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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
45 //-----------------------
47 // - added the cocktail for p-Pb & Pb-p @ 8.8 TeV with 4 centrality bins and
48 // for Pb-Pb @ 2.76 TeV with 11 centrality bins. Bins should be defined also
49 // in the Config.C with one AliGenMUONCocktailpp per bin. These generators
50 // included in a AliGenCocktail together with an event generator (e.g. Hijing)
51 // providing the underlying event and collision centrality. The bin number n
52 // passed via AliGenMUONCocktailpp::SetCentralityBin(n).
53 // See details in my presentation at the PWG3-Muon meeting (05.10.2011):
54 // https://indico.cern.ch/conferenceDisplay.py?confId=157367
55 // - simplifications and bug fix in CreateCocktail()
57 //-----------------------
59 // - added the cocktail for p-Pb & Pb-p @ 2.76, 4.4 & 5.03 TeV with 4 centrality
60 // bins, using the EPS09-LO shadowing computed for 5.03 TeV. Energies are set by
61 // AliGenMUONCocktailpp::SetCMSEnergy(int CMSEnergyCode), CMSEnergy codes are
62 // defined in AliGenMUONCocktailpp.h.
63 // - added functions to scale x-section of JPsi, Charmonia, Bottomonia, CCbar & BBbar
64 // in Config.C to manage the statistics. Example of usage (in a cocktail with Hijing):
66 AliGenCocktail *cocktail = new AliGenCocktail();
67 cocktail->AddGenerator(hijing,"hijing",1);
68 TFormula *form[nb]; // nb - number of centrality bins with impact params bBins[i]
69 AliGenMUONCocktailpp *gen[nb];
70 for (Int_t i=0; i<nb; i++) {
71 form[i] = new TFormula(Form("f%d",i),"[0]+(x-[1])/([2]-[1])");
72 form[i]->SetParameters(i+1, bBins[i], bBins[i+1]);
73 gen[i] = MuonCocktail();
74 gen[i]->SetCentralityBin(i+1);
75 gen[i]->ScaleJPsi(100.);
76 gen[i]->CreateCocktail();
77 cocktail->AddGenerator(gen[i], Form("g%d",i), 101+i, form[i]);
79 AliGenMUONCocktailpp* MuonCocktail() {
80 AliGenMUONCocktailpp *mc = new AliGenMUONCocktailpp();
81 ....................................
85 // - a bug fixed in the function Generate()
88 #include <TObjArray.h>
89 #include <TParticle.h>
91 #include <TVirtualMC.h>
92 #include "AliGenCocktailEventHeader.h"
94 #include "AliGenCocktailEntry.h"
95 #include "AliGenMUONCocktailpp.h"
96 #include "AliGenMUONlib.h"
97 #include "AliGenParam.h"
100 #include "AliStack.h"
101 #include "AliDecayer.h"
103 #include "AliGenCorrHF.h"
104 #include "AliDecayerPolarized.h"
106 ClassImp(AliGenMUONCocktailpp)
108 //________________________________________________________________________
109 AliGenMUONCocktailpp::AliGenMUONCocktailpp()
112 fDecayModeResonance(kAll),
113 fDecayModePythia(kAll),
114 fMuonMultiplicity(0),
117 fMuonThetaMinCut(0.),
118 fMuonThetaMaxCut(180.),
119 fMuonOriginCut(-999.),
139 fCMSEnergyTeVArray(),
141 fSigmaReactionArray(),
151 fSigmaUpsilonArray(),
153 fSigmaUpsilonPArray(),
155 fSigmaUpsilonPPArray(),
165 // x-sections for pp @ 7 TeV:
166 // -charmonia: 4pi integral of fit function for inclusive J/psi dsigma/dy LHC data
167 // gives 60 mub; so sigma_prompt = 54 mub, while Ref = R.Vogt_arXiv:1003.3497 (Table 2)
168 // gives 35 mub. Below we use sigma_direct from the Ref scaled by the factor 54/35.
