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3a9a3487 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//----------------------------------------------------------------------------
17// Implementation of the D0toKpi reconstruction and analysis class
18//
19// Note: the two decay tracks are labelled: 0 (positive track)
20// 1 (negative track)
21//
22// Origin: A. Dainese andrea.dainese@pd.infn.it
23//----------------------------------------------------------------------------
24#include <Riostream.h>
25#include <TH1.h>
26#include <TH2.h>
27#include <TKey.h>
28#include <TFile.h>
29#include <TTree.h>
30#include <TString.h>
31#include <TSystem.h>
32#include <TParticle.h>
33#include "AliESD.h"
34#include "AliStack.h"
35#include "AliRunLoader.h"
36#include "AliITStrackV2.h"
37#include "AliITSVertexerTracks.h"
d681bb2d 38#include "AliESDVertex.h"
3a9a3487 39#include "AliV0vertexer.h"
40#include "AliV0vertex.h"
41#include "AliD0toKpi.h"
42#include "AliD0toKpiAnalysis.h"
43
44typedef struct {
45 Int_t lab;
46 Int_t pdg;
47 Int_t mumlab;
48 Int_t mumpdg;
49 Float_t Vx,Vy,Vz;
50 Float_t Px,Py,Pz;
51} REFTRACK;
52
53ClassImp(AliD0toKpiAnalysis)
54
55//----------------------------------------------------------------------------
56AliD0toKpiAnalysis::AliD0toKpiAnalysis() {
57 // Default constructor
58
59 SetBz();
60 SetPtCut();
61 Setd0Cut();
62 SetMassCut();
63 SetD0Cuts();
64 SetVertex1();
65 SetPID();
66 fVertexOnTheFly = kFALSE;
67 fSim = kFALSE;
68 fOnlySignal = kFALSE;
69 fDebug = kFALSE;
70}
71//----------------------------------------------------------------------------
72AliD0toKpiAnalysis::~AliD0toKpiAnalysis() {}
73//----------------------------------------------------------------------------
74void AliD0toKpiAnalysis::ApplySelection(const Char_t *inName,const Char_t *outName) const {
75 // select candidates that pass fD0Cuts and write them to a new file
76
77 TFile *inFile = TFile::Open(inName);
78
79 TTree *treeD0in=(TTree*)inFile->Get("TreeD0");
80 AliD0toKpiAnalysis *inAnalysis = (AliD0toKpiAnalysis*)inFile->Get("D0toKpiAnalysis");
81 printf("+++\n+++ I N P U T S T A T U S:\n+++\n");
82 inAnalysis->PrintStatus();
83
84
85 AliD0toKpi *d = 0;
86 treeD0in->SetBranchAddress("D0toKpi",&d);
87 Int_t entries = (Int_t)treeD0in->GetEntries();
88
89 printf("+++\n+++ Number of D0 in input tree: %d\n+++\n",entries);
90
91 TTree *treeD0out = new TTree("TreeD0","Tree with selected D0 candidates");
92 treeD0out->Branch("D0toKpi","AliD0toKpi",&d,200000,0);
93
94
95 Int_t okD0=0,okD0bar=0;
96 Int_t nSel = 0;
97
98 for(Int_t i=0; i<entries; i++) {
99 // get event from tree
100 treeD0in->GetEvent(i);
101
102 if(fSim && fOnlySignal && !d->IsSignal()) continue;
103
104 // check if candidate passes selection (as D0 or D0bar)
105 if(d->Select(fD0Cuts,okD0,okD0bar)) {
106 nSel++;
107 treeD0out->Fill();
108 }
109
110 }
111
112 AliD0toKpiAnalysis *outAnalysis = (AliD0toKpiAnalysis*)inAnalysis->Clone("D0toKpiAnalysis");
113 outAnalysis->SetD0Cuts(fD0Cuts);
114 printf("------------------------------------------\n");
115 printf("+++\n+++ O U T P U T S T A T U S:\n+++\n");
116 outAnalysis->PrintStatus();
117
118 printf("+++\n+++ Number of D0 in output tree: %d\n+++\n",nSel);
119
120 TFile* outFile = new TFile(outName,"recreate");
121 treeD0out->Write();
122 outAnalysis->Write();
123 outFile->Close();
124
125 return;
126}
127//----------------------------------------------------------------------------
128Double_t AliD0toKpiAnalysis::CalculateTOFmass(Double_t mom,Double_t length,
129 Double_t time) const {
130 // calculated the mass from momentum, track length from vertex to TOF
131 // and time measured by the TOF
132 if(length==0.) return -1000.;
133 Double_t a = time*time/length/length;
134 if(a > 1.) {
135 a = TMath::Sqrt(a-1.);
136 } else {
137 a = -TMath::Sqrt(1.-a);
138 }
139
140 return mom*a;
141}
142//----------------------------------------------------------------------------
143void AliD0toKpiAnalysis::FindCandidates(Int_t evFirst,Int_t evLast,
144 const Char_t *outName) {
145 // Find D0 candidates and calculate parameters
146
147 if(fBz<-9000.) {
148 printf("AliD0toKpiAnalysis::FindCandidates(): Set B!\n");
