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103ac317 | 1 | /************************************************************************** |
2 | * Copyright(c) 1998-1999, ALICE Experiment at CERN, All rights reserved. * | |
3 | * * | |
4 | * Author: The ALICE Off-line Project. * | |
5 | * Contributors are mentioned in the code where appropriate. * | |
6 | * * | |
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 | **************************************************************************/ | |
15 | ||
16 | /* $Id$ */ | |
17 | ||
18 | // | |
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 | |
b44c3901 | 25 | // July 07:added heavy quark production from AliGenCorrHF and heavy quark |
26 | // production switched off in Pythia | |
103ac317 | 27 | |
28 | #include <TObjArray.h> | |
29 | #include <TParticle.h> | |
30 | #include <TF1.h> | |
aaa95f22 | 31 | #include <TVirtualMC.h> |
103ac317 | 32 | |
33 | #include "AliGenCocktailEventHeader.h" | |
34 | ||
35 | #include "AliGenCocktailEntry.h" | |
36 | #include "AliGenMUONCocktailpp.h" | |
37 | #include "AliGenMUONlib.h" | |
38 | #include "AliGenParam.h" | |
39 | #include "AliMC.h" | |
40 | #include "AliRun.h" | |
41 | #include "AliStack.h" | |
aaa95f22 | 42 | #include "AliDecayer.h" |
103ac317 | 43 | #include "AliLog.h" |
44 | #include "AliGenPythia.h" | |
b44c3901 | 45 | #include "AliGenCorrHF.h" |
103ac317 | 46 | |
47 | ClassImp(AliGenMUONCocktailpp) | |
48 | ||
49 | //________________________________________________________________________ | |
50 | AliGenMUONCocktailpp::AliGenMUONCocktailpp() | |
1c56e311 | 51 | :AliGenCocktail(), |
aaa95f22 | 52 | fDecayer(0), |
53 | fDecayModeResonance(kAll), | |
54 | fDecayModePythia(kAll), | |
1c56e311 | 55 | fTotalRate(0), |
56 | fMuonMultiplicity(0), | |
57 | fMuonPtCut(0.), | |
18bc0c8e | 58 | fMuonThetaMinCut(0.), |
1c56e311 | 59 | fMuonThetaMaxCut(0.), |
aaa95f22 | 60 | fMuonOriginCut(-999.), |
18bc0c8e | 61 | fNSucceded(0), |
1c56e311 | 62 | fNGenerated(0) |
103ac317 | 63 | { |
64 | // Constructor | |
103ac317 | 65 | } |
93a2041b | 66 | |
103ac317 | 67 | //_________________________________________________________________________ |
68 | AliGenMUONCocktailpp::~AliGenMUONCocktailpp() | |
69 | // Destructor | |
70 | { | |
71 | ||
72 | } | |
73 | ||
74 | //_________________________________________________________________________ | |
75 | void AliGenMUONCocktailpp::Init() | |
76 | { | |
77 | // MinBias NN cross section @ pp 14 TeV -PR Vol II p:473 | |
78 | Double_t sigmaReaction = 0.070; | |
79 | ||
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)); | |
89 | ||
90 | // Ratios with respect to the reaction cross-section in the | |
91 | // kinematics limit of the MUONCocktail | |
92 | Double_t ratiojpsi; | |
93 | Double_t ratiopsiP; | |
94 | Double_t ratioupsilon; | |
95 | Double_t ratioupsilonP; | |
96 | Double_t ratioupsilonPP; | |
b44c3901 | 97 | Double_t ratioccbar; |
98 | Double_t ratiobbbar; | |
99 | ||
18bc0c8e | 100 | // Cross sections in barns (from PPR Vol. II p: 552) pp - 14 TeV and |
