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 // Class to create the coktail for physics with muons for pp collisions
20 // using the The followoing sources:
21 // jpsi, psiP, upsilon, upsilonP, upsilonPP, open charm and open beauty
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
28 // 2009: added possibility to hide x-sections (B. Vulpescu)
29 // 2009: added possibility to have the cocktail (fast generator and param.)
30 // for pp @ 10 TeV or pp @ 14 TeV (N. Bastid)
32 // 2009: added polarization (L. Bianchi)
34 // 11/2009: added chi_c1 & chi_c2 (P.Crochet & N.Bastid).
35 // Cross-sections for charmonia are now directly taken from the Yellow Report
36 // (hep-ph/0311048) Tab.9, page 19. See below for details w.r.t. beam energy.
37 // usage: see example of Config in $ALICE_ROOT/prod/LHC09a10/Config.C
38 //------------------------
40 // - CMS energy passed via parameter
41 // i.e. gener->SetCMSEnergy(AliGenMUONCocktailpp::kCMS07TeV) in Config.C
42 // - resonances now added to the cocktail via AddReso2Generator
44 // B.Vulpescu & P.Crochet
46 #include <TObjArray.h>
47 #include <TParticle.h>
49 #include <TVirtualMC.h>
50 #include "AliGenCocktailEventHeader.h"
52 #include "AliGenCocktailEntry.h"
53 #include "AliGenMUONCocktailpp.h"
54 #include "AliGenMUONlib.h"
55 #include "AliGenParam.h"
59 #include "AliDecayer.h"
61 #include "AliGenCorrHF.h"
62 #include "AliDecayerPolarized.h"
64 ClassImp(AliGenMUONCocktailpp)
66 //________________________________________________________________________
67 AliGenMUONCocktailpp::AliGenMUONCocktailpp()
70 fDecayModeResonance(kAll),
71 fDecayModePythia(kAll),
76 fMuonThetaMaxCut(180.),
77 fMuonOriginCut(-999.),
93 fSigmaReactionArray(),
103 fSigmaUpsilonArray(),
105 fSigmaUpsilonPArray(),
107 fSigmaUpsilonPPArray(),
117 // x-sections for pp @ 7 TeV: charmonia from hep-ph/0311048 Tab.9, page 19,
118 // bottomnium as for 10 TeV
119 fCMSEnergyTeVArray[0] = 7.00;
120 fSigmaReactionArray[0] = 0.0695;
121 fSigmaJPsiArray[0] = 21.8e-6;
122 fSigmaChic1Array[0] = 21.1e-6;
123 fSigmaChic2Array[0] = 34.9e-6;
124 fSigmaPsiPArray[0] = 4.93e-6;
125 fSigmaUpsilonArray[0] = 0.463e-6;
126 fSigmaUpsilonPArray[0] = 0.154e-6;
127 fSigmaUpsilonPPArray[0] = 0.0886e-6;
128 fSigmaCCbarArray[0] = 6.91e-3;
129 fSigmaBBbarArray[0] = 0.232e-3;
131 //x-sections for pp @ 10 TeV: charmonia and bottomonia from 14 TeV numbers
132 // scaled down according to ccbar and bbar cross-sections
133 fCMSEnergyTeVArray[1] = 10.00;
134 fSigmaReactionArray[1] = 0.0695;
135 fSigmaJPsiArray[1] = 26.06e-6;
136 fSigmaChic1Array[1] = 25.18e-6;
137 fSigmaChic2Array[1] = 41.58e-6;
138 fSigmaPsiPArray[1] = 5.88e-6;
139 fSigmaUpsilonArray[1] = 0.658e-6;
140 fSigmaUpsilonPArray[1] = 0.218e-6;
141 fSigmaUpsilonPPArray[1] = 0.122e-6;
142 fSigmaCCbarArray[1] = 8.9e-3;
143 fSigmaBBbarArray[1] = 0.33e-3;
145 //x-sections for pp @ 14 TeV: charmonia from hep-ph/0311048 Tab.9, page 19,
146 // bottomonium from hep-ph/0311048 Tab.9, page 19 taken inton account that
147 // feed-down from chib is included
148 fCMSEnergyTeVArray[2] = 14.00;
149 fSigmaReactionArray[2] = 0.070;
150 fSigmaJPsiArray[2] = 32.9e-6;
151 fSigmaChic1Array[2] = 31.8e-6;
152 fSigmaChic2Array[2] = 52.5e-6;
153 fSigmaPsiPArray[2] = 7.43e-6;
154 fSigmaUpsilonArray[2] = 0.989e-6;
