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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 2.76, 7, 8, 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 2.76 and 3.94 TeV, for p-Pb & Pb-p at 5 and 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 | // June 12: added p-Pb & Pb-p at 5 TeV (S. Grigoryan) | |
42 | // April 13: added p-p at 2.76 and 8 TeV (S. Grigoryan) | |
43 | // | |
44 | //------------------------------------------------------------------------- | |
45 | // How it works (for the given flavor and p-p energy): | |
46 | // | |
47 | // 1) Reads QQbar kinematical grid (TTree) from the Input file and generates | |
48 | // quark pairs according to the weights of the cells. | |
49 | // It is a 5D grid in y1,y2,pt1,pt2 and deltaphi, with occupancy weights | |
50 | // of the cells obtained from Pythia (see details in GetQuarkPair). | |
51 | // 2) Reads "soft" and "hard" fragmentation functions (12 2D-histograms each, | |
52 | // for 12 pt bins) from the Input file, applies to quarks and produces hadrons | |
53 | // (only lower states, with proportions of species obtained from Pythia). | |
54 | // Fragmentation functions are the same for all hadron species and depend | |
55 | // on 2 variables - light cone energy-momentum fractions: | |
56 | // z1=(E_H + Pz_H)/(E_Q + Pz_Q), z2=(E_H - Pz_H)/(E_Q - Pz_Q). | |
57 | // "soft" & "hard" FFs correspond to "slower" & "faster" quark of a pair | |
58 | // (see details in GetHadronPair). Fragmentation does not depend on p-p energy. | |
59 | // 3) Decays the hadrons and saves all the particles in the event stack in the | |
60 | // following order: HF hadron from Q, then its decay products, then HF hadron | |
61 | // from Qbar, then its decay productes, then next HF hadon pair (if any) | |
62 | // in the same way, etc... | |
63 | // 4) It is fast, e.g., generates the same number of events with a beauty pair | |
64 | // ~15 times faster than AliGenPythia with kBeautyppMNRwmi (w/o tracking) | |
65 | // | |
66 | // An Input file for each quark flavor and p-p energy is in EVGEN/dataCorrHF/ | |
67 | // One can use also user-defined Input files. | |
68 | // | |
69 | // More details could be found in my presentation at DiMuonNet Workshop, Dec 2006: | |
70 | // http://www-dapnia.cea.fr/Sphn/Alice/DiMuonNet. | |
71 | // | |
72 | //------------------------------------------------------------------------- | |
73 | // How to use it: | |
74 | // | |
75 | // add the following typical lines in Config.C | |
76 | /* | |
77 | // An example for correlated charm or beauty hadron pair production at 14 TeV | |
78 | ||
79 | // AliGenCorrHF *gener = new AliGenCorrHF(1, 4, 14); // for charm, 1 pair per event | |
80 | AliGenCorrHF *gener = new AliGenCorrHF(1, 5, 14); // for beauty, 1 pair per event | |
81 | ||
82 | gener->SetMomentumRange(0,9999); | |
83 | gener->SetCutOnChild(0); // 1/0 means cuts on children enable/disable | |
84 | gener->SetChildThetaRange(171.0,178.0); | |
85 | gener->SetOrigin(0,0,0); //vertex position | |
86 | gener->SetSigma(0,0,0); //Sigma in (X,Y,Z) (cm) on IP position | |
87 | gener->SetForceDecay(kSemiMuonic); | |
88 | gener->SetSelectAll(kTRUE); //Force the transport of all particles. | |
89 | //Necessary while using a different | |
90 | //option than kAll for SetForceDecay | |
91 | gener->SetTrackingFlag(1); //1: Decay during transport, | |
92 | //0: No Decay during transport | |
93 | gener->Init(); | |
94 | */ | |
95 | // One can include AliGenCorrHF in an AliGenCocktail generator. | |
96 | //-------------------------------------------------------------------------- | |
97 | ||
98 | #include <Riostream.h> | |
99 | #include <TCanvas.h> | |
100 | #include <TClonesArray.h> | |
101 | #include <TDatabasePDG.h> | |
102 | #include <TFile.h> | |
103 | #include <TH2F.h> | |
104 | #include <TLorentzVector.h> | |
105 | #include <TMath.h> | |
106 | #include <TParticle.h> | |
107 | #include <TParticlePDG.h> | |
108 | #include <TROOT.h> | |
109 | #include <TRandom.h> | |
110 | #include <TTree.h> | |
