1 /**************************************************************************
2 * Copyright(c) 1998-1999, ALICE Experiment at CERN, All rights reserved. *
4 * Author: The ALICE Off-line Project. *
5 * Contributors are mentioned in the code where appropriate. *
7 * Permission to use, copy, modify and distribute this software and its *
8 * documentation strictly for non-commercial purposes is hereby granted *
9 * without fee, provided that the above copyright notice appears in all *
10 * copies and that both the copyright notice and this permission notice *
11 * appear in the supporting documentation. The authors make no claims *
12 * about the suitability of this software for any purpose. It is *
13 * provided "as is" without express or implied warranty. *
14 **************************************************************************/
19 // Classe to create the coktail for physics with muons for pp at 14 TeV
20 // The followoing sources:
21 // jpsi,psiP, upsilon, upsilonP, upsilonPP are added to Pythia
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
29 #include <TObjArray.h>
30 #include <TParticle.h>
32 #include <TVirtualMC.h>
34 #include "AliGenCocktailEventHeader.h"
36 #include "AliGenCocktailEntry.h"
37 #include "AliGenMUONCocktailpp.h"
38 #include "AliGenMUONlib.h"
39 #include "AliGenParam.h"
43 #include "AliDecayer.h"
45 #include "AliGenCorrHF.h"
47 ClassImp(AliGenMUONCocktailpp)
49 //________________________________________________________________________
50 AliGenMUONCocktailpp::AliGenMUONCocktailpp()
53 fDecayModeResonance(kAll),
54 fDecayModePythia(kAll),
59 fMuonThetaMaxCut(180.),
60 fMuonOriginCut(-999.),
65 fSigmaUpsilon(0.989e-6),
66 fSigmaUpsilonP(0.502e-6),
67 fSigmaUpsilonPP(0.228e-6),
75 //_________________________________________________________________________
76 AliGenMUONCocktailpp::~AliGenMUONCocktailpp()
82 //_________________________________________________________________________
83 void AliGenMUONCocktailpp::CreateCocktail()
85 // MinBias NN cross section @ pp 14 TeV -PR Vol II p:473
86 Double_t sigmaReaction = 0.070;
88 // These limits are only used for renormalization of quarkonia cross section
89 // Pythia events are generated in 4pi
90 Double_t ptMin = fPtMin;
91 Double_t ptMax = fPtMax;
92 Double_t yMin = fYMin;;
93 Double_t yMax = fYMax;;
94 Double_t phiMin = fPhiMin*180./TMath::Pi();
95 Double_t phiMax = fPhiMax*180./TMath::Pi();
96 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));
98 // Ratios with respect to the reaction cross-section in the
99 // kinematics limit of the MUONCocktail
102 Double_t ratioupsilon;
103 Double_t ratioupsilonP;
104 Double_t ratioupsilonPP;
108 // Cross sections in barns (from PPR Vol. II p: 552) pp - 14 TeV and
109 // corrected from feed down of higher resonances
111 Double_t sigmajpsi = fSigmaJPsi;
112 Double_t sigmapsiP = fSigmaPsiP;
113 Double_t sigmaupsilon = fSigmaUpsilon;
114 Double_t sigmaupsilonP = fSigmaUpsilonP;
115 Double_t sigmaupsilonPP = fSigmaUpsilonPP;
116 Double_t sigmaccbar = fSigmaCCbar;
117 Double_t sigmabbbar = fSigmaBBbar;
119 AliInfo(Form("the parametrised resonances uses the decay mode %d",fDecayModeResonance));
121 // Generation using CDF scaled distribution for pp@14TeV (from D. Stocco)