155 fSigmaUpsilonPArray[2] = 0.502e-6;
156 fSigmaUpsilonPPArray[2] = 0.228e-6;
157 fSigmaCCbarArray[2] = 11.2e-3;
158 fSigmaBBbarArray[2] = 0.51e-3;
162 //_________________________________________________________________________
163 AliGenMUONCocktailpp::~AliGenMUONCocktailpp()
169 //_________________________________________________________________________
170 void AliGenMUONCocktailpp::SetCMSEnergy(CMSEnergyCode cmsEnergy)
172 // setter for CMSEnergy and corresponding cross-sections
173 fCMSEnergyTeV = fCMSEnergyTeVArray[cmsEnergy];
174 fSigmaReaction = fSigmaReactionArray[cmsEnergy];
175 fSigmaJPsi = fSigmaJPsiArray[cmsEnergy];
176 fSigmaChic1 = fSigmaChic1Array[cmsEnergy];
177 fSigmaChic2 = fSigmaChic2Array[cmsEnergy];
178 fSigmaPsiP = fSigmaPsiPArray[cmsEnergy];
179 fSigmaUpsilon = fSigmaUpsilonArray[cmsEnergy];
180 fSigmaUpsilonP = fSigmaUpsilonPArray[cmsEnergy];
181 fSigmaUpsilonPP = fSigmaUpsilonPPArray[cmsEnergy];
182 fSigmaCCbar = fSigmaCCbarArray[cmsEnergy];
183 fSigmaBBbar = fSigmaBBbarArray[cmsEnergy];
186 //_________________________________________________________________________
187 void AliGenMUONCocktailpp::SetResPolarization(Double_t JpsiPol, Double_t PsiPPol, Double_t UpsPol,
188 Double_t UpsPPol, Double_t UpsPPPol, char *PolFrame){
189 // setter for resonances polarization
190 if (strcmp(PolFrame,"kColSop")==0){
191 fJpsiPol = (JpsiPol>=-1 && JpsiPol<=1) ? JpsiPol : 0;
192 fPsiPPol = (PsiPPol>=-1 && PsiPPol<=1) ? PsiPPol : 0;
193 fUpsPol = (UpsPol>=-1 && UpsPol<=1) ? UpsPol : 0;
194 fUpsPPol = (UpsPPol>=-1 && UpsPPol<=1) ? UpsPPol : 0;
195 fUpsPPPol = (UpsPPPol>=-1 && UpsPPPol<=1) ? UpsPPPol : 0;
197 } else if (strcmp(PolFrame,"kHelicity")==0){
198 fJpsiPol = (JpsiPol>=-1 && JpsiPol<=1) ? JpsiPol : 0;
199 fPsiPPol = (PsiPPol>=-1 && PsiPPol<=1) ? PsiPPol : 0;
200 fUpsPol = (UpsPol>=-1 && UpsPol<=1) ? UpsPol : 0;
201 fUpsPPol = (UpsPPol>=-1 && UpsPPol<=1) ? UpsPPol : 0;
202 fUpsPPPol = (UpsPPPol>=-1 && UpsPPPol<=1) ? UpsPPPol : 0;
206 AliInfo(Form("The polarization frame is not valid"));
207 AliInfo(Form("No polarization will be set"));
216 //_________________________________________________________________________
217 void AliGenMUONCocktailpp::CreateCocktail()
219 // create and add resonances and open HF to the coctail
220 Int_t cmsEnergy = Int_t(fCMSEnergyTeV);
222 // These limits are only used for renormalization of quarkonia cross section
223 // Pythia events are generated in 4pi
224 Double_t ptMin = fPtMin;
225 Double_t ptMax = fPtMax;
226 Double_t yMin = fYMin;;
227 Double_t yMax = fYMax;;
228 Double_t phiMin = fPhiMin*180./TMath::Pi();
229 Double_t phiMax = fPhiMax*180./TMath::Pi();
230 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));
232 // Cross sections in barns (from PPR Vol. II p: 552) pp - 14 TeV and
233 // corrected from feed down of higher resonances
235 Double_t sigmajpsi = fSigmaJPsi;
236 Double_t sigmachic1 = fSigmaChic1;
237 Double_t sigmachic2 = fSigmaChic2;
238 Double_t sigmapsiP = fSigmaPsiP;
239 Double_t sigmaupsilon = fSigmaUpsilon;
240 Double_t sigmaupsilonP = fSigmaUpsilonP;
241 Double_t sigmaupsilonPP = fSigmaUpsilonPP;
242 Double_t sigmaccbar = fSigmaCCbar;
243 Double_t sigmabbbar = fSigmaBBbar;
245 // Cross sections corrected with the BR in mu+mu-
246 // (only in case of use of AliDecayerPolarized)