111 | #include <TVirtualMC.h> | |
112 | #include <TVector3.h> | |
113 | ||
114 | #include "AliGenCorrHF.h" | |
115 | #include "AliLog.h" | |
116 | #include "AliConst.h" | |
117 | #include "AliDecayer.h" | |
118 | #include "AliMC.h" | |
119 | #include "AliRun.h" | |
120 | #include "AliGenEventHeader.h" | |
121 | ||
122 | ClassImp(AliGenCorrHF) | |
123 | ||
124 | //Begin_Html | |
125 | /* | |
126 | <img src="picts/AliGenCorrHF.gif"> | |
127 | */ | |
128 | //End_Html | |
129 | ||
130 | Double_t AliGenCorrHF::fgdph[19] = {0, 10, 20, 30, 40, 50, 60, 70, 80, 90, 100, 110, 120, 130, 140, 150, 160, 170, 180}; | |
131 | 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}; | |
132 | 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}; | |
133 | Int_t AliGenCorrHF::fgnptbins = 12; | |
134 | Double_t AliGenCorrHF::fgptbmin[12] = {0, 0.5, 1, 1.5, 2, 2.5, 3, 4, 5, 6, 7, 9}; | |
135 | Double_t AliGenCorrHF::fgptbmax[12] = {0.5, 1, 1.5, 2, 2.5, 3, 4, 5, 6, 7, 9, 100}; | |
136 | ||
137 | //____________________________________________________________ | |
138 | AliGenCorrHF::AliGenCorrHF(): | |
139 | fFileName(0), | |
140 | fFile(0), | |
141 | fQuark(0), | |
142 | fEnergy(0), | |
143 | fBias(0.), | |
144 | fTrials(0), | |
145 | fSelectAll(kFALSE), | |
146 | fDecayer(0), | |
147 | fgIntegral(0) | |
148 | { | |
149 | // Default constructor | |
150 | } | |
151 | ||
152 | //____________________________________________________________ | |
153 | AliGenCorrHF::AliGenCorrHF(Int_t npart, Int_t idquark, Int_t energy): | |
154 | AliGenMC(npart), | |
155 | fFileName(0), | |
156 | fFile(0), | |
157 | fQuark(idquark), | |
158 | fEnergy(energy), | |
159 | fBias(0.), | |
160 | fTrials(0), | |
161 | fSelectAll(kFALSE), | |
162 | fDecayer(0), | |
163 | fgIntegral(0) | |
164 | { | |
165 | // Constructor using particle number, quark type, energy & default InputFile | |
166 | // | |
167 | if (fQuark == 5) { | |
168 | if (fEnergy == 7) | |
169 | fFileName = "$ALICE_ROOT/EVGEN/dataCorrHF/BeautyPP7PythiaMNRwmi.root"; | |
170 | else if (fEnergy == 8) | |
171 | fFileName = "$ALICE_ROOT/EVGEN/dataCorrHF/BeautyPP8PythiaMNRwmi.root"; | |
172 | else if (fEnergy == 10) | |
173 | fFileName = "$ALICE_ROOT/EVGEN/dataCorrHF/BeautyPP10PythiaMNRwmi.root"; | |
174 | else if (fEnergy == 14) | |
175 | fFileName = "$ALICE_ROOT/EVGEN/dataCorrHF/BeautyPP14PythiaMNRwmi.root"; | |
176 | else if (fEnergy == 2) | |
177 | fFileName = "$ALICE_ROOT/EVGEN/dataCorrHF/BeautyPP276PythiaMNRwmi.root"; | |
178 | else if (fEnergy == 3) | |
179 | fFileName = "$ALICE_ROOT/EVGEN/dataCorrHF/BeautyPbPb276PythiaMNR.root"; | |
180 | else if (fEnergy == 4) | |
181 | fFileName = "$ALICE_ROOT/EVGEN/dataCorrHF/BeautyPbPb394PythiaMNR.root"; | |
182 | else if (fEnergy == 5 || fEnergy == -5) | |
183 | fFileName = "$ALICE_ROOT/EVGEN/dataCorrHF/BeautyPPb5PythiaMNR.root"; | |
184 | else if (fEnergy == 9 || fEnergy == -9) | |
185 | fFileName = "$ALICE_ROOT/EVGEN/dataCorrHF/BeautyPPb88PythiaMNR.root"; | |
186 | else fFileName = "$ALICE_ROOT/EVGEN/dataCorrHF/BeautyPbPb394PythiaMNR.root"; | |
187 | } | |
188 | else { | |
189 | fQuark = 4; | |
190 | if (fEnergy == 7) | |
191 | fFileName = "$ALICE_ROOT/EVGEN/dataCorrHF/CharmPP7PythiaMNRwmi.root"; | |
192 | else if (fEnergy == 8) | |
193 | fFileName = "$ALICE_ROOT/EVGEN/dataCorrHF/CharmPP8PythiaMNRwmi.root"; | |
194 | else if (fEnergy == 10) | |
195 | fFileName = "$ALICE_ROOT/EVGEN/dataCorrHF/CharmPP10PythiaMNRwmi.root"; | |
196 | else if (fEnergy == 14) | |
197 | fFileName = "$ALICE_ROOT/EVGEN/dataCorrHF/CharmPP14PythiaMNRwmi.root"; | |
198 | else if (fEnergy == 2) | |
199 | fFileName = "$ALICE_ROOT/EVGEN/dataCorrHF/CharmPP276PythiaMNRwmi.root"; | |
200 | else if (fEnergy == 3) | |
201 | fFileName = "$ALICE_ROOT/EVGEN/dataCorrHF/CharmPbPb276PythiaMNR.root"; | |
202 | else if (fEnergy == 4) | |
203 | fFileName = "$ALICE_ROOT/EVGEN/dataCorrHF/CharmPbPb394PythiaMNR.root"; | |
204 | else if (fEnergy == 5 || fEnergy == -5) | |
205 | fFileName = "$ALICE_ROOT/EVGEN/dataCorrHF/CharmPPb5PythiaMNR.root"; | |
