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 Add a short analysis description here
 10  class CMD2_1995_I406880 : public Analysis {
 11  public:
 12
 13    /// Constructor
 14    RIVET_DEFAULT_ANALYSIS_CTOR(CMD2_1995_I406880);
 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      book(_nKpKm, "TMP/KpKm");
 27      book(_nK0K0, "TMP/K0K0");
 28      book(_n3pi, "TMP/3pi");
 29      book(_numEtaGamma, "TMP/EtaGamma");
 30    }
 31
 32    void findChildren(const Particle & p,map<long,int> & nRes, int &ncount) {
 33      for (const Particle &child : p.children()) {
 34	if(child.children().empty()) {
 35	  --nRes[child.pid()];
 36	  --ncount;
 37	}
 38	else
 39	  findChildren(child,nRes,ncount);
 40      }
 41    }
 42
 43    /// Perform the per-event analysis
 44    void analyze(const Event& event) {
 45      const FinalState& fs = apply<FinalState>(event, "FS");
 46      
 47      map<long,int> nCount;
 48      int ntotal(0);
 49      for (const Particle& p : fs.particles()) {
 50	nCount[p.pid()] += 1;
 51	++ntotal;
 52      }
 53      if(ntotal==2) {
 54	if(nCount[321]==1 && nCount[-321]==1)
 55	  _nKpKm->fill();
 56	else if(nCount[130]==1 && nCount[310]==1)
 57	  _nK0K0->fill();
 58      }
 59      else if(ntotal==3 && nCount[211] == 1 && nCount[-211] == 1 && nCount[111] == 1)
 60	_n3pi->fill();
 61      
 62      const FinalState& ufs = apply<FinalState>(event, "UFS");
 63      for (const Particle& p : ufs.particles()) {
 64	if(p.children().empty()) continue;
 65	// find the omega
 66	if(p.pid()==221) {
 67	  map<long,int> nRes = nCount;
 68	  int ncount = ntotal;
 69	  findChildren(p,nRes,ncount);
 70	  // eta pi+pi-
 71	  if(ncount!=1) continue;
 72	  bool matched = true;
 73          for(auto const & val : nRes) {
 74	    if(val.first==22) {
 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	    _numEtaGamma->fill();
 87	}
 88      }
 89    }
 90
 91
 92    /// Normalise histograms etc., after the run
 93    void finalize() {
 94      for(unsigned int ix=1;ix<5;++ix) {
 95	double sigma = 0., error = 0.;
 96	if(ix==1) {
 97	  sigma = _nKpKm->val();
 98	  error = _nKpKm->err();
 99	}
100	else if(ix==2) {
101	  sigma = _nK0K0->val();
102	  error = _nK0K0->err();
103	}
104	else if(ix==3) {
105	  sigma = _n3pi->val();
106	  error = _n3pi->err();
107	}
108	else if(ix==4) {
109	  sigma = _numEtaGamma->val();
110	  error = _numEtaGamma->err();
111	}
112	sigma *= crossSection()/ sumOfWeights() /nanobarn;
113	error *= crossSection()/ sumOfWeights() /nanobarn; 
114	Scatter2D temphisto(refData(1, 1, ix));
115	Scatter2DPtr mult;
116	book(mult, 1, 1, ix);
117	for (size_t b = 0; b < temphisto.numPoints(); b++) {
118	  const double x  = temphisto.point(b).x();
119	  pair<double,double> ex = temphisto.point(b).xErrs();
120	  pair<double,double> ex2 = ex;
121	  if(ex2.first ==0.) ex2. first=0.0001;
122	  if(ex2.second==0.) ex2.second=0.0001;
123	  if (inRange(sqrtS()/MeV, x-ex2.first, x+ex2.second)) {
124	    mult->addPoint(x, sigma, ex, make_pair(error,error));
125	  }
126	  else {
127	    mult->addPoint(x, 0., ex, make_pair(0.,.0));
128	  }
129	}
130      }
131    }
132    //@}
133
134
135    /// @name Histograms
136    //@{
137    CounterPtr _nKpKm,_nK0K0,_n3pi,_numEtaGamma;
138    //@}
139
140
141  };
142
143
144  // The hook for the plugin system
145  RIVET_DECLARE_PLUGIN(CMD2_1995_I406880);
146
147
148}