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84954c47 | 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 | ||
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 | |
45 | ClassImp(AliGenMUONCocktail) | |
46 | ||
47 | ||
48 | //________________________________________________________________________ | |
49 | AliGenMUONCocktail::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; | |
b72a1716 | 67 | fInvMassCut = kFALSE; |
68 | fInvMassMinCut = 0.; | |
69 | fInvMassMaxCut = 100.; | |
84954c47 | 70 | } |
71 | //_________________________________________________________________________ | |
72 | AliGenMUONCocktail::AliGenMUONCocktail(const AliGenMUONCocktail & cocktail): | |
73 | AliGenCocktail(cocktail) | |
74 | { | |
75 | // Copy constructor | |
17016a57 | 76 | fFastGlauber =0x0; |
84954c47 | 77 | fTotalRate =0; |
78 | fNSucceded=0; | |
79 | fNGenerated=0; | |
80 | fMuonMultiplicity=1; | |
81 | fMuonPtCut= 1.; | |
82 | fMuonThetaMinCut=171.; | |
17016a57 | 83 | fMuonThetaMaxCut=178.; |
84 | fLowImpactParameter = 0.; | |
85 | fHighImpactParameter = 5.; | |
86 | fAverageImpactParameter =0.; | |
87 | fNumberOfCollisions = 0.; | |
88 | fNumberOfParticipants = 0.; | |
89 | fHadronicMuons = kTRUE; | |
b72a1716 | 90 | fInvMassCut = kFALSE; |
91 | fInvMassMinCut = 0.; | |
92 | fInvMassMaxCut = 100.; | |
84954c47 | 93 | } |
94 | //_________________________________________________________________________ | |
95 | AliGenMUONCocktail::~AliGenMUONCocktail() | |
96 | { | |
97 | // Destructor | |
17016a57 | 98 | if (fFastGlauber) delete fFastGlauber; |
84954c47 | 99 | } |
100 | ||
101 | //_________________________________________________________________________ | |
102 | void AliGenMUONCocktail::Init() | |
103 | { | |
17016a57 | 104 | // NN cross section |
105 | Double_t sigmaReaction = 0.072; // MinBias NN cross section for PbPb LHC energies http://arxiv.org/pdf/nucl-ex/0302016 | |
106 | ||
107 | // Initialising Fast Glauber object | |
108 | fFastGlauber = new AliFastGlauber(); | |
109 | fFastGlauber->SetPbPbLHC(); | |
110 | fFastGlauber->SetNNCrossSection(sigmaReaction*1000.); //Expected NN cross-section in mb at LHC with diffractive part http://arxiv.org/pdf/nucl-ex/0302016 ) | |
111 | fFastGlauber->Init(1); | |
112 | ||
113 | // Calculating average number of collisions | |
114 | Int_t ib=0; | |
115 | Int_t ibmax=10000; | |
116 | Double_t b = 0.; | |
117 | fAverageImpactParameter=0.; | |
118 | fNumberOfCollisions = 0.; | |
119 | fNumberOfParticipants = 0.; | |
120 | for(ib=0; ib<ibmax; ib++) { | |
121 | b = fFastGlauber->GetRandomImpactParameter(fLowImpactParameter,fHighImpactParameter); | |
122 | fAverageImpactParameter+=b; | |
123 | fNumberOfCollisions += fFastGlauber->GetNumberOfCollisions( b )/(1.-TMath::Exp(-fFastGlauber->GetNumberOfCollisions(b))); | |
124 | fNumberOfParticipants += fFastGlauber->GetNumberOfParticipants( b ); | |
125 | } | |
126 | fAverageImpactParameter/= ((Double_t) ibmax); | |
127 | fNumberOfCollisions /= ((Double_t) ibmax); | |
128 | fNumberOfParticipants /= ((Double_t) ibmax);; | |
129 | AliInfo(Form("<b>=%4.2f, <Ncoll>=%5.1f and and <Npart>=%5.1f",b, fNumberOfCollisions, fNumberOfParticipants)); | |
