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Vertex smearing in FairPrimaryGenerator [message #11893] Thu, 26 May 2011 10:57
StefanoSpataro is currently offline  StefanoSpataro
Messages: 2736
Registered: June 2005
Location: Torino
first-grade participant

From: *to.infn.it
Dear all,
I have added some vertex smearing to the tdr macros, in order to follow the "shape" of the pellet target:

 FairPrimaryGenerator* primGen = new FairPrimaryGenerator();
  
  primGen->SetTarget(0., 0.0275.);
  primGen->SmearVertexZ(kTRUE);
  primGen->SetBeam(0., 0., 0.0275, 0.0275);
  primGen->SmearVertexXY(kTRUE);


The smearing on XY is done using a gaus function, but the smearing on Z is just an uniform distribution:


void FairPrimaryGenerator::MakeVertex()
...
  if (fSmearVertexZ) vz = gRandom->Uniform(vz - fTargetDz/2.,
                            vz + fTargetDz/2.);


Is it possible to add a gaus smearing function, so that:

  if (fSmearVertexZGaus) vz = gRandom->Gaus(vz, fTargetDz);


?
I cannot do it by myself because it is on the base folder. We need this change to start the production.
Many thanks in advance.


 
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