122 //----------------------------------------------------------------------
124 AliGenParam * genjpsi = new AliGenParam(1, AliGenMUONlib::kJpsi, "CDF pp", "Jpsi");
125 // first step: generation in 4pi
126 genjpsi->SetPtRange(0.,100.);
127 genjpsi->SetYRange(-8.,8.);
128 genjpsi->SetPhiRange(0.,360.);
129 genjpsi->SetForceDecay(fDecayModeResonance);
130 if (!gMC) genjpsi->SetDecayer(fDecayer);
132 genjpsi->Init(); // generation in 4pi
133 ratiojpsi = sigmajpsi / sigmaReaction * genjpsi->GetRelativeArea(ptMin,ptMax,yMin,yMax,phiMin,phiMax); // get weight
135 AliInfo(Form("jpsi prod. cross-section in pp(14 TeV) %5.3g b",sigmajpsi));
136 AliInfo(Form("jpsi prod. probability per collision in acceptance %5.3g",ratiojpsi));
138 // second step: generation in selected kinematical range
139 genjpsi->SetPtRange(ptMin, ptMax);
140 genjpsi->SetYRange(yMin, yMax);
141 genjpsi->SetPhiRange(phiMin, phiMax);
142 genjpsi->Init(); // generation in selected kinematic range
143 AddGenerator(genjpsi, "Jpsi", ratiojpsi); // Adding Generator
144 //------------------------------------------------------------------
145 // Psi prime generator
146 AliGenParam * genpsiP = new AliGenParam(1, AliGenMUONlib::kPsiP, "CDF pp", "PsiP");
147 // first step: generation in 4pi
148 genpsiP->SetPtRange(0.,100.);
149 genpsiP->SetYRange(-8.,8.);
150 genpsiP->SetPhiRange(0.,360.);
151 genpsiP->SetForceDecay(fDecayModeResonance);
152 if (!gMC) genpsiP->SetDecayer(fDecayer);
154 genpsiP->Init(); // generation in 4pi
155 ratiopsiP = sigmapsiP / sigmaReaction * genpsiP->GetRelativeArea(ptMin,ptMax,yMin,yMax,phiMin,phiMax);
157 AliInfo(Form("psiP prod. cross-section in pp(14 TeV) %5.3g b",sigmapsiP));
158 AliInfo(Form("psiP prod. probability per collision in acceptance %5.3g",ratiopsiP));
160 // second step: generation in selected kinematical range
161 genpsiP->SetPtRange(ptMin, ptMax);
162 genpsiP->SetYRange(yMin, yMax);
163 genpsiP->SetPhiRange(phiMin, phiMax);
164 genpsiP->Init(); // generation in selected kinematic range
165 AddGenerator(genpsiP, "PsiP", ratiopsiP); // Adding Generator
166 //------------------------------------------------------------------
167 // Upsilon 1S generator
168 AliGenParam * genupsilon = new AliGenParam(1, AliGenMUONlib::kUpsilon, "CDF pp", "Upsilon");
169 // first step: generation in 4pi
170 genupsilon->SetPtRange(0.,100.);
171 genupsilon->SetYRange(-8.,8.);
172 genupsilon->SetPhiRange(0.,360.);
173 genupsilon->SetForceDecay(fDecayModeResonance);
174 if (!gMC) genupsilon->SetDecayer(fDecayer);
175 genupsilon->Init(); // generation in 4pi
176 ratioupsilon = sigmaupsilon / sigmaReaction * genupsilon->GetRelativeArea(ptMin,ptMax,yMin,yMax,phiMin,phiMax);
178 AliInfo(Form("Upsilon 1S prod. cross-section in pp(14 TeV) %5.3g b",sigmaupsilon));
179 AliInfo(Form("Upsilon 1S prod. probability per collision in acceptance %5.3g",ratioupsilon));
181 // second step: generation in selected kinematical range
182 genupsilon->SetPtRange(ptMin, ptMax);
183 genupsilon->SetYRange(yMin, yMax);
184 genupsilon->SetPhiRange(phiMin, phiMax);
185 genupsilon->Init(); // generation in selected kinematical range
186 AddGenerator(genupsilon,"Upsilon", ratioupsilon); // Adding Generator
