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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 | |
23 | // ~2.10^6 Pythia6.214 events generated with kCharmppMNRwmi & kBeautyppMNRwmi, | |
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. | |
27 | // Decays are performed by Pythia. | |
28 | // Author: S. Grigoryan, LPC Clermont-Fd & YerPhI, Smbat.Grigoryan@cern.ch | |
29 | // July 07: added quarks in the stack (B. Vulpescu) | |
30 | // April 09: added energy choice between 10 and 14 TeV (S. Grigoryan) | |
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) | |
34 | // April 10: removed "static" from definition of some variables (B. Vulpescu) | |
35 | // May 11: added Flag for transportation of background particles while using | |
36 | // SetForceDecay() function (L. Manceau) | |
37 | // June 11: added modifications allowing the setting of cuts on HF-hadron children. | |
38 | // Quarks, hadrons and decay particles are loaded in the stack outside the loop | |
39 | // of HF-hadrons, when the cuts on their children are satisfied (L. Manceau) | |
40 | // Oct 11: added Pb-Pb at 2.76 TeV (S. Grigoryan) | |
41 | // | |
42 | //------------------------------------------------------------------------- | |
43 | // How it works (for the given flavor and p-p energy): | |
44 | // | |
45 | // 1) Reads QQbar kinematical grid (TTree) from the Input file and generates | |
46 | // quark pairs according to the weights of the cells. | |
47 | // It is a 5D grid in y1,y2,pt1,pt2 and deltaphi, with occupancy weights | |
48 | // of the cells obtained from Pythia (see details in GetQuarkPair). | |
49 | // 2) Reads "soft" and "hard" fragmentation functions (12 2D-histograms each, | |
50 | // for 12 pt bins) from the Input file, applies to quarks and produces hadrons | |
51 | // (only lower states, with proportions of species obtained from Pythia). | |
52 | // Fragmentation functions are the same for all hadron species and depend | |
53 | // on 2 variables - light cone energy-momentum fractions: | |
54 | // z1=(E_H + Pz_H)/(E_Q + Pz_Q), z2=(E_H - Pz_H)/(E_Q - Pz_Q). | |
55 | // "soft" & "hard" FFs correspond to "slower" & "faster" quark of a pair | |
56 | // (see details in GetHadronPair). Fragmentation does not depend on p-p energy. | |
57 | // 3) Decays the hadrons and saves all the particles in the event stack in the | |
58 | // following order: HF hadron from Q, then its decay products, then HF hadron | |
59 | // from Qbar, then its decay productes, then next HF hadon pair (if any) | |
60 | // in the same way, etc... | |
61 | // 4) It is fast, e.g., generates the same number of events with a beauty pair | |
62 | // ~15 times faster than AliGenPythia with kBeautyppMNRwmi (w/o tracking) | |
63 | // | |
64 | // An Input file for each quark flavor and p-p energy is in EVGEN/dataCorrHF/ | |
65 | // One can use also user-defined Input files. | |
66 | // | |
67 | // More details could be found in my presentation at DiMuonNet Workshop, Dec 2006: | |
68 | // http://www-dapnia.cea.fr/Sphn/Alice/DiMuonNet. | |
69 | // | |
70 | //------------------------------------------------------------------------- | |
71 | // How to use it: | |
72 | // | |
73 | // add the following typical lines in Config.C | |
74 | /* | |
75 | if (!strcmp(option,"corr")) { | |
76 | // An example for correlated charm or beauty hadron pair production at 14 TeV | |
77 | ||
78 | // AliGenCorrHF *gener = new AliGenCorrHF(1, 4, 14); // for charm, 1 pair per event | |
79 | AliGenCorrHF *gener = new AliGenCorrHF(1, 5, 14); // for beauty, 1 pair per event | |
80 | ||
81 | gener->SetMomentumRange(0,9999); | |
82 | gener->SetCutOnChild(0); // 1/0 means cuts on children enable/disable | |
83 | gener->SetChildThetaRange(171.0,178.0); | |
84 | gener->SetOrigin(0,0,0); //vertex position | |
85 | gener->SetSigma(0,0,0); //Sigma in (X,Y,Z) (cm) on IP position | |
86 | gener->SetForceDecay(kSemiMuonic); | |
87 | gener->SetTrackingFlag(0); | |
88 | gener->Init(); | |