130 | ||
131 | // Estimating shadowing on charm a beaty production | |
132 | // ----------------------------------------------------- | |
133 | // Extrapolation of the cross sections from $p-p$ to \mbox{Pb--Pb} | |
134 | // interactions | |
135 | // is done by means of the Glauber model. For the impact parameter dependence | |
136 | // of the shadowing factor we use a simple formula: | |
137 | // $C_{sh}(b) = C_{sh}(0) + (1 - C_{sh}(0))(b/16~fm)4$, | |
138 | // motivated by the theoretical predictions (see e.g. | |
139 | // V. Emelyanov et al., Phys. Rev. C61, 044904 (2000)) and HIJING | |
140 | // simulations showing an almost flat behaviour | |
141 | // up to 10~$fm$ and a rapid increase to 1 for larger impact parameters. | |
142 | // C_{sh}(0) = 0.60 for Psi and 0.76 for Upsilon (Smba communication). | |
143 | // for open charm and beauty is 0.65 and 0.84 | |
144 | // ----------------------------------------------------- | |
145 | Double_t charmshadowing = 0.65 + (1.0-0.65)*TMath::Power(fAverageImpactParameter/16.,4); | |
146 | Double_t beautyshadowing = 0.84 + (1.0-0.84)*TMath::Power(fAverageImpactParameter/16.,4); | |
147 | Double_t charmoniumshadowing = 0.60 + (1.0-0.60)*TMath::Power(fAverageImpactParameter/16.,4); | |
148 | Double_t beautoniumshadowing = 0.76 + (1.0-0.76)*TMath::Power(fAverageImpactParameter/16.,4); | |
149 | if (fAverageImpactParameter>16.) { | |
150 | charmoniumshadowing = 1.0; | |
151 | beautoniumshadowing = 1.0; | |
152 | charmshadowing = 1.0; | |
153 | beautyshadowing= 1.0; | |
154 | } | |
155 | AliInfo(Form("Shadowing for charmonium and beautonium production are %4.2f and %4.2f respectively",charmoniumshadowing,beautoniumshadowing)); | |
156 | AliInfo(Form("Shadowing for charm and beauty production are %4.2f and %4.2f respectively",charmshadowing,beautyshadowing)); | |
84954c47 | 157 | |
17016a57 | 158 | // Defining MUON physics cocktail |
84954c47 | 159 | // Kinematical limits for particle generation |
17016a57 | 160 | Double_t ptMin = fPtMin; |
161 | Double_t ptMax = fPtMax; | |
162 | Double_t yMin = fYMin;; | |
163 | Double_t yMax = fYMax;; | |
164 | Double_t phiMin = fPhiMin*180./TMath::Pi(); | |
165 | Double_t phiMax = fPhiMax*180./TMath::Pi(); | |
166 | 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)); | |
167 | ||
168 | // Generating J/Psi Physics | |
b2f864d7 | 169 | // Using CFD scaled distribution (see http://clrwww.in2p3.fr/DIMUON2004/talks/sgrigoryan.pdf ) |
170 | AliGenParam * genjpsi = new AliGenParam(1, AliGenMUONlib::kJpsi, "CDF scaled", "Jpsi"); | |
17016a57 | 171 | genjpsi->SetPtRange(0,100.); // 4pi generation |
9538aedd | 172 | genjpsi->SetYRange(-8.,8); |
173 | genjpsi->SetPhiRange(0.,360.); | |
174 | genjpsi->SetForceDecay(kDiMuon); | |
175 | genjpsi->SetTrackingFlag(1); | |
17016a57 | 176 | // Calculation of the particle multiplicity per event in the muonic channel |
177 | Double_t ratiojpsi; // Ratio with respect to the reaction cross-section for the muonic channel in the kinematics limit of the MUONCocktail | |
178 | Double_t sigmajpsi = 31.0e-6 * charmoniumshadowing; // section "6.7 Quarkonia Production" table 6.5 for pp times shadowing | |
