1// -*- C++ -*-
 2#include "Rivet/Analysis.hh"
 3#include "Rivet/Projections/FinalState.hh"
 4#include "Rivet/Projections/UnstableParticles.hh"
 5
 6namespace Rivet {
 7
 8
 9  /// @brief e+e- -> omega eta
10  class SND_2016_I1473343 : public Analysis {
11  public:
12
13    /// Constructor
14    RIVET_DEFAULT_ANALYSIS_CTOR(SND_2016_I1473343);
15
16
17    /// @name Analysis methods
18    /// @{
19
20    /// Book histograms and initialise projections before the run
21    void init() {
22      // Initialise and register projections
23      declare(FinalState(), "FS");
24      declare(UnstableParticles(), "UFS");
25      book(_nOmegaEta, "/TMP/nOmegaEta", refData(1,1,1));
26    }
27
28    void findChildren(const Particle & p,map<long,int> & nRes, int &ncount) {
29      for (const Particle &child : p.children()) {
30	if(child.children().empty()) {
31	  nRes[child.pid()]-=1;
32	  --ncount;
33	}
34	else
35	  findChildren(child,nRes,ncount);
36      }
37    }
38
39    /// Perform the per-event analysis
40    void analyze(const Event& event) {
41      const FinalState& fs = apply<FinalState>(event, "FS");
42      map<long,int> nCount;
43      int ntotal(0);
44      for (const Particle& p : fs.particles()) {
45	nCount[p.pid()] += 1;
46	++ntotal;
47      }
48      const FinalState& ufs = apply<FinalState>(event, "UFS");
49      for (const Particle& p : ufs.particles()) {
50	if(p.children().empty()) continue;
51	if(p.pid()!=223) continue;
52	map<long,int> nRes = nCount;
53	int ncount = ntotal;
54	findChildren(p,nRes,ncount);
55	for (const Particle& p2 : ufs.particles()) {
56	  if(p2.pid()!=221) continue;
57	  map<long,int> nResB = nRes;
58	  int ncountB = ncount;
59	  findChildren(p2,nResB,ncountB);
60	  if(ncountB!=0) continue;
61	  bool matched2 = true;
62	  for(auto const & val : nResB) {
63	    if(val.second!=0) {
64	      matched2 = false;
65	      break;
66	    }
67	  }
68	  if(matched2) {
69	    _nOmegaEta->fill(sqrtS()/GeV);
70	    break;
71	  }
72	}
73      }
74    }
75
76
77    /// Normalise histograms etc., after the run
78    void finalize() {
79      scale(_nOmegaEta, crossSection()/ sumOfWeights() /nanobarn);
80      Estimate1DPtr mult;
81      book(mult, 1, 1, 1);
82      barchart(_nOmegaEta,mult);
83    }
84    /// @}
85
86
87    /// @name Histograms
88    /// @{
89    Histo1DPtr _nOmegaEta;
90    /// @}
91
92
93  };
94
95
96  RIVET_DECLARE_PLUGIN(SND_2016_I1473343);
97
98
99}