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[u/mrichter/AliRoot.git] / PWG3 / vertexingHF / AliCFHeavyFlavourTaskMultiVar.cxx
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becfe989 1/**************************************************************************
2 * Copyright(c) 1998-2009, 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//-----------------------------------------------------------------------
17// Class for HF corrections as a function of many variables
18//
19// Example of task running on AliEn
20// which provides standard way of calculating acceptance and efficiency
21// between different steps of the procedure.
22// The ouptut of the task is a AliCFContainer from which the efficiencies
23// can be calculated
24//-----------------------------------------------------------------------
25// Author : C. Zampolli, CERN, on the basis of R. Vernet's example
26//-----------------------------------------------------------------------
27
28#include <TCanvas.h>
29#include <TParticle.h>
30#include <TH1I.h>
31#include <TStyle.h>
32
33#include "AliCFHeavyFlavourTaskMultiVar.h"
34#include "AliStack.h"
35#include "AliMCEvent.h"
36#include "AliCFManager.h"
37#include "AliCFContainer.h"
38#include "AliLog.h"
39#include "AliAODEvent.h"
40#include "AliAODRecoDecay.h"
41#include "AliAODRecoDecayHF.h"
42#include "AliAODRecoDecayHF2Prong.h"
43#include "AliAODMCParticle.h"
44
45//__________________________________________________________________________
46AliCFHeavyFlavourTaskMultiVar::AliCFHeavyFlavourTaskMultiVar() :
47 AliAnalysisTaskSE(),
48 fPDG(0),
49 fCFManager(0x0),
50 fHistEventsProcessed(0x0),
51 fCountMC(0),
52 fEvents(0),
223e99e9 53 fFillFromGenerated(kFALSE)
becfe989 54{
55 //
56 //Default ctor
57 //
58}
59//___________________________________________________________________________
60AliCFHeavyFlavourTaskMultiVar::AliCFHeavyFlavourTaskMultiVar(const Char_t* name) :
61 AliAnalysisTaskSE(name),
62 fPDG(0),
63 fCFManager(0x0),
64 fHistEventsProcessed(0x0),
65 fCountMC(0),
66 fEvents(0),
223e99e9 67 fFillFromGenerated(kFALSE)
becfe989 68{
69 //
70 // Constructor. Initialization of Inputs and Outputs
71 //
72 Info("AliCFHeavyFlavourTaskMultiVar","Calling Constructor");
73 /*
74 DefineInput(0) and DefineOutput(0)
75 are taken care of by AliAnalysisTaskSE constructor
76 */
77 DefineOutput(1,TH1I::Class());
78 DefineOutput(2,AliCFContainer::Class());
79}
80
81//___________________________________________________________________________
82AliCFHeavyFlavourTaskMultiVar& AliCFHeavyFlavourTaskMultiVar::operator=(const AliCFHeavyFlavourTaskMultiVar& c)
83{
84 //
85 // Assignment operator
86 //
87 if (this!=&c) {
88 AliAnalysisTaskSE::operator=(c) ;
89 fPDG = c.fPDG;
90 fCFManager = c.fCFManager;
91 fHistEventsProcessed = c.fHistEventsProcessed;
92 }
93 return *this;
94}
95
96//___________________________________________________________________________
97AliCFHeavyFlavourTaskMultiVar::AliCFHeavyFlavourTaskMultiVar(const AliCFHeavyFlavourTaskMultiVar& c) :
98 AliAnalysisTaskSE(c),
99 fPDG(c.fPDG),
100 fCFManager(c.fCFManager),
101 fHistEventsProcessed(c.fHistEventsProcessed),
102 fCountMC(c.fCountMC),
103 fEvents(c.fEvents),
223e99e9 104 fFillFromGenerated(c.fFillFromGenerated)
becfe989 105{
106 //
107 // Copy Constructor
108 //
109}
110
111//___________________________________________________________________________
112AliCFHeavyFlavourTaskMultiVar::~AliCFHeavyFlavourTaskMultiVar() {