149 return;
150 }
151 AliKalmanTrack::SetConvConst(100/0.299792458/fBz);
152
153 TString trkName("AliITStracksV2.root");
154 if(gSystem->AccessPathName(trkName.Data(),kFileExists)) {
155 printf("AliD0toKpiAnalysis::FindCandidates(): No tracks file found!\n");
156 return;
157 }
158
159 TString outName1=outName;
160 TString outName2("nTotEvents.dat");
161
162 Int_t ev;
163 Int_t nTotEv=0,nD0rec=0,nD0rec1ev=0;
164 Double_t dca;
165 Double_t v2[3],mom[6],d0[2];
166 Double_t alphaP,alphaN,ptP,ptN,phiP,phiN;
167 Int_t iTrkP,iTrkN,trkEntries;
168 Int_t nTrksP=0,nTrksN=0;
169 Int_t trkNum[2];
170 Int_t okD0=0,okD0bar=0;
171 Char_t trkTreeName[100],vtxName[100];
172 AliITStrackV2 *postrack = 0;
173 AliITStrackV2 *negtrack = 0;
174
175 // create the AliITSVertexerTracks object
176 // (it will be used only if fVertexOnTheFly=kTrue)
177 AliITSVertexerTracks *vertexer1 = new AliITSVertexerTracks;
178 vertexer1->SetMinTracks(2);
179 vertexer1->SetDebug(0);
180 Int_t skipped[2];
181 Bool_t goodVtx1;
182
183
184 // define the cuts for vertexing
185 Double_t vtxcuts[]={50., // max. allowed chi2
186 0.0, // min. allowed negative daughter's impact param
187 0.0, // min. allowed positive daughter's impact param
188 1.0, // max. allowed DCA between the daughter tracks
189 -1.0, // min. allowed cosine of pointing angle
190 0.0, // min. radius of the fiducial volume
191 2.9};// max. radius of the fiducial volume
192
193 // create the AliV0vertexer object
194 AliV0vertexer *vertexer2 = new AliV0vertexer(vtxcuts);
195
196 // create tree for reconstructed D0s
197 AliD0toKpi *ioD0toKpi=0;
198 TTree *treeD0 = new TTree("TreeD0","Tree with D0 candidates");
199 treeD0->Branch("D0toKpi","AliD0toKpi",&ioD0toKpi,200000,0);
200
201 // open file with tracks
202 TFile *trkFile = TFile::Open(trkName.Data());
203
204 // loop on events in file
205 for(ev=evFirst; ev<=evLast; ev++) {
206 printf(" --- Looking for D0->Kpi in event %d ---\n",ev);
207
208 // retrieve primary vertex from file
209 sprintf(vtxName,"VertexTracks_%d",ev);
d681bb2d 210 AliESDVertex *vertex1stored = (AliESDVertex*)trkFile->Get(vtxName);
3a9a3487 211 vertex1stored->GetXYZ(fV1);
212 delete vertex1stored;
213
214 // retrieve tracks from file
215 sprintf(trkTreeName,"TreeT_ITS_%d",ev);
216 TTree *trkTree=(TTree*)trkFile->Get(trkTreeName);
217 if(!trkTree) {
218 printf("AliD0toKpiAnalysis::FindCandidates():\n tracks tree not found for evet %d\n",ev);
219 continue;
220 }
221 trkEntries = (Int_t)trkTree->GetEntries();
222 printf(" Number of tracks: %d\n",trkEntries);
223
224 // count the total number of events
225 nTotEv++;
226
227 // call function which applies sigle-track selection and
228 // separetes positives and negatives
229 TObjArray trksP(trkEntries/2);
230 Int_t *trkEntryP = new Int_t[trkEntries];
231 TObjArray trksN(trkEntries/2);
232 Int_t *trkEntryN = new Int_t[trkEntries];
233 SelectTracks(*trkTree,trksP,trkEntryP,nTrksP,trksN,trkEntryN,nTrksN);
234
235 nD0rec1ev = 0;
236
237 // loop on positive tracks
238 for(iTrkP=0; iTrkP<nTrksP; iTrkP++) {
239 if(iTrkP%10==0) printf(" Processing positive track number %d of %d\n",iTrkP,nTrksP);
240
241 // get track from track array
242 postrack = (AliITStrackV2*)trksP.At(iTrkP);
243 trkNum[0] = trkEntryP[iTrkP];
244
245 // loop on negative tracks
246 for(iTrkN=0; iTrkN<nTrksN; iTrkN++) {
247 // get track from tracks array
248 negtrack = (AliITStrackV2*)trksN.At(iTrkN);
249 trkNum[1] = trkEntryN[iTrkN];
250
251 AliITStrackV2 nt(*negtrack), pt(*postrack), *pnt=&nt, *ppt=&pt;
252
253 //
254 // ----------- DCA MINIMIZATION ------------------
255 //
256 // find the DCA and propagate the tracks to the DCA
257 dca = vertexer2->PropagateToDCA(pnt,ppt);
258
259 // define the AliV0vertex object
260 AliV0vertex *vertex2 = new AliV0vertex(*pnt,*ppt);
261
262 // get position of the secondary vertex
263 vertex2->GetXYZ(v2[0],v2[1],v2[2]);
264
265 delete vertex2;
266
267 // momenta of the tracks at the vertex
268 ptP = 1./TMath::Abs(ppt->Get1Pt());
269 alphaP = ppt->GetAlpha();
270 phiP = alphaP+TMath::ASin(ppt->GetSnp());
271 mom[0] = ptP*TMath::Cos(phiP);
272 mom[1] = ptP*TMath::Sin(phiP);