101 | // corrected from feed down of higher resonances | |
103ac317 | 102 | |
18bc0c8e | 103 | Double_t sigmajpsi = 49.44e-6; |
103ac317 | 104 | Double_t sigmapsiP = 7.67e-6; |
18bc0c8e | 105 | Double_t sigmaupsilon = 0.989e-6; |
106 | Double_t sigmaupsilonP = 0.502e-6; | |
103ac317 | 107 | Double_t sigmaupsilonPP = 0.228e-6; |
b44c3901 | 108 | Double_t sigmaccbar = 11.2e-3; |
109 | Double_t sigmabbbar = 0.51e-3; | |
103ac317 | 110 | |
aaa95f22 | 111 | AliInfo(Form("the parametrised resonances uses the decay mode %d",fDecayModeResonance)); |
112 | ||
18bc0c8e | 113 | // Generation using CDF scaled distribution for pp@14TeV (from D. Stocco) |
114 | //---------------------------------------------------------------------- | |
103ac317 | 115 | // Jpsi generator |
18bc0c8e | 116 | AliGenParam * genjpsi = new AliGenParam(1, AliGenMUONlib::kJpsi, "CDF pp", "Jpsi"); |
103ac317 | 117 | // first step: generation in 4pi |
118 | genjpsi->SetPtRange(0.,100.); | |
119 | genjpsi->SetYRange(-8.,8.); | |
120 | genjpsi->SetPhiRange(0.,360.); | |
aaa95f22 | 121 | genjpsi->SetForceDecay(fDecayModeResonance); |
122 | if (!gMC) genjpsi->SetDecayer(fDecayer); | |
123 | ||
103ac317 | 124 | genjpsi->Init(); // generation in 4pi |
125 | ratiojpsi = sigmajpsi / sigmaReaction * genjpsi->GetRelativeArea(ptMin,ptMax,yMin,yMax,phiMin,phiMax); // get weight | |
126 | AliInfo(Form("jpsi prod. cross-section in pp(14 TeV) %5.3g b",sigmajpsi)); | |
127 | AliInfo(Form("jpsi prod. probability per collision in acceptance %5.3g",ratiojpsi)); | |
128 | // second step: generation in selected kinematical range | |
129 | genjpsi->SetPtRange(ptMin, ptMax); | |
130 | genjpsi->SetYRange(yMin, yMax); | |
131 | genjpsi->SetPhiRange(phiMin, phiMax); | |
132 | genjpsi->Init(); // generation in selected kinematic range | |
133 | AddGenerator(genjpsi, "Jpsi", ratiojpsi); // Adding Generator | |
134 | fTotalRate+=ratiojpsi; | |
135 | ||
136 | //------------------------------------------------------------------ | |
137 | // Psi prime generator | |
18bc0c8e | 138 | AliGenParam * genpsiP = new AliGenParam(1, AliGenMUONlib::kPsiP, "CDF pp", "PsiP"); |
103ac317 | 139 | // first step: generation in 4pi |
140 | genpsiP->SetPtRange(0.,100.); | |
141 | genpsiP->SetYRange(-8.,8.); | |
142 | genpsiP->SetPhiRange(0.,360.); | |
aaa95f22 | 143 | genpsiP->SetForceDecay(fDecayModeResonance); |
144 | if (!gMC) genpsiP->SetDecayer(fDecayer); | |
145 | ||
103ac317 | 146 | genpsiP->Init(); // generation in 4pi |
147 | ratiopsiP = sigmapsiP / sigmaReaction * genpsiP->GetRelativeArea(ptMin,ptMax,yMin,yMax,phiMin,phiMax); | |
148 | AliInfo(Form("psiP prod. cross-section in pp(14 TeV) %5.3g b",sigmapsiP)); | |
149 | AliInfo(Form("psiP prod. probability per collision in acceptance %5.3g",ratiopsiP)); | |
150 | // second step: generation in selected kinematical range | |
151 | genpsiP->SetPtRange(ptMin, ptMax); | |
152 | genpsiP->SetYRange(yMin, yMax); | |
153 | genpsiP->SetPhiRange(phiMin, phiMax); | |
154 | genpsiP->Init(); // generation in selected kinematic range | |
