1// -*- C++ -*-
 2#include "Rivet/Analysis.hh"
 3#include "Rivet/Analyses/MC_Cent_pPb.hh"
 4#include "Rivet/Projections/ImpactParameterProjection.hh"
 5
 6namespace Rivet {
 7
 8
 9/// Generic analysis looking at various distributions of final state particles
10class MC_Cent_pPb_Calib : public Analysis {
11
12public:
13
14  RIVET_DEFAULT_ANALYSIS_CTOR(MC_Cent_pPb_Calib);
15
16  /// Book histograms and initialise projections before the run
17  void init() {
18
19    // One projection for the actual observable, and one for the
20    // generated impact parameter.
21    declare(MC_SumETFwdPbCentrality(), "Centrality");
22    declare(ImpactParameterProjection(), "IMP");
23    declare(MC_pPbMinBiasTrigger(), "Trigger");
24
25    // The calibrationhistogram:
26    book(_calib, "SumETPb", 100, 0.0, 200.0);
27
28    // If histogram was pre-loaded, the calibration is done.
29    _done = ( _calib->numEntries() > 0 );
30
31    // The alternative histogram based on impact parameter. Note that
32    // it MUST be named the same as the histogram for the experimental
33    // observable with an added _IMP suffix for the Pecentile<>
34    // binning to work properly.
35    book(_impcalib, "SumETPb_IMP", 400, 0.0, 20.0);
36
37
38  }
39  
40  /// Perform the per-event analysis
41  void analyze(const Event& event) {
42
43    if ( _done ) return;
44    
45    // The alternative centrality based on generated impact
46    // parameter, assumes that the generator does not describe the
47    // full final state, and should therefore be filled even if the
48    // event is not triggered.
49    _impcalib->fill(apply<SingleValueProjection>(event, "IMP")());
50
51    if ( !apply<TriggerProjection>(event, "Trigger")() ) vetoEvent;
52
53    _calib->fill(apply<SingleValueProjection>(event, "Centrality")());
54
55  }
56  
57  /// Finalize
58  void finalize() {
59
60    _calib->normalize();
61    _impcalib->normalize();
62
63  }
64
65private:
66
67  /// The calibration histograms.
68  Histo1DPtr _calib;
69  Histo1DPtr _impcalib;
70
71  /// Safeguard from adding to a pre-loaded histogram.
72  bool _done;
73
74};
75
76
77// The hook for the plugin system
78RIVET_DECLARE_PLUGIN(MC_Cent_pPb_Calib);
79
80}