Combined SM Higgs Limits at the Tevatron

We combine results from CDF and D0 on direct searches for a standard model (SM) Higgs boson (H) in p(bar p) collisions at the Fermilab Tevatron at √s = 1.96 TeV. Compared to the previous Higgs Tevatron combination, more data and new channels WH → τνb(bar b), VH → ττb(bar b)/jjττ, VH → jjb(bar b), t(bar t)H → t(bar t)b(bar b) have been added. Most previously used channels have been reanalyzed to gain sensitivity. We use the latest parton distribution functions and gg → H theoretical cross sections when comparing our limits to the SM predictions. With 2.0-3.6 fb-1 of data analyzed at CDF, and 0.9-4.2 fb-1 at D0, the 95% C.L. upper limits on Higgs boson production are a factor of 2.5 (0.86) times the SM cross section for a Higgs boson mass of mH = 115 (165) GeV/c2. Based on simulation, the corresponding median expected upper limits are 2.4 (1.1). The mass range excluded at 95% C.L. for a SM Higgs has been extended to 160 < mH < 170 GeV/c2