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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, |
24 | // CTEQ5L PDF and Pt_hard = 2.76 GeV/c in p-p collisions at 10 and 14 TeV. | |
25 | // Decays are performed by Pythia. | |
2c890605 | 26 | // Author: S. Grigoryan, LPC Clermont-Fd & YerPhI, Smbat.Grigoryan@cern.ch |
b44c3901 | 27 | // July 07: added quarks in the stack (B. Vulpescu) |
b33adf51 | 28 | // April 09: added energy choice between 10 and 14 TeV (S. Grigoryan) |
2c890605 | 29 | //------------------------------------------------------------------------- |
b33adf51 | 30 | // How it works (for the given flavor and p-p energy): |
2c890605 | 31 | // |
32 | // 1) Reads QQbar kinematical grid from the Input file and generates | |
33 | // quark pairs according to the weights of the cells. | |
34 | // It is a 5D grid in y1,y2,pt1,pt2 and deltaphi, with occupancy weights | |
35 | // of the cells obtained from Pythia (see details in GetQuarkPair). | |
36 | // 2) Reads "soft" and "hard" fragmentation functions (12 2D-histograms each, | |
37 | // for 12 pt bins) from the Input file, applies to quarks and produces hadrons | |
38 | // (only lower states, with proportions of species obtained from Pythia). | |
39 | // Fragmentation functions are the same for all hadron species and depend | |
40 | // on 2 variables - light cone energy-momentum fractions: | |
41 | // z1=(E_H + Pz_H)/(E_Q + Pz_Q), z2=(E_H - Pz_H)/(E_Q - Pz_Q). | |
42 | // "soft" & "hard" FFs correspond to "slower" & "faster" quark of a pair | |
b33adf51 | 43 | // (see details in GetHadronPair). Fragmentation does not depend on p-p energy. |
2c890605 | 44 | // 3) Decays the hadrons and saves all the particles in the event stack in the |
45 | // following order: HF hadron from Q, then its decay products, then HF hadron | |
46 | // from Qbar, then its decay productes, then next HF hadon pair (if any) | |
47 | // in the same way, etc... | |
48 | // 4) It is fast, e.g., generates the same number of events with a beauty pair | |
49 | // ~15 times faster than AliGenPythia with kBeautyppMNRwmi (w/o tracking) | |
50 | // | |
b33adf51 | 51 | // An Input file for each quark flavor and p-p energy is in EVGEN/dataCorrHF/ |
2c890605 | 52 | // One can use also user-defined Input files. |
53 | // | |
54 | // More details could be found in my presentation at DiMuonNet Workshop, Dec 2006: | |
b33adf51 | 55 | // http://www-dapnia.cea.fr/Sphn/Alice/DiMuonNet. |
2c890605 | 56 | // |
57 | //------------------------------------------------------------------------- | |
58 | // How to use it: | |
59 | // | |
60 | // add the following typical lines in Config.C | |
61 | /* | |
62 | if (!strcmp(option,"corr")) { | |
b33adf51 | 63 | // Example for correlated charm or beauty hadron pair production at 14 TeV |
2c890605 | 64 | |
b33adf51 | 65 | // AliGenCorrHF *gener = new AliGenCorrHF(1, 4, 14); // for charm, 1 pair per event |
66 | AliGenCorrHF *gener = new AliGenCorrHF(1, 5, 14); // for beauty, 1 pair per event | |
2c890605 | 67 | |
68 | gener->SetMomentumRange(0,9999); | |
69 | gener->SetCutOnChild(0); // 1/0 means cuts on children enable/disable | |
70 | gener->SetChildThetaRange(171.0,178.0); | |
71 | gener->SetOrigin(0,0,0); //vertex position | |
72 | gener->SetSigma(0,0,0); //Sigma in (X,Y,Z) (cm) on IP position | |
73 | gener->SetForceDecay(kSemiMuonic); | |
74 | gener->SetTrackingFlag(0); | |
75 | gener->Init(); | |
76 | } | |
77 | */ | |
78 | // and in aliroot do e.g. gAlice->Run(10,"Config.C") to produce 10 events. | |
