We analyze some signatures of neutral Higgs bosons, produced in high energy proton-(anti)proton collisions, which decay primarily to top quarks. This channel is clouded by a large irreducible tt̄ background. We investigate the tt̄ invariant-mass distribution in the lepton+jets decay mode of tt̄ and a tt̄ spin-spin correlation in the dilepton decay mode. At the CERN LHC such Higgs bosons can be detected in the tt̄ invariant-mass spectrum, and the spin-spin correlation studied by us is also sensitive to such a Higgs boson if this particle has a mass below 500 GeV.
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Bernreuther et al. (1998) studied this question.
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