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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
27 #include <TObjArray.h>
28 #include <TParticle.h>
31 #include "AliGenCocktailEventHeader.h"
33 #include "AliGenCocktailEntry.h"
34 #include "AliGenMUONCocktailpp.h"
35 #include "AliGenMUONlib.h"
36 #include "AliGenParam.h"
41 #include "AliGenPythia.h"
44 ClassImp(AliGenMUONCocktailpp)
46 //________________________________________________________________________
47 AliGenMUONCocktailpp::AliGenMUONCocktailpp()
59 //_________________________________________________________________________
60 AliGenMUONCocktailpp::AliGenMUONCocktailpp(const AliGenMUONCocktailpp & cocktail):
61 AliGenCocktail(cocktail)
72 //_________________________________________________________________________
73 AliGenMUONCocktailpp::~AliGenMUONCocktailpp()
79 //_________________________________________________________________________
80 void AliGenMUONCocktailpp::Init()
82 // MinBias NN cross section @ pp 14 TeV -PR Vol II p:473
83 Double_t sigmaReaction = 0.070;
85 // These limits are only used for renormalization of quarkonia cross section
86 // Pythia events are generated in 4pi
87 Double_t ptMin = fPtMin;
88 Double_t ptMax = fPtMax;
89 Double_t yMin = fYMin;;
90 Double_t yMax = fYMax;;
91 Double_t phiMin = fPhiMin*180./TMath::Pi();
92 Double_t phiMax = fPhiMax*180./TMath::Pi();
93 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));
95 // Ratios with respect to the reaction cross-section in the
96 // kinematics limit of the MUONCocktail
99 Double_t ratioupsilon;
100 Double_t ratioupsilonP;
101 Double_t ratioupsilonPP;
103 // Cross sections in barns (from PPR Vol. II p: 552) pp - 14 TeV
105 Double_t sigmajpsi = 53.85e-6;
106 Double_t sigmapsiP = 7.67e-6;
107 Double_t sigmaupsilon = 1.15e-6;
108 Double_t sigmaupsilonP = 0.526e-6;
109 Double_t sigmaupsilonPP = 0.228e-6;
111 // Generation using CDF scaled distribution
112 //(See http://clrwww.in2p3.fr/DIMUON2004/talks/sgrigoryan.pdf )
114 //------------------------------------------------------------------
116 AliGenParam * genjpsi = new AliGenParam(1, AliGenMUONlib::kJpsi, "CDF scaled", "Jpsi");
117 // first step: generation in 4pi
118 genjpsi->SetPtRange(0.,100.);
119 genjpsi->SetYRange(-8.,8.);
120 genjpsi->SetPhiRange(0.,360.);
121 genjpsi->SetForceDecay(kAll);
122 genjpsi->Init(); // generation in 4pi
123 ratiojpsi = sigmajpsi / sigmaReaction * genjpsi->GetRelativeArea(ptMin,ptMax,yMin,yMax,phiMin,phiMax); // get weight
124 AliInfo(Form("jpsi prod. cross-section in pp(14 TeV) %5.3g b",sigmajpsi));
125 AliInfo(Form("jpsi prod. probability per collision in acceptance %5.3g",ratiojpsi));
126 // second step: generation in selected kinematical range
127 genjpsi->SetPtRange(ptMin, ptMax);
128 genjpsi->SetYRange(yMin, yMax);
129 genjpsi->SetPhiRange(phiMin, phiMax);
130 genjpsi->Init(); // generation in selected kinematic range
131 AddGenerator(genjpsi, "Jpsi", ratiojpsi); // Adding Generator
132 fTotalRate+=ratiojpsi;
134 //------------------------------------------------------------------
135 // Psi prime generator
136 AliGenParam * genpsiP = new AliGenParam(1, AliGenMUONlib::kPsiP, "CDF scaled", "PsiP");
137 // first step: generation in 4pi
138 genpsiP->SetPtRange(0.,100.);
