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[u/mrichter/AliRoot.git] / ITS / AliITSMultReconstructor.cxx
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7ca4655f 1/**************************************************************************
eefb3acc 2 * Copyright(c) 2007-2009, ALICE Experiment at CERN, All rights reserved. *
7ca4655f 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
7284b2b2 16//_________________________________________________________________________
ac903f1b 17//
7284b2b2 18// Implementation of the ITS-SPD trackleter class
ac903f1b 19//
fa9ed8e9 20// It retrieves clusters in the pixels (theta and phi) and finds tracklets.
21// These can be used to extract charged particle multiplicity from the ITS.
ac903f1b 22//
fa9ed8e9 23// A tracklet consists of two ITS clusters, one in the first pixel layer and
24// one in the second. The clusters are associated if the differences in
25// Phi (azimuth) and Theta (polar angle) are within fiducial windows.
26// In case of multiple candidates the candidate with minimum
27// distance is selected.
968e8539 28//
fa9ed8e9 29// Two methods return the number of tracklets and the number of unassociated
7284b2b2 30// clusters (i.e. not used in any tracklet) in the first SPD layer
31// (GetNTracklets and GetNSingleClusters)
32//
33// The cuts on phi and theta depend on the interacting system (p-p or Pb-Pb)
34// and can be set via AliITSRecoParam class
35// (SetPhiWindow and SetThetaWindow)
ac903f1b 36//
7284b2b2 37// Origin: Tiziano Virgili
38//
39// Current support and development:
40// Domenico Elia, Maria Nicassio (INFN Bari)
41// Domenico.Elia@ba.infn.it, Maria.Nicassio@ba.infn.it
42//
43// Most recent updates:
44// - multiple association forbidden (fOnlyOneTrackletPerC2 = kTRUE)
f606f16a 45// - phi definition changed to ALICE convention (0,2*TMath::pi())
46// - cluster coordinates taken with GetGlobalXYZ()
9b373e9a 47// - fGeometry removed
48// - number of fired chips on the two layers
fa9ed8e9 49// - option to cut duplicates in the overlaps
7b116aa1 50// - options and fiducial cuts via AliITSRecoParam
fa9ed8e9 51// - move from DeltaZeta to DeltaTheta cut
52// - update to the new algorithm by Mariella and Jan Fiete
53// - store also DeltaTheta in the ESD
54// - less new and delete calls when creating the needed arrays
1f9831ab 55//
56// - RS: to decrease the number of new/deletes the clusters data are stored
57// not in float[6] attached to float**, but in 1-D array.
58// - RS: Clusters are sorted in Z in roder to have the same numbering as in the ITS reco
59// - RS: Clusters used by ESDtrack are flagged, this information is passed to AliMulitiplicity object
60// when storing the tracklets and single cluster info
d7c5c1e4 61// - MN: first MC label of single clusters stored
7284b2b2 62//_________________________________________________________________________
ac903f1b 63
7ca4655f 64#include <TClonesArray.h>
65#include <TH1F.h>
66#include <TH2F.h>
67#include <TTree.h>
1f9831ab 68#include <TBits.h>
69#include <TArrayI.h>
f9f90134 70#include <string.h>
ac903f1b 71
7ca4655f 72#include "AliITSMultReconstructor.h"
7b116aa1 73#include "AliITSReconstructor.h"
b51872de 74#include "AliITSRecPoint.h"
b21c1af0 75#include "AliITSRecPointContainer.h"
ac903f1b 76#include "AliITSgeom.h"
b21c1af0 77#include "AliITSgeomTGeo.h"
1f9831ab 78#include "AliITSDetTypeRec.h"
79#include "AliESDEvent.h"
80#include "AliESDVertex.h"
81#include "AliESDtrack.h"
82#include "AliMultiplicity.h"
ac903f1b 83#include "AliLog.h"
fa9ed8e9 84#include "TGeoGlobalMagField.h"
85#include "AliMagF.h"
6de485aa 86#include "AliESDv0.h"
87#include "AliV0.h"
88#include "AliKFParticle.h"
89#include "AliKFVertex.h"
f9f90134 90#include "AliRefArray.h"
ac903f1b 91
92//____________________________________________________________________
0762f3a8 93ClassImp(AliITSMultReconstructor)
ac903f1b 94
3ef75756 95
ac903f1b 96//____________________________________________________________________
7537d03c 97AliITSMultReconstructor::AliITSMultReconstructor():
f9f90134 98fDetTypeRec(0),fESDEvent(0),fTreeRP(0),fTreeRPMix(0),
7537d03c 99fTracklets(0),
968e8539 100fSClusters(0),
7537d03c 101fNTracklets(0),
968e8539 102fNSingleCluster(0),
f9f90134 103fDPhiWindow(0),
104fDThetaWindow(0),
fa9ed8e9 105fPhiShift(0),
7b116aa1 106fRemoveClustersFromOverlaps(0),
107fPhiOverlapCut(0),
108fZetaOverlapCut(0),
7c6da836 109fPhiRotationAngle(0),
f9f90134 110fScaleDTBySin2T(0),
111fNStdDev(1.0),
112fNStdDevSq(1.0),
6de485aa 113//
114fCutPxDrSPDin(0.1),
115fCutPxDrSPDout(0.15),
116fCutPxDz(0.2),
117fCutDCArz(0.5),
118fCutMinElectronProbTPC(0.5),
119fCutMinElectronProbESD(0.1),
120fCutMinP(0.05),
121fCutMinRGamma(2.),
122fCutMinRK0(1.),
123fCutMinPointAngle(0.98),
124fCutMaxDCADauther(0.5),
125fCutMassGamma(0.03),
126fCutMassGammaNSigma(5.),
127fCutMassK0(0.03),
128fCutMassK0NSigma(5.),
129fCutChi2cGamma(2.),
130fCutChi2cK0(2.),
131fCutGammaSFromDecay(-10.),
132fCutK0SFromDecay(-10.),
133fCutMaxDCA(1.),
134//
7537d03c 135fHistOn(0),
136fhClustersDPhiAcc(0),
137fhClustersDThetaAcc(0),
7537d03c 138fhClustersDPhiAll(0),
139fhClustersDThetaAll(0),
7537d03c 140fhDPhiVsDThetaAll(0),
141fhDPhiVsDThetaAcc(0),
7537d03c 142fhetaTracklets(0),
143fhphiTracklets(0),
144fhetaClustersLay1(0),
f9f90134 145fhphiClustersLay1(0),
146//
147 fDPhiShift(0),
148 fDPhiWindow2(0),
149 fDThetaWindow2(0),
150 fPartners(0),
151 fAssociatedLay1(0),
152 fMinDists(0),
153 fBlackList(0),
154//
155 fCreateClustersCopy(0),
156 fClustersLoaded(0),
157 fRecoDone(0),
158 fSPDSeg()
159{
160 for (int i=0;i<2;i++) {
161 fNFiredChips[i] = 0;
162 fClArr[i] = 0;
163 for (int j=0;j<2;j++) fUsedClusLay[i][j] = 0;
164 fDetectorIndexClustersLay[i] = 0;
165 fOverlapFlagClustersLay[i] = 0;
166 fNClustersLay[i] = 0;
167 fClustersLay[i] = 0;
168 }
3ef75756 169 // Method to reconstruct the charged particles multiplicity with the
170 // SPD (tracklets).