113 //
114 //destructor
115 //
116 Info("~AliCFHeavyFlavourTaskMultiVar","Calling Destructor");
117 if (fCFManager) delete fCFManager ;
118 if (fHistEventsProcessed) delete fHistEventsProcessed ;
119}
120
121//_________________________________________________
122void AliCFHeavyFlavourTaskMultiVar::UserExec(Option_t *)
123{
124 //
125 // Main loop function
126 //
127
128 if (!fInputEvent) {
129 Error("UserExec","NO EVENT FOUND!");
130 return;
131 }
132
133 fEvents++;
134 if (fEvents%10000 ==0) AliInfo(Form("Event %d",fEvents));
135 AliAODEvent* aodEvent = dynamic_cast<AliAODEvent*>(fInputEvent);
136 fCFManager->SetEventInfo(aodEvent);
137
138 // MC-event selection
139 Double_t containerInput[6] ;
140
141 //loop on the MC event
142
143 TClonesArray* mcArray = dynamic_cast<TClonesArray*>(aodEvent->FindListObject(AliAODMCParticle::StdBranchName()));
144 if (!mcArray) AliError("Could not find Monte-Carlo in AOD");
145 Int_t icountMC = 0;
146
147 for (Int_t iPart=0; iPart<mcArray->GetEntriesFast(); iPart++) {
148 AliAODMCParticle* mcPart = dynamic_cast<AliAODMCParticle*>(mcArray->At(iPart));
149 if (!mcPart) {
150 AliWarning("Particle not found in tree, skipping");
151 continue;
152 }
153
154 // check the MC-level cuts
155 if (!fCFManager->CheckParticleCuts(0, mcPart)) continue; // 0 stands for MC level
156
157 // fill the container for Gen-level selection
158 Double_t vectorMC[6] = {9999.,9999.,9999.,9999.,9999.,9999.};
159 if (GetGeneratedValuesFromMCParticle(mcPart, mcArray, vectorMC)){
160 containerInput[0] = vectorMC[0];
161 containerInput[1] = vectorMC[1] ;
162 containerInput[2] = vectorMC[2] ;
163 containerInput[3] = vectorMC[3] ;
164 containerInput[4] = vectorMC[4] ;
165 containerInput[5] = vectorMC[5] ; // in micron
166 fCFManager->GetParticleContainer()->Fill(containerInput,kStepGenerated);
167 icountMC++;
168 }
169 else {
170 AliDebug(3,"Problems in filling the container");
171 continue;
172 }
173 }
174
175 AliDebug(2, Form("Found %i MC particles that are D0!!",icountMC));
176 AliDebug(2, Form("aodEvent = %p ",aodEvent));
177
178 // Now go to rec level
179 fCountMC += icountMC;
180 // load heavy flavour vertices
181
1e090d47 182 TClonesArray *arrayD0toKpi = (TClonesArray*)((aodEvent->GetList())->FindObject("D0toKpi"));
183 if (!arrayD0toKpi) AliError("Could not find array of HF vertices");
184 AliDebug(2, Form("Found %d vertices",arrayD0toKpi->GetEntriesFast()));
becfe989 185
1e090d47 186 for (Int_t iD0toKpi = 0; iD0toKpi<arrayD0toKpi->GetEntriesFast(); iD0toKpi++) {
becfe989 187
1e090d47 188 AliAODRecoDecayHF2Prong* d0tokpi = (AliAODRecoDecayHF2Prong*)arrayD0toKpi->At(iD0toKpi);
becfe989 189
190 // cuts can't be applied to RecoDecays particles
1e090d47 191 // if (!fCFManager->CheckParticleCuts(1 , d0tokpi)) continue; // 1 stands for AOD level
becfe989 192
193 // find associated MC particle
1e090d47 194 Int_t mcLabel = d0tokpi->MatchToMC(421,mcArray) ;
becfe989 195 if (mcLabel == -1)
196 {
197 AliDebug(2,"No MC particle found");
198 }
199 else {
200 AliAODMCParticle* mcVtxHF = (AliAODMCParticle*)mcArray->At(mcLabel);
201 if (!mcVtxHF) {
202 AliWarning("Could not find associated MC in AOD MC tree");
203 continue;
204 }
205
206 // check if associated MC v0 passes the cuts
207 if (!fCFManager->CheckParticleCuts(0 ,mcVtxHF)) { // 0 stands for MC
208 AliDebug(2, "Skipping the particles due to cuts");
209 continue;
210 }
211
212 // fill the container
213 // either with reconstructed values....