179 | Double_t brjpsi = 0.0588; // Branching Ratio for JPsi PDG PRC15 (200) | |
9538aedd | 180 | genjpsi->Init(); // Generating pT and Y parametrsation for the 4pi |
181 | ratiojpsi = sigmajpsi * brjpsi * fNumberOfCollisions / sigmaReaction * genjpsi->GetRelativeArea(ptMin,ptMax,yMin,yMax,phiMin,phiMax); | |
17016a57 | 182 | AliInfo(Form("Jpsi production cross-section in pp with shadowing %5.3g barns",sigmajpsi)); |
183 | AliInfo(Form("Jpsi production probability per collisions in acceptance via the muonic channel %5.3g",ratiojpsi)); | |
84954c47 | 184 | // Generation in the kinematical limits of AliGenMUONCocktail |
9538aedd | 185 | genjpsi->SetPtRange(ptMin, ptMax); |
186 | genjpsi->SetYRange(yMin, yMax); | |
187 | genjpsi->SetPhiRange(phiMin, phiMax); | |
188 | genjpsi->Init(); // Generating pT and Y parametrsation in the desired kinematic range | |
84954c47 | 189 | // Adding Generator |
9538aedd | 190 | AddGenerator(genjpsi, "Jpsi", ratiojpsi); |
191 | fTotalRate+=ratiojpsi; | |
84954c47 | 192 | |
88e5db43 | 193 | // Generating Psi prime Physics |
b2f864d7 | 194 | // Using CFD scaled distribution (see http://clrwww.in2p3.fr/DIMUON2004/talks/sgrigoryan.pdf ) |
195 | AliGenParam * genpsiP = new AliGenParam(1, AliGenMUONlib::kPsiP, "CDF scaled", "PsiP"); | |
17016a57 | 196 | genpsiP->SetPtRange(0,100.);// 4pi generation |
88e5db43 | 197 | genpsiP->SetYRange(-8.,8); |
198 | genpsiP->SetPhiRange(0.,360.); | |
199 | genpsiP->SetForceDecay(kDiMuon); | |
200 | genpsiP->SetTrackingFlag(1); | |
201 | // Calculation of the paritcle multiplicity per event in the muonic channel | |
17016a57 | 202 | Double_t ratiopsiP; // Ratio with respect to the reaction cross-section for the muonic channel in the kinematics limit of the MUONCocktail |
203 | Double_t sigmapsiP = 4.68e-6 * charmoniumshadowing; // section "6.7 Quarkonia Production" table 6.5 for pp times shadowing | |
204 | Double_t brpsiP = 0.0103; // Branching Ratio for PsiP | |
88e5db43 | 205 | genpsiP->Init(); // Generating pT and Y parametrsation for the 4pi |
206 | ratiopsiP = sigmapsiP * brpsiP * fNumberOfCollisions / sigmaReaction * genpsiP->GetRelativeArea(ptMin,ptMax,yMin,yMax,phiMin,phiMax); | |
17016a57 | 207 | AliInfo(Form("Psi prime production cross-section in pp with shadowing %5.3g barns",sigmapsiP)); |
208 | AliInfo(Form("Psi prime production probability per collisions in acceptance via the muonic channel %5.3g",ratiopsiP)); | |
88e5db43 | 209 | // Generation in the kinematical limits of AliGenMUONCocktail |
210 | genpsiP->SetPtRange(ptMin, ptMax); | |
211 | genpsiP->SetYRange(yMin, yMax); | |
212 | genpsiP->SetPhiRange(phiMin, phiMax); | |
213 | genpsiP->Init(); // Generating pT and Y parametrsation in the desired kinematic range | |
214 | // Adding Generator | |
215 | AddGenerator(genpsiP, "PsiP", ratiopsiP); | |
216 | fTotalRate+=ratiopsiP; | |
217 | ||
17016a57 | 218 | // Generating Upsilon Physics |
b2f864d7 | 219 | // Using CFD scaled distribution (see http://clrwww.in2p3.fr/DIMUON2004/talks/sgrigoryan.pdf ) |
220 | AliGenParam * genupsilon = new AliGenParam(1, AliGenMUONlib::kUpsilon, "CDF scaled", "Upsilon"); | |
