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2c890605 | 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 | ||
18 | // Class to generate correlated Heavy Flavor hadron pairs (one or several pairs | |
19 | // per event) using paramtrized kinematics of quark pairs from some generator | |
20 | // and quark fragmentation functions. | |
21 | // Is a generalisation of AliGenParam class for correlated pairs of hadrons. | |
22 | // In this version quark pairs and fragmentation functions are obtained from | |
b33adf51 | 23 | // ~2.10^6 Pythia6.214 events generated with kCharmppMNRwmi & kBeautyppMNRwmi, |
9fd56238 | 24 | // CTEQ5L PDF and Pt_hard = 2.76 GeV/c for p-p collisions at 7, 10 and 14 TeV, |
25 | // and with kCharmppMNR (Pt_hard = 2.10 GeV/c) & kBeautyppMNR (Pt_hard = 2.75 GeV/c), | |
26 | // CTEQ4L PDF for Pb-Pb at 3.94 TeV, for p-Pb & Pb-p at 8.8 TeV. | |
b33adf51 | 27 | // Decays are performed by Pythia. |
2c890605 | 28 | // Author: S. Grigoryan, LPC Clermont-Fd & YerPhI, Smbat.Grigoryan@cern.ch |
b44c3901 | 29 | // July 07: added quarks in the stack (B. Vulpescu) |
b33adf51 | 30 | // April 09: added energy choice between 10 and 14 TeV (S. Grigoryan) |
9fd56238 | 31 | // Sept 09: added hadron pair composition probabilities via 2D histo (X.M. Zhang) |
32 | // Oct 09: added energy choice between 7, 10, 14 TeV (for p-p), 4 TeV (for Pb-Pb), | |
33 | // 9 TeV (for p-Pb) and -9 TeV (for Pb-p) (S. Grigoryan) | |
5cc3bcd2 | 34 | // April 10: removed "static" from definition of some variables (B. Vulpescu) |
2c890605 | 35 | //------------------------------------------------------------------------- |
b33adf51 | 36 | // How it works (for the given flavor and p-p energy): |
2c890605 | 37 | // |
5cc3bcd2 | 38 | // 1) Reads QQbar kinematical grid (TTree) from the Input file and generates |
2c890605 | 39 | // quark pairs according to the weights of the cells. |
40 | // It is a 5D grid in y1,y2,pt1,pt2 and deltaphi, with occupancy weights | |
41 | // of the cells obtained from Pythia (see details in GetQuarkPair). | |
42 | // 2) Reads "soft" and "hard" fragmentation functions (12 2D-histograms each, | |
43 | // for 12 pt bins) from the Input file, applies to quarks and produces hadrons | |
44 | // (only lower states, with proportions of species obtained from Pythia). | |
45 | // Fragmentation functions are the same for all hadron species and depend | |
46 | // on 2 variables - light cone energy-momentum fractions: | |
47 | // z1=(E_H + Pz_H)/(E_Q + Pz_Q), z2=(E_H - Pz_H)/(E_Q - Pz_Q). | |
48 | // "soft" & "hard" FFs correspond to "slower" & "faster" quark of a pair | |
b33adf51 | 49 | // (see details in GetHadronPair). Fragmentation does not depend on p-p energy. |
2c890605 | 50 | // 3) Decays the hadrons and saves all the particles in the event stack in the |
51 | // following order: HF hadron from Q, then its decay products, then HF hadron | |
52 | // from Qbar, then its decay productes, then next HF hadon pair (if any) | |
53 | // in the same way, etc... | |
54 | // 4) It is fast, e.g., generates the same number of events with a beauty pair | |
55 | // ~15 times faster than AliGenPythia with kBeautyppMNRwmi (w/o tracking) | |
56 | // | |
b33adf51 | 57 | // An Input file for each quark flavor and p-p energy is in EVGEN/dataCorrHF/ |
2c890605 | 58 | // One can use also user-defined Input files. |
59 | // | |
60 | // More details could be found in my presentation at DiMuonNet Workshop, Dec 2006: | |
b33adf51 | 61 | // http://www-dapnia.cea.fr/Sphn/Alice/DiMuonNet. |
2c890605 | 62 | // |
63 | //------------------------------------------------------------------------- | |
64 | // How to use it: | |
65 | // | |
66 | // add the following typical lines in Config.C | |
67 | /* | |
68 | if (!strcmp(option,"corr")) { | |
9fd56238 | 69 | // An example for correlated charm or beauty hadron pair production at 14 TeV |
2c890605 | 70 | |
