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995e33f0 | 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 * | |
995e33f0 | 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: AliGenTunedOnPbPb.cxx 51126 2013-08-19 13:37:49Z fnoferin $ */ | |
17 | ||
18 | // Parameterisation based on 5.5 ATeV PbPb data | |
19 | // pi,K, p , K0, lambda, phi, Xi, Omega spectra, v2, v3 (no jets!) | |
20 | // Author: fnoferin@cern.ch | |
21 | ||
22 | #include <TArrayF.h> | |
23 | #include <TCanvas.h> | |
24 | #include <TClonesArray.h> | |
25 | #include <TDatabasePDG.h> | |
26 | #include <TF1.h> | |
27 | #include <TH1.h> | |
28 | #include <TPDGCode.h> | |
29 | #include <TParticle.h> | |
30 | #include <TROOT.h> | |
31 | #include <TVirtualMC.h> | |
61494342 | 32 | #include <TLorentzVector.h> |
995e33f0 | 33 | |
34 | #include "AliConst.h" | |
35 | #include "AliDecayer.h" | |
36 | #include "AliGenEventHeaderTunedPbPb.h" | |
37 | #include "AliLog.h" | |
38 | #include "AliRun.h" | |
39 | #include "AliGenTunedOnPbPb.h" | |
40 | ||
41 | ClassImp(AliGenTunedOnPbPb) | |
42 | ||
43 | // set default parameters for 10-20% centrality | |
44 | Int_t AliGenTunedOnPbPb::fgPdgInput[fgNspecies] = {211,-211,111,321,-321,2212,-2212,310,3122,-3122,333,3312,-3312,3334,-3334}; | |
45 | Float_t AliGenTunedOnPbPb::fgMult[fgNspecies] = {450,450,450,70,70,21,21,70,20,20,8,2.4,2.4,0.4,0.4}; | |
46 | ||
47 | Float_t AliGenTunedOnPbPb::fgV3Overv2 = 6.25000000000000000e-01; | |
48 | Float_t AliGenTunedOnPbPb::fgEventplane=0; | |
49 | ||
50 | TF1 *AliGenTunedOnPbPb::fgV2 = NULL; | |
51 | ||
52 | //_____________________________________________________________________________ | |
53 | AliGenTunedOnPbPb::AliGenTunedOnPbPb() | |
54 | :AliGenerator(), | |
55 | fCmin(0.), | |
56 | fCmax(100.), | |
57 | fChangeWithCentrality(kFALSE), | |
61494342 | 58 | fYMaxValue(2.0), |
59 | fYlimitForFlatness(2.0), | |
60 | fYdecreaseSp(0.2), | |
61 | fYdecreaseV2(0.2) | |
995e33f0 | 62 | { |
63 | // | |
64 | // Default constructor | |
65 | // | |
66 | SetCutVertexZ(); | |
67 | SetPtRange(); | |
68 | ||
69 | for(Int_t i=0;i < fgNspecies;i++){ | |
70 | fgHSpectrum[i] = NULL; | |
71 | fgHv2[i] = NULL; | |
72 | } | |
73 | } | |
74 | ||
75 | //_____________________________________________________________________________ | |
76 | AliGenTunedOnPbPb::~AliGenTunedOnPbPb() | |
77 | { | |
78 | // | |
79 | // Standard destructor | |
80 | // | |
81 | } | |
82 | ||
83 | //_____________________________________________________________________________ | |
84 | void AliGenTunedOnPbPb::Init() | |
85 | { | |
86 | // | |
87 | // Initialise the generator | |
88 | // | |
89 | ||
90 | // define histos | |
91 | } | |
92 | ||
93 | ||
94 | //_____________________________________________________________________________ | |
95 | void AliGenTunedOnPbPb::Generate() | |
96 | { | |
97 | // | |
98 | // Generate one trigger | |
99 | // | |
100 | ||
