The HOPPET NNLO parton evolution package

TL;DR

HOPPET is a Fortran 95 software package designed for efficient and accurate DGLAP evolution of parton distribution functions (PDFs) using a grid-based approach and polynomial basis functions.

Contribution

It introduces a grid-based method with polynomial basis functions for fast, accurate NNLO parton evolution, enhancing previous techniques.

Findings

High computational speed and accuracy achieved.

Flexible grid-based representation of PDFs.

Potential for future development and extensions.

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.