1// -*- C++ -*-
 2#include "Rivet/Analysis.hh"
 3#include "Rivet/Projections/UnstableParticles.hh"
 4#include "Rivet/Projections/FinalState.hh"
 5
 6
 7namespace Rivet {
 8
 9
10  /// @brief e+e- > pi+ pi- 2pi0 (including omega)
11  class BABAR_2017_I1621593 : public Analysis {
12  public:
13
14    /// Constructor
15    RIVET_DEFAULT_ANALYSIS_CTOR(BABAR_2017_I1621593);
16
17
18    /// @name Analysis methods
19    /// @{
20
21    /// Book histograms and initialise projections before the run
22    void init() {
23
24      // Initialise and register projections
25      declare(FinalState(), "FS");
26      declare(UnstableParticles(), "UFS");
27      for(unsigned int ix=0;ix<2;++ix)
28        book(_mult[ix], "TMP/mult_"+toString(ix), refData(1+ix, 1, 1));
29    }
30
31
32    /// Perform the per-event analysis
33    void analyze(const Event& event) {
34      const FinalState& fs = apply<FinalState>(event, "FS");
35
36      map<long,int> nCount;
37      int ntotal(0);
38      for (const Particle& p : fs.particles()) {
39        nCount[p.pid()] += 1;
40        ++ntotal;
41      }
42      if(ntotal!=4) vetoEvent;
43      if(nCount[-211]==1&&nCount[211]==1&&nCount[111]==2) {
44        _mult[0]->fill(sqrtS()/GeV);
45        const FinalState& ufs = apply<FinalState>(event, "UFS");
46        if (!ufs.particles(Cuts::pid==223).empty()) {
47          _mult[1]->fill(sqrtS()/GeV);
48        }
49      }
50
51    }
52
53
54    /// Normalise histograms etc., after the run
55    void finalize() {
56      double fact = crossSection()/ sumOfWeights() /nanobarn;
57      for(size_t ix=0;ix<2;++ix) {
58        scale(_mult[ix],fact);
59        Estimate1DPtr tmp;
60        book(tmp,1+ix,1,1);
61        barchart(_mult[ix],tmp);
62      }
63    }
64
65    /// @}
66
67    /// @name Histograms
68    /// @{
69    Histo1DPtr _mult[2];
70    /// @}
71
72
73  };
74
75
76  RIVET_DECLARE_PLUGIN(BABAR_2017_I1621593);
77
78
79}