79 | // One can include AliGenCorrHF in an AliGenCocktail generator. | |
80 | //-------------------------------------------------------------------------- | |
81 | ||
7ca4655f | 82 | #include <Riostream.h> |
83 | #include <TCanvas.h> | |
84 | #include <TClonesArray.h> | |
85 | #include <TDatabasePDG.h> | |
2c890605 | 86 | #include <TFile.h> |
2c890605 | 87 | #include <TH2F.h> |
2c890605 | 88 | #include <TLorentzVector.h> |
7ca4655f | 89 | #include <TMath.h> |
2c890605 | 90 | #include <TParticle.h> |
91 | #include <TParticlePDG.h> | |
7ca4655f | 92 | #include <TROOT.h> |
93 | #include <TRandom.h> | |
94 | #include <TTree.h> | |
2c890605 | 95 | #include <TVirtualMC.h> |
b44c3901 | 96 | #include <TVector3.h> |
2c890605 | 97 | |
98 | #include "AliGenCorrHF.h" | |
99 | #include "AliLog.h" | |
100 | #include "AliConst.h" | |
101 | #include "AliDecayer.h" | |
102 | #include "AliMC.h" | |
103 | #include "AliRun.h" | |
84555c93 | 104 | #include "AliGenEventHeader.h" |
2c890605 | 105 | |
106 | ClassImp(AliGenCorrHF) | |
107 | ||
108 | //Begin_Html | |
109 | /* | |
110 | <img src="picts/AliGenCorrHF.gif"> | |
111 | */ | |
112 | //End_Html | |
113 | ||
114 | Double_t AliGenCorrHF::fgdph[19] = {0, 10, 20, 30, 40, 50, 60, 70, 80, 90, 100, 110, 120, 130, 140, 150, 160, 170, 180}; | |
115 | 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 | 116 | 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 | 117 | Int_t AliGenCorrHF::fgnptbins = 12; |
118 | Double_t AliGenCorrHF::fgptbmin[12] = {0, 0.5, 1, 1.5, 2, 2.5, 3, 4, 5, 6, 7, 9}; | |
119 | Double_t AliGenCorrHF::fgptbmax[12] = {0.5, 1, 1.5, 2, 2.5, 3, 4, 5, 6, 7, 9, 100}; | |
120 | ||
121 | Double_t* AliGenCorrHF::fgIntegral = 0; | |
122 | ||
123 | //____________________________________________________________ | |
124 | AliGenCorrHF::AliGenCorrHF(): | |
125 | fFileName(0), | |
126 | fFile(0), | |
127 | fQuark(0), | |
b33adf51 | 128 | fEnergy(0), |
2c890605 | 129 | fBias(0.), |
130 | fTrials(0), | |
131 | fDecayer(0) | |
132 | { | |
133 | // Default constructor | |
134 | } | |
135 | ||
136 | //____________________________________________________________ | |
b33adf51 | 137 | AliGenCorrHF::AliGenCorrHF(Int_t npart, Int_t idquark, Int_t energy): |
2c890605 | 138 | AliGenMC(npart), |
139 | fFileName(0), | |
140 | fFile(0), | |
b33adf51 | 141 | fQuark(idquark), |
142 | fEnergy(energy), | |
2c890605 | 143 | fBias(0.), |
144 | fTrials(0), | |
145 | // fDecayer(new AliDecayerPythia()) | |
146 | fDecayer(0) | |
147 | { | |
b33adf51 | 148 | // Constructor using particle number, quark type, energy & default InputFile |
2c890605 | 149 | // |
b33adf51 | 150 | if (fQuark == 5) { |
151 | if (fEnergy == 10) | |
152 | fFileName = "$ALICE_ROOT/EVGEN/dataCorrHF/Beautypp10MNRwmiCorr.root"; | |
153 | else fFileName = "$ALICE_ROOT/EVGEN/dataCorrHF/Beautypp14MNRwmiCorr.root"; | |
154 | } | |
155 | else { | |
156 | fQuark = 4; | |
157 | if (fEnergy == 10) | |
158 | fFileName = "$ALICE_ROOT/EVGEN/dataCorrHF/Charmpp10MNRwmiCorr.root"; | |
159 | else fFileName = "$ALICE_ROOT/EVGEN/dataCorrHF/Charmpp14MNRwmiCorr.root"; | |
160 | } | |
2c890605 | 161 | fName = "Default"; |
162 | fTitle= "Generator for correlated pairs of HF hadrons"; | |
163 | ||
164 | fChildSelect.Set(5); | |
165 | for (Int_t i=0; i<5; i++) fChildSelect[i]=0; | |
166 | SetForceDecay(); | |
167 | SetCutOnChild(); | |
168 | SetChildMomentumRange(); | |
169 | SetChildPtRange(); | |
170 | SetChildPhiRange(); | |
171 | SetChildThetaRange(); | |
172 | } | |
173 | ||
174 | //___________________________________________________________________ | |
