APFEL: A PDF Evolution Library

Visit: http://apfel.hepforge.org and http://apfel.mi.infn.it/

APFEL is a library able to perform DGLAP evolution up to NNLO in QCD and to NLO in QED, both with pole and MSbar masses. The coupled DGLAP QCD+QED evolution equations are solved in x-space by means of higher order interpolations and Runge-Kutta techniques.

The APFEL library is accessible also through the APFEL Web interface. APFEL Web provides an online web-application which integrates several HEP softwares providing a complete suite plotting tools for PDFs and many related quantities (http://apfel.mi.infn.it/).

Download

You can obtain APFEL directly from the GitHub repository:

https://github.com/scarrazza/apfel/releases

For the last development version you can clone the master code:

git clone https://github.com/scarrazza/apfel.git

For the latest tag:

git tag -l
git checkout tags/tag_name

Installation

Checkout the code and compile the code using the following procedure:

cd apfel
./configure --prefix=/where/install/apfel #(optional)
make && make install

By the default, if prefix is not set, the program is installed in /usr/local. If you define a different prefix, remember to export it into the LD_LIBRARY_PATH.

Known issues

If you observe memory issues while running APFEL on specific machines you can move the memory allocation to heap by adding the -fno-automatic flag:

export FFLAGS=$(echo $FFLAGS | sed 's/-fopenmp/-fno-automatic/g')
./configure --prefix=$PREFIX 

References

• V. Bertone, S. Carrazza, J. Rojo, APFEL: A PDF Evolution Library with QED corrections, arXiv:1310.1394.
• S. Carrazza, A. Ferrara, D. Palazzo, J. Rojo, APFEL Web: a web-based application for the graphical visualization of parton distribution functions, arXiv:1410.5456.

Contact Information

Maintainers: Valerio Bertone, Stefano Carrazza

Homepage: http://apfel.hepforge.org/