Data Formats in SimG4Core

RECO Data Formats

SimG4Core collections (in RECOSIM only)
g4SimHits	edm::SimTrackContainer	collection of (selected) tracks produced during Geant4 tracing of the generator's particles through CMS detector
g4SimHits	edm::SimVertexContainer	collection of vertices associated with the SimTrack's (see above)

How to use the table

In the header of your analyzer you should have the header(s) of the data format(s) you will access. SimTrack belongs to the SimDataFormats/Track package, and SimVertex belongs to the SimDataFormats/Vertex package; the headers are located in the /interface subdirectories. Thus, your EDAnalyzer should contain the following:

#include "SimDataFormats/Track/interface/SimTrack.h"
#include "SimDataFormats/Track/interface/SimTrackContainer.h"
#include "SimDataFormats/Vertex/interface/SimVertex.h"
#include "SimDataFormats/Vertex/interface/SimVertexContainer.h"

In the analyze(const Event& e, const EventSetup& ) method you should do something like the following:

edm::Handle<edm::SimTrackContainer> SimTk;
edm::Handle<edm::SimVertexContainer> SimVtx;
e.getByLabel("g4SimHits",SimTk);
e.getByLabel("g4SimHits",SimVtx);
for ( edm::SimTrackContainer::const_iterator itk=SimTk->begin(); itk!=SimTk->end(); ++itk )
{
// your code here
}
for ( edm::SimVertexContainer::const_iterator ivtx=SimVtx->begin(); ivtx!=SimVtx->end(); ++ivtx )
{
// your code here
}

You can also excercise your curiosity and view more usage details in the example analyzer SimTrackSimVertexDumper.cc.

Note that edm::SimTrackContainer and edm::SimVertexContainer are actually typedef, respectively, for the following:

std::vector<SimTrack>
std::vector<SimVertex>

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