9538aedd | 221 | genupsilon->SetPtRange(0,100.); |
222 | genupsilon->SetYRange(-8.,8); | |
223 | genupsilon->SetPhiRange(0.,360.); | |
224 | genupsilon->SetForceDecay(kDiMuon); | |
225 | genupsilon->SetTrackingFlag(1); | |
17016a57 | 226 | Double_t ratioupsilon; // Ratio with respect to the reaction cross-section for the muonic channel in the kinematics limit of the MUONCocktail |
227 | Double_t sigmaupsilon = 0.501e-6 * beautoniumshadowing; // section "6.7 Quarkonia Production" table 6.5 for pp times shadowing | |
228 | Double_t brupsilon = 0.0248; // Branching Ratio for Upsilon | |
9538aedd | 229 | genupsilon->Init(); // Generating pT and Y parametrsation for the 4pi |
230 | ratioupsilon = sigmaupsilon * brupsilon * fNumberOfCollisions / sigmaReaction * genupsilon->GetRelativeArea(ptMin,ptMax,yMin,yMax,phiMin,phiMax); | |
17016a57 | 231 | AliInfo(Form("Upsilon 1S production cross-section in pp with shadowing %5.3g barns",sigmaupsilon)); |
232 | AliInfo(Form("Upsilon 1S production probability per collisions in acceptance via the muonic channel %5.3g",ratioupsilon)); | |
9538aedd | 233 | genupsilon->SetPtRange(ptMin, ptMax); |
234 | genupsilon->SetYRange(yMin, yMax); | |
235 | genupsilon->SetPhiRange(phiMin, phiMax); | |
236 | genupsilon->Init(); // Generating pT and Y parametrsation in the desired kinematic range | |
237 | AddGenerator(genupsilon,"Upsilon", ratioupsilon); | |
238 | fTotalRate+=ratioupsilon; | |
84954c47 | 239 | |
17016a57 | 240 | // Generating UpsilonP Physics |
b2f864d7 | 241 | // Using CFD scaled distribution (see http://clrwww.in2p3.fr/DIMUON2004/talks/sgrigoryan.pdf ) |
242 | AliGenParam * genupsilonP = new AliGenParam(1, AliGenMUONlib::kUpsilonP, "CDF Scaled", "UpsilonP"); | |
88e5db43 | 243 | genupsilonP->SetPtRange(0,100.); |
244 | genupsilonP->SetYRange(-8.,8); | |
245 | genupsilonP->SetPhiRange(0.,360.); | |
246 | genupsilonP->SetForceDecay(kDiMuon); | |
247 | genupsilonP->SetTrackingFlag(1); | |
17016a57 | 248 | Double_t ratioupsilonP; // Ratio with respect to the reaction cross-section for the muonic channel in the kinematics limit of the MUONCocktail |
249 | Double_t sigmaupsilonP = 0.246e-6 * beautoniumshadowing; // section "6.7 Quarkonia Production" table 6.5 for pp times shadowing | |
250 | Double_t brupsilonP = 0.0131; // Branching Ratio for UpsilonP | |
88e5db43 | 251 | genupsilonP->Init(); // Generating pT and Y parametrsation for the 4pi |
252 | ratioupsilonP = sigmaupsilonP * brupsilonP * fNumberOfCollisions / sigmaReaction * genupsilonP->GetRelativeArea(ptMin,ptMax,yMin,yMax,phiMin,phiMax); | |
17016a57 | 253 | AliInfo(Form("Upsilon 2S production cross-section in pp with shadowing %5.3g barns",sigmaupsilonP)); |
254 | AliInfo(Form("Upsilon 2S production probability per collisions in acceptance via the muonic channel %5.3g",ratioupsilonP)); | |
88e5db43 | 255 | genupsilonP->SetPtRange(ptMin, ptMax); |
256 | genupsilonP->SetYRange(yMin, yMax); | |
257 | genupsilonP->SetPhiRange(phiMin, phiMax); | |
258 | genupsilonP->Init(); // Generating pT and Y parametrsation in the desired kinematic range | |
259 | AddGenerator(genupsilonP,"UpsilonP", ratioupsilonP); | |
260 | fTotalRate+=ratioupsilonP; | |
