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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),
b9be2602 103fNSingleClusterSPD2(0),
f9f90134 104fDPhiWindow(0),
105fDThetaWindow(0),
fa9ed8e9 106fPhiShift(0),
7b116aa1 107fRemoveClustersFromOverlaps(0),
108fPhiOverlapCut(0),
109fZetaOverlapCut(0),
7c6da836 110fPhiRotationAngle(0),
f9f90134 111fScaleDTBySin2T(0),
112fNStdDev(1.0),
113fNStdDevSq(1.0),
6de485aa 114//
115fCutPxDrSPDin(0.1),
116fCutPxDrSPDout(0.15),
117fCutPxDz(0.2),
118fCutDCArz(0.5),
119fCutMinElectronProbTPC(0.5),
120fCutMinElectronProbESD(0.1),
121fCutMinP(0.05),
122fCutMinRGamma(2.),
123fCutMinRK0(1.),
124fCutMinPointAngle(0.98),
125fCutMaxDCADauther(0.5),
126fCutMassGamma(0.03),
127fCutMassGammaNSigma(5.),
128fCutMassK0(0.03),
129fCutMassK0NSigma(5.),
130fCutChi2cGamma(2.),
131fCutChi2cK0(2.),
132fCutGammaSFromDecay(-10.),
133fCutK0SFromDecay(-10.),
134fCutMaxDCA(1.),
135//
7537d03c 136fHistOn(0),
137fhClustersDPhiAcc(0),
138fhClustersDThetaAcc(0),
7537d03c 139fhClustersDPhiAll(0),
140fhClustersDThetaAll(0),
7537d03c 141fhDPhiVsDThetaAll(0),
142fhDPhiVsDThetaAcc(0),
7537d03c 143fhetaTracklets(0),
144fhphiTracklets(0),
145fhetaClustersLay1(0),
f9f90134 146fhphiClustersLay1(0),
147//
148 fDPhiShift(0),
149 fDPhiWindow2(0),
150 fDThetaWindow2(0),
151 fPartners(0),
152 fAssociatedLay1(0),
153 fMinDists(0),
154 fBlackList(0),
155//
156 fCreateClustersCopy(0),
157 fClustersLoaded(0),
158 fRecoDone(0),
e73fcfbb 159 fBuildRefs(kTRUE),
b9be2602 160 fStoreSPD2SingleCl(kFALSE),
f9f90134 161 fSPDSeg()
162{
b80c197e 163 // default c-tor
f9f90134 164 for (int i=0;i<2;i++) {
165 fNFiredChips[i] = 0;
166 fClArr[i] = 0;
167 for (int j=0;j<2;j++) fUsedClusLay[i][j] = 0;
168 fDetectorIndexClustersLay[i] = 0;
8fb89cdf 169 fClusterCopyIndex[i] = 0;
f9f90134 170 fOverlapFlagClustersLay[i] = 0;
171 fNClustersLay[i] = 0;
172 fClustersLay[i] = 0;
173 }
3ef75756 174 // Method to reconstruct the charged particles multiplicity with the
175 // SPD (tracklets).
