Apdating display to cm units in mapping (Christian, Indra)
[u/mrichter/AliRoot.git] / EVGEN / AliGenMUONCocktail.cxx
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15
16/* $Id$ */
17
9538aedd 18//
84954c47 19// Classe to create the MUON coktail for physics in the Alice muon spectrometer
9538aedd 20// The followoing muons sources are included in this cocktail:
17016a57 21// jpsi, upsilon, non-correlated open and beauty.
9538aedd 22// The free parameeters are :
23// pp reaction cross-section
24// production cross-sections in pp collisions and
17016a57 25// branching ratios in the muon channel and shadowing
26// Hard probes are supposed to scale with Ncoll and hadronic muon production with (0.8Ncoll+0.2*Npart)
27// There is a primordial trigger which requires :
9538aedd 28// a minimum muon multiplicity above a pT cut in a theta acceptance cone
29//
84954c47 30
84954c47 31#include <TObjArray.h>
84954c47 32#include <TParticle.h>
17016a57 33#include <TF1.h>
84954c47 34
84954c47 35#include "AliGenCocktailEntry.h"
ac3faee4 36#include "AliGenMUONCocktail.h"
37#include "AliGenMUONlib.h"
17016a57 38#include "AliFastGlauber.h"
ac3faee4 39#include "AliGenParam.h"
84954c47 40#include "AliMC.h"
ac3faee4 41#include "AliRun.h"
84954c47 42#include "AliStack.h"
17016a57 43#include "AliLog.h"
84954c47 44
45ClassImp(AliGenMUONCocktail)
46
47
48//________________________________________________________________________
49AliGenMUONCocktail::AliGenMUONCocktail()
50 :AliGenCocktail()
51{
52// Constructor
17016a57 53 fFastGlauber =0x0;
84954c47 54 fTotalRate =0;
55 fNSucceded=0;
56 fNGenerated=0;
57 fMuonMultiplicity=1;
58 fMuonPtCut= 1.;
59 fMuonThetaMinCut=171.;
60 fMuonThetaMaxCut=178.;
17016a57 61 fLowImpactParameter = 0.;
62 fHighImpactParameter = 5.;
63 fAverageImpactParameter =0.;
64 fNumberOfCollisions = 0.;
65 fNumberOfParticipants = 0.;
66 fHadronicMuons = kTRUE;
84954c47 67}
68//_________________________________________________________________________
69AliGenMUONCocktail::AliGenMUONCocktail(const AliGenMUONCocktail & cocktail):
70 AliGenCocktail(cocktail)
71{
72// Copy constructor
17016a57 73 fFastGlauber =0x0;
84954c47 74 fTotalRate =0;
75 fNSucceded=0;
76 fNGenerated=0;
77 fMuonMultiplicity=1;
78 fMuonPtCut= 1.;
79 fMuonThetaMinCut=171.;
17016a57 80 fMuonThetaMaxCut=178.;
81 fLowImpactParameter = 0.;
82 fHighImpactParameter = 5.;
83 fAverageImpactParameter =0.;
84 fNumberOfCollisions = 0.;
85 fNumberOfParticipants = 0.;
86 fHadronicMuons = kTRUE;
84954c47 87}
88//_________________________________________________________________________
89AliGenMUONCocktail::~AliGenMUONCocktail()
90{
91// Destructor
17016a57 92 if (fFastGlauber) delete fFastGlauber;
84954c47 93}
94
95//_________________________________________________________________________
96void AliGenMUONCocktail::Init()
97{
17016a57 98 // NN cross section
99 Double_t sigmaReaction = 0.072; // MinBias NN cross section for PbPb LHC energies http://arxiv.org/pdf/nucl-ex/0302016
100
101 // Initialising Fast Glauber object
102 fFastGlauber = new AliFastGlauber();
103 fFastGlauber->SetPbPbLHC();
104 fFastGlauber->SetNNCrossSection(sigmaReaction*1000.); //Expected NN cross-section in mb at LHC with diffractive part http://arxiv.org/pdf/nucl-ex/0302016 )
105 fFastGlauber->Init(1);
106
107 // Calculating average number of collisions
