Programs in Physics & Physical Chemistry
|[Licence| Download | New Version Template] aehv_v1_0.tar.gz(890 Kbytes)|
|Manuscript Title: QCDNUM: Fast QCD Evolution and Convolution - QCDNUM Version 17.00|
|Authors: M. Botje|
|Program title: QCDNUM version: 17.00|
|Catalogue identifier: AEHV_v1_0|
Distribution format: tar.gz
|Journal reference: Comput. Phys. Commun. 182(2011)490|
|Programming language: Fortran-77.|
|Operating system: All.|
|RAM: Typically 3 Mbytes|
|Keywords: QCD evolution, DGLAP evolution equations, Parton densities, Fragmentation functions, Structure functions.|
Nature of problem:
Evolution of the strong coupling constant and parton densities, up to next-to-next-to-leading order in perturbative QCD. Computation of observable quantities by Mellin convolution of the evolved densities with partonic cross-sections.
Parameterisation of the parton densities as linear or quadratic splines on a discrete grid, and evolution of the spline coefficients by solving (coupled) triangular matrix equations with a forward substitution algorithm. Fast computation of convolution integrals as weighted sums of spline coefficients, with weights derived from user-given convolution kernels.
Accuracy and speed are determined by the density of the evolution grid.
Less than 10 ms on a 2 GHz Intel Core 2 Duo processor to evolve the gluon density and 12 quark densities at next-to-next-to-leading order over a large kinematic range.
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