Chromopolis
A complete framework for the pQCD analysis of the structure of the nucleon

Welcome to the web page of Chromopolis, a computer program for the analysis of the spin-averaged and spin-dependent structure of the nucleon in perturbative quantum chromodynamics (pQCD). The core of Chromopolis consist of an extended and extensible database with world data on polarized and unpolarized high-energy scattering, and the implementation of calculations for the relevant observables; including renormalization-group evolution codes for the strong coupling and the parton distribution functions up to NNLO of QCD. A characteristic of these codes is that they work to a large extent in the space of complex moments known as Mellin space. Chromopolis also contains code for the statistical analysis of the data, including optimization algorithms with different treatments of correlated and uncorrelated uncertainties, and an implementation of the Hessian approach for the propagation of experimental uncertainties. In addition it provides facilities for the graphical representation of the results.

Chromopolis has been written in Fortran 95 and uses the PDF terminal of Gnuplot for producing plots. It is authored by Pedro Jimenez-Delgado and is free software released under the GNU General Public License. Please have a look at the manual or download the latest version, Chromopolis 1.0.

For your enjoyment, below are some random plots of results obtained with Chromopolis.