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 "AliGenPythia.h"
46 #include "AliGenCorrHF.h"
48 ClassImp(AliGenMUONCocktailpp)
50 //________________________________________________________________________
51 AliGenMUONCocktailpp::AliGenMUONCocktailpp()
54 fDecayModeResonance(kAll),
55 fDecayModePythia(kAll),
61 fMuonThetaMaxCut(180.),
62 fMuonOriginCut(-999.),
69 //_________________________________________________________________________
70 AliGenMUONCocktailpp::~AliGenMUONCocktailpp()
76 //_________________________________________________________________________
77 void AliGenMUONCocktailpp::Init()
79 // MinBias NN cross section @ pp 14 TeV -PR Vol II p:473
80 Double_t sigmaReaction = 0.070;
82 // These limits are only used for renormalization of quarkonia cross section
83 // Pythia events are generated in 4pi
84 Double_t ptMin = fPtMin;
85 Double_t ptMax = fPtMax;
86 Double_t yMin = fYMin;;
87 Double_t yMax = fYMax;;
88 Double_t phiMin = fPhiMin*180./TMath::Pi();
89 Double_t phiMax = fPhiMax*180./TMath::Pi();
90 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));
92 // Ratios with respect to the reaction cross-section in the
93 // kinematics limit of the MUONCocktail
96 Double_t ratioupsilon;
97 Double_t ratioupsilonP;
98 Double_t ratioupsilonPP;
102 // Cross sections in barns (from PPR Vol. II p: 552) pp - 14 TeV and
103 // corrected from feed down of higher resonances
105 Double_t sigmajpsi = 49.44e-6;
106 Double_t sigmapsiP = 7.67e-6;
107 Double_t sigmaupsilon = 0.989e-6;
108 Double_t sigmaupsilonP = 0.502e-6;
109 Double_t sigmaupsilonPP = 0.228e-6;
110 Double_t sigmaccbar = 11.2e-3;
111 Double_t sigmabbbar = 0.51e-3;
113 AliInfo(Form("the parametrised resonances uses the decay mode %d",fDecayModeResonance));
115 // Generation using CDF scaled distribution for pp@14TeV (from D. Stocco)
116 //----------------------------------------------------------------------
118 AliGenParam * genjpsi = new AliGenParam(1, AliGenMUONlib::kJpsi, "CDF pp", "Jpsi");
119 // first step: generation in 4pi
120 genjpsi->SetPtRange(0.,100.);
121 genjpsi->SetYRange(-8.,8.);
122 genjpsi->SetPhiRange(0.,360.);
123 genjpsi->SetForceDecay(fDecayModeResonance);
124 if (!gMC) genjpsi->SetDecayer(fDecayer);
126 genjpsi->Init(); // generation in 4pi
127 ratiojpsi = sigmajpsi / sigmaReaction * genjpsi->GetRelativeArea(ptMin,ptMax,yMin,yMax,phiMin,phiMax); // get weight
128 AliInfo(Form("jpsi prod. cross-section in pp(14 TeV) %5.3g b",sigmajpsi));
129 AliInfo(Form("jpsi prod. probability per collision in acceptance %5.3g",ratiojpsi));
130 // second step: generation in selected kinematical range
131 genjpsi->SetPtRange(ptMin, ptMax);
132 genjpsi->SetYRange(yMin, yMax);
133 genjpsi->SetPhiRange(phiMin, phiMax);
134 genjpsi->Init(); // generation in selected kinematic range
135 AddGenerator(genjpsi, "Jpsi", ratiojpsi); // Adding Generator
136 fTotalRate+=ratiojpsi;
138 //------------------------------------------------------------------
139 // Psi prime generator
140 AliGenParam * genpsiP = new AliGenParam(1, AliGenMUONlib::kPsiP, "CDF pp", "PsiP");
141 // first step: generation in 4pi
142 genpsiP->SetPtRange(0.,100.);
143 genpsiP->SetYRange(-8.,8.);
144 genpsiP->SetPhiRange(0.,360.);
145 genpsiP->SetForceDecay(fDecayModeResonance);
146 if (!gMC) genpsiP->SetDecayer(fDecayer);
148 genpsiP->Init(); // generation in 4pi
149 ratiopsiP = sigmapsiP / sigmaReaction * genpsiP->GetRelativeArea(ptMin,ptMax,yMin,yMax,phiMin,phiMax);
150 AliInfo(Form("psiP prod. cross-section in pp(14 TeV) %5.3g b",sigmapsiP));
151 AliInfo(Form("psiP prod. probability per collision in acceptance %5.3g",ratiopsiP));
152 // second step: generation in selected kinematical range
