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We investigate characteristics of the signal and backgrounds for Higgs bosondecay into WW at the Fermilab Tevatron and CERN Large Hadron Collider. In thethe lepton-pair-plus-missing-energy final state, we show that the backgroundreceives an important contribution from semileptonic decays of heavy flavors.Lepton isolation cuts provide too little suppression of these heavy flavorcontributions, and an additional 4 to 8 orders-of-magnitude suppression mustcome from physics cuts. We demonstrate that an increase of the minimumtransverse momentum of nonleading leptons in multilepton events is oneeffective way to achieve the needed suppression, without appreciable loss ofthe Higgs boson signal. Such a cut would impact the efficiency of searches forsupersymmetry as well. We emphasize the importance of direct measurement of thelepton background from heavy flavor production.Comment: 23 pgs., 10 figs, revtex4, 1 Ref. added, minor typos corrected, to  appear in Phys. Rev.

Missing heavy flavor backgrounds to Higgs boson production