108 Int_t ib=0;
109 Int_t ibmax=10000;
110 Double_t b = 0.;
111 fAverageImpactParameter=0.;
112 fNumberOfCollisions = 0.;
113 fNumberOfParticipants = 0.;
114 for(ib=0; ib<ibmax; ib++) {
115 b = fFastGlauber->GetRandomImpactParameter(fLowImpactParameter,fHighImpactParameter);
116 fAverageImpactParameter+=b;
117 fNumberOfCollisions += fFastGlauber->GetNumberOfCollisions( b )/(1.-TMath::Exp(-fFastGlauber->GetNumberOfCollisions(b)));
118 fNumberOfParticipants += fFastGlauber->GetNumberOfParticipants( b );
119 }
120 fAverageImpactParameter/= ((Double_t) ibmax);
121 fNumberOfCollisions /= ((Double_t) ibmax);
122 fNumberOfParticipants /= ((Double_t) ibmax);;
123 AliInfo(Form("<b>=%4.2f, <Ncoll>=%5.1f and and <Npart>=%5.1f",b, fNumberOfCollisions, fNumberOfParticipants));
124
125 // Estimating shadowing on charm a beaty production
126 // -----------------------------------------------------
127 // Extrapolation of the cross sections from $p-p$ to \mbox{Pb--Pb}
128 // interactions
129 // is done by means of the Glauber model. For the impact parameter dependence
130 // of the shadowing factor we use a simple formula:
131 // $C_{sh}(b) = C_{sh}(0) + (1 - C_{sh}(0))(b/16~fm)4$,
132 // motivated by the theoretical predictions (see e.g.
133 // V. Emelyanov et al., Phys. Rev. C61, 044904 (2000)) and HIJING
134 // simulations showing an almost flat behaviour
135 // up to 10~$fm$ and a rapid increase to 1 for larger impact parameters.
136 // C_{sh}(0) = 0.60 for Psi and 0.76 for Upsilon (Smba communication).
137 // for open charm and beauty is 0.65 and 0.84
138 // -----------------------------------------------------
139 Double_t charmshadowing = 0.65 + (1.0-0.65)*TMath::Power(fAverageImpactParameter/16.,4);
140 Double_t beautyshadowing = 0.84 + (1.0-0.84)*TMath::Power(fAverageImpactParameter/16.,4);
141 Double_t charmoniumshadowing = 0.60 + (1.0-0.60)*TMath::Power(fAverageImpactParameter/16.,4);
142 Double_t beautoniumshadowing = 0.76 + (1.0-0.76)*TMath::Power(fAverageImpactParameter/16.,4);
143 if (fAverageImpactParameter>16.) {
144 charmoniumshadowing = 1.0;
145 beautoniumshadowing = 1.0;
146 charmshadowing = 1.0;
147 beautyshadowing= 1.0;
148 }
149 AliInfo(Form("Shadowing for charmonium and beautonium production are %4.2f and %4.2f respectively",charmoniumshadowing,beautoniumshadowing));
150 AliInfo(Form("Shadowing for charm and beauty production are %4.2f and %4.2f respectively",charmshadowing,beautyshadowing));
84954c47 151
17016a57 152 // Defining MUON physics cocktail
84954c47 153 // Kinematical limits for particle generation
17016a57 154 Double_t ptMin = fPtMin;
155 Double_t ptMax = fPtMax;
156 Double_t yMin = fYMin;;
157 Double_t yMax = fYMax;;
158 Double_t phiMin = fPhiMin*180./TMath::Pi();
159 Double_t phiMax = fPhiMax*180./TMath::Pi();
160 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));
161
162 // Generating J/Psi Physics
b2f864d7 163 // Using CFD scaled distribution (see http://clrwww.in2p3.fr/DIMUON2004/talks/sgrigoryan.pdf )
164 AliGenParam * genjpsi = new AliGenParam(1, AliGenMUONlib::kJpsi, "CDF scaled", "Jpsi");
17016a57 165 genjpsi->SetPtRange(0,100.); // 4pi generation
9538aedd 166 genjpsi->SetYRange(-8.,8);
167 genjpsi->SetPhiRange(0.,360.);
168 genjpsi->SetForceDecay(kDiMuon);
169 genjpsi->SetTrackingFlag(1);
