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.),
67 //_________________________________________________________________________
68 AliGenMUONCocktailpp::~AliGenMUONCocktailpp()
74 //_________________________________________________________________________
75 void AliGenMUONCocktailpp::CreateCocktail()
77 // MinBias NN cross section @ pp 14 TeV -PR Vol II p:473
78 Double_t sigmaReaction = 0.070;
80 // These limits are only used for renormalization of quarkonia cross section
81 // Pythia events are generated in 4pi
82 Double_t ptMin = fPtMin;
83 Double_t ptMax = fPtMax;
84 Double_t yMin = fYMin;;
85 Double_t yMax = fYMax;;
86 Double_t phiMin = fPhiMin*180./TMath::Pi();
87 Double_t phiMax = fPhiMax*180./TMath::Pi();
88 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));
90 // Ratios with respect to the reaction cross-section in the
91 // kinematics limit of the MUONCocktail
94 Double_t ratioupsilon;
95 Double_t ratioupsilonP;
96 Double_t ratioupsilonPP;
100 // Cross sections in barns (from PPR Vol. II p: 552) pp - 14 TeV and
101 // corrected from feed down of higher resonances
103 Double_t sigmajpsi = 49.44e-6;
104 Double_t sigmapsiP = 7.67e-6;
105 Double_t sigmaupsilon = 0.989e-6;
106 Double_t sigmaupsilonP = 0.502e-6;
107 Double_t sigmaupsilonPP = 0.228e-6;
108 Double_t sigmaccbar = 11.2e-3;
109 Double_t sigmabbbar = 0.51e-3;
111 Bool_t showSIGJPSI = kTRUE;
112 if (gSystem->Getenv("COCKTAIL_SIGJPSI")) {
113 sigmajpsi = atof(gSystem->Getenv("COCKTAIL_SIGJPSI"));
114 AliInfo("Cross-section for JPsi set from external value");
115 if (!gSystem->Getenv("COCKTAIL_SIGSHOW")) showSIGJPSI = kFALSE;
117 Bool_t showSIGPSIP = kTRUE;
118 if (gSystem->Getenv("COCKTAIL_SIGPSIP")) {
119 sigmapsiP = atof(gSystem->Getenv("COCKTAIL_SIGPSIP"));
120 AliInfo("Cross-section for Psi-prime set from external value");
121 if (!gSystem->Getenv("COCKTAIL_SIGSHOW")) showSIGPSIP = kFALSE;
123 Bool_t showSIGUPSI = kTRUE;
124 if (gSystem->Getenv("COCKTAIL_SIGUPSI")) {
125 sigmaupsilon = atof(gSystem->Getenv("COCKTAIL_SIGUPSI"));
126 AliInfo("Cross-section for Upsilon 1S set from external value");
127 if (!gSystem->Getenv("COCKTAIL_SIGSHOW")) showSIGUPSI = kFALSE;
129 Bool_t showSIGUPSIP = kTRUE;
130 if (gSystem->Getenv("COCKTAIL_SIGUPSIP")) {
131 sigmaupsilonP = atof(gSystem->Getenv("COCKTAIL_SIGUPSIP"));
132 AliInfo("Cross-section for Upsilon 2S set from external value");
133 if (!gSystem->Getenv("COCKTAIL_SIGSHOW")) showSIGUPSIP = kFALSE;
135 Bool_t showSIGUPSIPP = kTRUE;
136 if (gSystem->Getenv("COCKTAIL_SIGUPSIPP")) {
137 sigmaupsilonPP = atof(gSystem->Getenv("COCKTAIL_SIGUPSIPP"));
138 AliInfo("Cross-section for Upsilon 3S set from external value");
139 if (!gSystem->Getenv("COCKTAIL_SIGSHOW")) showSIGUPSIPP = kFALSE;
141 Bool_t showSIGCCBAR = kTRUE;
142 if (gSystem->Getenv("COCKTAIL_SIGCCBAR")) {
143 sigmaccbar = atof(gSystem->Getenv("COCKTAIL_SIGCCBAR"));
144 AliInfo("Cross-section for c-cbar set from external value");
145 if (!gSystem->Getenv("COCKTAIL_SIGSHOW")) showSIGCCBAR = kFALSE;
147 Bool_t showSIGBBBAR = kTRUE;
148 if (gSystem->Getenv("COCKTAIL_SIGBBBAR")) {
149 sigmabbbar = atof(gSystem->Getenv("COCKTAIL_SIGBBBAR"));
150 AliInfo("Cross-section for b-bbar set from external value");