1e090d47 214 Double_t pt = d0tokpi->Pt();
215 Double_t rapidity = d0tokpi->YD0();
becfe989 216
217 Double_t cosThetaStar = 9999.;
218 Double_t pTpi = 0.;
219 Double_t pTK = 0.;
220 Int_t pdgCode = mcVtxHF->GetPdgCode();
221 if (pdgCode > 0){
1e090d47 222 cosThetaStar = d0tokpi->CosThetaStarD0();
223 pTpi = d0tokpi->PtProng(0);
224 pTK = d0tokpi->PtProng(1);
becfe989 225 }
226 else {
1e090d47 227 cosThetaStar = d0tokpi->CosThetaStarD0bar();
228 pTpi = d0tokpi->PtProng(1);
229 pTK = d0tokpi->PtProng(0);
becfe989 230 }
231
1e090d47 232 Double_t cT = d0tokpi->CtD0();
becfe989 233 AliDebug(2, Form("cT from reconstructed vertex = %f (micron)",cT*1E4));
234 AliDebug(2, Form("pdg code from MC = %d",TMath::Abs(mcVtxHF->GetPdgCode())));
235
236 // ... or with generated values
237
238 if (!fFillFromGenerated){
239 containerInput[0] = pt;
240 containerInput[1] = rapidity;
241 containerInput[2] = cosThetaStar;
242 containerInput[3] = pTpi;
243 containerInput[4] = pTK;
244 containerInput[5] = cT*1.E4; // in micron
245 }
246 else {
247 Double_t vectorMC[6] = {9999.,9999.,9999.,9999.,9999.,9999.};
248 if (GetGeneratedValuesFromMCParticle(mcVtxHF, mcArray, vectorMC)){
249 containerInput[0] = vectorMC[0];
250 containerInput[1] = vectorMC[1] ;
251 containerInput[2] = vectorMC[2] ;
252 containerInput[3] = vectorMC[3] ;
253 containerInput[4] = vectorMC[4] ;
254 containerInput[5] = vectorMC[5] ; // in micron
255 }
256 else {
257 AliDebug(3,"Problems in filling the container");
258 continue;
259 }
260 }
261 AliDebug(2, Form("Filling the container with pt = %f, rapidity = %f, cosThetaStar = %f, pTpi = %f, pTK = %f, cT = %f", containerInput[0], containerInput[1], containerInput[2], containerInput[3], containerInput[4], containerInput[5]));
262 fCFManager->GetParticleContainer()->Fill(containerInput,1) ;
263 }
264 /*
265 // for debugging only, filling container with dummy values
266 Double_t pt = 1.5;
267 Double_t rapidity = 0.5;
268 Double_t cosThetaStar = 0.7;
269 Double_t pTpi = 2.5;
270 Double_t pTK = 1;
271 Double_t cT = 3;
272 containerInput[0] = pt;
273 containerInput[1] = rapidity;
274 containerInput[2] = cosThetaStar;
275 containerInput[3] = pTpi;
276 containerInput[4] = pTK;
277 containerInput[5] = cT;
278 fCFManager->GetParticleContainer()->Fill(containerInput,1) ;
279 */
280
281 }
282
283 fHistEventsProcessed->Fill(0);
284 /* PostData(0) is taken care of by AliAnalysisTaskSE */
285 PostData(1,fHistEventsProcessed) ;
286 PostData(2,fCFManager->GetParticleContainer()) ;
287}
288
289
290//___________________________________________________________________________
291void AliCFHeavyFlavourTaskMultiVar::Terminate(Option_t*)
292{
293 // The Terminate() function is the last function to be called during
294 // a query. It always runs on the client, it can be used to present
295 // the results graphically or save the results to file.
296
297 Info("Terminate","");
298 AliAnalysisTaskSE::Terminate();
299
300 AliInfo(Form("Found %i MC particles that are D0 in MC in %d events",fCountMC,fEvents));
becfe989 301
302 // draw some example plots....
