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License: GNU General Public License v3.0
GitHub mirror of http://openloops.hepforge.org/ as used by CMS.
License: GNU General Public License v3.0
========= OpenLoops ========= Copyright 2014 Fabio Cascioli, Jonas Lindert, Philipp Maierhoefer, Stefano Pozzorini Authors Fabio Cascioli, [email protected] Jonas Lindert, [email protected] Philipp Maierhoefer, [email protected] Stefano Pozzorini, [email protected] Contact [email protected] If you would like to receive notifications about OpenLoops updates and news per e-mail, please sign up to our mailing list at https://www.hepforge.org/lists/listinfo/openloops-announce OpenLoops is a Fortran 90 package for the calculation of tree and one-loop matrix elements for Standard Model processes based on F. Cascioli, P. Maierhoefer and S. Pozzorini, Phys. Rev. Lett. 108 (2012) 111601, arXiv:1111.5206 License OpenLoops is free software: you can redistribute it and/or modify it under the terms of the GNU General Public License as published by the Free Software Foundation, either version 3 of the License, or (at your option) any later version. OpenLoops is distributed in the hope that it will be useful, but WITHOUT ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License for more details. You should have received a copy of the GNU General Public License along with OpenLoops. If not, see <http://www.gnu.org/licenses/>. ============ Installation ============ Requirements gfortran 4.6 or later, or ifort Python 2.x starting with 2.4 Apache Subversion (optional, to install from SVN) You can either download OpenLoops from SVN (recommended) svn checkout http://openloops.hepforge.org/svn/OpenLoops/branches/public OpenLoops or from the OpenLoops web page http://www.hepforge.org/downloads Compile cd OpenLoops ./scons Download and compile process libraries ./openloops libinstall <processes> where <processes> is a white space separated list of the processes or process collections (with suffix ".coll") which should be installed. Some process collections are defined in the process repository (in particular "all.coll" to install all processes from the repository). User-defined collections can be set up as plain text files with file extension ".coll" with line break separated names of process libraries. A list of the available process libraries can be found here http://openloops.hepforge.org/processes Process libraries usually include all real correction processes required for an NLO calculation. However these processes are not compiled by default. Note that Sherpa uses its own matrix elements for real corrections, thus compiling OpenLoops real corrections is not required for usage with Sherpa. In order to activate the compilation of real corrections, create a file named "openloops.cfg" in your installation directory which contains the following (besides other options which you might have set): [OpenLoops] compile_extra = 1 The set of available processes will be extended continuously. If you need a process which is not (yet) available, please contact the OpenLoops authors. ====================================== Update OpenLoops and process libraries ====================================== Note that automatic updates of the process independent OpenLoops code are only supported when OpenLoops was installed from SVN. To update from SVN and update all installed processes ./openloops update To only update installed processes, but not OpenLoops itself (this also works when OpenLoops was not installed from SVN) ./openloops update --processes Updating individual process libraries works the same way as installing new processes. ./openloops libinstall <processes> If process collections are used, new processes in the collection will be installed and previously installed processes will be updated if newer versions are available. E.g. ./openloops libinstall all.coll Updating/installing processes also creates/updates a local database of all processes which are available for download. This database is used at runtime to report if a requested process is available for download, if it is not yet installed. ===================== Support and citations ===================== Please help us improving OpenLoops by sending feedback to [email protected] If you use OpenLoops (or an event sample generated with Sherpa+OpenLoops) please cite F. Cascioli, P. Maierhoefer and S. Pozzorini, Phys. Rev. Lett. 108 (2012) 111601, arXiv:1111.5206 In the computation of loop amplitudes, OpenLoops uses CutTools for OPP reduction and OneLOop to compute scalar integrals (unless other reduction libraries are installed and used). If you use CutTools and OneLOop please cite G. Ossola, C. Papadopoulos, R. Pittau, JHEP 0803 (2008) 042, arXiv:0711.3596 A. van Hameren, Comput. Phys. Commun. 182 (2011) 2427-2438, arXiv:1007.4716 ================ Sherpa+OpenLoops ================ OpenLoops can be used as a plug-in of Sherpa 2.1.0 or later. For the installation of Sherpa and the usage of Sherpa+OpenLoops please refer to the Sherpa documentation at https://sherpa.hepforge.org OpenLoops must be enabled by configuring Sherpa with the '--enable-openloops' option ./configure --enable-openloops=</path/to/OpenLoops> [other configure options] make make install The OpenLoops installation path can be modified at runtime by setting (in the Sherpa run card or command line) OL_PREFIX=</path/to/OpenLoops> To run Sherpa in combination with OpenLoops it is sufficient to set the flag Loop_Generator=OpenLoops in the Sherpa runcard. Standard Sherpa+OpenLoops run cards can be found at http://openloops.hepforge.org/sherpa-runcards
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