17016a57 170 // Calculation of the particle multiplicity per event in the muonic channel
171 Double_t ratiojpsi; // Ratio with respect to the reaction cross-section for the muonic channel in the kinematics limit of the MUONCocktail
172 Double_t sigmajpsi = 31.0e-6 * charmoniumshadowing; // section "6.7 Quarkonia Production" table 6.5 for pp times shadowing
173 Double_t brjpsi = 0.0588; // Branching Ratio for JPsi PDG PRC15 (200)
9538aedd 174 genjpsi->Init(); // Generating pT and Y parametrsation for the 4pi
175 ratiojpsi = sigmajpsi * brjpsi * fNumberOfCollisions / sigmaReaction * genjpsi->GetRelativeArea(ptMin,ptMax,yMin,yMax,phiMin,phiMax);
17016a57 176 AliInfo(Form("Jpsi production cross-section in pp with shadowing %5.3g barns",sigmajpsi));
177 AliInfo(Form("Jpsi production probability per collisions in acceptance via the muonic channel %5.3g",ratiojpsi));
84954c47 178 // Generation in the kinematical limits of AliGenMUONCocktail
9538aedd 179 genjpsi->SetPtRange(ptMin, ptMax);
180 genjpsi->SetYRange(yMin, yMax);
181 genjpsi->SetPhiRange(phiMin, phiMax);
182 genjpsi->Init(); // Generating pT and Y parametrsation in the desired kinematic range
84954c47 183 // Adding Generator
9538aedd 184 AddGenerator(genjpsi, "Jpsi", ratiojpsi);
185 fTotalRate+=ratiojpsi;
84954c47 186
88e5db43 187 // Generating Psi prime Physics
b2f864d7 188 // Using CFD scaled distribution (see http://clrwww.in2p3.fr/DIMUON2004/talks/sgrigoryan.pdf )
189 AliGenParam * genpsiP = new AliGenParam(1, AliGenMUONlib::kPsiP, "CDF scaled", "PsiP");
17016a57 190 genpsiP->SetPtRange(0,100.);// 4pi generation
88e5db43 191 genpsiP->SetYRange(-8.,8);
192 genpsiP->SetPhiRange(0.,360.);
193 genpsiP->SetForceDecay(kDiMuon);
194 genpsiP->SetTrackingFlag(1);
195 // Calculation of the paritcle multiplicity per event in the muonic channel
17016a57 196 Double_t ratiopsiP; // Ratio with respect to the reaction cross-section for the muonic channel in the kinematics limit of the MUONCocktail
197 Double_t sigmapsiP = 4.68e-6 * charmoniumshadowing; // section "6.7 Quarkonia Production" table 6.5 for pp times shadowing
198 Double_t brpsiP = 0.0103; // Branching Ratio for PsiP
88e5db43 199 genpsiP->Init(); // Generating pT and Y parametrsation for the 4pi
200 ratiopsiP = sigmapsiP * brpsiP * fNumberOfCollisions / sigmaReaction * genpsiP->GetRelativeArea(ptMin,ptMax,yMin,yMax,phiMin,phiMax);
17016a57 201 AliInfo(Form("Psi prime production cross-section in pp with shadowing %5.3g barns",sigmapsiP));
202 AliInfo(Form("Psi prime production probability per collisions in acceptance via the muonic channel %5.3g",ratiopsiP));
88e5db43 203 // Generation in the kinematical limits of AliGenMUONCocktail
204 genpsiP->SetPtRange(ptMin, ptMax);
205 genpsiP->SetYRange(yMin, yMax);
206 genpsiP->SetPhiRange(phiMin, phiMax);
207 genpsiP->Init(); // Generating pT and Y parametrsation in the desired kinematic range
208 // Adding Generator
209 AddGenerator(genpsiP, "PsiP", ratiopsiP);
210 fTotalRate+=ratiopsiP;
211
17016a57 212 // Generating Upsilon Physics
b2f864d7 213 // Using CFD scaled distribution (see http://clrwww.in2p3.fr/DIMUON2004/talks/sgrigoryan.pdf )
214 AliGenParam * genupsilon = new AliGenParam(1, AliGenMUONlib::kUpsilon, "CDF scaled", "Upsilon");
9538aedd 215 genupsilon->SetPtRange(0,100.);
216 genupsilon->SetYRange(-8.,8);
217 genupsilon->SetPhiRange(0.,360.);