303
304 AliCFContainer *cont= dynamic_cast<AliCFContainer*> (GetOutputData(2));
305
306 // projecting the containers to obtain histograms
307 // first argument = variable, second argument = step
308 TH1D* h00 = cont->ShowProjection(0,0) ; // pt
309 TH1D* h10 = cont->ShowProjection(1,0) ; // rapidity
310 TH1D* h20 = cont->ShowProjection(2,0) ; // cosThetaStar
311 TH1D* h30 = cont->ShowProjection(3,0) ; // pTpi
312 TH1D* h40 = cont->ShowProjection(4,0) ; // pTK
313 TH1D* h50 = cont->ShowProjection(5,0) ; // cT
314
315 TH1D* h01 = cont->ShowProjection(0,1) ; // pt
316 TH1D* h11 = cont->ShowProjection(1,1) ; // rapidity
317 TH1D* h21 = cont->ShowProjection(2,1) ; // cosThetaStar
318 TH1D* h31 = cont->ShowProjection(3,1) ; // pTpi
319 TH1D* h41 = cont->ShowProjection(4,1) ; // pTK
320 TH1D* h51 = cont->ShowProjection(5,1) ; // cT
321
322 h00->SetTitle("pT_D0 (GeV/c)");
323 h10->SetTitle("rapidity");
324 h20->SetTitle("cosThetaStar");
325 h30->SetTitle("pT_pi (GeV/c)");
326 h40->SetTitle("pT_K (Gev/c)");
327 h50->SetTitle("cT (#mum)");
328
329 h00->GetXaxis()->SetTitle("pT_D0 (GeV/c)");
330 h10->GetXaxis()->SetTitle("rapidity");
331 h20->GetXaxis()->SetTitle("cosThetaStar");
332 h30->GetXaxis()->SetTitle("pT_pi (GeV/c)");
333 h40->GetXaxis()->SetTitle("pT_K (Gev/c)");
334 h50->GetXaxis()->SetTitle("cT (#mum)");
335
336 h01->SetTitle("pT_D0 (GeV/c)");
337 h11->SetTitle("rapidity");
338 h21->SetTitle("cosThetaStar");
339 h31->SetTitle("pT_pi (GeV/c)");
340 h41->SetTitle("pT_K (Gev/c)");
341 h51->SetTitle("cT (#mum)");
342
343 h01->GetXaxis()->SetTitle("pT_D0 (GeV/c)");
344 h11->GetXaxis()->SetTitle("rapidity");
345 h21->GetXaxis()->SetTitle("cosThetaStar");
346 h31->GetXaxis()->SetTitle("pT_pi (GeV/c)");
347 h41->GetXaxis()->SetTitle("pT_K (Gev/c)");
348 h51->GetXaxis()->SetTitle("cT (#mum)");
349
350 Double_t max0 = h00->GetMaximum();
351 Double_t max1 = h10->GetMaximum();
352 Double_t max2 = h20->GetMaximum();
353 Double_t max3 = h30->GetMaximum();
354 Double_t max4 = h40->GetMaximum();
355 Double_t max5 = h50->GetMaximum();
356
357 h00->GetYaxis()->SetRangeUser(0,max0*1.2);
358 h10->GetYaxis()->SetRangeUser(0,max1*1.2);
359 h20->GetYaxis()->SetRangeUser(0,max2*1.2);
360 h30->GetYaxis()->SetRangeUser(0,max3*1.2);
361 h40->GetYaxis()->SetRangeUser(0,max4*1.2);
362 h50->GetYaxis()->SetRangeUser(0,max5*1.2);
363
364 h01->GetYaxis()->SetRangeUser(0,max0*1.2);
365 h11->GetYaxis()->SetRangeUser(0,max1*1.2);
366 h21->GetYaxis()->SetRangeUser(0,max2*1.2);
367 h31->GetYaxis()->SetRangeUser(0,max3*1.2);
368 h41->GetYaxis()->SetRangeUser(0,max4*1.2);
369 h51->GetYaxis()->SetRangeUser(0,max5*1.2);
370
371 h00->SetMarkerStyle(20);
372 h10->SetMarkerStyle(24);
373 h20->SetMarkerStyle(21);
374 h30->SetMarkerStyle(25);
375 h40->SetMarkerStyle(27);
376 h50->SetMarkerStyle(28);
377
378 h00->SetMarkerColor(2);
379 h10->SetMarkerColor(2);
380 h20->SetMarkerColor(2);
381 h30->SetMarkerColor(2);
382 h40->SetMarkerColor(2);
383 h50->SetMarkerColor(2);
384
385 h01->SetMarkerStyle(20) ;
386 h11->SetMarkerStyle(24) ;
387 h21->SetMarkerStyle(21) ;
388 h31->SetMarkerStyle(25) ;
389 h41->SetMarkerStyle(27) ;
390 h51->SetMarkerStyle(28) ;
391
392 h01->SetMarkerColor(4);