169 // -bottomonia: 4pi integral of fit function for inclusive Upsilon1S dsigma/dy LHC data
170 // gives 0.56 mub, sigmas for 2S & 3S obtained using LHCb data for ratios 2S/1S & 3S/1S
171 // -ccbar & bbbar: NLO pQCD computations - http://www-alice.gsi.de/ana/MNR/results.html
172 fCMSEnergyTeVArray[0] = 7.00;
173 fSigmaReactionArray[0] = 0.070;
174 fSigmaJPsiArray[0] = 33.6e-6;
175 fSigmaChic1Array[0] = 32.6e-6;
176 fSigmaChic2Array[0] = 53.8e-6;
177 fSigmaPsiPArray[0] = 7.6e-6;
178 fSigmaUpsilonArray[0] = 0.56e-6;
179 fSigmaUpsilonPArray[0] = 0.18e-6;
180 fSigmaUpsilonPPArray[0] = 0.08e-6;
181 fSigmaCCbarArray[0] = 6.91e-3;
182 fSigmaBBbarArray[0] = 0.232e-3;
184 //x-sections for pp @ 10 TeV: charmonia and bottomonia from 14 TeV numbers
185 // scaled down according to ccbar and bbbar cross-sections
186 fCMSEnergyTeVArray[1] = 10.00;
187 fSigmaReactionArray[1] = 0.070;
188 fSigmaJPsiArray[1] = 26.06e-6;
189 fSigmaChic1Array[1] = 25.18e-6;
190 fSigmaChic2Array[1] = 41.58e-6;
191 fSigmaPsiPArray[1] = 5.88e-6;
192 fSigmaUpsilonArray[1] = 0.658e-6;
193 fSigmaUpsilonPArray[1] = 0.218e-6;
194 fSigmaUpsilonPPArray[1] = 0.122e-6;
195 fSigmaCCbarArray[1] = 8.9e-3;
196 fSigmaBBbarArray[1] = 0.33e-3;
198 //x-sections for pp @ 14 TeV: charmonia from hep-ph/0311048 Tab.9, page 19,
199 // bottomonium from hep-ph/0311048 Tab.9, page 19 taken into account that
200 // feed-down from chib is included
201 fCMSEnergyTeVArray[2] = 14.00;
202 fSigmaReactionArray[2] = 0.070;
203 fSigmaJPsiArray[2] = 32.9e-6;
204 fSigmaChic1Array[2] = 31.8e-6;
205 fSigmaChic2Array[2] = 52.5e-6;
206 fSigmaPsiPArray[2] = 7.43e-6;
207 fSigmaUpsilonArray[2] = 0.989e-6;
208 fSigmaUpsilonPArray[2] = 0.502e-6;
209 fSigmaUpsilonPPArray[2] = 0.228e-6;
210 fSigmaCCbarArray[2] = 11.2e-3;
211 fSigmaBBbarArray[2] = 0.445e-3;
213 // x-sections for Min. Bias p-Pb & Pb-p @ 2.76 TeV: charmonia and bottomonia
214 // from 7 TeV numbers scaled according to pQCD ccbar and bbbar x-sections
215 // and with Glauber scaling
216 fCMSEnergyTeVArray[3] = 2.00; // for 2.76 TeV
217 fSigmaReactionArray[3] = 2.10;
218 fSigmaJPsiArray[3] = 3.54e-3; // 208*0.507*33.6e-6
219 fSigmaChic1Array[3] = 3.44e-3;
220 fSigmaChic2Array[3] = 5.66e-3;
221 fSigmaPsiPArray[3] = 0.80e-3;
222 fSigmaUpsilonArray[3] = 0.045e-3; // 208*0.384*0.56e-6
223 fSigmaUpsilonPArray[3] = 0.014e-3;
224 fSigmaUpsilonPPArray[3] = 0.006e-3;
225 fSigmaCCbarArray[3] = 0.73; // 208*3.50e-3
226 fSigmaBBbarArray[3] = 0.019; // 208*0.089e-3
228 fCMSEnergyTeVArray[4] = -fCMSEnergyTeVArray[3];
229 fSigmaReactionArray[4] = fSigmaReactionArray[3];
230 fSigmaJPsiArray[4] = fSigmaJPsiArray[3];
231 fSigmaChic1Array[4] = fSigmaChic1Array[3];
232 fSigmaChic2Array[4] = fSigmaChic2Array[3];
233 fSigmaPsiPArray[4] = fSigmaPsiPArray[3];
234 fSigmaUpsilonArray[4] = fSigmaUpsilonArray[3];
235 fSigmaUpsilonPArray[4] = fSigmaUpsilonPArray[3];
236 fSigmaUpsilonPPArray[4] = fSigmaUpsilonPPArray[3];
237 fSigmaCCbarArray[4] = fSigmaCCbarArray[3];
238 fSigmaBBbarArray[4] = fSigmaBBbarArray[3];
240 // x-sections for Min. Bias p-Pb & Pb-p @ 4.4 TeV: charmonia and bottomonia
241 // from 7 TeV numbers scaled according to pQCD ccbar and bbbar x-sections
242 // and with Glauber scaling
243 fCMSEnergyTeVArray[5] = 4.00; // for 4.4 TeV
244 fSigmaReactionArray[5] = 2.10;