f9f90134 171
ac903f1b 172 SetHistOn();
ac903f1b 173
7b116aa1 174 if(AliITSReconstructor::GetRecoParam()) {
7b116aa1 175 SetPhiWindow(AliITSReconstructor::GetRecoParam()->GetTrackleterPhiWindow());
7284b2b2 176 SetThetaWindow(AliITSReconstructor::GetRecoParam()->GetTrackleterThetaWindow());
fa9ed8e9 177 SetPhiShift(AliITSReconstructor::GetRecoParam()->GetTrackleterPhiShift());
7b116aa1 178 SetRemoveClustersFromOverlaps(AliITSReconstructor::GetRecoParam()->GetTrackleterRemoveClustersFromOverlaps());
179 SetPhiOverlapCut(AliITSReconstructor::GetRecoParam()->GetTrackleterPhiOverlapCut());
180 SetZetaOverlapCut(AliITSReconstructor::GetRecoParam()->GetTrackleterZetaOverlapCut());
7c6da836 181 SetPhiRotationAngle(AliITSReconstructor::GetRecoParam()->GetTrackleterPhiRotationAngle());
f9f90134 182 SetNStdDev(AliITSReconstructor::GetRecoParam()->GetTrackleterNStdDevCut());
183 SetScaleDThetaBySin2T(AliITSReconstructor::GetRecoParam()->GetTrackleterScaleDThetaBySin2T());
6de485aa 184 //
185 SetCutPxDrSPDin(AliITSReconstructor::GetRecoParam()->GetMultCutPxDrSPDin());
186 SetCutPxDrSPDout(AliITSReconstructor::GetRecoParam()->GetMultCutPxDrSPDout());
187 SetCutPxDz(AliITSReconstructor::GetRecoParam()->GetMultCutPxDz());
188 SetCutDCArz(AliITSReconstructor::GetRecoParam()->GetMultCutDCArz());
189 SetCutMinElectronProbTPC(AliITSReconstructor::GetRecoParam()->GetMultCutMinElectronProbTPC());
190 SetCutMinElectronProbESD(AliITSReconstructor::GetRecoParam()->GetMultCutMinElectronProbESD());
191 SetCutMinP(AliITSReconstructor::GetRecoParam()->GetMultCutMinP());
192 SetCutMinRGamma(AliITSReconstructor::GetRecoParam()->GetMultCutMinRGamma());
193 SetCutMinRK0(AliITSReconstructor::GetRecoParam()->GetMultCutMinRK0());
194 SetCutMinPointAngle(AliITSReconstructor::GetRecoParam()->GetMultCutMinPointAngle());
195 SetCutMaxDCADauther(AliITSReconstructor::GetRecoParam()->GetMultCutMaxDCADauther());
196 SetCutMassGamma(AliITSReconstructor::GetRecoParam()->GetMultCutMassGamma());
197 SetCutMassGammaNSigma(AliITSReconstructor::GetRecoParam()->GetMultCutMassGammaNSigma());
198 SetCutMassK0(AliITSReconstructor::GetRecoParam()->GetMultCutMassK0());
199 SetCutMassK0NSigma(AliITSReconstructor::GetRecoParam()->GetMultCutMassK0NSigma());
200 SetCutChi2cGamma(AliITSReconstructor::GetRecoParam()->GetMultCutChi2cGamma());
201 SetCutChi2cK0(AliITSReconstructor::GetRecoParam()->GetMultCutChi2cK0());
202 SetCutGammaSFromDecay(AliITSReconstructor::GetRecoParam()->GetMultCutGammaSFromDecay());
203 SetCutK0SFromDecay(AliITSReconstructor::GetRecoParam()->GetMultCutK0SFromDecay());
204 SetCutMaxDCA(AliITSReconstructor::GetRecoParam()->GetMultCutMaxDCA());
205 //
7b116aa1 206 } else {
7b116aa1 207 SetPhiWindow();
7284b2b2 208 SetThetaWindow();
fa9ed8e9 209 SetPhiShift();
7b116aa1 210 SetRemoveClustersFromOverlaps();
211 SetPhiOverlapCut();
212 SetZetaOverlapCut();
7c6da836 213 SetPhiRotationAngle();
214
6de485aa 215 //
216 SetCutPxDrSPDin();
217 SetCutPxDrSPDout();
218 SetCutPxDz();
219 SetCutDCArz();
220 SetCutMinElectronProbTPC();
221 SetCutMinElectronProbESD();
222 SetCutMinP();
223 SetCutMinRGamma();
224 SetCutMinRK0();
225 SetCutMinPointAngle();
226 SetCutMaxDCADauther();
227 SetCutMassGamma();
228 SetCutMassGammaNSigma();
229 SetCutMassK0();
230 SetCutMassK0NSigma();
231 SetCutChi2cGamma();
232 SetCutChi2cK0();
233 SetCutGammaSFromDecay();
234 SetCutK0SFromDecay();
235 SetCutMaxDCA();
7b116aa1 236 }
f9f90134 237 //
fa9ed8e9 238 fTracklets = 0;
239 fSClusters = 0;
f9f90134 240 //
ac903f1b 241 // definition of histograms
fa9ed8e9 242 Bool_t oldStatus = TH1::AddDirectoryStatus();
243 TH1::AddDirectory(kFALSE);
244
7284b2b2 245 fhClustersDPhiAcc = new TH1F("dphiacc", "dphi", 100,-0.1,0.1);
ddced3c8 246 fhClustersDThetaAcc = new TH1F("dthetaacc","dtheta",100,-0.1,0.1);
ddced3c8 247
7284b2b2 248 fhDPhiVsDThetaAcc = new TH2F("dphiVsDthetaAcc","",100,-0.1,0.1,100,-0.1,0.1);
ac903f1b 249
02a95988 250 fhClustersDPhiAll = new TH1F("dphiall", "dphi", 100,0.0,0.5);
7284b2b2 251 fhClustersDThetaAll = new TH1F("dthetaall","dtheta",100,0.0,0.5);
ddced3c8 252
7284b2b2 253 fhDPhiVsDThetaAll = new TH2F("dphiVsDthetaAll","",100,0.,0.5,100,0.,0.5);
ddced3c8 254
255 fhetaTracklets = new TH1F("etaTracklets", "eta", 100,-2.,2.);
f606f16a 256 fhphiTracklets = new TH1F("phiTracklets", "phi", 100, 0., 2*TMath::Pi());
ddced3c8 257 fhetaClustersLay1 = new TH1F("etaClustersLay1", "etaCl1", 100,-2.,2.);
f606f16a 258 fhphiClustersLay1 = new TH1F("phiClustersLay1", "phiCl1", 100, 0., 2*TMath::Pi());
f9f90134 259 for (int i=2;i--;) fStoreRefs[i][0] = fStoreRefs[i][1] = kFALSE;
fa9ed8e9 260 TH1::AddDirectory(oldStatus);
ac903f1b 261}
ddced3c8 262
3ef75756 263//______________________________________________________________________
1f9831ab 264AliITSMultReconstructor::AliITSMultReconstructor(const AliITSMultReconstructor &mr) :
265AliTrackleter(mr),
f9f90134 266fDetTypeRec(0),fESDEvent(0),fTreeRP(0),fTreeRPMix(0),
1f9831ab 267fTracklets(0),
268fSClusters(0),
1f9831ab 269fNTracklets(0),
270fNSingleCluster(0),
f9f90134 271fDPhiWindow(0),
272fDThetaWindow(0),
1f9831ab 273fPhiShift(0),
274fRemoveClustersFromOverlaps(0),
275fPhiOverlapCut(0),
276fZetaOverlapCut(0),
7c6da836 277fPhiRotationAngle(0),
f9f90134 278fScaleDTBySin2T(0),
279fNStdDev(1.0),
280fNStdDevSq(1.0),
6de485aa 281//
282fCutPxDrSPDin(0.1),
283fCutPxDrSPDout(0.15),
284fCutPxDz(0.2),
285fCutDCArz(0.5),
286fCutMinElectronProbTPC(0.5),
287fCutMinElectronProbESD(0.1),
288fCutMinP(0.05),
289fCutMinRGamma(2.),
290fCutMinRK0(1.),
291fCutMinPointAngle(0.98),
292fCutMaxDCADauther(0.5),
293fCutMassGamma(0.03),
294fCutMassGammaNSigma(5.),
295fCutMassK0(0.03),
296fCutMassK0NSigma(5.),
297fCutChi2cGamma(2.),
298fCutChi2cK0(2.),
299fCutGammaSFromDecay(-10.),
300fCutK0SFromDecay(-10.),
301fCutMaxDCA(1.),
302//
1f9831ab 303fHistOn(0),
304fhClustersDPhiAcc(0),
305fhClustersDThetaAcc(0),