393 h11->SetMarkerColor(4);
394 h21->SetMarkerColor(4);
395 h31->SetMarkerColor(4);
396 h41->SetMarkerColor(4);
397 h51->SetMarkerColor(4);
398
399 gStyle->SetCanvasColor(0);
400 gStyle->SetFrameFillColor(0);
401 gStyle->SetTitleFillColor(0);
402 gStyle->SetStatColor(0);
403
404 // drawing in 2 separate canvas for a matter of clearity
405 TCanvas * c1 =new TCanvas("c1","pT, rapidiy, cosThetaStar",800,1600);
406 TCanvas * c2 =new TCanvas("c2","pTpi, pTK, cT",800,1600);
407 c1->Divide(2,3);
408 c2->Divide(2,3);
409
410 c1->cd(1);
411 h00->Draw("p");
412 c1->cd(2);
413 h01->Draw("p");
414 c1->cd(3);
415 h10->Draw("p");
416 c1->cd(4);
417 h11->Draw("p");
418 c1->cd(5);
419 h20->Draw("p");
420 c1->cd(6);
421 h21->Draw("p");
422 c1->cd();
423
424 c2->cd(1);
425 h30->Draw("p");
426 c2->cd(2);
427 h31->Draw("p");
428 c2->cd(3);
429 h40->Draw("p");
430 c2->cd(4);
431 h41->Draw("p");
432 c2->cd(5);
433 h50->Draw("p");
434 c2->cd(6);
435 h51->Draw("p");
436 c2->cd();
437
438 c1->SaveAs("Variables/pT_rapidity_cosThetaStar.eps");
439 c2->SaveAs("Variables/pTpi_pTK_cT.eps");
440
441}
442
443//___________________________________________________________________________
444void AliCFHeavyFlavourTaskMultiVar::UserCreateOutputObjects() {
445 //HERE ONE CAN CREATE OUTPUT OBJECTS, IN PARTICULAR IF THE OBJECT PARAMETERS DON'T NEED
446 //TO BE SET BEFORE THE EXECUTION OF THE TASK
447 //
448 Info("UserCreateOutputObjects","CreateOutputObjects of task %s\n", GetName());
449
450 //slot #1
451 OpenFile(1);
452 fHistEventsProcessed = new TH1I("fHistEventsProcessed","",1,0,1) ;
453}
454
becfe989 455//___________________________________________________________________________
456Double_t AliCFHeavyFlavourTaskMultiVar::CosThetaStar(AliAODMCParticle* mcPart, AliAODMCParticle* mcPartDaughter0, AliAODMCParticle* mcPartDaughter1) const {
457
458 //
459 // to calculate cos(ThetaStar) for generated particle
460 // using the K, since mcPartDaughter0 and mcPartDaughter1 always correspond to K and pi respectively
461 // (see where the function is called)
462 //
463
464 Int_t pdgvtx = mcPart->GetPdgCode();
465 /* if (pdgvtx > 0) { // setting as the first daughter always the kaon, to be used to calculate cos(ThetaStar)
466 Int_t pdgprong0 = TMath::Abs(mcPartDaughter0->GetPdgCode());
467 Int_t pdgprong1 = TMath::Abs(mcPartDaughter1->GetPdgCode());
468 AliInfo(Form("D0, with pdgprong0 = %d, pdgprong1 = %d",pdgprong0,pdgprong1));
469 AliDebug(2,"This is a D0");
470 AliAODMCParticle* mcPartdummy = mcPartDaughter0;
471 mcPartDaughter0 = mcPartDaughter1;
472 mcPartDaughter1 = mcPartdummy;
473 }
474 else{
475 AliInfo("D0bar");
476 }
477 */
478 Int_t pdgprong0 = TMath::Abs(mcPartDaughter0->GetPdgCode());
479 Int_t pdgprong1 = TMath::Abs(mcPartDaughter1->GetPdgCode());
480 if (pdgvtx > 0) { // setting as the first daughter always the kaon, to be used to calculate cos(ThetaStar)
481 AliDebug(2,"D0");
482 }
483 else{
484 AliDebug(2,"D0bar");
485 }
486 if (pdgprong0 == 211){
487 AliDebug(2,Form("pdgprong0 = %d, pdgprong1 = %d, switching...",pdgprong0,pdgprong1));
488 AliAODMCParticle* mcPartdummy = mcPartDaughter0;
489 mcPartDaughter0 = mcPartDaughter1;