245 fSigmaJPsiArray[5] = 5.00e-3; // 208*0.715*33.6e-6
246 fSigmaChic1Array[5] = 4.86e-3;
247 fSigmaChic2Array[5] = 7.99e-3;
248 fSigmaPsiPArray[5] = 1.12e-3;
249 fSigmaUpsilonArray[5] = 0.074e-3; // 208*0.629*0.56e-6
250 fSigmaUpsilonPArray[5] = 0.023e-3;
251 fSigmaUpsilonPPArray[5] = 0.010e-3;
252 fSigmaCCbarArray[5] = 1.03; // 208*4.94e-3
253 fSigmaBBbarArray[5] = 0.030; // 208*0.146e-3
255 fCMSEnergyTeVArray[6] = -fCMSEnergyTeVArray[5];
256 fSigmaReactionArray[6] = fSigmaReactionArray[5];
257 fSigmaJPsiArray[6] = fSigmaJPsiArray[5];
258 fSigmaChic1Array[6] = fSigmaChic1Array[5];
259 fSigmaChic2Array[6] = fSigmaChic2Array[5];
260 fSigmaPsiPArray[6] = fSigmaPsiPArray[5];
261 fSigmaUpsilonArray[6] = fSigmaUpsilonArray[5];
262 fSigmaUpsilonPArray[6] = fSigmaUpsilonPArray[5];
263 fSigmaUpsilonPPArray[6] = fSigmaUpsilonPPArray[5];
264 fSigmaCCbarArray[6] = fSigmaCCbarArray[5];
265 fSigmaBBbarArray[6] = fSigmaBBbarArray[5];
267 // x-sections for Min. Bias p-Pb & Pb-p @ 5.03 TeV: charmonia and bottomonia
268 // from 7 TeV numbers scaled according to pQCD ccbar and bbbar x-sections
269 // and with Glauber scaling
270 fCMSEnergyTeVArray[7] = 5.00; // for 5.03 TeV
271 fSigmaReactionArray[7] = 2.10;
272 fSigmaJPsiArray[7] = 5.50e-3; // 208*0.787*33.6e-6
273 fSigmaChic1Array[7] = 5.35e-3;
274 fSigmaChic2Array[7] = 8.79e-3;
275 fSigmaPsiPArray[7] = 1.23e-3;
276 fSigmaUpsilonArray[7] = 0.083e-3; // 208*0.716*0.56e-6
277 fSigmaUpsilonPArray[7] = 0.026e-3;
278 fSigmaUpsilonPPArray[7] = 0.011e-3;
279 fSigmaCCbarArray[7] = 1.13; // 208*5.44e-3
280 fSigmaBBbarArray[7] = 0.035; // 208*0.166e-3
282 fCMSEnergyTeVArray[8] = -fCMSEnergyTeVArray[7];
283 fSigmaReactionArray[8] = fSigmaReactionArray[7];
284 fSigmaJPsiArray[8] = fSigmaJPsiArray[7];
285 fSigmaChic1Array[8] = fSigmaChic1Array[7];
286 fSigmaChic2Array[8] = fSigmaChic2Array[7];
287 fSigmaPsiPArray[8] = fSigmaPsiPArray[7];
288 fSigmaUpsilonArray[8] = fSigmaUpsilonArray[7];
289 fSigmaUpsilonPArray[8] = fSigmaUpsilonPArray[7];
290 fSigmaUpsilonPPArray[8] = fSigmaUpsilonPPArray[7];
291 fSigmaCCbarArray[8] = fSigmaCCbarArray[7];
292 fSigmaBBbarArray[8] = fSigmaBBbarArray[7];
294 // x-sections for Min. Bias p-Pb & Pb-p @ 8.8 TeV: charmonia and bottomonia
295 // from 7 TeV numbers scaled according to pQCD ccbar and bbbar x-sections
296 // and with Glauber scaling
297 fCMSEnergyTeVArray[9] = 9.00; // for 8.8 TeV
298 fSigmaReactionArray[9] = 2.10;
299 fSigmaJPsiArray[9] = 8.19e-3; // 208*1.172*33.6e-6
300 fSigmaChic1Array[9] = 7.95e-3;
301 fSigmaChic2Array[9] = 13.1e-3;
302 fSigmaPsiPArray[9] = 1.85e-3;
303 fSigmaUpsilonArray[9] = 0.146e-3; // 208*1.25*0.56e-6
304 fSigmaUpsilonPArray[9] = 0.047e-3;
305 fSigmaUpsilonPPArray[9] = 0.021e-3;
306 fSigmaCCbarArray[9] = 1.68; // 208*8.1e-3
307 fSigmaBBbarArray[9] = 0.061; // 208*0.29e-3
309 fCMSEnergyTeVArray[10] = -fCMSEnergyTeVArray[9];
310 fSigmaReactionArray[10] = fSigmaReactionArray[9];
311 fSigmaJPsiArray[10] = fSigmaJPsiArray[9];
312 fSigmaChic1Array[10] = fSigmaChic1Array[9];
313 fSigmaChic2Array[10] = fSigmaChic2Array[9];
314 fSigmaPsiPArray[10] = fSigmaPsiPArray[9];
315 fSigmaUpsilonArray[10] = fSigmaUpsilonArray[9];
316 fSigmaUpsilonPArray[10] = fSigmaUpsilonPArray[9];
317 fSigmaUpsilonPPArray[10] = fSigmaUpsilonPPArray[9];
318 fSigmaCCbarArray[10] = fSigmaCCbarArray[9];
319 fSigmaBBbarArray[10] = fSigmaBBbarArray[9];