b33adf51 | 71 | // AliGenCorrHF *gener = new AliGenCorrHF(1, 4, 14); // for charm, 1 pair per event |
72 | AliGenCorrHF *gener = new AliGenCorrHF(1, 5, 14); // for beauty, 1 pair per event | |
2c890605 | 73 | |
74 | gener->SetMomentumRange(0,9999); | |
9fd56238 | 75 | gener->SetCutOnChild(0); // 1/0 means cuts on children enable/disable |
2c890605 | 76 | gener->SetChildThetaRange(171.0,178.0); |
77 | gener->SetOrigin(0,0,0); //vertex position | |
78 | gener->SetSigma(0,0,0); //Sigma in (X,Y,Z) (cm) on IP position | |
79 | gener->SetForceDecay(kSemiMuonic); | |
80 | gener->SetTrackingFlag(0); | |
81 | gener->Init(); | |
82 | } | |
83 | */ | |
84 | // and in aliroot do e.g. gAlice->Run(10,"Config.C") to produce 10 events. | |
85 | // One can include AliGenCorrHF in an AliGenCocktail generator. | |
86 | //-------------------------------------------------------------------------- | |
87 | ||
7ca4655f | 88 | #include <Riostream.h> |
89 | #include <TCanvas.h> | |
90 | #include <TClonesArray.h> | |
91 | #include <TDatabasePDG.h> | |
2c890605 | 92 | #include <TFile.h> |
2c890605 | 93 | #include <TH2F.h> |
2c890605 | 94 | #include <TLorentzVector.h> |
7ca4655f | 95 | #include <TMath.h> |
2c890605 | 96 | #include <TParticle.h> |
97 | #include <TParticlePDG.h> | |
7ca4655f | 98 | #include <TROOT.h> |
99 | #include <TRandom.h> | |
100 | #include <TTree.h> | |
2c890605 | 101 | #include <TVirtualMC.h> |
b44c3901 | 102 | #include <TVector3.h> |
2c890605 | 103 | |
104 | #include "AliGenCorrHF.h" | |
105 | #include "AliLog.h" | |
106 | #include "AliConst.h" | |
107 | #include "AliDecayer.h" | |
108 | #include "AliMC.h" | |
109 | #include "AliRun.h" | |
84555c93 | 110 | #include "AliGenEventHeader.h" |
2c890605 | 111 | |
112 | ClassImp(AliGenCorrHF) | |
113 | ||
114 | //Begin_Html | |
115 | /* | |
116 | <img src="picts/AliGenCorrHF.gif"> | |
117 | */ | |
118 | //End_Html | |
119 | ||
120 | Double_t AliGenCorrHF::fgdph[19] = {0, 10, 20, 30, 40, 50, 60, 70, 80, 90, 100, 110, 120, 130, 140, 150, 160, 170, 180}; | |
121 | Double_t AliGenCorrHF::fgy[31] = {-10,-7, -6.5, -6, -5.5, -5, -4.5, -4, -3.5, -3, -2.5, -2,- 1.5, -1, -0.5, 0, 0.5, 1, 1.5, 2, 2.5, 3, 3.5, 4, 4.5, 5, 5.5, 6, 6.5, 7, 10}; | |
b33adf51 | 122 | Double_t AliGenCorrHF::fgpt[51] = {0, 0.5, 1, 1.5, 2, 2.5, 3, 3.5, 4, 4.5, 5, 5.5, 6, 6.6, 7.2, 7.8, 8.4, 9, 9.6, 10.3, 11.1, 12, 13, 14, 15, 16, 17, 18, 19, 20.1, 21.5, 23, 24.5, 26, 27.5, 29.1, 31, 33, 35, 37, 39.2, 42, 45, 48, 51, 55.2, 60, 65, 71, 81, 100}; |
2c890605 | 123 | Int_t AliGenCorrHF::fgnptbins = 12; |
124 | Double_t AliGenCorrHF::fgptbmin[12] = {0, 0.5, 1, 1.5, 2, 2.5, 3, 4, 5, 6, 7, 9}; | |
125 | Double_t AliGenCorrHF::fgptbmax[12] = {0.5, 1, 1.5, 2, 2.5, 3, 4, 5, 6, 7, 9, 100}; | |
126 | ||
2c890605 | 127 | //____________________________________________________________ |
128 | AliGenCorrHF::AliGenCorrHF(): | |
129 | fFileName(0), | |
130 | fFile(0), | |
131 | fQuark(0), | |
b33adf51 | 132 | fEnergy(0), |
2c890605 | 133 | fBias(0.), |
134 | fTrials(0), | |
5cc3bcd2 | 135 | fDecayer(0), |
136 | fgIntegral(0) | |
2c890605 | 137 | { |
138 | // Default constructor | |
139 | } | |
140 | ||
141 | //____________________________________________________________ | |
b33adf51 | 142 | AliGenCorrHF::AliGenCorrHF(Int_t npart, Int_t idquark, Int_t energy): |
2c890605 | 143 | AliGenMC(npart), |
144 | fFileName(0), | |
145 | fFile(0), | |
b33adf51 | 146 | fQuark(idquark), |
147 | fEnergy(energy), | |
2c890605 | 148 | fBias(0.), |
149 | fTrials(0), | |
150 | // fDecayer(new AliDecayerPythia()) | |
5cc3bcd2 | 151 | fDecayer(0), |
152 | fgIntegral(0) | |
2c890605 | 153 | { |
b33adf51 | 154 | // Constructor using particle number, quark type, energy & default InputFile |
2c890605 | 155 | // |
b33adf51 | 156 | if (fQuark == 5) { |
9fd56238 | 157 | if (fEnergy == 7) |
158 | fFileName = "$ALICE_ROOT/EVGEN/dataCorrHF/BeautyPP7PythiaMNRwmi.root"; | |
159 | else if (fEnergy == 10) | |
160 | fFileName = "$ALICE_ROOT/EVGEN/dataCorrHF/BeautyPP10PythiaMNRwmi.root"; | |
