rivet is hosted by Hepforge, IPPP Durham

Rivet analyses reference

DELPHI_1998_I473409

Flavour seperated spectra for $\pi^\pm$, $K^\pm$, $p,\bar{p}$ production in hadronic $Z^0$ decays
Experiment: DELPHI (LEP)
Inspire ID: 473409
Status: VALIDATED
Authors:
  • Peter Richardson
References:
  • Nucl.Phys. B444 (1995) 3-26, 1995
Beams: e+ e-
Beam energies: (45.6, 45.6) GeV
Run details:
  • Hadronic Z decay events generated on the Z pole ($\sqrt{s} = 91.2$ GeV)

DELPHI results for the spectra \pi^\pm$, $K^\pm$, $p,\bar{p}$ production in hadronic $Z^0$ decays. The results are separated in light and bottom quark initiated events.

Source code: DELPHI_1998_I473409.cc
  1
  2
  3
  4
  5
  6
  7
  8
  9
 10
 11
 12
 13
 14
 15
 16
 17
 18
 19
 20
 21
 22
 23
 24
 25
 26
 27
 28
 29
 30
 31
 32
 33
 34
 35
 36
 37
 38
 39
 40
 41
 42
 43
 44
 45
 46
 47
 48
 49
 50
 51
 52
 53
 54
 55
 56
 57
 58
 59
 60
 61
 62
 63
 64
 65
 66
 67
 68
 69
 70
 71
 72
 73
 74
 75
 76
 77
 78
 79
 80
 81
 82
 83
 84
 85
 86
 87
 88
 89
 90
 91
 92
 93
 94
 95
 96
 97
 98
 99
100
101
102
103
104
105
106
107
108
109
110
111
112
113
114
115
116
117
118
119
120
121
122
123
124
125
126
127
128
129
130
131
132
133
134
135
136
137
138
139
140
141
142
143
144
145
146
147
148
149
150
151
152
153
154
155
156
157
158
159
160
161
162
163
164
165
166
167
168
169
170
171
172
173
174
175
176
177
178
179
180
181
182
183
184
185
186
187
188
189
190
191
192
193
194
195
196
197
198
199
200
201
202
203
204
205
206
207
208
209
210
211
212
213
214
215
216
217
218
219
220
221
222
223
224
225
226
227
228
229
230
231
232
233
234
235
236
237
238
239
240
241
242
243
244
245
246
247
248
249
250
251
252
253
254
255
256
257
258
259
260
261
262
263
264
265
266
267
268
269
270
271
272
273
274
275
276
277
278
279
280
281
282
283
284
285
286
287
288
289
290
291
292
293
294
295
296
297
298
299
300
301
302
303
304
305
306
307
308
309
310
311
312
313
314
315
316
317
318
319
320
321
322
323
324
325
326
327
328
329
330
331
332
333
334
335
336
337
338
339
340
// -*- C++ -*-
#include "Rivet/Analysis.hh"
#include "Rivet/Projections/Beam.hh"
#include "Rivet/Projections/FinalState.hh"
#include "Rivet/Projections/ChargedFinalState.hh"

#define I_KNOW_THE_INITIAL_QUARKS_PROJECTION_IS_DODGY_BUT_NEED_TO_USE_IT
#include "Rivet/Projections/InitialQuarks.hh"

namespace Rivet {


  /// @brief flavour seperate pi,K,p spectra
  class DELPHI_1998_I473409 : public Analysis {
  public:

    /// Constructor
    DEFAULT_RIVET_ANALYSIS_CTOR(DELPHI_1998_I473409);


    /// @name Analysis methods
    //@{

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

      // Initialise and register projections
      declare(Beam(), "Beams");
      declare(ChargedFinalState(), "FS");
      declare(InitialQuarks(), "IQF"); 
      // Book histograms
      book(_h_all_pi, "TMP/h_all_pi",refData( 4,1,1));
      book(_h_all_K , "TMP/h_all_K ",refData( 5,1,1));
      book(_h_all_p , "TMP/h_all_p ",refData( 6,1,1));
      book(_h_all_Kp, "TMP/h_all_Kp",refData( 7,1,1));
      book(_d_all   , "TMP/d_all   ",refData( 4,1,1));
      			           
