HOPPET documentation
This is the documentation for HOPPET’s Python interface.
HOPPET is a Fortran package for carrying out DGLAP evolution and other common manipulations of parton distribution functions (PDFs). It also includes C++ and Python interfaces to many of the key features.
Within HOPPET, PDFs are represented on a grid in x-space so as to avoid limitations on the functional form of input distributions. Good speed and accuracy are obtained through the representation of splitting functions in terms of their convolution with a set of piecewise polynomial basis functions, and Runge-Kutta techniques are used for the evolution in Q.
Key features include:
unpolarized evolution in the MSbar scheme to N3LO including heavy-quark thresholds
QED evolution
massless structure function evaluation up to N3LO
polarized evolution up to NLO
simple access (in Fortran 90) to the objects representing splitting function and PDFs, making it possible for a user to extend the facilities already provided.
For more complete explanations of how HOPPET works, as well as its underlying Fortran interface, see the full manual in PDF format for details.