187 //------------------------------------------------------------------
188 // Upsilon 2S generator
189 AliGenParam * genupsilonP = new AliGenParam(1, AliGenMUONlib::kUpsilonP, "CDF pp", "UpsilonP");
190 // first step: generation in 4pi
191 genupsilonP->SetPtRange(0.,100.);
192 genupsilonP->SetYRange(-8.,8.);
193 genupsilonP->SetPhiRange(0.,360.);
194 genupsilonP->SetForceDecay(fDecayModeResonance);
195 if (!gMC) genupsilonP->SetDecayer(fDecayer);
196 genupsilonP->Init(); // generation in 4pi
197 ratioupsilonP = sigmaupsilonP / sigmaReaction * genupsilonP->GetRelativeArea(ptMin,ptMax,yMin,yMax,phiMin,phiMax);
199 AliInfo(Form("Upsilon 2S prod. cross-section in pp(14 TeV) %5.3g b",sigmaupsilonP));
200 AliInfo(Form("Upsilon 2S prod. probability per collision in acceptance %5.3g",ratioupsilonP));
202 // second step: generation in the kinematical range
203 genupsilonP->SetPtRange(ptMin, ptMax);
204 genupsilonP->SetYRange(yMin, yMax);
205 genupsilonP->SetPhiRange(phiMin, phiMax);
206 genupsilonP->Init(); // generation in selected kinematical range
207 AddGenerator(genupsilonP,"UpsilonP", ratioupsilonP); // Adding Generator
209 //------------------------------------------------------------------
210 // Upsilon 3S generator
211 AliGenParam * genupsilonPP = new AliGenParam(1, AliGenMUONlib::kUpsilonPP, "CDF pp", "UpsilonPP");
212 // first step: generation in 4pi
213 genupsilonPP->SetPtRange(0.,100.);
214 genupsilonPP->SetYRange(-8.,8.);
215 genupsilonPP->SetPhiRange(0.,360.);
216 genupsilonPP->SetForceDecay(fDecayModeResonance);
217 if (!gMC) genupsilonPP->SetDecayer(fDecayer);
218 genupsilonPP->Init(); // generation in 4pi
219 ratioupsilonPP = sigmaupsilonPP / sigmaReaction * genupsilonPP->GetRelativeArea(ptMin,ptMax,yMin,yMax,phiMin,phiMax);
221 AliInfo(Form("Upsilon 3S prod. cross-section in pp(14 TeV) %5.3g b",sigmaupsilonPP));
222 AliInfo(Form("Upsilon 3S prod. probability per collision in acceptance %5.3g",ratioupsilonPP));
224 // second step: generation in selected kinematical range
225 genupsilonPP->SetPtRange(ptMin, ptMax);
226 genupsilonPP->SetYRange(yMin, yMax);
227 genupsilonPP->SetPhiRange(phiMin, phiMax);
228 genupsilonPP->Init(); // generation in selected kinematical range
229 AddGenerator(genupsilonPP,"UpsilonPP", ratioupsilonPP); // Adding Generator
231 //------------------------------------------------------------------
232 // Generator of charm
234 AliGenCorrHF *gencharm = new AliGenCorrHF(1, 4);
235 gencharm->SetMomentumRange(0,9999);
236 gencharm->SetForceDecay(kAll);
237 ratioccbar = sigmaccbar/sigmaReaction;
238 if (!gMC) gencharm->SetDecayer(fDecayer);
241 AliInfo(Form("c-cbar prod. cross-section in pp(14 TeV) %5.3g b",sigmaccbar));
242 AliInfo(Form("c-cbar prod. probability per collision in acceptance %5.3g",ratioccbar));
244 AddGenerator(gencharm,"CorrHFCharm",ratioccbar);
246 //------------------------------------------------------------------
247 // Generator of beauty
249 AliGenCorrHF *genbeauty = new AliGenCorrHF(1, 5);
250 genbeauty->SetMomentumRange(0,9999);
251 genbeauty->SetForceDecay(kAll);
252 ratiobbbar = sigmabbbar/sigmaReaction;
253 if (!gMC) genbeauty->SetDecayer(fDecayer);