490 mcPartDaughter1 = mcPartdummy;
491 pdgprong0 = TMath::Abs(mcPartDaughter0->GetPdgCode());
492 pdgprong1 = TMath::Abs(mcPartDaughter1->GetPdgCode());
493 }
494
495 AliDebug(2,Form("After checking, pdgprong0 = %d, pdgprong1 = %d",pdgprong0,pdgprong1));
496 Double_t massvtx = TDatabasePDG::Instance()->GetParticle(TMath::Abs(pdgvtx))->Mass();
497 Double_t massp[2];
498 massp[0] = TDatabasePDG::Instance()->GetParticle(pdgprong0)->Mass();
499 massp[1] = TDatabasePDG::Instance()->GetParticle(pdgprong1)->Mass();
500
501 Double_t pStar = TMath::Sqrt(TMath::Power(massvtx*massvtx-massp[0]*massp[0]-massp[1]*massp[1],2.)-4.*massp[0]*massp[0]*massp[1]*massp[1])/(2.*massvtx);
502
503 Double_t px = mcPartDaughter0->Px()+mcPartDaughter1->Px();
504 Double_t py = mcPartDaughter0->Py()+mcPartDaughter1->Py();
505 Double_t pz = mcPartDaughter0->Pz()+mcPartDaughter1->Pz();
506 Double_t p = TMath::Sqrt(px*px+py*py+pz*pz);
507 Double_t e = TMath::Sqrt(massvtx*massvtx+p*p);
508 Double_t beta = p/e;
509 Double_t gamma = e/massvtx;
510 TVector3 mom(mcPartDaughter0->Px(),mcPartDaughter0->Py(),mcPartDaughter0->Pz());
511 TVector3 momTot(mcPartDaughter0->Px()+mcPartDaughter1->Px(),mcPartDaughter0->Py()+mcPartDaughter1->Py(),mcPartDaughter0->Pz()+mcPartDaughter1->Pz());
512
513 Double_t qlprong = mom.Dot(momTot)/momTot.Mag(); // analog to AliAODRecoDecay::QlProng(0)
514
515 AliDebug(2,Form("pStar = %f, beta = %f, gamma = %f, qlprong = %f, massp[0] = %f", pStar, beta, gamma, qlprong, massp[0]));
516 Double_t cts = (qlprong/gamma-beta*TMath::Sqrt(pStar*pStar+massp[0]*massp[0]))/pStar;
517 AliDebug(2,Form("cts = %f", cts));
518 return cts;
519}
520//___________________________________________________________________________
521Double_t AliCFHeavyFlavourTaskMultiVar::CT(AliAODMCParticle* mcPart, AliAODMCParticle* mcPartDaughter0, AliAODMCParticle* mcPartDaughter1) const {
522
523 //
524 // to calculate cT for generated particle
525 //
526
527 Double_t xmcPart[3] = {0,0,0};
528 Double_t xdaughter0[3] = {0,0,0};
529 Double_t xdaughter1[3] = {0,0,0};
530 mcPart->XvYvZv(xmcPart); // cm
531 mcPartDaughter0->XvYvZv(xdaughter0); // cm
532 mcPartDaughter1->XvYvZv(xdaughter1); //cm
533 Double_t prodVtxD0 = TMath::Sqrt(xmcPart[0]*xmcPart[0]+
534 xmcPart[1]*xmcPart[1]+
535 xmcPart[2]*xmcPart[2]);
536 Double_t prodVtxDaughter0 = TMath::Sqrt(xdaughter0[0]*xdaughter0[0]+
537 xdaughter0[1]*xdaughter0[1]+
538 xdaughter0[2]*xdaughter0[2]);
539 Double_t prodVtxDaughter1 = TMath::Sqrt(xdaughter1[0]*xdaughter1[0]+
540 xdaughter1[1]*xdaughter1[1]+
541 xdaughter1[2]*xdaughter1[2]);
542
543 AliDebug(2, Form("D0: x = %f, y = %f, z = %f, production vertex distance = %f (cm), %f (micron)", xmcPart[0], xmcPart[1], xmcPart[2], prodVtxD0, prodVtxD0*1.E4));
544 AliDebug(2, Form("Daughter0: x = %f, y = %f, z = %f, production vertex distance = %f (cm) %f (micron)", xdaughter0[0], xdaughter0[1], xdaughter0[2], prodVtxDaughter0, prodVtxDaughter0*1E4));
545 AliDebug(2, Form("Daughter1: x = %f, y = %f, z = %f, production vertex distance = %f (cm) %f (micron)", xdaughter1[0], xdaughter1[1], xdaughter1[2], prodVtxDaughter1, prodVtxDaughter1*1.E4));
546
547 Double_t cT0 = TMath::Sqrt((xdaughter0[0]-xmcPart[0])*(xdaughter0[0]-xmcPart[0])+