218 genupsilon->SetForceDecay(kDiMuon);
219 genupsilon->SetTrackingFlag(1);
17016a57 220 Double_t ratioupsilon; // Ratio with respect to the reaction cross-section for the muonic channel in the kinematics limit of the MUONCocktail
221 Double_t sigmaupsilon = 0.501e-6 * beautoniumshadowing; // section "6.7 Quarkonia Production" table 6.5 for pp times shadowing
222 Double_t brupsilon = 0.0248; // Branching Ratio for Upsilon
9538aedd 223 genupsilon->Init(); // Generating pT and Y parametrsation for the 4pi
224 ratioupsilon = sigmaupsilon * brupsilon * fNumberOfCollisions / sigmaReaction * genupsilon->GetRelativeArea(ptMin,ptMax,yMin,yMax,phiMin,phiMax);
17016a57 225 AliInfo(Form("Upsilon 1S production cross-section in pp with shadowing %5.3g barns",sigmaupsilon));
226 AliInfo(Form("Upsilon 1S production probability per collisions in acceptance via the muonic channel %5.3g",ratioupsilon));
9538aedd 227 genupsilon->SetPtRange(ptMin, ptMax);
228 genupsilon->SetYRange(yMin, yMax);
229 genupsilon->SetPhiRange(phiMin, phiMax);
230 genupsilon->Init(); // Generating pT and Y parametrsation in the desired kinematic range
231 AddGenerator(genupsilon,"Upsilon", ratioupsilon);
232 fTotalRate+=ratioupsilon;
84954c47 233
17016a57 234 // Generating UpsilonP Physics
b2f864d7 235 // Using CFD scaled distribution (see http://clrwww.in2p3.fr/DIMUON2004/talks/sgrigoryan.pdf )
236 AliGenParam * genupsilonP = new AliGenParam(1, AliGenMUONlib::kUpsilonP, "CDF Scaled", "UpsilonP");
88e5db43 237 genupsilonP->SetPtRange(0,100.);
238 genupsilonP->SetYRange(-8.,8);
239 genupsilonP->SetPhiRange(0.,360.);
240 genupsilonP->SetForceDecay(kDiMuon);
241 genupsilonP->SetTrackingFlag(1);
17016a57 242 Double_t ratioupsilonP; // Ratio with respect to the reaction cross-section for the muonic channel in the kinematics limit of the MUONCocktail
243 Double_t sigmaupsilonP = 0.246e-6 * beautoniumshadowing; // section "6.7 Quarkonia Production" table 6.5 for pp times shadowing
244 Double_t brupsilonP = 0.0131; // Branching Ratio for UpsilonP
88e5db43 245 genupsilonP->Init(); // Generating pT and Y parametrsation for the 4pi
246 ratioupsilonP = sigmaupsilonP * brupsilonP * fNumberOfCollisions / sigmaReaction * genupsilonP->GetRelativeArea(ptMin,ptMax,yMin,yMax,phiMin,phiMax);
17016a57 247 AliInfo(Form("Upsilon 2S production cross-section in pp with shadowing %5.3g barns",sigmaupsilonP));
248 AliInfo(Form("Upsilon 2S production probability per collisions in acceptance via the muonic channel %5.3g",ratioupsilonP));
88e5db43 249 genupsilonP->SetPtRange(ptMin, ptMax);
250 genupsilonP->SetYRange(yMin, yMax);
251 genupsilonP->SetPhiRange(phiMin, phiMax);
252 genupsilonP->Init(); // Generating pT and Y parametrsation in the desired kinematic range
253 AddGenerator(genupsilonP,"UpsilonP", ratioupsilonP);
254 fTotalRate+=ratioupsilonP;
255
17016a57 256 // Generating UpsilonPP Physics
b2f864d7 257 // Using CFD scaled distribution (see http://clrwww.in2p3.fr/DIMUON2004/talks/sgrigoryan.pdf )
258 AliGenParam * genupsilonPP = new AliGenParam(1, AliGenMUONlib::kUpsilonPP, "CDF Scaled", "UpsilonPP");
88e5db43 259 genupsilonPP->SetPtRange(0,100.);
260 genupsilonPP->SetYRange(-8.,8);
261 genupsilonPP->SetPhiRange(0.,360.);
262 genupsilonPP->SetForceDecay(kDiMuon);
263 genupsilonPP->SetTrackingFlag(1);