261 | ||
17016a57 | 262 | // Generating UpsilonPP Physics |
b2f864d7 | 263 | // Using CFD scaled distribution (see http://clrwww.in2p3.fr/DIMUON2004/talks/sgrigoryan.pdf ) |
264 | AliGenParam * genupsilonPP = new AliGenParam(1, AliGenMUONlib::kUpsilonPP, "CDF Scaled", "UpsilonPP"); | |
88e5db43 | 265 | genupsilonPP->SetPtRange(0,100.); |
266 | genupsilonPP->SetYRange(-8.,8); | |
267 | genupsilonPP->SetPhiRange(0.,360.); | |
268 | genupsilonPP->SetForceDecay(kDiMuon); | |
269 | genupsilonPP->SetTrackingFlag(1); | |
17016a57 | 270 | Double_t ratioupsilonPP; // Ratio with respect to the reaction cross-section for the muonic channel in the kinematics limit of the MUONCocktail |
271 | Double_t sigmaupsilonPP = 0.100e-6 * beautoniumshadowing; // section "6.7 Quarkonia Production" table 6.5 for pp times shadowing | |
272 | Double_t brupsilonPP = 0.0181; // Branching Ratio for UpsilonPP | |
88e5db43 | 273 | genupsilonPP->Init(); // Generating pT and Y parametrsation for the 4pi |
274 | ratioupsilonPP = sigmaupsilonPP * brupsilonPP * fNumberOfCollisions / sigmaReaction * genupsilonPP->GetRelativeArea(ptMin,ptMax,yMin,yMax,phiMin,phiMax); | |
17016a57 | 275 | AliInfo(Form("Upsilon 3S production cross-section in pp with shadowing %5.3g barns",sigmaupsilonPP)); |
276 | AliInfo(Form("Upsilon 3S production probability per collisions in acceptance via the muonic channel %5.3g",ratioupsilonPP)); | |
88e5db43 | 277 | genupsilonPP->SetPtRange(ptMin, ptMax); |
278 | genupsilonPP->SetYRange(yMin, yMax); | |
279 | genupsilonPP->SetPhiRange(phiMin, phiMax); | |
280 | genupsilonPP->Init(); // Generating pT and Y parametrsation in the desired kinematic range | |
281 | AddGenerator(genupsilonPP,"UpsilonPP", ratioupsilonPP); | |
282 | fTotalRate+=ratioupsilonPP; | |
283 | ||
17016a57 | 284 | // Generating non-correlated Charm Physics |
b2f864d7 | 285 | AliGenParam * gencharm = new AliGenParam(1, AliGenMUONlib::kCharm, "pp", "Charm"); |
9538aedd | 286 | gencharm->SetPtRange(0,100.); |
287 | gencharm->SetYRange(-8.,8); | |
288 | gencharm->SetPhiRange(0.,360.); | |
289 | gencharm->SetForceDecay(kSemiMuonic); | |
290 | gencharm->SetTrackingFlag(1); | |
17016a57 | 291 | Double_t ratiocharm; // Ratio with respect to the reaction cross-section for the muonic channel in the kinematics limit of the MUONCocktail |
292 | Double_t sigmacharm = 2. * 6.64e-3 * charmshadowing ; // | |
293 | Double_t brcharm = 0.12; // Branching Ratio for Charm | |
9538aedd | 294 | gencharm->Init(); // Generating pT and Y parametrsation for the 4pi |
17016a57 | 295 | ratiocharm = sigmacharm * brcharm * fNumberOfCollisions / sigmaReaction * gencharm->GetRelativeArea(ptMin,ptMax,yMin,yMax,phiMin,phiMax); |
296 | AliInfo(Form("Charm production cross-section in pp with shadowing %5.3g barns",sigmacharm)); | |
297 | AliInfo(Form("Charm production probability per collisions in acceptance via the semi-muonic channel %5.3g",ratiocharm)); | |
9538aedd | 298 | gencharm->SetPtRange(ptMin, ptMax); |
299 | gencharm->SetYRange(yMin, yMax); | |
300 | gencharm->SetPhiRange(phiMin, phiMax); | |
301 | gencharm->Init(); // Generating pT and Y parametrsation in the desired kinematic range | |