161 | else if (fEnergy == 14) | |
162 | fFileName = "$ALICE_ROOT/EVGEN/dataCorrHF/BeautyPP14PythiaMNRwmi.root"; | |
163 | else if (fEnergy == 4) | |
164 | fFileName = "$ALICE_ROOT/EVGEN/dataCorrHF/BeautyPbPb394PythiaMNR.root"; | |
165 | else if (fEnergy == 9 || fEnergy == -9) | |
166 | fFileName = "$ALICE_ROOT/EVGEN/dataCorrHF/BeautyPPb88PythiaMNR.root"; | |
167 | else fFileName = "$ALICE_ROOT/EVGEN/dataCorrHF/BeautyPbPb394PythiaMNR.root"; | |
b33adf51 | 168 | } |
169 | else { | |
170 | fQuark = 4; | |
9fd56238 | 171 | if (fEnergy == 7) |
172 | fFileName = "$ALICE_ROOT/EVGEN/dataCorrHF/CharmPP7PythiaMNRwmi.root"; | |
173 | else if (fEnergy == 10) | |
174 | fFileName = "$ALICE_ROOT/EVGEN/dataCorrHF/CharmPP10PythiaMNRwmi.root"; | |
175 | else if (fEnergy == 14) | |
176 | fFileName = "$ALICE_ROOT/EVGEN/dataCorrHF/CharmPP14PythiaMNRwmi.root"; | |
177 | else if (fEnergy == 4) | |
178 | fFileName = "$ALICE_ROOT/EVGEN/dataCorrHF/CharmPbPb394PythiaMNR.root"; | |
179 | else if (fEnergy == 9 || fEnergy == -9) | |
180 | fFileName = "$ALICE_ROOT/EVGEN/dataCorrHF/CharmPPb88PythiaMNR.root"; | |
181 | else fFileName = "$ALICE_ROOT/EVGEN/dataCorrHF/CharmPbPb394PythiaMNR.root"; | |
b33adf51 | 182 | } |
2c890605 | 183 | fName = "Default"; |
184 | fTitle= "Generator for correlated pairs of HF hadrons"; | |
185 | ||
186 | fChildSelect.Set(5); | |
187 | for (Int_t i=0; i<5; i++) fChildSelect[i]=0; | |
188 | SetForceDecay(); | |
189 | SetCutOnChild(); | |
190 | SetChildMomentumRange(); | |
191 | SetChildPtRange(); | |
192 | SetChildPhiRange(); | |
193 | SetChildThetaRange(); | |
194 | } | |
195 | ||
196 | //___________________________________________________________________ | |
b33adf51 | 197 | AliGenCorrHF::AliGenCorrHF(char* tname, Int_t npart, Int_t idquark, Int_t energy): |
2c890605 | 198 | AliGenMC(npart), |
199 | fFileName(tname), | |
200 | fFile(0), | |
b33adf51 | 201 | fQuark(idquark), |
202 | fEnergy(energy), | |
2c890605 | 203 | fBias(0.), |
204 | fTrials(0), | |
205 | // fDecayer(new AliDecayerPythia()) | |
5cc3bcd2 | 206 | fDecayer(0), |
207 | fgIntegral(0) | |
2c890605 | 208 | { |
b33adf51 | 209 | // Constructor using particle number, quark type, energy & user-defined InputFile |
2c890605 | 210 | // |
211 | if (fQuark != 5) fQuark = 4; | |
212 | fName = "UserDefined"; | |
213 | fTitle= "Generator for correlated pairs of HF hadrons"; | |
214 | ||
215 | fChildSelect.Set(5); | |
216 | for (Int_t i=0; i<5; i++) fChildSelect[i]=0; | |
217 | SetForceDecay(); | |
218 | SetCutOnChild(); | |
219 | SetChildMomentumRange(); | |
220 | SetChildPtRange(); | |
221 | SetChildPhiRange(); | |
222 | SetChildThetaRange(); | |
223 | } | |
224 | ||
2c890605 | 225 | //____________________________________________________________ |
226 | AliGenCorrHF::~AliGenCorrHF() | |
227 | { | |
228 | // Destructor | |
229 | delete fFile; | |
230 | } | |
231 | ||
232 | //____________________________________________________________ | |
233 | void AliGenCorrHF::Init() | |
234 | { | |
235 | // Initialisation | |
236 | ||
237 | AliInfo(Form(" QQbar kinematics and fragm. functions from: %s",fFileName.Data() )); | |
238 | fFile = TFile::Open(fFileName.Data()); | |
239 | if(!fFile->IsOpen()){ | |
240 | AliError(Form("Could not open file %s",fFileName.Data() )); | |
241 | } | |
242 | ||
243 | ComputeIntegral(fFile); | |
b44c3901 | 244 | |
2c890605 | 245 | fParentWeight = 1./fNpart; // fNpart is number of HF-hadron pairs |
246 | ||
247 | // particle decay related initialization | |
248 | ||
249 | if (gMC) fDecayer = gMC->GetDecayer(); | |
250 | fDecayer->SetForceDecay(fForceDecay); | |
251 | fDecayer->Init(); | |
252 | ||
253 | // | |
254 | AliGenMC::Init(); | |
255 | } | |
2c890605 | 256 | //____________________________________________________________ |
257 | void AliGenCorrHF::Generate() | |
258 | { | |
259 | // | |
cb11fd27 | 260 | // Generate fNpart of correlated HF hadron pairs per event |