248 if(TMath::Abs(fJpsiPol) > 1.e-30) {sigmajpsi = fSigmaJPsi*0.0593;}
249 if(TMath::Abs(fChic1Pol) > 1.e-30) {sigmachic1 = fSigmaChic1*0.;} // tb consistent
250 if(TMath::Abs(fChic2Pol) > 1.e-30) {sigmachic2 = fSigmaChic2*0.;} // tb consistent
251 if(TMath::Abs(fPsiPPol) > 1.e-30) {sigmapsiP = fSigmaPsiP*0.0075;}
252 if(TMath::Abs(fUpsPol) > 1.e-30) {sigmaupsilon = fSigmaUpsilon*0.0248;}
253 if(TMath::Abs(fUpsPPol) > 1.e-30) {sigmaupsilonP = fSigmaUpsilonP*0.0193;}
254 if(TMath::Abs(fUpsPPPol) > 1.e-30) {sigmaupsilonPP = fSigmaUpsilonPP*0.0218;}
256 AliInfo(Form("the parametrised resonances uses the decay mode %d",fDecayModeResonance));
258 // Create and add resonances to the generator
259 AliGenParam * genjpsi=0;
260 AliGenParam * genchic1=0;
261 AliGenParam * genchic2=0;
262 AliGenParam * genpsiP=0;
263 AliGenParam * genupsilon=0;
264 AliGenParam * genupsilonP=0;
265 AliGenParam * genupsilonPP=0;
268 Char_t nameChic1[10];
269 Char_t nameChic2[10];
273 Char_t nameUpsPP[10];
275 snprintf(nameJpsi,10, "Jpsi");
276 snprintf(nameChic1,10, "Chic1");
277 snprintf(nameChic2,10, "Chic2");
278 snprintf(namePsiP,10, "PsiP");
279 snprintf(nameUps,10, "Ups");
280 snprintf(nameUpsP,10, "UpsP");
281 snprintf(nameUpsPP,10, "UpsPP");
284 genjpsi = new AliGenParam(1, AliGenMUONlib::kJpsi, "CDF pp 10", "Jpsi");
285 genchic1 = new AliGenParam(1, AliGenMUONlib::kChic1, "CDF pp 10", "Chic1");
286 genchic2 = new AliGenParam(1, AliGenMUONlib::kChic2, "CDF pp 10", "Chic2");
287 genpsiP = new AliGenParam(1, AliGenMUONlib::kPsiP, "CDF pp 10", "PsiP");
288 genupsilon = new AliGenParam(1, AliGenMUONlib::kUpsilon, "CDF pp 10", "Upsilon");
290 genupsilonP = new AliGenParam(1, AliGenMUONlib::kUpsilonP, "CDF pp 10", "UpsilonP");
291 genupsilonPP = new AliGenParam(1, AliGenMUONlib::kUpsilonPP, "CDF pp 10", "UpsilonPP");
292 } else if (cmsEnergy == 7){
293 genjpsi = new AliGenParam(1, AliGenMUONlib::kJpsi, "CDF pp 7", "Jpsi");
294 genchic1 = new AliGenParam(1, AliGenMUONlib::kChic1, "CDF pp 7", "Chic1");
295 genchic2 = new AliGenParam(1, AliGenMUONlib::kChic2, "CDF pp 7", "Chic2");
296 genpsiP = new AliGenParam(1, AliGenMUONlib::kPsiP, "CDF pp 7", "PsiP");
298 genupsilon = new AliGenParam(1, AliGenMUONlib::kUpsilon, "CDF pp 7", "Upsilon");
299 genupsilonP = new AliGenParam(1, AliGenMUONlib::kUpsilonP, "CDF pp 7", "UpsilonP");
300 genupsilonPP = new AliGenParam(1, AliGenMUONlib::kUpsilonPP, "CDF pp 7", "UpsilonPP");
301 } else if (cmsEnergy == 14){
302 genjpsi = new AliGenParam(1, AliGenMUONlib::kJpsi, "CDF pp ", "Jpsi");
303 genchic1 = new AliGenParam(1, AliGenMUONlib::kChic1, "CDF pp ", "Chic1");
304 genchic2 = new AliGenParam(1, AliGenMUONlib::kChic2, "CDF pp ", "Chic2");
305 genpsiP = new AliGenParam(1, AliGenMUONlib::kPsiP, "CDF pp", "PsiP");
307 genupsilon = new AliGenParam(1, AliGenMUONlib::kUpsilon, "CDF pp", "Upsilon");
308 genupsilonP = new AliGenParam(1, AliGenMUONlib::kUpsilonP, "CDF pp", "UpsilonP");
310 genupsilonPP = new AliGenParam(1, AliGenMUONlib::kUpsilonPP, "CDF pp", "UpsilonPP");
312 AliError("Initialisation failed");
317 AddReso2Generator(nameJpsi,genjpsi,sigmajpsi,fJpsiPol);
318 AddReso2Generator(nameChic1,genchic2,sigmachic1,fChic2Pol);
319 AddReso2Generator(nameChic2,genpsiP,sigmapsiP,fPsiPPol);
320 AddReso2Generator(namePsiP,genchic1,sigmachic1,fChic1Pol);
