Version 1.0.1 imported from tarball.

README

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+
+=========
+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]
+
+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
+
+    ./scons auto=<processes>
+
+where <processes> is a comma separated list of the processes or
+process collections (ending with "/") which should be installed.
+A list of the available process libraries can be found here
+
+    http://openloops.hepforge.org/processes
+
+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 from SVN (when it's already installed from SVN)
+================================================================
+
+To pull updates from SVN and compile
+
+    svn update
+    ./scons
+
+To update process libraries (will install new libraries if available and
+replace old libraries if newer versions are available)
+
+    ./scons auto=lhc/
+
+After updating OpenLoops, updating the installed processes might be required
+for compatibility.
+
+
+=====================
+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