256 AliInfo(Form("b-bbar prod. cross-section in pp(14 TeV) %5.3g b",sigmabbbar));
257 AliInfo(Form("b-bbar prod. probability per collision in acceptance %5.3g",ratiobbbar));
259 AddGenerator(genbeauty,"CorrHFBeauty",ratiobbbar);
261 //-------------------------------------------------------------------
264 // This has to go into the Config.C
266 // AliGenPythia *pythia = new AliGenPythia(1);
267 // pythia->SetProcess(kPyMbMSEL1);
268 // pythia->SetStrucFunc(kCTEQ5L);
269 // pythia->SetEnergyCMS(14000.);
270 // AliInfo(Form("\n\npythia uses the decay mode %d", GetDecayModePythia()));
271 // Decay_t dt = gener->GetDecayModePythia();
272 // pythia->SetForceDecay(dt);
273 // pythia->SetPtRange(0.,100.);
274 // pythia->SetYRange(-8.,8.);
275 // pythia->SetPhiRange(0.,360.);
276 // pythia->SetPtHard(2.76,-1.0);
277 // pythia->SwitchHFOff();
279 // AddGenerator(pythia,"Pythia",1);
282 void AliGenMUONCocktailpp::Init()
286 TIter next(fEntries);
287 AliGenCocktailEntry *entry;
289 while((entry = (AliGenCocktailEntry*)next())) {
290 entry->Generator()->SetStack(fStack);
295 //_________________________________________________________________________
296 void AliGenMUONCocktailpp::Generate()
299 TIter next(fEntries);
300 AliGenCocktailEntry *entry = 0;
301 AliGenCocktailEntry *preventry = 0;
302 AliGenerator* gen = 0;
304 const TObjArray *partArray = gAlice->GetMCApp()->Particles();
306 // Generate the vertex position used by all generators
307 if(fVertexSmear == kPerEvent) Vertex();
309 // Loop on primordialTrigger:
310 // minimum muon multiplicity above a pt cut in a theta acceptance region
312 Bool_t primordialTrigger = kFALSE;
313 while(!primordialTrigger) {
315 AliRunLoader * runloader = AliRunLoader::Instance();
317 if (runloader->Stack())
318 runloader->Stack()->Clean();
319 // Loop over generators and generate events
322 const char* genName = 0;
323 while((entry = (AliGenCocktailEntry*)next())) {
324 gen = entry->Generator();
325 genName = entry->GetName();
326 gen->SetVertex(fVertex.At(0), fVertex.At(1), fVertex.At(2));
328 npart = (strcmp(genName,"Pythia") == 0) ? 1 :
329 gRandom->Poisson(entry->Rate());
333 if (igen == 1) entry->SetFirst(0);
334 else entry->SetFirst((partArray->GetEntriesFast())+1);
336 gen->SetNumberParticles(npart);
338 entry->SetLast(partArray->GetEntriesFast());
344 // Testing primordial trigger: Single muons or dimuons with Pt above a Pt cut
345 // in the muon spectrometer acceptance
348 Int_t numberOfMuons=0;Int_t maxPart = partArray->GetEntriesFast();
349 for(iPart=0; iPart<maxPart; iPart++){
351 TParticle *part = gAlice->GetMCApp()->Particle(iPart);
352 if ( TMath::Abs(part->GetPdgCode()) == 13 ){
353 if((part->Vz() > fMuonOriginCut) && //take only the muons that decayed before the abs + 1 int. length in C abs
354 (part->Theta()*180./TMath::Pi()>fMuonThetaMinCut) &&
355 (part->Theta()*180./TMath::Pi()<fMuonThetaMaxCut) &&
356 (part->Pt()>fMuonPtCut) &&
357 (part->P()>fMuonPCut)) {
362 if (numberOfMuons >= fMuonMultiplicity) primordialTrigger = kTRUE;
366 // AliInfo(Form("Generated Events are %d and Succeeded Events are %d",fNGenerated,fNSucceded));
367 AliDebug(5,Form("Generated Events are %d and Succeeded Events are %d",fNGenerated,fNSucceded));