155 | AddGenerator(genpsiP, "PsiP", ratiopsiP); // Adding Generator | |
156 | fTotalRate+=ratiopsiP; | |
157 | ||
158 | //------------------------------------------------------------------ | |
159 | // Upsilon 1S generator | |
18bc0c8e | 160 | AliGenParam * genupsilon = new AliGenParam(1, AliGenMUONlib::kUpsilon, "CDF pp", "Upsilon"); |
103ac317 | 161 | // first step: generation in 4pi |
162 | genupsilon->SetPtRange(0.,100.); | |
163 | genupsilon->SetYRange(-8.,8.); | |
164 | genupsilon->SetPhiRange(0.,360.); | |
aaa95f22 | 165 | genupsilon->SetForceDecay(fDecayModeResonance); |
166 | if (!gMC) genupsilon->SetDecayer(fDecayer); | |
103ac317 | 167 | genupsilon->Init(); // generation in 4pi |
168 | ratioupsilon = sigmaupsilon / sigmaReaction * genupsilon->GetRelativeArea(ptMin,ptMax,yMin,yMax,phiMin,phiMax); | |
169 | AliInfo(Form("Upsilon 1S prod. cross-section in pp(14 TeV) %5.3g b",sigmaupsilon)); | |
170 | AliInfo(Form("Upsilon 1S prod. probability per collision in acceptance %5.3g",ratioupsilon)); | |
171 | // second step: generation in selected kinematical range | |
172 | genupsilon->SetPtRange(ptMin, ptMax); | |
173 | genupsilon->SetYRange(yMin, yMax); | |
174 | genupsilon->SetPhiRange(phiMin, phiMax); | |
175 | genupsilon->Init(); // generation in selected kinematical range | |
176 | AddGenerator(genupsilon,"Upsilon", ratioupsilon); // Adding Generator | |
177 | fTotalRate+=ratioupsilon; | |
178 | ||
179 | //------------------------------------------------------------------ | |
180 | // Upsilon 2S generator | |
18bc0c8e | 181 | AliGenParam * genupsilonP = new AliGenParam(1, AliGenMUONlib::kUpsilonP, "CDF pp", "UpsilonP"); |
103ac317 | 182 | // first step: generation in 4pi |
183 | genupsilonP->SetPtRange(0.,100.); | |
184 | genupsilonP->SetYRange(-8.,8.); | |
185 | genupsilonP->SetPhiRange(0.,360.); | |
aaa95f22 | 186 | genupsilonP->SetForceDecay(fDecayModeResonance); |
187 | if (!gMC) genupsilonP->SetDecayer(fDecayer); | |
103ac317 | 188 | genupsilonP->Init(); // generation in 4pi |
189 | ratioupsilonP = sigmaupsilonP / sigmaReaction * genupsilonP->GetRelativeArea(ptMin,ptMax,yMin,yMax,phiMin,phiMax); | |
190 | AliInfo(Form("Upsilon 2S prod. cross-section in pp(14 TeV) %5.3g b",sigmaupsilonP)); | |
191 | AliInfo(Form("Upsilon 2S prod. probability per collision in acceptance %5.3g",ratioupsilonP)); | |
192 | // second step: generation in the kinematical range | |
193 | genupsilonP->SetPtRange(ptMin, ptMax); | |
194 | genupsilonP->SetYRange(yMin, yMax); | |
195 | genupsilonP->SetPhiRange(phiMin, phiMax); | |
196 | genupsilonP->Init(); // generation in selected kinematical range | |
197 | AddGenerator(genupsilonP,"UpsilonP", ratioupsilonP); // Adding Generator | |
198 | fTotalRate+=ratioupsilonP; | |
199 | ||
200 | //------------------------------------------------------------------ | |
201 | // Upsilon 3S generator | |
18bc0c8e | 202 | AliGenParam * genupsilonPP = new AliGenParam(1, AliGenMUONlib::kUpsilonPP, "CDF pp", "UpsilonPP"); |
