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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 | |
25 | // | |
26 | ||
27 | #include <TObjArray.h> | |
28 | #include <TParticle.h> | |
29 | #include <TF1.h> | |
30 | ||
31 | #include "AliGenCocktailEventHeader.h" | |
32 | ||
33 | #include "AliGenCocktailEntry.h" | |
34 | #include "AliGenMUONCocktailpp.h" | |
35 | #include "AliGenMUONlib.h" | |
36 | #include "AliGenParam.h" | |
37 | #include "AliMC.h" | |
38 | #include "AliRun.h" | |
39 | #include "AliStack.h" | |
40 | #include "AliLog.h" | |
41 | #include "AliGenPythia.h" | |
42 | ||
43 | ||
44 | ClassImp(AliGenMUONCocktailpp) | |
45 | ||
46 | //________________________________________________________________________ | |
47 | AliGenMUONCocktailpp::AliGenMUONCocktailpp() | |
48 | :AliGenCocktail() | |
49 | { | |
50 | // Constructor | |
51 | fTotalRate =0; | |
52 | fNSucceded=0; | |
53 | fNGenerated=0; | |
54 | fMuonMultiplicity=0; | |
55 | fMuonPtCut= 0.; | |
56 | fMuonThetaMinCut=0.; | |
57 | fMuonThetaMaxCut=0.; | |
58 | } | |
59 | //_________________________________________________________________________ | |
60 | AliGenMUONCocktailpp::AliGenMUONCocktailpp(const AliGenMUONCocktailpp & cocktail): | |
61 | AliGenCocktail(cocktail) | |
62 | { | |
63 | // Copy constructor | |
64 | fTotalRate =0; | |
65 | fNSucceded=0; | |
66 | fNGenerated=0; | |
67 | fMuonMultiplicity=0; | |
68 | fMuonPtCut=0.; | |
69 | fMuonThetaMinCut=0.; | |
70 | fMuonThetaMaxCut=0.; | |
71 | } | |
72 | //_________________________________________________________________________ | |
73 | AliGenMUONCocktailpp::~AliGenMUONCocktailpp() | |
74 | // Destructor | |
75 | { | |
76 | ||
77 | } | |
78 | ||
79 | //_________________________________________________________________________ | |
80 | void AliGenMUONCocktailpp::Init() | |
81 | { | |
82 | // MinBias NN cross section @ pp 14 TeV -PR Vol II p:473 | |
83 | Double_t sigmaReaction = 0.070; | |
84 | ||
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)); | |
94 | ||
95 | // Ratios with respect to the reaction cross-section in the | |
96 | // kinematics limit of the MUONCocktail | |
97 | Double_t ratiojpsi; | |
98 | Double_t ratiopsiP; | |
99 | Double_t ratioupsilon; | |
100 | Double_t ratioupsilonP; | |
101 | Double_t ratioupsilonPP; | |
102 | ||
103 | // Cross sections in barns (from PPR Vol. II p: 552) pp - 14 TeV | |
104 | ||
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; | |
110 | ||
111 | // Generation using CDF scaled distribution | |
112 | //(See http://clrwww.in2p3.fr/DIMUON2004/talks/sgrigoryan.pdf ) | |
113 | ||
114 | //------------------------------------------------------------------ | |
115 | // Jpsi generator | |
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; | |
133 | ||
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; | |
153 | ||
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; | |
173 | ||
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; | |
193 | ||
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; | |
213 | ||
214 | //------------------------------------------------------------------ | |
215 | // Pythia generator | |
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.); | |
f58d19bb | 224 | pythia->SetPtHard(2.76,-1.0); |
103ac317 | 225 | pythia->Init(); |
226 | AddGenerator(pythia,"Pythia",1); | |
227 | fTotalRate+=1.; | |
228 | ||
229 | } | |
230 | ||
231 | //_________________________________________________________________________ | |
232 | void AliGenMUONCocktailpp::Generate() | |
233 | { | |
234 | // Generate event | |
235 | TIter next(fEntries); | |
236 | AliGenCocktailEntry *entry = 0; | |
237 | AliGenCocktailEntry *preventry = 0; | |
238 | AliGenerator* gen = 0; | |
239 | ||
240 | TObjArray *partArray = gAlice->GetMCApp()->Particles(); | |
241 | ||
242 | // Generate the vertex position used by all generators | |
243 | if(fVertexSmear == kPerEvent) Vertex(); | |
244 | ||
245 | // Loop on primordialTrigger: | |
246 | // minimum muon multiplicity above a pt cut in a theta acceptance region | |
247 | ||
248 | Bool_t primordialTrigger = kFALSE; | |
249 | while(!primordialTrigger) { | |
250 | //Reseting stack | |
251 | AliRunLoader * runloader = gAlice->GetRunLoader(); | |
252 | if (runloader) | |
253 | if (runloader->Stack()) | |
254 | runloader->Stack()->Reset(); | |
255 | // Loop over generators and generate events | |
256 | Int_t igen = 0; | |
257 | Int_t npart = 0; | |
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)); | |
263 | ||
264 | npart = (strcmp(genName,"Pythia") == 0) ? 1 : | |
265 | gRandom->Poisson(entry->Rate()); | |
266 | ||
267 | if (npart > 0) { | |
268 | igen++; | |
269 | if (igen == 1) entry->SetFirst(0); | |
270 | else entry->SetFirst((partArray->GetEntriesFast())+1); | |
271 | ||
272 | gen->SetNumberParticles(npart); | |
273 | gen->Generate(); | |
274 | entry->SetLast(partArray->GetEntriesFast()); | |
275 | preventry = entry; | |
276 | } | |
277 | } | |
278 | next.Reset(); | |
279 | ||
280 | // Testing primordial trigger: Single muons or dimuons with Pt above a Pt cut | |
281 | // in the muon spectrometer acceptance | |
282 | Int_t iPart; | |
283 | fNGenerated++; | |
284 | Int_t numberOfMuons=0; | |
285 | ||
286 | for(iPart=0; iPart<partArray->GetEntriesFast(); iPart++){ | |
287 | ||
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) ) { | |
292 | ||
293 | numberOfMuons++; | |
294 | } | |
295 | } | |
296 | ||
297 | if (numberOfMuons >= fMuonMultiplicity) primordialTrigger = kTRUE; | |
298 | } | |
299 | fNSucceded++; | |
300 | ||
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)); | |
303 | } | |
304 | ||
305 |