206 | else if (fEnergy == 9 || fEnergy == -9) | |
207 | fFileName = "$ALICE_ROOT/EVGEN/dataCorrHF/CharmPPb88PythiaMNR.root"; | |
208 | else fFileName = "$ALICE_ROOT/EVGEN/dataCorrHF/CharmPbPb394PythiaMNR.root"; | |
209 | } | |
210 | fName = "Default"; | |
211 | fTitle= "Generator for correlated pairs of HF hadrons"; | |
212 | ||
213 | fChildSelect.Set(5); | |
214 | for (Int_t i=0; i<5; i++) fChildSelect[i]=0; | |
215 | SetForceDecay(); | |
216 | SetCutOnChild(); | |
217 | SetChildMomentumRange(); | |
218 | SetChildPtRange(); | |
219 | SetChildPhiRange(); | |
220 | SetChildThetaRange(); | |
221 | } | |
222 | ||
223 | //___________________________________________________________________ | |
224 | AliGenCorrHF::AliGenCorrHF(char* tname, Int_t npart, Int_t idquark, Int_t energy): | |
225 | AliGenMC(npart), | |
226 | fFileName(tname), | |
227 | fFile(0), | |
228 | fQuark(idquark), | |
229 | fEnergy(energy), | |
230 | fBias(0.), | |
231 | fTrials(0), | |
232 | fSelectAll(kFALSE), | |
233 | fDecayer(0), | |
234 | fgIntegral(0) | |
235 | { | |
236 | // Constructor using particle number, quark type, energy & user-defined InputFile | |
237 | // | |
238 | if (fQuark != 5) fQuark = 4; | |
239 | fName = "UserDefined"; | |
240 | fTitle= "Generator for correlated pairs of HF hadrons"; | |
241 | ||
242 | fChildSelect.Set(5); | |
243 | for (Int_t i=0; i<5; i++) fChildSelect[i]=0; | |
244 | SetForceDecay(); | |
245 | SetCutOnChild(); | |
246 | SetChildMomentumRange(); | |
247 | SetChildPtRange(); | |
248 | SetChildPhiRange(); | |
249 | SetChildThetaRange(); | |
250 | } | |
251 | ||
252 | //____________________________________________________________ | |
253 | AliGenCorrHF::~AliGenCorrHF() | |
254 | { | |
255 | // Destructor | |
256 | delete fFile; | |
257 | } | |
258 | ||
259 | //____________________________________________________________ | |
260 | void AliGenCorrHF::Init() | |
261 | { | |
262 | // Initialisation | |
263 | AliInfo(Form("Number of HF-hadron pairs = %d",fNpart)); | |
264 | AliInfo(Form(" QQbar kinematics and fragm. functions from: %s",fFileName.Data() )); | |
265 | fFile = TFile::Open(fFileName.Data()); | |
266 | if(!fFile->IsOpen()){ | |
267 | AliError(Form("Could not open file %s",fFileName.Data() )); | |
268 | } | |
269 | ||
270 | ComputeIntegral(fFile); | |
271 | ||
272 | fParentWeight = 1./fNpart; // fNpart is number of HF-hadron pairs | |
273 | ||
274 | // particle decay related initialization | |
275 | ||
276 | if (TVirtualMC::GetMC()) fDecayer = TVirtualMC::GetMC()->GetDecayer(); | |
277 | fDecayer->SetForceDecay(fForceDecay); | |
278 | fDecayer->Init(); | |
279 | ||
280 | // | |
281 | AliGenMC::Init(); | |
282 | } | |
283 | //____________________________________________________________ | |
284 | void AliGenCorrHF::Generate() | |
285 | { | |
286 | // | |
287 | // Generate fNpart of correlated HF hadron pairs per event | |
288 | // in the the desired theta and momentum windows (phi = 0 - 2pi). | |
289 | // | |
290 | ||
291 | // Reinitialize decayer | |
292 | ||
293 | fDecayer->SetForceDecay(fForceDecay); | |
294 | fDecayer->Init(); | |
295 | ||
296 | Float_t polar[2][3]; // Polarisation of the parent particle (for GEANT tracking) | |
297 | Float_t origin0[2][3]; // Origin of the generated parent particle (for GEANT tracking) | |
298 | Float_t pt, pl, ptot; // Transverse, logitudinal and total momenta of the parent particle | |
299 | Float_t phi, theta; // Phi and theta spherical angles of the parent particle momentum | |
300 | Float_t p[2][3]; // Momenta | |
301 | Int_t nt, i, j, ihad, ipa, ipa0, ipa1, ihadron[2], iquark[2]; | |
302 | Float_t wgtp[2], wgtch[2], random[6]; | |
303 | Float_t pq[2][3], pc[3]; // Momenta of the two quarks | |
304 | Double_t tanhy2, qm = 0; | |
305 | Int_t np[2]; | |
306 | Double_t dphi=0, ptq[2], yq[2], pth[2], plh[2], ph[2], phih[2], phiq[2]; | |
307 | Int_t ncsel[2]; | |
308 | Int_t** pSelected = new Int_t* [2]; | |
309 | Int_t** trackIt = new Int_t* [2]; | |
310 | ||
311 | for (i=0; i<2; i++) { | |
