文章基本信息

标题：Multiparton NLO corrections by numerical methods
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作者：S. Becker ; D. Goetz ; C. Reuschle 等
期刊名称：PoS - Proceedings of Science
印刷版ISSN：1824-8039
出版年度：2011
卷号：2011
期号：RADCOR2011
出版社：SISSA, Scuola Internazionale Superiore di Studi Avanzati
摘要：In this talk we discuss an algorithm for the numerical calculation of one-loop QCD amplitudes and present results at next-to-leading order for jet observables in electron-positron annihilation calculated with the above-mentioned method. The algorithm consists of subtraction terms, approximating the soft, collinear and ultraviolet divergences of QCD one-loop amplitudes, as well as a method to deform the integration contour for the loop integration into the complex plane to match Feynman’s id rule. The algorithm is formulated at the amplitude level and does not rely on Feynman graphs. Therefore all ingredients of the algorithm can be calculated efficiently using recurrence relations. The application of this method to the leading-colour contribution of e+e− →n jets, with n up to seven, demonstrates the efficiency of the approach.