321 // x-sections for Min. Bias Pb-Pb @ 2.76 TeV: charmonia and bottomonia
322 // from 7 TeV numbers scaled according to pQCD ccbar and bbbar x-sections
323 // and with Glauber scaling
324 fCMSEnergyTeVArray[11] = 3.00; // for 2.76 TeV
325 fSigmaReactionArray[11] = 7.65;
326 fSigmaJPsiArray[11] = 0.737; // 208*208*0.507*33.6e-6
327 fSigmaChic1Array[11] = 0.715;
328 fSigmaChic2Array[11] = 1.179;
329 fSigmaPsiPArray[11] = 0.166;
330 fSigmaUpsilonArray[11] = 0.0093; // 208*208*0.384*0.56e-6
331 fSigmaUpsilonPArray[11] = 0.0030;
332 fSigmaUpsilonPPArray[11] = 0.0013;
333 fSigmaCCbarArray[11] = 151.; // 208*208*3.50e-3
334 fSigmaBBbarArray[11] = 3.8; // 208*208*0.089e-3
338 //_________________________________________________________________________
339 AliGenMUONCocktailpp::~AliGenMUONCocktailpp()
345 //_________________________________________________________________________
346 void AliGenMUONCocktailpp::SetCMSEnergy(CMSEnergyCode cmsEnergy)
348 // setter for CMSEnergy and corresponding cross-sections
349 fCMSEnergyTeV = fCMSEnergyTeVArray[cmsEnergy];
350 fSigmaReaction = fSigmaReactionArray[cmsEnergy];
351 fSigmaJPsi = fSigmaJPsiArray[cmsEnergy];
352 fSigmaChic1 = fSigmaChic1Array[cmsEnergy];
353 fSigmaChic2 = fSigmaChic2Array[cmsEnergy];
354 fSigmaPsiP = fSigmaPsiPArray[cmsEnergy];
355 fSigmaUpsilon = fSigmaUpsilonArray[cmsEnergy];
356 fSigmaUpsilonP = fSigmaUpsilonPArray[cmsEnergy];
357 fSigmaUpsilonPP = fSigmaUpsilonPPArray[cmsEnergy];
358 fSigmaCCbar = fSigmaCCbarArray[cmsEnergy];
359 fSigmaBBbar = fSigmaBBbarArray[cmsEnergy];
362 //_________________________________________________________________________
363 void AliGenMUONCocktailpp::SetResPolarization(Double_t JpsiPol, Double_t PsiPPol, Double_t UpsPol,
364 Double_t UpsPPol, Double_t UpsPPPol, char *PolFrame){
365 // setter for resonances polarization
366 if (strcmp(PolFrame,"kColSop")==0){
367 fJpsiPol = (JpsiPol>=-1 && JpsiPol<=1) ? JpsiPol : 0;
368 fPsiPPol = (PsiPPol>=-1 && PsiPPol<=1) ? PsiPPol : 0;
369 fUpsPol = (UpsPol>=-1 && UpsPol<=1) ? UpsPol : 0;
370 fUpsPPol = (UpsPPol>=-1 && UpsPPol<=1) ? UpsPPol : 0;
371 fUpsPPPol = (UpsPPPol>=-1 && UpsPPPol<=1) ? UpsPPPol : 0;
373 } else if (strcmp(PolFrame,"kHelicity")==0){
374 fJpsiPol = (JpsiPol>=-1 && JpsiPol<=1) ? JpsiPol : 0;
375 fPsiPPol = (PsiPPol>=-1 && PsiPPol<=1) ? PsiPPol : 0;
376 fUpsPol = (UpsPol>=-1 && UpsPol<=1) ? UpsPol : 0;
377 fUpsPPol = (UpsPPol>=-1 && UpsPPol<=1) ? UpsPPol : 0;
378 fUpsPPPol = (UpsPPPol>=-1 && UpsPPPol<=1) ? UpsPPPol : 0;
382 AliInfo(Form("The polarization frame is not valid"));
383 AliInfo(Form("No polarization will be set"));
392 //_________________________________________________________________________
393 void AliGenMUONCocktailpp::CreateCocktail()
395 // create and add resonances and open HF to the coctail
396 Int_t cmsEnergy = Int_t(fCMSEnergyTeV);
398 // For temporary use of p-Pb & Pb-p shadowing at 5.03 TeV for lower energies
399 if (cmsEnergy == 2 || cmsEnergy == 4) cmsEnergy = 5;
400 if (cmsEnergy == -2 || cmsEnergy == -4) cmsEnergy = -5;
402 // These limits are only used for renormalization of quarkonia cross section
403 // Pythia events are generated in 4pi
404 Double_t ptMin = fPtMin;
405 Double_t ptMax = fPtMax;
406 Double_t yMin = fYMin;;
407 Double_t yMax = fYMax;;