b33adf51 | 175 | AliGenCorrHF::AliGenCorrHF(char* tname, Int_t npart, Int_t idquark, Int_t energy): |
2c890605 | 176 | AliGenMC(npart), |
177 | fFileName(tname), | |
178 | fFile(0), | |
b33adf51 | 179 | fQuark(idquark), |
180 | fEnergy(energy), | |
2c890605 | 181 | fBias(0.), |
182 | fTrials(0), | |
183 | // fDecayer(new AliDecayerPythia()) | |
184 | fDecayer(0) | |
185 | { | |
b33adf51 | 186 | // Constructor using particle number, quark type, energy & user-defined InputFile |
2c890605 | 187 | // |
188 | if (fQuark != 5) fQuark = 4; | |
189 | fName = "UserDefined"; | |
190 | fTitle= "Generator for correlated pairs of HF hadrons"; | |
191 | ||
192 | fChildSelect.Set(5); | |
193 | for (Int_t i=0; i<5; i++) fChildSelect[i]=0; | |
194 | SetForceDecay(); | |
195 | SetCutOnChild(); | |
196 | SetChildMomentumRange(); | |
197 | SetChildPtRange(); | |
198 | SetChildPhiRange(); | |
199 | SetChildThetaRange(); | |
200 | } | |
201 | ||
2c890605 | 202 | //____________________________________________________________ |
203 | AliGenCorrHF::~AliGenCorrHF() | |
204 | { | |
205 | // Destructor | |
206 | delete fFile; | |
207 | } | |
208 | ||
209 | //____________________________________________________________ | |
210 | void AliGenCorrHF::Init() | |
211 | { | |
212 | // Initialisation | |
213 | ||
214 | AliInfo(Form(" QQbar kinematics and fragm. functions from: %s",fFileName.Data() )); | |
215 | fFile = TFile::Open(fFileName.Data()); | |
216 | if(!fFile->IsOpen()){ | |
217 | AliError(Form("Could not open file %s",fFileName.Data() )); | |
218 | } | |
219 | ||
220 | ComputeIntegral(fFile); | |
b44c3901 | 221 | |
2c890605 | 222 | fParentWeight = 1./fNpart; // fNpart is number of HF-hadron pairs |
223 | ||
224 | // particle decay related initialization | |
225 | ||
226 | if (gMC) fDecayer = gMC->GetDecayer(); | |
227 | fDecayer->SetForceDecay(fForceDecay); | |
228 | fDecayer->Init(); | |
229 | ||
230 | // | |
231 | AliGenMC::Init(); | |
232 | } | |
2c890605 | 233 | //____________________________________________________________ |
234 | void AliGenCorrHF::Generate() | |
235 | { | |
236 | // | |
cb11fd27 | 237 | // Generate fNpart of correlated HF hadron pairs per event |
238 | // in the the desired theta and momentum windows (phi = 0 - 2pi). | |
84555c93 | 239 | // |
cb11fd27 | 240 | |
84555c93 | 241 | // Reinitialize decayer |
2c890605 | 242 | |
84555c93 | 243 | fDecayer->SetForceDecay(fForceDecay); |
244 | fDecayer->Init(); | |
245 | ||
246 | // | |
2c890605 | 247 | Float_t polar[3]= {0,0,0}; // Polarisation of the parent particle (for GEANT tracking) |
248 | Float_t origin0[3]; // Origin of the generated parent particle (for GEANT tracking) | |
249 | Float_t pt, pl, ptot; // Transverse, logitudinal and total momenta of the parent particle | |
250 | Float_t phi, theta; // Phi and theta spherical angles of the parent particle momentum | |
251 | Float_t p[3], pc[3], och[3];// Momentum, polarisation and origin of the children particles from lujet | |
84555c93 | 252 | Int_t nt, i, j, ipa, ihadron[2], iquark[2]; |
253 | Float_t wgtp, wgtch, random[6]; | |
254 | Float_t pq[2][3]; // Momenta of the two quarks | |
255 | Int_t ntq[2] = {-1, -1}; | |
cb11fd27 | 256 | Double_t tanhy2, qm = 0; |
2c890605 | 257 | |
b44c3901 | 258 | Double_t dphi=0, ptq[2], yq[2], pth[2], plh[2], ph[2], phih[2], phiq[2]; |
2c890605 | 259 | for (i=0; i<2; i++) { |
b44c3901 | 260 | ptq[i] =0; |
261 | yq[i] =0; | |
262 | pth[i] =0; | |
263 | plh[i] =0; | |
264 | phih[i] =0; | |
265 | phiq[i] =0; | |
