1// -*- C++ -*-
 2#include "Rivet/Analysis.hh"
 3#include "Rivet/Analyses/AtlasCommon.hh"
 4#include "Rivet/Projections/ImpactParameterProjection.hh"
 5
 6namespace Rivet {
 7
 8
 9  class ATLAS_CENT_PPB_CALIB : public Analysis {
10  public:
11
12    RIVET_DEFAULT_ANALYSIS_CTOR(ATLAS_CENT_PPB_CALIB);
13
14    /// Book histograms and initialise projections before the run
15    void init() {
16
17      // One projection for the actual observable, and one for the
18      // generated impact parameter.
19      declare(ATLAS::SumET_PB_Centrality(), "Centrality");
20      declare(ImpactParameterProjection(), "IMP");
21      declare(ATLAS::MinBiasTrigger(), "Trigger");
22
23      // The calibrationhistogram:
24      book(_calib, "SumETPb", 100, 0.0, 200.0);
25
26      // The alternative histogram based on impact parameter. Note that
27      // it MUST be named the same as the histogram for the experimental
28      // observable with an added _IMP suffix for the Pecentile<>
29      // binning to work properly.
30      book(_impcalib, "SumETPb_IMP", 400, 0.0, 20.0);
31    }
32
33
34    /// Perform the per-event analysis
35    void analyze(const Event& event) {
36
37      // The alternative centrality based on generated impact
38      // parameter, assumes that the generator does not describe the
39      // full final state, and should therefore be filled even if the
40      // event is not triggered.
41      _impcalib->fill(apply<SingleValueProjection>(event, "IMP")());
42
43      if ( !apply<ATLAS::MinBiasTrigger>(event, "Trigger")() ) vetoEvent;
44
45      _calib->fill(apply<ATLAS::SumET_PB_Centrality>(event, "Centrality")());
46    }
47
48
49    /// Finalize
50    void finalize() {
51      if (_calib->integral())     _calib->normalize();
52      if (_impcalib->integral())  _impcalib->normalize();
53    }
54
55
56  private:
57
58    /// The calibration histograms.
59    Histo1DPtr _calib;
60    Histo1DPtr _impcalib;
61
62  };
63
64
65  RIVET_DECLARE_PLUGIN(ATLAS_CENT_PPB_CALIB);
66
67}