408 Double_t phiMin = fPhiMin*180./TMath::Pi();
409 Double_t phiMax = fPhiMax*180./TMath::Pi();
410 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));
412 // Cross sections in barns
414 Double_t sigmajpsi = fSigmaJPsi;
415 Double_t sigmachic1 = fSigmaChic1;
416 Double_t sigmachic2 = fSigmaChic2;
417 Double_t sigmapsiP = fSigmaPsiP;
418 Double_t sigmaupsilon = fSigmaUpsilon;
419 Double_t sigmaupsilonP = fSigmaUpsilonP;
420 Double_t sigmaupsilonPP = fSigmaUpsilonPP;
421 Double_t sigmaccbar = fSigmaCCbar;
422 Double_t sigmabbbar = fSigmaBBbar;
424 // Cross sections corrected with the BR in mu+mu-
425 // (only in case of use of AliDecayerPolarized)
427 if(TMath::Abs(fJpsiPol) > 1.e-30) {sigmajpsi = fSigmaJPsi*0.0593;}
428 if(TMath::Abs(fChic1Pol) > 1.e-30) {sigmachic1 = fSigmaChic1*0.;} // tb consistent
429 if(TMath::Abs(fChic2Pol) > 1.e-30) {sigmachic2 = fSigmaChic2*0.;} // tb consistent
430 if(TMath::Abs(fPsiPPol) > 1.e-30) {sigmapsiP = fSigmaPsiP*0.0075;}
431 if(TMath::Abs(fUpsPol) > 1.e-30) {sigmaupsilon = fSigmaUpsilon*0.0248;}
432 if(TMath::Abs(fUpsPPol) > 1.e-30) {sigmaupsilonP = fSigmaUpsilonP*0.0193;}
433 if(TMath::Abs(fUpsPPPol) > 1.e-30) {sigmaupsilonPP = fSigmaUpsilonPP*0.0218;}
435 // Cross sections scaled to manage the statistics
437 sigmajpsi *= fScaleJPsi*fScaleCharmonia;
438 sigmachic1 *= fScaleCharmonia;
439 sigmachic2 *= fScaleCharmonia;
440 sigmapsiP *= fScaleCharmonia;
441 sigmaupsilon *= fScaleBottomonia;
442 sigmaupsilonP *= fScaleBottomonia;
443 sigmaupsilonPP *= fScaleBottomonia;
444 sigmaccbar *= fScaleCCbar;
445 sigmabbbar *= fScaleBBbar;
447 AliInfo(Form("the parametrised resonances uses the decay mode %d",fDecayModeResonance));
449 // Create and add resonances to the generator
450 AliGenParam * genjpsi=0;
451 AliGenParam * genchic1=0;
452 AliGenParam * genchic2=0;
453 AliGenParam * genpsiP=0;
454 AliGenParam * genupsilon=0;
455 AliGenParam * genupsilonP=0;
456 AliGenParam * genupsilonPP=0;
459 Char_t nameChic1[10];
460 Char_t nameChic2[10];
464 Char_t nameUpsPP[10];
466 snprintf(nameJpsi,10, "Jpsi");
467 snprintf(nameChic1,10, "Chic1");
468 snprintf(nameChic2,10, "Chic2");
469 snprintf(namePsiP,10, "PsiP");
470 snprintf(nameUps,10, "Ups");
471 snprintf(nameUpsP,10, "UpsP");
472 snprintf(nameUpsPP,10, "UpsPP");
474 Char_t tname[40] = "";
475 if(cmsEnergy == 10) {snprintf(tname, 40, "CDF pp 10");
476 } else if (cmsEnergy == 14){snprintf(tname, 40, "CDF pp");
477 } else if (cmsEnergy == 7) {snprintf(tname, 40, "pp 7");
478 // } else if (cmsEnergy == 2) {snprintf(tname, 40, "pp 2.76");
479 } else if (cmsEnergy == 5) {snprintf(tname, 40, "pPb 5.03");
480 if (fCentralityBin > 0) snprintf(tname, 40, "pPb 5.03c%d",fCentralityBin);
481 } else if (cmsEnergy == -5){snprintf(tname, 40, "Pbp 5.03");
482 if (fCentralityBin > 0) snprintf(tname, 40, "Pbp 5.03c%d",fCentralityBin);
483 } else if (cmsEnergy == 9) {snprintf(tname, 40, "pPb 8.8");
484 if (fCentralityBin > 0) snprintf(tname, 40, "pPb 8.8c%d",fCentralityBin);
485 } else if (cmsEnergy == -9){snprintf(tname, 40, "Pbp 8.8");
486 if (fCentralityBin > 0) snprintf(tname, 40, "Pbp 8.8c%d",fCentralityBin);
487 } else if (cmsEnergy == 3) {snprintf(tname, 40, "PbPb 2.76");
488 if (fCentralityBin > 0) snprintf(tname, 40, "PbPb 2.76c%d",fCentralityBin);
490 AliError("Initialisation failed, wrong cmsEnergy");
