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APFELgrid: a high performance tool for parton density determinations
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abstract
We present a new software package designed to reduce the computational burden of hadron collider measurements in Parton Distribution Function (PDF) fits. The APFELgrid package converts interpolated weight tables provided by APPLgrid files into a more efficient format for PDF fitting by the combination with PDF and $\alpha_s$ evolution factors provided by APFEL. This combination significantly reduces the number of operations required to perform the calculation of hadronic observables in PDF fits and simplifies the structure of the calculation into a readily optimised scalar product. We demonstrate that our technique can lead to a substantial speed improvement when compared to existing methods without any reduction in numerical accuracy.
Forward citations
Cited by 2 Pith papers
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Fast interpolation grids for the Drell-Yan process
Differential NNLO Drell-Yan interpolation grids are released, with closure tests showing sub-per-mille accuracy and a validation that PDF fits are unaffected by the K-factor approximation.
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Recent QCD results from the xFitter project: Probing the strange content of the proton with charm production in charged current at LHeC
Projected LHeC charged-current charm data, generated as pseudodata, could reduce the strange PDF uncertainty, and this reduction is claimed to be nearly independent of the heavy-flavor scheme.
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