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Complete Nagy-Soper subtraction for next-to-leading order calculations in QCD

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Abstract

We extend the Helac-Dipoles package with the implementation of a new subtraction formalism, first introduced by Nagy and Soper in the formulation of an improved parton shower. We discuss a systematic, semi-numerical approach for the evaluation of the integrated subtraction terms for both massless and massive partons, which provides the missing ingredient for a complete implementation. In consequence, the new scheme can now be used as part of a complete NLO QCD calculation for processes with arbitrary parton masses and multiplicities. We assess its overall performance through a detailed comparison with results based on Catani-Seymour subtraction. The importance of random polarization and color sampling of the external partons is also examined.

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Authors and Affiliations

  1. Institut für Theoretische Teilchenphysik und Kosmologie, RWTH Aachen University, Otto-Blumenthal Str., D-52056, Aachen, Germany

    G. Bevilacqua, M. Czakon, M. Kubocz & M. Worek

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  1. G. Bevilacqua
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  2. M. Czakon
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  3. M. Kubocz
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Bevilacqua, G., Czakon, M., Kubocz, M. et al. Complete Nagy-Soper subtraction for next-to-leading order calculations in QCD. J. High Energ. Phys. 2013, 204 (2013). https://doi.org/10.1007/JHEP10(2013)204

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