New features in version 2 of the fastNLO project

By D. Britzger, K. Rabbertz, F. Stober, M. Wobisch. 2012

142 citations recorded by the source corpus.

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.

Subfields: Nuclear and High Energy Physics

View Paper: https://www.semanticscholar.org/paper/523623c41cccd4884896ad76d26a675d4d07d8e2

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In Nuclear and High Energy Physics

1. Atlas Collaboration
2. Cms Collaboration
3. Juan Rojo
4. M. Schönherr
5. S. Höche
6. F. Krauss
7. F. Siegert
8. Jun Gao

Citations in the corpus

• Event generation with Sherpa 2.2 (2019, methodology): “e supported. They include Les Houches Event Files [38], N TUPLE les for NLO QCD events [39] and cross-section interpolation grids 3 produced via MC GRID [40, 41] in the A PPL G RID [42] and F AST NLO [43, 44] formats. To analyse events on-they a runtime interface to the R IVET package [45] can be us”
• Collider physics at the precision frontier (2020, background): “bosons, Higgs bosons and jets, where some of the results are publicly available in the form of grids, see e.g. [396]. Similarly, results for ttproduction at NNLO are available in the form of fastNLO [397, 398] tables [399]. Making calculations at high perturbative orders available in a fast and exib”
• The PDF4LHC report on PDFs and LHC data: Results from Run I and preparation for Run II (2015, methodology): “The latest version of the fastNLO convolution program [107] allows for the creation of tables in which renormalization and factorization scales can be varied as a function of two pre-defined observables.”
• Top-pair production at the LHC through NNLO QCD and NLO EW (2017, methodology): “on that this K-factor is PDF independent, such an analytic t could then be used to rescale the NNLO{QCD{accurate dierential distributions derived with any PDF set from existing NNLO QCD [51] fastNLO [52,53] tables. Regarding the PDF error of NNLO QCD dierential distributions, it can be calculated ve”
• Reweighting QCD matrix-element and parton-shower calculations (2016, methodology): “r the near future. The decomposition of the xed-order part of QCD calculations employed here is also a necessary ingredient to produce cross-section grids as provided by the APPLgrid [72] and FastNLO [73, 74] tools. These store the perturbative coecients for a certain observable calculation discreti”