101 | Float_t avCentr = (fCmin+fCmax)*0.5; | |
102 | ||
103 | Float_t centrality = avCentr; | |
104 | ||
105 | if(fChangeWithCentrality) centrality = fCmin + gRandom->Rndm()*(fCmax-fCmin); | |
106 | ||
107 | SetParameters(centrality); | |
108 | ||
b733a8b0 | 109 | if(!fChangeWithCentrality){ |
110 | Float_t in=0; | |
111 | for(Int_t i=0;i < fgNspecies;i++){ | |
112 | in=0; | |
113 | if(fgHSpectrum[i]){ | |
114 | for(Int_t j=1;j<=fgHSpectrum[i]->GetNbinsX();j++){ | |
115 | in += fgHSpectrum[i]->GetBinContent(j)*fgHSpectrum[i]->GetBinWidth(j); | |
116 | } | |
117 | } | |
118 | ||
119 | // replace n-particles with the one in input file if centralidy dependece was disable | |
120 | fgMult[i] = in; | |
121 | } | |
122 | } | |
123 | ||
124 | ||
995e33f0 | 125 | TMCProcess statusPdg[fgNspecies] = {kPPrimary,kPPrimary,kPPrimary,kPPrimary,kPPrimary,kPPrimary,kPPrimary,kPPrimary,kPPrimary,kPPrimary,kPPrimary,kPPrimary,kPPrimary,kPPrimary,kPPrimary}; |
126 | ||
127 | Float_t parV2scaling[3] = {1,0.202538,-0.00214468}; | |
128 | ||
129 | Float_t scaleV2 = 1.0; | |
130 | ||
131 | TDatabasePDG *pdgD = TDatabasePDG::Instance(); | |
132 | ||
133 | if(fChangeWithCentrality){ | |
134 | parV2scaling[0] = 1. / (1 + parV2scaling[1]*avCentr + parV2scaling[2]*avCentr*avCentr); // normalize to average centrality | |
135 | ||
136 | scaleV2 = parV2scaling[0]*(1 + parV2scaling[1]*centrality + parV2scaling[2]*centrality*centrality); // apply the trand of v2 w.r.t. centrality | |
137 | } | |
138 | ||
139 | fgV2->SetParameter(2,fgV3Overv2); | |
140 | ||
141 | Float_t psi = gRandom->Rndm()*TMath::Pi(); | |
142 | fgEventplane = psi; | |
143 | Float_t psi3 = gRandom->Rndm()*TMath::Pi()*2/3; | |
3dc8ab06 | 144 | Float_t psi4 = gRandom->Rndm()*TMath::Pi()*2/4; |
995e33f0 | 145 | fgV2->SetParameter(1,psi); |
146 | fgV2->SetParameter(3,psi3); | |
3dc8ab06 | 147 | fgV2->SetParameter(4,psi4); |
995e33f0 | 148 | |
149 | Int_t npart = 0; | |
150 | ||
151 | Float_t origin0[3]; | |
152 | for (Int_t j=0;j<3;j++) origin0[j]=fOrigin[j]; | |
153 | Float_t time; | |
154 | time = fTimeOrigin; | |
155 | if(fVertexSmear == kPerEvent) { | |
156 | Vertex(); | |
157 | for (Int_t j=0; j < 3; j++) origin0[j] = fVertex[j]; | |
158 | time = fTime; | |
159 | } // if kPerEvent | |
160 | ||
161 | printf("Generate event with centrality = %3.1f%c, |y|<%4.1f\n",centrality,'%',fYMaxValue); | |
162 | ||
163 | for(Int_t isp=0;isp < fgNspecies;isp++){ | |
164 | if(! fgHSpectrum[isp]) continue; | |
165 | ||
b733a8b0 | 166 | Int_t npartSp = Int_t(fgMult[isp]*2*fYMaxValue + gRandom->Rndm()); |
167 | ||
168 | printf("Total number of %i = %i\n",fgPdgInput[isp],npartSp); | |
995e33f0 | 169 | |
b733a8b0 | 170 | for(Int_t ipart =0; ipart < npartSp; ipart++){ |
995e33f0 | 171 | Int_t pdg = fgPdgInput[isp]; |
172 | ||
173 | Double_t y = gRandom->Rndm()*2*fYMaxValue - fYMaxValue; | |
61494342 | 174 | Double_t ytanh = TMath::TanH(y); |