89 | } | |
90 | */ | |
91 | // and in aliroot do e.g. gAlice->Run(10,"Config.C") to produce 10 events. | |
92 | // One can include AliGenCorrHF in an AliGenCocktail generator. | |
93 | //-------------------------------------------------------------------------- | |
94 | ||
95 | #include <Riostream.h> | |
96 | #include <TCanvas.h> | |
97 | #include <TClonesArray.h> | |
98 | #include <TDatabasePDG.h> | |
99 | #include <TFile.h> | |
100 | #include <TH2F.h> | |
101 | #include <TLorentzVector.h> | |
102 | #include <TMath.h> | |
103 | #include <TParticle.h> | |
104 | #include <TParticlePDG.h> | |
105 | #include <TROOT.h> | |
106 | #include <TRandom.h> | |
107 | #include <TTree.h> | |
108 | #include <TVirtualMC.h> | |
109 | #include <TVector3.h> | |
110 | ||
111 | #include "AliGenCorrHF.h" | |
112 | #include "AliLog.h" | |
113 | #include "AliConst.h" | |
114 | #include "AliDecayer.h" | |
115 | #include "AliMC.h" | |
116 | #include "AliRun.h" | |
117 | #include "AliGenEventHeader.h" | |
118 | ||
119 | ClassImp(AliGenCorrHF) | |
120 | ||
121 | //Begin_Html | |
122 | /* | |
123 | <img src="picts/AliGenCorrHF.gif"> | |
124 | */ | |
125 | //End_Html | |
126 | ||
127 | Double_t AliGenCorrHF::fgdph[19] = {0, 10, 20, 30, 40, 50, 60, 70, 80, 90, 100, 110, 120, 130, 140, 150, 160, 170, 180}; | |
128 | 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}; | |
129 | 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}; | |
130 | Int_t AliGenCorrHF::fgnptbins = 12; | |
131 | Double_t AliGenCorrHF::fgptbmin[12] = {0, 0.5, 1, 1.5, 2, 2.5, 3, 4, 5, 6, 7, 9}; | |
132 | Double_t AliGenCorrHF::fgptbmax[12] = {0.5, 1, 1.5, 2, 2.5, 3, 4, 5, 6, 7, 9, 100}; | |
133 | ||
134 | //____________________________________________________________ | |
135 | AliGenCorrHF::AliGenCorrHF(): | |
136 | fFileName(0), | |
137 | fFile(0), | |
138 | fQuark(0), | |
139 | fEnergy(0), | |
140 | fBias(0.), | |
141 | fTrials(0), | |
142 | fSelectAll(kFALSE), | |
143 | fDecayer(0), | |
144 | fgIntegral(0) | |
145 | { | |
146 | // Default constructor | |
147 | } | |
148 | ||
149 | //____________________________________________________________ | |
150 | AliGenCorrHF::AliGenCorrHF(Int_t npart, Int_t idquark, Int_t energy): | |
151 | AliGenMC(npart), | |
152 | fFileName(0), | |
153 | fFile(0), | |
154 | fQuark(idquark), | |
155 | fEnergy(energy), | |
156 | fBias(0.), | |
157 | fTrials(0), | |
158 | fSelectAll(kFALSE), | |
159 | fDecayer(0), | |
160 | fgIntegral(0) | |
161 | { | |
162 | // Constructor using particle number, quark type, energy & default InputFile | |
163 | // | |
164 | if (fQuark == 5) { | |
165 | if (fEnergy == 7) | |
166 | fFileName = "$ALICE_ROOT/EVGEN/dataCorrHF/BeautyPP7PythiaMNRwmi.root"; | |
167 | else if (fEnergy == 10) | |
168 | fFileName = "$ALICE_ROOT/EVGEN/dataCorrHF/BeautyPP10PythiaMNRwmi.root"; | |
169 | else if (fEnergy == 14) | |
170 | fFileName = "$ALICE_ROOT/EVGEN/dataCorrHF/BeautyPP14PythiaMNRwmi.root"; | |
171 | else if (fEnergy == 3) | |
172 | fFileName = "$ALICE_ROOT/EVGEN/dataCorrHF/BeautyPbPb276PythiaMNR.root"; | |
173 | else if (fEnergy == 4) | |
174 | fFileName = "$ALICE_ROOT/EVGEN/dataCorrHF/BeautyPbPb394PythiaMNR.root"; | |
175 | else if (fEnergy == 9 || fEnergy == -9) | |
176 | fFileName = "$ALICE_ROOT/EVGEN/dataCorrHF/BeautyPPb88PythiaMNR.root"; | |
177 | else fFileName = "$ALICE_ROOT/EVGEN/dataCorrHF/BeautyPbPb394PythiaMNR.root"; | |
178 | } | |
179 | else { | |
180 | fQuark = 4; | |
181 | if (fEnergy == 7) | |
182 | fFileName = "$ALICE_ROOT/EVGEN/dataCorrHF/CharmPP7PythiaMNRwmi.root"; | |
183 | else if (fEnergy == 10) | |
184 | fFileName = "$ALICE_ROOT/EVGEN/dataCorrHF/CharmPP10PythiaMNRwmi.root"; | |
185 | else if (fEnergy == 14) | |
186 | fFileName = "$ALICE_ROOT/EVGEN/dataCorrHF/CharmPP14PythiaMNRwmi.root"; | |
187 | else if (fEnergy == 3) | |
188 | fFileName = "$ALICE_ROOT/EVGEN/dataCorrHF/CharmPbPb276PythiaMNR.root"; | |
189 | else if (fEnergy == 4) | |
190 | fFileName = "$ALICE_ROOT/EVGEN/dataCorrHF/CharmPbPb394PythiaMNR.root"; | |
