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Towards W \( b\overline b \) + j at NLO with an automatized approach to one-loop computations

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Abstract

We present results for the O(αs) virtual corrections to qg → W \( b\overline b {q^{\prime }} \) obtained with a new automatized approach to the evaluation of one-loop amplitudes in terms of Feynman diagrams. Together with the O(αs) corrections to \( q{\overline q^{\prime }} \) → W \( b\overline b g \), which can be obtained from our results by crossing symmetry, this represents the bulk of the next-to-leading order virtual QCD corrections to W \( b\overline b \) + j and W b + j hadronic production, calculated in a fixed-flavor scheme with four light flavors. Furthermore, these corrections represent a well defined and independent subset of the 1-loop amplitudes needed for the NNLO calculation of W \( b\overline b \). Our approach was tested against several existing results for NLO amplitudes including selected O(αs) one-loop corrections to W + 3 j hadronic production. We discuss the efficiency of our method both with respect to evaluation time and numerical stability.

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  1. Physics Department, Florida State University, Tallahassee, FL, 32306-4350, U.S.A

    Laura Reina & Thomas Schutzmeier

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  1. Laura Reina
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ArXiv ePrint: 1110.4438

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Reina, L., Schutzmeier, T. Towards W \( b\overline b \) + j at NLO with an automatized approach to one-loop computations. J. High Energ. Phys. 2012, 119 (2012). https://doi.org/10.1007/JHEP09(2012)119

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