548 (xdaughter0[1]-xmcPart[1])*(xdaughter0[1]-xmcPart[1])+
549 (xdaughter0[2]-xmcPart[2])*(xdaughter0[2]-xmcPart[2]));
550
551 Double_t cT1 = TMath::Sqrt((xdaughter1[0]-xmcPart[0])*(xdaughter1[0]-xmcPart[0])+
552 (xdaughter1[1]-xmcPart[1])*(xdaughter1[1]-xmcPart[1])+
553 (xdaughter1[2]-xmcPart[2])*(xdaughter1[2]-xmcPart[2]));
554
555 if (cT0 != cT1) {
556 AliWarning("cT from daughter 0 different from cT from daughter 1! Using cT from daughter 0, but PLEASE, CHECK....");
557 }
558
559 // calculating cT from cT0
560
561 Double_t mass = TDatabasePDG::Instance()->GetParticle(mcPart->GetPdgCode())->Mass(); // mcPart->GetPdgCode() should return +/- 421 for the D0/D0bar
562 Double_t p = mcPart-> P();
563 Double_t cT = cT0*mass/p;
564 AliDebug(2, Form("cT from daughter 0 = %f (micron)", cT0*1E4));
565 AliDebug(2, Form("cT from daughter 1 = %f (micron)", cT1*1E4));
566 AliDebug(2, Form("cT (with mass = %f and p = %f) = %f (micron)", mass, p, cT*1E4));
567 return cT;
568}
569//________________________________________________________________________________
570Bool_t AliCFHeavyFlavourTaskMultiVar::GetGeneratedValuesFromMCParticle(AliAODMCParticle* mcPart, TClonesArray* mcArray, Double_t* vectorMC) const {
571
572 //
573 // collecting all the necessary info (pt, y, cosThetaStar, ptPi, ptKa, cT) from MC particle
574 //
575
576 Bool_t isOk = kFALSE;
577
578 // check whether the D0 decays in pi+K
579 // to be added!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!
580 // could use a cut in the CF, but not clear how to define a TDecayChannel
581 // implemented for the time being as a cut on the number of daughters - see later when
582 // getting the daughters
583
584 // getting the daughters
585 Int_t daughter0 = mcPart->GetDaughter(0);
586 Int_t daughter1 = mcPart->GetDaughter(1);
587 AliDebug(2, Form("daughter0 = %d and daughter1 = %d",daughter0,daughter1));
588 if (daughter0 == 0 || daughter1 == 0) {
589 AliDebug(2, "Error! the D0 MC doesn't have correct daughters!!");
590 return isOk;
591 }
592 if (TMath::Abs(daughter1 - daughter0 != 1)) {
593 AliDebug(2, "The D0 MC doesn't come from a 2-prong decay, skipping!!");
594 return isOk;
595 }
596 AliAODMCParticle* mcPartDaughter0 = dynamic_cast<AliAODMCParticle*>(mcArray->At(daughter0));
597 AliAODMCParticle* mcPartDaughter1 = dynamic_cast<AliAODMCParticle*>(mcArray->At(daughter1));
598 if (!mcPartDaughter0 || !mcPartDaughter1) {
599 AliWarning("At least one Daughter Particle not found in tree, skipping");
600 return isOk;
601 }
602
603 Double_t vtx1[3] = {0,0,0}; // primary vertex
604 Double_t vtx2daughter0[3] = {0,0,0}; // secondary vertex from daughter 0
605 Double_t vtx2daughter1[3] = {0,0,0}; // secondary vertex from daughter 1
606 mcPart->XvYvZv(vtx1); // cm
607 // getting vertex from daughters
608 mcPartDaughter0->XvYvZv(vtx2daughter0); // cm
609 mcPartDaughter1->XvYvZv(vtx2daughter1); //cm
610 if (vtx2daughter0[0] != vtx2daughter1[0] && vtx2daughter0[1] != vtx2daughter1[1] && vtx2daughter0[2] != vtx2daughter1[2]) {
611 AliError("Daughters have different secondary vertex, skipping the track");
612 return isOk;
613 }
614 Int_t nprongs = 2;
