A combined search for the standard model Higgs boson at sqrt{s}=1.96 TeV

TL;DR

This paper reports a comprehensive search for the Standard Model Higgs boson at 1.96 TeV using multiple channels and data sets, setting upper limits on production cross sections without observing a significant signal.

Contribution

It combines new and existing D0 experiment results across various channels to improve constraints on the Higgs boson production at Tevatron energies.

Findings

No significant Higgs signal observed.

Set upper limits on Higgs production cross sections.

Limits are above the Standard Model predictions.

Abstract

We present new results of the search for WH to lepton neutrino b b production in ppbar collisions at a center of mass energy of sqrt{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 MET b b final state, for ZH (to l+l- b b) production, for WH (to WWW) production, and for H (to 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 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 m_H=115 GeV. After combination with the other D0 Higgs boson searches, we obtain for m_H=115 GeV an observed (expected) limit 8.5 (12.1) times higher than the SM predicted Higgs boson production cross section. For m_H=160 GeV, the corresponding observed (expected) ratio is 10.2 (9.0).