306fhClustersDPhiAll(0),
307fhClustersDThetaAll(0),
308fhDPhiVsDThetaAll(0),
309fhDPhiVsDThetaAcc(0),
310fhetaTracklets(0),
311fhphiTracklets(0),
312fhetaClustersLay1(0),
f9f90134 313fhphiClustersLay1(0),
314fDPhiShift(0),
315fDPhiWindow2(0),
316fDThetaWindow2(0),
317fPartners(0),
318fAssociatedLay1(0),
319fMinDists(0),
320fBlackList(0),
321//
322fCreateClustersCopy(0),
323fClustersLoaded(0),
324fRecoDone(0),
325fSPDSeg()
1f9831ab 326 {
327 // Copy constructor :!!! RS ATTENTION: old c-tor reassigned the pointers instead of creating a new copy -> would crash on delete
328 AliError("May not use");
3ef75756 329}
330
331//______________________________________________________________________
7537d03c 332AliITSMultReconstructor& AliITSMultReconstructor::operator=(const AliITSMultReconstructor& mr){
3ef75756 333 // Assignment operator
1f9831ab 334 if (this != &mr) {
335 this->~AliITSMultReconstructor();
336 new(this) AliITSMultReconstructor(mr);
337 }
3ef75756 338 return *this;
339}
340
341//______________________________________________________________________
342AliITSMultReconstructor::~AliITSMultReconstructor(){
343 // Destructor
1ba5b31c 344
345 // delete histograms
346 delete fhClustersDPhiAcc;
347 delete fhClustersDThetaAcc;
1ba5b31c 348 delete fhClustersDPhiAll;
349 delete fhClustersDThetaAll;
1ba5b31c 350 delete fhDPhiVsDThetaAll;
351 delete fhDPhiVsDThetaAcc;
1ba5b31c 352 delete fhetaTracklets;
353 delete fhphiTracklets;
354 delete fhetaClustersLay1;
355 delete fhphiClustersLay1;
f9f90134 356 //
1f9831ab 357 // delete arrays
f9f90134 358 for(Int_t i=0; i<fNTracklets; i++) delete [] fTracklets[i];
fa9ed8e9 359
f9f90134 360 for(Int_t i=0; i<fNSingleCluster; i++) delete [] fSClusters[i];
361
362 //
363 for (int i=0;i<2;i++) {
364 delete[] fClustersLay[i];
365 delete[] fDetectorIndexClustersLay[i];
366 delete[] fOverlapFlagClustersLay[i];
367 delete fClArr[i];
368 for (int j=0;j<2;j++) delete fUsedClusLay[i][j];
369 }
1ba5b31c 370 delete [] fTracklets;
968e8539 371 delete [] fSClusters;
f9f90134 372 //
373 delete[] fPartners; fPartners = 0;
374 delete[] fMinDists; fMinDists = 0;
375 delete fBlackList; fBlackList = 0;
376 //
ddced3c8 377}
ac903f1b 378
379//____________________________________________________________________
1f9831ab 380void AliITSMultReconstructor::Reconstruct(AliESDEvent* esd, TTree* treeRP)
d7c5c1e4 381{
6873ed43 382 if (!treeRP) { AliError(" Invalid ITS cluster tree !\n"); return; }
383 if (!esd) {AliError("ESDEvent is not available, use old reconstructor"); return;}
ac903f1b 384 // reset counters
1f9831ab 385 if (fMult) delete fMult; fMult = 0;
f9f90134 386 fNClustersLay[0] = 0;
387 fNClustersLay[1] = 0;
1f9831ab 388 fNTracklets = 0;
389 fNSingleCluster = 0;
390 //
1f9831ab 391 fESDEvent = esd;
392 fTreeRP = treeRP;
393 //
394 // >>>> RS: this part is equivalent to former AliITSVertexer::FindMultiplicity
395 //
396 // see if there is a SPD vertex
397 Bool_t isVtxOK=kTRUE, isCosmics=kFALSE;
398 AliESDVertex* vtx = (AliESDVertex*)fESDEvent->GetPrimaryVertexSPD();
7fdf95b0 399 if (!vtx || vtx->GetNContributors()<1) isVtxOK = kFALSE;
1f9831ab 400 if (vtx && strstr(vtx->GetTitle(),"cosmics")) {
401 isVtxOK = kFALSE;
402 isCosmics = kTRUE;
403 }
404 //
405 if (!isVtxOK) {
406 if (!isCosmics) {
407 AliDebug(1,"Tracklets multiplicity not determined because the primary vertex was not found");
408 AliDebug(1,"Just counting the number of cluster-fired chips on the SPD layers");
409 }
410 vtx = 0;
411 }
f39a4c9c 412 if(vtx){
413 float vtxf[3] = {vtx->GetX(),vtx->GetY(),vtx->GetZ()};
414 FindTracklets(vtxf);
415 }
416 else {
417 FindTracklets(0);
418 }
1f9831ab 419 //
420 CreateMultiplicityObject();
421}
422
423//____________________________________________________________________
424void AliITSMultReconstructor::Reconstruct(TTree* clusterTree, Float_t* vtx, Float_t* /* vtxRes*/) {
425 //
f9f90134 426 // RS NOTE - this is old reconstructor invocation, to be used from VertexFinder and in analysis mode
d7c5c1e4 427
1f9831ab 428 if (fMult) delete fMult; fMult = 0;
f9f90134 429 fNClustersLay[0] = 0;
430 fNClustersLay[1] = 0;
ac903f1b 431 fNTracklets = 0;
7284b2b2 432 fNSingleCluster = 0;
1f9831ab 433 //
434 if (!clusterTree) { AliError(" Invalid ITS cluster tree !\n"); return; }
435 //
436 fESDEvent = 0;
f9f90134 437 SetTreeRP(clusterTree);
1f9831ab 438 //
439 FindTracklets(vtx);
440 //
441}
7284b2b2 442
f9f90134 443
1f9831ab 444//____________________________________________________________________
f9f90134 445void AliITSMultReconstructor::ReconstructMix(TTree* clusterTree, TTree* clusterTreeMix, Float_t* vtx, Float_t*)
1f9831ab 446{
f9f90134 447 //
448 // RS NOTE - this is old reconstructor invocation, to be used from VertexFinder and in analysis mode
d7c5c1e4 449
f9f90134 450 if (fMult) delete fMult; fMult = 0;
451 fNClustersLay[0] = 0;
452 fNClustersLay[1] = 0;
453 fNTracklets = 0;
454 fNSingleCluster = 0;
455 //
456 if (!clusterTree) { AliError(" Invalid ITS cluster tree !\n"); return; }
457 if (!clusterTreeMix) { AliError(" Invalid ITS cluster tree 2nd event !\n"); return; }
458 //
459 fESDEvent = 0;
460 SetTreeRP(clusterTree);
461 SetTreeRPMix(clusterTreeMix);
462 //
463 FindTracklets(vtx);
464 //
465}
466
467
468//____________________________________________________________________
469void AliITSMultReconstructor::FindTracklets(const Float_t *vtx)
470{
d7c5c1e4 471 // - calls LoadClusterArrays that finds the position of the clusters
472 // (in global coord)
f9f90134 473
d7c5c1e4 474 // - convert the cluster coordinates to theta, phi (seen from the
7c6da836 475 // interaction vertex). Clusters in the inner layer can be now
476 // rotated for combinatorial studies
d7c5c1e4 477 // - makes an array of tracklets
478 //
479 // After this method has been called, the clusters of the two layers
480 // and the tracklets can be retrieved by calling the Get'er methods.
