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| // -*- C++ -*-
#include "Rivet/Tools/AtlasCommon.hh"
#include "Rivet/Projections/ImpactParameterProjection.hh"
#include "Rivet/Analysis.hh"
namespace Rivet {
class ATLAS_PBPB_CENTRALITY : public Analysis {
public:
RIVET_DEFAULT_ANALYSIS_CTOR(ATLAS_PBPB_CENTRALITY);
/// Book histograms and initialise projections before the run
void init() {
// One projection for the actual observable, and one for the
// generated impact parameter.
declare(ATLAS::SumET_PBPB_Centrality(), "Centrality");
declare(ImpactParameterProjection(), "IMP");
declare(ATLAS::MinBiasTrigger(), "Trigger");
// The calibration histogram:
book(_calib, "sumETFwd");
// The alternative histogram based on impact parameter. Note that
// it MUST be named the same as the histogram for the experimental
// observable with an added _IMP suffix for the Pecentile<>
// binning to work properly.
book(_impcalib, "sumETFwd_IMP", 400, 0.0, 20.0);
}
/// Perform the per-event analysis
void analyze(const Event& event) {
// The alternative centrality based on generated impact
// parameter, assumes that the generator does not describe the
// full final state, and should therefore be filled even if the
// event is not triggered.
_impcalib->fill(apply<SingleValueProjection>(event, "IMP")());
if ( !apply<ATLAS::MinBiasTrigger>(event, "Trigger")() ) vetoEvent;
_calib->fill(apply<ATLAS::SumET_PBPB_Centrality>(event, "Centrality")());
}
/// Finalize
void finalize() {
_calib->normalize();
_impcalib->normalize();
}
private:
/// The calibration histograms.
Histo1DPtr _calib;
Histo1DPtr _impcalib;
};
// The hook for the plugin system
RIVET_DECLARE_PLUGIN(ATLAS_PBPB_CENTRALITY);
}
|