493 genjpsi = new AliGenParam(1, AliGenMUONlib::kJpsi, tname, "Jpsi");
494 genchic1 = new AliGenParam(1, AliGenMUONlib::kChic1, tname, "Chic1");
495 genchic2 = new AliGenParam(1, AliGenMUONlib::kChic2, tname, "Chic2");
496 genpsiP = new AliGenParam(1, AliGenMUONlib::kPsiP, tname, "PsiP");
497 genupsilon = new AliGenParam(1, AliGenMUONlib::kUpsilon, tname, "Upsilon");
498 genupsilonP = new AliGenParam(1, AliGenMUONlib::kUpsilonP, tname, "UpsilonP");
499 genupsilonPP = new AliGenParam(1, AliGenMUONlib::kUpsilonPP, tname, "UpsilonPP");
501 // Hard process yield per pA or AA collision for i-th centrality bin is R*r[i]*shad[i]
502 // where R is the ratio of hard and geometrical x-sections, r[i] is the ratio of these
503 // x-section fractions for given centrality and shad[i] is the shadowing factor (in 4pi).
504 // The latter is assumed to be the same for HF-hadrons & quarkonia of the same flavour.
506 Double_t chard[20] = {0}; // charm & beauty shadowing factors are different
507 Double_t bhard[20] = {0};
508 chard[0] = 1; // 1st element for pp and min. bias (MB) collisions
511 // 4 centrality bins for p-Pb & Pb-p at 5.03 TeV: 0-20-40-60-100 %
512 if (cmsEnergy == 5 || cmsEnergy == -5) {
513 const Int_t n5 = 5; // 1st element for MB collisions
514 Double_t r5[n5] = {1, 1.936, 1.473, 0.914, 0.333}; // ratio of hard-over-geo fractions
515 Double_t cshad5[n5] = {0.806, 0.742, 0.796, 0.870, 0.955};// EPS09-LO shadowing factors
516 Double_t bshad5[n5] = {0.917, 0.889, 0.913, 0.944, 0.981};
517 for(i=0; i<n5; i++) {
518 chard[i] = cshad5[i]*r5[i];
519 bhard[i] = bshad5[i]*r5[i];
523 // 4 centrality bins for p-Pb & Pb-p at 8.8 TeV: 0-20-40-60-100 %
524 if (cmsEnergy == 9 || cmsEnergy == -9) {
525 const Int_t n9 = 5; // 1st element for MB collisions
526 Double_t r9[n9] = {1, 1.936, 1.473, 0.914, 0.333}; // ratio of hard-over-geo fractions
527 Double_t cshad9[n9] = {0.785, 0.715, 0.775, 0.856, 0.951};// EKS98 shadowing factors
528 Double_t bshad9[n9] = {0.889, 0.853, 0.884, 0.926, 0.975};
529 for(i=0; i<n9; i++) {
530 chard[i] = cshad9[i]*r9[i];
531 bhard[i] = bshad9[i]*r9[i];
535 // 11 centrality bins for Pb-Pb at 2.76 TeV: 0-5-10-20-30-40-50-60-70-80-90-100 %
536 if (cmsEnergy == 3) {
537 const Int_t n3 = 12; // 1st element for MB collisions
538 Double_t r3[n3] = {1, 4.661, 3.647, 2.551, 1.544, 0.887, 0.474,
539 0.235, 0.106, 0.044, 0.017, 0.007}; // ratio of hard-over-geo fractions
540 Double_t cshad3[n3] = {0.662, 0.622, 0.631, 0.650, 0.681, 0.718,
541 0.760, 0.805, 0.849, 0.888, 0.918, 0.944};// EKS98 shadowing factors
542 Double_t bshad3[n3] = {0.874, 0.856, 0.861, 0.869, 0.883, 0.898,
543 0.915, 0.932, 0.948, 0.962, 0.972, 0.981};
544 for(i=0; i<n3; i++) {
545 chard[i] = cshad3[i]*r3[i];
546 bhard[i] = bshad3[i]*r3[i];
550 AddReso2Generator(nameJpsi,genjpsi,chard[fCentralityBin]*sigmajpsi,fJpsiPol);
551 AddReso2Generator(nameChic1,genchic1,chard[fCentralityBin]*sigmachic1,fChic1Pol);
552 AddReso2Generator(nameChic2,genchic2,chard[fCentralityBin]*sigmachic2,fChic2Pol);
553 AddReso2Generator(namePsiP,genpsiP,chard[fCentralityBin]*sigmapsiP,fPsiPPol);
555 AddReso2Generator(nameUps,genupsilon,bhard[fCentralityBin]*sigmaupsilon,fUpsPol);
556 AddReso2Generator(nameUpsP,genupsilonP,bhard[fCentralityBin]*sigmaupsilonP,fUpsPPol);
