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- -> K+K-pi0
 10  class SND_2020_I1806118 : public Analysis {
 11  public:
 12
 13    /// Constructor
 14    RIVET_DEFAULT_ANALYSIS_CTOR(SND_2020_I1806118);
 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      declare(UnstableParticles(), "UFS");
 26
 27      // Book histograms
 28      book( _nKKPi, 1, 1, 1);
 29      book(_nPhiPi,"TMP/nPhiPi", refData(2,1,1));
 30      for (const string& en : _nKKPi.binning().edges<0>()) {
 31        double end = std::stod(en)*GeV;
 32        if(isCompatibleWithSqrtS(end)) {
 33          _ecms = en;
 34          break;
 35        }
 36      }
 37    }
 38
 39    void findChildren(const Particle & p,map<long,int> & nRes, int &ncount) {
 40      for (const Particle &child : p.children()) {
 41	if(child.children().empty()) {
 42	  nRes[child.pid()]-=1;
 43	  --ncount;
 44	}
 45	else
 46	  findChildren(child,nRes,ncount);
 47      }
 48    }
 49
 50    /// Perform the per-event analysis
 51    void analyze(const Event& event) {
 52      const FinalState& fs = apply<FinalState>(event, "FS");
 53
 54      map<long,int> nCount;
 55      int ntotal(0);
 56      for (const Particle& p : fs.particles()) {
 57	nCount[p.pid()] += 1;
 58	++ntotal;
 59      }
 60      // KK pi state
 61      if(ntotal==3 && nCount[321]==1 &&
 62	 nCount[-321]==1 && nCount[111]==1)
 63	_nKKPi->fill(_ecms);
 64      // phi pi state
 65      const FinalState& ufs = apply<FinalState>(event, "UFS");
 66      for (const Particle& p : ufs.particles(Cuts::pid==333)) {
 67	if(p.children().empty()) continue;
 68	map<long,int> nRes = nCount;
 69	int ncount = ntotal;
 70	findChildren(p,nRes,ncount);
 71	if(ncount!=1) continue;
 72	bool matched = true;
 73	for(auto const & val : nRes) {
 74	  if(val.first==111) {
 75	    if(val.second!=1) {
 76	      matched = false;
 77	      break;
 78	      }
 79	  }
 80	  else if(val.second!=0) {
 81	    matched = false;
 82	    break;
 83	  }
 84	}
 85	if(matched) {
 86	  _nPhiPi->fill(sqrtS()/GeV);
 87	  break;
 88	}
 89      }
 90    }
 91
 92
 93    /// Normalise histograms etc., after the run
 94    void finalize() {
 95      double fact =  crossSection()/ sumOfWeights() /nanobarn;
 96      scale(_nKKPi ,fact);
 97      scale(_nPhiPi,fact);
 98      Estimate1DPtr  mult;
 99      book(mult, 2, 1, 1);
100      barchart(_nPhiPi,mult);
101    }
102    /// @}
103
104
105    /// @name Histograms
106    /// @{
107    BinnedHistoPtr<string> _nKKPi;
108    Histo1DPtr _nPhiPi;
109    string _ecms;
110    /// @}
111
112
113  };
114
115
116  RIVET_DECLARE_PLUGIN(SND_2020_I1806118);
117
118}