153 genpsiP->SetPtRange(ptMin, ptMax);
154 genpsiP->SetYRange(yMin, yMax);
155 genpsiP->SetPhiRange(phiMin, phiMax);
156 genpsiP->Init(); // generation in selected kinematic range
157 AddGenerator(genpsiP, "PsiP", ratiopsiP); // Adding Generator
158 fTotalRate+=ratiopsiP;
160 //------------------------------------------------------------------
161 // Upsilon 1S generator
162 AliGenParam * genupsilon = new AliGenParam(1, AliGenMUONlib::kUpsilon, "CDF pp", "Upsilon");
163 // first step: generation in 4pi
164 genupsilon->SetPtRange(0.,100.);
165 genupsilon->SetYRange(-8.,8.);
166 genupsilon->SetPhiRange(0.,360.);
167 genupsilon->SetForceDecay(fDecayModeResonance);
168 if (!gMC) genupsilon->SetDecayer(fDecayer);
169 genupsilon->Init(); // generation in 4pi
170 ratioupsilon = sigmaupsilon / sigmaReaction * genupsilon->GetRelativeArea(ptMin,ptMax,yMin,yMax,phiMin,phiMax);
171 AliInfo(Form("Upsilon 1S prod. cross-section in pp(14 TeV) %5.3g b",sigmaupsilon));
172 AliInfo(Form("Upsilon 1S prod. probability per collision in acceptance %5.3g",ratioupsilon));
173 // second step: generation in selected kinematical range
174 genupsilon->SetPtRange(ptMin, ptMax);
175 genupsilon->SetYRange(yMin, yMax);
176 genupsilon->SetPhiRange(phiMin, phiMax);
177 genupsilon->Init(); // generation in selected kinematical range
178 AddGenerator(genupsilon,"Upsilon", ratioupsilon); // Adding Generator
179 fTotalRate+=ratioupsilon;
181 //------------------------------------------------------------------
182 // Upsilon 2S generator
183 AliGenParam * genupsilonP = new AliGenParam(1, AliGenMUONlib::kUpsilonP, "CDF pp", "UpsilonP");
184 // first step: generation in 4pi
185 genupsilonP->SetPtRange(0.,100.);
186 genupsilonP->SetYRange(-8.,8.);
187 genupsilonP->SetPhiRange(0.,360.);
188 genupsilonP->SetForceDecay(fDecayModeResonance);
189 if (!gMC) genupsilonP->SetDecayer(fDecayer);
190 genupsilonP->Init(); // generation in 4pi
191 ratioupsilonP = sigmaupsilonP / sigmaReaction * genupsilonP->GetRelativeArea(ptMin,ptMax,yMin,yMax,phiMin,phiMax);
192 AliInfo(Form("Upsilon 2S prod. cross-section in pp(14 TeV) %5.3g b",sigmaupsilonP));
193 AliInfo(Form("Upsilon 2S prod. probability per collision in acceptance %5.3g",ratioupsilonP));
194 // second step: generation in the kinematical range
195 genupsilonP->SetPtRange(ptMin, ptMax);
196 genupsilonP->SetYRange(yMin, yMax);
197 genupsilonP->SetPhiRange(phiMin, phiMax);
198 genupsilonP->Init(); // generation in selected kinematical range
199 AddGenerator(genupsilonP,"UpsilonP", ratioupsilonP); // Adding Generator
200 fTotalRate+=ratioupsilonP;
202 //------------------------------------------------------------------
203 // Upsilon 3S generator
204 AliGenParam * genupsilonPP = new AliGenParam(1, AliGenMUONlib::kUpsilonPP, "CDF pp", "UpsilonPP");
205 // first step: generation in 4pi
206 genupsilonPP->SetPtRange(0.,100.);
207 genupsilonPP->SetYRange(-8.,8.);
208 genupsilonPP->SetPhiRange(0.,360.);
209 genupsilonPP->SetForceDecay(fDecayModeResonance);
210 if (!gMC) genupsilonPP->SetDecayer(fDecayer);
211 genupsilonPP->Init(); // generation in 4pi
212 ratioupsilonPP = sigmaupsilonPP / sigmaReaction * genupsilonPP->GetRelativeArea(ptMin,ptMax,yMin,yMax,phiMin,phiMax);
213 AliInfo(Form("Upsilon 3S prod. cross-section in pp(14 TeV) %5.3g b",sigmaupsilonPP));
214 AliInfo(Form("Upsilon 3S prod. probability per collision in acceptance %5.3g",ratioupsilonPP));
215 // second step: generation in selected kinematical range
216 genupsilonPP->SetPtRange(ptMin, ptMax);
217 genupsilonPP->SetYRange(yMin, yMax);
218 genupsilonPP->SetPhiRange(phiMin, phiMax);
219 genupsilonPP->Init(); // generation in selected kinematical range