481
482
1f9831ab 483 // Find tracklets converging to vertex
484 //
f9f90134 485 LoadClusterArrays(fTreeRP,fTreeRPMix);
1f9831ab 486 // flag clusters used by ESD tracks
6873ed43 487 if (fESDEvent) ProcessESDTracks();
f9f90134 488 fRecoDone = kTRUE;
1f9831ab 489
490 if (!vtx) return;
3ef75756 491
f9f90134 492 InitAux();
fa9ed8e9 493
ac903f1b 494 // find the tracklets
495 AliDebug(1,"Looking for tracklets... ");
fa9ed8e9 496
f9f90134 497 ClusterPos2Angles(vtx); // convert cluster position to angles wrt vtx
498 //
499 // Step1: find all tracklets allowing double assocation:
500 int found = 1;
7284b2b2 501 while (found > 0) {
7284b2b2 502 found = 0;
f9f90134 503 for (Int_t iC1=0; iC1<fNClustersLay[0]; iC1++) found += AssociateClusterOfL1(iC1);
7284b2b2 504 }
f9f90134 505 //
506 // Step2: store tracklets; remove used clusters
507 for (Int_t iC2=0; iC2<fNClustersLay[1]; iC2++) StoreTrackletForL2Cluster(iC2);
508 //
509 // store unused single clusters of L1
510 StoreL1Singles();
511 //
ac903f1b 512 AliDebug(1,Form("%d tracklets found", fNTracklets));
513}
514
515//____________________________________________________________________
1f9831ab 516void AliITSMultReconstructor::CreateMultiplicityObject()
517{
518 // create AliMultiplicity object and store it in the ESD event
519 //
520 TBits fastOrFiredMap,firedChipMap;
521 if (fDetTypeRec) {
522 fastOrFiredMap = fDetTypeRec->GetFastOrFiredMap();
523 firedChipMap = fDetTypeRec->GetFiredChipMap(fTreeRP);
524 }
525 //
526 fMult = new AliMultiplicity(fNTracklets,fNSingleCluster,fNFiredChips[0],fNFiredChips[1],fastOrFiredMap);
f9f90134 527 fMult->SetMultTrackRefs(kTRUE);
528 // store some details of reco:
529 fMult->SetScaleDThetaBySin2T(fScaleDTBySin2T);
530 fMult->SetDPhiWindow2(fDPhiWindow2);
531 fMult->SetDThetaWindow2(fDThetaWindow2);
532 fMult->SetDPhiShift(fDPhiShift);
533 fMult->SetNStdDev(fNStdDev);
534 //
1f9831ab 535 fMult->SetFiredChipMap(firedChipMap);
536 AliITSRecPointContainer* rcont = AliITSRecPointContainer::Instance();
537 fMult->SetITSClusters(0,rcont->GetNClustersInLayer(1,fTreeRP));
538 for(Int_t kk=2;kk<=6;kk++) fMult->SetITSClusters(kk-1,rcont->GetNClustersInLayerFast(kk));
539 //
f9f90134 540 UInt_t shared[100];
541 AliRefArray *refs[2][2] = {{0,0},{0,0}};
542 for (int il=2;il--;)
543 for (int it=2;it--;) // tracklet_clusters->track references to stor
544 if (fStoreRefs[il][it]) refs[il][it] = new AliRefArray(fNTracklets,0);
545 //
1f9831ab 546 for (int i=fNTracklets;i--;) {
547 float* tlInfo = fTracklets[i];
f9f90134 548 fMult->SetTrackletData(i,tlInfo);
549 for (int itp=0;itp<2;itp++) {
550 for (int ilr=0;ilr<2;ilr++) {
551 if (!fStoreRefs[ilr][itp]) continue; // nothing to store
552 int clID = int(tlInfo[ilr ? kClID2:kClID1]);
553 int nref = fUsedClusLay[ilr][itp]->GetReferences(clID,shared,100);
554 if (!nref) continue;
555 else if (nref==1) refs[ilr][itp]->AddReference(i,shared[0]);
556 else refs[ilr][itp]->AddReferences(i,shared,nref);
557 }
558 }
1f9831ab 559 }
f9f90134 560 fMult->AttachTracklet2TrackRefs(refs[0][0],refs[0][1],refs[1][0],refs[1][1]);
561 //
562 AliRefArray *refsc[2] = {0,0};
563 for (int it=2;it--;) if (fStoreRefs[0][it]) refsc[it] = new AliRefArray(fNClustersLay[0]);
1f9831ab 564 for (int i=fNSingleCluster;i--;) {
565 float* clInfo = fSClusters[i];
f9f90134 566 fMult->SetSingleClusterData(i,clInfo);
567 int clID = int(clInfo[kSCID]);
568 for (int itp=0;itp<2;itp++) {
569 if (!fStoreRefs[0][itp]) continue;
570 int nref = fUsedClusLay[0][itp]->GetReferences(clID,shared,100);
571 if (!nref) continue;
572 else if (nref==1) refsc[itp]->AddReference(i,shared[0]);
573 else refsc[itp]->AddReferences(i,shared,nref);
574 }
1f9831ab 575 }
f9f90134 576 fMult->AttachCluster2TrackRefs(refsc[0],refsc[1]);
1f9831ab 577 fMult->CompactBits();
578 //
579}
580
581
582//____________________________________________________________________
f9f90134 583void AliITSMultReconstructor::LoadClusterArrays(TTree* tree, TTree* treeMix)
584{
585 // load cluster info and prepare tracklets arrays
586 //
587 if (AreClustersLoaded()) {AliInfo("Clusters are already loaded"); return;}
588 LoadClusterArrays(tree,0);
589 LoadClusterArrays(treeMix ? treeMix:tree,1);
590 int nmaxT = TMath::Min(fNClustersLay[0], fNClustersLay[1]);
591 if (fTracklets) delete[] fTracklets;
592 fTracklets = new Float_t*[nmaxT];
593 memset(fTracklets,0,nmaxT*sizeof(Float_t*));
594 //
595 if (fSClusters) delete[] fSClusters;
596 fSClusters = new Float_t*[fNClustersLay[0]];
597 memset(fSClusters,0,fNClustersLay[0]*sizeof(Float_t*));
598 //
599 AliDebug(1,Form("(clusters in layer 1 : %d, layer 2: %d)",fNClustersLay[0],fNClustersLay[1]));
600 AliDebug(1,Form("(cluster-fired chips in layer 1 : %d, layer 2: %d)",fNFiredChips[0],fNFiredChips[1]));
601 SetClustersLoaded();
602}
603
604//____________________________________________________________________
605void AliITSMultReconstructor::LoadClusterArrays(TTree* itsClusterTree, int il)
1f9831ab 606{
ac903f1b 607 // This method
f9f90134 608 // - gets the clusters from the cluster tree for layer il
ac903f1b 609 // - convert them into global coordinates
610 // - store them in the internal arrays
9b373e9a 611 // - count the number of cluster-fired chips
1f9831ab 612 //
d7c5c1e4 613 // RS: This method was strongly modified wrt original. In order to have the same numbering
1f9831ab 614 // of clusters as in the ITS reco I had to introduce sorting in Z
615 // Also note that now the clusters data are stored not in float[6] attached to float**, but in 1-D array
f9f90134 616 AliDebug(1,Form("Loading clusters and cluster-fired chips for layer %d",il));
617 //
618 fNClustersLay[il] = 0;
619 fNFiredChips[il] = 0;
620 for (int i=2;i--;) fStoreRefs[il][i] = kFALSE;
621 //
622 AliITSRecPointContainer* rpcont = 0;
623 static TClonesArray statITSrec("AliITSRecPoint");
624 static TObjArray clArr(100);
625 TBranch* branch = 0;
626 TClonesArray* itsClusters = 0;
627 //
628 if (!fCreateClustersCopy) {
629 rpcont=AliITSRecPointContainer::Instance();
630 itsClusters = rpcont->FetchClusters(0,itsClusterTree);