151 if (!gSystem->Getenv("COCKTAIL_SIGSHOW")) showSIGBBBAR = kFALSE;
154 AliInfo(Form("the parametrised resonances uses the decay mode %d",fDecayModeResonance));
156 // Generation using CDF scaled distribution for pp@14TeV (from D. Stocco)
157 //----------------------------------------------------------------------
159 AliGenParam * genjpsi = new AliGenParam(1, AliGenMUONlib::kJpsi, "CDF pp", "Jpsi");
160 // first step: generation in 4pi
161 genjpsi->SetPtRange(0.,100.);
162 genjpsi->SetYRange(-8.,8.);
163 genjpsi->SetPhiRange(0.,360.);
164 genjpsi->SetForceDecay(fDecayModeResonance);
165 if (!gMC) genjpsi->SetDecayer(fDecayer);
167 genjpsi->Init(); // generation in 4pi
168 ratiojpsi = sigmajpsi / sigmaReaction * genjpsi->GetRelativeArea(ptMin,ptMax,yMin,yMax,phiMin,phiMax); // get weight
170 AliInfo(Form("jpsi prod. cross-section in pp(14 TeV) %5.3g b",sigmajpsi));
171 AliInfo(Form("jpsi prod. probability per collision in acceptance %5.3g",ratiojpsi));
173 // second step: generation in selected kinematical range
174 genjpsi->SetPtRange(ptMin, ptMax);
175 genjpsi->SetYRange(yMin, yMax);
176 genjpsi->SetPhiRange(phiMin, phiMax);
177 genjpsi->Init(); // generation in selected kinematic range
178 AddGenerator(genjpsi, "Jpsi", ratiojpsi); // Adding Generator
179 //------------------------------------------------------------------
180 // Psi prime generator
181 AliGenParam * genpsiP = new AliGenParam(1, AliGenMUONlib::kPsiP, "CDF pp", "PsiP");
182 // first step: generation in 4pi
183 genpsiP->SetPtRange(0.,100.);
184 genpsiP->SetYRange(-8.,8.);
185 genpsiP->SetPhiRange(0.,360.);
186 genpsiP->SetForceDecay(fDecayModeResonance);
187 if (!gMC) genpsiP->SetDecayer(fDecayer);
189 genpsiP->Init(); // generation in 4pi
190 ratiopsiP = sigmapsiP / sigmaReaction * genpsiP->GetRelativeArea(ptMin,ptMax,yMin,yMax,phiMin,phiMax);
192 AliInfo(Form("psiP prod. cross-section in pp(14 TeV) %5.3g b",sigmapsiP));
193 AliInfo(Form("psiP prod. probability per collision in acceptance %5.3g",ratiopsiP));
195 // second step: generation in selected kinematical range
196 genpsiP->SetPtRange(ptMin, ptMax);
197 genpsiP->SetYRange(yMin, yMax);
198 genpsiP->SetPhiRange(phiMin, phiMax);
199 genpsiP->Init(); // generation in selected kinematic range
200 AddGenerator(genpsiP, "PsiP", ratiopsiP); // Adding Generator
201 //------------------------------------------------------------------
202 // Upsilon 1S generator
203 AliGenParam * genupsilon = new AliGenParam(1, AliGenMUONlib::kUpsilon, "CDF pp", "Upsilon");
204 // first step: generation in 4pi
205 genupsilon->SetPtRange(0.,100.);
206 genupsilon->SetYRange(-8.,8.);
207 genupsilon->SetPhiRange(0.,360.);
208 genupsilon->SetForceDecay(fDecayModeResonance);
209 if (!gMC) genupsilon->SetDecayer(fDecayer);
210 genupsilon->Init(); // generation in 4pi
211 ratioupsilon = sigmaupsilon / sigmaReaction * genupsilon->GetRelativeArea(ptMin,ptMax,yMin,yMax,phiMin,phiMax);
213 AliInfo(Form("Upsilon 1S prod. cross-section in pp(14 TeV) %5.3g b",sigmaupsilon));
214 AliInfo(Form("Upsilon 1S prod. probability per collision in acceptance %5.3g",ratioupsilon));
216 // second step: generation in selected kinematical range
217 genupsilon->SetPtRange(ptMin, ptMax);
218 genupsilon->SetYRange(yMin, yMax);
219 genupsilon->SetPhiRange(phiMin, phiMax);
