New CT18 PDFs at NLO and NNLO from global fit to HERA plus LHC jet, Drell-Yan, top-pair and Z data, with Hessian errors, Lagrange-multiplier studies, and alternate sets for data tensions and scale choices.
aMCfast: automation of fast NLO computations for PDF fits
2 Pith papers cite this work. Polarity classification is still indexing.
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abstract
We present the interface between MadGraph5_aMC@NLO, a self-contained program that calculates cross sections up to next-to-leading order accuracy in an automated manner, and APPLgrid, a code that parametrises such cross sections in the form of look-up tables which can be used for the fast computations needed in the context of PDF fits. The main characteristic of this interface, which we dub aMCfast, is its being fully automated as well, which removes the need to extract manually the process-specific information for additional physics processes, as is the case with other matrix element calculators, and renders it straightforward to include any new process in the PDF fits. We demonstrate this by studying several cases which are easily measured at the LHC, have a good constraining power on PDFs, and some of which were previously unavailable in the form of a fast interface.
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Inclusion of forward-backward asymmetry from LHC neutral current Drell-Yan data provides additional sensitivity to parton distribution functions at current and future luminosities in xFitter fits.
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New CTEQ global analysis of quantum chromodynamics with high-precision data from the LHC
New CT18 PDFs at NLO and NNLO from global fit to HERA plus LHC jet, Drell-Yan, top-pair and Z data, with Hessian errors, Lagrange-multiplier studies, and alternate sets for data tensions and scale choices.
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Using Forward-Backward Drell-Yan Asymmetry in PDF Determinations
Inclusion of forward-backward asymmetry from LHC neutral current Drell-Yan data provides additional sensitivity to parton distribution functions at current and future luminosities in xFitter fits.