631 if(!rpcont->IsSPDActive()){
632 AliWarning("No SPD rec points found, multiplicity not calculated");
633 return;
634 }
635 }
636 else {
637 itsClusters = &statITSrec;
638 branch = itsClusterTree->GetBranch("ITSRecPoints");
639 branch->SetAddress(&itsClusters);
640 if (!fClArr[il]) fClArr[il] = new TClonesArray("AliITSRecPoint",100);
641 }
1f9831ab 642 //
fa9ed8e9 643 // count clusters
b21c1af0 644 // loop over the SPD subdetectors
f9f90134 645 int nclLayer = 0;
5afb5e80 646 int detMin = TMath::Max(0,AliITSgeomTGeo::GetModuleIndex(il+1,1,1));
f9f90134 647 int detMax = AliITSgeomTGeo::GetModuleIndex(il+2,1,1);
648 for (int idt=detMin;idt<detMax;idt++) {
649 if (!fCreateClustersCopy) itsClusters = rpcont->UncheckedGetClusters(idt);
650 else branch->GetEvent(idt);
651 int nClusters = itsClusters->GetEntriesFast();
652 if (!nClusters) continue;
653 Int_t nClustersInChip[5] = {0,0,0,0,0};
654 while(nClusters--) {
655 AliITSRecPoint* cluster = (AliITSRecPoint*)itsClusters->UncheckedAt(nClusters);
656 if (!cluster) continue;
778c8b71 657 if (fCreateClustersCopy) cluster = new ((*fClArr[il])[nclLayer]) AliITSRecPoint(*cluster);
f9f90134 658 clArr.AddAtAndExpand(cluster,nclLayer++);
5afb5e80 659 Int_t chipNo = fSPDSeg.GetChipFromLocal(0,cluster->GetDetLocalZ());
660 if(chipNo>=0)nClustersInChip[ chipNo ]++;
1f9831ab 661 }
f9f90134 662 for(Int_t ifChip=5;ifChip--;) if (nClustersInChip[ifChip]) fNFiredChips[il]++;
1f9831ab 663 }
f9f90134 664 // sort the clusters in Z (to have the same numbering as in ITS reco
665 Float_t *z = new Float_t[nclLayer];
666 Int_t *index = new Int_t[nclLayer];
667 for (int ic=0;ic<nclLayer;ic++) z[ic] = ((AliITSRecPoint*)clArr[ic])->GetZ();
668 TMath::Sort(nclLayer,z,index,kFALSE);
669 Float_t* clustersLay = new Float_t[nclLayer*kClNPar];
670 Int_t* detectorIndexClustersLay = new Int_t[nclLayer];
671 Bool_t* overlapFlagClustersLay = new Bool_t[nclLayer];
1f9831ab 672 //
f9f90134 673 for (int ic=0;ic<nclLayer;ic++) {
674 AliITSRecPoint* cluster = (AliITSRecPoint*)clArr[index[ic]];
675 float* clPar = &clustersLay[ic*kClNPar];
676 //
677 cluster->GetGlobalXYZ( clPar );
678 detectorIndexClustersLay[ic] = cluster->GetDetectorIndex();
679 overlapFlagClustersLay[ic] = kFALSE;
680 for (Int_t i=3;i--;) clPar[kClMC0+i] = cluster->GetLabel(i);
681 }
682 clArr.Clear();
683 delete[] z;
684 delete[] index;
685 //
686 if (fOverlapFlagClustersLay[il]) delete[] fOverlapFlagClustersLay[il];
687 fOverlapFlagClustersLay[il] = overlapFlagClustersLay;
688 //
689 if (fDetectorIndexClustersLay[il]) delete[] fDetectorIndexClustersLay[il];
690 fDetectorIndexClustersLay[il] = detectorIndexClustersLay;
691 //
692 for (int it=0;it<2;it++) {
693 if (fUsedClusLay[il][it]) delete fUsedClusLay[il][it];
694 fUsedClusLay[il][it] = new AliRefArray(nclLayer);
695 }
696 //
697 if (fClustersLay[il]) delete[] fClustersLay[il];
698 fClustersLay[il] = clustersLay;
699 fNClustersLay[il] = nclLayer;
1f9831ab 700 //
9b373e9a 701}
f9f90134 702
9b373e9a 703//____________________________________________________________________
f9f90134 704void AliITSMultReconstructor::LoadClusterFiredChips(TTree* itsClusterTree) {
d7c5c1e4 705 // This method
9b373e9a 706 // - gets the clusters from the cluster tree
707 // - counts the number of (cluster)fired chips
708
709 AliDebug(1,"Loading cluster-fired chips ...");
710
711 fNFiredChips[0] = 0;
712 fNFiredChips[1] = 0;
713
b21c1af0 714 AliITSRecPointContainer* rpcont=AliITSRecPointContainer::Instance();
5afb5e80 715 TClonesArray* itsClusters=NULL;
716 rpcont->FetchClusters(0,itsClusterTree);
b21c1af0 717 if(!rpcont->IsSPDActive()){
718 AliWarning("No SPD rec points found, multiplicity not calculated");
719 return;
720 }
9b373e9a 721
9b373e9a 722 // loop over the its subdetectors
b21c1af0 723 Int_t nSPDmodules=AliITSgeomTGeo::GetModuleIndex(3,1,1);
724 for (Int_t iIts=0; iIts < nSPDmodules; iIts++) {
725 itsClusters=rpcont->UncheckedGetClusters(iIts);
9b373e9a 726 Int_t nClusters = itsClusters->GetEntriesFast();
727
728 // number of clusters in each chip of the current module
729 Int_t nClustersInChip[5] = {0,0,0,0,0};
730 Int_t layer = 0;
731
732 // loop over clusters
733 while(nClusters--) {
734 AliITSRecPoint* cluster = (AliITSRecPoint*)itsClusters->UncheckedAt(nClusters);
735
736 layer = cluster->GetLayer();
737 if (layer>1) continue;
738
739 // find the chip for the current cluster
740 Float_t locz = cluster->GetDetLocalZ();
f9f90134 741 Int_t iChip = fSPDSeg.GetChipFromLocal(0,locz);
e9b15b0c 742 if (iChip>=0) nClustersInChip[iChip]++;
9b373e9a 743
744 }// end of cluster loop
745
746 // get number of fired chips in the current module
9b373e9a 747 for(Int_t ifChip=0; ifChip<5; ifChip++) {
748 if(nClustersInChip[ifChip] >= 1) fNFiredChips[layer]++;
749 }
750
751 } // end of its "subdetector" loop
752
b21c1af0 753
9b373e9a 754 AliDebug(1,Form("(cluster-fired chips in layer 1 : %d, layer 2: %d)",fNFiredChips[0],fNFiredChips[1]));
ac903f1b 755}
756//____________________________________________________________________
757void
758AliITSMultReconstructor::SaveHists() {
3ef75756 759 // This method save the histograms on the output file
760 // (only if fHistOn is TRUE).
ac903f1b 761
762 if (!fHistOn)
763 return;
764
ddced3c8 765 fhClustersDPhiAll->Write();
766 fhClustersDThetaAll->Write();
ac903f1b 767 fhDPhiVsDThetaAll->Write();
ddced3c8 768
769 fhClustersDPhiAcc->Write();
770 fhClustersDThetaAcc->Write();
ac903f1b 771 fhDPhiVsDThetaAcc->Write();
ddced3c8 772
773 fhetaTracklets->Write();
774 fhphiTracklets->Write();
775 fhetaClustersLay1->Write();
776 fhphiClustersLay1->Write();
ac903f1b 777}
7b116aa1 778
779//____________________________________________________________________
f9f90134 780void AliITSMultReconstructor::FlagClustersInOverlapRegions (Int_t iC1, Int_t iC2WithBestDist) {
7b116aa1 781
782 Float_t distClSameMod=0.;
783 Float_t distClSameModMin=0.;
784 Int_t iClOverlap =0;
785 Float_t meanRadiusLay1 = 3.99335; // average radius inner layer
786 Float_t meanRadiusLay2 = 7.37935; // average radius outer layer;
787
788 Float_t zproj1=0.;