995e33f0 | 175 | Double_t pt = fgHSpectrum[isp]->GetRandom(); |
995e33f0 | 176 | Double_t mass = pdgD->GetParticle(pdg)->Mass(); |
177 | Double_t mt2 = pt*pt + mass*mass; | |
61494342 | 178 | Double_t pz = ytanh*TMath::Sqrt(mt2)/TMath::Sqrt(1-ytanh*ytanh); |
179 | Double_t etot = TMath::Sqrt(mt2 + pz*pz); | |
180 | TLorentzVector tempVect(pt,0,pz,etot); | |
181 | Double_t eta = tempVect.PseudoRapidity(); | |
182 | Double_t scaleEtaV2 = 1; // set the eta dependence | |
183 | if(TMath::Abs(y)> fYlimitForFlatness) scaleEtaV2 = 1 - fYdecreaseV2*(TMath::Abs(y) - fYlimitForFlatness); | |
184 | ||
185 | if(fgHv2[isp]) fgV2->SetParameter(0,fgHv2[isp]->Interpolate(pt) * scaleV2 * scaleEtaV2); | |
186 | else fgV2->SetParameter(0,0.); | |
995e33f0 | 187 | Double_t phi = fgV2->GetRandom(-TMath::Pi(),TMath::Pi()); |
188 | Double_t px = pt*TMath::Cos(phi); | |
189 | Double_t py = pt*TMath::Sin(phi); | |
2942f542 | 190 | Float_t p[3] = {static_cast<Float_t>(px),static_cast<Float_t>(py),static_cast<Float_t>(pz)}; |
995e33f0 | 191 | Float_t polar[3] = {0.,0.,0.}; |
192 | ||
61494342 | 193 | if(TMath::Abs(y)< fYlimitForFlatness || gRandom->Rndm() < 1 - fYdecreaseSp*(TMath::Abs(y) - fYlimitForFlatness)){// check on pseudorapidity distribution |
194 | // printf("%f %f\n",eta,phi - psi); // for debugging | |
195 | PushTrack(1, -1, pdg, p, origin0, polar, time, statusPdg[isp], npart, 1., 1); | |
196 | KeepTrack(npart); | |
197 | npart++; | |
198 | } | |
995e33f0 | 199 | } |
200 | } | |
201 | ||
202 | TArrayF eventVertex; | |
203 | eventVertex.Set(3); | |
204 | eventVertex[0] = origin0[0]; | |
205 | eventVertex[1] = origin0[1]; | |
206 | eventVertex[2] = origin0[2]; | |
207 | ||
208 | // Header | |
209 | AliGenEventHeaderTunedPbPb* header = new AliGenEventHeaderTunedPbPb("tunedOnPbPb"); | |
210 | // Event Vertex | |
211 | header->SetPrimaryVertex(eventVertex); | |
212 | header->SetInteractionTime(time); | |
213 | header->SetNProduced(npart); | |
214 | header->SetCentrality(centrality); | |
215 | header->SetPsi2(psi); | |
216 | header->SetPsi3(psi3); | |
3dc8ab06 | 217 | header->SetPsi4(psi4); |
995e33f0 | 218 | gAlice->SetGenEventHeader(header); |
219 | } | |
220 | ||
221 | void AliGenTunedOnPbPb::SetPtRange(Float_t ptmin, Float_t ptmax) { | |
222 | AliGenerator::SetPtRange(ptmin, ptmax); | |
223 | } | |
224 | //_____________________________________________________________________________ | |
225 | TH1F *AliGenTunedOnPbPb::GetMultVsCentrality(Int_t species){ | |
226 | char title[100]; | |
227 | snprintf(title,100,"pdg = %i;centrality;dN/dy",fgPdgInput[species]); | |
228 | TH1F *h = new TH1F("multVsCentr",title,100,0,100); | |
229 | ||
230 | for(Int_t i=1;i<=100;i++){ | |
231 | Float_t x = i+0.5; | |
232 | SetParameters(x); | |
233 | h->SetBinContent(i,fgMult[species]); | |
234 | } | |
235 | ||
236 | return h; | |
237 | } | |
238 | //_____________________________________________________________________________ | |