f9f90134 176
ac903f1b 177 SetHistOn();
ac903f1b 178
e73fcfbb 179 if (AliITSReconstructor::GetRecoParam()) {
7b116aa1 180 SetPhiWindow(AliITSReconstructor::GetRecoParam()->GetTrackleterPhiWindow());
7284b2b2 181 SetThetaWindow(AliITSReconstructor::GetRecoParam()->GetTrackleterThetaWindow());
fa9ed8e9 182 SetPhiShift(AliITSReconstructor::GetRecoParam()->GetTrackleterPhiShift());
7b116aa1 183 SetRemoveClustersFromOverlaps(AliITSReconstructor::GetRecoParam()->GetTrackleterRemoveClustersFromOverlaps());
184 SetPhiOverlapCut(AliITSReconstructor::GetRecoParam()->GetTrackleterPhiOverlapCut());
185 SetZetaOverlapCut(AliITSReconstructor::GetRecoParam()->GetTrackleterZetaOverlapCut());
7c6da836 186 SetPhiRotationAngle(AliITSReconstructor::GetRecoParam()->GetTrackleterPhiRotationAngle());
f9f90134 187 SetNStdDev(AliITSReconstructor::GetRecoParam()->GetTrackleterNStdDevCut());
188 SetScaleDThetaBySin2T(AliITSReconstructor::GetRecoParam()->GetTrackleterScaleDThetaBySin2T());
e73fcfbb 189 SetBuildRefs(AliITSReconstructor::GetRecoParam()->GetTrackleterBuildCl2TrkRefs());
b9be2602 190 SetStoreSPD2SingleCl(AliITSReconstructor::GetRecoParam()->GetTrackleterStoreSPD2SingleCl());
6de485aa 191 //
192 SetCutPxDrSPDin(AliITSReconstructor::GetRecoParam()->GetMultCutPxDrSPDin());
193 SetCutPxDrSPDout(AliITSReconstructor::GetRecoParam()->GetMultCutPxDrSPDout());
194 SetCutPxDz(AliITSReconstructor::GetRecoParam()->GetMultCutPxDz());
195 SetCutDCArz(AliITSReconstructor::GetRecoParam()->GetMultCutDCArz());
196 SetCutMinElectronProbTPC(AliITSReconstructor::GetRecoParam()->GetMultCutMinElectronProbTPC());
197 SetCutMinElectronProbESD(AliITSReconstructor::GetRecoParam()->GetMultCutMinElectronProbESD());
198 SetCutMinP(AliITSReconstructor::GetRecoParam()->GetMultCutMinP());
199 SetCutMinRGamma(AliITSReconstructor::GetRecoParam()->GetMultCutMinRGamma());
200 SetCutMinRK0(AliITSReconstructor::GetRecoParam()->GetMultCutMinRK0());
201 SetCutMinPointAngle(AliITSReconstructor::GetRecoParam()->GetMultCutMinPointAngle());
202 SetCutMaxDCADauther(AliITSReconstructor::GetRecoParam()->GetMultCutMaxDCADauther());
203 SetCutMassGamma(AliITSReconstructor::GetRecoParam()->GetMultCutMassGamma());
204 SetCutMassGammaNSigma(AliITSReconstructor::GetRecoParam()->GetMultCutMassGammaNSigma());
205 SetCutMassK0(AliITSReconstructor::GetRecoParam()->GetMultCutMassK0());
206 SetCutMassK0NSigma(AliITSReconstructor::GetRecoParam()->GetMultCutMassK0NSigma());
207 SetCutChi2cGamma(AliITSReconstructor::GetRecoParam()->GetMultCutChi2cGamma());
208 SetCutChi2cK0(AliITSReconstructor::GetRecoParam()->GetMultCutChi2cK0());
209 SetCutGammaSFromDecay(AliITSReconstructor::GetRecoParam()->GetMultCutGammaSFromDecay());
210 SetCutK0SFromDecay(AliITSReconstructor::GetRecoParam()->GetMultCutK0SFromDecay());
211 SetCutMaxDCA(AliITSReconstructor::GetRecoParam()->GetMultCutMaxDCA());
212 //
7b116aa1 213 } else {
7b116aa1 214 SetPhiWindow();
7284b2b2 215 SetThetaWindow();
