openloops is hosted by Hepforge, IPPP Durham

 

OpenLoops 2.0

 

About The OpenLoops 2 program is a fully automated implementation of the Open Loops algorithm combined with on-the-fly reduction methods, which allows for the fast and stable numerical evaluation of tree and one-loop matrix elements for any Standard Model process at NLO QCD and NLO EW.

On this website you find the latest version of OpenLoops with installation instructions and a documentation of the most important features, input parameters, and available Fortran90 and C/C++ interfaces.

This webpage is still under construction and will be updated regularly. A reference manual will become available soon.

Cite When OpenLoops 2 is used for a publication please cite:

F. Cascioli, P. Maierhöfer and S. Pozzorini,
Phys. Rev. Lett. 108 (2012) 111601
arXiv:1111.5206

F. Buccioni, S. Pozzorini, M. Zoller
Eur.Phys.J. C78 (2018) no.1, 70
arXiv:1710.11452

as well as the third party tools used for scalar integrals and reduction of loop-squared amplitudes.
When using NLO EW functionality please cite:

S. Kallweit, J. M. Lindert, P. Maierhöfer and S. Pozzorini, M. Schönherr
JHEP 1504 (2015) 012
arXiv:1412.5157

A dedicated OpenLoops 2 publication will be released soon.

Authors
Contact please send comments and bug reports to openloops@projects.hepforge.org and subscribe to our mailing list to keep updated.