261 | // in the the desired theta and momentum windows (phi = 0 - 2pi). | |
84555c93 | 262 | // |
cb11fd27 | 263 | |
84555c93 | 264 | // Reinitialize decayer |
2c890605 | 265 | |
84555c93 | 266 | fDecayer->SetForceDecay(fForceDecay); |
267 | fDecayer->Init(); | |
268 | ||
269 | // | |
2c890605 | 270 | Float_t polar[3]= {0,0,0}; // Polarisation of the parent particle (for GEANT tracking) |
271 | Float_t origin0[3]; // Origin of the generated parent particle (for GEANT tracking) | |
272 | Float_t pt, pl, ptot; // Transverse, logitudinal and total momenta of the parent particle | |
273 | Float_t phi, theta; // Phi and theta spherical angles of the parent particle momentum | |
274 | Float_t p[3], pc[3], och[3];// Momentum, polarisation and origin of the children particles from lujet | |
84555c93 | 275 | Int_t nt, i, j, ipa, ihadron[2], iquark[2]; |
276 | Float_t wgtp, wgtch, random[6]; | |
277 | Float_t pq[2][3]; // Momenta of the two quarks | |
278 | Int_t ntq[2] = {-1, -1}; | |
cb11fd27 | 279 | Double_t tanhy2, qm = 0; |
2c890605 | 280 | |
b44c3901 | 281 | Double_t dphi=0, ptq[2], yq[2], pth[2], plh[2], ph[2], phih[2], phiq[2]; |
2c890605 | 282 | for (i=0; i<2; i++) { |
b44c3901 | 283 | ptq[i] =0; |
284 | yq[i] =0; | |
285 | pth[i] =0; | |
286 | plh[i] =0; | |
287 | phih[i] =0; | |
288 | phiq[i] =0; | |
2c890605 | 289 | ihadron[i] =0; |
84555c93 | 290 | iquark[i] =0; |
2c890605 | 291 | } |
292 | ||
cb11fd27 | 293 | // same quarks mass as in the fragmentation functions |
294 | if (fQuark == 4) qm = 1.20; | |
295 | else qm = 4.75; | |
296 | ||
5cc3bcd2 | 297 | TClonesArray *particles = new TClonesArray("TParticle",1000); |
2c890605 | 298 | |
84555c93 | 299 | TDatabasePDG *pDataBase = TDatabasePDG::Instance(); |
300 | // | |
301 | ||
302 | // Calculating vertex position per event | |
2c890605 | 303 | for (j=0;j<3;j++) origin0[j]=fOrigin[j]; |
b33adf51 | 304 | if (fVertexSmear==kPerEvent) { |
84555c93 | 305 | Vertex(); |
306 | for (j=0;j<3;j++) origin0[j]=fVertex[j]; | |
2c890605 | 307 | } |
308 | ||
84555c93 | 309 | ipa=0; |
310 | ||
9fd56238 | 311 | // Generating fNpart HF-hadron pairs |
84555c93 | 312 | fNprimaries = 0; |
313 | ||
314 | while (ipa<2*fNpart) { | |
315 | ||
316 | GetQuarkPair(fFile, fgIntegral, yq[0], yq[1], ptq[0], ptq[1], dphi); | |
317 | ||
318 | GetHadronPair(fFile, fQuark, yq[0], yq[1], ptq[0], ptq[1], ihadron[0], ihadron[1], plh[0], plh[1], pth[0], pth[1]); | |
319 | ||
9fd56238 | 320 | if (fEnergy == 9 || fEnergy == -9) { // boost particles from c.m.s. to ALICE lab frame |
321 | Double_t dyBoost = 0.47; | |
322 | Double_t beta = TMath::TanH(dyBoost); | |
323 | Double_t gamma = 1./TMath::Sqrt((1.-beta)*(1.+beta)); | |
324 | Double_t gb = gamma * beta; | |
325 | yq[0] += dyBoost; | |
326 | yq[1] += dyBoost; | |
327 | plh[0] = gb * TMath::Sqrt(plh[0]*plh[0] + pth[0]*pth[0]) + gamma * plh[0]; | |
328 | plh[1] = gb * TMath::Sqrt(plh[1]*plh[1] + pth[1]*pth[1]) + gamma * plh[1]; | |
329 | if (fEnergy == 9) { | |
330 | yq[0] *= -1; | |
331 | yq[1] *= -1; | |
332 | plh[0] *= -1; | |
333 | plh[1] *= -1; | |
334 | } | |
335 | } | |
336 | ||
84555c93 | 337 | // Cuts from AliGenerator |
338 | ||
339 | // Cut on theta | |
340 | theta=TMath::ATan2(pth[0],plh[0]); | |
b33adf51 | 341 | if (theta<fThetaMin || theta>fThetaMax) continue; |
84555c93 | 342 | theta=TMath::ATan2(pth[1],plh[1]); |
b33adf51 | 343 | if (theta<fThetaMin || theta>fThetaMax) continue; |
84555c93 | 344 | |
345 | // Cut on momentum | |
346 | ph[0]=TMath::Sqrt(pth[0]*pth[0]+plh[0]*plh[0]); | |
347 | if (ph[0]<fPMin || ph[0]>fPMax) continue; | |
348 | ph[1]=TMath::Sqrt(pth[1]*pth[1]+plh[1]*plh[1]); | |
349 | if (ph[1]<fPMin || ph[1]>fPMax) continue; | |
350 | ||
351 | // Add the quarks in the stack | |
352 | ||
353 | phiq[0] = Rndm()*k2PI; | |
354 | if (Rndm() < 0.5) { | |
b44c3901 | 355 | phiq[1] = phiq[0] + dphi*kDegrad; |
84555c93 | 356 | } else { |
357 | phiq[1] = phiq[0] - dphi*kDegrad; | |