312 | ptq[i] =0; | |
313 | yq[i] =0; | |
314 | pth[i] =0; | |
315 | plh[i] =0; | |
316 | phih[i] =0; | |
317 | phiq[i] =0; | |
318 | ihadron[i] =0; | |
319 | iquark[i] =0; | |
320 | for (j=0; j<3; j++) polar[i][j]=0; | |
321 | } | |
322 | ||
323 | // same quarks mass as in the fragmentation functions | |
324 | if (fQuark == 4) qm = 1.20; | |
325 | else qm = 4.75; | |
326 | ||
327 | TClonesArray *particleshad1 = new TClonesArray("TParticle",1000); | |
328 | TClonesArray *particleshad2 = new TClonesArray("TParticle",1000); | |
329 | ||
330 | TList *particleslist = new TList(); | |
331 | particleslist->Add(particleshad1); | |
332 | particleslist->Add(particleshad2); | |
333 | ||
334 | TDatabasePDG *pDataBase = TDatabasePDG::Instance(); | |
335 | ||
336 | // Calculating vertex position per event | |
337 | if (fVertexSmear==kPerEvent) { | |
338 | Vertex(); | |
339 | for (i=0;i<2;i++){ | |
340 | for (j=0;j<3;j++) origin0[i][j]=fVertex[j]; | |
341 | } | |
342 | } | |
343 | else { | |
344 | for (i=0;i<2;i++){ | |
345 | for (j=0;j<3;j++) origin0[i][j]=fOrigin[j]; | |
346 | } | |
347 | } | |
348 | ||
349 | ipa = 0; | |
350 | ipa1 = 0; | |
351 | ipa0 = 0; | |
352 | ||
353 | // Generating fNpart HF-hadron pairs | |
354 | fNprimaries = 0; | |
355 | ||
356 | while (ipa<2*fNpart) { | |
357 | ||
358 | GetQuarkPair(fFile, fgIntegral, yq[0], yq[1], ptq[0], ptq[1], dphi); | |
359 | ||
360 | GetHadronPair(fFile, fQuark, yq[0], yq[1], ptq[0], ptq[1], ihadron[0], ihadron[1], plh[0], plh[1], pth[0], pth[1]); | |
361 | ||
362 | // Boost particles from c.m.s. to ALICE lab frame for p-Pb & Pb-p collisions | |
363 | if (fEnergy == 5 || fEnergy == -5 || fEnergy == 9 || fEnergy == -9) { | |
364 | Double_t dyBoost = 0.47; | |
365 | Double_t beta = TMath::TanH(dyBoost); | |
366 | Double_t gamma = 1./TMath::Sqrt((1.-beta)*(1.+beta)); | |
367 | Double_t gb = gamma * beta; | |
368 | yq[0] += dyBoost; | |
369 | yq[1] += dyBoost; | |
370 | plh[0] = gb * TMath::Sqrt(plh[0]*plh[0] + pth[0]*pth[0]) + gamma * plh[0]; | |
371 | plh[1] = gb * TMath::Sqrt(plh[1]*plh[1] + pth[1]*pth[1]) + gamma * plh[1]; | |
372 | if (fEnergy == 5 || fEnergy == 9) { | |
373 | yq[0] *= -1; | |
374 | yq[1] *= -1; | |
375 | plh[0] *= -1; | |
376 | plh[1] *= -1; | |
377 | } | |
378 | } | |
379 | ||
380 | // Cuts from AliGenerator | |
381 | ||
382 | // Cut on theta | |
383 | theta=TMath::ATan2(pth[0],plh[0]); | |
384 | if (theta<fThetaMin || theta>fThetaMax) continue; | |
385 | theta=TMath::ATan2(pth[1],plh[1]); | |
386 | if (theta<fThetaMin || theta>fThetaMax) continue; | |
387 | ||
388 | // Cut on momentum | |
389 | ph[0]=TMath::Sqrt(pth[0]*pth[0]+plh[0]*plh[0]); | |
390 | if (ph[0]<fPMin || ph[0]>fPMax) continue; | |
391 | ph[1]=TMath::Sqrt(pth[1]*pth[1]+plh[1]*plh[1]); | |
392 | if (ph[1]<fPMin || ph[1]>fPMax) continue; | |
393 | ||
394 | // Add the quarks in the stack | |
395 | ||
396 | phiq[0] = Rndm()*k2PI; | |
397 | if (Rndm() < 0.5) { | |
398 | phiq[1] = phiq[0] + dphi*kDegrad; | |
399 | } else { | |
400 | phiq[1] = phiq[0] - dphi*kDegrad; | |
401 | } | |
402 | if (phiq[1] > k2PI) phiq[1] -= k2PI; | |
403 | if (phiq[1] < 0 ) phiq[1] += k2PI; | |
404 | ||
405 | // quarks pdg | |
406 | iquark[0] = +fQuark; | |
407 | iquark[1] = -fQuark; | |
408 | ||
409 | // px and py | |
410 | TVector2 qvect1 = TVector2(); | |
411 | TVector2 qvect2 = TVector2(); | |
412 | qvect1.SetMagPhi(ptq[0],phiq[0]); | |
413 | qvect2.SetMagPhi(ptq[1],phiq[1]); | |
414 | pq[0][0] = qvect1.Px(); | |
415 | pq[0][1] = qvect1.Py(); | |
416 | pq[1][0] = qvect2.Px(); | |
417 | pq[1][1] = qvect2.Py(); | |
418 | ||
419 | // pz | |
420 | tanhy2 = TMath::TanH(yq[0]); | |
421 | tanhy2 *= tanhy2; | |
422 | pq[0][2] = TMath::Sqrt((ptq[0]*ptq[0]+qm*qm)*tanhy2/(1-tanhy2)); | |
423 | pq[0][2] = TMath::Sign((Double_t)pq[0][2],yq[0]); | |
424 | tanhy2 = TMath::TanH(yq[1]); | |
425 | tanhy2 *= tanhy2; | |
426 | pq[1][2] = TMath::Sqrt((ptq[1]*ptq[1]+qm*qm)*tanhy2/(1-tanhy2)); | |
427 | pq[1][2] = TMath::Sign((Double_t)pq[1][2],yq[1]); | |