273 mom[2] = ptP*ppt->GetTgl();
274
275 ptN = 1./TMath::Abs(pnt->Get1Pt());
276 alphaN = pnt->GetAlpha();
277 phiN = alphaN+TMath::ASin(pnt->GetSnp());
278 mom[3] = ptN*TMath::Cos(phiN);
279 mom[4] = ptN*TMath::Sin(phiN);
280 mom[5] = ptN*pnt->GetTgl();
281
282 goodVtx1 = kTRUE;
283 // no vertexing if DeltaMass > fMassCut
284 if(fVertexOnTheFly) {
285 goodVtx1 = kFALSE;
286 if(SelectInvMass(mom)) {
287 // primary vertex from *other* tracks in event
288 vertexer1->SetVtxStart(fV1[0],fV1[1]);
289 skipped[0] = trkEntryP[iTrkP];
290 skipped[1] = trkEntryN[iTrkN];
291 vertexer1->SetSkipTracks(2,skipped);
d681bb2d 292 AliESDVertex *vertex1onfly =
293 (AliESDVertex*)vertexer1->VertexOnTheFly(*trkTree);
3a9a3487 294 if(vertex1onfly->GetNContributors()>0) goodVtx1 = kTRUE;
295 vertex1onfly->GetXYZ(fV1);
296 //vertex1onfly->PrintStatus();
297 delete vertex1onfly;
298 }
299 }
300
301 // impact parameters of the tracks w.r.t. the primary vertex
302 d0[0] = 10000.*ppt->GetD(fV1[0],fV1[1]);
303 d0[1] = -10000.*pnt->GetD(fV1[0],fV1[1]);
304
305 // create the object AliD0toKpi
306 AliD0toKpi theD0(ev,trkNum,fV1,v2,dca,mom,d0);
307
308 // select D0s
309 if(goodVtx1 && theD0.Select(fD0Cuts,okD0,okD0bar)) {
310
311 // fill the tree
312 ioD0toKpi=&theD0;
313 treeD0->Fill();
314
315 nD0rec++; nD0rec1ev++;
316 ioD0toKpi=0;
317 }
318
319 negtrack = 0;
320 } // loop on negative tracks
321 postrack = 0;
322 } // loop on positive tracks
323
324 trksP.Delete();
325 trksN.Delete();
326 delete [] trkEntryP;
327 delete [] trkEntryN;
328 delete trkTree;
329
330 printf(" Number of D0 candidates: %d\n",nD0rec1ev);
331 } // loop on events in file
332
333
334 printf("\n+++\n+++ Total number of events: %d\n+++\n",nTotEv);
335 printf("\n+++\n+++ Total number of D0 candidates: %d\n+++\n",nD0rec);
336
337 delete vertexer1;
338 delete vertexer2;
339
340 trkFile->Close();
341
342 // create a copy of this class to be written to output file
343 AliD0toKpiAnalysis *copy = (AliD0toKpiAnalysis*)this->Clone("D0toKpiAnalysis");
344 copy->PrintStatus();
345
346 // add PDG codes to decay tracks in found candidates (in simulation mode)
347 // and store tree in the output file
348 if(!fSim) {
349 TFile *outroot = new TFile(outName1.Data(),"recreate");
350 treeD0->Write();
351 copy->Write();
352 outroot->Close();
353 delete outroot;
354 } else {
355 printf(" Now adding information from simulation (PDG codes) ...\n");
356 TTree *treeD0sim = new TTree("TreeD0","Tree with D0 candidates");
357 MakeTracksRefFile(evFirst,evLast);
358 SimulationInfo(treeD0,treeD0sim);
359 delete treeD0;
360 TFile *outroot = new TFile(outName1.Data(),"recreate");
361 treeD0sim->Write();
362 copy->Write();
363 outroot->Close();
364 delete outroot;
365 }
366
367 // write to a file the total number of events
368 FILE *outdat = fopen(outName2.Data(),"w");
369 fprintf(outdat,"%d\n",nTotEv);
370 fclose(outdat);
371
372 return;
373}
374//----------------------------------------------------------------------------
375void AliD0toKpiAnalysis::FindCandidatesESD(Int_t evFirst,Int_t evLast,
376 const Char_t *outName) {
377 // Find D0 candidates and calculate parameters
378
379 if(fBz<-9000.) {
380 printf("AliD0toKpiAnalysis::FindCandidatesESD(): Set B!\n");
381 return;
382 }
383 AliKalmanTrack::SetConvConst(100/0.299792458/fBz);
384
385 TString esdName("AliESDs.root");
386 if(gSystem->AccessPathName(esdName.Data(),kFileExists)) {
387 printf("AliD0toKpiAnalysis::FindCandidatesESD(): No ESDs file found!\n");
388 return;
389 }
390
391 TString outName1=outName;
392 TString outName2("nTotEvents.dat");
393
3a9a3487 394 Int_t nTotEv=0,nD0rec=0,nD0rec1ev=0;
395 Double_t dca;
396 Double_t v2[3],mom[6],d0[2];
397 Double_t alphaP,alphaN,ptP,ptN,phiP,phiN;
398 Int_t iTrkP,iTrkN,trkEntries;
399 Int_t nTrksP=0,nTrksN=0;
400 Int_t trkNum[2];
401 Double_t tofmass[2];
402 Int_t okD0=0,okD0bar=0;
403 AliITStrackV2 *postrack = 0;
404 AliITStrackV2 *negtrack = 0;
405
406 // create the AliITSVertexerTracks object
407 // (it will be used only if fVertexOnTheFly=kTrue)
408 AliITSVertexerTracks *vertexer1 = new AliITSVertexerTracks;
409 vertexer1->SetMinTracks(2);