358 | } | |
359 | if (phiq[1] > k2PI) phiq[1] -= k2PI; | |
360 | if (phiq[1] < 0 ) phiq[1] += k2PI; | |
361 | ||
362 | // quarks pdg | |
363 | iquark[0] = +fQuark; | |
364 | iquark[1] = -fQuark; | |
365 | ||
366 | // px and py | |
367 | TVector2 qvect1 = TVector2(); | |
368 | TVector2 qvect2 = TVector2(); | |
369 | qvect1.SetMagPhi(ptq[0],phiq[0]); | |
370 | qvect2.SetMagPhi(ptq[1],phiq[1]); | |
371 | pq[0][0] = qvect1.Px(); | |
372 | pq[0][1] = qvect1.Py(); | |
373 | pq[1][0] = qvect2.Px(); | |
374 | pq[1][1] = qvect2.Py(); | |
375 | ||
376 | // pz | |
cb11fd27 | 377 | tanhy2 = TMath::TanH(yq[0]); |
378 | tanhy2 *= tanhy2; | |
379 | pq[0][2] = TMath::Sqrt((ptq[0]*ptq[0]+qm*qm)*tanhy2/(1-tanhy2)); | |
380 | pq[0][2] = TMath::Sign((Double_t)pq[0][2],yq[0]); | |
381 | tanhy2 = TMath::TanH(yq[1]); | |
382 | tanhy2 *= tanhy2; | |
383 | pq[1][2] = TMath::Sqrt((ptq[1]*ptq[1]+qm*qm)*tanhy2/(1-tanhy2)); | |
384 | pq[1][2] = TMath::Sign((Double_t)pq[1][2],yq[1]); | |
84555c93 | 385 | |
386 | // Here we assume that |phi_H1 - phi_H2| = |phi_Q1 - phi_Q2| = dphi | |
387 | // which is a good approximation for heavy flavors in Pythia | |
388 | // ... moreover, same phi angles as for the quarks ... | |
389 | ||
390 | phih[0] = phiq[0]; | |
391 | phih[1] = phiq[1]; | |
b44c3901 | 392 | |
84555c93 | 393 | for (Int_t ihad = 0; ihad < 2; ihad++) { |
394 | while(1) { | |
395 | // | |
396 | // particle type | |
397 | Int_t iPart = ihadron[ihad]; | |
398 | fChildWeight=(fDecayer->GetPartialBranchingRatio(iPart))*fParentWeight; | |
399 | wgtp=fParentWeight; | |
400 | wgtch=fChildWeight; | |
401 | TParticlePDG *particle = pDataBase->GetParticle(iPart); | |
402 | Float_t am = particle->Mass(); | |
403 | phi = phih[ihad]; | |
404 | pt = pth[ihad]; | |
405 | pl = plh[ihad]; | |
406 | ptot=TMath::Sqrt(pt*pt+pl*pl); | |
407 | ||
408 | p[0]=pt*TMath::Cos(phi); | |
409 | p[1]=pt*TMath::Sin(phi); | |
410 | p[2]=pl; | |
b44c3901 | 411 | |
2c890605 | 412 | if(fVertexSmear==kPerTrack) { |
84555c93 | 413 | Rndm(random,6); |
414 | for (j=0;j<3;j++) { | |
415 | origin0[j]= | |
416 | fOrigin[j]+fOsigma[j]*TMath::Cos(2*random[2*j]*TMath::Pi())* | |
417 | TMath::Sqrt(-2*TMath::Log(random[2*j+1])); | |
2c890605 | 418 | } |
419 | } | |
84555c93 | 420 | |
421 | // Looking at fForceDecay : | |
422 | // if fForceDecay != none Primary particle decays using | |
423 | // AliPythia and children are tracked by GEANT | |
424 | // | |
425 | // if fForceDecay == none Primary particle is tracked by GEANT | |
426 | // (In the latest, make sure that GEANT actually does all the decays you want) | |
427 | // | |
428 | ||
429 | if (fForceDecay != kNoDecay) { | |
430 | // Using lujet to decay particle | |
431 | Float_t energy=TMath::Sqrt(ptot*ptot+am*am); | |
432 | TLorentzVector pmom(p[0], p[1], p[2], energy); | |
433 | fDecayer->Decay(iPart,&pmom); | |
434 | // | |
435 | // select decay particles | |
436 | Int_t np=fDecayer->ImportParticles(particles); | |
437 | ||
438 | // Selecting GeometryAcceptance for particles fPdgCodeParticleforAcceptanceCut; | |
439 | if (fGeometryAcceptance) | |
440 | if (!CheckAcceptanceGeometry(np,particles)) continue; | |
441 | Int_t ncsel=0; | |
442 | Int_t* pFlag = new Int_t[np]; | |
443 | Int_t* pParent = new Int_t[np]; | |
444 | Int_t* pSelected = new Int_t[np]; | |
445 | Int_t* trackIt = new Int_t[np]; | |
446 | ||
447 | for (i=0; i<np; i++) { | |
448 | pFlag[i] = 0; | |
449 | pSelected[i] = 0; | |
450 | pParent[i] = -1; | |
451 | } | |
452 | ||
453 | if (np >1) { | |
454 | TParticle* iparticle = (TParticle *) particles->At(0); | |
455 | Int_t ipF, ipL; | |
456 | for (i = 1; i<np ; i++) { | |
457 | trackIt[i] = 1; | |
458 | iparticle = (TParticle *) particles->At(i); | |
459 | Int_t kf = iparticle->GetPdgCode(); | |
460 | Int_t ks = iparticle->GetStatusCode(); | |
461 | // flagged particle | |
462 | ||
463 | if (pFlag[i] == 1) { | |
464 | ipF = iparticle->GetFirstDaughter(); | |
