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Published on: November 15, 2013
Higher-Order QCD Corrections to Top-Quark Pair Production in Association with a Jet
Simon Badger1, Colomba Brancaccio1, Matteo Becchetti2
1Sezione di Torino, Università di Torino, Arnold-Regge Center, Dipartimento di Fisica and , and INFN, Via P. Giuria 1, I-10125 Torino, Italy.
Abstract:
The production of a top-quark pair, the heaviest known elementary particle, in association with a light jet is a key process for studying the properties of the standard model of particle physics. Due to its significance as a signal process with considerable sensitivity to the top-quark mass and as a background process for new physics searches, it is crucial to predict differential cross sections with high precision. In this Letter, we present, for the first time, predictions for various kinematical observables at next-to-next-to-leading order in quantum chromodynamics. The perturbative behavior is analyzed, and uncertainties arising from missing higher-order contributions are substantially reduced. The necessary two-loop amplitudes have been evaluated in the leading-color approximation, and we provide estimates for the impact of the missing contributions.
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