410 vertexer1->SetDebug(0);
411 Int_t skipped[2];
412 Bool_t goodVtx1;
413
414
415 // define the cuts for vertexing
416 Double_t vtxcuts[]={50., // max. allowed chi2
417 0.0, // min. allowed negative daughter's impact param
418 0.0, // min. allowed positive daughter's impact param
419 1.0, // max. allowed DCA between the daughter tracks
420 -1.0, // min. allowed cosine of pointing angle
421 0.0, // min. radius of the fiducial volume
422 2.9};// max. radius of the fiducial volume
423
424 // create the AliV0vertexer object
425 AliV0vertexer *vertexer2 = new AliV0vertexer(vtxcuts);
426
427 // create tree for reconstructed D0s
428 AliD0toKpi *ioD0toKpi=0;
429 TTree *treeD0 = new TTree("TreeD0","Tree with D0 candidates");
430 treeD0->Branch("D0toKpi","AliD0toKpi",&ioD0toKpi,200000,0);
431
432 // open file with tracks
433 TFile *esdFile = TFile::Open(esdName.Data());
434
435 TKey *key=0;
436 TIter next(esdFile->GetListOfKeys());
437 // loop on events in file
438 while ((key=(TKey*)next())!=0) {
439 AliESD *event=(AliESD*)key->ReadObj();
440 Int_t ev = (Int_t)event->GetEventNumber();
441 if(ev<evFirst || ev>evLast) { delete event; continue; }
442 printf("--- Finding D0 -> Kpi in event %d\n",ev);
443
444 // retrieve primary vertex from file
445 //sprintf(vtxName,"Vertex_%d",ev);
d681bb2d 446 //AliESDVertex *vertex1stored = (AliESDVertex*)trkFile->Get(vtxName);
3a9a3487 447 //vertex1stored->GetXYZ(fV1);
448 //delete vertex1stored;
2257f27e 449 event->GetVertex()->GetXYZ(fV1);
3a9a3487 450
451 trkEntries = event->GetNumberOfTracks();
452 printf(" Number of tracks: %d\n",trkEntries);
453
454 // count the total number of events
455 nTotEv++;
456
457 // call function which applies sigle-track selection and
458 // separetes positives and negatives
459 TObjArray trksP(trkEntries/2);
460 Int_t *trkEntryP = new Int_t[trkEntries];
461 TObjArray trksN(trkEntries/2);
462 Int_t *trkEntryN = new Int_t[trkEntries];
463 TTree *trkTree = new TTree();
464 if(fVertexOnTheFly) {
465 SelectTracksESDvtx(*event,trkTree,trksP,trkEntryP,nTrksP,
466 trksN,trkEntryN,nTrksN);
467 } else {
468 SelectTracksESD(*event,trksP,trkEntryP,nTrksP,
469 trksN,trkEntryN,nTrksN);
470 }
471
472 if(fDebug) printf(" pos. tracks: %d neg .tracks: %d\n",nTrksP,nTrksN);
473
474 nD0rec1ev = 0;
475
476 // loop on positive tracks
477 for(iTrkP=0; iTrkP<nTrksP; iTrkP++) {
478 if((iTrkP%10==0) || fDebug) printf(" Processing positive track number %d of %d\n",iTrkP,nTrksP);
479
480 // get track from track array
481 postrack = (AliITStrackV2*)trksP.UncheckedAt(iTrkP);
482 trkNum[0] = trkEntryP[iTrkP];
483
484 // loop on negative tracks
485 for(iTrkN=0; iTrkN<nTrksN; iTrkN++) {
486
487 // get track from tracks array
488 negtrack = (AliITStrackV2*)trksN.UncheckedAt(iTrkN);
489 trkNum[1] = trkEntryN[iTrkN];
490
491 AliITStrackV2 nt(*negtrack), pt(*postrack), *pnt=&nt, *ppt=&pt;
492
493 //
494 // ----------- DCA MINIMIZATION ------------------
495 //
496 // find the DCA and propagate the tracks to the DCA
497 dca = vertexer2->PropagateToDCA(pnt,ppt);
498
499 // define the AliV0vertex object
500 AliV0vertex *vertex2 = new AliV0vertex(*pnt,*ppt);
501
502 // get position of the secondary vertex
503 vertex2->GetXYZ(v2[0],v2[1],v2[2]);
504
505 delete vertex2;
506
507 // momenta of the tracks at the vertex
508 ptP = 1./TMath::Abs(ppt->Get1Pt());
509 alphaP = ppt->GetAlpha();
510 phiP = alphaP+TMath::ASin(ppt->GetSnp());
511 mom[0] = ptP*TMath::Cos(phiP);
512 mom[1] = ptP*TMath::Sin(phiP);
513 mom[2] = ptP*ppt->GetTgl();
514
515 ptN = 1./TMath::Abs(pnt->Get1Pt());
516 alphaN = pnt->GetAlpha();
517 phiN = alphaN+TMath::ASin(pnt->GetSnp());
518 mom[3] = ptN*TMath::Cos(phiN);
519 mom[4] = ptN*TMath::Sin(phiN);
520 mom[5] = ptN*pnt->GetTgl();
521
522 goodVtx1 = kTRUE;
523 // no vertexing if DeltaMass > fMassCut
524 if(fVertexOnTheFly) {
525 goodVtx1 = kFALSE;
526 if(SelectInvMass(mom)) {
527 // primary vertex from *other* tracks in event
528 vertexer1->SetVtxStart(fV1[0],fV1[1]);
529 skipped[0] = trkEntryP[iTrkP];
530 skipped[1] = trkEntryN[iTrkN];
531 vertexer1->SetSkipTracks(2,skipped);
d681bb2d 532 AliESDVertex *vertex1onfly =