      book(_h_bot_pi, "TMP/h_bot_pi",refData( 8,1,1));
      book(_h_bot_K , "TMP/h_bot_K ",refData( 9,1,1));
      book(_h_bot_p , "TMP/h_bot_p ",refData(10,1,1));
      book(_h_bot_Kp, "TMP/h_bot_Kp",refData(11,1,1));
      book(_d_bot   , "TMP/d_bot   ",refData( 8,1,1));
      			           
      book(_h_lgt_pi, "TMP/h_lgt_pi",refData(12,1,1));
      book(_h_lgt_K , "TMP/h_lgt_K ",refData(13,1,1));
      book(_h_lgt_p , "TMP/h_lgt_p ",refData(14,1,1));
      book(_h_lgt_Kp, "TMP/h_lgt_Kp",refData(15,1,1));
      book(_d_lgt   , "TMP/d_lgt   ",refData(12,1,1));

      book(_h_all_ch_p, 16,1,1);
      book(_h_all_ch_x, 17,1,1);
      book(_h_all_pi_p, 18,1,1);
      book(_h_all_pi_x, 19,1,1);
      book(_h_all_K_p , 20,1,1);
      book(_h_all_k_x , 21,1,1);
      book(_h_all_p_p , 22,1,1);
      book(_h_all_p_x , 23,1,1);
           
      book(_h_bot_ch_p, 24,1,1);
      book(_h_bot_ch_x, 25,1,1);
      book(_h_bot_pi_p, 26,1,1);
      book(_h_bot_pi_x, 27,1,1);
      book(_h_bot_K_p , 28,1,1);
      book(_h_bot_k_x , 29,1,1);
      book(_h_bot_p_p , 30,1,1);
      book(_h_bot_p_x , 31,1,1);
           
      book(_h_lgt_ch_p, 32,1,1);
      book(_h_lgt_ch_x, 33,1,1);
      book(_h_lgt_pi_p, 34,1,1);
      book(_h_lgt_pi_x, 35,1,1);
      book(_h_lgt_K_p , 36,1,1);
      book(_h_lgt_k_x , 37,1,1);
      book(_h_lgt_p_p , 38,1,1);
      book(_h_lgt_p_x , 39,1,1);

      for(unsigned int ix=0;ix<3;++ix) {
	for(unsigned int iy=0;iy<5;++iy) {
	  std::ostringstream title;
	  title << "/TMP/MULT_" << ix << "_" << iy;
	  book(_mult[ix][iy],title.str());
	}
      }
      book(_wLgt,"TMP/wLgt");
      book(_wBot,"TMP/wBot");
      book(_wAll,"TMP/wAll"); 
    }


    /// Perform the per-event analysis
    void analyze(const Event& event) {

      // First, veto on leptonic events by requiring at least 4 charged FS particles
      const FinalState& fs = apply<ChargedFinalState>(event, "FS");
      const size_t numParticles = fs.particles().size();

      // Even if we only generate hadronic events, we still need a cut on numCharged >= 2.
      if (numParticles < 2) {
        MSG_DEBUG("Failed leptonic event cut");
        vetoEvent;
      }
      MSG_DEBUG("Passed leptonic event cut");


      int flavour = 0;
      const InitialQuarks& iqf = apply<InitialQuarks>(event, "IQF");

      // If we only have two quarks (qqbar), just take the flavour.
      // If we have more than two quarks, look for the highest energetic q-qbar pair.
      if (iqf.particles().size() == 2) {
        flavour = iqf.particles().front().abspid();
      }
      else {
        map<int, double> quarkmap;
        for (const Particle& p : iqf.particles()) {
          if (quarkmap[p.pid()] < p.E()) {
            quarkmap[p.pid()] = p.E();
          }
        }
        double maxenergy = 0.;
        for (int i = 1; i <= 5; ++i) {
          if (quarkmap[i]+quarkmap[-i] > maxenergy) {
           flavour = i;
          }
        }
      }

      // Get event weight for histo filling
      _wAll->fill();
      if(flavour<=3)      _wLgt->fill();
      else if(flavour==5) _wBot->fill();

