We present new results of the search for WH →bb production in ppˉ collisions at a center-of-mass energy of √s = 1.96 TeV, based ona dataset with integrated luminosity of 0.44 fb1. We combine these new results with previously published searches by the D0 collaboration,for WH and ZH production analyzed in the /ET b ˉb final state, for ZH (→+b b) production, for WH (→WWW) production, and for H(→WW) direct production. No signal-like excess is observed either in theWH analysis or in the combination of all D0 Higgs boson analyses.Weset 95 C.L. (expected) upper limits on σ(pp→WH)×B(H →bb) ranging from 1.6 (2.2) pb to 1.9 (3.3) pb for Higgs boson masses between105 and 145 GeV, to be compared to the theoretical prediction of 0.13 pb for a Standard Model (SM) Higgs boson with mass mH = 115 GeV.After combination with the other D0 Higgs boson searches, we obtain for mH = 115 GeV an observed (expected) limit 8.5 (12.1) times higherthan the SM predicted Higgs boson production cross section. For mH = 160 GeV, the corresponding observed (expected) ratio is 10.2 (9.0).
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