2c890605 | 266 | ihadron[i] =0; |
84555c93 | 267 | iquark[i] =0; |
2c890605 | 268 | } |
269 | ||
cb11fd27 | 270 | // same quarks mass as in the fragmentation functions |
271 | if (fQuark == 4) qm = 1.20; | |
272 | else qm = 4.75; | |
273 | ||
2c890605 | 274 | static TClonesArray *particles; |
275 | // | |
276 | if(!particles) particles = new TClonesArray("TParticle",1000); | |
277 | ||
84555c93 | 278 | TDatabasePDG *pDataBase = TDatabasePDG::Instance(); |
279 | // | |
280 | ||
281 | // Calculating vertex position per event | |
2c890605 | 282 | for (j=0;j<3;j++) origin0[j]=fOrigin[j]; |
b33adf51 | 283 | if (fVertexSmear==kPerEvent) { |
84555c93 | 284 | Vertex(); |
285 | for (j=0;j<3;j++) origin0[j]=fVertex[j]; | |
2c890605 | 286 | } |
287 | ||
84555c93 | 288 | ipa=0; |
289 | ||
290 | // Generating fNpart particles | |
291 | fNprimaries = 0; | |
292 | ||
293 | while (ipa<2*fNpart) { | |
294 | ||
295 | GetQuarkPair(fFile, fgIntegral, yq[0], yq[1], ptq[0], ptq[1], dphi); | |
296 | ||
297 | GetHadronPair(fFile, fQuark, yq[0], yq[1], ptq[0], ptq[1], ihadron[0], ihadron[1], plh[0], plh[1], pth[0], pth[1]); | |
298 | ||
299 | // Cuts from AliGenerator | |
300 | ||
301 | // Cut on theta | |
302 | theta=TMath::ATan2(pth[0],plh[0]); | |
b33adf51 | 303 | if (theta<fThetaMin || theta>fThetaMax) continue; |
84555c93 | 304 | theta=TMath::ATan2(pth[1],plh[1]); |
b33adf51 | 305 | if (theta<fThetaMin || theta>fThetaMax) continue; |
84555c93 | 306 | |
307 | // Cut on momentum | |
308 | ph[0]=TMath::Sqrt(pth[0]*pth[0]+plh[0]*plh[0]); | |
309 | if (ph[0]<fPMin || ph[0]>fPMax) continue; | |
310 | ph[1]=TMath::Sqrt(pth[1]*pth[1]+plh[1]*plh[1]); | |
311 | if (ph[1]<fPMin || ph[1]>fPMax) continue; | |
312 | ||
313 | // Add the quarks in the stack | |
314 | ||
315 | phiq[0] = Rndm()*k2PI; | |
316 | if (Rndm() < 0.5) { | |
b44c3901 | 317 | phiq[1] = phiq[0] + dphi*kDegrad; |
84555c93 | 318 | } else { |
319 | phiq[1] = phiq[0] - dphi*kDegrad; | |
320 | } | |
321 | if (phiq[1] > k2PI) phiq[1] -= k2PI; | |
322 | if (phiq[1] < 0 ) phiq[1] += k2PI; | |
323 | ||
324 | // quarks pdg | |
325 | iquark[0] = +fQuark; | |
326 | iquark[1] = -fQuark; | |
327 | ||
328 | // px and py | |
329 | TVector2 qvect1 = TVector2(); | |
330 | TVector2 qvect2 = TVector2(); | |
331 | qvect1.SetMagPhi(ptq[0],phiq[0]); | |
332 | qvect2.SetMagPhi(ptq[1],phiq[1]); | |
333 | pq[0][0] = qvect1.Px(); | |
334 | pq[0][1] = qvect1.Py(); | |
335 | pq[1][0] = qvect2.Px(); | |
336 | pq[1][1] = qvect2.Py(); | |
337 | ||
338 | // pz | |
cb11fd27 | 339 | tanhy2 = TMath::TanH(yq[0]); |
340 | tanhy2 *= tanhy2; | |
341 | pq[0][2] = TMath::Sqrt((ptq[0]*ptq[0]+qm*qm)*tanhy2/(1-tanhy2)); | |
342 | pq[0][2] = TMath::Sign((Double_t)pq[0][2],yq[0]); | |
343 | tanhy2 = TMath::TanH(yq[1]); | |
344 | tanhy2 *= tanhy2; | |
345 | pq[1][2] = TMath::Sqrt((ptq[1]*ptq[1]+qm*qm)*tanhy2/(1-tanhy2)); | |
346 | pq[1][2] = TMath::Sign((Double_t)pq[1][2],yq[1]); | |
84555c93 | 347 | |
348 | // Here we assume that |phi_H1 - phi_H2| = |phi_Q1 - phi_Q2| = dphi | |
349 | // which is a good approximation for heavy flavors in Pythia | |
350 | // ... moreover, same phi angles as for the quarks ... | |
351 | ||
352 | phih[0] = phiq[0]; | |
353 | phih[1] = phiq[1]; | |
b44c3901 | 354 | |
84555c93 | 355 | for (Int_t ihad = 0; ihad < 2; ihad++) { |
356 | while(1) { | |
357 | // | |
358 | // particle type | |
359 | Int_t iPart = ihadron[ihad]; | |
360 | fChildWeight=(fDecayer->GetPartialBranchingRatio(iPart))*fParentWeight; | |
361 | wgtp=fParentWeight; | |
362 | wgtch=fChildWeight; | |
