7 A. Effect of additional search cuts • One of the leptons from the W decays (the “trigger” lepton, ℓ$_{1}$ ) is required to be relatively hard and central, p ℓ 1 t > 20 GeV, | η ℓ 1 | < 0 . 8 whilst the other ( ℓ$_{2}$ ) may be either softer or produced at slightly higher pseudorapidity, p ℓ 2 t > 10 GeV, | η ℓ 2 | < 1 . 1. • The invariant mass of the lepton pair is bounded from below (to eliminate virtual photon contributions), m$_{ℓ}$ 1 ℓ 2 > 16 GeV. We also investigate the behaviour of the LO and NLO predictions in the kinematic region relevant for the latest Tevatron Higgs exclusion limits. Therefore, in addition to the jet cuts above, we also consider cuts on the decay products of the W/W ⋆ that are produced by the Higgs boson. These cuts correspond very closely to a recent CDF analysis [34], although the treatment of lepton acceptance is simplified. The correspondence of our results with those of Anastasiou et al. is somewhat obscured by the fact that the total Higgs width used in Ref. [29] is about 7% smaller at m$_{H}$ = 160 GeV than the value given in our Table II. Taking this fact into account and including the finite top mass correction tabulated in Table II we find that our NLO Higgs + 1 jet and LO Higgs + 2 jet cross sections in Table I are in agreement with the corresponding numbers (1 . 280 and 0 . 336 fb) from Table 2 of Ref. [29]. R (computed using Eq. (4)) using a value for the top quark mass of m$_{t}$ = 172 . 5 ± 2 . 5 GeV. In the spirit of Ref. [29], we can now estimate the theoretical uncertainty on the number of Higgs signal events originating from gluon fusion. By using the fractions of the Higgs cross section in the different multiplicity bins taken from Ref. [33], we can update Eq. (4.3) of Ref. [29] (for a Higgs boson of mass 160 GeV) with, Only the uncertainty on the Higgs + ≥ 2 jet bin has been modified, using the results from Table II. The corresponding determination using the LO uncertainty in the Higgs + ≥ 2 jet bin is (+20 , 0% , − 16 . 9%) [29], so this represents a modest improvement in the overall theoretical error. Δ N$_{signal}$ (scale) N$_{signal}$ = 60% · ( +5% − 9% ) + 29% · ( +24% − 23% ) + 11% · ( +35% − 31% ) = ( +13 . 8% − 15 . 5% ) (12)