The LoopTools Visitor Center

LoopTools is a package for evaluation of scalar and tensor one-loop integrals based on the FF package by G.J. van Oldenborgh. It features an easy Fortran, C++, and Mathematica interface to the scalar one-loop functions of FF and in addition provides the 2-, 3-, and 4-point tensor coefficient functions.

LoopTools has been published in Comput. Phys. Commun. 118 (1999) 153 [hep-ph/9807565].
FF has been published in Z. Phys. C46 (1990) 425 [scanned version from KEK].

The installation script gets you started quickly and easily.

The following files can be downloaded:

To compile the libraries you need f77 and gcc.
From Mathematica 7 on you must also have g++ (and libstdc++) installed for the MathLink compile.

Installation notes for the impatient:

More detailed instructions are given in the manual contained in the LoopTools distribution.
You can obtain the manual of the current version here.

Ready-made MathLink executables (Version 2.15, statically linked as far as possible):

Linux x86_64:

macOS x86_64:

macOS ARM64:

Cygwin/Windows x86_64:

Instructions: download and gunzip the executable, then make it executable with "chmod 755 file".

Thanks for looking in.

Please send bug reports, suggestions, fan mail, etc. to Thomas Hahn,

Related packages: FF, FeynArts, FormCalc, FeynCalc, QCDloop.

This site and the programs offered here are not commercial. LoopTools is and will stay an open-source package and free of charge. If you want to use LoopTools in a commercial application, make sure you understand the GNU Lesser General Public License under which LoopTools is distributed. LoopTools is being developed at the Max Planck Institute for Physics in Munich.

Data protection statement and Imprint

Last update: 1 Jul 24 Thomas Hahn