      // Get beams and average beam momentum
      const ParticlePair& beams = apply<Beam>(event, "Beams").beams();
      const double meanBeamMom = ( beams.first.p3().mod() +
                                   beams.second.p3().mod() ) / 2.0;
      MSG_DEBUG("Avg beam momentum = " << meanBeamMom);
      // loop over the charged particles
      for (const Particle& p : fs.particles()) {
	double modp = p.p3().mod();
        double xp = modp/meanBeamMom;
	int id = abs(p.pid());
	_d_all->fill(modp);
	_mult[0][0]->fill();
	_h_all_ch_p->fill(modp);
	_h_all_ch_x->fill(xp  );
	if(flavour<=3) {
	  _d_lgt->fill(modp);
	  _mult[2][0]->fill();
	  _h_lgt_ch_p->fill(modp);
	  _h_lgt_ch_x->fill(xp  );
	}
	else if(flavour==5) {
	  _d_bot  ->fill(modp);
	  _mult[1][0]->fill();
	  _h_bot_ch_p->fill(modp);
	  _h_bot_ch_x->fill(xp  );
	}
	if(id==211) {
	  _h_all_pi ->fill(modp);
	  _mult[0][1]->fill();
	  _h_all_pi_p->fill(modp);
	  _h_all_pi_x->fill(xp  );
	  if(flavour<=3) {
	    _h_lgt_pi ->fill(modp); 
	    _mult[2][1]->fill();
	    _h_lgt_pi_p->fill(modp);
	    _h_lgt_pi_x->fill(xp  );
	  }
	  else if(flavour==5) {
	    _h_bot_pi ->fill(modp);
	    _mult[1][1]->fill();
	    _h_bot_pi_p->fill(modp);
	    _h_bot_pi_x->fill(xp  );
	  }
	}
	else if(id==321) {
	  _h_all_K ->fill(modp);
	  _h_all_Kp->fill(modp);
	  _mult[0][2]->fill();
	  _mult[0][4]->fill();
	  _h_all_K_p ->fill(modp);
	  _h_all_k_x ->fill(xp  );
	  if(flavour<=3) {
	    _h_lgt_K->fill(modp);
	    _h_lgt_Kp->fill(modp);
	    _mult[2][2]->fill();
	    _mult[2][4]->fill();
	    _h_lgt_K_p ->fill(modp);
	    _h_lgt_k_x ->fill(xp  );
	  }
	  else if(flavour==5) {
	    _h_bot_K ->fill(modp);
	    _h_bot_Kp->fill(modp);
	    _mult[1][2]->fill();
	    _mult[1][4]->fill();
	    _h_bot_K_p ->fill(modp);
	    _h_bot_k_x ->fill(xp  );
	  }
	}
	else if(id==2212) {
	  _h_all_p ->fill(modp);
	  _h_all_Kp->fill(modp);
	  _mult[0][3]->fill();
	  _mult[0][4]->fill();
	  _h_all_p_p ->fill(modp);
	  _h_all_p_x ->fill(xp  );
	  if(flavour<=3) {
	    _h_lgt_p ->fill(modp);
	    _h_lgt_Kp->fill(modp);
	    _mult[2][3]->fill();
	    _mult[2][4]->fill();
	    _h_lgt_p_p ->fill(modp);
	    _h_lgt_p_x ->fill(xp  );
	  }
	  else if(flavour==5) {
	    _h_bot_p ->fill(modp);
	    _h_bot_Kp->fill(modp); 
	    _mult[1][3]->fill();
	    _mult[1][4]->fill();
	    _h_bot_p_p ->fill(modp);
	    _h_bot_p_x ->fill(xp  );
	  }
	}
      }
    }


    /// Normalise histograms etc., after the run
    void finalize() {


      // // Book histograms
      scale(_h_all_pi,100.);
      scale(_h_all_K ,100.);
      scale(_h_all_p ,100.);
      scale(_h_all_Kp,100.);
      Scatter2DPtr temp;
      book(temp,4,1,1);
      divide(_h_all_pi, _d_all, temp);
      book(temp,5,1,1);
      divide(_h_all_K , _d_all, temp);
      book(temp,6,1,1);
      divide(_h_all_p , _d_all, temp);
      book(temp,7,1,1);
      divide(_h_all_Kp, _d_all, temp);
      
      scale(_h_bot_pi,100.);
      scale(_h_bot_K ,100.);
      scale(_h_bot_p ,100.);
      scale(_h_bot_Kp,100.);
      book(temp, 8,1,1);
      divide(_h_bot_pi, _d_bot, temp);
      book(temp, 9,1,1);
      divide(_h_bot_K , _d_bot, temp);
      book(temp,10,1,1);
      divide(_h_bot_p , _d_bot, temp);
      book(temp,11,1,1);
      divide(_h_bot_Kp, _d_bot, temp);
      
