signature=27491bb977cf3f8ff6afb0b38b2f05dc,Search for VH prodiuction in the ET +b-jets signature in ...

摘要：

We present a search for a low-mass SM Higgs boson produced in association with a vector boson (VH) where H decays to b¯b and the vector boson decays escape detection. We are sensitive to ZH → ννb¯b, W H → ℓνb¯b (with the lepton not identified), and to a much lesser extent to ZH → ℓℓb¯b.This search is an update of the search using 7.8 fb-1 of CDF data presented at EPS- HEP2011 with the full CDF dataset, i.e. 9.45 fb-1. Improvements include a new determination of the jet energy corrections, which now depends on the type of the jet (quark jet or gluon jet), as well as the use of an artificial neural network to improve the jet energy resolution.Observing no significant excess in the data, we set 95% confidence level upper limits on the V H production cross-section times branching fraction to b¯b for values of the Higgs mass (mH ) between 90 and 150 GeV/c2. For mH = 125 GeV/c2, we set an observed (expected) limit of 6.7 (3.6) times the SM prediction.We re-interpret this result in a search for W Z + ZZ production, with Z → b¯b, and measure a cross-section compatible with SM prediction.

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