220 genupsilon->Init(); // generation in selected kinematical range
221 AddGenerator(genupsilon,"Upsilon", ratioupsilon); // Adding Generator
222 //------------------------------------------------------------------
223 // Upsilon 2S generator
224 AliGenParam * genupsilonP = new AliGenParam(1, AliGenMUONlib::kUpsilonP, "CDF pp", "UpsilonP");
225 // first step: generation in 4pi
226 genupsilonP->SetPtRange(0.,100.);
227 genupsilonP->SetYRange(-8.,8.);
228 genupsilonP->SetPhiRange(0.,360.);
229 genupsilonP->SetForceDecay(fDecayModeResonance);
230 if (!gMC) genupsilonP->SetDecayer(fDecayer);
231 genupsilonP->Init(); // generation in 4pi
232 ratioupsilonP = sigmaupsilonP / sigmaReaction * genupsilonP->GetRelativeArea(ptMin,ptMax,yMin,yMax,phiMin,phiMax);
234 AliInfo(Form("Upsilon 2S prod. cross-section in pp(14 TeV) %5.3g b",sigmaupsilonP));
235 AliInfo(Form("Upsilon 2S prod. probability per collision in acceptance %5.3g",ratioupsilonP));
237 // second step: generation in the kinematical range
238 genupsilonP->SetPtRange(ptMin, ptMax);
239 genupsilonP->SetYRange(yMin, yMax);
240 genupsilonP->SetPhiRange(phiMin, phiMax);
241 genupsilonP->Init(); // generation in selected kinematical range
242 AddGenerator(genupsilonP,"UpsilonP", ratioupsilonP); // Adding Generator
244 //------------------------------------------------------------------
245 // Upsilon 3S generator
246 AliGenParam * genupsilonPP = new AliGenParam(1, AliGenMUONlib::kUpsilonPP, "CDF pp", "UpsilonPP");
247 // first step: generation in 4pi
248 genupsilonPP->SetPtRange(0.,100.);
249 genupsilonPP->SetYRange(-8.,8.);
250 genupsilonPP->SetPhiRange(0.,360.);
251 genupsilonPP->SetForceDecay(fDecayModeResonance);
252 if (!gMC) genupsilonPP->SetDecayer(fDecayer);
253 genupsilonPP->Init(); // generation in 4pi
254 ratioupsilonPP = sigmaupsilonPP / sigmaReaction * genupsilonPP->GetRelativeArea(ptMin,ptMax,yMin,yMax,phiMin,phiMax);
256 AliInfo(Form("Upsilon 3S prod. cross-section in pp(14 TeV) %5.3g b",sigmaupsilonPP));
257 AliInfo(Form("Upsilon 3S prod. probability per collision in acceptance %5.3g",ratioupsilonPP));
259 // second step: generation in selected kinematical range
260 genupsilonPP->SetPtRange(ptMin, ptMax);
261 genupsilonPP->SetYRange(yMin, yMax);
262 genupsilonPP->SetPhiRange(phiMin, phiMax);
263 genupsilonPP->Init(); // generation in selected kinematical range
264 AddGenerator(genupsilonPP,"UpsilonPP", ratioupsilonPP); // Adding Generator
266 //------------------------------------------------------------------
267 // Generator of charm
269 AliGenCorrHF *gencharm = new AliGenCorrHF(1, 4);
270 gencharm->SetMomentumRange(0,9999);
271 gencharm->SetForceDecay(kAll);
272 ratioccbar = sigmaccbar/sigmaReaction;
273 if (!gMC) gencharm->SetDecayer(fDecayer);
276 AliInfo(Form("c-cbar prod. cross-section in pp(14 TeV) %5.3g b",sigmaccbar));
277 AliInfo(Form("c-cbar prod. probability per collision in acceptance %5.3g",ratioccbar));
279 AddGenerator(gencharm,"CorrHFCharm",ratioccbar);
281 //------------------------------------------------------------------
282 // Generator of beauty
284 AliGenCorrHF *genbeauty = new AliGenCorrHF(1, 5);
285 genbeauty->SetMomentumRange(0,9999);
286 genbeauty->SetForceDecay(kAll);
287 ratiobbbar = sigmabbbar/sigmaReaction;