17016a57 264 Double_t ratioupsilonPP; // Ratio with respect to the reaction cross-section for the muonic channel in the kinematics limit of the MUONCocktail
265 Double_t sigmaupsilonPP = 0.100e-6 * beautoniumshadowing; // section "6.7 Quarkonia Production" table 6.5 for pp times shadowing
266 Double_t brupsilonPP = 0.0181; // Branching Ratio for UpsilonPP
88e5db43 267 genupsilonPP->Init(); // Generating pT and Y parametrsation for the 4pi
268 ratioupsilonPP = sigmaupsilonPP * brupsilonPP * fNumberOfCollisions / sigmaReaction * genupsilonPP->GetRelativeArea(ptMin,ptMax,yMin,yMax,phiMin,phiMax);
17016a57 269 AliInfo(Form("Upsilon 3S production cross-section in pp with shadowing %5.3g barns",sigmaupsilonPP));
270 AliInfo(Form("Upsilon 3S production probability per collisions in acceptance via the muonic channel %5.3g",ratioupsilonPP));
88e5db43 271 genupsilonPP->SetPtRange(ptMin, ptMax);
272 genupsilonPP->SetYRange(yMin, yMax);
273 genupsilonPP->SetPhiRange(phiMin, phiMax);
274 genupsilonPP->Init(); // Generating pT and Y parametrsation in the desired kinematic range
275 AddGenerator(genupsilonPP,"UpsilonPP", ratioupsilonPP);
276 fTotalRate+=ratioupsilonPP;
277
17016a57 278// Generating non-correlated Charm Physics
b2f864d7 279 AliGenParam * gencharm = new AliGenParam(1, AliGenMUONlib::kCharm, "pp", "Charm");
9538aedd 280 gencharm->SetPtRange(0,100.);
281 gencharm->SetYRange(-8.,8);
282 gencharm->SetPhiRange(0.,360.);
283 gencharm->SetForceDecay(kSemiMuonic);
284 gencharm->SetTrackingFlag(1);
17016a57 285 Double_t ratiocharm; // Ratio with respect to the reaction cross-section for the muonic channel in the kinematics limit of the MUONCocktail
286 Double_t sigmacharm = 2. * 6.64e-3 * charmshadowing ; //
287 Double_t brcharm = 0.12; // Branching Ratio for Charm
9538aedd 288 gencharm->Init(); // Generating pT and Y parametrsation for the 4pi
17016a57 289 ratiocharm = sigmacharm * brcharm * fNumberOfCollisions / sigmaReaction * gencharm->GetRelativeArea(ptMin,ptMax,yMin,yMax,phiMin,phiMax);
290 AliInfo(Form("Charm production cross-section in pp with shadowing %5.3g barns",sigmacharm));
291 AliInfo(Form("Charm production probability per collisions in acceptance via the semi-muonic channel %5.3g",ratiocharm));
9538aedd 292 gencharm->SetPtRange(ptMin, ptMax);
293 gencharm->SetYRange(yMin, yMax);
294 gencharm->SetPhiRange(phiMin, phiMax);
295 gencharm->Init(); // Generating pT and Y parametrsation in the desired kinematic range
9538aedd 296 AddGenerator(gencharm,"Charm", ratiocharm);
297 fTotalRate+=ratiocharm;
84954c47 298
17016a57 299// Generating non-correlated Beauty Physics
b2f864d7 300 AliGenParam * genbeauty = new AliGenParam(1, AliGenMUONlib::kBeauty, "pp", "Beauty");
9538aedd 301 genbeauty->SetPtRange(0,100.);
302 genbeauty->SetYRange(-8.,8);
303 genbeauty->SetPhiRange(0.,360.);
304 genbeauty->SetForceDecay(kSemiMuonic);
305 genbeauty->SetTrackingFlag(1);
17016a57 306 Double_t ratiobeauty; // Ratio with respect to the reaction cross-section for the muonic channel in the kinematics limit of the MUONCocktail
307 Double_t sigmabeauty = 2. * 0.210e-3 * beautyshadowing; //
308 Double_t brbeauty = 0.15; // Branching Ratio for Beauty
9538aedd 309 genbeauty->Init(); // Generating pT and Y parametrsation for the 4pi
310 ratiobeauty = sigmabeauty * brbeauty * fNumberOfCollisions / sigmaReaction *