789 Float_t zproj2=0.;
790 Float_t deZproj=0.;
1f9831ab 791 Float_t* clPar1 = GetClusterLayer1(iC1);
792 Float_t* clPar2B = GetClusterLayer2(iC2WithBestDist);
7b116aa1 793 // Loop on inner layer clusters
f9f90134 794 for (Int_t iiC1=0; iiC1<fNClustersLay[0]; iiC1++) {
795 if (!fOverlapFlagClustersLay[0][iiC1]) {
7b116aa1 796 // only for adjacent modules
f9f90134 797 if ((TMath::Abs(fDetectorIndexClustersLay[0][iC1]-fDetectorIndexClustersLay[0][iiC1])==4)||
798 (TMath::Abs(fDetectorIndexClustersLay[0][iC1]-fDetectorIndexClustersLay[0][iiC1])==76)) {
1f9831ab 799 Float_t *clPar11 = GetClusterLayer1(iiC1);
800 Float_t dePhi=TMath::Abs(clPar11[kClPh]-clPar1[kClPh]);
7b116aa1 801 if (dePhi>TMath::Pi()) dePhi=2.*TMath::Pi()-dePhi;
802
1f9831ab 803 zproj1=meanRadiusLay1/TMath::Tan(clPar1[kClTh]);
804 zproj2=meanRadiusLay1/TMath::Tan(clPar11[kClTh]);
7b116aa1 805
806 deZproj=TMath::Abs(zproj1-zproj2);
807
808 distClSameMod = TMath::Sqrt(TMath::Power(deZproj/fZetaOverlapCut,2)+TMath::Power(dePhi/fPhiOverlapCut,2));
f9f90134 809 if (distClSameMod<=1.) fOverlapFlagClustersLay[0][iiC1]=kTRUE;
7b116aa1 810
811// if (distClSameMod<=1.) {
812// if (distClSameModMin==0. || distClSameMod<distClSameModMin) {
813// distClSameModMin=distClSameMod;
814// iClOverlap=iiC1;
815// }
816// }
817
818
819 } // end adjacent modules
820 }
821 } // end Loop on inner layer clusters
822
f9f90134 823// if (distClSameModMin!=0.) fOverlapFlagClustersLay[0][iClOverlap]=kTRUE;
7b116aa1 824
825 distClSameMod=0.;
826 distClSameModMin=0.;
827 iClOverlap =0;
828 // Loop on outer layer clusters
f9f90134 829 for (Int_t iiC2=0; iiC2<fNClustersLay[1]; iiC2++) {
830 if (!fOverlapFlagClustersLay[1][iiC2]) {
7b116aa1 831 // only for adjacent modules
1f9831ab 832 Float_t *clPar2 = GetClusterLayer2(iiC2);
f9f90134 833 if ((TMath::Abs(fDetectorIndexClustersLay[1][iC2WithBestDist]-fDetectorIndexClustersLay[1][iiC2])==4) ||
834 (TMath::Abs(fDetectorIndexClustersLay[1][iC2WithBestDist]-fDetectorIndexClustersLay[1][iiC2])==156)) {
1f9831ab 835 Float_t dePhi=TMath::Abs(clPar2[kClPh]-clPar2B[kClPh]);
7b116aa1 836 if (dePhi>TMath::Pi()) dePhi=2.*TMath::Pi()-dePhi;
837
1f9831ab 838 zproj1=meanRadiusLay2/TMath::Tan(clPar2B[kClTh]);
839 zproj2=meanRadiusLay2/TMath::Tan(clPar2[kClTh]);
7b116aa1 840
841 deZproj=TMath::Abs(zproj1-zproj2);
842 distClSameMod = TMath::Sqrt(TMath::Power(deZproj/fZetaOverlapCut,2)+TMath::Power(dePhi/fPhiOverlapCut,2));
f9f90134 843 if (distClSameMod<=1.) fOverlapFlagClustersLay[1][iiC2]=kTRUE;
7b116aa1 844
845// if (distClSameMod<=1.) {
846// if (distClSameModMin==0. || distClSameMod<distClSameModMin) {
847// distClSameModMin=distClSameMod;
848// iClOverlap=iiC2;
849// }
850// }
851
852 } // end adjacent modules
853 }
854 } // end Loop on outer layer clusters
855
f9f90134 856// if (distClSameModMin!=0.) fOverlapFlagClustersLay[1][iClOverlap]=kTRUE;
7b116aa1 857
6b489238 858}
1f9831ab 859
860//____________________________________________________________________
f9f90134 861void AliITSMultReconstructor::InitAux()
862{
863 // init arrays/parameters for tracklet reconstruction
864
865 // dPhi shift is field dependent, get average magnetic field
866 Float_t bz = 0;
867 AliMagF* field = 0;
868 if (TGeoGlobalMagField::Instance()) field = dynamic_cast<AliMagF*>(TGeoGlobalMagField::Instance()->GetField());
869 if (!field) {
870 AliError("Could not retrieve magnetic field. Assuming no field. Delta Phi shift will be deactivated in AliITSMultReconstructor.");
871 }
872 else bz = TMath::Abs(field->SolenoidField());
873 fDPhiShift = fPhiShift / 5 * bz;
874 AliDebug(1, Form("Using phi shift of %f", fDPhiShift));
875 //
876 if (fPartners) delete[] fPartners; fPartners = new Int_t[fNClustersLay[1]];
877 if (fMinDists) delete[] fMinDists; fMinDists = new Float_t[fNClustersLay[1]];
878 if (fAssociatedLay1) delete[] fAssociatedLay1; fAssociatedLay1 = new Int_t[fNClustersLay[0]];
879 //
880 if (fBlackList) delete fBlackList; fBlackList = new AliRefArray(fNClustersLay[0]);
881 //
882 // Printf("Vertex in find tracklets...%f %f %f",vtx[0],vtx[1],vtx[2]);
883 for (Int_t i=0; i<fNClustersLay[1]; i++) {
884 fPartners[i] = -1;
885 fMinDists[i] = 2*fNStdDev;
886 }
887 memset(fAssociatedLay1,0,fNClustersLay[0]*sizeof(Int_t));
888 //
889}
890
891//____________________________________________________________________
892void AliITSMultReconstructor::ClusterPos2Angles(const Float_t *vtx)
893{
894 // convert cluster coordinates to angles wrt vertex
895 for (int ilr=0;ilr<2;ilr++) {
896 for (Int_t iC=0; iC<fNClustersLay[ilr]; iC++) {
897 float* clPar = GetClusterOfLayer(ilr,iC);
898 CalcThetaPhi(clPar[kClTh]-vtx[0],clPar[kClPh]-vtx[1],clPar[kClZ]-vtx[2],clPar[kClTh],clPar[kClPh]);
899 if (ilr==0) {
900 clPar[kClPh] = clPar[kClPh] + fPhiRotationAngle; // rotation of inner layer for comb studies
901 if (fHistOn) {
902 Float_t eta = clPar[kClTh];
903 eta= TMath::Tan(eta/2.);
904 eta=-TMath::Log(eta);
905 fhetaClustersLay1->Fill(eta);
906 fhphiClustersLay1->Fill(clPar[kClPh]);
907 }
908 }
909 }
910 }
911 //
912}
913
914//____________________________________________________________________
915Int_t AliITSMultReconstructor::AssociateClusterOfL1(Int_t iC1)
916{
917 // search association of cluster iC1 of L1 with all clusters of L2
918 if (fAssociatedLay1[iC1] != 0) return 0;
919 Int_t iC2WithBestDist = -1; // reset
920 Double_t minDist = 2*fNStdDev; // reset
921 float* clPar1 = GetClusterLayer1(iC1);
922 for (Int_t iC2=0; iC2<fNClustersLay[1]; iC2++) {
923 //
924 if (fBlackList->IsReferred(iC1,iC2)) continue;
925 float* clPar2 = GetClusterLayer2(iC2);
926 //
927 // find the difference in angles
928 Double_t dTheta = TMath::Abs(clPar2[kClTh] - clPar1[kClTh]);
929 Double_t dPhi = TMath::Abs(clPar2[kClPh] - clPar1[kClPh]);
930 // Printf("detheta %f dephi %f", dTheta,dPhi);
931 //
932 if (dPhi>TMath::Pi()) dPhi=2.*TMath::Pi()-dPhi; // take into account boundary condition
933 //
934 if (fHistOn) {
935 fhClustersDPhiAll->Fill(dPhi);
936 fhClustersDThetaAll->Fill(dTheta);
937 fhDPhiVsDThetaAll->Fill(dTheta, dPhi);