191 | else if (fEnergy == 9 || fEnergy == -9) | |
192 | fFileName = "$ALICE_ROOT/EVGEN/dataCorrHF/CharmPPb88PythiaMNR.root"; | |
193 | else fFileName = "$ALICE_ROOT/EVGEN/dataCorrHF/CharmPbPb394PythiaMNR.root"; | |
194 | } | |
195 | fName = "Default"; | |
196 | fTitle= "Generator for correlated pairs of HF hadrons"; | |
197 | ||
198 | fChildSelect.Set(5); | |
199 | for (Int_t i=0; i<5; i++) fChildSelect[i]=0; | |
200 | SetForceDecay(); | |
201 | SetCutOnChild(); | |
202 | SetChildMomentumRange(); | |
203 | SetChildPtRange(); | |
204 | SetChildPhiRange(); | |
205 | SetChildThetaRange(); | |
206 | } | |
207 | ||
208 | //___________________________________________________________________ | |
209 | AliGenCorrHF::AliGenCorrHF(char* tname, Int_t npart, Int_t idquark, Int_t energy): | |
210 | AliGenMC(npart), | |
211 | fFileName(tname), | |
212 | fFile(0), | |
213 | fQuark(idquark), | |
214 | fEnergy(energy), | |
215 | fBias(0.), | |
216 | fTrials(0), | |
217 | fSelectAll(kFALSE), | |
218 | fDecayer(0), | |
219 | fgIntegral(0) | |
220 | { | |
221 | // Constructor using particle number, quark type, energy & user-defined InputFile | |
222 | // | |
223 | if (fQuark != 5) fQuark = 4; | |
224 | fName = "UserDefined"; | |
225 | fTitle= "Generator for correlated pairs of HF hadrons"; | |
226 | ||
227 | fChildSelect.Set(5); | |
228 | for (Int_t i=0; i<5; i++) fChildSelect[i]=0; | |
229 | SetForceDecay(); | |
230 | SetCutOnChild(); | |
231 | SetChildMomentumRange(); | |
232 | SetChildPtRange(); | |
233 | SetChildPhiRange(); | |
234 | SetChildThetaRange(); | |
235 | } | |
236 | ||
237 | //____________________________________________________________ | |
238 | AliGenCorrHF::~AliGenCorrHF() | |
239 | { | |
240 | // Destructor | |
241 | delete fFile; | |
242 | } | |
243 | ||
244 | //____________________________________________________________ | |
245 | void AliGenCorrHF::Init() | |
246 | { | |
247 | // Initialisation | |
248 | AliInfo(Form("Number of HF-hadron pairs = %d",fNpart)); | |
249 | AliInfo(Form(" QQbar kinematics and fragm. functions from: %s",fFileName.Data() )); | |
250 | fFile = TFile::Open(fFileName.Data()); | |
251 | if(!fFile->IsOpen()){ | |
252 | AliError(Form("Could not open file %s",fFileName.Data() )); | |
253 | } | |
254 | ||
255 | ComputeIntegral(fFile); | |
256 | ||
257 | fParentWeight = 1./fNpart; // fNpart is number of HF-hadron pairs | |
258 | ||
259 | // particle decay related initialization | |
260 | ||
261 | if (gMC) fDecayer = gMC->GetDecayer(); | |
262 | fDecayer->SetForceDecay(fForceDecay); | |
263 | fDecayer->Init(); | |
264 | ||
265 | // | |
266 | AliGenMC::Init(); | |
267 | } | |
268 | //____________________________________________________________ | |
269 | void AliGenCorrHF::Generate() | |
270 | { | |
271 | // | |
272 | // Generate fNpart of correlated HF hadron pairs per event | |
273 | // in the the desired theta and momentum windows (phi = 0 - 2pi). | |
274 | // | |
275 | ||
276 | // Reinitialize decayer | |
277 | ||
278 | fDecayer->SetForceDecay(fForceDecay); | |
279 | fDecayer->Init(); | |
280 | ||
281 | Float_t polar[2][3]; // Polarisation of the parent particle (for GEANT tracking) | |
282 | Float_t origin0[2][3]; // Origin of the generated parent particle (for GEANT tracking) | |
283 | Float_t pt, pl, ptot; // Transverse, logitudinal and total momenta of the parent particle | |
284 | Float_t phi, theta; // Phi and theta spherical angles of the parent particle momentum | |
285 | Float_t p[2][3]; // Momenta | |
286 | Int_t nt, i, j, ihad, ipa, ipa0, ipa1, ihadron[2], iquark[2]; | |
287 | Float_t wgtp[2], wgtch[2], random[6]; | |
288 | Float_t pq[2][3], pc[3]; // Momenta of the two quarks | |
289 | Double_t tanhy2, qm = 0; | |
290 | Int_t np[2]; | |
291 | Double_t dphi=0, ptq[2], yq[2], pth[2], plh[2], ph[2], phih[2], phiq[2]; | |
292 | Int_t ncsel[2]; | |
293 | Int_t** pSelected = new Int_t* [2]; | |
294 | Int_t** trackIt = new Int_t* [2]; | |
