The HOPPET NNLO parton evolution package

Abstract

This contribution describes the HOPPET Fortran~95 package for carrying out DGLAP evolution and other common manipulations of PDFs. The 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. We briefly describe the structure of the code and discuss its quantitative performance. Finally we comment of future directions for the program's development.

Comments: 4 pages, 2 figures, to appear in the proceedings of the DIS 2008 Workshop, 7-11 April 2008, University College London,