465 | ipL = iparticle->GetLastDaughter(); | |
466 | if (ipF > 0) for (j=ipF-1; j<ipL; j++) pFlag[j]=1; | |
467 | continue; | |
468 | } | |
469 | ||
470 | // flag decay products of particles with long life-time (c tau > .3 mum) | |
471 | ||
472 | if (ks != 1) { | |
473 | //TParticlePDG *particle = pDataBase->GetParticle(kf); | |
474 | ||
475 | Double_t lifeTime = fDecayer->GetLifetime(kf); | |
476 | //Double_t mass = particle->Mass(); | |
477 | //Double_t width = particle->Width(); | |
478 | if (lifeTime > (Double_t) fMaxLifeTime) { | |
479 | ipF = iparticle->GetFirstDaughter(); | |
480 | ipL = iparticle->GetLastDaughter(); | |
481 | if (ipF > 0) for (j=ipF-1; j<ipL; j++) pFlag[j]=1; | |
b33adf51 | 482 | } else { |
84555c93 | 483 | trackIt[i] = 0; |
484 | pSelected[i] = 1; | |
2c890605 | 485 | } |
84555c93 | 486 | } // ks==1 ? |
487 | // | |
488 | // children | |
489 | ||
f7b22746 | 490 | if ((ChildSelected(TMath::Abs(kf)) || fForceDecay == kAll) && trackIt[i]) |
84555c93 | 491 | { |
492 | if (fCutOnChild) { | |
493 | pc[0]=iparticle->Px(); | |
494 | pc[1]=iparticle->Py(); | |
495 | pc[2]=iparticle->Pz(); | |
496 | Bool_t childok = KinematicSelection(iparticle, 1); | |
497 | if(childok) { | |
498 | pSelected[i] = 1; | |
499 | ncsel++; | |
500 | } else { | |
501 | ncsel=-1; | |
502 | break; | |
503 | } // child kine cuts | |
504 | } else { | |
505 | pSelected[i] = 1; | |
506 | ncsel++; | |
507 | } // if child selection | |
508 | } // select muon | |
509 | } // decay particle loop | |
510 | } // if decay products | |
511 | ||
512 | Int_t iparent; | |
513 | if ((fCutOnChild && ncsel >0) || !fCutOnChild){ | |
514 | ipa++; | |
515 | // | |
516 | // Parent | |
517 | // quark | |
518 | PushTrack(0, -1, iquark[ihad], pq[ihad], origin0, polar, 0, kPPrimary, nt, wgtp); | |
519 | KeepTrack(nt); | |
520 | ntq[ihad] = nt; | |
84555c93 | 521 | // hadron |
522 | PushTrack(0, ntq[ihad], iPart, p, origin0, polar, 0, kPDecay, nt, wgtp); | |
523 | pParent[0] = nt; | |
524 | KeepTrack(nt); | |
525 | fNprimaries++; | |
84555c93 | 526 | |
527 | // | |
528 | // Decay Products | |
529 | // | |
530 | for (i = 1; i < np; i++) { | |
531 | if (pSelected[i]) { | |
532 | TParticle* iparticle = (TParticle *) particles->At(i); | |
533 | Int_t kf = iparticle->GetPdgCode(); | |
7f11c778 | 534 | Int_t jpa = iparticle->GetFirstMother()-1; |
2c890605 | 535 | |
84555c93 | 536 | och[0] = origin0[0]+iparticle->Vx()/10; |
537 | och[1] = origin0[1]+iparticle->Vy()/10; | |
538 | och[2] = origin0[2]+iparticle->Vz()/10; | |
539 | pc[0] = iparticle->Px(); | |
540 | pc[1] = iparticle->Py(); | |
541 | pc[2] = iparticle->Pz(); | |
2c890605 | 542 | |
7f11c778 | 543 | if (jpa > -1) { |
544 | iparent = pParent[jpa]; | |
84555c93 | 545 | } else { |
546 | iparent = -1; | |
547 | } | |
548 | ||
549 | PushTrack(fTrackIt*trackIt[i], iparent, kf, | |
550 | pc, och, polar, | |
551 | 0, kPDecay, nt, wgtch); | |
84555c93 | 552 | pParent[i] = nt; |
553 | KeepTrack(nt); | |
554 | fNprimaries++; | |
555 | } // Selected | |
556 | } // Particle loop | |
557 | } // Decays by Lujet | |
558 | particles->Clear(); | |
559 | if (pFlag) delete[] pFlag; | |
560 | if (pParent) delete[] pParent; | |
561 | if (pSelected) delete[] pSelected; | |
562 | if (trackIt) delete[] trackIt; | |
563 | } // kinematic selection | |
564 | else // nodecay option, so parent will be tracked by GEANT (pions, kaons, eta, omegas, baryons) | |
565 | { | |
566 | gAlice->GetMCApp()-> | |
567 | PushTrack(fTrackIt,-1,iPart,p,origin0,polar,0,kPPrimary,nt,wgtp); | |
568 | ipa++; | |
569 | fNprimaries++; | |
570 | } | |
2c890605 | 571 | break; |
9fd56238 | 572 | } // while(1) loop |
84555c93 | 573 | } // hadron pair loop |
9fd56238 | 574 | } // while (ipa<2*fNpart) loop |
575 | ||
2c890605 | 576 | SetHighWaterMark(nt); |
84555c93 | 577 | |
cb11fd27 | 578 | AliGenEventHeader* header = new AliGenEventHeader("CorrHF"); |
84555c93 | 579 | header->SetPrimaryVertex(fVertex); |