295 | ||
296 | for (i=0; i<2; i++) { | |
297 | ptq[i] =0; | |
298 | yq[i] =0; | |
299 | pth[i] =0; | |
300 | plh[i] =0; | |
301 | phih[i] =0; | |
302 | phiq[i] =0; | |
303 | ihadron[i] =0; | |
304 | iquark[i] =0; | |
305 | for (j=0; j<3; j++) polar[i][j]=0; | |
306 | } | |
307 | ||
308 | // same quarks mass as in the fragmentation functions | |
309 | if (fQuark == 4) qm = 1.20; | |
310 | else qm = 4.75; | |
311 | ||
312 | TClonesArray *particleshad1 = new TClonesArray("TParticle",1000); | |
313 | TClonesArray *particleshad2 = new TClonesArray("TParticle",1000); | |
314 | ||
315 | TList *particleslist = new TList(); | |
316 | particleslist->Add(particleshad1); | |
317 | particleslist->Add(particleshad2); | |
318 | ||
319 | TDatabasePDG *pDataBase = TDatabasePDG::Instance(); | |
320 | ||
321 | // Calculating vertex position per event | |
322 | for (i=0;i<2;i++){ | |
323 | for (j=0;j<3;j++) origin0[i][j]=fOrigin[j]; | |
324 | if (fVertexSmear==kPerEvent) { | |
325 | Vertex(); | |
326 | for (j=0;j<3;j++) origin0[i][j]=fVertex[j]; | |
327 | } | |
328 | } | |
329 | ||
330 | ipa = 0; | |
331 | ipa1 = 0; | |
332 | ipa0 = 0; | |
333 | ||
334 | // Generating fNpart HF-hadron pairs | |
335 | fNprimaries = 0; | |
336 | ||
337 | while (ipa<2*fNpart) { | |
338 | ||
339 | GetQuarkPair(fFile, fgIntegral, yq[0], yq[1], ptq[0], ptq[1], dphi); | |
340 | ||
341 | GetHadronPair(fFile, fQuark, yq[0], yq[1], ptq[0], ptq[1], ihadron[0], ihadron[1], plh[0], plh[1], pth[0], pth[1]); | |
342 | ||
343 | if (fEnergy == 9 || fEnergy == -9) { // boost particles from c.m.s. to ALICE lab frame | |
344 | Double_t dyBoost = 0.47; | |
345 | Double_t beta = TMath::TanH(dyBoost); | |
346 | Double_t gamma = 1./TMath::Sqrt((1.-beta)*(1.+beta)); | |
347 | Double_t gb = gamma * beta; | |
348 | yq[0] += dyBoost; | |
349 | yq[1] += dyBoost; | |
350 | plh[0] = gb * TMath::Sqrt(plh[0]*plh[0] + pth[0]*pth[0]) + gamma * plh[0]; | |
351 | plh[1] = gb * TMath::Sqrt(plh[1]*plh[1] + pth[1]*pth[1]) + gamma * plh[1]; | |
352 | if (fEnergy == 9) { | |
353 | yq[0] *= -1; | |
354 | yq[1] *= -1; | |
355 | plh[0] *= -1; | |
356 | plh[1] *= -1; | |
357 | } | |
358 | } | |
359 | ||
360 | // Cuts from AliGenerator | |
361 | ||
362 | // Cut on theta | |
363 | theta=TMath::ATan2(pth[0],plh[0]); | |
364 | if (theta<fThetaMin || theta>fThetaMax) continue; | |
365 | theta=TMath::ATan2(pth[1],plh[1]); | |
366 | if (theta<fThetaMin || theta>fThetaMax) continue; | |
367 | ||
368 | // Cut on momentum | |
369 | ph[0]=TMath::Sqrt(pth[0]*pth[0]+plh[0]*plh[0]); | |
370 | if (ph[0]<fPMin || ph[0]>fPMax) continue; | |
371 | ph[1]=TMath::Sqrt(pth[1]*pth[1]+plh[1]*plh[1]); | |
372 | if (ph[1]<fPMin || ph[1]>fPMax) continue; | |
373 | ||
374 | // Add the quarks in the stack | |
375 | ||
376 | phiq[0] = Rndm()*k2PI; | |
377 | if (Rndm() < 0.5) { | |
378 | phiq[1] = phiq[0] + dphi*kDegrad; | |
379 | } else { | |
380 | phiq[1] = phiq[0] - dphi*kDegrad; | |
381 | } | |
382 | if (phiq[1] > k2PI) phiq[1] -= k2PI; | |
383 | if (phiq[1] < 0 ) phiq[1] += k2PI; | |
384 | ||
385 | // quarks pdg | |
386 | iquark[0] = +fQuark; | |
387 | iquark[1] = -fQuark; | |
388 | ||
389 | // px and py | |
390 | TVector2 qvect1 = TVector2(); | |
391 | TVector2 qvect2 = TVector2(); | |
392 | qvect1.SetMagPhi(ptq[0],phiq[0]); | |
393 | qvect2.SetMagPhi(ptq[1],phiq[1]); | |
394 | pq[0][0] = qvect1.Px(); | |
395 | pq[0][1] = qvect1.Py(); | |
396 | pq[1][0] = qvect2.Px(); | |
397 | pq[1][1] = qvect2.Py(); | |
398 | ||
399 | // pz | |
400 | tanhy2 = TMath::TanH(yq[0]); | |
401 | tanhy2 *= tanhy2; | |
402 | pq[0][2] = TMath::Sqrt((ptq[0]*ptq[0]+qm*qm)*tanhy2/(1-tanhy2)); | |
403 | pq[0][2] = TMath::Sign((Double_t)pq[0][2],yq[0]); | |
404 | tanhy2 = TMath::TanH(yq[1]); | |
405 | tanhy2 *= tanhy2; | |
406 | pq[1][2] = TMath::Sqrt((ptq[1]*ptq[1]+qm*qm)*tanhy2/(1-tanhy2)); | |
407 | pq[1][2] = TMath::Sign((Double_t)pq[1][2],yq[1]); | |
408 | ||
409 | // Here we assume that |phi_H1 - phi_H2| = |phi_Q1 - phi_Q2| = dphi | |