363 | TParticlePDG *particle = pDataBase->GetParticle(iPart); | |
364 | Float_t am = particle->Mass(); | |
365 | phi = phih[ihad]; | |
366 | pt = pth[ihad]; | |
367 | pl = plh[ihad]; | |
368 | ptot=TMath::Sqrt(pt*pt+pl*pl); | |
369 | ||
370 | p[0]=pt*TMath::Cos(phi); | |
371 | p[1]=pt*TMath::Sin(phi); | |
372 | p[2]=pl; | |
b44c3901 | 373 | |
2c890605 | 374 | if(fVertexSmear==kPerTrack) { |
84555c93 | 375 | Rndm(random,6); |
376 | for (j=0;j<3;j++) { | |
377 | origin0[j]= | |
378 | fOrigin[j]+fOsigma[j]*TMath::Cos(2*random[2*j]*TMath::Pi())* | |
379 | TMath::Sqrt(-2*TMath::Log(random[2*j+1])); | |
2c890605 | 380 | } |
381 | } | |
84555c93 | 382 | |
383 | // Looking at fForceDecay : | |
384 | // if fForceDecay != none Primary particle decays using | |
385 | // AliPythia and children are tracked by GEANT | |
386 | // | |
387 | // if fForceDecay == none Primary particle is tracked by GEANT | |
388 | // (In the latest, make sure that GEANT actually does all the decays you want) | |
389 | // | |
390 | ||
391 | if (fForceDecay != kNoDecay) { | |
392 | // Using lujet to decay particle | |
393 | Float_t energy=TMath::Sqrt(ptot*ptot+am*am); | |
394 | TLorentzVector pmom(p[0], p[1], p[2], energy); | |
395 | fDecayer->Decay(iPart,&pmom); | |
396 | // | |
397 | // select decay particles | |
398 | Int_t np=fDecayer->ImportParticles(particles); | |
399 | ||
400 | // Selecting GeometryAcceptance for particles fPdgCodeParticleforAcceptanceCut; | |
401 | if (fGeometryAcceptance) | |
402 | if (!CheckAcceptanceGeometry(np,particles)) continue; | |
403 | Int_t ncsel=0; | |
404 | Int_t* pFlag = new Int_t[np]; | |
405 | Int_t* pParent = new Int_t[np]; | |
406 | Int_t* pSelected = new Int_t[np]; | |
407 | Int_t* trackIt = new Int_t[np]; | |
408 | ||
409 | for (i=0; i<np; i++) { | |
410 | pFlag[i] = 0; | |
411 | pSelected[i] = 0; | |
412 | pParent[i] = -1; | |
413 | } | |
414 | ||
415 | if (np >1) { | |
416 | TParticle* iparticle = (TParticle *) particles->At(0); | |
417 | Int_t ipF, ipL; | |
418 | for (i = 1; i<np ; i++) { | |
419 | trackIt[i] = 1; | |
420 | iparticle = (TParticle *) particles->At(i); | |
421 | Int_t kf = iparticle->GetPdgCode(); | |
422 | Int_t ks = iparticle->GetStatusCode(); | |
423 | // flagged particle | |
424 | ||
425 | if (pFlag[i] == 1) { | |
426 | ipF = iparticle->GetFirstDaughter(); | |
427 | ipL = iparticle->GetLastDaughter(); | |
428 | if (ipF > 0) for (j=ipF-1; j<ipL; j++) pFlag[j]=1; | |
429 | continue; | |
430 | } | |
431 | ||
432 | // flag decay products of particles with long life-time (c tau > .3 mum) | |
433 | ||
434 | if (ks != 1) { | |
435 | //TParticlePDG *particle = pDataBase->GetParticle(kf); | |
436 | ||
437 | Double_t lifeTime = fDecayer->GetLifetime(kf); | |
438 | //Double_t mass = particle->Mass(); | |
439 | //Double_t width = particle->Width(); | |
440 | if (lifeTime > (Double_t) fMaxLifeTime) { | |
441 | ipF = iparticle->GetFirstDaughter(); | |
442 | ipL = iparticle->GetLastDaughter(); | |
443 | if (ipF > 0) for (j=ipF-1; j<ipL; j++) pFlag[j]=1; | |
b33adf51 | 444 | } else { |
84555c93 | 445 | trackIt[i] = 0; |
446 | pSelected[i] = 1; | |
2c890605 | 447 | } |
84555c93 | 448 | } // ks==1 ? |
449 | // | |
450 | // children | |
451 | ||
f7b22746 | 452 | if ((ChildSelected(TMath::Abs(kf)) || fForceDecay == kAll) && trackIt[i]) |
84555c93 | 453 | { |
454 | if (fCutOnChild) { | |
455 | pc[0]=iparticle->Px(); | |
456 | pc[1]=iparticle->Py(); | |
457 | pc[2]=iparticle->Pz(); | |
458 | Bool_t childok = KinematicSelection(iparticle, 1); | |
459 | if(childok) { | |