428 | ||
429 | // Here we assume that |phi_H1 - phi_H2| = |phi_Q1 - phi_Q2| = dphi | |
430 | // which is a good approximation for heavy flavors in Pythia | |
431 | // ... moreover, same phi angles as for the quarks ... | |
432 | ||
433 | phih[0] = phiq[0]; | |
434 | phih[1] = phiq[1]; | |
435 | ||
436 | ipa1 = 0; | |
437 | ||
438 | for (ihad = 0; ihad < 2; ihad++) { | |
439 | while(1) { | |
440 | ||
441 | ipa0=ipa1; | |
442 | ||
443 | // particle type | |
444 | fChildWeight=(fDecayer->GetPartialBranchingRatio(ihadron[ihad]))*fParentWeight; | |
445 | wgtp[ihad]=fParentWeight; | |
446 | wgtch[ihad]=fChildWeight; | |
447 | TParticlePDG *particle = pDataBase->GetParticle(ihadron[ihad]); | |
448 | Float_t am = particle->Mass(); | |
449 | phi = phih[ihad]; | |
450 | pt = pth[ihad]; | |
451 | pl = plh[ihad]; | |
452 | ptot=TMath::Sqrt(pt*pt+pl*pl); | |
453 | ||
454 | p[ihad][0]=pt*TMath::Cos(phi); | |
455 | p[ihad][1]=pt*TMath::Sin(phi); | |
456 | p[ihad][2]=pl; | |
457 | ||
458 | if(fVertexSmear==kPerTrack) { | |
459 | Rndm(random,6); | |
460 | for (j=0;j<3;j++) { | |
461 | origin0[ihad][j]= | |
462 | fOrigin[j]+fOsigma[j]*TMath::Cos(2*random[2*j]*TMath::Pi())* | |
463 | TMath::Sqrt(-2*TMath::Log(random[2*j+1])); | |
464 | } | |
465 | } | |
466 | ||
467 | // Looking at fForceDecay : | |
468 | // if fForceDecay != none Primary particle decays using | |
469 | // AliPythia and children are tracked by GEANT | |
470 | // | |
471 | // if fForceDecay == none Primary particle is tracked by GEANT | |
472 | // (In the latest, make sure that GEANT actually does all the decays you want) | |
473 | ||
474 | if (fForceDecay != kNoDecay) { | |
475 | // Using lujet to decay particle | |
476 | Float_t energy=TMath::Sqrt(ptot*ptot+am*am); | |
477 | TLorentzVector pmom(p[ihad][0], p[ihad][1], p[ihad][2], energy); | |
478 | fDecayer->Decay(ihadron[ihad],&pmom); | |
479 | ||
480 | // select decay particles | |
481 | ||
482 | np[ihad]=fDecayer->ImportParticles((TClonesArray *)particleslist->At(ihad)); | |
483 | ||
484 | // Selecting GeometryAcceptance for particles fPdgCodeParticleforAcceptanceCut; | |
485 | ||
486 | if (fGeometryAcceptance) | |
487 | if (!CheckAcceptanceGeometry(np[ihad],(TClonesArray*)particleslist->At(ihad))) continue; | |
488 | ||
489 | trackIt[ihad] = new Int_t [np[ihad]]; | |
490 | pSelected[ihad] = new Int_t [np[ihad]]; | |
491 | Int_t* pFlag = new Int_t [np[ihad]]; | |
492 | ||
493 | for (i=0; i<np[ihad]; i++) { | |
494 | pFlag[i] = 0; | |
495 | pSelected[ihad][i] = 0; | |
496 | } | |
497 | ||
498 | if (np[ihad] >1) { | |
499 | TParticle* iparticle = 0; | |
500 | Int_t ipF, ipL; | |
501 | ||
502 | for (i = 1; i<np[ihad] ; i++) { | |
503 | trackIt[ihad][i] = 1; | |
504 | iparticle = | |
505 | (TParticle *) ((TClonesArray *) particleslist->At(ihad))->At(i); | |
506 | Int_t kf = iparticle->GetPdgCode(); | |
507 | Int_t ks = iparticle->GetStatusCode(); | |
508 | // flagged particle | |
509 | if (pFlag[i] == 1) { | |
510 | ipF = iparticle->GetFirstDaughter(); | |
511 | ipL = iparticle->GetLastDaughter(); | |
512 | if (ipF > 0) for (j=ipF-1; j<ipL; j++) pFlag[j]=1; | |
513 | continue; | |
514 | } | |
515 | ||
516 | // flag decay products of particles with long life-time (c tau > .3 mum) | |
517 | if (ks != 1) { | |
518 | Double_t lifeTime = fDecayer->GetLifetime(kf); | |
519 | if (lifeTime > (Double_t) fMaxLifeTime) { | |
520 | ipF = iparticle->GetFirstDaughter(); | |
521 | ipL = iparticle->GetLastDaughter(); | |
522 | if (ipF > 0) for (j=ipF-1; j<ipL; j++) pFlag[j]=1; | |
523 | } else { | |
524 | trackIt[ihad][i] = 0; | |
525 | pSelected[ihad][i] = 1; | |
526 | } | |
527 | } // ks==1 ? | |
528 | // | |
529 | // children | |
530 | if ((ChildSelected(TMath::Abs(kf)) || fForceDecay == kAll || fSelectAll) && trackIt[ihad][i]) | |
531 | { | |
532 | if (fCutOnChild) { | |
533 | pc[0]=iparticle->Px(); | |
534 | pc[1]=iparticle->Py(); | |
535 | pc[2]=iparticle->Pz(); | |
536 | //printf("px %f py %f pz %f\n",pc[0],pc[1],pc[2]); | |
537 | Bool_t childok = KinematicSelection(iparticle, 1); | |
