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NNLO QCD subtraction for top-antitop production in the qq ̄ channel


Abelof, Gabriel; Ridder, Aude Gehrmann-De; Maierhöfer, Philipp; Pozzorini, Stefano (2014). NNLO QCD subtraction for top-antitop production in the qq ̄ channel. Journal of High Energy Physics, 2014(8):1-55.

Abstract

We present the computation of the double real and real-virtual contributions to top-antitop pair production in the quark-antiquark channel at leading colour. The → amplitudes contributing to the real-virtual part are computed with O penL oops, and their numerical stability in the soft and collinear regions is found to be sufficiently high to perform a realistic NNLO calculation in double precision. The subtraction terms required at real-real and real-virtual levels are constructed within the antenna subtraction formalism extended to deal with the presence of coloured massive final state particles. We show that those subtraction terms approximate the real-real and real-virtual matrix elements in all their singular limits.

Abstract

We present the computation of the double real and real-virtual contributions to top-antitop pair production in the quark-antiquark channel at leading colour. The → amplitudes contributing to the real-virtual part are computed with O penL oops, and their numerical stability in the soft and collinear regions is found to be sufficiently high to perform a realistic NNLO calculation in double precision. The subtraction terms required at real-real and real-virtual levels are constructed within the antenna subtraction formalism extended to deal with the presence of coloured massive final state particles. We show that those subtraction terms approximate the real-real and real-virtual matrix elements in all their singular limits.

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Additional indexing

Item Type:Journal Article, refereed, original work
Communities & Collections:07 Faculty of Science > Physics Institute
Dewey Decimal Classification:530 Physics
Date:2014
Deposited On:17 Feb 2015 13:55
Last Modified:05 Apr 2016 18:59
Publisher:Springer
ISSN:1029-8479
Publisher DOI:https://doi.org/10.1007/JHEP08(2014)035

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