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--- gauss:gauss [2011/10/29 15:22] – decianm
+++ gauss:gauss [2012/03/29 16:02] – decianm
@@ Line 15: / Line 15: @@
 The root file can then be run over with an MCTupleTool in DaVinci (with certain restrictions, i.e. only tools which only access 4-vectors will run...)
+===== Running EvtGen standalone =====
+You can run EvtGen standalone, letting the particles decay at rest. This is very fast, as no underlying event has to be generated.
+A prototype file could look like (Gauss v41r1):
+<code python>
+#Event Type: 11114001
+from Configurables import Generation
+Generation().EventType = 11114001
+from Configurables import StandAloneDecayTool
+Generation().SampleGenerationTool = "StandAloneDecayTool";
+Generation().addTool( StandAloneDecayTool )
+Generation().StandAloneDecayTool.ProductionTool = "PythiaProduction";
+from Configurables import ToolSvc
+from Configurables import EvtGenDecay
+ToolSvc().addTool( EvtGenDecay )
+ToolSvc().EvtGenDecay.UserDecayFile ="$DECFILESROOT/dkfiles/Bd_Kstmumu=DecProdCut.dec"
+Generation().StandAloneDecayTool.SignalPIDList = [ 511,-511 ]
+</code>
+These both things (running EvtGen standalone and writing out MCParticles) can of course be combined.

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