We develop and prove the theory of the QCD extension of the YFS Monte Carlo approach to higher order QED radiative corrections.As a corollary, a new approach to quantum gravity by one of us (B.F.L.W.) is illustrated.Semi-analytical results and preliminary explicit Monte Carlo data are presented for the processes pp → tt + X at FNAL energies.We comment briefly on the implications of our results on the CDF/D0 observations and on RHIC/LHC physics.
KKMChh adapts the CEEX (Coherent Exclusive Exponentiation) formalism of the Monte CarloProgram KKMC for Z boson production and decay to hadron scattering. Amplitude-level soft photon exponentiation of initial and final state radiation, together with initial-final interference, is matched to a perturbative calculation to second order next-to-leading logarithm, and electroweak corrections to the hard process are included via DIZET. The first release of KKMChh included complete initial state radiation calculated with current quark masses. This version assumes idealized pure-QCD PDFs with negligible QED contamination. Traditional PDFs neglect QED evolution but are not necessarily free of QED influence in the data. QED-corrected PDFs provide a firmer starting point for precision QED work. We describe a new procedure for matching KKMChh's initial state radiation to a QED-corrected PDF, and compare this to earlier approaches.
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