533 (AliESDVertex*)vertexer1->VertexOnTheFly(*trkTree);
3a9a3487 534 if(vertex1onfly->GetNContributors()>0) goodVtx1 = kTRUE;
535 vertex1onfly->GetXYZ(fV1);
536 //vertex1onfly->PrintStatus();
537 delete vertex1onfly;
538 }
539 }
540
541 // impact parameters of the tracks w.r.t. the primary vertex
542 d0[0] = 10000.*ppt->GetD(fV1[0],fV1[1]);
543 d0[1] = -10000.*pnt->GetD(fV1[0],fV1[1]);
544
545 // create the object AliD0toKpi
546 AliD0toKpi theD0(ev,trkNum,fV1,v2,dca,mom,d0);
547
548 // select D0s
549 if(goodVtx1 && theD0.Select(fD0Cuts,okD0,okD0bar)) {
550
551 // get PID info from ESD
552 AliESDtrack *t0 = (AliESDtrack*)event->GetTrack(trkNum[0]);
553 Double_t esdpid0[5];
554 t0->GetESDpid(esdpid0);
555 if(t0->GetStatus()&AliESDtrack::kTOFpid) {
556 tofmass[0] = CalculateTOFmass(t0->GetP(),
557 t0->GetIntegratedLength(),
558 t0->GetTOFsignal());
559 } else {
560 tofmass[0] = -1000.;
561 }
562 AliESDtrack *t1 = (AliESDtrack*)event->GetTrack(trkNum[1]);
563 Double_t esdpid1[5];
564 t1->GetESDpid(esdpid1);
565 if(t1->GetStatus()&AliESDtrack::kTOFpid) {
566 tofmass[1] = CalculateTOFmass(t1->GetP(),
567 t1->GetIntegratedLength(),
568 t1->GetTOFsignal());
569 } else {
570 tofmass[1] = -1000.;
571 }
572
573 theD0.SetPIDresponse(esdpid0,esdpid1);
574 theD0.SetTOFmasses(tofmass);
575
576 // fill the tree
577 ioD0toKpi=&theD0;
578 treeD0->Fill();
579
580 nD0rec++; nD0rec1ev++;
581 ioD0toKpi=0;
582 }
583
584 negtrack = 0;
585 } // loop on negative tracks
586 postrack = 0;
587 } // loop on positive tracks
588
589 trksP.Delete();
590 trksN.Delete();
591 delete [] trkEntryP;
592 delete [] trkEntryN;
593 delete trkTree;
594 delete event;
595
596
597 printf(" Number of D0 candidates: %d\n",nD0rec1ev);
598 } // loop on events in file
599
600
601 printf("\n+++\n+++ Total number of events: %d\n+++\n",nTotEv);
602 printf("\n+++\n+++ Total number of D0 candidates: %d\n+++\n",nD0rec);
603
604 delete vertexer1;
605 delete vertexer2;
606
607 esdFile->Close();
608
609 // create a copy of this class to be written to output file
610 AliD0toKpiAnalysis *copy = (AliD0toKpiAnalysis*)this->Clone("D0toKpiAnalysis");
611
612 // add PDG codes to decay tracks in found candidates (in simulation mode)
613 // and store tree in the output file
614 if(!fSim) {
615 TFile *outroot = new TFile(outName1.Data(),"recreate");
616 treeD0->Write();
617 copy->Write();
618 outroot->Close();
619 delete outroot;
620 } else {
621 printf(" Now adding information from simulation (PDG codes) ...\n");
622 TTree *treeD0sim = new TTree("TreeD0","Tree with D0 candidates");
623 MakeTracksRefFileESD();
624 SimulationInfo(treeD0,treeD0sim);
625 delete treeD0;
626 TFile *outroot = new TFile(outName1.Data(),"recreate");
627 treeD0sim->Write();
628 copy->Write();
629 outroot->Close();
630 delete outroot;
631 }
632
633 // write to a file the total number of events
634 FILE *outdat = fopen(outName2.Data(),"w");
635 fprintf(outdat,"%d\n",nTotEv);
636 fclose(outdat);
637
638 return;
639}
640//-----------------------------------------------------------------------------
641void AliD0toKpiAnalysis::PrintStatus() const {
642 // Print parameters being used
643
644 printf(" fBz = %f T\n",fBz);
645 printf("Preselections:\n");
646 printf(" fPtCut = %f GeV\n",fPtCut);
647 printf(" fd0Cut = %f micron\n",fd0Cut);
648 printf(" fMassCut = %f GeV\n",fMassCut);
649 if(fVertexOnTheFly) printf("Primary vertex on the fly\n");
650 if(fSim) {
651 printf("Simulation mode\n");
652 if(fOnlySignal) printf(" Only signal goes to file\n");
653 }
654 printf("Cuts on candidates:\n");
655 printf(" |M-MD0| [GeV] < %f\n",fD0Cuts[0]);
656 printf(" dca [micron] < %f\n",fD0Cuts[1]);
657 printf(" cosThetaStar < %f\n",fD0Cuts[2]);
658 printf(" pTK [GeV] > %f\n",fD0Cuts[3]);
659 printf(" pTpi [GeV] > %f\n",fD0Cuts[4]);
660 printf(" |d0K| [micron] < %f\n",fD0Cuts[5]);
661 printf(" |d0pi| [micron] < %f\n",fD0Cuts[6]);
662 printf(" d0d0 [micron^2] < %f\n",fD0Cuts[7]);
663 printf(" cosThetaPoint > %f\n",fD0Cuts[8]);
664
665 return;
666}
667//-----------------------------------------------------------------------------
668Bool_t AliD0toKpiAnalysis::SelectInvMass(const Double_t p[6]) const {
