openloops is hosted by Hepforge, IPPP Durham

Third party Tools

OpenLoops makes use of the following third-party tools which are shipped and compiled together with OpenLoops.


By default the COLLIER library by A. Denner, S. Dittmaier and L. Hofer is linked for the fast and numerically stable evaluation of one-loop tensor and scalar integrals. If used please cite

A. Denner, S. Dittmaier, L. Hofer
Comput.Phys.Commun. 212 (2017) 220-238


OpenLoops also uses OPP reduction methods implemented in CutTools by G. Ossola, C. G. Papadopoulos and R. Pittau. If used please cite

G. Ossola, C. Papadopoulos, R. Pittau
JHEP 0803 (2008) 042


The OneLOop library by A. van Hameren is used for the evaluation of one-loop scalar integrals. If used please cite

A. van Hameren
Comput. Phys. Commun. 182 (2011) 2427-2438