately 7.5 fb-1. Events consistent with the signature of a charged lepton (electron or muon), large missing transverse energy and exactly two jets, of which at least one is required to contain a secondary vertex displaced from the jet origin, are selected. A multivariate discriminant based on the Support Vector Machine algorithm is used to reduce greatly the QCD background contribution, given the relaxed lepton selection. A cross section of 1.085 +0.26 -0.40 times the expected Standard Model value for the combined WZ-WW production multiplied by the branching ratio into heavy flavors is measured, consistent with the Standard Model prediction.


Supporting Documents:

  • More details are provided in the public note

    General Remarks:

  • The preliminary results were blessed in the Higgs group on July 19, 2011
  • Please contact us if you have any questions about including these results in a presentation

     Updated by Sandra Leone
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    Last updated: July 20 2011.