Two-Loop Four-Gluon Amplitudes from Numerical Unitarity

We present the first numerical computation of two-loop amplitudes based on the unitarity method. As a proof of principle, we compute the four-gluon process in the leading-color approximation. We discuss the new method, analyze its numerical properties, and apply it to reconstruct the analytic form o...

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Bibliographic Details
Published in:Physical review letters 2017-10, Vol.119 (14), p.142001-142001, Article 142001
Main Authors: Abreu, S, Cordero, F Febres, Ita, H, Jaquier, M, Page, B, Zeng, M
Format: Article
Language:English
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Summary:We present the first numerical computation of two-loop amplitudes based on the unitarity method. As a proof of principle, we compute the four-gluon process in the leading-color approximation. We discuss the new method, analyze its numerical properties, and apply it to reconstruct the analytic form of the amplitudes. The numerical method is universal, and can be automated to provide multiscale two-loop computations for phenomenologically relevant signatures at hadron colliders.
ISSN:0031-9007
1079-7114
DOI:10.1103/PhysRevLett.119.142001