Changes between Version 2 and Version 3 of Systematics

Timestamp:

Nov 4, 2016, 11:21:09 PM (8 years ago)

Author:

Olivier Mattelaer

Comment:

--

Systematics

@@ -24 +24 @@
 == How to run the code
 
-To use either of those code, you need first to set in the run_card the parameter ('''use_syst''' on true) which is going to ask MG5aMC to add the additional information
-in the lhef such that those module can read the information and add the weights in the event file.
-Note that use_syst=T is actually the default but for interference type of generation where it is by default set to False since those information are unlikely to be correct.
+To use either of those code, you need first to set in the run_card the parameter 
+{{{
+   True = use_syst
+}}}
+which is going to ask MG5aMC to add the additional information in the lhef such that those module can read the information and add the weights in the event file.
+At leading order this is actually the default behavior (but for case which are not supported).
 
-If '''use_syst is True''' then by default we will automatically run SysCalc. If SysCalc is not installed on your machine then we will run "systematics" instead.
+With that line, the code will automatically run SysCalc. if that code is not installed/link to madgraph then we will automatically run the "systematics" module.
 You can change this behavior via the (hidden) parameter of the run_card
 '''systematics_program''' you give it one of the three following value: 
@@ -51 +54 @@
 
 Description of SysCalc is available here: https://cp3.irmp.ucl.ac.be/projects/madgraph/wiki/SysCalc
+For all question related to SysCalc please contact Alexis Kalogeropoulos.
  
 == Systematics (python) module
@@ -96 +100 @@
    ['--pdf=central', '--dyn=-1,3', '--together=mur,muf'] = systematics_arguments
 }}}
+in that case the other entry of the run_card related to the systematics computation are just ignored.
 
 
@@ -104 +109 @@
 '''on the flight''' this methods performs the re-weighting during the generation of the events. The output file contain the additional weight but '''NOT''' the information to perform an additional re-weighting  (by default) forbidding to perform a different re-weighting later (different pdf/scale choice/...)
 The second method is the "systematics" module of MG5aMC, where additional information will be written in the file in order to compute systematics weight independently of the event generation.
+
 
 == On the flight method