669 // Apply preselection in the invariant mass of the pair
670
671 Double_t mD0 = 1.8645;
672 Double_t mPi = 0.13957;
673 Double_t mKa = 0.49368;
674
675 Double_t energy[2];
676 Double_t mom2[2],momTot2;
677
678 mom2[0] = p[0]*p[0] + p[1]*p[1] + p[2]*p[2];
679 mom2[1] = p[3]*p[3] + p[4]*p[4] + p[5]*p[5];
680
681 momTot2 = (p[0]+p[3])*(p[0]+p[3])+
682 (p[1]+p[4])*(p[1]+p[4])+
683 (p[2]+p[5])*(p[2]+p[5]);
684
685 // D0 -> K- pi+
686 energy[1] = TMath::Sqrt(mKa*mKa+mom2[1]);
687 energy[0] = TMath::Sqrt(mPi*mPi+mom2[0]);
688
689 Double_t minvD0 = TMath::Sqrt((energy[0]+energy[1])*(energy[0]+energy[1])-momTot2);
690
691 // D0bar -> K+ pi-
692 energy[0] = TMath::Sqrt(mKa*mKa+mom2[0]);
693 energy[1] = TMath::Sqrt(mPi*mPi+mom2[1]);
694
695 Double_t minvD0bar = TMath::Sqrt((energy[0]+energy[1])*(energy[0]+energy[1])-momTot2);
696
697 if(TMath::Abs(minvD0-mD0) < fMassCut) return kTRUE;
698 if(TMath::Abs(minvD0bar-mD0) < fMassCut) return kTRUE;
699 return kFALSE;
700}
701//-----------------------------------------------------------------------------
702void AliD0toKpiAnalysis::SelectTracks(TTree &trkTree,
703 TObjArray &trksP,Int_t *trkEntryP,Int_t &nTrksP,
704 TObjArray &trksN,Int_t *trkEntryN,Int_t &nTrksN) const {
705 // Create two TObjArrays with positive and negative tracks and
706 // apply single-track preselection
707
708 nTrksP=0,nTrksN=0;
709
710 Int_t entr = (Int_t)trkTree.GetEntries();
711
712 // trasfer tracks from tree to arrays
713 for(Int_t i=0; i<entr; i++) {
714
715 AliITStrackV2 *track = new AliITStrackV2;
716 trkTree.SetBranchAddress("tracks",&track);
717
718 trkTree.GetEvent(i);
719
720 // single track selection
721 if(!SingleTrkCuts(*track)) { delete track; continue; }
722
723 if(track->Get1Pt()>0.) { // negative track
724 trksN.AddLast(track);
725 trkEntryN[nTrksN] = i;
726 nTrksN++;
727 } else { // positive track
728 trksP.AddLast(track);
729 trkEntryP[nTrksP] = i;
730 nTrksP++;
731 }
732
733 }
734
735 return;
736}
737//-----------------------------------------------------------------------------
738void AliD0toKpiAnalysis::SelectTracksESD(AliESD &event,
739 TObjArray &trksP,Int_t *trkEntryP,Int_t &nTrksP,
740 TObjArray &trksN,Int_t *trkEntryN,Int_t &nTrksN) const {
741 // Create two TObjArrays with positive and negative tracks and
742 // apply single-track preselection
743
744 nTrksP=0,nTrksN=0;
745
746 Int_t entr = event.GetNumberOfTracks();
747
748 // transfer ITS tracks from ESD to arrays and to a tree
749 for(Int_t i=0; i<entr; i++) {
750 //if(fDebug) printf(" SelectTracksESD: %d/%d\n",i,entr);
751
752 AliESDtrack *esdtrack = (AliESDtrack*)event.GetTrack(i);
753 UInt_t status = esdtrack->GetStatus();
754
755 if(!(status&AliESDtrack::kITSrefit)) continue;
756
757 AliITStrackV2 *itstrack = new AliITStrackV2(*esdtrack);
758
759 // single track selection
760 if(!SingleTrkCuts(*itstrack))
761 { delete itstrack; continue; }
762
763 if(itstrack->Get1Pt()>0.) { // negative track
764 trksN.AddLast(itstrack);
765 trkEntryN[nTrksN] = i;
766 nTrksN++;
767 } else { // positive track
768 trksP.AddLast(itstrack);
769 trkEntryP[nTrksP] = i;
770 nTrksP++;
771 }
772
773 } // loop on ESD tracks
774
775 return;
776}
777//-----------------------------------------------------------------------------
778void AliD0toKpiAnalysis::SelectTracksESDvtx(AliESD &event,TTree *trkTree,
779 TObjArray &trksP,Int_t *trkEntryP,Int_t &nTrksP,
780 TObjArray &trksN,Int_t *trkEntryN,Int_t &nTrksN) const {
781 // Create two TObjArrays with positive and negative tracks and
782 // apply single-track preselection
783
784 nTrksP=0,nTrksN=0;
785
786 Int_t entr = event.GetNumberOfTracks();
787
788 AliITStrackV2 *itstrackfortree = 0;
789 trkTree->Branch("tracks","AliITStrackV2",&itstrackfortree,entr,0);
790
791
792 // transfer ITS tracks from ESD to arrays and to a tree
793 for(Int_t i=0; i<entr; i++) {
794
795 AliESDtrack *esdtrack = (AliESDtrack*)event.GetTrack(i);
796 UInt_t status = esdtrack->GetStatus();
797
798 if(!(status&AliESDtrack::kITSrefit)) continue;
799
800 AliITStrackV2 *itstrack = new AliITStrackV2(*esdtrack);
801
802 // store track in the tree to be used for primary vertex finding
