1// -*- C++ -*-
  2#include "Rivet/Analysis.hh"
  3#include "Rivet/Projections/Beam.hh"
  4#include "Rivet/Projections/ChargedFinalState.hh"
  5
  6#define I_KNOW_THE_INITIAL_QUARKS_PROJECTION_IS_DODGY_BUT_NEED_TO_USE_IT
  7#include "Rivet/Projections/InitialQuarks.hh"
  8
  9namespace Rivet {
 10
 11
 12  /// @brief charged multiplicity at 58 GeV
 13  class VENUS_1998_I453613 : public Analysis {
 14  public:
 15
 16    /// Constructor
 17    RIVET_DEFAULT_ANALYSIS_CTOR(VENUS_1998_I453613);
 18
 19
 20    /// @name Analysis methods
 21    //@{
 22
 23    /// Book histograms and initialise projections before the run
 24    void init() {
 25      declare(Beam(), "Beams");
 26      declare(ChargedFinalState(), "CFS");
 27      declare(InitialQuarks(), "IQF");
 28      book(_cLight , "/TMP/CLIGHT" );
 29      book(_cBottom, "/TMP/CBOTTOM");
 30      book(_weightLight , "/TMP/WLIGHT" );
 31      book(_weightBottom, "/TMP/WBOTTOM");
 32    }
 33
 34
 35    /// Perform the per-event analysis
 36    void analyze(const Event& event) {
 37      // Even if we only generate hadronic events, we still need a cut on numCharged >= 2.
 38      const FinalState& cfs = apply<FinalState>(event, "CFS");
 39      if (cfs.size() < 2) vetoEvent;
 40
 41
 42      int flavour = 0;
 43      const InitialQuarks& iqf = apply<InitialQuarks>(event, "IQF");
 44
 45      // If we only have two quarks (qqbar), just take the flavour.
 46      // If we have more than two quarks, look for the highest energetic q-qbar pair.
 47      if (iqf.particles().size() == 2) {
 48        flavour = iqf.particles().front().abspid();
 49      }
 50      else {
 51        map<int, double> quarkmap;
 52        for ( const Particle& p : iqf.particles()) {
 53          if (quarkmap[p.pid()] < p.E()) {
 54            quarkmap[p.pid()] = p.E();
 55          }
 56        }
 57        double maxenergy = 0.;
 58        for (int i = 1; i <= 5; ++i) {
 59          if (quarkmap[i]+quarkmap[-i] > maxenergy) {
 60            flavour = i;
 61          }
 62        }
 63      }
 64      const size_t numParticles = cfs.particles().size();
 65      switch (flavour) {
 66      case 1: case 2: case 3:
 67	_weightLight->fill();  ;
 68        _cLight->fill(numParticles);
 69        break;
 70      case 5:
 71        _weightBottom->fill();
 72        _cBottom->fill(numParticles);
 73        break;
 74      }
 75
 76    }
 77
 78
 79    /// Normalise histograms etc., after the run
 80    void finalize() {
 81      // calculate the averages and diffs
 82      if(_weightLight ->effNumEntries()!=0) scale( _cLight, 1./ *_weightLight);
 83      if(_weightBottom->effNumEntries()!=0) scale(_cBottom, 1./ *_weightBottom);
 84      Counter _cDiff = *_cBottom - *_cLight;
 85      // fill the histograms
 86      for(unsigned int ix=1;ix<4;++ix) {
 87	double val(0.), err(0.0);
 88	if(ix==1) {
 89	  val = _cBottom->val();
 90	  err = _cBottom->err();
 91	}
 92	else if(ix==2) {
 93	  val = _cLight->val();
 94	  err = _cLight->err();
 95	}
 96	else if(ix==3) {
 97	  val = _cDiff.val();
 98	  err = _cDiff.err();
 99	}
100	Scatter2D temphisto(refData(1, 1, ix));
101	Scatter2DPtr mult;
102	book(mult,1, 1, ix);
103	for (size_t b = 0; b < temphisto.numPoints(); b++) {
104	  const double x  = temphisto.point(b).x();
105	  pair<double,double> ex = temphisto.point(b).xErrs();
106	  pair<double,double> ex2 = ex;
107	  if(ex2.first ==0.) ex2. first=0.0001;
108	  if(ex2.second==0.) ex2.second=0.0001;
109	  if (inRange(sqrtS()/GeV, x-ex2.first, x+ex2.second)) {
110	    mult->addPoint(x, val, ex, make_pair(err,err));
111	  }
112	  else {
113	    mult->addPoint(x, 0., ex, make_pair(0.,.0));
114	  }
115	}
116      }
117
118    }
119
120    //@}
121
122    /// @name Multiplicities
123    //@{
124    CounterPtr _cLight;
125    CounterPtr _cCharm;
126    CounterPtr _cBottom;
127    //@}
128
129    /// @name Weights
130    //@{
131    CounterPtr _weightLight;
132    CounterPtr _weightBottom;
133    //@}
134
135  };
136
137
138  // The hook for the plugin system
139  RIVET_DECLARE_PLUGIN(VENUS_1998_I453613);
140
141
142}