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 Add a short analysis description here
 13  class DELPHI_1999_I448370 : public Analysis {
 14  public:
 15
 16    /// Constructor
 17    RIVET_DEFAULT_ANALYSIS_CTOR(DELPHI_1999_I448370);
 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(), "FS");
 27      declare(InitialQuarks(), "IQF");
 28
 29      // Book histograms
 30       book(_h_F_T       , 1, 1, 1);
 31       book(_h_F_L       , 2, 1, 1);
 32       book(_h_F_A       , 3, 1, 1);
 33       book(_h_F_TL      , 4, 1, 1);
 34       book(_h_F_T_total , 5, 1, 1);
 35       book(_h_F_L_total , 5, 1, 2);
 36       book(_h_F_TL_total, 5, 1, 3);
 37       book(_h_b_F_T     , 7, 1, 1);
 38       book(_h_b_F_L     , 7, 1, 2);
 39       book(_h_light_F_T , 8, 1, 1);
 40       book(_h_light_F_L , 8, 1, 2);
 41       book(_n_bottom    , 9, 1, 1);
 42       book(_n_light     , 9, 1, 2);
 43
 44       book(_c_light , "/TMP/wLight");
 45       book(_c_bottom, "/TMP/wBottom");
 46       book(_c_total , "/TMP/wTotal");
 47
 48    }
 49
 50
 51    /// Perform the per-event analysis
 52    void analyze(const Event& event) {
 53      // First, veto on leptonic events by requiring at least 4 charged FS particles
 54      const FinalState& fs = apply<FinalState>(event, "FS");
 55      const size_t numParticles = fs.particles().size();
 56
 57      // Even if we only generate hadronic events, we still need a cut on numCharged >= 2.
 58      if (numParticles < 2) {
 59        MSG_DEBUG("Failed leptonic event cut");
 60        vetoEvent;
 61      }
 62      MSG_DEBUG("Passed leptonic event cut");
 63
 64      int flavour = 0;
 65      const InitialQuarks& iqf = apply<InitialQuarks>(event, "IQF");
 66
 67      // If we only have two quarks (qqbar), just take the flavour.
 68      // If we have more than two quarks, look for the highest energetic q-qbar pair.
 69      if (iqf.particles().size() == 2) {
 70        flavour = iqf.particles().front().abspid();
 71      }
 72      else {
 73        map<int, double> quarkmap;
 74        for (const Particle& p : iqf.particles()) {
 75          if (quarkmap[p.pid()] < p.E()) {
 76            quarkmap[p.pid()] = p.E();
 77          }
 78        }
 79        double maxenergy = 0.;
 80        for (int i = 1; i <= 5; ++i) {
 81          if (quarkmap[i]+quarkmap[-i] > maxenergy) {
 82            flavour = i;
 83          }
 84        }
 85      }
 86      if     (flavour==5) _c_bottom->fill();
 87      else if(flavour!=4) _c_light ->fill();
 88      _c_total->fill();
 89      // Get beams and average beam momentum
 90      const ParticlePair& beams = apply<Beam>(event, "Beams").beams();
 91      const double meanBeamMom = ( beams.first.p3().mod() +
 92                                   beams.second.p3().mod() ) / 2.0;
 93      MSG_DEBUG("Avg beam momentum = " << meanBeamMom);
 94      Vector3 axis;
 95      if (beams.first.pid()>0) {
 96        axis = beams.first .momentum().p3().unit();
 97      }
 98      else {
 99        axis = beams.second.momentum().p3().unit();
100      }
101
102      // loop over charged particles
103      double v=0.8, v2=sqr(v), v5=v2*v2*v;
104      for (const Particle& p : fs.particles()) {
105        double xp = p.p3().mod()/meanBeamMom;
106        double ctheta = axis.dot(p.momentum().p3().unit());
107        if(abs(ctheta)<0.8) {
108          double WT = 0.5 /v5*(5.*sqr(ctheta)*(3.-v2)-v2*(5.-3.*v2));
109          double WL = 0.25/v5*(v2*(5.+3.*v2)-5.*sqr(ctheta)*(3.+v2));
110          double WA = 2.*ctheta/v2/v;
111          _h_F_T  ->fill(xp,WT);
112          _h_F_L  ->fill(xp,WL);
113          _h_F_TL ->fill(xp,(WL+WT));
114          _h_F_T_total ->fill(xp,0.5*xp*WT);
115          _h_F_L_total ->fill(xp,0.5*xp*WL);
116          _h_F_TL_total->fill(xp,0.5*xp*(WL+WT));
117          if(p.charge()>0) {
118            _h_F_A->fill(xp, WA);
119          }
120          else {
121            _h_F_A->fill(xp,-WA);
122          }
123          if(flavour==5) {
124            _h_b_F_T  ->fill(xp,WT);
125            _h_b_F_L  ->fill(xp,WL);
126          }
127          else if(flavour!=4) {
128            _h_light_F_T->fill(xp,WT);
129            _h_light_F_L->fill(xp,WL);
130          }
131        }
132      }
133
134      if(flavour==5) {
135        _n_bottom->fill(Ecm, fs.particles().size());
136      }
137      else if(flavour!=4) {
138        _n_light->fill(Ecm, fs.particles().size());
139      }
140
141    }
142
143
144    /// Normalise histograms etc., after the run
145    void finalize() {
146      scale(_h_F_T ,1./ *_c_total);
147      scale(_h_F_L ,1./ *_c_total);
148      scale(_h_F_A ,1./ *_c_total);
149      scale(_h_F_TL,1./ *_c_total);
150      {Estimate1DPtr temp; divide(_h_F_L, _h_F_T , book(temp, 6, 1, 1));}
151      {Estimate1DPtr temp; divide(_h_F_L, _h_F_TL, book(temp, 6, 1, 2));}
152      scale(_h_F_T_total ,1./ *_c_total);
153      scale(_h_F_L_total ,1./ *_c_total);
154      scale(_h_F_TL_total,1./ *_c_total);
155      scale(_h_b_F_T ,1./ *_c_bottom);
156      scale(_h_b_F_L ,1./ *_c_bottom);
157      scale(_h_light_F_T ,1./ *_c_light);
158      scale(_h_light_F_L ,1./ *_c_light);
159      scale(_n_bottom ,1./ *_c_bottom);
160      scale(_n_light ,1./ *_c_light);
161    }
162
163    /// @}
164
165
166    /// @name Histograms
167    /// @{
168    Histo1DPtr _h_F_T,_h_F_L,_h_F_A,_h_F_TL,_h_b_F_T,_h_b_F_L,_h_light_F_T,_h_light_F_L;
169    Histo1DPtr _h_F_T_total,_h_F_L_total,_h_F_TL_total;
170    BinnedHistoPtr<string> _n_light,_n_bottom;
171    CounterPtr _c_light,_c_bottom,_c_total;
172    const string Ecm = "91.2";
173    /// @}
174
175
176  };
177
178
179  RIVET_DECLARE_PLUGIN(DELPHI_1999_I448370);
180
181
182}