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19 // Class to create the coktail for physics with muons for pp collisions
20 // using the The followoing sources:
21 // jpsi, psiP, upsilon, upsilonP, upsilonPP, open charm and open beauty
22 // The free parameeters are :
23 // pp reaction cross-section
24 // production cross-sections in pp collisions
25 // July 07:added heavy quark production from AliGenCorrHF and heavy quark
26 // production switched off in Pythia
27 // Aug. 07: added trigger cut on total momentum
28 // 2009: added possibility to hide x-sections (B. Vulpescu)
29 // 2009: added possibility to have the cocktail (fast generator and param.)
30 // for pp @ 10 TeV or pp @ 14 TeV (N. Bastid)
32 // 2009: added polarization (L. Bianchi)
34 // 11/2009: added chi_c1 & chi_c2 (P.Crochet & N.Bastid).
35 // Cross-sections for charmonia are now directly taken from the Yellow Report
36 // (hep-ph/0311048) Tab.9, page 19. See below for details w.r.t. beam energy.
37 // usage: see example of Config in $ALICE_ROOT/prod/LHC09a10/Config.C
38 //------------------------
40 // - CMS energy passed via parameter
41 // i.e. gener->SetCMSEnergy(AliGenMUONCocktailpp::kCMS07TeV) in Config.C
42 // - resonances now added to the cocktail via AddReso2Generator
44 // B.Vulpescu & P.Crochet
45 //-----------------------
47 // - added the cocktail for p-Pb & Pb-p @ 8.8 TeV with 4 centrality bins and
48 // for Pb-Pb @ 2.76 TeV with 11 centrality bins. Bins should be defined also
49 // in the Config.C with one AliGenMUONCocktailpp per bin. These generators
50 // included in a AliGenCocktail together with an event generator (e.g. Hijing)
51 // providing the underlying event and collision centrality. The bin number n
52 // passed via AliGenMUONCocktailpp::SetCentralityBin(n).
53 // See details in my presentation at the PWG3-Muon meeting (05.10.2011):
54 // https://indico.cern.ch/conferenceDisplay.py?confId=157367
55 // - simplifications and bug fix in CreateCocktail()
58 #include <TObjArray.h>
59 #include <TParticle.h>
61 #include <TVirtualMC.h>
62 #include "AliGenCocktailEventHeader.h"
64 #include "AliGenCocktailEntry.h"
65 #include "AliGenMUONCocktailpp.h"
66 #include "AliGenMUONlib.h"
67 #include "AliGenParam.h"
71 #include "AliDecayer.h"
73 #include "AliGenCorrHF.h"
74 #include "AliDecayerPolarized.h"
76 ClassImp(AliGenMUONCocktailpp)
78 //________________________________________________________________________
79 AliGenMUONCocktailpp::AliGenMUONCocktailpp()
82 fDecayModeResonance(kAll),
83 fDecayModePythia(kAll),
88 fMuonThetaMaxCut(180.),
89 fMuonOriginCut(-999.),
104 fCMSEnergyTeVArray(),
106 fSigmaReactionArray(),
116 fSigmaUpsilonArray(),
118 fSigmaUpsilonPArray(),
120 fSigmaUpsilonPPArray(),
130 // x-sections for pp @ 7 TeV:
131 // -charmonia: 4pi integral of fit function for inclusive J/psi dsigma/dy LHC data
132 // gives 60 mub; so sigma_prompt = 54 mub, while Ref = R.Vogt_arXiv:1003.3497 (Table 2)
133 // gives 35 mub. Below we use sigma_direct from the Ref scaled by the factor 54/35.