538 | if(childok) { | |
539 | pSelected[ihad][i] = 1; | |
540 | ncsel[ihad]++; | |
541 | } else { | |
542 | ncsel[ihad]=-1; | |
543 | break; | |
544 | } // child kine cuts | |
545 | } else { | |
546 | pSelected[ihad][i] = 1; | |
547 | ncsel[ihad]++; | |
548 | } // if child selection | |
549 | } // select muon | |
550 | } // decay particle loop | |
551 | } // if decay products | |
552 | ||
553 | if ((fCutOnChild && ncsel[ihad] >0) || !fCutOnChild) ipa1++; | |
554 | ||
555 | if (pFlag) delete[] pFlag; | |
556 | ||
557 | } // kinematic selection | |
558 | else // nodecay option, so parent will be tracked by GEANT (pions, kaons, eta, omegas, baryons) | |
559 | { | |
560 | gAlice->GetMCApp()-> | |
561 | PushTrack(fTrackIt,-1,ihadron[ihad],p[ihad],origin0[ihad],polar[ihad],0,kPPrimary,nt,wgtp[ihad]); | |
562 | ipa1++; | |
563 | fNprimaries++; | |
564 | ||
565 | } | |
566 | break; | |
567 | } // while(1) loop | |
568 | if (ipa1<ipa0+1){ | |
569 | ipa1=0; | |
570 | if (pSelected[ihad]) delete pSelected[ihad]; | |
571 | if (trackIt[ihad]) delete trackIt[ihad]; | |
572 | particleshad1->Clear(); | |
573 | particleshad2->Clear(); | |
574 | break; | |
575 | }//go out of loop and generate new pair if at least one hadron is rejected | |
576 | } // hadron pair loop | |
577 | if(ipa1==2){ | |
578 | ||
579 | ipa=ipa+ipa1; | |
580 | ||
581 | if(fForceDecay != kNoDecay){ | |
582 | for(ihad=0;ihad<2;ihad++){ | |
583 | ||
584 | //load tracks in the stack if both hadrons of the pair accepted | |
585 | LoadTracks(iquark[ihad],pq[ihad],ihadron[ihad],p[ihad],np[ihad], | |
586 | (TClonesArray *)particleslist->At(ihad),origin0[ihad], | |
587 | polar[ihad],wgtp[ihad],wgtch[ihad],nt,ncsel[ihad], | |
588 | pSelected[ihad],trackIt[ihad]); | |
589 | ||
590 | if (pSelected[ihad]) delete pSelected[ihad]; | |
591 | if (trackIt[ihad]) delete trackIt[ihad]; | |
592 | ||
593 | } | |
594 | particleshad1->Clear(); | |
595 | particleshad2->Clear(); | |
596 | } | |
597 | } | |
598 | } // while (ipa<2*fNpart) loop | |
599 | ||
600 | SetHighWaterMark(nt); | |
601 | ||
602 | AliGenEventHeader* header = new AliGenEventHeader("CorrHF"); | |
603 | header->SetPrimaryVertex(fVertex); | |
604 | header->SetNProduced(fNprimaries); | |
605 | AddHeader(header); | |
606 | ||
607 | ||
608 | delete particleshad1; | |
609 | delete particleshad2; | |
610 | delete particleslist; | |
611 | ||
612 | delete[] pSelected; | |
613 | delete[] trackIt; | |
614 | } | |
615 | //____________________________________________________________________________________ | |
616 | void AliGenCorrHF::IpCharm(TH2F *hProbHH, Int_t &pdg3, Int_t &pdg4) | |
617 | { | |
618 | // Composition of a lower state charm hadron pair from a ccbar quark pair | |
619 | Int_t pdgH[] = {411, 421, 431, 4122, 4132, 4232, 4332}; | |
620 | ||
621 | Double_t id3, id4; | |
622 | hProbHH->GetRandom2(id3, id4); | |
623 | pdg3 = pdgH[(Int_t)TMath::Floor(id3)]; | |
624 | pdg4 = -1*pdgH[(Int_t)TMath::Floor(id4)]; | |
625 | ||
626 | return; | |
627 | } | |
628 | ||
629 | void AliGenCorrHF::IpBeauty(TH2F *hProbHH, Int_t &pdg3, Int_t &pdg4) | |
630 | { | |
631 | // Composition of a lower state beauty hadron pair from a bbbar quark pair | |
632 | // B-Bbar mixing will be done by Pythia at their decay point | |
633 | Int_t pdgH[] = {511, 521, 531, 5122, 5132, 5232, 5332}; | |
634 | ||
635 | Double_t id3, id4; | |
636 | hProbHH->GetRandom2(id3, id4); | |
637 | pdg3 = pdgH[(Int_t)TMath::Floor(id3)]; | |
638 | pdg4 = -1*pdgH[(Int_t)TMath::Floor(id4)]; | |
639 | ||
640 | if ( (pdg3== 511) || (pdg3== 521) || (pdg3== 531) ) pdg3 *= -1; | |
641 | if ( (pdg4==-511) || (pdg4==-521) || (pdg4==-531) ) pdg4 *= -1; | |
642 | ||
643 | return; | |
644 | } | |
645 | ||
646 | //____________________________________________________________________________________ | |
647 | Double_t AliGenCorrHF::ComputeIntegral(TFile* fG) // needed by GetQuarkPair | |
648 | { | |
649 | // Read QQbar kinematical 5D grid's cell occupancy weights | |