580 | header->SetNProduced(fNprimaries); | |
581 | AddHeader(header); | |
2c890605 | 582 | |
5cc3bcd2 | 583 | delete particles; |
584 | ||
84555c93 | 585 | } |
2c890605 | 586 | //____________________________________________________________________________________ |
9fd56238 | 587 | void AliGenCorrHF::IpCharm(TH2F *hProbHH, Int_t &pdg3, Int_t &pdg4) |
2c890605 | 588 | { |
9fd56238 | 589 | // Composition of a lower state charm hadron pair from a ccbar quark pair |
590 | Int_t pdgH[] = {411, 421, 431, 4122, 4132, 4232, 4332}; | |
591 | ||
592 | Double_t id3, id4; | |
593 | hProbHH->GetRandom2(id3, id4); | |
594 | pdg3 = pdgH[(Int_t)TMath::Floor(id3)]; | |
595 | pdg4 = -1*pdgH[(Int_t)TMath::Floor(id4)]; | |
596 | ||
597 | return; | |
2c890605 | 598 | } |
599 | ||
9fd56238 | 600 | void AliGenCorrHF::IpBeauty(TH2F *hProbHH, Int_t &pdg3, Int_t &pdg4) |
2c890605 | 601 | { |
9fd56238 | 602 | // Composition of a lower state beauty hadron pair from a bbbar quark pair |
603 | // B-Bbar mixing will be done by Pythia at their decay point | |
604 | Int_t pdgH[] = {511, 521, 531, 5122, 5132, 5232, 5332}; | |
605 | ||
606 | Double_t id3, id4; | |
607 | hProbHH->GetRandom2(id3, id4); | |
608 | pdg3 = pdgH[(Int_t)TMath::Floor(id3)]; | |
609 | pdg4 = -1*pdgH[(Int_t)TMath::Floor(id4)]; | |
610 | ||
611 | if ( (pdg3== 511) || (pdg3== 521) || (pdg3== 531) ) pdg3 *= -1; | |
612 | if ( (pdg4==-511) || (pdg4==-521) || (pdg4==-531) ) pdg4 *= -1; | |
613 | ||
614 | return; | |
2c890605 | 615 | } |
616 | ||
617 | //____________________________________________________________________________________ | |
618 | Double_t AliGenCorrHF::ComputeIntegral(TFile* fG) // needed by GetQuarkPair | |
619 | { | |
620 | // Read QQbar kinematical 5D grid's cell occupancy weights | |
4c111067 | 621 | Int_t cell[6]; // cell[6]={wght,iy1,iy2,ipt1,ipt2,idph} |
2c890605 | 622 | TTree* tG = (TTree*) fG->Get("tGqq"); |
4c111067 | 623 | tG->GetBranch("cell")->SetAddress(&cell); |
2c890605 | 624 | Int_t nbins = tG->GetEntries(); |
625 | ||
626 | // delete previously computed integral (if any) | |
627 | if(fgIntegral) delete [] fgIntegral; | |
628 | ||
629 | fgIntegral = new Double_t[nbins+1]; | |
630 | fgIntegral[0] = 0; | |
631 | Int_t bin; | |
632 | for(bin=0;bin<nbins;bin++) { | |
633 | tG->GetEvent(bin); | |
634 | fgIntegral[bin+1] = fgIntegral[bin] + cell[0]; | |
635 | } | |
636 | // Normalize integral to 1 | |
637 | if (fgIntegral[nbins] == 0 ) { | |
638 | return 0; | |
639 | } | |
640 | for (bin=1;bin<=nbins;bin++) fgIntegral[bin] /= fgIntegral[nbins]; | |
641 | ||
642 | return fgIntegral[nbins]; | |
643 | } | |
644 | ||
645 | //____________________________________________________________________________________ | |
646 | void AliGenCorrHF::GetQuarkPair(TFile* fG, Double_t* fInt, Double_t &y1, Double_t &y2, Double_t &pt1, Double_t &pt2, Double_t &dphi) | |
647 | // modification of ROOT's TH3::GetRandom3 for 5D | |
648 | { | |
649 | // Read QQbar kinematical 5D grid's cell coordinates | |
4c111067 | 650 | Int_t cell[6]; // cell[6]={wght,iy1,iy2,ipt1,ipt2,idph} |
2c890605 | 651 | TTree* tG = (TTree*) fG->Get("tGqq"); |
4c111067 | 652 | tG->GetBranch("cell")->SetAddress(&cell); |
2c890605 | 653 | Int_t nbins = tG->GetEntries(); |
654 | Double_t rand[6]; | |
655 | gRandom->RndmArray(6,rand); | |
656 | Int_t ibin = TMath::BinarySearch(nbins,fInt,rand[0]); | |
657 | tG->GetEvent(ibin); | |
658 | y1 = fgy[cell[1]] + (fgy[cell[1]+1]-fgy[cell[1]])*rand[1]; | |
659 | y2 = fgy[cell[2]] + (fgy[cell[2]+1]-fgy[cell[2]])*rand[2]; | |
660 | pt1 = fgpt[cell[3]] + (fgpt[cell[3]+1]-fgpt[cell[3]])*rand[3]; | |
661 | pt2 = fgpt[cell[4]] + (fgpt[cell[4]+1]-fgpt[cell[4]])*rand[4]; | |
662 | dphi = fgdph[cell[5]]+ (fgdph[cell[5]+1]-fgdph[cell[5]])*rand[5]; | |
663 | } | |
664 | ||
665 | //____________________________________________________________________________________ | |