134 // -bottomonia: 4pi integral of fit function for inclusive Upsilon1S dsigma/dy LHC data
135 // gives 0.56 mub, sigmas for 2S & 3S obtained using CMS data for ratios 2S/1S & 3S/1S
136 // -ccbar & bbbar: NLO pQCD computations - http://www-alice.gsi.de/ana/MNR/results.html
137 fCMSEnergyTeVArray[0] = 7.00;
138 fSigmaReactionArray[0] = 0.070;
139 fSigmaJPsiArray[0] = 33.6e-6;
140 fSigmaChic1Array[0] = 32.6e-6;
141 fSigmaChic2Array[0] = 53.8e-6;
142 fSigmaPsiPArray[0] = 7.6e-6;
143 fSigmaUpsilonArray[0] = 0.56e-6;
144 fSigmaUpsilonPArray[0] = 0.19e-6;
145 fSigmaUpsilonPPArray[0] = 0.09e-6;
146 fSigmaCCbarArray[0] = 6.91e-3;
147 fSigmaBBbarArray[0] = 0.232e-3;
149 //x-sections for pp @ 10 TeV: charmonia and bottomonia from 14 TeV numbers
150 // scaled down according to ccbar and bbbar cross-sections
151 fCMSEnergyTeVArray[1] = 10.00;
152 fSigmaReactionArray[1] = 0.070;
153 fSigmaJPsiArray[1] = 26.06e-6;
154 fSigmaChic1Array[1] = 25.18e-6;
155 fSigmaChic2Array[1] = 41.58e-6;
156 fSigmaPsiPArray[1] = 5.88e-6;
157 fSigmaUpsilonArray[1] = 0.658e-6;
158 fSigmaUpsilonPArray[1] = 0.218e-6;
159 fSigmaUpsilonPPArray[1] = 0.122e-6;
160 fSigmaCCbarArray[1] = 8.9e-3;
161 fSigmaBBbarArray[1] = 0.33e-3;
163 //x-sections for pp @ 14 TeV: charmonia from hep-ph/0311048 Tab.9, page 19,
164 // bottomonium from hep-ph/0311048 Tab.9, page 19 taken into account that
165 // feed-down from chib is included
166 fCMSEnergyTeVArray[2] = 14.00;
167 fSigmaReactionArray[2] = 0.070;
168 fSigmaJPsiArray[2] = 32.9e-6;
169 fSigmaChic1Array[2] = 31.8e-6;
170 fSigmaChic2Array[2] = 52.5e-6;
171 fSigmaPsiPArray[2] = 7.43e-6;
172 fSigmaUpsilonArray[2] = 0.989e-6;
173 fSigmaUpsilonPArray[2] = 0.502e-6;
174 fSigmaUpsilonPPArray[2] = 0.228e-6;
175 fSigmaCCbarArray[2] = 11.2e-3;
176 fSigmaBBbarArray[2] = 0.445e-3;
178 // x-sections for Min. Bias p-Pb & Pb-p @ 8.8 TeV: charmonia and bottomonia
179 // from 7 TeV numbers scaled according to pQCD ccbar and bbbar x-sections
180 // and with Glauber scaling
181 fCMSEnergyTeVArray[3] = 9.00; // for 8.8 TeV
182 fSigmaReactionArray[3] = 2.10;
183 fSigmaJPsiArray[3] = 8.19e-3; // 208*1.172*33.6e-6
184 fSigmaChic1Array[3] = 7.95e-3;
185 fSigmaChic2Array[3] = 13.1e-3;
186 fSigmaPsiPArray[3] = 1.85e-3;
187 fSigmaUpsilonArray[3] = 0.146e-3; // 208*1.25*0.56e-6
188 fSigmaUpsilonPArray[3] = 0.049e-3;
189 fSigmaUpsilonPPArray[3] = 0.023e-3;
190 fSigmaCCbarArray[3] = 1.68; // 208*8.1e-3
191 fSigmaBBbarArray[3] = 0.061; // 208*0.29e-3
193 fCMSEnergyTeVArray[4] = -fCMSEnergyTeVArray[3];
194 fSigmaReactionArray[4] = fSigmaReactionArray[3];
195 fSigmaJPsiArray[4] = fSigmaJPsiArray[3];
196 fSigmaChic1Array[4] = fSigmaChic1Array[3];
197 fSigmaChic2Array[4] = fSigmaChic2Array[3];
198 fSigmaPsiPArray[4] = fSigmaPsiPArray[3];
199 fSigmaUpsilonArray[4] = fSigmaUpsilonArray[3];
200 fSigmaUpsilonPArray[4] = fSigmaUpsilonPArray[3];
201 fSigmaUpsilonPPArray[4] = fSigmaUpsilonPPArray[3];
202 fSigmaCCbarArray[4] = fSigmaCCbarArray[3];
203 fSigmaBBbarArray[4] = fSigmaBBbarArray[3];