fa9ed8e9 216 SetPhiShift();
7b116aa1 217 SetRemoveClustersFromOverlaps();
218 SetPhiOverlapCut();
219 SetZetaOverlapCut();
7c6da836 220 SetPhiRotationAngle();
221
6de485aa 222 //
223 SetCutPxDrSPDin();
224 SetCutPxDrSPDout();
225 SetCutPxDz();
226 SetCutDCArz();
227 SetCutMinElectronProbTPC();
228 SetCutMinElectronProbESD();
229 SetCutMinP();
230 SetCutMinRGamma();
231 SetCutMinRK0();
232 SetCutMinPointAngle();
233 SetCutMaxDCADauther();
234 SetCutMassGamma();
235 SetCutMassGammaNSigma();
236 SetCutMassK0();
237 SetCutMassK0NSigma();
238 SetCutChi2cGamma();
239 SetCutChi2cK0();
240 SetCutGammaSFromDecay();
241 SetCutK0SFromDecay();
242 SetCutMaxDCA();
7b116aa1 243 }
f9f90134 244 //
fa9ed8e9 245 fTracklets = 0;
246 fSClusters = 0;
f9f90134 247 //
ac903f1b 248 // definition of histograms
fa9ed8e9 249 Bool_t oldStatus = TH1::AddDirectoryStatus();
250 TH1::AddDirectory(kFALSE);
251
7284b2b2 252 fhClustersDPhiAcc = new TH1F("dphiacc", "dphi", 100,-0.1,0.1);
ddced3c8 253 fhClustersDThetaAcc = new TH1F("dthetaacc","dtheta",100,-0.1,0.1);
ddced3c8 254
7284b2b2 255 fhDPhiVsDThetaAcc = new TH2F("dphiVsDthetaAcc","",100,-0.1,0.1,100,-0.1,0.1);
ac903f1b 256
02a95988 257 fhClustersDPhiAll = new TH1F("dphiall", "dphi", 100,0.0,0.5);
7284b2b2 258 fhClustersDThetaAll = new TH1F("dthetaall","dtheta",100,0.0,0.5);
ddced3c8 259
7284b2b2 260 fhDPhiVsDThetaAll = new TH2F("dphiVsDthetaAll","",100,0.,0.5,100,0.,0.5);
ddced3c8 261
262 fhetaTracklets = new TH1F("etaTracklets", "eta", 100,-2.,2.);
f606f16a 263 fhphiTracklets = new TH1F("phiTracklets", "phi", 100, 0., 2*TMath::Pi());
ddced3c8 264 fhetaClustersLay1 = new TH1F("etaClustersLay1", "etaCl1", 100,-2.,2.);
f606f16a 265 fhphiClustersLay1 = new TH1F("phiClustersLay1", "phiCl1", 100, 0., 2*TMath::Pi());
f9f90134 266 for (int i=2;i--;) fStoreRefs[i][0] = fStoreRefs[i][1] = kFALSE;
fa9ed8e9 267 TH1::AddDirectory(oldStatus);
ac903f1b 268}
ddced3c8 269
3ef75756 270//______________________________________________________________________
1f9831ab 271AliITSMultReconstructor::AliITSMultReconstructor(const AliITSMultReconstructor &mr) :
272AliTrackleter(mr),
f9f90134 273fDetTypeRec(0),fESDEvent(0),fTreeRP(0),fTreeRPMix(0),
1f9831ab 274fTracklets(0),
275fSClusters(0),
1f9831ab 276fNTracklets(0),
277fNSingleCluster(0),
b9be2602 278fNSingleClusterSPD2(0),
f9f90134 279fDPhiWindow(0),
280fDThetaWindow(0),
1f9831ab 281fPhiShift(0),
282fRemoveClustersFromOverlaps(0),
283fPhiOverlapCut(0),
284fZetaOverlapCut(0),
7c6da836 285fPhiRotationAngle(0),
f9f90134 286fScaleDTBySin2T(0),
287fNStdDev(1.0),
288fNStdDevSq(1.0),
6de485aa 289//
290fCutPxDrSPDin(0.1),
291fCutPxDrSPDout(0.15),
292fCutPxDz(0.2),
293fCutDCArz(0.5),
294fCutMinElectronProbTPC(0.5),
295fCutMinElectronProbESD(0.1),
296fCutMinP(0.05),
297fCutMinRGamma(2.),
298fCutMinRK0(1.),
299fCutMinPointAngle(0.98),
300fCutMaxDCADauther(0.5),
301fCutMassGamma(0.03),
302fCutMassGammaNSigma(5.),
303fCutMassK0(0.03),
