[Openloops-announce] New OpenLoops release (including COLLIER)

[Jonas Lindert]

Dear OpenLoops user,

we just released an updated version of OpenLoops (OpenLoops-1.3, svn: 1942; http://www.hepforge.org/archive/openloops/OpenLoops-1.3.0.tar.gz <http://www.hepforge.org/archive/openloops/OpenLoops-1.3.0.tar.gz>). If you downloaded the previous version via svn in order to update you can simply run:
./openloops update

This version is the first public release including the tensor reduction library COLLIER (in version collier-1.0) developed by A. Denner, S. Dittmaier and L. Hofer. Using OpenLoops together with COLLIER will further significantly increase the performance of most one-loop amplitudes. In particular its high degree of numerical stability requires a significantly smaller amount of phase-space points to be reevaluated at higher numerical precision. Furthermore, especially the performance of loop-squared amplitudes highly benefits from the tensor integral reduction implemented in COLLIER. 

For the moment CutTools remains our default reduction library. However, we recommend to use the COLLIER library everywhere. You can switch to COLLIER setting the OpenLoops parameter preset=2 (for loop-induced processes preset=3 should be used); for example in any Sherpa Run-Card one can set: 
OL_PARAMETERS preset 2

Additionally this new release contains various improvements and bugfixes as detailed on our hepforge page (http://openloops.hepforge.org/log.html <http://openloops.hepforge.org/log.html>). 

Users with access to the public_collier branch should update to the public branch, as public_collier will not be updated.

Best regards,
Jonas, Philipp and Stefano


P.s.: Please register to our mailing list (https://www.hepforge.org/lists/listinfo/openloops-announce <https://www.hepforge.org/lists/listinfo/openloops-announce>) in order to receive future release announcements. 







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