650 | Int_t cell[6]; // cell[6]={wght,iy1,iy2,ipt1,ipt2,idph} | |
651 | TTree* tG = (TTree*) fG->Get("tGqq"); | |
652 | tG->GetBranch("cell")->SetAddress(&cell); | |
653 | Int_t nbins = tG->GetEntries(); | |
654 | ||
655 | // delete previously computed integral (if any) | |
656 | if(fgIntegral) delete [] fgIntegral; | |
657 | ||
658 | fgIntegral = new Double_t[nbins+1]; | |
659 | fgIntegral[0] = 0; | |
660 | Int_t bin; | |
661 | for(bin=0;bin<nbins;bin++) { | |
662 | tG->GetEvent(bin); | |
663 | fgIntegral[bin+1] = fgIntegral[bin] + cell[0]; | |
664 | } | |
665 | // Normalize integral to 1 | |
666 | if (fgIntegral[nbins] == 0 ) { | |
667 | return 0; | |
668 | } | |
669 | for (bin=1;bin<=nbins;bin++) fgIntegral[bin] /= fgIntegral[nbins]; | |
670 | ||
671 | return fgIntegral[nbins]; | |
672 | } | |
673 | ||
674 | ||
675 | //____________________________________________________________________________________ | |
676 | void AliGenCorrHF::GetQuarkPair(TFile* fG, Double_t* fInt, Double_t &y1, Double_t &y2, Double_t &pt1, Double_t &pt2, Double_t &dphi) | |
677 | // modification of ROOT's TH3::GetRandom3 for 5D | |
678 | { | |
679 | // Read QQbar kinematical 5D grid's cell coordinates | |
680 | Int_t cell[6]; // cell[6]={wght,iy1,iy2,ipt1,ipt2,idph} | |
681 | TTree* tG = (TTree*) fG->Get("tGqq"); | |
682 | tG->GetBranch("cell")->SetAddress(&cell); | |
683 | Int_t nbins = tG->GetEntries(); | |
684 | Double_t rand[6]; | |
685 | gRandom->RndmArray(6,rand); | |
686 | Int_t ibin = TMath::BinarySearch(nbins,fInt,rand[0]); | |
687 | tG->GetEvent(ibin); | |
688 | y1 = fgy[cell[1]] + (fgy[cell[1]+1]-fgy[cell[1]])*rand[1]; | |
689 | y2 = fgy[cell[2]] + (fgy[cell[2]+1]-fgy[cell[2]])*rand[2]; | |
690 | pt1 = fgpt[cell[3]] + (fgpt[cell[3]+1]-fgpt[cell[3]])*rand[3]; | |
691 | pt2 = fgpt[cell[4]] + (fgpt[cell[4]+1]-fgpt[cell[4]])*rand[4]; | |
692 | dphi = fgdph[cell[5]]+ (fgdph[cell[5]+1]-fgdph[cell[5]])*rand[5]; | |
693 | } | |
694 | ||
695 | //____________________________________________________________________________________ | |
696 | 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) | |
697 | { | |
698 | // Generate a hadron pair | |
699 | void (*fIpParaFunc)(TH2F *, Int_t &, Int_t &);//Pointer to hadron pair composition function | |
700 | fIpParaFunc = IpCharm; | |
701 | Double_t mq = 1.2; // c & b quark masses (used in AliPythia) | |
702 | if (idq == 5) { | |
703 | fIpParaFunc = IpBeauty; | |
704 | mq = 4.75; | |
705 | } | |
706 | Double_t z11 = 0.; | |
707 | Double_t z12 = 0.; | |
708 | Double_t z21 = 0.; | |
709 | Double_t z22 = 0.; | |
710 | Double_t pz1, pz2, e1, e2, mh, ptemp, rand[2]; | |
711 | char tag[100]; | |
712 | TH2F *h2h[12], *h2s[12], *hProbHH; // hard & soft fragmentation and HH-probability functions | |
713 | for (Int_t ipt = 0; ipt<fgnptbins; ipt++) { | |
714 | snprintf(tag,100, "h2h_pt%d",ipt); | |
715 | h2h[ipt] = (TH2F*) fG->Get(tag); | |
716 | snprintf(tag,100, "h2s_pt%d",ipt); | |
717 | h2s[ipt] = (TH2F*) fG->Get(tag); | |
718 | } | |
719 | ||
720 | if (y1*y2 < 0) { | |
721 | for (Int_t ipt = 0; ipt<fgnptbins; ipt++) { | |
722 | if(pt1 >= fgptbmin[ipt] && pt1 < fgptbmax[ipt]) | |
723 | h2h[ipt]->GetRandom2(z11, z21); | |
724 | if(pt2 >= fgptbmin[ipt] && pt2 < fgptbmax[ipt]) | |
725 | h2h[ipt]->GetRandom2(z12, z22); | |
726 | } | |
727 | } | |
728 | else { | |
729 | if (TMath::Abs(y1) > TMath::Abs(y2)) { | |
730 | for (Int_t ipt = 0; ipt<fgnptbins; ipt++) { | |
731 | if(pt1 >= fgptbmin[ipt] && pt1 < fgptbmax[ipt]) | |
732 | h2h[ipt]->GetRandom2(z11, z21); | |
733 | if(pt2 >= fgptbmin[ipt] && pt2 < fgptbmax[ipt]) | |
734 | h2s[ipt]->GetRandom2(z12, z22); | |
735 | } | |
736 | } | |
737 | else { | |
738 | for (Int_t ipt = 0; ipt<fgnptbins; ipt++) { | |
739 | if(pt1 >= fgptbmin[ipt] && pt1 < fgptbmax[ipt]) | |
740 | h2s[ipt]->GetRandom2(z11, z21); | |
741 | if(pt2 >= fgptbmin[ipt] && pt2 < fgptbmax[ipt]) | |
742 | h2h[ipt]->GetRandom2(z12, z22); | |
743 | } | |
744 | } | |
745 | } | |
746 | gRandom->RndmArray(2,rand); | |
747 | ptemp = TMath::Sqrt(pt1*pt1 + mq*mq); | |
