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. Cascioli, P. Maierhöfer and S. Pozzorini,
Phys. Rev. Lett. 108 (2012) 111601
F. Buccioni, S. Pozzorini, M. Zoller
Eur.Phys.J. C78 (2018) no.1, 70
as well as the third party tools used for scalar integrals and reduction of loop-squared amplitudes.
S. Kallweit, J. M. Lindert, P. Maierhöfer and S. Pozzorini, M. Schönherr
When using NLO EW functionality please cite:
JHEP 1504 (2015) 012
A dedicated OpenLoops 2 publication will be released soon.