139 genpsiP->SetYRange(-8.,8.);
140 genpsiP->SetPhiRange(0.,360.);
141 genpsiP->SetForceDecay(kAll);
142 genpsiP->Init(); // generation in 4pi
143 ratiopsiP = sigmapsiP / sigmaReaction * genpsiP->GetRelativeArea(ptMin,ptMax,yMin,yMax,phiMin,phiMax);
144 AliInfo(Form("psiP prod. cross-section in pp(14 TeV) %5.3g b",sigmapsiP));
145 AliInfo(Form("psiP prod. probability per collision in acceptance %5.3g",ratiopsiP));
146 // second step: generation in selected kinematical range
147 genpsiP->SetPtRange(ptMin, ptMax);
148 genpsiP->SetYRange(yMin, yMax);
149 genpsiP->SetPhiRange(phiMin, phiMax);
150 genpsiP->Init(); // generation in selected kinematic range
151 AddGenerator(genpsiP, "PsiP", ratiopsiP); // Adding Generator
152 fTotalRate+=ratiopsiP;
154 //------------------------------------------------------------------
155 // Upsilon 1S generator
156 AliGenParam * genupsilon = new AliGenParam(1, AliGenMUONlib::kUpsilon, "CDF scaled", "Upsilon");
157 // first step: generation in 4pi
158 genupsilon->SetPtRange(0.,100.);
159 genupsilon->SetYRange(-8.,8.);
160 genupsilon->SetPhiRange(0.,360.);
161 genupsilon->SetForceDecay(kAll);
162 genupsilon->Init(); // generation in 4pi
163 ratioupsilon = sigmaupsilon / sigmaReaction * genupsilon->GetRelativeArea(ptMin,ptMax,yMin,yMax,phiMin,phiMax);
164 AliInfo(Form("Upsilon 1S prod. cross-section in pp(14 TeV) %5.3g b",sigmaupsilon));
165 AliInfo(Form("Upsilon 1S prod. probability per collision in acceptance %5.3g",ratioupsilon));
166 // second step: generation in selected kinematical range
167 genupsilon->SetPtRange(ptMin, ptMax);
168 genupsilon->SetYRange(yMin, yMax);
169 genupsilon->SetPhiRange(phiMin, phiMax);
170 genupsilon->Init(); // generation in selected kinematical range
171 AddGenerator(genupsilon,"Upsilon", ratioupsilon); // Adding Generator
172 fTotalRate+=ratioupsilon;
174 //------------------------------------------------------------------
175 // Upsilon 2S generator
176 AliGenParam * genupsilonP = new AliGenParam(1, AliGenMUONlib::kUpsilonP, "CDF scaled", "UpsilonP");
177 // first step: generation in 4pi
178 genupsilonP->SetPtRange(0.,100.);
179 genupsilonP->SetYRange(-8.,8.);
180 genupsilonP->SetPhiRange(0.,360.);
181 genupsilonP->SetForceDecay(kAll);
182 genupsilonP->Init(); // generation in 4pi
183 ratioupsilonP = sigmaupsilonP / sigmaReaction * genupsilonP->GetRelativeArea(ptMin,ptMax,yMin,yMax,phiMin,phiMax);
184 AliInfo(Form("Upsilon 2S prod. cross-section in pp(14 TeV) %5.3g b",sigmaupsilonP));
185 AliInfo(Form("Upsilon 2S prod. probability per collision in acceptance %5.3g",ratioupsilonP));
186 // second step: generation in the kinematical range
187 genupsilonP->SetPtRange(ptMin, ptMax);
188 genupsilonP->SetYRange(yMin, yMax);
189 genupsilonP->SetPhiRange(phiMin, phiMax);
190 genupsilonP->Init(); // generation in selected kinematical range
191 AddGenerator(genupsilonP,"UpsilonP", ratioupsilonP); // Adding Generator
192 fTotalRate+=ratioupsilonP;
194 //------------------------------------------------------------------
195 // Upsilon 3S generator
196 AliGenParam * genupsilonPP = new AliGenParam(1, AliGenMUONlib::kUpsilonPP, "CDF scaled", "UpsilonPP");
197 // first step: generation in 4pi
198 genupsilonPP->SetPtRange(0.,100.);
199 genupsilonPP->SetYRange(-8.,8.);
