APFEL is an
opensource
Open source is source code that is made freely available for possible modification and redistribution. Products include permission to use the source code, design documents, or content of the product. The open-source model is a decentralized so ...
software able to perform
Dokshitzer–Gribov–Lipatov–Altarelli–Parisi (DGLAP) evolution up to next to next to leading order (NNLO) in
quantum chromodynamics (QCD) and to leading order (LO) in
quantum electrodynamics
In particle physics, quantum electrodynamics (QED) is the relativistic quantum field theory of electrodynamics. In essence, it describes how light and matter interact and is the first theory where full agreement between quantum mechanics and spec ...
(QED), both with pole and
minimal subtraction scheme
In quantum field theory, the minimal subtraction scheme, or MS scheme, is a particular renormalization scheme used to absorb the infinities that arise in perturbative calculations beyond leading order, introduced independently by Gerard 't Hooft a ...
(MSbar) masses. The coupled DGLAP QCD+QED evolution equations are solved in
x-space by means of
higher order interpolations and
Runge-Kutta techniques, and allow the exploration of different options for the treatment of
subleading terms.
Main features
See also
*
NNPDF
NNPDF is the acronym used to identify the parton distribution functions from the NNPDF Collaboration. NNPDF parton densities are
extracted from global fits to data based on a combination of a Monte Carlo method
Monte Carlo methods, or Monte C ...
References
{{Reflist
External links
APFEL website
Physics software