460 | pSelected[i] = 1; | |
461 | ncsel++; | |
462 | } else { | |
463 | ncsel=-1; | |
464 | break; | |
465 | } // child kine cuts | |
466 | } else { | |
467 | pSelected[i] = 1; | |
468 | ncsel++; | |
469 | } // if child selection | |
470 | } // select muon | |
471 | } // decay particle loop | |
472 | } // if decay products | |
473 | ||
474 | Int_t iparent; | |
475 | if ((fCutOnChild && ncsel >0) || !fCutOnChild){ | |
476 | ipa++; | |
477 | // | |
478 | // Parent | |
479 | // quark | |
480 | PushTrack(0, -1, iquark[ihad], pq[ihad], origin0, polar, 0, kPPrimary, nt, wgtp); | |
481 | KeepTrack(nt); | |
482 | ntq[ihad] = nt; | |
84555c93 | 483 | // hadron |
484 | PushTrack(0, ntq[ihad], iPart, p, origin0, polar, 0, kPDecay, nt, wgtp); | |
485 | pParent[0] = nt; | |
486 | KeepTrack(nt); | |
487 | fNprimaries++; | |
84555c93 | 488 | |
489 | // | |
490 | // Decay Products | |
491 | // | |
492 | for (i = 1; i < np; i++) { | |
493 | if (pSelected[i]) { | |
494 | TParticle* iparticle = (TParticle *) particles->At(i); | |
495 | Int_t kf = iparticle->GetPdgCode(); | |
7f11c778 | 496 | Int_t jpa = iparticle->GetFirstMother()-1; |
2c890605 | 497 | |
84555c93 | 498 | och[0] = origin0[0]+iparticle->Vx()/10; |
499 | och[1] = origin0[1]+iparticle->Vy()/10; | |
500 | och[2] = origin0[2]+iparticle->Vz()/10; | |
501 | pc[0] = iparticle->Px(); | |
502 | pc[1] = iparticle->Py(); | |
503 | pc[2] = iparticle->Pz(); | |
2c890605 | 504 | |
7f11c778 | 505 | if (jpa > -1) { |
506 | iparent = pParent[jpa]; | |
84555c93 | 507 | } else { |
508 | iparent = -1; | |
509 | } | |
510 | ||
511 | PushTrack(fTrackIt*trackIt[i], iparent, kf, | |
512 | pc, och, polar, | |
513 | 0, kPDecay, nt, wgtch); | |
84555c93 | 514 | pParent[i] = nt; |
515 | KeepTrack(nt); | |
516 | fNprimaries++; | |
517 | } // Selected | |
518 | } // Particle loop | |
519 | } // Decays by Lujet | |
520 | particles->Clear(); | |
521 | if (pFlag) delete[] pFlag; | |
522 | if (pParent) delete[] pParent; | |
523 | if (pSelected) delete[] pSelected; | |
524 | if (trackIt) delete[] trackIt; | |
525 | } // kinematic selection | |
526 | else // nodecay option, so parent will be tracked by GEANT (pions, kaons, eta, omegas, baryons) | |
527 | { | |
528 | gAlice->GetMCApp()-> | |
529 | PushTrack(fTrackIt,-1,iPart,p,origin0,polar,0,kPPrimary,nt,wgtp); | |
530 | ipa++; | |
531 | fNprimaries++; | |
532 | } | |
2c890605 | 533 | break; |
534 | } // while(1) | |
84555c93 | 535 | } // hadron pair loop |
536 | } // event loop | |
537 | ||
2c890605 | 538 | SetHighWaterMark(nt); |
84555c93 | 539 | |
cb11fd27 | 540 | AliGenEventHeader* header = new AliGenEventHeader("CorrHF"); |
84555c93 | 541 | header->SetPrimaryVertex(fVertex); |
542 | header->SetNProduced(fNprimaries); | |
543 | AddHeader(header); | |
2c890605 | 544 | |
84555c93 | 545 | } |
2c890605 | 546 | //____________________________________________________________________________________ |
547 | Int_t AliGenCorrHF::IpCharm(TRandom* ran) | |
548 | { | |
549 | // Composition of lower state charm hadrons, containing a c-quark | |
550 | Float_t random; | |
551 | Int_t ip; // +- 411,421,431,4122,4132,4232,4332 | |
552 | random = ran->Rndm(); | |
553 | // Rates from Pythia6.214 using 100Kevents with kPyCharmppMNRwmi at 14 TeV. | |
554 | ||
555 | if (random < 0.6027) { | |
556 | ip=421; | |
557 | } else if (random < 0.7962) { | |
558 | ip=411; | |
559 | } else if (random < 0.9127) { | |
560 | ip=431; | |
561 | } else if (random < 0.9899) { | |
562 | ip=4122; | |
563 | } else if (random < 0.9948) { | |
