APFELgrid : A high performance tool for parton density determinations

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• 作者：Valerio Bertone^a ; Stefano Carrazza^b ; Nathan P. Hartland^a ; ^{nathan.hartland@physics.ox.ac.uk}
• 关键词：QCD ; Parton distribution functions ; Fast predictions
• 刊名：Computer Physics Communications
• 出版年：2017
• 出版时间：March 2017
• 年：2017
• 卷：212
• 期：Complete
• 页码：205-209
• 全文大小：730 K
• 卷排序：212

文摘

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 αsαs 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.Program SummaryProgram Title:APFELgridProgram Files doi:http://dx.doi.org/10.17632/mhwjt5nsg7.1Licensing provisions: MIT licenseProgramming language: C++Nature of problem: Fast computation of hadronic observables under the variation of parton distribution functions.Solution method: Combination of interpolated weight grids from APPLgrid files and evolution factors from APFEL into efficient FastKernel tables.External routines/libraries:APPLgrid, APFEL