410 | // which is a good approximation for heavy flavors in Pythia | |
411 | // ... moreover, same phi angles as for the quarks ... | |
412 | ||
413 | phih[0] = phiq[0]; | |
414 | phih[1] = phiq[1]; | |
415 | ||
416 | ipa1 = 0; | |
417 | ||
418 | for (ihad = 0; ihad < 2; ihad++) { | |
419 | while(1) { | |
420 | ||
421 | ipa0=ipa1; | |
422 | ||
423 | // particle type | |
424 | fChildWeight=(fDecayer->GetPartialBranchingRatio(ihadron[ihad]))*fParentWeight; | |
425 | wgtp[ihad]=fParentWeight; | |
426 | wgtch[ihad]=fChildWeight; | |
427 | TParticlePDG *particle = pDataBase->GetParticle(ihadron[ihad]); | |
428 | Float_t am = particle->Mass(); | |
429 | phi = phih[ihad]; | |
430 | pt = pth[ihad]; | |
431 | pl = plh[ihad]; | |
432 | ptot=TMath::Sqrt(pt*pt+pl*pl); | |
433 | ||
434 | p[ihad][0]=pt*TMath::Cos(phi); | |
435 | p[ihad][1]=pt*TMath::Sin(phi); | |
436 | p[ihad][2]=pl; | |
437 | ||
438 | if(fVertexSmear==kPerTrack) { | |
439 | Rndm(random,6); | |
440 | for (j=0;j<3;j++) { | |
441 | origin0[ihad][j]= | |
442 | fOrigin[j]+fOsigma[j]*TMath::Cos(2*random[2*j]*TMath::Pi())* | |
443 | TMath::Sqrt(-2*TMath::Log(random[2*j+1])); | |
444 | } | |
445 | } | |
446 | ||
447 | // Looking at fForceDecay : | |
448 | // if fForceDecay != none Primary particle decays using | |
449 | // AliPythia and children are tracked by GEANT | |
450 | // | |
451 | // if fForceDecay == none Primary particle is tracked by GEANT | |
452 | // (In the latest, make sure that GEANT actually does all the decays you want) | |
453 | ||
454 | if (fForceDecay != kNoDecay) { | |
455 | // Using lujet to decay particle | |
456 | Float_t energy=TMath::Sqrt(ptot*ptot+am*am); | |
457 | TLorentzVector pmom(p[ihad][0], p[ihad][1], p[ihad][2], energy); | |
458 | fDecayer->Decay(ihadron[ihad],&pmom); | |
459 | ||
460 | // select decay particles | |
461 | ||
462 | np[ihad]=fDecayer->ImportParticles((TClonesArray *)particleslist->At(ihad)); | |
463 | ||
464 | // Selecting GeometryAcceptance for particles fPdgCodeParticleforAcceptanceCut; | |
465 | ||
466 | if (fGeometryAcceptance) | |
467 | if (!CheckAcceptanceGeometry(np[ihad],(TClonesArray*)particleslist->At(ihad))) continue; | |
468 | ||
469 | trackIt[ihad] = new Int_t [np[ihad]]; | |
470 | pSelected[ihad] = new Int_t [np[ihad]]; | |
471 | Int_t* pFlag = new Int_t [np[ihad]]; | |
472 | ||
473 | for (i=0; i<np[ihad]; i++) { | |
474 | pFlag[i] = 0; | |
475 | pSelected[ihad][i] = 0; | |
476 | } | |
477 | ||
478 | if (np[ihad] >1) { | |
479 | TParticle* iparticle = 0; | |
480 | Int_t ipF, ipL; | |
481 | ||
482 | for (i = 1; i<np[ihad] ; i++) { | |
483 | trackIt[ihad][i] = 1; | |
484 | iparticle = | |
485 | (TParticle *) ((TClonesArray *) particleslist->At(ihad))->At(i); | |
486 | Int_t kf = iparticle->GetPdgCode(); | |
487 | Int_t ks = iparticle->GetStatusCode(); | |
488 | // flagged particle | |
489 | if (pFlag[i] == 1) { | |
490 | ipF = iparticle->GetFirstDaughter(); | |
491 | ipL = iparticle->GetLastDaughter(); | |
492 | if (ipF > 0) for (j=ipF-1; j<ipL; j++) pFlag[j]=1; | |
493 | continue; | |
494 | } | |
495 | ||
496 | // flag decay products of particles with long life-time (c tau > .3 mum) | |
497 | if (ks != 1) { | |
498 | Double_t lifeTime = fDecayer->GetLifetime(kf); | |
499 | if (lifeTime > (Double_t) fMaxLifeTime) { | |
500 | ipF = iparticle->GetFirstDaughter(); | |
501 | ipL = iparticle->GetLastDaughter(); | |
502 | if (ipF > 0) for (j=ipF-1; j<ipL; j++) pFlag[j]=1; | |
503 | } else { | |
504 | trackIt[ihad][i] = 0; | |
505 | pSelected[ihad][i] = 1; | |
506 | } | |
507 | } // ks==1 ? | |
508 | // | |
509 | // children | |
510 | if ((ChildSelected(TMath::Abs(kf)) || fForceDecay == kAll || fSelectAll) && trackIt[ihad][i]) | |
511 | { | |
512 | if (fCutOnChild) { | |
513 | pc[0]=iparticle->Px(); | |
514 | pc[1]=iparticle->Py(); | |
515 | pc[2]=iparticle->Pz(); | |
516 | //printf("px %f py %f pz %f\n",pc[0],pc[1],pc[2]); | |
517 | Bool_t childok = KinematicSelection(iparticle, 1); | |