803 itstrackfortree = new AliITStrackV2(*esdtrack);
804 trkTree->Fill();
805 itstrackfortree = 0;
806
807 // single track selection
808 if(!SingleTrkCuts(*itstrack))
809 { delete itstrack; continue; }
810
811 if(itstrack->Get1Pt()>0.) { // negative track
812 trksN.AddLast(itstrack);
813 trkEntryN[nTrksN] = i;
814 nTrksN++;
815 } else { // positive track
816 trksP.AddLast(itstrack);
817 trkEntryP[nTrksP] = i;
818 nTrksP++;
819 }
820
821 } // loop on esd tracks
822
823 delete itstrackfortree;
824
825 return;
826}
827//-----------------------------------------------------------------------------
828void AliD0toKpiAnalysis::SetD0Cuts(Double_t cut0,Double_t cut1,
829 Double_t cut2,Double_t cut3,Double_t cut4,
830 Double_t cut5,Double_t cut6,
831 Double_t cut7,Double_t cut8) {
832 // Set the cuts for D0 selection
833 fD0Cuts[0] = cut0;
834 fD0Cuts[1] = cut1;
835 fD0Cuts[2] = cut2;
836 fD0Cuts[3] = cut3;
837 fD0Cuts[4] = cut4;
838 fD0Cuts[5] = cut5;
839 fD0Cuts[6] = cut6;
840 fD0Cuts[7] = cut7;
841 fD0Cuts[8] = cut8;
842
843 return;
844}
845//-----------------------------------------------------------------------------
846void AliD0toKpiAnalysis::SetD0Cuts(const Double_t cuts[9]) {
847 // Set the cuts for D0 selection
848
849 for(Int_t i=0; i<9; i++) fD0Cuts[i] = cuts[i];
850
851 return;
852}
853//-----------------------------------------------------------------------------
854Bool_t AliD0toKpiAnalysis::SingleTrkCuts(const AliITStrackV2& trk) const {
855 // Check if track passes some kinematical cuts
856
857 if(TMath::Abs(1./trk.Get1Pt()) < fPtCut)
858 return kFALSE;
859 if(TMath::Abs(10000.*trk.GetD(fV1[0],fV1[1])) < fd0Cut)
860 return kFALSE;
861
862 return kTRUE;
863}
864//----------------------------------------------------------------------------
865void AliD0toKpiAnalysis::MakeTracksRefFile(Int_t evFirst,Int_t evLast)
866 const {
867 // Create a file with simulation info for the reconstructed tracks
868
869 TFile *out = TFile::Open("ITStracksRefFile.root","recreate");
870 TFile *trk = TFile::Open("AliITStracksV2.root");
871 AliRunLoader *rl = AliRunLoader::Open("galice.root");
872
873 // load kinematics
874 rl->LoadKinematics();
875
876 Int_t label;
877 TParticle *part;
878 TParticle *mumpart;
879 REFTRACK reftrk;
880
881 for(Int_t ev=evFirst; ev<=evLast; ev++){
882 rl->GetEvent(ev);
883 AliStack *stack = rl->Stack();
884
885 trk->cd();
886
887 // Tree with tracks
888 char tname[100];
889 sprintf(tname,"TreeT_ITS_%d",ev);
890
891 TTree *tracktree=(TTree*)trk->Get(tname);
892 if(!tracktree) continue;
893 AliITStrackV2 *track = new AliITStrackV2;
894 tracktree->SetBranchAddress("tracks",&track);
895 Int_t nentr=(Int_t)tracktree->GetEntries();
896
897 // Tree for true track parameters
898 char ttname[100];
899 sprintf(ttname,"Tree_Ref_%d",ev);
900 TTree *reftree = new TTree(ttname,"Tree with true track params");
901 reftree->Branch("rectracks",&reftrk,"lab/I:pdg:mumlab:mumpdg:Vx/F:Vy:Vz:Px:Py:Pz");
902
903 for(Int_t i=0; i<nentr; i++) {
904 tracktree->GetEvent(i);
905 label = TMath::Abs(track->GetLabel());
906
907 part = (TParticle*)stack->Particle(label);
908 reftrk.lab = label;
909 reftrk.pdg = part->GetPdgCode();
910 reftrk.mumlab = part->GetFirstMother();
911 if(part->GetFirstMother()>=0) {
912 mumpart = (TParticle*)stack->Particle(part->GetFirstMother());
913 reftrk.mumpdg = mumpart->GetPdgCode();
914 } else {
915 reftrk.mumpdg=-1;
916 }
917 reftrk.Vx = part->Vx();
918 reftrk.Vy = part->Vy();
919 reftrk.Vz = part->Vz();
920 reftrk.Px = part->Px();
921 reftrk.Py = part->Py();
922 reftrk.Pz = part->Pz();
923
924 reftree->Fill();
925 } // loop on tracks
926
927 out->cd();
928 reftree->Write();
929
930 delete track;
931 delete reftree;
932 delete tracktree;
933 delete stack;
934 } // loop on events
935
936 trk->Close();
937 out->Close();
938
939 return;
940}
941//----------------------------------------------------------------------------
942void AliD0toKpiAnalysis::MakeTracksRefFileESD() const {
943 // Create a file with simulation info for the reconstructed tracks
944
945 TFile *outFile = TFile::Open("ITStracksRefFile.root","recreate");
946 TFile *esdFile = TFile::Open("AliESDs.root");
