Automation of next-to-leading order computations in QCD: the FKS subtraction

被引：204

作者：

Frederix, Rikkert ^{[1
]}

Frixione, Stefano ^{[1
,2
]}

Maltoni, Fabio ^{[3
]}

Stelzer, Tim ^{[4
]}

机构：

[1] CERN, TH Unit, PH Dept, CH-1211 Geneva 23, Switzerland

[2] Ecole Polytech Fed Lausanne, ITPP, CH-1015 Lausanne, Switzerland

[3] Catholic Univ Louvain, Ctr Particle Phys & Phenomenol CP3, B-1348 Louvain La Neuve, Belgium

[4] Univ Illinois, Dept Phys, Urbana, IL 61801 USA

来源：

JOURNAL OF HIGH ENERGY PHYSICS | 2009年 / 10期

基金：

美国国家科学基金会;

关键词：

NLO Computations; QCD; Beyond Standard Model; Heavy Quark Physics; JET CROSS-SECTIONS; AMPLITUDES; ALGORITHMS;

D O I：

10.1088/1126-6708/2009/10/003

中图分类号：

O412 [相对论、场论]; O572.2 [粒子物理学];

学科分类号：

摘要：

We present the complete automation of the universal subtraction formalism proposed by Frixione, Kunszt, and Signer for the computation of any cross section at the next-to-leading order in QCD. Given a process, the only ingredient to be provided externally is the infrared-and ultraviolet-finite contribution of virtual origin. Our implementation, currently restricted to the case of e(+)e(-) collisions, is built upon and works in the same way as MadGraph. It is particularly suited to parallel computation, and it can deal with any physical process resulting from a theory implemented in MadGraph, thus including the Standard Model as well as Beyond the Standard Model theories. We give results for some sample processes that document the performances of the implementation, and show in particular how the number of subtraction terms has an extremely mild growth with final-state multiplicity.

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页数：57

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