321 AddReso2Generator(nameUps,genupsilon,sigmaupsilon,fUpsPol);
322 AddReso2Generator(nameUpsP,genupsilonP,sigmaupsilonP,fUpsPPol);
323 AddReso2Generator(nameUpsPP,genupsilonPP,sigmaupsilonPP,fUpsPPPol);
325 //------------------------------------------------------------------
326 // Generator of charm
327 AliGenCorrHF *gencharm = new AliGenCorrHF(1, 4, cmsEnergy);
328 gencharm->SetMomentumRange(0,9999);
329 gencharm->SetForceDecay(kAll);
330 Double_t ratioccbar = sigmaccbar/fSigmaReaction;
331 if (!gMC) gencharm->SetDecayer(fDecayer);
334 AliInfo(Form("c-cbar prod. cross-section in pp %5.3g b",sigmaccbar));
335 AliInfo(Form("c-cbar prod. probability per collision in acceptance %5.3g",ratioccbar));
337 AddGenerator(gencharm,"CorrHFCharm",ratioccbar);
338 //------------------------------------------------------------------
339 // Generator of beauty
340 AliGenCorrHF *genbeauty = new AliGenCorrHF(1, 5, cmsEnergy);
341 genbeauty->SetMomentumRange(0,9999);
342 genbeauty->SetForceDecay(kAll);
343 Double_t ratiobbbar = sigmabbbar/fSigmaReaction;
344 if (!gMC) genbeauty->SetDecayer(fDecayer);
347 AliInfo(Form("b-bbar prod. cross-section in pp %5.3g b",sigmabbbar));
348 AliInfo(Form("b-bbar prod. probability per collision in acceptance %5.3g",ratiobbbar));
350 AddGenerator(genbeauty,"CorrHFBeauty",ratiobbbar);
352 //-------------------------------------------------------------------
355 // This has to go into the Config.C
357 // AliGenPythia *pythia = new AliGenPythia(1);
358 // pythia->SetProcess(kPyMbMSEL1);
359 // pythia->SetStrucFunc(kCTEQ5L);
360 // pythia->SetEnergyCMS(14000.);
361 // AliInfo(Form("\n\npythia uses the decay mode %d", GetDecayModePythia()));
362 // Decay_t dt = gener->GetDecayModePythia();
363 // pythia->SetForceDecay(dt);
364 // pythia->SetPtRange(0.,100.);
365 // pythia->SetYRange(-8.,8.);
366 // pythia->SetPhiRange(0.,360.);
367 // pythia->SetPtHard(2.76,-1.0);
368 // pythia->SwitchHFOff();
370 // AddGenerator(pythia,"Pythia",1);
374 //-------------------------------------------------------------------
375 void AliGenMUONCocktailpp::AddReso2Generator(Char_t* nameReso,
376 AliGenParam* const genReso,
380 // add resonances to the cocktail
381 Double_t phiMin = fPhiMin*180./TMath::Pi();
382 Double_t phiMax = fPhiMax*180./TMath::Pi();
384 // first step: generation in 4pi
385 genReso->SetPtRange(0.,100.);
386 genReso->SetYRange(-8.,8.);
387 genReso->SetPhiRange(0.,360.);
388 genReso->SetForceDecay(fDecayModeResonance);
389 if (!gMC) genReso->SetDecayer(fDecayer);
390 genReso->Init(); // generation in 4pi
391 // Ratios with respect to the reaction cross-section in the
392 // kinematics limit of the MUONCocktail
393 Double_t ratioReso = sigmaReso / fSigmaReaction * genReso->GetRelativeArea(fPtMin,fPtMax,fYMin,fYMax,phiMin,phiMax);
395 AliInfo(Form("%s prod. cross-section in pp %5.3g b",nameReso,sigmaReso));
396 AliInfo(Form("%s prod. probability per collision in acceptance %5.3g",nameReso,ratioReso));
398 // second step: generation in selected kinematical range
399 genReso->SetPtRange(fPtMin, fPtMax);
400 genReso->SetYRange(fYMin, fYMax);
401 genReso->SetPhiRange(phiMin, phiMax);
402 genReso->Init(); // generation in selected kinematical range
404 TVirtualMCDecayer *decReso = 0;
405 if(TMath::Abs(polReso) > 1.e-30){