205 // x-sections for Min. Bias Pb-Pb @ 2.76 TeV: charmonia and bottomonia
206 // from 7 TeV numbers scaled according to pQCD ccbar and bbbar x-sections
207 // and with Glauber scaling
208 fCMSEnergyTeVArray[5] = 3.00; // for 2.76 TeV
209 fSigmaReactionArray[5] = 7.65;
210 fSigmaJPsiArray[5] = 0.734; // 208*208*0.505*33.6e-6
211 fSigmaChic1Array[5] = 0.712;
212 fSigmaChic2Array[5] = 1.175;
213 fSigmaPsiPArray[5] = 0.166;
214 fSigmaUpsilonArray[5] = 0.0092; // 208*208*0.379*0.56e-6
215 fSigmaUpsilonPArray[5] = 0.0031;
216 fSigmaUpsilonPPArray[5] = 0.0015;
217 fSigmaCCbarArray[5] = 151.; // 208*208*3.49e-3
218 fSigmaBBbarArray[5] = 3.8; // 208*208*0.088e-3
222 //_________________________________________________________________________
223 AliGenMUONCocktailpp::~AliGenMUONCocktailpp()
229 //_________________________________________________________________________
230 void AliGenMUONCocktailpp::SetCMSEnergy(CMSEnergyCode cmsEnergy)
232 // setter for CMSEnergy and corresponding cross-sections
233 fCMSEnergyTeV = fCMSEnergyTeVArray[cmsEnergy];
234 fSigmaReaction = fSigmaReactionArray[cmsEnergy];
235 fSigmaJPsi = fSigmaJPsiArray[cmsEnergy];
236 fSigmaChic1 = fSigmaChic1Array[cmsEnergy];
237 fSigmaChic2 = fSigmaChic2Array[cmsEnergy];
238 fSigmaPsiP = fSigmaPsiPArray[cmsEnergy];
239 fSigmaUpsilon = fSigmaUpsilonArray[cmsEnergy];
240 fSigmaUpsilonP = fSigmaUpsilonPArray[cmsEnergy];
241 fSigmaUpsilonPP = fSigmaUpsilonPPArray[cmsEnergy];
242 fSigmaCCbar = fSigmaCCbarArray[cmsEnergy];
243 fSigmaBBbar = fSigmaBBbarArray[cmsEnergy];
246 //_________________________________________________________________________
247 void AliGenMUONCocktailpp::SetResPolarization(Double_t JpsiPol, Double_t PsiPPol, Double_t UpsPol,
248 Double_t UpsPPol, Double_t UpsPPPol, char *PolFrame){
249 // setter for resonances polarization
250 if (strcmp(PolFrame,"kColSop")==0){
251 fJpsiPol = (JpsiPol>=-1 && JpsiPol<=1) ? JpsiPol : 0;
252 fPsiPPol = (PsiPPol>=-1 && PsiPPol<=1) ? PsiPPol : 0;
253 fUpsPol = (UpsPol>=-1 && UpsPol<=1) ? UpsPol : 0;
254 fUpsPPol = (UpsPPol>=-1 && UpsPPol<=1) ? UpsPPol : 0;
255 fUpsPPPol = (UpsPPPol>=-1 && UpsPPPol<=1) ? UpsPPPol : 0;
257 } else if (strcmp(PolFrame,"kHelicity")==0){
258 fJpsiPol = (JpsiPol>=-1 && JpsiPol<=1) ? JpsiPol : 0;
259 fPsiPPol = (PsiPPol>=-1 && PsiPPol<=1) ? PsiPPol : 0;
260 fUpsPol = (UpsPol>=-1 && UpsPol<=1) ? UpsPol : 0;
261 fUpsPPol = (UpsPPol>=-1 && UpsPPol<=1) ? UpsPPol : 0;
262 fUpsPPPol = (UpsPPPol>=-1 && UpsPPPol<=1) ? UpsPPPol : 0;
266 AliInfo(Form("The polarization frame is not valid"));
267 AliInfo(Form("No polarization will be set"));
276 //_________________________________________________________________________
277 void AliGenMUONCocktailpp::CreateCocktail()
279 // create and add resonances and open HF to the coctail
280 Int_t cmsEnergy = Int_t(fCMSEnergyTeV);
282 // These limits are only used for renormalization of quarkonia cross section
283 // Pythia events are generated in 4pi
284 Double_t ptMin = fPtMin;
285 Double_t ptMax = fPtMax;
286 Double_t yMin = fYMin;;
