pylooptools

pylooptools is a python bindings package for the LoopTools package http://www.feynarts.de/looptools/.

Note that this is NOT an official LoopTools release and I refer to http://www.feynarts.de/looptools/ for the official version.

Installation

We provide a python setup.py script that

• fetches LoopTools from http://www.feynarts.de/looptools/ (using urllib)
• compiles the library with suitable flags and applies necessary patches to produce a shared library
• install the python modules giving access to the LoopTools functions via Python ctypes returning numpy objects. The installation can be done in the commandline using

python setup.py install

Usage

The python package has to be in the PYTHONPATH. A simple example python script using the library is given by

#!/usr/bin/python
from pylooptools.ltools import *
# Initialize the LoopTools library

init_ltools()

print A0(.12)

Output of the above script is

 ====================================================
   FF 2.0, a package to evaluate one-loop integrals
 written by G. J. van Oldenborgh, NIKHEF-H, Amsterdam
 ====================================================
 for the algorithms used see preprint NIKHEF-H 89/17,
 'New Algorithms for One-loop Integrals', by G.J. van
 Oldenborgh and J.A.M. Vermaseren, published in
 Zeitschrift fuer Physik C46(1990)425.
 ====================================================
\mu is 1.000000
\Delta is -1.000000
(0.254431624344+0j)