We investigate the possibilities of searching for nonstandard CP violation in pp→tt̄X at multiple TeV collision energies. A general kinematic analysis of the underlying partonic production processes gg→tt̄ and qq̄→tt̄ in terms of their density matrices is given. We evaluate the CP-violating parts of these matrices in two-Higgs-doublet extensions of the standard model (SM) and give results for CP asymmetries at the parton level. We show that these asymmetries can be traced by measuring suitable observables constructed from energies and momenta of the decay products of t and t̄. We find CP-violating effects to be of the order of 10^-3 and show that possible contaminations induced by SM interactions are safely below the expected signals.
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Bernreuther et al. (1994) studied this question.
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