ePDF is a library that implements the evolution in pure QED of the unpolarised electron parton distribution functions (PDFs) up to next-to-leading logarithmic (NLL) approximation. The initial conditions, computed here, can be evolved either numerically, by solving the DGLAP equation through different numerical algorithms, or analytically. The analytical solutions are obtained by means of an additive formula that matches a large-*z* solution, that includes all orders in the QED coupling constant, with a small- and intermediate-*z* solution that includes terms up to third order in the coupling constant.

Download

You can obtain ePDF directly from the github repository:

https://github.com/gstagnit/ePDF/releases

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

git clone https://github.com/gstagnit/ePDF.git

Dependencies

In order to install the code, you need to have installed:

yaml-cpp,
GSL.

Installation

The code can be compiled using the following procedure:

cd ePDF
cmake -DCMAKE_INSTALL_PREFIX=/your/installation/path/ .
make && make install

By the default, if no prefix specification is given, the program will be installed in the /usr/local folder. If you want (or need) to use a different path, remember to export the ePDF /lib folder into the LD_LIBRARY_PATH. More configuration options can be accessed through:

ccmake .

Documetation

Code documentation generated with Doxygen can be found here: https://vbertone.github.io/ePDF/html/index.html.

Relevant references

S. Frixione, Initial conditions for electron and photon structure and fragmentation functions, arXiv:1909.03886.

Contacts

Valerio Bertone: valer.nosp@m.io.b.nosp@m.erton.nosp@m.e@ce.nosp@m.rn.ch
Matteo Cacciari: matte.nosp@m.o.ca.nosp@m.cciar.nosp@m.i@ce.nosp@m.rn.ch
Stefano Frixione: stefa.nosp@m.no.f.nosp@m.rixio.nosp@m.ne@c.nosp@m.ern.c.nosp@m.h
Giovanni Stagnitto: giova.nosp@m.nni..nosp@m.stagn.nosp@m.itto.nosp@m.@gmai.nosp@m.l.co.nosp@m.m