Signatures of Higgs bosons in the top quark decay channel at hadron colliders

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 $t\overline{t}$ background. We investigate the $t\overline{t}$ invariant-mass distribution in the $\mathrm{l}\mathrm{e}\mathrm{p}\mathrm{t}\mathrm{o}\mathrm{n}+\mathrm{j}\mathrm{e}\mathrm{t}\mathrm{s}$ decay mode of $t\overline{t}$ and a $t\overline{t}$ spin-spin correlation in the dilepton decay mode. At the CERN LHC such Higgs bosons can be detected in the $t\overline{t}$ 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.