1// -*- C++ -*-
  2#include "Rivet/Analysis.hh"
  3#include "Rivet/Projections/FinalState.hh"
  4#include "Rivet/Projections/ChargedFinalState.hh"
  5#include "Rivet/Projections/UnstableParticles.hh"
  6#include "Rivet/Projections/Beam.hh"
  7
  8namespace Rivet {
  9
 10
 11  /// @brief kaon spectra at LEP1
 12  class DELPHI_1995_I377487 : public Analysis {
 13  public:
 14
 15    /// Constructor
 16    RIVET_DEFAULT_ANALYSIS_CTOR(DELPHI_1995_I377487);
 17
 18
 19    /// @name Analysis methods
 20    /// @{
 21
 22    /// Book histograms and initialise projections before the run
 23    void init() {
 24      declare(Beam(), "Beams");
 25      declare(ChargedFinalState(), "FS");
 26      declare(UnstableParticles(), "UFS");
 27
 28      // Book histograms
 29      book(_h_K0_x , 8, 1, 1);
 30      book(_h_K0_xi, 9, 1, 1);
 31      book(_h_Ks_x ,10, 1, 1);
 32
 33    }
 34
 35
 36    /// Perform the per-event analysis
 37    void analyze(const Event& event) {
 38
 39      if (_edges.empty())  _edges = _h_K0_x->xEdges();
 40
 41      // First, veto on leptonic events by requiring at least 4 charged FS particles
 42      const FinalState& fs = apply<FinalState>(event, "FS");
 43      const size_t numParticles = fs.particles().size();
 44
 45      // Even if we only generate hadronic events, we still need a cut on numCharged >= 2.
 46      if (numParticles < 2) {
 47        MSG_DEBUG("Failed leptonic event cut");
 48        vetoEvent;
 49      }
 50      MSG_DEBUG("Passed leptonic event cut");
 51
 52      // Get beams and average beam momentum
 53      const ParticlePair& beams = apply<Beam>(event, "Beams").beams();
 54      const double meanBeamMom = ( beams.first.p3().mod() +
 55                                   beams.second.p3().mod() ) / 2.0;
 56      MSG_DEBUG("Avg beam momentum = " << meanBeamMom);
 57
 58      // Final state of unstable particles to get particle spectra
 59      const UnstableParticles& ufs = apply<UnstableParticles>(event, "UFS");
 60
 61      for (const Particle& p : ufs.particles(Cuts::pid==130 or Cuts::pid==310 or Cuts::abspid==323)) {
 62        const double xp = p.p3().mod()/meanBeamMom;
 63        if (abs(p.pid())==323) {
 64          _h_Ks_x->fill(xp);
 65        }
 66        else {
 67          _h_K0_x->fill(map2string(xp));
 68          _h_K0_xi->fill(-log(xp));
 69        }
 70      }
 71    }
 72
 73    string map2string(const double val) const {
 74      const size_t idx = _axis.index(val);
 75      if (idx || idx <= _edges.size())  return _edges[idx-1];
 76      return "OTHER";
 77    }
 78
 79
 80    /// Normalise histograms etc., after the run
 81    void finalize() {
 82
 83      scale(_h_K0_x,  1./sumOfWeights());
 84      scale(_h_K0_xi, 1./sumOfWeights());
 85      scale(_h_Ks_x,  1./sumOfWeights());
 86    }
 87
 88    /// @}
 89
 90
 91    /// @name Histograms
 92    /// @{
 93    BinnedHistoPtr<string> _h_K0_x;
 94    Histo1DPtr _h_K0_xi,_h_Ks_x;
 95    vector<string> _edges;
 96    YODA::Axis<double> _axis{ 0.00030213628351706805, 0.00048341905738733416, 0.00048343557923922857,
 97                              0.00026205300091453314, 0.0007702529509799692, 0.0009481642553664134,
 98                              0.0017226600969315643, 0.002004423179522298, 0.0016843611112658217,
 99                              0.0026292281438344, 0.00267627755270744, 0.0036267300396739185,
100                              0.004237796021633787, 0.005212931632136056, 0.007189937374782032,
101                              0.007726421785666127, 0.010282046710587495, 0.012196841637666128,
102                              0.014664716763387292, 0.018701111778413465, 0.02210348200534462,
103                              0.027403036058393532, 0.03380578808779788, 0.04112055882855764,
104                              0.049671035882778436, 0.22518836390597363, 1.0 };
105    /// @}
106
107
108  };
109
110
111  RIVET_DECLARE_PLUGIN(DELPHI_1995_I377487);
112
113
114}