311 genbeauty->GetRelativeArea(ptMin,ptMax,yMin,yMax,phiMin,phiMax);
17016a57 312 AliInfo(Form("Beauty production cross-section in pp with shadowing %5.3g barns",sigmabeauty));
313 AliInfo(Form("Beauty production probability per collisions in acceptance via the semi-muonic channel %5.3g",ratiobeauty));
9538aedd 314 genbeauty->SetPtRange(ptMin, ptMax);
315 genbeauty->SetYRange(yMin, yMax);
316 genbeauty->SetPhiRange(phiMin, phiMax);
317 genbeauty->Init(); // Generating pT and Y parametrisation in the desired kinematic range
9538aedd 318 AddGenerator(genbeauty,"Beauty", ratiobeauty);
319 fTotalRate+=ratiobeauty;
84954c47 320
17016a57 321 // Only if hadronic muons are included in the cocktail
322 if(fHadronicMuons) {
323 // Generating Pion Physics
324 // The scaling with Npart and Ncoll has been obtained to reproduced tha values presented by Valeri lors de presentatation
325 // a Clermont Ferrand http://pcrochet.home.cern.ch/pcrochet/files/valerie.pdf
326 // b range(fm) Ncoll Npart N_mu pT>0.4 GeV/c
327 // 0 - 3 1982 381 3.62
328 // 3 - 6 1388 297 3.07
329 // 6 - 9 674 177 1.76
330 // 9 - 12 188 71 0.655
331 // 12 - 16 15 10 0.086
332 // We found the hadronic muons scales quite well with the number of participants
b2f864d7 333 AliGenParam * genpion = new AliGenParam(1, AliGenMUONlib::kPion, "default", "Pion");
17016a57 334 genpion->SetPtRange(0,100.);
335 genpion->SetYRange(-8.,8);
336 genpion->SetPhiRange(0.,360.);
337 genpion->SetForceDecay(kPiToMu);
338 genpion->SetTrackingFlag(1);
339 Double_t ratiopion; // Ratio with respect to the reaction cross-section for the muonic channel in the kinematics limit of the MUONCocktail
340 Double_t sigmapion = 1.80e-2; // Just for reproducing Valeries's data
341 Double_t brpion = 0.9999; // Branching Ratio for Pion
342 genpion->Init(); // Generating pT and Y parametrsation for the 4pi
343 ratiopion = sigmapion * brpion * (0.93*fNumberOfParticipants+0.07*fNumberOfCollisions) / sigmaReaction * genpion->GetRelativeArea(ptMin,ptMax,yMin,yMax,phiMin,phiMax);
344 AliInfo(Form("Pseudo-Pion production cross-section in pp with shadowing %5.3g barns",sigmapion));
345 AliInfo(Form("Pion production probability per collisions in acceptance via the muonic channel %5.3g",ratiopion));
346 genpion->SetPtRange(ptMin, ptMax);
347 genpion->SetYRange(yMin, yMax);
348 genpion->SetPhiRange(phiMin, phiMax);
349 genpion->Init(); // Generating pT and Y parametrsation in the desired kinematic range
350 AddGenerator(genpion,"Pion", ratiopion);
351 fTotalRate+=ratiopion;
352
353 // Generating Kaon Physics
b2f864d7 354 AliGenParam * genkaon = new AliGenParam(1, AliGenMUONlib::kKaon, "default", "Kaon");
17016a57 355 genkaon->SetPtRange(0,100.);
356 genkaon->SetYRange(-8.,8);
357 genkaon->SetPhiRange(0.,360.);
358 genkaon->SetForceDecay(kKaToMu);
359 genkaon->SetTrackingFlag(1);
360 Double_t ratiokaon; // Ratio with respect to the reaction cross-section for the muonic channel in the kinematics limit of the MUONCocktail
361 Double_t sigmakaon = 2.40e-4; // Valerie presentation Clermont-16-jan-2004 and Alice-int-2002-06
362 Double_t brkaon = 0.6351 ; // Branching Ratio for Kaon
363 genkaon->Init(); // Generating pT and Y parametrsation for the 4pi
364 ratiokaon = sigmakaon * brkaon * (0.93*fNumberOfParticipants+0.07*fNumberOfCollisions)/ sigmaReaction * genkaon->GetRelativeArea(ptMin,ptMax,yMin,yMax,phiMin,phiMax);
