Physics – High Energy Physics – High Energy Physics - Phenomenology
Scientific paper
2010-05-10
Comput.Phys.Commun.182:490-532,2011
Physics
High Energy Physics
High Energy Physics - Phenomenology
74 pages, 6 figures. Minor modifications in the text and updated list of references
Scientific paper
10.1016/j.cpc.2010.10.020
The QCDNUM program numerically solves the evolution equations for parton densities and fragmentation functions in perturbative QCD. Un-polarised parton densities can be evolved up to next-to-next-to-leading order in powers of the strong coupling constant, while polarised densities or fragmentation functions can be evolved up to next-to-leading order. Other types of evolution can be accessed by feeding alternative sets of evolution kernels into the program. A versatile convolution engine provides tools to compute parton luminosities, cross-sections in hadron-hadron scattering, and deep inelastic structure functions in the zero-mass scheme or in generalised mass schemes. Input to these calculations are either the QCDNUM evolved densities, or those read in from an external parton density repository. Included in the software distribution are packages to calculate zero-mass structure functions in un-polarised deep inelastic scattering, and heavy flavour contributions to these structure functions in the fixed flavour number scheme.
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