Physics – High Energy Physics – High Energy Physics - Phenomenology
Scientific paper
2009-08-28
JHEP 0910:003,2009
Physics
High Energy Physics
High Energy Physics - Phenomenology
61 pages, 3 figures. Updated a reference
Scientific paper
10.1088/1126-6708/2009/10/003
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.
Frederix Rikkert
Frixione Stefano
Maltoni Fabio
Stelzer Tim
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