287 Double_t yMax = fYMax;;
288 Double_t phiMin = fPhiMin*180./TMath::Pi();
289 Double_t phiMax = fPhiMax*180./TMath::Pi();
290 AliInfo(Form("Ranges pT:%4.1f : %4.1f GeV/c, y:%4.2f : %4.2f, Phi:%5.1f : %5.1f degres",ptMin,ptMax,yMin,yMax,phiMin,phiMax));
292 // Cross sections in barns (from PPR Vol. II p: 552) pp - 14 TeV and
293 // corrected from feed down of higher resonances
295 Double_t sigmajpsi = fSigmaJPsi;
296 Double_t sigmachic1 = fSigmaChic1;
297 Double_t sigmachic2 = fSigmaChic2;
298 Double_t sigmapsiP = fSigmaPsiP;
299 Double_t sigmaupsilon = fSigmaUpsilon;
300 Double_t sigmaupsilonP = fSigmaUpsilonP;
301 Double_t sigmaupsilonPP = fSigmaUpsilonPP;
302 Double_t sigmaccbar = fSigmaCCbar;
303 Double_t sigmabbbar = fSigmaBBbar;
305 // Cross sections corrected with the BR in mu+mu-
306 // (only in case of use of AliDecayerPolarized)
308 if(TMath::Abs(fJpsiPol) > 1.e-30) {sigmajpsi = fSigmaJPsi*0.0593;}
309 if(TMath::Abs(fChic1Pol) > 1.e-30) {sigmachic1 = fSigmaChic1*0.;} // tb consistent
310 if(TMath::Abs(fChic2Pol) > 1.e-30) {sigmachic2 = fSigmaChic2*0.;} // tb consistent
311 if(TMath::Abs(fPsiPPol) > 1.e-30) {sigmapsiP = fSigmaPsiP*0.0075;}
312 if(TMath::Abs(fUpsPol) > 1.e-30) {sigmaupsilon = fSigmaUpsilon*0.0248;}
313 if(TMath::Abs(fUpsPPol) > 1.e-30) {sigmaupsilonP = fSigmaUpsilonP*0.0193;}
314 if(TMath::Abs(fUpsPPPol) > 1.e-30) {sigmaupsilonPP = fSigmaUpsilonPP*0.0218;}
316 AliInfo(Form("the parametrised resonances uses the decay mode %d",fDecayModeResonance));
318 // Create and add resonances to the generator
319 AliGenParam * genjpsi=0;
320 AliGenParam * genchic1=0;
321 AliGenParam * genchic2=0;
322 AliGenParam * genpsiP=0;
323 AliGenParam * genupsilon=0;
324 AliGenParam * genupsilonP=0;
325 AliGenParam * genupsilonPP=0;
328 Char_t nameChic1[10];
329 Char_t nameChic2[10];
333 Char_t nameUpsPP[10];
335 snprintf(nameJpsi,10, "Jpsi");
336 snprintf(nameChic1,10, "Chic1");
337 snprintf(nameChic2,10, "Chic2");
338 snprintf(namePsiP,10, "PsiP");
339 snprintf(nameUps,10, "Ups");
340 snprintf(nameUpsP,10, "UpsP");
341 snprintf(nameUpsPP,10, "UpsPP");
343 Char_t tname[40] = "";
344 if(cmsEnergy == 10) {snprintf(tname, 40, "CDF pp 10");
345 } else if (cmsEnergy == 14){snprintf(tname, 40, "CDF pp");
346 } else if (cmsEnergy == 7) {snprintf(tname, 40, "pp 7");
347 // } else if (cmsEnergy == 2) {snprintf(tname, 40, "pp 2.76");
348 } else if (cmsEnergy == 9) {snprintf(tname, 40, "pPb 8.8");
349 if (fCentralityBin > 0) snprintf(tname, 40, "pPb 8.8c%d",fCentralityBin);
350 } else if (cmsEnergy == -9){snprintf(tname, 40, "Pbp 8.8");
351 if (fCentralityBin > 0) snprintf(tname, 40, "Pbp 8.8c%d",fCentralityBin);
352 } else if (cmsEnergy == 3) {snprintf(tname, 40, "PbPb 2.76");
353 if (fCentralityBin > 0) snprintf(tname, 40, "PbPb 2.76c%d",fCentralityBin);
355 AliError("Initialisation failed, wrong cmsEnergy");
358 genjpsi = new AliGenParam(1, AliGenMUONlib::kJpsi, tname, "Jpsi");
359 genchic1 = new AliGenParam(1, AliGenMUONlib::kChic1, tname, "Chic1");
360 genchic2 = new AliGenParam(1, AliGenMUONlib::kChic2, tname, "Chic2");
