A Higher Order Perturbative Parton Evolution Toolkit (HOPPET). This document describes a Fortran 95 package for carrying out DGLAP evolution and other common manipulations of parton distribution functions (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, and Runge-Kutta techniques are used for the evolution in Q. Unpolarised evolution is provided to NNLO, including heavy-quark thresholds in the MSbar scheme, and longitudinally polarised evolution to NLO. The code is structured so as to provide simple access to the objects representing splitting functions and PDFs, making it possible for a user to extend the facilities already provided. A streamlined interface is also available, facilitating use of the evolution part of the code from F77 and C/C++.
Keywords for this software
References in zbMATH (referenced in 3 articles )
Showing results 1 to 3 of 3.
- Ball, Richard D.; Forte, Stefano; Guffanti, Alberto; Nocera, Emanuele R.; Ridolfi, Giovanni; Rojo, Juan: Unbiased determination of polarized parton distributions and their uncertainties (2013)
- Banfi, Andrea; Salam, Gavin P.; Zanderighi, Giulia: Phenomenology of event shapes at hadron colliders (2010)
- Gaunt, Jonathan R.; Stirling, W.James: Double parton distributions incorporating perturbative QCD evolution and momentum and quark number sum rules (2010)