Changes between Version 3 and Version 4 of FAQ-General-1

Timestamp:

Oct 22, 2013, 2:30:25 PM (11 years ago)

Author:

Olivier Mattelaer

Comment:

--

FAQ-General-1

@@ -12 +12 @@
 If you just want to hard-code a cut, all you need to do is modify the file SubProcesses/cuts.f, where all external particle 4-momenta are given in the P(0:3,nexternal) array (energy in P(0,I) and 3-momenta in P(1:3,I)). The order of the external particles depends on the subprocess, and can be guessed from the name of the subprocess Pxxxxxxx directory or can be seen from the Pxxxxxxx/leshouche.inc file.
 
+WARNING: By default, various symmetries are taken into account in the process (initial state for example). If your cut didn't agree with those symmetries,
+you should forbid MG to use those symmentries for the computation of the matrix-element (by doing set group_subprocesses False)
+
 If you want to "standardize" your cuts and be able to change them from the run_card.dat as the default madgraph cuts, you need to modify the files
    * Source/setrun.f