666 | void AliGenCorrHF::GetHadronPair(TFile* fG, Int_t idq, Double_t y1, Double_t y2, Double_t pt1, Double_t pt2, Int_t &id3, Int_t &id4, Double_t &pz3, Double_t &pz4, Double_t &pt3, Double_t &pt4) | |
667 | { | |
668 | // Generate a hadron pair | |
9fd56238 | 669 | void (*fIpParaFunc)(TH2F *, Int_t &, Int_t &);//Pointer to hadron pair composition function |
2c890605 | 670 | fIpParaFunc = IpCharm; |
671 | Double_t mq = 1.2; // c & b quark masses (used in AliPythia) | |
672 | if (idq == 5) { | |
673 | fIpParaFunc = IpBeauty; | |
674 | mq = 4.75; | |
675 | } | |
676 | Double_t z11, z12, z21, z22, pz1, pz2, e1, e2, mh, ptemp, rand[2]; | |
677 | char tag[100]; | |
9fd56238 | 678 | TH2F *h2h[12], *h2s[12], *hProbHH; // hard & soft fragmentation and HH-probability functions |
2c890605 | 679 | for (Int_t ipt = 0; ipt<fgnptbins; ipt++) { |
680 | sprintf(tag,"h2h_pt%d",ipt); | |
681 | h2h[ipt] = (TH2F*) fG->Get(tag); | |
682 | sprintf(tag,"h2s_pt%d",ipt); | |
683 | h2s[ipt] = (TH2F*) fG->Get(tag); | |
684 | } | |
685 | ||
686 | if (y1*y2 < 0) { | |
687 | for (Int_t ipt = 0; ipt<fgnptbins; ipt++) { | |
688 | if(pt1 >= fgptbmin[ipt] && pt1 < fgptbmax[ipt]) | |
689 | h2h[ipt]->GetRandom2(z11, z21); | |
690 | if(pt2 >= fgptbmin[ipt] && pt2 < fgptbmax[ipt]) | |
691 | h2h[ipt]->GetRandom2(z12, z22); | |
692 | } | |
693 | } | |
694 | else { | |
695 | if (TMath::Abs(y1) > TMath::Abs(y2)) { | |
696 | for (Int_t ipt = 0; ipt<fgnptbins; ipt++) { | |
697 | if(pt1 >= fgptbmin[ipt] && pt1 < fgptbmax[ipt]) | |
698 | h2h[ipt]->GetRandom2(z11, z21); | |
699 | if(pt2 >= fgptbmin[ipt] && pt2 < fgptbmax[ipt]) | |
700 | h2s[ipt]->GetRandom2(z12, z22); | |
701 | } | |
702 | } | |
703 | else { | |
704 | for (Int_t ipt = 0; ipt<fgnptbins; ipt++) { | |
705 | if(pt1 >= fgptbmin[ipt] && pt1 < fgptbmax[ipt]) | |
706 | h2s[ipt]->GetRandom2(z11, z21); | |
707 | if(pt2 >= fgptbmin[ipt] && pt2 < fgptbmax[ipt]) | |
708 | h2h[ipt]->GetRandom2(z12, z22); | |
709 | } | |
710 | } | |
711 | } | |
712 | gRandom->RndmArray(2,rand); | |
713 | ptemp = TMath::Sqrt(pt1*pt1 + mq*mq); | |
714 | pz1 = ptemp*TMath::SinH(y1); | |
715 | e1 = ptemp*TMath::CosH(y1); | |
716 | ptemp = TMath::Sqrt(pt2*pt2 + mq*mq); | |
717 | pz2 = ptemp*TMath::SinH(y2); | |
718 | e2 = ptemp*TMath::CosH(y2); | |
719 | ||
9fd56238 | 720 | hProbHH = (TH2F*)fG->Get("hProbHH"); |
721 | fIpParaFunc(hProbHH, id3, id4); | |
2c890605 | 722 | mh = TDatabasePDG::Instance()->GetParticle(id3)->Mass(); |
723 | ptemp = z11*z21*(e1*e1-pz1*pz1) - mh*mh; | |
b33adf51 | 724 | if (idq==5) pt3 = pt1; // an approximation at low pt, try better |
9fd56238 | 725 | else pt3 = rand[0]; // pt3=pt1 gives less D-hadrons at low pt |
2c890605 | 726 | if (ptemp > 0) pt3 = TMath::Sqrt(ptemp); |
727 | if (pz1 > 0) pz3 = (z11*(e1 + pz1) - z21*(e1 - pz1)) / 2; | |
728 | else pz3 = (z21*(e1 + pz1) - z11*(e1 - pz1)) / 2; | |
729 | e1 = TMath::Sqrt(pz3*pz3 + pt3*pt3 + mh*mh); | |
730 | ||
2c890605 | 731 | mh = TDatabasePDG::Instance()->GetParticle(id4)->Mass(); |
732 | ptemp = z12*z22*(e2*e2-pz2*pz2) - mh*mh; | |
b33adf51 | 733 | if (idq==5) pt4 = pt2; // an approximation at low pt, try better |
734 | else pt4 = rand[1]; | |
2c890605 | 735 | if (ptemp > 0) pt4 = TMath::Sqrt(ptemp); |
736 | if (pz2 > 0) pz4 = (z12*(e2 + pz2) - z22*(e2 - pz2)) / 2; | |
737 | else pz4 = (z22*(e2 + pz2) - z12*(e2 - pz2)) / 2; | |
738 | e2 = TMath::Sqrt(pz4*pz4 + pt4*pt4 + mh*mh); | |
739 | ||
740 | // small corr. instead of using Frag. Func. depending on yQ (in addition to ptQ) | |
741 | Float_t ycorr = 0.2, y3, y4; | |
742 | gRandom->RndmArray(2,rand); | |
743 | y3 = 0.5 * TMath::Log((e1 + pz3 + 1.e-13)/(e1 - pz3 + 1.e-13)); | |
744 | y4 = 0.5 * TMath::Log((e2 + pz4 + 1.e-13)/(e2 - pz4 + 1.e-13)); | |
745 | if(TMath::Abs(y3)<ycorr && TMath::Abs(y4)<ycorr && rand[0]>0.5) { | |
bfd20868 | 746 | ptemp = TMath::Sqrt((e1-pz3)*(e1+pz3)); |
2c890605 | 747 | y3 = 4*(1 - 2*rand[1]); |
748 | pz3 = ptemp*TMath::SinH(y3); | |
749 | pz4 = pz3; | |
750 | } | |
751 | } | |
5cc3bcd2 | 752 |