103ac317 | 203 | // first step: generation in 4pi |
204 | genupsilonPP->SetPtRange(0.,100.); | |
205 | genupsilonPP->SetYRange(-8.,8.); | |
206 | genupsilonPP->SetPhiRange(0.,360.); | |
aaa95f22 | 207 | genupsilonPP->SetForceDecay(fDecayModeResonance); |
208 | if (!gMC) genupsilonPP->SetDecayer(fDecayer); | |
103ac317 | 209 | genupsilonPP->Init(); // generation in 4pi |
210 | ratioupsilonPP = sigmaupsilonPP / sigmaReaction * genupsilonPP->GetRelativeArea(ptMin,ptMax,yMin,yMax,phiMin,phiMax); | |
211 | AliInfo(Form("Upsilon 3S prod. cross-section in pp(14 TeV) %5.3g b",sigmaupsilonPP)); | |
212 | AliInfo(Form("Upsilon 3S prod. probability per collision in acceptance %5.3g",ratioupsilonPP)); | |
213 | // second step: generation in selected kinematical range | |
214 | genupsilonPP->SetPtRange(ptMin, ptMax); | |
215 | genupsilonPP->SetYRange(yMin, yMax); | |
216 | genupsilonPP->SetPhiRange(phiMin, phiMax); | |
217 | genupsilonPP->Init(); // generation in selected kinematical range | |
218 | AddGenerator(genupsilonPP,"UpsilonPP", ratioupsilonPP); // Adding Generator | |
219 | fTotalRate+=ratioupsilonPP; | |
b44c3901 | 220 | |
221 | //------------------------------------------------------------------ | |
222 | // Generator of charm | |
223 | ||
224 | AliGenCorrHF *gencharm = new AliGenCorrHF(1, 4); | |
225 | gencharm->SetMomentumRange(0,9999); | |
226 | gencharm->SetForceDecay(kAll); | |
227 | ratioccbar = sigmaccbar/sigmaReaction; | |
228 | gencharm->Init(); | |
229 | AddGenerator(gencharm,"CorrHFCharm",ratioccbar); | |
230 | fTotalRate+=ratioccbar; | |
231 | ||
103ac317 | 232 | //------------------------------------------------------------------ |
b44c3901 | 233 | // Generator of beauty |
234 | ||
235 | AliGenCorrHF *genbeauty = new AliGenCorrHF(1, 5); | |
236 | genbeauty->SetMomentumRange(0,9999); | |
237 | genbeauty->SetForceDecay(kAll); | |
238 | ratiobbbar = sigmabbbar/sigmaReaction; | |
239 | genbeauty->Init(); | |
240 | AddGenerator(genbeauty,"CorrHFBeauty",ratiobbbar); | |
241 | fTotalRate+=ratiobbbar; | |
242 | ||
243 | //--------------------------t---------------------------------------- | |
103ac317 | 244 | // Pythia generator |
245 | AliGenPythia *pythia = new AliGenPythia(1); | |
246 | pythia->SetProcess(kPyMbMSEL1); | |
247 | pythia->SetStrucFunc(kCTEQ5L); | |
248 | pythia->SetEnergyCMS(14000.); | |
aaa95f22 | 249 | AliInfo(Form("\n\npythia uses the decay mode %d",fDecayModePythia)); |
250 | pythia->SetForceDecay(fDecayModePythia); | |
103ac317 | 251 | pythia->SetPtRange(0.,100.); |
252 | pythia->SetYRange(-8.,8.); | |
253 | pythia->SetPhiRange(0.,360.); | |
f58d19bb | 254 | pythia->SetPtHard(2.76,-1.0); |
b44c3901 | 255 | pythia->SwitchHFOff(); |
103ac317 | 256 | pythia->Init(); |
257 | AddGenerator(pythia,"Pythia",1); | |
258 | fTotalRate+=1.; | |
259 | ||
aaa95f22 | 260 | TIter next(fEntries); |
261 | AliGenCocktailEntry *entry; | |
262 | if (fStack) { | |
263 | while((entry = (AliGenCocktailEntry*)next())) { | |
264 | entry->Generator()->SetStack(fStack); | |
265 | } | |
266 | } | |
