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We present predictions for the production cross section of t-quark pair production in association with a Z-boson at the next-to-leading order accuracy using matrix elements obtained from the HELAC-Oneloop package. We use the subtraction method for computing the radiative corrections as implemented in the POWHEG-Box, which was also used in several other computations of similar complexity.
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Kardos et al. (2012) studied this question.
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