557 AddReso2Generator(nameUpsPP,genupsilonPP,bhard[fCentralityBin]*sigmaupsilonPP,fUpsPPPol);
559 //------------------------------------------------------------------
560 // Generator of charm
561 AliGenCorrHF *gencharm = new AliGenCorrHF(1, 4, cmsEnergy);
562 gencharm->SetMomentumRange(0,9999);
563 gencharm->SetForceDecay(kAll);
564 Double_t ratioccbar = chard[fCentralityBin]*sigmaccbar/fSigmaReaction;
565 if (!gMC) gencharm->SetDecayer(fDecayer);
568 AliInfo(Form("c-cbar prod. cross-section in pp %5.3g b",sigmaccbar));
569 AliInfo(Form("c-cbar prod. probability per collision in acceptance %5.3g",ratioccbar));
571 AddGenerator(gencharm,"CorrHFCharm",ratioccbar);
572 //------------------------------------------------------------------
573 // Generator of beauty
574 AliGenCorrHF *genbeauty = new AliGenCorrHF(1, 5, cmsEnergy);
575 genbeauty->SetMomentumRange(0,9999);
576 genbeauty->SetForceDecay(kAll);
577 Double_t ratiobbbar = bhard[fCentralityBin]*sigmabbbar/fSigmaReaction;
578 if (!gMC) genbeauty->SetDecayer(fDecayer);
581 AliInfo(Form("b-bbar prod. cross-section in pp %5.3g b",sigmabbbar));
582 AliInfo(Form("b-bbar prod. probability per collision in acceptance %5.3g",ratiobbbar));
584 AddGenerator(genbeauty,"CorrHFBeauty",ratiobbbar);
586 //-------------------------------------------------------------------
589 // This has to go into the Config.C
591 // AliGenPythia *pythia = new AliGenPythia(1);
592 // pythia->SetProcess(kPyMbMSEL1);
593 // pythia->SetStrucFunc(kCTEQ5L);
594 // pythia->SetEnergyCMS(14000.);
595 // AliInfo(Form("\n\npythia uses the decay mode %d", GetDecayModePythia()));
596 // Decay_t dt = gener->GetDecayModePythia();
597 // pythia->SetForceDecay(dt);
598 // pythia->SetPtRange(0.,100.);
599 // pythia->SetYRange(-8.,8.);
600 // pythia->SetPhiRange(0.,360.);
601 // pythia->SetPtHard(2.76,-1.0);
602 // pythia->SwitchHFOff();
604 // AddGenerator(pythia,"Pythia",1);
608 //-------------------------------------------------------------------
609 void AliGenMUONCocktailpp::AddReso2Generator(Char_t* nameReso,
610 AliGenParam* const genReso,
614 // add resonances to the cocktail
615 Double_t phiMin = fPhiMin*180./TMath::Pi();
616 Double_t phiMax = fPhiMax*180./TMath::Pi();
618 // first step: generation in 4pi
619 genReso->SetPtRange(0.,100.);
620 genReso->SetYRange(-8.,8.);
621 genReso->SetPhiRange(0.,360.);
622 genReso->SetForceDecay(fDecayModeResonance);
623 if (!gMC) genReso->SetDecayer(fDecayer);
624 genReso->Init(); // generation in 4pi
625 // Ratios with respect to the reaction cross-section in the
626 // kinematics limit of the MUONCocktail
627 Double_t ratioReso = sigmaReso / fSigmaReaction * genReso->GetRelativeArea(fPtMin,fPtMax,fYMin,fYMax,phiMin,phiMax);
629 AliInfo(Form("%s prod. cross-section in pp %5.3g b",nameReso,sigmaReso));
630 AliInfo(Form("%s prod. probability per collision in acceptance %5.3g",nameReso,ratioReso));
632 // second step: generation in selected kinematical range
633 genReso->SetPtRange(fPtMin, fPtMax);
634 genReso->SetYRange(fYMin, fYMax);
635 genReso->SetPhiRange(phiMin, phiMax);
636 genReso->Init(); // generation in selected kinematical range
638 TVirtualMCDecayer *decReso = 0;
639 if(TMath::Abs(polReso) > 1.e-30){
640 AliInfo(Form("******Setting polarized decayer for %s''",nameReso));
642 decReso = new AliDecayerPolarized(polReso,AliDecayerPolarized::kColSop,AliDecayerPolarized::kMuon);