361 genpsiP = new AliGenParam(1, AliGenMUONlib::kPsiP, tname, "PsiP");
362 genupsilon = new AliGenParam(1, AliGenMUONlib::kUpsilon, tname, "Upsilon");
363 genupsilonP = new AliGenParam(1, AliGenMUONlib::kUpsilonP, tname, "UpsilonP");
364 genupsilonPP = new AliGenParam(1, AliGenMUONlib::kUpsilonPP, tname, "UpsilonPP");
366 // Hard process yield per pA or AA collision for i-th centrality bin is R*r[i]*shad[i]
367 // where R is the ratio of hard and geometrical x-sections, r[i] is the ratio of these
368 // x-section fractions for given centrality and shad[i] is the shadowing factor (in 4pi).
369 // The latter is assumed to be the same for HF-hadrons & quarkonia of the same flavour.
371 Double_t chard[20] = {0}; // charm & beauty shadowing factors are different
372 Double_t bhard[20] = {0};
373 chard[0] = 1; // 1st element for pp and min. bias (MB) collisions
376 // 4 centrality bins for p-Pb & Pb-p: 0-20-40-60-100 %
377 if (cmsEnergy == 9 || cmsEnergy == -9) {
378 const Int_t n9 = 5; // 1st element for MB collisions
379 Double_t r9[n9] = {1, 1.936, 1.473, 0.914, 0.333}; // ratio of hard-over-geo fractions
380 Double_t cshad9[n9] = {0.785, 0.715, 0.775, 0.856, 0.951};// EKS98 shadowing factors
381 Double_t bshad9[n9] = {0.889, 0.853, 0.884, 0.926, 0.975};
382 for(i=0; i<n9; i++) {
383 chard[i] = cshad9[i]*r9[i];
384 bhard[i] = bshad9[i]*r9[i];
388 // 11 centrality bins for Pb-Pb: 0-5-10-20-30-40-50-60-70-80-90-100 %
389 if (cmsEnergy == 3) {
390 const Int_t n3 = 12; // 1st element for MB collisions
391 Double_t r3[n3] = {1, 4.661, 3.647, 2.551, 1.544, 0.887, 0.474,
392 0.235, 0.106, 0.044, 0.017, 0.007}; // ratio of hard-over-geo fractions
393 Double_t cshad3[n3] = {0.662, 0.622, 0.631, 0.650, 0.681, 0.718,
394 0.760, 0.805, 0.849, 0.888, 0.918, 0.944};// EKS98 shadowing factors
395 Double_t bshad3[n3] = {0.874, 0.856, 0.861, 0.869, 0.883, 0.898,
396 0.915, 0.932, 0.948, 0.962, 0.972, 0.981};
397 for(i=0; i<n3; i++) {
398 chard[i] = cshad3[i]*r3[i];
399 bhard[i] = bshad3[i]*r3[i];
403 AddReso2Generator(nameJpsi,genjpsi,chard[fCentralityBin]*sigmajpsi,fJpsiPol);
404 AddReso2Generator(nameChic1,genchic1,chard[fCentralityBin]*sigmachic1,fChic1Pol);
405 AddReso2Generator(nameChic2,genchic2,chard[fCentralityBin]*sigmachic2,fChic2Pol);
406 AddReso2Generator(namePsiP,genpsiP,chard[fCentralityBin]*sigmapsiP,fPsiPPol);
408 AddReso2Generator(nameUps,genupsilon,bhard[fCentralityBin]*sigmaupsilon,fUpsPol);
409 AddReso2Generator(nameUpsP,genupsilonP,bhard[fCentralityBin]*sigmaupsilonP,fUpsPPol);
410 AddReso2Generator(nameUpsPP,genupsilonPP,bhard[fCentralityBin]*sigmaupsilonPP,fUpsPPPol);
412 //------------------------------------------------------------------
413 // Generator of charm
414 AliGenCorrHF *gencharm = new AliGenCorrHF(1, 4, cmsEnergy);
415 gencharm->SetMomentumRange(0,9999);
416 gencharm->SetForceDecay(kAll);
417 Double_t ratioccbar = chard[fCentralityBin]*sigmaccbar/fSigmaReaction;
418 if (!gMC) gencharm->SetDecayer(fDecayer);