615 Short_t charge = 0;
616 // always instantiate the AliAODRecoDecay with the positive daughter first, the negative second
617 AliAODMCParticle* positiveDaugh = mcPartDaughter0;
618 AliAODMCParticle* negativeDaugh = mcPartDaughter1;
619 if (mcPartDaughter0->GetPdgCode()<0 && mcPartDaughter1->GetPdgCode()>0){
620 // inverting in case the positive daughter is the second one
621 positiveDaugh = mcPartDaughter1;
622 negativeDaugh = mcPartDaughter0;
623 }
624 // getting the momentum from the daughters
625 Double_t px[2] = {positiveDaugh->Px(), negativeDaugh->Px()};
626 Double_t py[2] = {positiveDaugh->Py(), negativeDaugh->Py()};
627 Double_t pz[2] = {positiveDaugh->Pz(), negativeDaugh->Pz()};
628
629 Double_t d0[2] = {0.,0.};
630
631 AliAODRecoDecayHF* decay = new AliAODRecoDecayHF(vtx1,vtx2daughter0,nprongs,charge,px,py,pz,d0);
632
633 Double_t cosThetaStar = 0.;
634 Double_t cosThetaStarD0 = 0.;
635 Double_t cosThetaStarD0bar = 0.;
636 cosThetaStarD0 = decay->CosThetaStar(1,421,211,321);
637 cosThetaStarD0bar = decay->CosThetaStar(0,421,321,211);
638 if (mcPart->GetPdgCode() == 421){ // D0
639 AliDebug(3, Form("D0, with pdgprong0 = %d, pdgprong1 = %d",mcPartDaughter0->GetPdgCode(),mcPartDaughter1->GetPdgCode()));
640 cosThetaStar = cosThetaStarD0;
641 }
642 else if (mcPart->GetPdgCode() == -421){ // D0bar{
643 AliDebug(3, Form("D0bar, with pdgprong0 = %d, pdgprong1 = %d",mcPartDaughter0->GetPdgCode(),mcPartDaughter1->GetPdgCode()));
644 cosThetaStar = cosThetaStarD0bar;
645 }
646 else{
647 AliWarning("There are problems!! particle was expected to be either a D0 or a D0bar, check...");
648 return vectorMC;
649 }
650 if (cosThetaStar < -1 || cosThetaStar > 1) {
651 AliWarning("Invalid value for cosine Theta star, returning");
652 return isOk;
653 }
654
655 // calculate cos(Theta*) according to the method implemented herein
656
657 Double_t cts = 9999.;
658 cts = CosThetaStar(mcPart, mcPartDaughter0, mcPartDaughter1);
659 if (cts < -1 || cts > 1) {
660 AliWarning("Invalid value for cosine Theta star from AliCFHeavyFlavourTaskMultiVar method");
661 }
662 if (TMath::Abs(cts - cosThetaStar)>0.001) {
663 AliError(Form("cosThetaStar automatically calculated different from that manually calculated!!! cosThetaStar = %f, cosThetaStar = %f", cosThetaStar,cts));
664 }
665
666 Double_t cT = decay->Ct(421);
667
668 // calculate cT from the method implemented herein
669 Double_t cT1 = 0.;
670 cT1 = CT(mcPart, mcPartDaughter0, mcPartDaughter1);
671
672 if (TMath::Abs(cT1 - cT)>0.001) {
673 AliError(Form("cT automatically calculated different from that manually calculated!!! cT = %f, cT1 = %f",cT,cT1));
674 }
675
676 // get the pT of the daughters
677
678 Double_t pTpi = 0.;
679 Double_t pTK = 0.;
680
681 if (TMath::Abs(mcPartDaughter0->GetPdgCode()) == 211) {
682 pTpi = mcPartDaughter0->Pt();
683 pTK = mcPartDaughter1->Pt();
684 }
685 else {
686 pTpi = mcPartDaughter1->Pt();
687 pTK = mcPartDaughter0->Pt();
688 }
689
690 vectorMC[0] = mcPart->Pt();
691 vectorMC[1] = mcPart->Y() ;
692 vectorMC[2] = cosThetaStar ;
693 vectorMC[3] = pTpi ;
694 vectorMC[4] = pTK ;
695 vectorMC[5] = cT*1.E4 ; // in micron
696 isOk = kTRUE;
697 return isOk;
698}
699