Complete Nagy-Soper subtraction for next-to-leading order calculations in QCD
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.
Keywords
Cite
@article{arxiv.1308.5605,
title = {Complete Nagy-Soper subtraction for next-to-leading order calculations in QCD},
author = {G. Bevilacqua and M. Czakon and M. Kubocz and M. Worek},
journal= {arXiv preprint arXiv:1308.5605},
year = {2013}
}
Comments
37 pages, 8 tables, 3 figures. References added, version to appear in JHEP