Abstract

We search for the Higgs boson produced in association with a Z or W boson. We consider a scenario where Z decays to a pair of neutrinos, or W decays to a charged lepton and neutrino and the electron or muon escape detection; the Higgs boson decays into a b-bbar pair. The data were collected with the CDF II detector at the Tevatron collider at Fermilab, and correspond to an integrated luminosity of 2.1fb-1. The acceptance has been drastically increased with respect to the previous analysis by releasing the cuts on jet ET's and number of jets, and implementing a NN to remove the huge backgrounds that enter as a consequence of the loosening of these cuts. As a result this analysis is sensitive to WH->taunubb decays. An additional NN is used to discriminate the Higgs signal from the remaining backgrounds. We observe no significant excess over predicted backgrounds in CDF data, so we set an expected upper limit on the Standard Model cross section times the branching ratio of 5.6 assuming MH=115GeV, and an observed one of 6.9

Public note for Winter '08 conferences.

General remarks

The results should be considered preliminary until published in a refereed journal. They can be used in conference presentations with proper reference to the CDF Collaboration.

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