748 | pz1 = ptemp*TMath::SinH(y1); | |
749 | e1 = ptemp*TMath::CosH(y1); | |
750 | ptemp = TMath::Sqrt(pt2*pt2 + mq*mq); | |
751 | pz2 = ptemp*TMath::SinH(y2); | |
752 | e2 = ptemp*TMath::CosH(y2); | |
753 | ||
754 | hProbHH = (TH2F*)fG->Get("hProbHH"); | |
755 | fIpParaFunc(hProbHH, id3, id4); | |
756 | mh = TDatabasePDG::Instance()->GetParticle(id3)->Mass(); | |
757 | ptemp = z11*z21*(e1*e1-pz1*pz1) - mh*mh; | |
758 | if (idq==5) pt3 = pt1; // an approximation at low pt, try better | |
759 | else pt3 = rand[0]; // pt3=pt1 gives less D-hadrons at low pt | |
760 | if (ptemp > 0) pt3 = TMath::Sqrt(ptemp); | |
761 | if (pz1 > 0) pz3 = (z11*(e1 + pz1) - z21*(e1 - pz1)) / 2; | |
762 | else pz3 = (z21*(e1 + pz1) - z11*(e1 - pz1)) / 2; | |
763 | e1 = TMath::Sqrt(pz3*pz3 + pt3*pt3 + mh*mh); | |
764 | ||
765 | mh = TDatabasePDG::Instance()->GetParticle(id4)->Mass(); | |
766 | ptemp = z12*z22*(e2*e2-pz2*pz2) - mh*mh; | |
767 | if (idq==5) pt4 = pt2; // an approximation at low pt, try better | |
768 | else pt4 = rand[1]; | |
769 | if (ptemp > 0) pt4 = TMath::Sqrt(ptemp); | |
770 | if (pz2 > 0) pz4 = (z12*(e2 + pz2) - z22*(e2 - pz2)) / 2; | |
771 | else pz4 = (z22*(e2 + pz2) - z12*(e2 - pz2)) / 2; | |
772 | e2 = TMath::Sqrt(pz4*pz4 + pt4*pt4 + mh*mh); | |
773 | ||
774 | // small corr. instead of using Frag. Func. depending on yQ (in addition to ptQ) | |
775 | Float_t ycorr = 0.2, y3, y4; | |
776 | gRandom->RndmArray(2,rand); | |
777 | y3 = 0.5 * TMath::Log((e1 + pz3 + 1.e-13)/(e1 - pz3 + 1.e-13)); | |
778 | y4 = 0.5 * TMath::Log((e2 + pz4 + 1.e-13)/(e2 - pz4 + 1.e-13)); | |
779 | if(TMath::Abs(y3)<ycorr && TMath::Abs(y4)<ycorr && rand[0]>0.5) { | |
780 | ptemp = TMath::Sqrt((e1-pz3)*(e1+pz3)); | |
781 | y3 = 4*(1 - 2*rand[1]); | |
782 | pz3 = ptemp*TMath::SinH(y3); | |
783 | pz4 = pz3; | |
784 | } | |
785 | } | |
786 | ||
787 | ||
788 | //____________________________________________________________________________________ | |
789 | void AliGenCorrHF::LoadTracks(Int_t iquark, Float_t *pq, | |
790 | Int_t iPart, Float_t *p, | |
791 | Int_t np, TClonesArray *particles, | |
792 | Float_t *origin0, Float_t *polar, | |
793 | Float_t wgtp, Float_t wgtch, | |
794 | Int_t &nt, Int_t ncsel, Int_t *pSelected, | |
795 | Int_t *trackIt){ | |
796 | Int_t i; | |
797 | Int_t ntq=-1; | |
798 | Int_t* pParent = new Int_t[np]; | |
799 | Float_t pc[3], och[3]; | |
800 | Int_t iparent; | |
801 | ||
802 | for(i=0;i<np;i++) pParent[i]=-1; | |
803 | ||
804 | if ((fCutOnChild && ncsel >0) || !fCutOnChild){ | |
805 | // Parents | |
806 | // quark | |
807 | PushTrack(0, -1, iquark, pq, origin0, polar, 0, kPPrimary, nt, wgtp); | |
808 | KeepTrack(nt); | |
809 | ntq = nt; | |
810 | // hadron | |
811 | PushTrack(0, ntq, iPart, p, origin0, polar, 0, kPDecay, nt, wgtp); | |
812 | pParent[0] = nt; | |
813 | KeepTrack(nt); | |
814 | fNprimaries++; | |
815 | ||
816 | // Decay Products | |
817 | for (i = 1; i < np; i++) { | |
818 | if (pSelected[i]) { | |
819 | ||
820 | TParticle* iparticle = (TParticle *) particles->At(i); | |
821 | Int_t kf = iparticle->GetPdgCode(); | |
822 | Int_t jpa = iparticle->GetFirstMother()-1; | |
823 | Int_t ksc = iparticle->GetStatusCode(); | |
824 | // RS: note, the conversion mm->cm is done now in the decayer. The time is ignored here! | |
825 | och[0] = origin0[0]+iparticle->Vx(); | |
826 | och[1] = origin0[1]+iparticle->Vy(); | |
827 | och[2] = origin0[2]+iparticle->Vz(); | |
828 | pc[0] = iparticle->Px(); | |
829 | pc[1] = iparticle->Py(); | |
830 | pc[2] = iparticle->Pz(); | |
831 | ||
832 | if (jpa > -1) { | |
833 | iparent = pParent[jpa]; | |
834 | } else { | |
835 | iparent = -1; | |
836 | } | |
837 | ||
838 | PushTrack(fTrackIt*trackIt[i], iparent, kf, | |
839 | pc, och, polar, | |
840 | 0, kPDecay, nt, wgtch,ksc); | |
841 | pParent[i] = nt; | |
842 | KeepTrack(nt); | |
843 | fNprimaries++; | |
844 | ||
845 | } // Selected | |
846 | } // Particle loop | |
847 | } | |
848 | if (pParent) delete[] pParent; | |
849 | ||
850 | return; | |
851 | } |