200 genupsilonPP->SetPhiRange(0.,360.);
201 genupsilonPP->SetForceDecay(kAll);
202 genupsilonPP->Init(); // generation in 4pi
203 ratioupsilonPP = sigmaupsilonPP / sigmaReaction * genupsilonPP->GetRelativeArea(ptMin,ptMax,yMin,yMax,phiMin,phiMax);
204 AliInfo(Form("Upsilon 3S prod. cross-section in pp(14 TeV) %5.3g b",sigmaupsilonPP));
205 AliInfo(Form("Upsilon 3S prod. probability per collision in acceptance %5.3g",ratioupsilonPP));
206 // second step: generation in selected kinematical range
207 genupsilonPP->SetPtRange(ptMin, ptMax);
208 genupsilonPP->SetYRange(yMin, yMax);
209 genupsilonPP->SetPhiRange(phiMin, phiMax);
210 genupsilonPP->Init(); // generation in selected kinematical range
211 AddGenerator(genupsilonPP,"UpsilonPP", ratioupsilonPP); // Adding Generator
212 fTotalRate+=ratioupsilonPP;
214 //------------------------------------------------------------------
216 AliGenPythia *pythia = new AliGenPythia(1);
217 pythia->SetProcess(kPyMbMSEL1);
218 pythia->SetStrucFunc(kCTEQ5L);
219 pythia->SetEnergyCMS(14000.);
220 pythia->SetForceDecay(kAll);
221 pythia->SetPtRange(0.,100.);
222 pythia->SetYRange(-8.,8.);
223 pythia->SetPhiRange(0.,360.);
224 pythia->SetPtHard(2.76,-1.0);
226 AddGenerator(pythia,"Pythia",1);
231 //_________________________________________________________________________
232 void AliGenMUONCocktailpp::Generate()
235 TIter next(fEntries);
236 AliGenCocktailEntry *entry = 0;
237 AliGenCocktailEntry *preventry = 0;
238 AliGenerator* gen = 0;
240 TObjArray *partArray = gAlice->GetMCApp()->Particles();
242 // Generate the vertex position used by all generators
243 if(fVertexSmear == kPerEvent) Vertex();
245 // Loop on primordialTrigger:
246 // minimum muon multiplicity above a pt cut in a theta acceptance region
248 Bool_t primordialTrigger = kFALSE;
249 while(!primordialTrigger) {
251 AliRunLoader * runloader = gAlice->GetRunLoader();
253 if (runloader->Stack())
254 runloader->Stack()->Reset();
255 // Loop over generators and generate events
258 const char* genName = 0;
259 while((entry = (AliGenCocktailEntry*)next())) {
260 gen = entry->Generator();
261 genName = entry->GetName();
262 gen->SetVertex(fVertex.At(0), fVertex.At(1), fVertex.At(2));
264 npart = (strcmp(genName,"Pythia") == 0) ? 1 :
265 gRandom->Poisson(entry->Rate());
269 if (igen == 1) entry->SetFirst(0);
270 else entry->SetFirst((partArray->GetEntriesFast())+1);
272 gen->SetNumberParticles(npart);
274 entry->SetLast(partArray->GetEntriesFast());
280 // Testing primordial trigger: Single muons or dimuons with Pt above a Pt cut
281 // in the muon spectrometer acceptance
284 Int_t numberOfMuons=0;
286 for(iPart=0; iPart<partArray->GetEntriesFast(); iPart++){
288 if ( (TMath::Abs(gAlice->GetMCApp()->Particle(iPart)->GetPdgCode())==13) &&
289 (gAlice->GetMCApp()->Particle(iPart)->Theta()*180./TMath::Pi()>fMuonThetaMinCut) &&
290 (gAlice->GetMCApp()->Particle(iPart)->Theta()*180./TMath::Pi()<fMuonThetaMaxCut) &&
291 (gAlice->GetMCApp()->Particle(iPart)->Pt()>fMuonPtCut) ) {
297 if (numberOfMuons >= fMuonMultiplicity) primordialTrigger = kTRUE;
301 AliInfo(Form("Generated Events are %d and Succeeded Events are %d",fNGenerated,fNSucceded));
302 AliDebug(5,Form("Generated Events are %d and Succeeded Events are %d",fNGenerated,fNSucceded));