518 | if(childok) { | |
519 | pSelected[ihad][i] = 1; | |
520 | ncsel[ihad]++; | |
521 | } else { | |
522 | ncsel[ihad]=-1; | |
523 | break; | |
524 | } // child kine cuts | |
525 | } else { | |
526 | pSelected[ihad][i] = 1; | |
527 | ncsel[ihad]++; | |
528 | } // if child selection | |
529 | } // select muon | |
530 | } // decay particle loop | |
531 | } // if decay products | |
532 | ||
533 | if ((fCutOnChild && ncsel[ihad] >0) || !fCutOnChild) ipa1++; | |
534 | ||
535 | if (pFlag) delete[] pFlag; | |
536 | ||
537 | } // kinematic selection | |
538 | else // nodecay option, so parent will be tracked by GEANT (pions, kaons, eta, omegas, baryons) | |
539 | { | |
540 | gAlice->GetMCApp()-> | |
541 | PushTrack(fTrackIt,-1,ihadron[ihad],p[ihad],origin0[ihad],polar[ihad],0,kPPrimary,nt,wgtp[ihad]); | |
542 | ipa1++; | |
543 | fNprimaries++; | |
544 | ||
545 | } | |
546 | break; | |
547 | } // while(1) loop | |
548 | if (ipa1<ipa0+1){ | |
549 | ipa1=0; | |
550 | if (pSelected[ihad]) delete pSelected[ihad]; | |
551 | if (trackIt[ihad]) delete trackIt[ihad]; | |
552 | particleshad1->Clear(); | |
553 | particleshad2->Clear(); | |
554 | break; | |
555 | }//go out of loop and generate new pair if at least one hadron is rejected | |
556 | } // hadron pair loop | |
557 | if(ipa1==2){ | |
558 | ||
559 | ipa=ipa+ipa1; | |
560 | ||
561 | if(fForceDecay != kNoDecay){ | |
562 | for(ihad=0;ihad<2;ihad++){ | |
563 | ||
564 | //load tracks in the stack if both hadrons of the pair accepted | |
565 | LoadTracks(iquark[ihad],pq[ihad],ihadron[ihad],p[ihad],np[ihad], | |
566 | (TClonesArray *)particleslist->At(ihad),origin0[ihad], | |
567 | polar[ihad],wgtp[ihad],wgtch[ihad],nt,ncsel[ihad], | |
568 | pSelected[ihad],trackIt[ihad]); | |
569 | ||
570 | if (pSelected[ihad]) delete pSelected[ihad]; | |
571 | if (trackIt[ihad]) delete trackIt[ihad]; | |
572 | ||
573 | } | |
574 | particleshad1->Clear(); | |
575 | particleshad2->Clear(); | |
576 | } | |
577 | } | |
578 | } // while (ipa<2*fNpart) loop | |
579 | ||
580 | SetHighWaterMark(nt); | |
581 | ||
582 | AliGenEventHeader* header = new AliGenEventHeader("CorrHF"); | |
583 | header->SetPrimaryVertex(fVertex); | |
584 | header->SetNProduced(fNprimaries); | |
585 | AddHeader(header); | |
586 | ||
587 | ||
588 | delete particleshad1; | |
589 | delete particleshad2; | |
590 | delete particleslist; | |
591 | ||
592 | delete[] pSelected; | |
593 | delete[] trackIt; | |
594 | } | |
595 | //____________________________________________________________________________________ | |
596 | void AliGenCorrHF::IpCharm(TH2F *hProbHH, Int_t &pdg3, Int_t &pdg4) | |
597 | { | |
598 | // Composition of a lower state charm hadron pair from a ccbar quark pair | |
599 | Int_t pdgH[] = {411, 421, 431, 4122, 4132, 4232, 4332}; | |
600 | ||
601 | Double_t id3, id4; | |
602 | hProbHH->GetRandom2(id3, id4); | |
603 | pdg3 = pdgH[(Int_t)TMath::Floor(id3)]; | |
604 | pdg4 = -1*pdgH[(Int_t)TMath::Floor(id4)]; | |
605 | ||
606 | return; | |
607 | } | |
608 | ||
609 | void AliGenCorrHF::IpBeauty(TH2F *hProbHH, Int_t &pdg3, Int_t &pdg4) | |
610 | { | |
611 | // Composition of a lower state beauty hadron pair from a bbbar quark pair | |
612 | // B-Bbar mixing will be done by Pythia at their decay point | |
613 | Int_t pdgH[] = {511, 521, 531, 5122, 5132, 5232, 5332}; | |
614 | ||
615 | Double_t id3, id4; | |
616 | hProbHH->GetRandom2(id3, id4); | |
617 | pdg3 = pdgH[(Int_t)TMath::Floor(id3)]; | |
618 | pdg4 = -1*pdgH[(Int_t)TMath::Floor(id4)]; | |
619 | ||
620 | if ( (pdg3== 511) || (pdg3== 521) || (pdg3== 531) ) pdg3 *= -1; | |
621 | if ( (pdg4==-511) || (pdg4==-521) || (pdg4==-531) ) pdg4 *= -1; | |
622 | ||
623 | return; | |
624 | } | |
625 | ||
626 | //____________________________________________________________________________________ | |
627 | Double_t AliGenCorrHF::ComputeIntegral(TFile* fG) // needed by GetQuarkPair | |
628 | { | |
629 | // Read QQbar kinematical 5D grid's cell occupancy weights | |