938 }
939 Float_t d = CalcDist(dPhi,dTheta,clPar1[kClTh]); // make "elliptical" cut in Phi and Theta!
940 // look for the minimum distance: the minimum is in iC2WithBestDist
941 if (d<fNStdDev && d<minDist) { minDist=d; iC2WithBestDist = iC2; }
942 }
943 //
944 if (minDist<fNStdDev) { // This means that a cluster in layer 2 was found that matches with iC1
945 //
946 if (fMinDists[iC2WithBestDist] > minDist) {
947 Int_t oldPartner = fPartners[iC2WithBestDist];
948 fPartners[iC2WithBestDist] = iC1;
949 fMinDists[iC2WithBestDist] = minDist;
950 //
951 fAssociatedLay1[iC1] = 1; // mark as assigned
952 //
953 if (oldPartner != -1) {
954 // redo partner search for cluster in L0 (oldPartner), putting this one (iC2WithBestDist) on its fBlackList
955 fBlackList->AddReference(oldPartner,iC2WithBestDist);
956 fAssociatedLay1[oldPartner] = 0; // mark as free
957 }
958 } else {
959 // try again to find a cluster without considering iC2WithBestDist
960 fBlackList->AddReference(iC1,iC2WithBestDist);
961 }
962 //
963 }
964 else fAssociatedLay1[iC1] = 2;// cluster has no partner; remove
965 //
966 return 1;
967}
968
969//____________________________________________________________________
970Int_t AliITSMultReconstructor::StoreTrackletForL2Cluster(Int_t iC2)
971{
972 // build tracklet for cluster iC2 of layer 2
973 if (fPartners[iC2] == -1) return 0;
974 if (fRemoveClustersFromOverlaps) FlagClustersInOverlapRegions (fPartners[iC2],iC2);
975 // Printf("saving tracklets");
976 if (fOverlapFlagClustersLay[0][fPartners[iC2]] || fOverlapFlagClustersLay[1][iC2]) return 0;
977 float* clPar2 = GetClusterLayer2(iC2);
978 float* clPar1 = GetClusterLayer1(fPartners[iC2]);
979 //
980 Float_t* tracklet = fTracklets[fNTracklets] = new Float_t[kTrNPar]; // RS Add also the cluster id's
981 //
982 tracklet[kTrTheta] = clPar1[kClTh]; // use the theta from the clusters in the first layer
983 tracklet[kTrPhi] = clPar1[kClPh]; // use the phi from the clusters in the first layer
984 tracklet[kTrDPhi] = clPar1[kClPh] - clPar2[kClPh]; // store the difference between phi1 and phi2
985 //
986 // define dphi in the range [0,pi] with proper sign (track charge correlated)
987 if (tracklet[kTrDPhi] > TMath::Pi()) tracklet[kTrDPhi] = tracklet[kTrDPhi]-2.*TMath::Pi();
988 if (tracklet[kTrDPhi] < -TMath::Pi()) tracklet[kTrDPhi] = tracklet[kTrDPhi]+2.*TMath::Pi();
989 //
990 tracklet[kTrDTheta] = clPar1[kClTh] - clPar2[kClTh]; // store the theta1-theta2
991 //
992 if (fHistOn) {
993 fhClustersDPhiAcc->Fill(tracklet[kTrDPhi]);
994 fhClustersDThetaAcc->Fill(tracklet[kTrDTheta]);
995 fhDPhiVsDThetaAcc->Fill(tracklet[kTrDTheta],tracklet[kTrDPhi]);
996 }
997 //
998 // find label
999 // if equal label in both clusters found this label is assigned
1000 // if no equal label can be found the first labels of the L1 AND L2 cluster are assigned
1001 Int_t label1=0,label2=0;
1002 while (label2 < 3) {
1003 if ( int(clPar1[kClMC0+label1])!=-2 && int(clPar1[kClMC0+label1])==int(clPar2[kClMC0+label2])) break;
1004 if (++label1 == 3) { label1 = 0; label2++; }
1005 }
1006 if (label2 < 3) {
1007 AliDebug(AliLog::kDebug, Form("Found label %d == %d for tracklet candidate %d\n",
1008 (Int_t) clPar1[kClMC0+label1], (Int_t) clPar1[kClMC0+label2], fNTracklets));
1009 tracklet[kTrLab1] = tracklet[kTrLab2] = clPar1[kClMC0+label1];
1010 } else {
1011 AliDebug(AliLog::kDebug, Form("Did not find label %d %d %d %d %d %d for tracklet candidate %d\n",
1012 (Int_t) clPar1[kClMC0], (Int_t) clPar1[kClMC1], (Int_t) clPar1[kClMC2],
1013 (Int_t) clPar2[kClMC0], (Int_t) clPar2[kClMC1], (Int_t) clPar2[kClMC2], fNTracklets));
1014 tracklet[kTrLab1] = clPar1[kClMC0];
1015 tracklet[kTrLab2] = clPar2[kClMC0];
1016 }
1017 //
1018 if (fHistOn) {
1019 Float_t eta = tracklet[kTrTheta];
1020 eta= TMath::Tan(eta/2.);
1021 eta=-TMath::Log(eta);
1022 fhetaTracklets->Fill(eta);
1023 fhphiTracklets->Fill(tracklet[kTrPhi]);
1024 }
1025 //
1026 tracklet[kClID1] = fPartners[iC2];
1027 tracklet[kClID2] = iC2;
1028 //
1029 // Printf("Adding tracklet candidate");
1030 AliDebug(1,Form(" Adding tracklet candidate %d ", fNTracklets));
1031 AliDebug(1,Form(" Cl. %d of Layer 1 and %d of Layer 2", fPartners[iC2], iC2));
1032 fNTracklets++;
1033 fAssociatedLay1[fPartners[iC2]] = 1;
1034 //
1035 return 1;
1036}
1037
1038//____________________________________________________________________
1039void AliITSMultReconstructor::StoreL1Singles()
1040{
1041 // Printf("saving single clusters...");
1042 for (Int_t iC1=0; iC1<fNClustersLay[0]; iC1++) {
1043 float* clPar1 = GetClusterLayer1(iC1);
1044 if (fAssociatedLay1[iC1]==2||fAssociatedLay1[iC1]==0) {
1045 fSClusters[fNSingleCluster] = new Float_t[kClNPar];
1046 fSClusters[fNSingleCluster][kSCTh] = clPar1[kClTh];
1047 fSClusters[fNSingleCluster][kSCPh] = clPar1[kClPh];
1048 fSClusters[fNSingleCluster][kSCLab] = clPar1[kClMC0];
1049 fSClusters[fNSingleCluster][kSCID] = iC1;
1050 AliDebug(1,Form(" Adding a single cluster %d (cluster %d of layer 1)",
1051 fNSingleCluster, iC1));
1052 fNSingleCluster++;
1053 }
1054 }
1055 //
1056}
1057
1058//____________________________________________________________________
1f9831ab 1059void AliITSMultReconstructor::ProcessESDTracks()
1060{
1061 // Flag the clusters used by ESD tracks
1062 // Flag primary tracks to be used for multiplicity counting
1063 //
6873ed43 1064 if (!fESDEvent) return;
1f9831ab 1065 AliESDVertex* vtx = (AliESDVertex*)fESDEvent->GetPrimaryVertexTracks();
7fdf95b0 1066 if (!vtx || vtx->GetNContributors()<1) vtx = (AliESDVertex*)fESDEvent->GetPrimaryVertexSPD();
1067 if (!vtx || vtx->GetNContributors()<1) {
1f9831ab 1068 AliDebug(1,"No primary vertex: cannot flag primary tracks");
1069 return;
1070 }
1071 Int_t ntracks = fESDEvent->GetNumberOfTracks();
1072 for(Int_t itr=0; itr<ntracks; itr++) {
1073 AliESDtrack* track = fESDEvent->GetTrack(itr);
1074 if (!track->IsOn(AliESDtrack::kITSin)) continue; // use only tracks propagated in ITS to vtx
34581d1e 1075 FlagTrackClusters(itr);
6de485aa 1076 FlagIfSecondary(track,vtx);
1f9831ab 1077 }
6de485aa 1078 FlagV0s(vtx);
1f9831ab 1079 //
1080}
1081
1082//____________________________________________________________________
34581d1e 1083void AliITSMultReconstructor::FlagTrackClusters(Int_t id)
1f9831ab 1084{
1085 // RS: flag the SPD clusters of the track if it is useful for the multiplicity estimation
1086 //
34581d1e 1087 const AliESDtrack* track = fESDEvent->GetTrack(id);