421 AliInfo(Form("c-cbar prod. cross-section in pp %5.3g b",sigmaccbar));
422 AliInfo(Form("c-cbar prod. probability per collision in acceptance %5.3g",ratioccbar));
424 AddGenerator(gencharm,"CorrHFCharm",ratioccbar);
425 //------------------------------------------------------------------
426 // Generator of beauty
427 AliGenCorrHF *genbeauty = new AliGenCorrHF(1, 5, cmsEnergy);
428 genbeauty->SetMomentumRange(0,9999);
429 genbeauty->SetForceDecay(kAll);
430 Double_t ratiobbbar = bhard[fCentralityBin]*sigmabbbar/fSigmaReaction;
431 if (!gMC) genbeauty->SetDecayer(fDecayer);
434 AliInfo(Form("b-bbar prod. cross-section in pp %5.3g b",sigmabbbar));
435 AliInfo(Form("b-bbar prod. probability per collision in acceptance %5.3g",ratiobbbar));
437 AddGenerator(genbeauty,"CorrHFBeauty",ratiobbbar);
439 //-------------------------------------------------------------------
442 // This has to go into the Config.C
444 // AliGenPythia *pythia = new AliGenPythia(1);
445 // pythia->SetProcess(kPyMbMSEL1);
446 // pythia->SetStrucFunc(kCTEQ5L);
447 // pythia->SetEnergyCMS(14000.);
448 // AliInfo(Form("\n\npythia uses the decay mode %d", GetDecayModePythia()));
449 // Decay_t dt = gener->GetDecayModePythia();
450 // pythia->SetForceDecay(dt);
451 // pythia->SetPtRange(0.,100.);
452 // pythia->SetYRange(-8.,8.);
453 // pythia->SetPhiRange(0.,360.);
454 // pythia->SetPtHard(2.76,-1.0);
455 // pythia->SwitchHFOff();
457 // AddGenerator(pythia,"Pythia",1);
461 //-------------------------------------------------------------------
462 void AliGenMUONCocktailpp::AddReso2Generator(Char_t* nameReso,
463 AliGenParam* const genReso,
467 // add resonances to the cocktail
468 Double_t phiMin = fPhiMin*180./TMath::Pi();
469 Double_t phiMax = fPhiMax*180./TMath::Pi();
471 // first step: generation in 4pi
472 genReso->SetPtRange(0.,100.);
473 genReso->SetYRange(-8.,8.);
474 genReso->SetPhiRange(0.,360.);
475 genReso->SetForceDecay(fDecayModeResonance);
476 if (!gMC) genReso->SetDecayer(fDecayer);
477 genReso->Init(); // generation in 4pi
478 // Ratios with respect to the reaction cross-section in the
479 // kinematics limit of the MUONCocktail
480 Double_t ratioReso = sigmaReso / fSigmaReaction * genReso->GetRelativeArea(fPtMin,fPtMax,fYMin,fYMax,phiMin,phiMax);
482 AliInfo(Form("%s prod. cross-section in pp %5.3g b",nameReso,sigmaReso));
483 AliInfo(Form("%s prod. probability per collision in acceptance %5.3g",nameReso,ratioReso));
485 // second step: generation in selected kinematical range
486 genReso->SetPtRange(fPtMin, fPtMax);
487 genReso->SetYRange(fYMin, fYMax);
488 genReso->SetPhiRange(phiMin, phiMax);
489 genReso->Init(); // generation in selected kinematical range
491 TVirtualMCDecayer *decReso = 0;
492 if(TMath::Abs(polReso) > 1.e-30){
493 AliInfo(Form("******Setting polarized decayer for %s''",nameReso));
495 decReso = new AliDecayerPolarized(polReso,AliDecayerPolarized::kColSop,AliDecayerPolarized::kMuon);
496 AliInfo(Form("******Reference frame: %s, alpha: %f","Collins-Soper",polReso));
