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.
When OpenLoops 2 is used for a publication please cite:
F. Buccioni, J.-N. Lang, J.M. Lindert, P. Maierhöfer, S. Pozzorini, H. Zhang, M. Zoller
Eur.Phys.J. C79 (2019) no.10, 866
as well as the third party tools used for scalar integrals and reduction of loop-squared amplitudes.
F. Cascioli, P. Maierhöfer and S. Pozzorini,
Additionally depending on the application the following papers desrcibing the
underlying algorithms should be cited:
Phys. Rev. Lett. 108 (2012) 111601
F. Buccioni, S. Pozzorini, M. Zoller
Eur.Phys.J. C78 (2018) no.1, 70
S. Kallweit, J. M. Lindert, P. Maierhöfer and S. Pozzorini, M. Schönherr
JHEP 1504 (2015) 012