9538aedd | 302 | AddGenerator(gencharm,"Charm", ratiocharm); |
303 | fTotalRate+=ratiocharm; | |
84954c47 | 304 | |
17016a57 | 305 | // Generating non-correlated Beauty Physics |
b2f864d7 | 306 | AliGenParam * genbeauty = new AliGenParam(1, AliGenMUONlib::kBeauty, "pp", "Beauty"); |
9538aedd | 307 | genbeauty->SetPtRange(0,100.); |
308 | genbeauty->SetYRange(-8.,8); | |
309 | genbeauty->SetPhiRange(0.,360.); | |
310 | genbeauty->SetForceDecay(kSemiMuonic); | |
311 | genbeauty->SetTrackingFlag(1); | |
17016a57 | 312 | Double_t ratiobeauty; // Ratio with respect to the reaction cross-section for the muonic channel in the kinematics limit of the MUONCocktail |
313 | Double_t sigmabeauty = 2. * 0.210e-3 * beautyshadowing; // | |
314 | Double_t brbeauty = 0.15; // Branching Ratio for Beauty | |
9538aedd | 315 | genbeauty->Init(); // Generating pT and Y parametrsation for the 4pi |
316 | ratiobeauty = sigmabeauty * brbeauty * fNumberOfCollisions / sigmaReaction * | |
317 | genbeauty->GetRelativeArea(ptMin,ptMax,yMin,yMax,phiMin,phiMax); | |
17016a57 | 318 | AliInfo(Form("Beauty production cross-section in pp with shadowing %5.3g barns",sigmabeauty)); |
319 | AliInfo(Form("Beauty production probability per collisions in acceptance via the semi-muonic channel %5.3g",ratiobeauty)); | |
9538aedd | 320 | genbeauty->SetPtRange(ptMin, ptMax); |
321 | genbeauty->SetYRange(yMin, yMax); | |
322 | genbeauty->SetPhiRange(phiMin, phiMax); | |
323 | genbeauty->Init(); // Generating pT and Y parametrisation in the desired kinematic range | |
9538aedd | 324 | AddGenerator(genbeauty,"Beauty", ratiobeauty); |
325 | fTotalRate+=ratiobeauty; | |
84954c47 | 326 | |
17016a57 | 327 | // Only if hadronic muons are included in the cocktail |
328 | if(fHadronicMuons) { | |
329 | // Generating Pion Physics | |
330 | // The scaling with Npart and Ncoll has been obtained to reproduced tha values presented by Valeri lors de presentatation | |
331 | // a Clermont Ferrand http://pcrochet.home.cern.ch/pcrochet/files/valerie.pdf | |
332 | // b range(fm) Ncoll Npart N_mu pT>0.4 GeV/c | |
333 | // 0 - 3 1982 381 3.62 | |
334 | // 3 - 6 1388 297 3.07 | |
335 | // 6 - 9 674 177 1.76 | |
336 | // 9 - 12 188 71 0.655 | |
337 | // 12 - 16 15 10 0.086 | |
338 | // We found the hadronic muons scales quite well with the number of participants | |
b2f864d7 | 339 | AliGenParam * genpion = new AliGenParam(1, AliGenMUONlib::kPion, "default", "Pion"); |
17016a57 | 340 | genpion->SetPtRange(0,100.); |
341 | genpion->SetYRange(-8.,8); | |
342 | genpion->SetPhiRange(0.,360.); | |
343 | genpion->SetForceDecay(kPiToMu); | |
344 | genpion->SetTrackingFlag(1); | |
345 | Double_t ratiopion; // Ratio with respect to the reaction cross-section for the muonic channel in the kinematics limit of the MUONCocktail | |
346 | Double_t sigmapion = 1.80e-2; // Just for reproducing Valeries's data | |
347 | Double_t brpion = 0.9999; // Branching Ratio for Pion | |
348 | genpion->Init(); // Generating pT and Y parametrsation for the 4pi | |
349 | ratiopion = sigmapion * brpion * (0.93*fNumberOfParticipants+0.07*fNumberOfCollisions) / sigmaReaction * genpion->GetRelativeArea(ptMin,ptMax,yMin,yMax,phiMin,phiMax); | |