239 | void AliGenTunedOnPbPb::SetParameters(Float_t centrality){ | |
240 | ||
3dc8ab06 | 241 | if(!fgV2) fgV2 = new TF1("fv2Par","TMath::Max(0.,(1 + 2*[0]*cos(2*(x-[1])) + 2*[0]*[2]*cos(3*(x-[3])) + [0]*[2]*cos(4*(x-[4]))))",-TMath::Pi(),TMath::Pi()); // v4 is approx. 0.5*v3 |
995e33f0 | 242 | |
243 | Float_t fr[9] = {0.,0.,0.,0.,0.,0.,0.,0.,0.}; | |
244 | ||
245 | if(centrality < 7.5){ | |
246 | fr[0] = (7.5 - centrality)/5.; | |
247 | fr[1] = (centrality-2.5)/5.; | |
248 | } | |
249 | else if(centrality < 15){ | |
250 | fr[1] = (15-centrality)/7.5; | |
251 | fr[2] = (centrality-7.5)/7.5; | |
252 | } | |
253 | else if(centrality < 25){ | |
254 | fr[2] = (25-centrality)/10.; | |
255 | fr[3] = (centrality-15)/10.; | |
256 | } | |
257 | else if(centrality < 35){ | |
258 | fr[3] = (35-centrality)/10.; | |
259 | fr[4] = (centrality-25)/10.; | |
260 | } | |
261 | else if(centrality < 45){ | |
262 | fr[4] = (45-centrality)/10.; | |
263 | fr[5] = (centrality-35)/10.; | |
264 | } | |
265 | else if(centrality < 55){ | |
266 | fr[5] = (55-centrality)/10.; | |
267 | fr[6] = (centrality-45)/10.; | |
268 | } | |
269 | else if(centrality < 65){ | |
270 | fr[6] = (65-centrality)/10.; | |
271 | fr[7] = (centrality-55)/10.; | |
272 | } | |
273 | else if(centrality < 75){ | |
274 | fr[7] = (75-centrality)/10.; | |
275 | fr[8] = (centrality-65)/10.; | |
276 | } | |
277 | else{ | |
278 | fr[8] = 1.0; | |
279 | } | |
280 | ||
281 | // parameters as a function of centrality | |
61494342 | 282 | Float_t multCent[9*fgNspecies] = {733.,733.,733.,109.,109.,34.,34.,109.,28.,28.,11.5,3.1,3.1,0.5,0.5, |
283 | 606.,606.,606.,91.,91.,28.,28.,91.,24.,24.,9.,2.7,2.7,0.45,0.45, | |
284 | 455.,455.,455.,68.,68.,21.,21.,68.,20.,20.,8.,2.4,2.4,0.4,0.4, | |
285 | 307.,307.,307.,46.,46.,14.5,14.5,46.,14.,14.,5.5,1.5,1.5,0.2,0.2, | |
286 | 201.,201.,201.,30.,30.,9.6,9.6,30.,9.,9.,3.5,0.9,0.9,0.08,0.08, | |
287 | 124.,124.,124.,18.3,18.3,6.1,6.1,18.3,5.1,5.1,2.2,0.6,0.6,0.055,0.055, | |
288 | 71.,71.,71.,10.2,10.2,3.6,3.6,10.2,2.6,2.6,1.4,0.36,0.36,0.035,0.035, | |
289 | 37.,37.,37.,5.1,5.1,2.,2.,5.1,1.5,1.5,0.5,0.02,0.02,0.015,0.015, | |
995e33f0 | 290 | 17.,17.,17.,2.3,2.3,0.9,0.9,2.3,0.6,0.6,0.16,0.006,0.006,0.005,0.005}; |
291 | ||
292 | Float_t v3Overv2Cent[9] = {1.2,0.82,0.625,0.5,0.45,0.4,0.37,0.3,0.3}; | |
293 | ||
b733a8b0 | 294 | fgV3Overv2 = 0; |
295 | for(Int_t j=0;j < 9;j++) | |
296 | fgV3Overv2 += fr[j]*v3Overv2Cent[j]; | |
297 | ||
995e33f0 | 298 | // set parameters for current centrality |
299 | for(Int_t i=0;i < fgNspecies;i++){ | |
300 | fgMult[i] = 0; | |
301 | ||
302 | for(Int_t j=0;j < 9;j++){ | |
303 | fgMult[i] += fr[j]*multCent[i+j*fgNspecies]; | |
304 | } | |
305 | } | |
995e33f0 | 306 | |
307 | if(centrality > 80){ | |
308 | for(Int_t i=0;i < fgNspecies;i++) | |
309 | fgMult[i] /= TMath::Log(centrality-77.); | |
310 | } | |
995e33f0 | 311 | } |