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 gamma gamma -> phi rho or omega
 10  class ARGUS_1994_I372451 : public Analysis {
 11  public:
 12
 13    /// Constructor
 14    RIVET_DEFAULT_ANALYSIS_CTOR(ARGUS_1994_I372451);
 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 histos
 26      if (inRange(sqrtS()/GeV, 1.5, 3.5)) {
 27        book(_nMeson, 1,1,1);
 28        book(_avg, 2,1,1);
 29      }
 30      else {
 31        throw Error("Invalid CMS energy for ARGUS_1994_I372451");
 32      }
 33    }
 34
 35    void findChildren(const Particle& p, map<long,int>& nRes, int& ncount) {
 36      for (const Particle &child : p.children()) {
 37        if (child.children().empty()) {
 38          nRes[child.pid()]-=1;
 39          --ncount;
 40        }
 41        else {
 42          findChildren(child,nRes,ncount);
 43        }
 44      }
 45    }
 46
 47    /// Perform the per-event analysis
 48    void analyze(const Event& event) {
 49      const FinalState& fs = apply<FinalState>(event, "FS");
 50      // find the final-state particles
 51      map<long,int> nCount;
 52      int ntotal(0);
 53      for (const Particle& p : fs.particles()) {
 54        nCount[p.pid()] += 1;
 55        ++ntotal;
 56      }
 57      const UnstableParticles& ufs = apply<UnstableParticles>(event, "UFS");
 58      Particles phis = ufs.particles(Cuts::pid==333);
 59      Particles rhos = ufs.particles(Cuts::pid==113 or Cuts::pid==223);
 60      for (const Particle& phi : phis) {
 61        bool matched=false;
 62       	map<long,int> nRes=nCount;
 63       	int ncount = ntotal;
 64       	findChildren(phi,nRes,ncount);
 65        for (const Particle & rho : rhos) {
 66          map<long,int> nRes2=nRes;
 67          int ncount2 = ncount;
 68          findChildren(rho,nRes2,ncount2);
 69          if (ncount2 !=0 ) continue;
 70          matched = true;
 71          for (auto const & val : nRes2) {
 72            if(val.second!=0) {
 73              matched = false;
 74              break;
 75            }
 76          }
 77          if (matched) {
 78            if (rho.pid()==113) {
 79              _nMeson->fill(sqrtS()/GeV);
 80            }
 81            else {
 82              _avg->fill("1.9 - 2.3"s);
 83            }
 84            break;
 85          }
 86        }
 87        if (matched) break;
 88      }
 89    }
 90
 91
 92    /// Normalise histograms etc., after the run
 93    void finalize() {
 94      const double sf = crossSection()/nanobarn/sumOfWeights();
 95      scale(_nMeson, sf);
 96      scale(_avg, sf);
 97    }
 98
 99    /// @}
100
101
102    /// @name Histograms
103    /// @{
104    Histo1DPtr _nMeson;
105    BinnedHistoPtr<string> _avg;
106    /// @}
107
108
109  };
110
111
112  RIVET_DECLARE_PLUGIN(ARGUS_1994_I372451);
113
114}