350 | AliInfo(Form("Pseudo-Pion production cross-section in pp with shadowing %5.3g barns",sigmapion)); | |
351 | AliInfo(Form("Pion production probability per collisions in acceptance via the muonic channel %5.3g",ratiopion)); | |
352 | genpion->SetPtRange(ptMin, ptMax); | |
353 | genpion->SetYRange(yMin, yMax); | |
354 | genpion->SetPhiRange(phiMin, phiMax); | |
355 | genpion->Init(); // Generating pT and Y parametrsation in the desired kinematic range | |
356 | AddGenerator(genpion,"Pion", ratiopion); | |
357 | fTotalRate+=ratiopion; | |
358 | ||
359 | // Generating Kaon Physics | |
b2f864d7 | 360 | AliGenParam * genkaon = new AliGenParam(1, AliGenMUONlib::kKaon, "default", "Kaon"); |
17016a57 | 361 | genkaon->SetPtRange(0,100.); |
362 | genkaon->SetYRange(-8.,8); | |
363 | genkaon->SetPhiRange(0.,360.); | |
364 | genkaon->SetForceDecay(kKaToMu); | |
365 | genkaon->SetTrackingFlag(1); | |
366 | Double_t ratiokaon; // Ratio with respect to the reaction cross-section for the muonic channel in the kinematics limit of the MUONCocktail | |
367 | Double_t sigmakaon = 2.40e-4; // Valerie presentation Clermont-16-jan-2004 and Alice-int-2002-06 | |
368 | Double_t brkaon = 0.6351 ; // Branching Ratio for Kaon | |
369 | genkaon->Init(); // Generating pT and Y parametrsation for the 4pi | |
370 | ratiokaon = sigmakaon * brkaon * (0.93*fNumberOfParticipants+0.07*fNumberOfCollisions)/ sigmaReaction * genkaon->GetRelativeArea(ptMin,ptMax,yMin,yMax,phiMin,phiMax); | |
371 | AliInfo(Form("Pseudo-kaon production cross-section in pp with shadowing %5.3g barns",sigmakaon)); | |
372 | AliInfo(Form("Kaon production probability per collisions in acceptance via the muonic channel %5.3g",ratiokaon)); | |
373 | genkaon->SetPtRange(ptMin, ptMax); | |
374 | genkaon->SetYRange(yMin, yMax); | |
375 | genkaon->SetPhiRange(phiMin, phiMax); | |
376 | genkaon->Init(); // Generating pT and Y parametrsation in the desired kinematic range | |
377 | AddGenerator(genkaon,"Kaon", ratiokaon); | |
378 | fTotalRate+=ratiokaon; | |
379 | } | |
84954c47 | 380 | } |
381 | ||
382 | //_________________________________________________________________________ | |
383 | void AliGenMUONCocktail::Generate() | |
384 | { | |
385 | // | |
386 | // Generate event | |
387 | TIter next(fEntries); | |
388 | AliGenCocktailEntry *entry = 0; | |
389 | AliGenCocktailEntry *preventry = 0; | |
390 | AliGenerator* gen = 0; | |
84954c47 | 391 | TObjArray *partArray = gAlice->GetMCApp()->Particles(); |
392 | ||
17016a57 | 393 | // Generate the vertex position used by all generators |
84954c47 | 394 | if(fVertexSmear == kPerEvent) Vertex(); |
84954c47 | 395 | |
17016a57 | 396 | // Loop on primordialTrigger |
397 | Bool_t primordialTrigger = kFALSE; | |
9538aedd | 398 | while(!primordialTrigger) { |
b72a1716 | 399 | //Reseting stack |
400 | AliRunLoader * runloader = gAlice->GetRunLoader(); | |
401 | if (runloader) | |
402 | if (runloader->Stack()) | |
403 | runloader->Stack()->Reset(); | |
404 | // Loop over generators and generate events | |
405 | Int_t igen=0; | |
406 | Int_t npart =0; | |
407 | while((entry = (AliGenCocktailEntry*)next())) { | |