499 decReso = new AliDecayerPolarized(polReso,AliDecayerPolarized::kHelicity,AliDecayerPolarized::kMuon);
500 AliInfo(Form("******Reference frame: %s, alpha: %f","Helicity",polReso));
503 decReso->SetForceDecay(kAll);
505 genReso->SetDecayer(decReso);
509 AddGenerator(genReso,nameReso,ratioReso); // Adding Generator
512 //-------------------------------------------------------------------
513 void AliGenMUONCocktailpp::Init()
516 TIter next(fEntries);
517 AliGenCocktailEntry *entry;
519 while((entry = (AliGenCocktailEntry*)next())) {
520 entry->Generator()->SetStack(fStack);
525 //_________________________________________________________________________
526 void AliGenMUONCocktailpp::Generate()
529 TIter next(fEntries);
530 AliGenCocktailEntry *entry = 0;
531 AliGenCocktailEntry *preventry = 0;
532 AliGenerator* gen = 0;
534 if (fHeader) delete fHeader;
535 fHeader = new AliGenCocktailEventHeader("MUON Cocktail Header");
537 const TObjArray *partArray = gAlice->GetMCApp()->Particles();
539 // Generate the vertex position used by all generators
540 if(fVertexSmear == kPerEvent) Vertex();
542 // Loop on primordialTrigger:
543 // minimum muon multiplicity above a pt cut in a theta acceptance region
545 Bool_t primordialTrigger = kFALSE;
546 while(!primordialTrigger) {
548 AliRunLoader * runloader = AliRunLoader::Instance();
550 if (runloader->Stack())
551 runloader->Stack()->Clean();
552 // Loop over generators and generate events
555 const char* genName = 0;
556 while((entry = (AliGenCocktailEntry*)next())) {
557 gen = entry->Generator();
558 genName = entry->GetName();
559 gen->SetVertex(fVertex.At(0), fVertex.At(1), fVertex.At(2));
562 npart = (strcmp(genName,"Pythia") == 0) ? 1 :
563 gRandom->Poisson(entry->Rate());
567 if (igen == 1) entry->SetFirst(0);
568 else entry->SetFirst((partArray->GetEntriesFast())+1);
570 gen->SetNumberParticles(npart);
572 entry->SetLast(partArray->GetEntriesFast());
579 // Testing primordial trigger: Single muons or dimuons with Pt above a Pt cut
580 // in the muon spectrometer acceptance
583 Int_t numberOfMuons=0;Int_t maxPart = partArray->GetEntriesFast();
584 for(iPart=0; iPart<maxPart; iPart++){
586 TParticle *part = gAlice->GetMCApp()->Particle(iPart);
587 if ( TMath::Abs(part->GetPdgCode()) == 13 ){
588 if((part->Vz() > fMuonOriginCut) && //take only the muons that decayed before the abs + 1 int. length in C abs
589 (part->Theta()*180./TMath::Pi()>fMuonThetaMinCut) &&
590 (part->Theta()*180./TMath::Pi()<fMuonThetaMaxCut) &&
591 (part->Pt()>fMuonPtCut) &&
592 (part->P()>fMuonPCut)) {
597 if (numberOfMuons >= fMuonMultiplicity) {
598 primordialTrigger = kTRUE;
599 fHeader->SetNProduced(maxPart);
607 for (Int_t j=0; j < 3; j++) eventVertex[j] = fVertex[j];
609 fHeader->SetPrimaryVertex(eventVertex);
610 fHeader->SetInteractionTime(fTime);
612 gAlice->SetGenEventHeader(fHeader);
614 // AliInfo(Form("Generated Events are %d and Succeeded Events are %d",fNGenerated,fNSucceded));
615 AliDebug(5,Form("Generated Events are %d and Succeeded Events are %d",fNGenerated,fNSucceded));