Research Papers in Physics and Astronomy

 

Date of this Version

April 2008

Comments

Published in Physics Letters B 663 (2008) 26–36. Copyright © 2008 Elsevier B.V. Used by permission.

Abstract

We present new results of the search for WH → ℓνbb production in pp collisions at a center-of-mass energy of √s = 1.96 TeV, based on a dataset with integrated luminosity of 0.44 fb−1. We combine these new results with previously published searches by the D0 collaboration, for WH and ZH production analyzed in the ETbb final state, for ZH (→ℓ+-bb) production, for WH (→WWW) production, and for H (→WW) direct production. No signal-like excess is observed either in the WH analysis or in the combination of all D0 Higgs boson analyses.We set 95% C.L. (expected) upper limits on σ(ppWHB (Hbb) ranging from 1.6 (2.2) pb to 1.9 (3.3) pb for Higgs boson masses between 105 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 higher than 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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