103ac317 | 267 | } |
268 | ||
269 | //_________________________________________________________________________ | |
270 | void AliGenMUONCocktailpp::Generate() | |
271 | { | |
272 | // Generate event | |
273 | TIter next(fEntries); | |
274 | AliGenCocktailEntry *entry = 0; | |
275 | AliGenCocktailEntry *preventry = 0; | |
276 | AliGenerator* gen = 0; | |
277 | ||
278 | TObjArray *partArray = gAlice->GetMCApp()->Particles(); | |
279 | ||
280 | // Generate the vertex position used by all generators | |
281 | if(fVertexSmear == kPerEvent) Vertex(); | |
282 | ||
283 | // Loop on primordialTrigger: | |
284 | // minimum muon multiplicity above a pt cut in a theta acceptance region | |
285 | ||
286 | Bool_t primordialTrigger = kFALSE; | |
287 | while(!primordialTrigger) { | |
288 | //Reseting stack | |
289 | AliRunLoader * runloader = gAlice->GetRunLoader(); | |
290 | if (runloader) | |
291 | if (runloader->Stack()) | |
34da8494 | 292 | runloader->Stack()->Clean(); |
103ac317 | 293 | // Loop over generators and generate events |
294 | Int_t igen = 0; | |
295 | Int_t npart = 0; | |
296 | const char* genName = 0; | |
297 | while((entry = (AliGenCocktailEntry*)next())) { | |
298 | gen = entry->Generator(); | |
299 | genName = entry->GetName(); | |
300 | gen->SetVertex(fVertex.At(0), fVertex.At(1), fVertex.At(2)); | |
301 | ||
302 | npart = (strcmp(genName,"Pythia") == 0) ? 1 : | |
303 | gRandom->Poisson(entry->Rate()); | |
304 | ||
305 | if (npart > 0) { | |
306 | igen++; | |
307 | if (igen == 1) entry->SetFirst(0); | |
308 | else entry->SetFirst((partArray->GetEntriesFast())+1); | |
309 | ||
310 | gen->SetNumberParticles(npart); | |
311 | gen->Generate(); | |
312 | entry->SetLast(partArray->GetEntriesFast()); | |
313 | preventry = entry; | |
314 | } | |
315 | } | |
316 | next.Reset(); | |
317 | ||
318 | // Testing primordial trigger: Single muons or dimuons with Pt above a Pt cut | |
319 | // in the muon spectrometer acceptance | |
320 | Int_t iPart; | |
321 | fNGenerated++; | |
b44c3901 | 322 | Int_t numberOfMuons=0;Int_t maxPart = partArray->GetEntriesFast(); |
aaa95f22 | 323 | for(iPart=0; iPart<maxPart; iPart++){ |
103ac317 | 324 | |
aaa95f22 | 325 | TParticle *part = gAlice->GetMCApp()->Particle(iPart); |
326 | if ( TMath::Abs(part->GetPdgCode()) == 13 ){ | |
327 | if((part->Vz() > fMuonOriginCut) && //take only the muons that decayed before the abs + 1 int. length in C abs | |
328 | (part->Theta()*180./TMath::Pi()>fMuonThetaMinCut) && | |
329 | (part->Theta()*180./TMath::Pi()<fMuonThetaMaxCut) && | |
330 | (part->Pt()>fMuonPtCut)) { | |
331 | numberOfMuons++; | |
103ac317 | 332 | } |
aaa95f22 | 333 | } |
334 | } | |
103ac317 | 335 | if (numberOfMuons >= fMuonMultiplicity) primordialTrigger = kTRUE; |
336 | } | |
337 | fNSucceded++; | |
338 | ||
aaa95f22 | 339 | // AliInfo(Form("Generated Events are %d and Succeeded Events are %d",fNGenerated,fNSucceded)); |
103ac317 | 340 | AliDebug(5,Form("Generated Events are %d and Succeeded Events are %d",fNGenerated,fNSucceded)); |
341 | } | |
342 | ||
343 |