1// -*- C++ -*-
 2#include "Rivet/Analysis.hh"
 3#include "Rivet/Projections/FinalState.hh"
 4
 5
 6namespace Rivet {
 7
 8
 9  /// @brief Add a short analysis description here
10  class SND_2002_I587084 : public Analysis {
11  public:
12
13    /// Constructor
14    RIVET_DEFAULT_ANALYSIS_CTOR(SND_2002_I587084);
15
16
17    /// @name Analysis methods
18    /// @{
19
20    /// Book histograms and initialise projections before the run
21    void init() {
22
23      // Initialise and register projections
24      declare(FinalState(), "FS");
25      book(_numPiPiGamma, "TMP/PiPiGamma", refData(1,1,1));
26
27    }
28
29
30    /// Perform the per-event analysis
31    void analyze(const Event& event) {
32
33      const FinalState& fs = apply<FinalState>(event, "FS");
34
35      map<long,int> nCount;
36      int ntotal(0);
37      for (const Particle& p : fs.particles()) {
38        nCount[p.pid()] += 1;
39        ++ntotal;
40      }
41      // three particles (pi0 pi0 gamma)
42      if(ntotal!=3) vetoEvent;
43      if(nCount[111]==2 && nCount[22]==1)
44        _numPiPiGamma->fill(sqrtS()/MeV);
45    }
46
47
48    /// Normalise histograms etc., after the run
49    void finalize() {
50      scale(_numPiPiGamma,crossSection()/ sumOfWeights() /nanobarn);
51      Estimate1DPtr mult;
52      book(mult, 1, 1, 1);
53      barchart(_numPiPiGamma,mult);
54    }
55
56    /// @}
57
58
59    /// @name Histograms
60    /// @{
61    Histo1DPtr _numPiPiGamma;
62    /// @}
63
64
65  };
66
67
68  RIVET_DECLARE_PLUGIN(SND_2002_I587084);
69
70
71}