406 AliInfo(Form("******Setting polarized decayer for %s''",nameReso));
408 decReso = new AliDecayerPolarized(polReso,AliDecayerPolarized::kColSop,AliDecayerPolarized::kMuon);
409 AliInfo(Form("******Reference frame: %s, alpha: %f","Collins-Soper",polReso));
412 decReso = new AliDecayerPolarized(polReso,AliDecayerPolarized::kHelicity,AliDecayerPolarized::kMuon);
413 AliInfo(Form("******Reference frame: %s, alpha: %f","Helicity",polReso));
416 decReso->SetForceDecay(kAll);
418 genReso->SetDecayer(decReso);
422 AddGenerator(genReso,nameReso,ratioReso); // Adding Generator
425 //-------------------------------------------------------------------
426 void AliGenMUONCocktailpp::Init()
429 TIter next(fEntries);
430 AliGenCocktailEntry *entry;
432 while((entry = (AliGenCocktailEntry*)next())) {
433 entry->Generator()->SetStack(fStack);
438 //_________________________________________________________________________
439 void AliGenMUONCocktailpp::Generate()
442 TIter next(fEntries);
443 AliGenCocktailEntry *entry = 0;
444 AliGenCocktailEntry *preventry = 0;
445 AliGenerator* gen = 0;
447 if (fHeader) delete fHeader;
448 fHeader = new AliGenCocktailEventHeader("MUON Cocktail Header");
450 const TObjArray *partArray = gAlice->GetMCApp()->Particles();
452 // Generate the vertex position used by all generators
453 if(fVertexSmear == kPerEvent) Vertex();
455 // Loop on primordialTrigger:
456 // minimum muon multiplicity above a pt cut in a theta acceptance region
458 Bool_t primordialTrigger = kFALSE;
459 while(!primordialTrigger) {
461 AliRunLoader * runloader = AliRunLoader::Instance();
463 if (runloader->Stack())
464 runloader->Stack()->Clean();
465 // Loop over generators and generate events
468 const char* genName = 0;
469 while((entry = (AliGenCocktailEntry*)next())) {
470 gen = entry->Generator();
471 genName = entry->GetName();
472 gen->SetVertex(fVertex.At(0), fVertex.At(1), fVertex.At(2));
475 npart = (strcmp(genName,"Pythia") == 0) ? 1 :
476 gRandom->Poisson(entry->Rate());
480 if (igen == 1) entry->SetFirst(0);
481 else entry->SetFirst((partArray->GetEntriesFast())+1);
483 gen->SetNumberParticles(npart);
485 entry->SetLast(partArray->GetEntriesFast());
492 // Testing primordial trigger: Single muons or dimuons with Pt above a Pt cut
493 // in the muon spectrometer acceptance
496 Int_t numberOfMuons=0;Int_t maxPart = partArray->GetEntriesFast();
497 for(iPart=0; iPart<maxPart; iPart++){
499 TParticle *part = gAlice->GetMCApp()->Particle(iPart);
500 if ( TMath::Abs(part->GetPdgCode()) == 13 ){
501 if((part->Vz() > fMuonOriginCut) && //take only the muons that decayed before the abs + 1 int. length in C abs
502 (part->Theta()*180./TMath::Pi()>fMuonThetaMinCut) &&
503 (part->Theta()*180./TMath::Pi()<fMuonThetaMaxCut) &&
504 (part->Pt()>fMuonPtCut) &&
505 (part->P()>fMuonPCut)) {
510 if (numberOfMuons >= fMuonMultiplicity) {
511 primordialTrigger = kTRUE;
512 fHeader->SetNProduced(maxPart);
520 for (Int_t j=0; j < 3; j++) eventVertex[j] = fVertex[j];
522 fHeader->SetPrimaryVertex(eventVertex);
523 fHeader->SetInteractionTime(fTime);
525 gAlice->SetGenEventHeader(fHeader);
527 // AliInfo(Form("Generated Events are %d and Succeeded Events are %d",fNGenerated,fNSucceded));
528 AliDebug(5,Form("Generated Events are %d and Succeeded Events are %d",fNGenerated,fNSucceded));