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- -> 3(pi+pi-)pi0
 10  class CMD3_2019_I1720610 : public Analysis {
 11  public:
 12
 13    /// Constructor
 14    RIVET_DEFAULT_ANALYSIS_CTOR(CMD3_2019_I1720610);
 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(Cuts::pid==221 || Cuts::pid==223), "UFS");
 26
 27      // Book histograms
 28      book(_sigma[0], "TMP/c_all",   refData(1, 1, 1));
 29      book(_sigma[1], "TMP/c_eta",   refData(1, 1, 2));
 30      book(_sigma[2], "TMP/c_omega", refData(1, 1, 3));
 31
 32    }
 33
 34    void findChildren(const Particle& p, map<long,int>& nRes, int& ncount) {
 35      for (const Particle& child : p.children()) {
 36        if (child.children().empty()) {
 37          --nRes[child.pid()];
 38          --ncount;
 39        }
 40        else {
 41          findChildren(child,nRes,ncount);
 42        }
 43      }
 44    }
 45
 46    /// Perform the per-event analysis
 47    void analyze(const Event& event) {
 48      // find the final-state particles
 49      const FinalState& fs = apply<FinalState>(event, "FS");
 50      map<long,int> nCount;
 51      int ntotal(0);
 52      for (const Particle& p : fs.particles()) {
 53        nCount[p.pid()] += 1;
 54        ++ntotal;
 55      }
 56      if (ntotal==7 && nCount[211]==3 && nCount[-211]==3 && nCount[111] ==1 ) {
 57        _sigma[0]->fill(sqrtS()/MeV);
 58      }
 59      // find omega/phi + eta
 60      const FinalState& ufs = apply<FinalState>(event, "UFS");
 61      bool found=false;
 62      for (const Particle& p : ufs.particles()) {
 63        if(p.children().empty()) continue;
 64        map<long,int> nRes = nCount;
 65        int ncount = ntotal;
 66        findChildren(p,nRes,ncount);
 67        // eta/omega 2(pi+pi-)
 68        if(ncount==4) {
 69          bool matched = true;
 70          for (const auto& val : nRes) {
 71            if (abs(val.first)==211 ) {
 72              if (val.second !=2) {
 73                matched = false;
 74                break;
 75              }
 76            }
 77            else if(val.second!=0) {
 78              matched = false;
 79              break;
 80            }
 81          }
 82          if (matched) {
 83            if (p.pid()==221) {
 84              _sigma[1]->fill(sqrtS()/MeV);
 85            }
 86            else if (p.pid()==223) {
 87              _sigma[2]->fill(sqrtS()/MeV);
 88            }
 89            found = true;
 90            break;
 91          }
 92        }
 93        if (found) break;
 94      }
 95
 96    }
 97
 98
 99    /// Normalise histograms etc., after the run
100    void finalize() {
101      const double fact = crossSection()/nanobarn/sumOfWeights();
102      for(unsigned int ix=0;ix<3;++ix) {
103        scale(_sigma[ix], fact);
104        Estimate1DPtr tmp;
105        book(tmp,1,1,1+ix);
106        barchart(_sigma[ix],tmp);
107      }
108    }
109
110    /// @}
111
112
113    /// @name Histograms
114    /// @{
115    Histo1DPtr _sigma[3];
116    /// @}
117
118
119  };
120
121
122  RIVET_DECLARE_PLUGIN(CMD3_2019_I1720610);
123
124
125}