408 | gen = entry->Generator(); | |
409 | gen->SetVertex(fVertex.At(0), fVertex.At(1), fVertex.At(2)); | |
410 | if ( (npart = gRandom->Poisson(entry->Rate())) >0 ) { | |
411 | igen++; | |
412 | if (igen == 1) entry->SetFirst(0); | |
413 | else entry->SetFirst((partArray->GetEntriesFast())+1); | |
414 | // if ( (fHadronicMuons == kFALSE) && ( (gen->GetName() == "Pions") || (gen->GetName() == "Kaons") ) ) | |
415 | // { AliInfo(Form("This generator %s is finally not generated. This is option for hadronic muons.",gen->GetName() ) ); } | |
416 | // else { | |
417 | gen->SetNumberParticles(npart); | |
418 | gen->Generate(); | |
419 | entry->SetLast(partArray->GetEntriesFast()); | |
420 | preventry = entry; | |
421 | // } | |
422 | } | |
423 | } | |
424 | next.Reset(); | |
425 | // Testing primordial trigger : Muon pair in the MUON spectrometer acceptance and pTCut | |
426 | Int_t iPart; | |
427 | fNGenerated++; | |
428 | Int_t numberOfMuons=0; | |
429 | // printf(">>>fNGenerated is %d\n",fNGenerated); | |
430 | ||
431 | TObjArray GoodMuons; // Used in the Invariant Mass selection cut | |
432 | ||
433 | for(iPart=0; iPart<partArray->GetEntriesFast(); iPart++){ | |
434 | ||
435 | if ( (TMath::Abs(gAlice->GetMCApp()->Particle(iPart)->GetPdgCode())==13) && | |
436 | (gAlice->GetMCApp()->Particle(iPart)->Theta()*180./TMath::Pi()>fMuonThetaMinCut) && | |
437 | (gAlice->GetMCApp()->Particle(iPart)->Theta()*180./TMath::Pi()<fMuonThetaMaxCut) && | |
438 | (gAlice->GetMCApp()->Particle(iPart)->Pt()>fMuonPtCut) ) { | |
439 | gAlice->GetMCApp()->Particle(iPart)->SetProductionVertex(fVertex.At(0), fVertex.At(1), fVertex.At(2), 0.); | |
440 | GoodMuons.AddLast(gAlice->GetMCApp()->Particle(iPart)); | |
441 | numberOfMuons++; | |
442 | } | |
443 | } | |
444 | ||
445 | // Test the invariant mass of each pair (if cut on Invariant mass is required) | |
446 | Bool_t InvMassRangeOK = kTRUE; | |
447 | if(fInvMassCut && (numberOfMuons>=2) ){ | |
448 | TLorentzVector fV1, fV2, fVtot; | |
449 | InvMassRangeOK = kFALSE; | |
450 | for(iPart=0; iPart<GoodMuons.GetEntriesFast(); iPart++){ | |
451 | TParticle * mu1 = ((TParticle *)GoodMuons.At(iPart)); | |
452 | ||
453 | for(int iPart2=iPart+1; iPart2<GoodMuons.GetEntriesFast(); iPart2++){ | |
454 | TParticle * mu2 = ((TParticle *)GoodMuons.At(iPart2)); | |
455 | ||
456 | fV1.SetPxPyPzE(mu1->Px() ,mu1->Py() ,mu1->Pz() ,mu1->Energy() ); | |
457 | fV2.SetPxPyPzE(mu2->Px() ,mu2->Py() ,mu2->Pz() ,mu2->Energy() ); | |
458 | fVtot = fV1 + fV2; | |
459 | ||
460 | if(fVtot.M()>fInvMassMinCut && fVtot.M()<fInvMassMaxCut) { | |
461 | InvMassRangeOK = kTRUE; | |
462 | break; | |
463 | } | |
464 | } | |
465 | if(InvMassRangeOK) break; // Invariant Mass Cut pass as soon as one pair satisfy the criterion | |
466 | } | |
467 | } | |
468 | ||
469 | ||
470 | if ((numberOfMuons >= fMuonMultiplicity) && InvMassRangeOK ) primordialTrigger = kTRUE; | |
84954c47 | 471 | } |
84954c47 | 472 | fNSucceded++; |
b72a1716 | 473 | |
b2f864d7 | 474 | AliDebug(5,Form("Generated Events are %d and Succeeded Events are %d",fNGenerated,fNSucceded)); |
84954c47 | 475 | } |
476 | ||
477 | ||
478 | ||
479 | ||
480 | ||
481 |