643 AliInfo(Form("******Reference frame: %s, alpha: %f","Collins-Soper",polReso));
646 decReso = new AliDecayerPolarized(polReso,AliDecayerPolarized::kHelicity,AliDecayerPolarized::kMuon);
647 AliInfo(Form("******Reference frame: %s, alpha: %f","Helicity",polReso));
650 decReso->SetForceDecay(kAll);
652 genReso->SetDecayer(decReso);
656 AddGenerator(genReso,nameReso,ratioReso); // Adding Generator
659 //-------------------------------------------------------------------
660 void AliGenMUONCocktailpp::Init()
663 TIter next(fEntries);
664 AliGenCocktailEntry *entry;
666 while((entry = (AliGenCocktailEntry*)next())) {
667 entry->Generator()->SetStack(fStack);
672 //_________________________________________________________________________
673 void AliGenMUONCocktailpp::Generate()
676 TIter next(fEntries);
677 AliGenCocktailEntry *entry = 0;
678 AliGenCocktailEntry *preventry = 0;
679 AliGenerator* gen = 0;
681 if (fHeader) delete fHeader;
682 fHeader = new AliGenCocktailEventHeader("MUON Cocktail Header");
684 const TObjArray *partArray = gAlice->GetMCApp()->Particles();
686 // Generate the vertex position used by all generators
687 if(fVertexSmear == kPerEvent) Vertex();
689 // Loop on primordialTrigger:
690 // minimum muon multiplicity above a pt cut in a theta acceptance region
692 Bool_t primordialTrigger = kFALSE;
693 while(!primordialTrigger) {
694 //Reseting stack (if fMuonMultiplicity > 0 : S. Grigoryan, June 2012)
695 AliRunLoader * runloader = AliRunLoader::Instance();
697 if (runloader && fMuonMultiplicity > 0)
698 if (runloader->Stack())
699 runloader->Stack()->Clean();
700 // Loop over generators and generate events
703 const char* genName = 0;
704 while((entry = (AliGenCocktailEntry*)next())) {
705 gen = entry->Generator();
706 genName = entry->GetName();
707 gen->SetVertex(fVertex.At(0), fVertex.At(1), fVertex.At(2));
710 npart = (strcmp(genName,"Pythia") == 0) ? 1 :
711 gRandom->Poisson(entry->Rate());
715 if (igen == 1) entry->SetFirst(0);
716 else entry->SetFirst((partArray->GetEntriesFast())+1);
718 gen->SetNumberParticles(npart);
720 entry->SetLast(partArray->GetEntriesFast());
727 // Testing primordial trigger: Single muons or dimuons with Pt above a Pt cut
728 // in the muon spectrometer acceptance
731 Int_t numberOfMuons=0;Int_t maxPart = partArray->GetEntriesFast();
732 for(iPart=0; iPart<maxPart; iPart++){
734 TParticle *part = gAlice->GetMCApp()->Particle(iPart);
735 if ( TMath::Abs(part->GetPdgCode()) == 13 ){
736 if((part->Vz() > fMuonOriginCut) && //take only the muons that decayed before the abs + 1 int. length in C abs
737 (part->Theta()*180./TMath::Pi()>fMuonThetaMinCut) &&
738 (part->Theta()*180./TMath::Pi()<fMuonThetaMaxCut) &&
739 (part->Pt()>fMuonPtCut) &&
740 (part->P()>fMuonPCut)) {
745 if (numberOfMuons >= fMuonMultiplicity) {
746 primordialTrigger = kTRUE;
747 fHeader->SetNProduced(maxPart);
755 for (Int_t j=0; j < 3; j++) eventVertex[j] = fVertex[j];
757 fHeader->SetPrimaryVertex(eventVertex);
758 fHeader->SetInteractionTime(fTime);
760 gAlice->SetGenEventHeader(fHeader);
762 // AliInfo(Form("Generated Events are %d and Succeeded Events are %d",fNGenerated,fNSucceded));
763 AliDebug(5,Form("Generated Events are %d and Succeeded Events are %d",fNGenerated,fNSucceded));