Rivet analyses

// -*- C++ -*-
#include "Rivet/Analysis.hh"
#include "Rivet/Projections/FastJets.hh"
#include "Rivet/Projections/UnstableParticles.hh"

namespace Rivet {


  /// @brief e+ e- -> hadrons
  class CLEO_2006_I691720 : public Analysis {
  public:

    /// Constructor
    RIVET_DEFAULT_ANALYSIS_CTOR(CLEO_2006_I691720);


    /// @name Analysis methods
    /// @{

    /// Book histograms and initialise projections before the run
    void init() {

      // Initialise and register projections
      declare(FinalState(), "FS");
      declare(UnstableParticles(), "UFS");

      // Book histograms
      for (int ix = 1; ix < 18; ++ix) {
        if (ix == 6 || ix == 16) continue;
        book(_nMeson[ix], 1, 1, ix);
      }
      for (const string& en : _nMeson[1].binning().edges<0>()) {
        double eval = stod(en) * GeV;
        if (isCompatibleWithSqrtS(eval)) {
          _sqs = en;
          break;
        }
      }
      raiseBeamErrorIf(_sqs.empty());
    }

    void findChildren(const Particle& p, map<long, int>& nRes, int& ncount) const {
      for (const Particle& child : p.children()) {
        if (child.children().empty()) {
          nRes[child.pid()] -= 1;
          --ncount;
        }
        else {
          findChildren(child, nRes, ncount);
        }
      }
    }

    /// Perform the per-event analysis
    void analyze(const Event& event) {
      const FinalState& fs = apply<FinalState>(event, "FS");

      map<long, int> nCount;
      int ntotal(0);
      for (const Particle& p : fs.particles()) {
        nCount[p.pid()] += 1;
        ++ntotal;
      }
      if (ntotal == 3) {
        if (nCount[211] == 1 && nCount[-211] == 1 && nCount[111] == 1) _nMeson[1]->fill(_sqs);
      }
      const FinalState& ufs = apply<FinalState>(event, "UFS");
      for (size_t ix = 0; ix < ufs.particles().size(); ++ix) {
        const Particle& p1 = ufs.particles()[ix];
        if (p1.children().empty()) continue;
        if (p1.pid() != 113 && abs(p1.pid()) != 313) continue;
        map<long, int> nRes = nCount;
        int ncount = ntotal;
        findChildren(p1, nRes, ncount);
        if (p1.pid() == 113 || p1.pid() == 223 || p1.pid() == 10113) {
          if (ncount != 1) continue;
          bool matched = true;
          for (const auto& val : nRes) {
            if (abs(val.first) == 111 && val.second != 1) {
              matched = false;
              break;
            }
            else if (val.second != 0) {
              matched = false;
              break;
            }
          }
          if (matched) {
            if (p1.pid() == 113) {
              _nMeson[2]->fill(_sqs);
              _nMeson[3]->fill(_sqs);
            }
            else if (p1.pid() == 223) {
              _nMeson[5]->fill(_sqs);
            }
            else if (p1.pid() == 10113) {
              _nMeson[15]->fill(_sqs);
            }
          }
        }
        else if (p1.pid() == abs(113) || abs(p1.pid()) == 10113) {
          if (ncount != 1) continue;
          bool matched = true;
          int ipi = p1.pid() > 0 ? -211 : 211;
          for (const auto& val : nRes) {
            if (abs(val.first) == ipi && val.second != 1) {
              matched = false;
              break;
            }
            else if (val.second != 0) {
              matched = false;
              break;
            }
          }
          if (matched) {
            if (p1.pid() == abs(113)) {
              _nMeson[2]->fill(_sqs);
              _nMeson[4]->fill(_sqs);
            }
            else {
              _nMeson[15]->fill(_sqs);
              _nMeson[17]->fill(_sqs);
            }
          }
        }
        else if (p1.pid() == 323) {
          if (ncount != 1) continue;
          bool matched = true;
          int iK = p1.pid() == 323 ? -321 : 321;
          for (const auto& val : nRes) {
            if (abs(val.first) == iK && val.second != 1) {
              matched = false;
              break;
            }
            else if (val.second != 0) {
              matched = false;
              break;
            }
          }
          if (matched) {
            if (_sqs == "3.671"s) _nMeson[14]->fill(_sqs);
          }
        }
        // second unstable particle
        if (p1.abspid() != 313 && p1.pid() != 113 && p1.pid() != 223 && p1.pid() != 333 && p1.pid() != 221
            && p1.pid() != 331)
          continue;
        for (size_t iy = ix + 1; iy < ufs.particles().size(); ++iy) {
          const Particle& p2 = ufs.particles()[iy];
          map<long, int> nRes2 = nRes;
          int ncount2 = ncount;
          findChildren(p2, nRes2, ncount2);
          if (ncount != 0) continue;
          bool matched = true;
          for (const auto& val : nRes2) {
            if (val.second != 0) {
              matched = false;
              break;
            }
          }
          if (!matched) continue;
          if ((p1.pid() == 113 && p2.pid() == 221) || (p2.pid() == 113 && p1.pid() == 221)) {
            _nMeson[7]->fill(_sqs);
          }
          else if ((p1.pid() == 223 && p2.pid() == 221) || (p2.pid() == 223 && p1.pid() == 221)) {
            _nMeson[8]->fill(_sqs);
          }
          else if ((p1.pid() == 333 && p2.pid() == 221) || (p2.pid() == 333 && p1.pid() == 221)) {
            _nMeson[9]->fill(_sqs);
          }
          else if ((p1.pid() == 113 && p2.pid() == 331) || (p2.pid() == 113 && p1.pid() == 331)) {
            _nMeson[10]->fill(_sqs);
          }
          else if ((p1.pid() == 223 && p2.pid() == 331) || (p2.pid() == 223 && p1.pid() == 331)) {
            if (_sqs == "3.773"s) _nMeson[11]->fill(_sqs);
          }
          else if ((p1.pid() == 333 && p2.pid() == 331) || (p2.pid() == 333 && p1.pid() == 331)) {
            if (_sqs == "3.773"s) _nMeson[12]->fill(_sqs);
          }
          else if ((p1.pid() == 313 && p2.pid() == -313) || (p2.pid() == 313 && p1.pid() == -313)) {
            _nMeson[13]->fill(_sqs);
          }
        }
      }
    }


    /// Normalise histograms etc., after the run
    void finalize() {
      scale(_nMeson, crossSection() / sumOfWeights() / picobarn);
    }

    /// @}


    /// @name Histograms
    /// @{
    map<int, BinnedHistoPtr<string>> _nMeson;
    string _sqs = "";
    /// @}
  };


  RIVET_DECLARE_PLUGIN(CLEO_2006_I691720);


}