pp(macro)-->tt(macro)H: a discovery mode for the Higgs boson at the Fermilab Tevatron

Increased yield of ttbb at Hadron Colliders in low-energy supersymmetry

Light bottom squarks and gluinos have been invoked to explain the b quark pair production excess at the Fermilab Tevatron. We investigate the associated production of ttbb at hadron colliders in this scenario, and find that the rates for this process are enhanced over the standard model prediction. If light gluinos exist, it may be possible to detect them at the Tevatron, and they could easily be observed at the CERN Large Hadron Collider.

Higgs radiation off top quarks at the Tevatron and the LHC

Higgs bosons can be searched for in the channels pp macro/pp-->tt macro H + X at the Fermilab Tevatron and the Cern Large Hadron Collider (LHC). We have calculated the QCD corrections to these processes in the standard model at next-to-leading order. The higher-order corrections reduce the renormalization and factorization scale dependence considerably and stabilize the theoretical predictions for the cross sections. At the central scale mu = (2m(t)+M(H))/2 the properly defined K factors are slightly below unity for the Tevatron (K approximately 0.8) and slightly above unity for the LHC (K approximately 1.2).

Next-to-leading order results for tt macro h production at the Tevatron

We compute the Omicron(alpha(3)(s)) inclusive total cross section for the process pp macr0 -->tt macro h in the standard model, at the square root of s(H) = 2 TeV. The next-to-leading order corrections drastically reduce the renormalization and factorization scale dependence of the Born cross section and slightly decrease the total cross section for renormalization and factorization scales between m(t) and 2m(t).