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New features in version 2 of the fastNLO project

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arxiv 1208.3641 v1 pith:VNEXSA2I submitted 2012-08-17 hep-ph

New features in version 2 of the fastNLO project

Daniel Britzger , Klaus Rabbertz , Fred Stober , Markus Wobisch (fastNLO Collaboration) This is my paper
classification hep-ph
keywords fastnlocoefficientsdistributionfunctionsinterpolationobservablepartonperturbative
verification ladder T0 review T1 audit T2 compute T3 formal T4 reserved
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Standard methods for higher-order calculations of QCD cross sections in hadron-induced collisions are time-consuming. The fastNLO project uses multi-dimensional interpolation techniques to convert the convolutions of perturbative coefficients with parton distribution functions and the strong coupling into simple products. By integrating the perturbative coefficients for a given observable with interpolation kernels, fastNLO can store the results of the time-consuming folding integrals in tables, which subsequently are used for very fast rederivations of the same observable for arbitrary parton distribution functions, different scale choices, or alpha_s(M_Z). Various tables with code for their evaluation are available for numerous jet measurements at the LHC, the TeVatron, and HERA. FastNLO is used in publications of experimental results by the ATLAS, CMS, CDF, D0, and H1 collaborations, and in all recent global PDF analyses by MSTW, CTEQ, and NNPDF. This article focuses on developments implemented in the new version 2 of fastNLO, enhancing and broadening its functionality.

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