630 | Int_t cell[6]; // cell[6]={wght,iy1,iy2,ipt1,ipt2,idph} | |
631 | TTree* tG = (TTree*) fG->Get("tGqq"); | |
632 | tG->GetBranch("cell")->SetAddress(&cell); | |
633 | Int_t nbins = tG->GetEntries(); | |
634 | ||
635 | // delete previously computed integral (if any) | |
636 | if(fgIntegral) delete [] fgIntegral; | |
637 | ||
638 | fgIntegral = new Double_t[nbins+1]; | |
639 | fgIntegral[0] = 0; | |
640 | Int_t bin; | |
641 | for(bin=0;bin<nbins;bin++) { | |
642 | tG->GetEvent(bin); | |
643 | fgIntegral[bin+1] = fgIntegral[bin] + cell[0]; | |
644 | } | |
645 | // Normalize integral to 1 | |
646 | if (fgIntegral[nbins] == 0 ) { | |
647 | return 0; | |
648 | } | |
649 | for (bin=1;bin<=nbins;bin++) fgIntegral[bin] /= fgIntegral[nbins]; | |
650 | ||
651 | return fgIntegral[nbins]; | |
652 | } | |
653 | ||
654 | ||
655 | //____________________________________________________________________________________ | |
656 | void AliGenCorrHF::GetQuarkPair(TFile* fG, Double_t* fInt, Double_t &y1, Double_t &y2, Double_t &pt1, Double_t &pt2, Double_t &dphi) | |
657 | // modification of ROOT's TH3::GetRandom3 for 5D | |
658 | { | |
659 | // Read QQbar kinematical 5D grid's cell coordinates | |
660 | Int_t cell[6]; // cell[6]={wght,iy1,iy2,ipt1,ipt2,idph} | |
661 | TTree* tG = (TTree*) fG->Get("tGqq"); | |
662 | tG->GetBranch("cell")->SetAddress(&cell); | |
663 | Int_t nbins = tG->GetEntries(); | |
664 | Double_t rand[6]; | |
665 | gRandom->RndmArray(6,rand); | |
666 | Int_t ibin = TMath::BinarySearch(nbins,fInt,rand[0]); | |
667 | tG->GetEvent(ibin); | |
668 | y1 = fgy[cell[1]] + (fgy[cell[1]+1]-fgy[cell[1]])*rand[1]; | |
669 | y2 = fgy[cell[2]] + (fgy[cell[2]+1]-fgy[cell[2]])*rand[2]; | |
670 | pt1 = fgpt[cell[3]] + (fgpt[cell[3]+1]-fgpt[cell[3]])*rand[3]; | |
671 | pt2 = fgpt[cell[4]] + (fgpt[cell[4]+1]-fgpt[cell[4]])*rand[4]; | |
672 | dphi = fgdph[cell[5]]+ (fgdph[cell[5]+1]-fgdph[cell[5]])*rand[5]; | |
673 | } | |
674 | ||
675 | //____________________________________________________________________________________ | |
676 | 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) | |
677 | { | |
678 | // Generate a hadron pair | |
679 | void (*fIpParaFunc)(TH2F *, Int_t &, Int_t &);//Pointer to hadron pair composition function | |
680 | fIpParaFunc = IpCharm; | |
681 | Double_t mq = 1.2; // c & b quark masses (used in AliPythia) | |
682 | if (idq == 5) { | |
683 | fIpParaFunc = IpBeauty; | |
684 | mq = 4.75; | |
685 | } | |
686 | Double_t z11 = 0.; | |
687 | Double_t z12 = 0.; | |
688 | Double_t z21 = 0.; | |
689 | Double_t z22 = 0.; | |
690 | Double_t pz1, pz2, e1, e2, mh, ptemp, rand[2]; | |
691 | char tag[100]; | |
692 | TH2F *h2h[12], *h2s[12], *hProbHH; // hard & soft fragmentation and HH-probability functions | |
693 | for (Int_t ipt = 0; ipt<fgnptbins; ipt++) { | |
694 | snprintf(tag,100, "h2h_pt%d",ipt); | |
695 | h2h[ipt] = (TH2F*) fG->Get(tag); | |
696 | snprintf(tag,100, "h2s_pt%d",ipt); | |
697 | h2s[ipt] = (TH2F*) fG->Get(tag); | |
698 | } | |
699 | ||
700 | if (y1*y2 < 0) { | |
701 | for (Int_t ipt = 0; ipt<fgnptbins; ipt++) { | |
702 | if(pt1 >= fgptbmin[ipt] && pt1 < fgptbmax[ipt]) | |
703 | h2h[ipt]->GetRandom2(z11, z21); | |
704 | if(pt2 >= fgptbmin[ipt] && pt2 < fgptbmax[ipt]) | |
705 | h2h[ipt]->GetRandom2(z12, z22); | |
706 | } | |
707 | } | |
708 | else { | |
709 | if (TMath::Abs(y1) > TMath::Abs(y2)) { | |
710 | for (Int_t ipt = 0; ipt<fgnptbins; ipt++) { | |
711 | if(pt1 >= fgptbmin[ipt] && pt1 < fgptbmax[ipt]) | |
712 | h2h[ipt]->GetRandom2(z11, z21); | |
713 | if(pt2 >= fgptbmin[ipt] && pt2 < fgptbmax[ipt]) | |
714 | h2s[ipt]->GetRandom2(z12, z22); | |
715 | } | |
716 | } | |
717 | else { | |
718 | for (Int_t ipt = 0; ipt<fgnptbins; ipt++) { | |
719 | if(pt1 >= fgptbmin[ipt] && pt1 < fgptbmax[ipt]) | |
720 | h2s[ipt]->GetRandom2(z11, z21); | |
721 | if(pt2 >= fgptbmin[ipt] && pt2 < fgptbmax[ipt]) | |
722 | h2h[ipt]->GetRandom2(z12, z22); | |
723 | } | |
724 | } | |
725 | } | |