288 if (!gMC) genbeauty->SetDecayer(fDecayer);
291 AliInfo(Form("b-bbar prod. cross-section in pp(14 TeV) %5.3g b",sigmabbbar));
292 AliInfo(Form("b-bbar prod. probability per collision in acceptance %5.3g",ratiobbbar));
294 AddGenerator(genbeauty,"CorrHFBeauty",ratiobbbar);
296 //-------------------------------------------------------------------
299 // This has to go into the Config.C
301 // AliGenPythia *pythia = new AliGenPythia(1);
302 // pythia->SetProcess(kPyMbMSEL1);
303 // pythia->SetStrucFunc(kCTEQ5L);
304 // pythia->SetEnergyCMS(14000.);
305 // AliInfo(Form("\n\npythia uses the decay mode %d", GetDecayModePythia()));
306 // Decay_t dt = gener->GetDecayModePythia();
307 // pythia->SetForceDecay(dt);
308 // pythia->SetPtRange(0.,100.);
309 // pythia->SetYRange(-8.,8.);
310 // pythia->SetPhiRange(0.,360.);
311 // pythia->SetPtHard(2.76,-1.0);
312 // pythia->SwitchHFOff();
314 // AddGenerator(pythia,"Pythia",1);
317 void AliGenMUONCocktailpp::Init()
321 TIter next(fEntries);
322 AliGenCocktailEntry *entry;
324 while((entry = (AliGenCocktailEntry*)next())) {
325 entry->Generator()->SetStack(fStack);
330 //_________________________________________________________________________
331 void AliGenMUONCocktailpp::Generate()
334 TIter next(fEntries);
335 AliGenCocktailEntry *entry = 0;
336 AliGenCocktailEntry *preventry = 0;
337 AliGenerator* gen = 0;
339 const TObjArray *partArray = gAlice->GetMCApp()->Particles();
341 // Generate the vertex position used by all generators
342 if(fVertexSmear == kPerEvent) Vertex();
344 // Loop on primordialTrigger:
345 // minimum muon multiplicity above a pt cut in a theta acceptance region
347 Bool_t primordialTrigger = kFALSE;
348 while(!primordialTrigger) {
350 AliRunLoader * runloader = AliRunLoader::Instance();
352 if (runloader->Stack())
353 runloader->Stack()->Clean();
354 // Loop over generators and generate events
357 const char* genName = 0;
358 while((entry = (AliGenCocktailEntry*)next())) {
359 gen = entry->Generator();
360 genName = entry->GetName();
361 gen->SetVertex(fVertex.At(0), fVertex.At(1), fVertex.At(2));
363 npart = (strcmp(genName,"Pythia") == 0) ? 1 :
364 gRandom->Poisson(entry->Rate());
368 if (igen == 1) entry->SetFirst(0);
369 else entry->SetFirst((partArray->GetEntriesFast())+1);
371 gen->SetNumberParticles(npart);
373 entry->SetLast(partArray->GetEntriesFast());
379 // Testing primordial trigger: Single muons or dimuons with Pt above a Pt cut
380 // in the muon spectrometer acceptance
383 Int_t numberOfMuons=0;Int_t maxPart = partArray->GetEntriesFast();
384 for(iPart=0; iPart<maxPart; iPart++){
386 TParticle *part = gAlice->GetMCApp()->Particle(iPart);
387 if ( TMath::Abs(part->GetPdgCode()) == 13 ){
388 if((part->Vz() > fMuonOriginCut) && //take only the muons that decayed before the abs + 1 int. length in C abs
389 (part->Theta()*180./TMath::Pi()>fMuonThetaMinCut) &&
390 (part->Theta()*180./TMath::Pi()<fMuonThetaMaxCut) &&
391 (part->Pt()>fMuonPtCut) &&
392 (part->P()>fMuonPCut)) {
397 if (numberOfMuons >= fMuonMultiplicity) primordialTrigger = kTRUE;
401 // AliInfo(Form("Generated Events are %d and Succeeded Events are %d",fNGenerated,fNSucceded));
402 AliDebug(5,Form("Generated Events are %d and Succeeded Events are %d",fNGenerated,fNSucceded));