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

Rikkert Frederix; Stefano Frixione; Fabio Maltoni; Tim Stelzer

doi:10.1088/1126-6708/2009/10/003

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

Rikkert Frederix, Stefano Frixione, Fabio Maltoni, Tim Stelzer

Research output: Contribution to journal › Article › peer-review

Abstract

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.

Original language	English
Article number	003
Number of pages	58
Journal	Journal of High Energy Physics
Volume	2009
Issue number	10
DOIs	https://doi.org/10.1088/1126-6708/2009/10/003
Publication status	Published - 2009 Oct
Externally published	Yes

Subject classification (UKÄ)

Subatomic Physics

Free keywords

Beyond standard model
Heavy quark physics
NLO computations
QCD

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10.1088/1126-6708/2009/10/003

Cite this

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abstract = " 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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AU - Stelzer, Tim

PY - 2009/10

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

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Subject classification (UKÄ)

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