CDF Search for WZ/WW -> lepton+neutrino+Heavy Flavor Vector Boson Production in 7.5 fb-1 of data|
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
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.
More details are provided in the public note
The preliminary results were blessed in the Higgs group on July 19, 2011
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Updated by Sandra Leone
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Last updated: July 20 2011.