365 AliInfo(Form("Pseudo-kaon production cross-section in pp with shadowing %5.3g barns",sigmakaon));
366 AliInfo(Form("Kaon production probability per collisions in acceptance via the muonic channel %5.3g",ratiokaon));
367 genkaon->SetPtRange(ptMin, ptMax);
368 genkaon->SetYRange(yMin, yMax);
369 genkaon->SetPhiRange(phiMin, phiMax);
370 genkaon->Init(); // Generating pT and Y parametrsation in the desired kinematic range
371 AddGenerator(genkaon,"Kaon", ratiokaon);
372 fTotalRate+=ratiokaon;
373 }
84954c47 374}
375
376//_________________________________________________________________________
377void AliGenMUONCocktail::Generate()
378{
379 //
380// Generate event
381 TIter next(fEntries);
382 AliGenCocktailEntry *entry = 0;
383 AliGenCocktailEntry *preventry = 0;
384 AliGenerator* gen = 0;
84954c47 385 TObjArray *partArray = gAlice->GetMCApp()->Particles();
386
17016a57 387// Generate the vertex position used by all generators
84954c47 388 if(fVertexSmear == kPerEvent) Vertex();
84954c47 389
17016a57 390 // Loop on primordialTrigger
391 Bool_t primordialTrigger = kFALSE;
9538aedd 392 while(!primordialTrigger) {
84954c47 393 //Reseting stack
394 AliRunLoader * runloader = gAlice->GetRunLoader();
395 if (runloader)
396 if (runloader->Stack())
397 runloader->Stack()->Reset();
84954c47 398 // Loop over generators and generate events
399 Int_t igen=0;
400 Int_t npart =0;
84954c47 401 while((entry = (AliGenCocktailEntry*)next())) {
402 gen = entry->Generator();
403 gen->SetVertex(fVertex.At(0), fVertex.At(1), fVertex.At(2));
404 if ( (npart = gRandom->Poisson(entry->Rate())) >0 ) {
405 igen++;
406 if (igen ==1) entry->SetFirst(0);
407 else entry->SetFirst((partArray->GetEntriesFast())+1);
b2f864d7 408 // if ( (fHadronicMuons == kFALSE) && ( (gen->GetName() == "Pions") || (gen->GetName() == "Kaons") ) )
409 // { AliInfo(Form("This generator %s is finally not generated. This is option for hadronic muons.",gen->GetName() ) ); }
410 // else {
84954c47 411 gen->SetNumberParticles(npart);
412 gen->Generate();
413 entry->SetLast(partArray->GetEntriesFast());
414 preventry = entry;
b2f864d7 415 // }
84954c47 416 }
417 }
418 next.Reset();
17016a57 419 // Tesitng primordial trigger : Muon pair in the MUON spectrometer acceptance and pTCut
84954c47 420 Int_t iPart;
421 fNGenerated++;
422 Int_t numberOfMuons=0;
423 // printf(">>>fNGenerated is %d\n",fNGenerated);
424 for(iPart=0; iPart<partArray->GetEntriesFast(); iPart++){
84954c47 425 if ( (TMath::Abs(gAlice->GetMCApp()->Particle(iPart)->GetPdgCode())==13) &&
426 (gAlice->GetMCApp()->Particle(iPart)->Theta()*180./TMath::Pi()>fMuonThetaMinCut) &&
427 (gAlice->GetMCApp()->Particle(iPart)->Theta()*180./TMath::Pi()<fMuonThetaMaxCut) &&
428 (gAlice->GetMCApp()->Particle(iPart)->Pt()>fMuonPtCut) ) {
429 gAlice->GetMCApp()->Particle(iPart)->SetProductionVertex(fVertex.At(0), fVertex.At(1), fVertex.At(2), 0.);
430 numberOfMuons++;
431 }
432 }
433 // printf(">>> Number of Muons is %d \n", numberOfMuons);
9538aedd 434 if (numberOfMuons >= fMuonMultiplicity ) primordialTrigger = kTRUE;
84954c47 435 }
84954c47 436 fNSucceded++;
b2f864d7 437
438 AliDebug(5,Form("Generated Events are %d and Succeeded Events are %d",fNGenerated,fNSucceded));
84954c47 439}
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