      scale(_h_lgt_pi,100.);
      scale(_h_lgt_K ,100.);
      scale(_h_lgt_p ,100.);
      scale(_h_lgt_Kp,100.);
      book(temp,12,1,1);
      divide(_h_lgt_pi, _d_lgt, temp);
      book(temp,13,1,1);
      divide(_h_lgt_K , _d_lgt, temp);
      book(temp,14,1,1);
      divide(_h_lgt_p , _d_lgt, temp);
      book(temp,15,1,1);
      divide(_h_lgt_Kp, _d_lgt, temp);

      scale(_h_all_ch_p, 1./ *_wAll);
      scale(_h_all_ch_x, 1./ *_wAll);
      scale(_h_all_pi_p, 1./ *_wAll);
      scale(_h_all_pi_x, 1./ *_wAll);
      scale(_h_all_K_p , 1./ *_wAll);
      scale(_h_all_k_x , 1./ *_wAll);
      scale(_h_all_p_p , 1./ *_wAll);
      scale(_h_all_p_x , 1./ *_wAll);

      scale(_h_bot_ch_p, 1./ *_wBot);
      scale(_h_bot_ch_x, 1./ *_wBot);
      scale(_h_bot_pi_p, 1./ *_wBot);
      scale(_h_bot_pi_x, 1./ *_wBot);
      scale(_h_bot_K_p , 1./ *_wBot);
      scale(_h_bot_k_x , 1./ *_wBot);
      scale(_h_bot_p_p , 1./ *_wBot);
      scale(_h_bot_p_x , 1./ *_wBot);

      scale(_h_lgt_ch_p, 1./ *_wLgt);
      scale(_h_lgt_ch_x, 1./ *_wLgt);
      scale(_h_lgt_pi_p, 1./ *_wLgt);
      scale(_h_lgt_pi_x, 1./ *_wLgt);
      scale(_h_lgt_K_p , 1./ *_wLgt);
      scale(_h_lgt_k_x , 1./ *_wLgt);
      scale(_h_lgt_p_p , 1./ *_wLgt);
      scale(_h_lgt_p_x , 1./ *_wLgt);

      // multiplicities
      vector<CounterPtr> scales = {_wAll,_wBot,_wLgt};
      for(unsigned int ix=0;ix<3;++ix) {
	if(scales[ix]->effNumEntries()<=0.) continue;
	for(unsigned int iy=0;iy<5;++iy) {
	  Scatter2DPtr scatter;
	  book(scatter, ix+1, 1, iy+1, true);
	  scale(_mult[ix][iy],1./ *scales[ix]);
	  scatter->point(0).setY(_mult[ix][iy]->val(),_mult[ix][iy]->err());
	}
      }
    }

    //@}


    /// @name Histograms
    //@{
    Histo1DPtr _h_all_pi , _h_all_K  , _h_all_p  , _h_all_Kp , _d_all;
    Histo1DPtr _h_bot_pi , _h_bot_K  , _h_bot_p  , _h_bot_Kp , _d_bot;
    Histo1DPtr _h_lgt_pi , _h_lgt_K  , _h_lgt_p  , _h_lgt_Kp , _d_lgt;
    Histo1DPtr _h_all_ch_p, _h_all_ch_x , _h_all_pi_p , _h_all_pi_x ;
    Histo1DPtr _h_all_K_p , _h_all_k_x  , _h_all_p_p  , _h_all_p_x  ;
    Histo1DPtr _h_bot_ch_p , _h_bot_ch_x , _h_bot_pi_p , _h_bot_pi_x;
    Histo1DPtr _h_bot_K_p  , _h_bot_k_x  , _h_bot_p_p  , _h_bot_p_x ;
    Histo1DPtr _h_lgt_ch_p , _h_lgt_ch_x , _h_lgt_pi_p , _h_lgt_pi_x;
    Histo1DPtr _h_lgt_K_p  , _h_lgt_k_x  , _h_lgt_p_p  , _h_lgt_p_x ;
    CounterPtr _mult[3][5];

    CounterPtr _wLgt, _wBot, _wAll;
    //@}

  };


  // The hook for the plugin system
  DECLARE_RIVET_PLUGIN(DELPHI_1998_I473409);


}