564 | ip=4132; | |
565 | } else if (random < 0.9999) { | |
566 | ip=4232; | |
567 | } else { | |
568 | ip=4332; | |
569 | } | |
570 | ||
571 | return ip; | |
572 | } | |
573 | ||
574 | Int_t AliGenCorrHF::IpBeauty(TRandom* ran) | |
575 | { | |
576 | // Composition of lower state beauty hadrons, containing a b-quark | |
577 | Float_t random; | |
578 | Int_t ip; // +- 511,521,531,5122,5132,5232,5332 | |
579 | random = ran->Rndm(); | |
580 | // Rates from Pythia6.214 using 100Kevents with kPyBeautyppMNRwmi at 14 TeV. | |
581 | // B-Bbar mixing will be done by Pythia at the decay point | |
582 | if (random < 0.3965) { | |
583 | ip=-511; | |
584 | } else if (random < 0.7930) { | |
585 | ip=-521; | |
586 | } else if (random < 0.9112) { | |
587 | ip=-531; | |
588 | } else if (random < 0.9887) { | |
589 | ip=5122; | |
590 | } else if (random < 0.9943) { | |
591 | ip=5132; | |
592 | } else if (random < 0.9999) { | |
593 | ip=5232; | |
594 | } else { | |
595 | ip=5332; | |
596 | } | |
597 | ||
598 | return ip; | |
599 | } | |
600 | ||
601 | //____________________________________________________________________________________ | |
602 | Double_t AliGenCorrHF::ComputeIntegral(TFile* fG) // needed by GetQuarkPair | |
603 | { | |
604 | // Read QQbar kinematical 5D grid's cell occupancy weights | |
4c111067 | 605 | Int_t cell[6]; // cell[6]={wght,iy1,iy2,ipt1,ipt2,idph} |
2c890605 | 606 | TTree* tG = (TTree*) fG->Get("tGqq"); |
4c111067 | 607 | tG->GetBranch("cell")->SetAddress(&cell); |
2c890605 | 608 | Int_t nbins = tG->GetEntries(); |
609 | ||
610 | // delete previously computed integral (if any) | |
611 | if(fgIntegral) delete [] fgIntegral; | |
612 | ||
613 | fgIntegral = new Double_t[nbins+1]; | |
614 | fgIntegral[0] = 0; | |
615 | Int_t bin; | |
616 | for(bin=0;bin<nbins;bin++) { | |
617 | tG->GetEvent(bin); | |
618 | fgIntegral[bin+1] = fgIntegral[bin] + cell[0]; | |
619 | } | |
620 | // Normalize integral to 1 | |
621 | if (fgIntegral[nbins] == 0 ) { | |
622 | return 0; | |
623 | } | |
624 | for (bin=1;bin<=nbins;bin++) fgIntegral[bin] /= fgIntegral[nbins]; | |
625 | ||
626 | return fgIntegral[nbins]; | |
627 | } | |
628 | ||
629 | //____________________________________________________________________________________ | |
630 | void AliGenCorrHF::GetQuarkPair(TFile* fG, Double_t* fInt, Double_t &y1, Double_t &y2, Double_t &pt1, Double_t &pt2, Double_t &dphi) | |
631 | // modification of ROOT's TH3::GetRandom3 for 5D | |
632 | { | |
633 | // Read QQbar kinematical 5D grid's cell coordinates | |
4c111067 | 634 | Int_t cell[6]; // cell[6]={wght,iy1,iy2,ipt1,ipt2,idph} |
2c890605 | 635 | TTree* tG = (TTree*) fG->Get("tGqq"); |
4c111067 | 636 | tG->GetBranch("cell")->SetAddress(&cell); |
2c890605 | 637 | Int_t nbins = tG->GetEntries(); |
638 | Double_t rand[6]; | |
639 | gRandom->RndmArray(6,rand); | |
640 | Int_t ibin = TMath::BinarySearch(nbins,fInt,rand[0]); | |
641 | tG->GetEvent(ibin); | |
642 | y1 = fgy[cell[1]] + (fgy[cell[1]+1]-fgy[cell[1]])*rand[1]; | |
643 | y2 = fgy[cell[2]] + (fgy[cell[2]+1]-fgy[cell[2]])*rand[2]; | |
644 | pt1 = fgpt[cell[3]] + (fgpt[cell[3]+1]-fgpt[cell[3]])*rand[3]; | |
645 | pt2 = fgpt[cell[4]] + (fgpt[cell[4]+1]-fgpt[cell[4]])*rand[4]; | |
646 | dphi = fgdph[cell[5]]+ (fgdph[cell[5]+1]-fgdph[cell[5]])*rand[5]; | |
647 | } | |
648 | ||
649 | //____________________________________________________________________________________ | |
650 | 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) | |
651 | { | |
652 | // Generate a hadron pair | |