220 AddGenerator(genupsilonPP,"UpsilonPP", ratioupsilonPP); // Adding Generator
221 fTotalRate+=ratioupsilonPP;
223 //------------------------------------------------------------------
224 // Generator of charm
226 AliGenCorrHF *gencharm = new AliGenCorrHF(1, 4);
227 gencharm->SetMomentumRange(0,9999);
228 gencharm->SetForceDecay(kAll);
229 ratioccbar = sigmaccbar/sigmaReaction;
231 AddGenerator(gencharm,"CorrHFCharm",ratioccbar);
232 fTotalRate+=ratioccbar;
234 //------------------------------------------------------------------
235 // Generator of beauty
237 AliGenCorrHF *genbeauty = new AliGenCorrHF(1, 5);
238 genbeauty->SetMomentumRange(0,9999);
239 genbeauty->SetForceDecay(kAll);
240 ratiobbbar = sigmabbbar/sigmaReaction;
242 AddGenerator(genbeauty,"CorrHFBeauty",ratiobbbar);
243 fTotalRate+=ratiobbbar;
245 //--------------------------t----------------------------------------
247 AliGenPythia *pythia = new AliGenPythia(1);
248 pythia->SetProcess(kPyMbMSEL1);
249 pythia->SetStrucFunc(kCTEQ5L);
250 pythia->SetEnergyCMS(14000.);
251 AliInfo(Form("\n\npythia uses the decay mode %d",fDecayModePythia));
252 pythia->SetForceDecay(fDecayModePythia);
253 pythia->SetPtRange(0.,100.);
254 pythia->SetYRange(-8.,8.);
255 pythia->SetPhiRange(0.,360.);
256 pythia->SetPtHard(2.76,-1.0);
257 pythia->SwitchHFOff();
259 AddGenerator(pythia,"Pythia",1);
262 TIter next(fEntries);
263 AliGenCocktailEntry *entry;
265 while((entry = (AliGenCocktailEntry*)next())) {
266 entry->Generator()->SetStack(fStack);
271 //_________________________________________________________________________
272 void AliGenMUONCocktailpp::Generate()
275 TIter next(fEntries);
276 AliGenCocktailEntry *entry = 0;
277 AliGenCocktailEntry *preventry = 0;
278 AliGenerator* gen = 0;
280 TObjArray *partArray = gAlice->GetMCApp()->Particles();
282 // Generate the vertex position used by all generators
283 if(fVertexSmear == kPerEvent) Vertex();
285 // Loop on primordialTrigger:
286 // minimum muon multiplicity above a pt cut in a theta acceptance region
288 Bool_t primordialTrigger = kFALSE;
289 while(!primordialTrigger) {
291 AliRunLoader * runloader = gAlice->GetRunLoader();
293 if (runloader->Stack())
294 runloader->Stack()->Clean();
295 // Loop over generators and generate events
298 const char* genName = 0;
299 while((entry = (AliGenCocktailEntry*)next())) {
300 gen = entry->Generator();
301 genName = entry->GetName();
302 gen->SetVertex(fVertex.At(0), fVertex.At(1), fVertex.At(2));
304 npart = (strcmp(genName,"Pythia") == 0) ? 1 :
305 gRandom->Poisson(entry->Rate());
309 if (igen == 1) entry->SetFirst(0);
310 else entry->SetFirst((partArray->GetEntriesFast())+1);
312 gen->SetNumberParticles(npart);
314 entry->SetLast(partArray->GetEntriesFast());
320 // Testing primordial trigger: Single muons or dimuons with Pt above a Pt cut
321 // in the muon spectrometer acceptance
324 Int_t numberOfMuons=0;Int_t maxPart = partArray->GetEntriesFast();
325 for(iPart=0; iPart<maxPart; iPart++){
327 TParticle *part = gAlice->GetMCApp()->Particle(iPart);
328 if ( TMath::Abs(part->GetPdgCode()) == 13 ){
329 if((part->Vz() > fMuonOriginCut) && //take only the muons that decayed before the abs + 1 int. length in C abs
330 (part->Theta()*180./TMath::Pi()>fMuonThetaMinCut) &&
331 (part->Theta()*180./TMath::Pi()<fMuonThetaMaxCut) &&
332 (part->Pt()>fMuonPtCut) &&
333 (part->P()>fMuonPCut)) {
338 if (numberOfMuons >= fMuonMultiplicity) primordialTrigger = kTRUE;
342 // AliInfo(Form("Generated Events are %d and Succeeded Events are %d",fNGenerated,fNSucceded));
343 AliDebug(5,Form("Generated Events are %d and Succeeded Events are %d",fNGenerated,fNSucceded));