947 AliRunLoader *rl = AliRunLoader::Open("galice.root");
948
949 // load kinematics
950 rl->LoadKinematics();
951
952 Int_t label;
953 TParticle *part;
954 TParticle *mumpart;
955 REFTRACK reftrk;
956
957 TKey *key=0;
958 TIter next(esdFile->GetListOfKeys());
959 // loop on events in file
960 while ((key=(TKey*)next())!=0) {
961 AliESD *event=(AliESD*)key->ReadObj();
962 Int_t ev = (Int_t)event->GetEventNumber();
963
964 rl->GetEvent(ev);
965 AliStack *stack = rl->Stack();
966
967 Int_t nentr=(Int_t)event->GetNumberOfTracks();
968
969 // Tree for true track parameters
970 char ttname[100];
971 sprintf(ttname,"Tree_Ref_%d",ev);
972 TTree *reftree = new TTree(ttname,"Tree with true track params");
973 reftree->Branch("rectracks",&reftrk,"lab/I:pdg:mumlab:mumpdg:Vx/F:Vy:Vz:Px:Py:Pz");
974
975 for(Int_t i=0; i<nentr; i++) {
976 AliESDtrack *esdtrack = (AliESDtrack*)event->GetTrack(i);
977 label = TMath::Abs(esdtrack->GetLabel());
978
979 part = (TParticle*)stack->Particle(label);
980 reftrk.lab = label;
981 reftrk.pdg = part->GetPdgCode();
982 reftrk.mumlab = part->GetFirstMother();
983 if(part->GetFirstMother()>=0) {
984 mumpart = (TParticle*)stack->Particle(part->GetFirstMother());
985 reftrk.mumpdg = mumpart->GetPdgCode();
986 } else {
987 reftrk.mumpdg=-1;
988 }
989 reftrk.Vx = part->Vx();
990 reftrk.Vy = part->Vy();
991 reftrk.Vz = part->Vz();
992 reftrk.Px = part->Px();
993 reftrk.Py = part->Py();
994 reftrk.Pz = part->Pz();
995
996 reftree->Fill();
997
998 } // loop on tracks
999
1000 outFile->cd();
1001 reftree->Write();
1002
1003 delete reftree;
1004 delete event;
1005 delete stack;
1006 } // loop on events
1007
1008 esdFile->Close();
1009 outFile->Close();
1010
1011 return;
1012}
1013//-----------------------------------------------------------------------------
1014void AliD0toKpiAnalysis::SimulationInfo(TTree *treeD0in,TTree *treeD0out) const {
1015 // add pdg codes to candidate decay tracks (for sim)
1016
1017 TString refFileName("ITStracksRefFile.root");
1018 if(fSim && gSystem->AccessPathName(refFileName.Data(),kFileExists)) {
1019 printf("AliD0toKpiAnalysis::SimulationInfo: no reference file found!\n");
1020 return;
1021 }
1022 TFile *refFile = TFile::Open(refFileName.Data());
1023
1024 Char_t refTreeName[100];
1025 Int_t event;
1026 Int_t pdg[2],mumpdg[2],mumlab[2];
1027 REFTRACK reftrk;
1028
1029 // read-in reference tree for event 0 (the only event for Pb-Pb)
1030 sprintf(refTreeName,"Tree_Ref_%d",0);
1031 TTree *refTree0 = (TTree*)refFile->Get(refTreeName);
1032 refTree0->SetBranchAddress("rectracks",&reftrk);
1033
1034 AliD0toKpi *theD0 = 0;
1035 treeD0in->SetBranchAddress("D0toKpi",&theD0);
1036 treeD0out->Branch("D0toKpi","AliD0toKpi",&theD0,200000,0);
1037
1038 Int_t entries = (Int_t)treeD0in->GetEntries();
1039
1040 for(Int_t i=0; i<entries; i++) {
1041 if(i%100==0) printf(" done %d candidates of %d\n",i,entries);
1042
1043 treeD0in->GetEvent(i);
1044 event = theD0->EventNo();
1045
1046 if(event==0) { // always true for Pb-Pb (avoid to read-in tree every time)
1047 refTree0->GetEvent(theD0->GetTrkNum(0));
1048 pdg[0] = reftrk.pdg;
1049 mumpdg[0] = reftrk.mumpdg;
1050 mumlab[0] = reftrk.mumlab;
1051 refTree0->GetEvent(theD0->GetTrkNum(1));
1052 pdg[1] = reftrk.pdg;
1053 mumpdg[1] = reftrk.mumpdg;
1054 mumlab[1] = reftrk.mumlab;
1055 } else {
1056 sprintf(refTreeName,"Tree_Ref_%d",event);
1057 TTree *refTree = (TTree*)refFile->Get(refTreeName);
1058 refTree->SetBranchAddress("rectracks",&reftrk);
1059 refTree->GetEvent(theD0->GetTrkNum(0));
1060 pdg[0] = reftrk.pdg;
1061 mumpdg[0] = reftrk.mumpdg;
1062 mumlab[0] = reftrk.mumlab;
1063 refTree->GetEvent(theD0->GetTrkNum(1));
1064 pdg[1] = reftrk.pdg;
1065 mumpdg[1] = reftrk.mumpdg;
1066 mumlab[1] = reftrk.mumlab;
1067 delete refTree;
1068 }
1069
1070 theD0->SetPdgCodes(pdg);
1071 theD0->SetMumPdgCodes(mumpdg);
1072
1073 if(TMath::Abs(mumpdg[0])==421 && TMath::Abs(mumpdg[1])==421
1074 && mumlab[0]==mumlab[1]) theD0->SetSignal();
1075
1076 if(!fOnlySignal || theD0->IsSignal()) treeD0out->Fill();
1077
1078 }
1079
1080 delete refTree0;
1081
1082 refFile->Close();
1083
1084 return;
1085}
1086
1087
1088
1089
1090
1091