653 | Int_t (*fIpParaFunc )(TRandom*);//Pointer to particle type parametrisation function | |
654 | fIpParaFunc = IpCharm; | |
655 | Double_t mq = 1.2; // c & b quark masses (used in AliPythia) | |
656 | if (idq == 5) { | |
657 | fIpParaFunc = IpBeauty; | |
658 | mq = 4.75; | |
659 | } | |
660 | Double_t z11, z12, z21, z22, pz1, pz2, e1, e2, mh, ptemp, rand[2]; | |
661 | char tag[100]; | |
662 | TH2F *h2h[12], *h2s[12]; // hard & soft Fragmentation Functions | |
663 | for (Int_t ipt = 0; ipt<fgnptbins; ipt++) { | |
664 | sprintf(tag,"h2h_pt%d",ipt); | |
665 | h2h[ipt] = (TH2F*) fG->Get(tag); | |
666 | sprintf(tag,"h2s_pt%d",ipt); | |
667 | h2s[ipt] = (TH2F*) fG->Get(tag); | |
668 | } | |
669 | ||
670 | if (y1*y2 < 0) { | |
671 | for (Int_t ipt = 0; ipt<fgnptbins; ipt++) { | |
672 | if(pt1 >= fgptbmin[ipt] && pt1 < fgptbmax[ipt]) | |
673 | h2h[ipt]->GetRandom2(z11, z21); | |
674 | if(pt2 >= fgptbmin[ipt] && pt2 < fgptbmax[ipt]) | |
675 | h2h[ipt]->GetRandom2(z12, z22); | |
676 | } | |
677 | } | |
678 | else { | |
679 | if (TMath::Abs(y1) > TMath::Abs(y2)) { | |
680 | for (Int_t ipt = 0; ipt<fgnptbins; ipt++) { | |
681 | if(pt1 >= fgptbmin[ipt] && pt1 < fgptbmax[ipt]) | |
682 | h2h[ipt]->GetRandom2(z11, z21); | |
683 | if(pt2 >= fgptbmin[ipt] && pt2 < fgptbmax[ipt]) | |
684 | h2s[ipt]->GetRandom2(z12, z22); | |
685 | } | |
686 | } | |
687 | else { | |
688 | for (Int_t ipt = 0; ipt<fgnptbins; ipt++) { | |
689 | if(pt1 >= fgptbmin[ipt] && pt1 < fgptbmax[ipt]) | |
690 | h2s[ipt]->GetRandom2(z11, z21); | |
691 | if(pt2 >= fgptbmin[ipt] && pt2 < fgptbmax[ipt]) | |
692 | h2h[ipt]->GetRandom2(z12, z22); | |
693 | } | |
694 | } | |
695 | } | |
696 | gRandom->RndmArray(2,rand); | |
697 | ptemp = TMath::Sqrt(pt1*pt1 + mq*mq); | |
698 | pz1 = ptemp*TMath::SinH(y1); | |
699 | e1 = ptemp*TMath::CosH(y1); | |
700 | ptemp = TMath::Sqrt(pt2*pt2 + mq*mq); | |
701 | pz2 = ptemp*TMath::SinH(y2); | |
702 | e2 = ptemp*TMath::CosH(y2); | |
703 | ||
704 | id3 = fIpParaFunc(gRandom); | |
705 | mh = TDatabasePDG::Instance()->GetParticle(id3)->Mass(); | |
706 | ptemp = z11*z21*(e1*e1-pz1*pz1) - mh*mh; | |
b33adf51 | 707 | if (idq==5) pt3 = pt1; // an approximation at low pt, try better |
708 | else pt3 = rand[0]; | |
2c890605 | 709 | if (ptemp > 0) pt3 = TMath::Sqrt(ptemp); |
710 | if (pz1 > 0) pz3 = (z11*(e1 + pz1) - z21*(e1 - pz1)) / 2; | |
711 | else pz3 = (z21*(e1 + pz1) - z11*(e1 - pz1)) / 2; | |
712 | e1 = TMath::Sqrt(pz3*pz3 + pt3*pt3 + mh*mh); | |
713 | ||
714 | id4 = - fIpParaFunc(gRandom); | |
715 | mh = TDatabasePDG::Instance()->GetParticle(id4)->Mass(); | |
716 | ptemp = z12*z22*(e2*e2-pz2*pz2) - mh*mh; | |
b33adf51 | 717 | if (idq==5) pt4 = pt2; // an approximation at low pt, try better |
718 | else pt4 = rand[1]; | |
2c890605 | 719 | if (ptemp > 0) pt4 = TMath::Sqrt(ptemp); |
720 | if (pz2 > 0) pz4 = (z12*(e2 + pz2) - z22*(e2 - pz2)) / 2; | |
721 | else pz4 = (z22*(e2 + pz2) - z12*(e2 - pz2)) / 2; | |
722 | e2 = TMath::Sqrt(pz4*pz4 + pt4*pt4 + mh*mh); | |
723 | ||
724 | // small corr. instead of using Frag. Func. depending on yQ (in addition to ptQ) | |
725 | Float_t ycorr = 0.2, y3, y4; | |
726 | gRandom->RndmArray(2,rand); | |
727 | y3 = 0.5 * TMath::Log((e1 + pz3 + 1.e-13)/(e1 - pz3 + 1.e-13)); | |
728 | y4 = 0.5 * TMath::Log((e2 + pz4 + 1.e-13)/(e2 - pz4 + 1.e-13)); | |
729 | if(TMath::Abs(y3)<ycorr && TMath::Abs(y4)<ycorr && rand[0]>0.5) { | |
730 | ptemp = TMath::Sqrt(e1*e1 - pz3*pz3); | |
731 | y3 = 4*(1 - 2*rand[1]); | |
732 | pz3 = ptemp*TMath::SinH(y3); | |
733 | pz4 = pz3; | |
734 | } | |
735 | } |