726 | gRandom->RndmArray(2,rand); | |
727 | ptemp = TMath::Sqrt(pt1*pt1 + mq*mq); | |
728 | pz1 = ptemp*TMath::SinH(y1); | |
729 | e1 = ptemp*TMath::CosH(y1); | |
730 | ptemp = TMath::Sqrt(pt2*pt2 + mq*mq); | |
731 | pz2 = ptemp*TMath::SinH(y2); | |
732 | e2 = ptemp*TMath::CosH(y2); | |
733 | ||
734 | hProbHH = (TH2F*)fG->Get("hProbHH"); | |
735 | fIpParaFunc(hProbHH, id3, id4); | |
736 | mh = TDatabasePDG::Instance()->GetParticle(id3)->Mass(); | |
737 | ptemp = z11*z21*(e1*e1-pz1*pz1) - mh*mh; | |
738 | if (idq==5) pt3 = pt1; // an approximation at low pt, try better | |
739 | else pt3 = rand[0]; // pt3=pt1 gives less D-hadrons at low pt | |
740 | if (ptemp > 0) pt3 = TMath::Sqrt(ptemp); | |
741 | if (pz1 > 0) pz3 = (z11*(e1 + pz1) - z21*(e1 - pz1)) / 2; | |
742 | else pz3 = (z21*(e1 + pz1) - z11*(e1 - pz1)) / 2; | |
743 | e1 = TMath::Sqrt(pz3*pz3 + pt3*pt3 + mh*mh); | |
744 | ||
745 | mh = TDatabasePDG::Instance()->GetParticle(id4)->Mass(); | |
746 | ptemp = z12*z22*(e2*e2-pz2*pz2) - mh*mh; | |
747 | if (idq==5) pt4 = pt2; // an approximation at low pt, try better | |
748 | else pt4 = rand[1]; | |
749 | if (ptemp > 0) pt4 = TMath::Sqrt(ptemp); | |
750 | if (pz2 > 0) pz4 = (z12*(e2 + pz2) - z22*(e2 - pz2)) / 2; | |
751 | else pz4 = (z22*(e2 + pz2) - z12*(e2 - pz2)) / 2; | |
752 | e2 = TMath::Sqrt(pz4*pz4 + pt4*pt4 + mh*mh); | |
753 | ||
754 | // small corr. instead of using Frag. Func. depending on yQ (in addition to ptQ) | |
755 | Float_t ycorr = 0.2, y3, y4; | |
756 | gRandom->RndmArray(2,rand); | |
757 | y3 = 0.5 * TMath::Log((e1 + pz3 + 1.e-13)/(e1 - pz3 + 1.e-13)); | |
758 | y4 = 0.5 * TMath::Log((e2 + pz4 + 1.e-13)/(e2 - pz4 + 1.e-13)); | |
759 | if(TMath::Abs(y3)<ycorr && TMath::Abs(y4)<ycorr && rand[0]>0.5) { | |
760 | ptemp = TMath::Sqrt((e1-pz3)*(e1+pz3)); | |
761 | y3 = 4*(1 - 2*rand[1]); | |
762 | pz3 = ptemp*TMath::SinH(y3); | |
763 | pz4 = pz3; | |
764 | } | |
765 | } | |
766 | ||
767 | ||
768 | //____________________________________________________________________________________ | |
769 | void AliGenCorrHF::LoadTracks(Int_t iquark, Float_t *pq, | |
770 | Int_t iPart, Float_t *p, | |
771 | Int_t np, TClonesArray *particles, | |
772 | Float_t *origin0, Float_t *polar, | |
773 | Float_t wgtp, Float_t wgtch, | |
774 | Int_t &nt, Int_t ncsel, Int_t *pSelected, | |
775 | Int_t *trackIt){ | |
776 | Int_t i; | |
777 | Int_t ntq=-1; | |
778 | Int_t* pParent = new Int_t[np]; | |
779 | Float_t pc[3], och[3]; | |
780 | Int_t iparent; | |
781 | ||
782 | for(i=0;i<np;i++) pParent[i]=-1; | |
783 | ||
784 | if ((fCutOnChild && ncsel >0) || !fCutOnChild){ | |
785 | // Parents | |
786 | // quark | |
787 | PushTrack(0, -1, iquark, pq, origin0, polar, 0, kPPrimary, nt, wgtp); | |
788 | KeepTrack(nt); | |
789 | ntq = nt; | |
790 | // hadron | |
791 | PushTrack(0, ntq, iPart, p, origin0, polar, 0, kPDecay, nt, wgtp); | |
792 | pParent[0] = nt; | |
793 | KeepTrack(nt); | |
794 | fNprimaries++; | |
795 | ||
796 | // Decay Products | |
797 | for (i = 1; i < np; i++) { | |
798 | if (pSelected[i]) { | |
799 | ||
800 | TParticle* iparticle = (TParticle *) particles->At(i); | |
801 | Int_t kf = iparticle->GetPdgCode(); | |
802 | Int_t jpa = iparticle->GetFirstMother()-1; | |
803 | ||
804 | och[0] = origin0[0]+iparticle->Vx()/10; | |
805 | och[1] = origin0[1]+iparticle->Vy()/10; | |
806 | och[2] = origin0[2]+iparticle->Vz()/10; | |
807 | pc[0] = iparticle->Px(); | |
808 | pc[1] = iparticle->Py(); | |
809 | pc[2] = iparticle->Pz(); | |
810 | ||
811 | if (jpa > -1) { | |
812 | iparent = pParent[jpa]; | |
813 | } else { | |
814 | iparent = -1; | |
815 | } | |
816 | ||
817 | PushTrack(fTrackIt*trackIt[i], iparent, kf, | |
818 | pc, och, polar, | |
819 | 0, kPDecay, nt, wgtch); | |
820 | pParent[i] = nt; | |
821 | KeepTrack(nt); | |
822 | fNprimaries++; | |
823 | ||
824 | } // Selected | |
825 | } // Particle loop | |
826 | } | |
827 | if (pParent) delete[] pParent; | |
828 | ||
829 | return; | |
830 | } | |
831 |