1f9831ab 1088 Int_t idx[12];
1089 if ( track->GetITSclusters(idx)<3 ) return; // at least 3 clusters must be used in the fit
f9f90134 1090 Int_t itsType = track->IsOn(AliESDtrack::kITSpureSA) ? 1:0;
1091
1092 for (int i=6/*AliESDfriendTrack::kMaxITScluster*/;i--;) { // ignore extras: note: i>=6 is for extra clusters
1f9831ab 1093 if (idx[i]<0) continue;
1094 int layID= (idx[i] & 0xf0000000) >> 28;
1095 if (layID>1) continue; // SPD only
1096 int clID = (idx[i] & 0x0fffffff);
f9f90134 1097 fUsedClusLay[layID][itsType]->AddReference(clID,id);
1098 fStoreRefs[layID][itsType] = kTRUE;
1f9831ab 1099 }
1100 //
1101}
1102
1103//____________________________________________________________________
6de485aa 1104void AliITSMultReconstructor::FlagIfSecondary(AliESDtrack* track, const AliVertex* vtx)
1f9831ab 1105{
1106 // RS: check if the track is primary and set the flag
6de485aa 1107 double cut = (track->HasPointOnITSLayer(0)||track->HasPointOnITSLayer(1)) ? fCutPxDrSPDin:fCutPxDrSPDout;
1108 float xz[2];
1109 track->GetDZ(vtx->GetX(),vtx->GetY(),vtx->GetZ(), fESDEvent->GetMagneticField(), xz);
1110 if (TMath::Abs(xz[0]*track->P())>cut || TMath::Abs(xz[1]*track->P())>fCutPxDz ||
1111 TMath::Abs(xz[0])>fCutDCArz || TMath::Abs(xz[1])>fCutDCArz)
1112 track->SetStatus(AliESDtrack::kMultSec);
1113 else track->ResetStatus(AliESDtrack::kMultSec);
1114}
1115
1116//____________________________________________________________________
1117void AliITSMultReconstructor::FlagV0s(const AliESDVertex *vtx)
1118{
1119 // flag tracks belonging to v0s
1120 //
1121 const double kK0Mass = 0.4976;
1122 //
1123 AliV0 pvertex;
1124 AliKFVertex vertexKF;
1125 AliKFParticle epKF0,epKF1,pipmKF0,piKF0,piKF1,gammaKF,k0KF;
1126 Double_t mass,massErr,chi2c;
1127 enum {kKFIni=BIT(14)};
1128 //
1129 double recVtx[3];
1130 float recVtxF[3];
1131 vtx->GetXYZ(recVtx);
1132 for (int i=3;i--;) recVtxF[i] = recVtx[i];
1133 //
1134 int ntracks = fESDEvent->GetNumberOfTracks();
1135 if (ntracks<2) return;
1136 //
1137 vertexKF.X() = recVtx[0];
1138 vertexKF.Y() = recVtx[1];
1139 vertexKF.Z() = recVtx[2];
1140 vertexKF.Covariance(0,0) = vtx->GetXRes()*vtx->GetXRes();
1141 vertexKF.Covariance(1,2) = vtx->GetYRes()*vtx->GetYRes();
1142 vertexKF.Covariance(2,2) = vtx->GetZRes()*vtx->GetZRes();
1143 //
1144 AliESDtrack *trc0,*trc1;
1145 for (int it0=0;it0<ntracks;it0++) {
1146 trc0 = fESDEvent->GetTrack(it0);
1147 if (trc0->IsOn(AliESDtrack::kMultInV0)) continue;
1148 if (!trc0->IsOn(AliESDtrack::kITSin)) continue;
1149 Bool_t isSAP = trc0->IsPureITSStandalone();
1150 Int_t q0 = trc0->Charge();
1151 Bool_t testGamma = CanBeElectron(trc0);
1152 epKF0.ResetBit(kKFIni);
1153 piKF0.ResetBit(kKFIni);
1154 double bestChi2=1e16;
1155 int bestID = -1;
1156 //
1157 for (int it1=it0+1;it1<ntracks;it1++) {
1158 trc1 = fESDEvent->GetTrack(it1);
1159 if (trc1->IsOn(AliESDtrack::kMultInV0)) continue;
1160 if (!trc1->IsOn(AliESDtrack::kITSin)) continue;
1161 if (trc1->IsPureITSStandalone() != isSAP) continue; // pair separately ITS_SA_Pure tracks and TPC/ITS+ITS_SA
1162 if ( (q0+trc1->Charge())!=0 ) continue; // don't pair like signs
1163 //
1164 pvertex.SetParamN(q0<0 ? *trc0:*trc1);
1165 pvertex.SetParamP(q0>0 ? *trc0:*trc1);
1166 pvertex.Update(recVtxF);
1167 if (pvertex.P()<fCutMinP) continue;
1168 if (pvertex.GetV0CosineOfPointingAngle()<fCutMinPointAngle) continue;
1169 if (pvertex.GetDcaV0Daughters()>fCutMaxDCADauther) continue;
1170 double d = pvertex.GetD(recVtx[0],recVtx[1],recVtx[2]);
1171 if (d>fCutMaxDCA) continue;
1172 double dx=recVtx[0]-pvertex.Xv(), dy=recVtx[1]-pvertex.Yv();
1173 double rv = TMath::Sqrt(dx*dx+dy*dy);
1174 //
1175 // check gamma conversion hypothesis ----------------------------------------------------------->>>
1176 Bool_t gammaOK = kFALSE;
1177 while (testGamma && CanBeElectron(trc1)) {
1178 if (rv<fCutMinRGamma) break;
1179 if (!epKF0.TestBit(kKFIni)) {
1180 new(&epKF0) AliKFParticle(*trc0,q0>0 ? kPositron:kElectron);
1181 epKF0.SetBit(kKFIni);
1182 }
1183 new(&epKF1) AliKFParticle(*trc1,q0<0 ? kPositron:kElectron);
1184 gammaKF.Initialize();
1185 gammaKF += epKF0;
1186 gammaKF += epKF1;
1187 gammaKF.SetProductionVertex(vertexKF);
1188 gammaKF.GetMass(mass,massErr);
1189 if (mass>fCutMassGamma || (massErr>0&&(mass>massErr*fCutMassGammaNSigma))) break;
1190 if (gammaKF.GetS()<fCutGammaSFromDecay) break;
1191 gammaKF.SetMassConstraint(0.,0.001);
1192 chi2c = (gammaKF.GetNDF()!=0) ? gammaKF.GetChi2()/gammaKF.GetNDF() : 1000;
1193 if (chi2c>fCutChi2cGamma) break;
1194 gammaOK = kTRUE;
1195 if (chi2c>bestChi2) break;
1196 bestChi2 = chi2c;
1197 bestID = it1;
1198 break;
1199 }
1200 if (gammaOK) continue;
1201 // check gamma conversion hypothesis -----------------------------------------------------------<<<
1202 // check K0 conversion hypothesis ----------------------------------------------------------->>>
1203 while (1) {
1204 if (rv<fCutMinRK0) break;
1205 if (!piKF0.TestBit(kKFIni)) {
1206 new(&piKF0) AliKFParticle(*trc0,q0>0 ? kPiPlus:kPiMinus);
1207 piKF0.SetBit(kKFIni);
1208 }
1209 new(&piKF1) AliKFParticle(*trc1,q0<0 ? kPiPlus:kPiMinus);
1210 k0KF.Initialize();
1211 k0KF += piKF0;
1212 k0KF += piKF1;
1213 k0KF.SetProductionVertex(vertexKF);
1214 k0KF.GetMass(mass,massErr);
1215 mass -= kK0Mass;
1216 if (TMath::Abs(mass)>fCutMassK0 || (massErr>0&&(abs(mass)>massErr*fCutMassK0NSigma))) break;
1217 if (k0KF.GetS()<fCutK0SFromDecay) break;
1218 k0KF.SetMassConstraint(kK0Mass,0.001);
1219 chi2c = (k0KF.GetNDF()!=0) ? k0KF.GetChi2()/k0KF.GetNDF() : 1000;
1220 if (chi2c>fCutChi2cK0) break;
1221 if (chi2c>bestChi2) break;
1222 bestChi2 = chi2c;
1223 bestID = it1;
1224 break;
1225 }
1226 // check K0 conversion hypothesis -----------------------------------------------------------<<<
1227 }
1228 //
1229 if (bestID>=0) {
1230 trc0->SetStatus(AliESDtrack::kMultInV0);
1231 fESDEvent->GetTrack(bestID)->SetStatus(AliESDtrack::kMultInV0);
1232 }
1233 }
1234 //
1235}
1236
1237//____________________________________________________________________
1238Bool_t AliITSMultReconstructor::CanBeElectron(const AliESDtrack* trc) const
1239{
1240 // check if the track can be electron
1241 Double_t pid[AliPID::kSPECIES];
1242 if (!trc->IsOn(AliESDtrack::kESDpid)) return kTRUE;
1243 trc->GetESDpid(pid);
1244 return (trc->IsOn(AliESDtrack::kTPCpid)) ?
1245 pid[AliPID::kElectron]>fCutMinElectronProbTPC :
1246 pid[AliPID::kElectron]>fCutMinElectronProbESD;
1247 //
1f9831ab 1248}