304fCutMassK0NSigma(5.),
305fCutChi2cGamma(2.),
306fCutChi2cK0(2.),
307fCutGammaSFromDecay(-10.),
308fCutK0SFromDecay(-10.),
309fCutMaxDCA(1.),
310//
1f9831ab 311fHistOn(0),
312fhClustersDPhiAcc(0),
313fhClustersDThetaAcc(0),
314fhClustersDPhiAll(0),
315fhClustersDThetaAll(0),
316fhDPhiVsDThetaAll(0),
317fhDPhiVsDThetaAcc(0),
318fhetaTracklets(0),
319fhphiTracklets(0),
320fhetaClustersLay1(0),
f9f90134 321fhphiClustersLay1(0),
322fDPhiShift(0),
323fDPhiWindow2(0),
324fDThetaWindow2(0),
325fPartners(0),
326fAssociatedLay1(0),
327fMinDists(0),
328fBlackList(0),
329//
330fCreateClustersCopy(0),
331fClustersLoaded(0),
332fRecoDone(0),
e73fcfbb 333fBuildRefs(kTRUE),
b9be2602 334fStoreSPD2SingleCl(kFALSE),
f9f90134 335fSPDSeg()
1f9831ab 336 {
337 // Copy constructor :!!! RS ATTENTION: old c-tor reassigned the pointers instead of creating a new copy -> would crash on delete
338 AliError("May not use");
3ef75756 339}
340
341//______________________________________________________________________
7537d03c 342AliITSMultReconstructor& AliITSMultReconstructor::operator=(const AliITSMultReconstructor& mr){
3ef75756 343 // Assignment operator
1f9831ab 344 if (this != &mr) {
345 this->~AliITSMultReconstructor();
346 new(this) AliITSMultReconstructor(mr);
347 }
3ef75756 348 return *this;
349}
350
351//______________________________________________________________________
352AliITSMultReconstructor::~AliITSMultReconstructor(){
353 // Destructor
1ba5b31c 354
355 // delete histograms
356 delete fhClustersDPhiAcc;
357 delete fhClustersDThetaAcc;
1ba5b31c 358 delete fhClustersDPhiAll;
359 delete fhClustersDThetaAll;
1ba5b31c 360 delete fhDPhiVsDThetaAll;
361 delete fhDPhiVsDThetaAcc;
1ba5b31c 362 delete fhetaTracklets;
363 delete fhphiTracklets;
364 delete fhetaClustersLay1;
365 delete fhphiClustersLay1;
f9f90134 366 //
1f9831ab 367 // delete arrays
f9f90134 368 for(Int_t i=0; i<fNTracklets; i++) delete [] fTracklets[i];
fa9ed8e9 369
f9f90134 370 for(Int_t i=0; i<fNSingleCluster; i++) delete [] fSClusters[i];
371
372 //
373 for (int i=0;i<2;i++) {
374 delete[] fClustersLay[i];
375 delete[] fDetectorIndexClustersLay[i];
8fb89cdf 376 delete[] fClusterCopyIndex[i];
f9f90134 377 delete[] fOverlapFlagClustersLay[i];
378 delete fClArr[i];
f1b15b8d 379 for (int j=0;j<2;j++) delete fUsedClusLay[i][j];
f9f90134 380 }
1ba5b31c 381 delete [] fTracklets;
968e8539 382 delete [] fSClusters;
f9f90134 383 //
384 delete[] fPartners; fPartners = 0;
385 delete[] fMinDists; fMinDists = 0;
386 delete fBlackList; fBlackList = 0;
387 //
ddced3c8 388}
ac903f1b 389
390//____________________________________________________________________
1f9831ab 391void AliITSMultReconstructor::Reconstruct(AliESDEvent* esd, TTree* treeRP)
d7c5c1e4 392{
6873ed43 393 if (!treeRP) { AliError(" Invalid ITS cluster tree !\n"); return; }
394 if (!esd) {AliError("ESDEvent is not available, use old reconstructor"); return;}
ac903f1b 395 // reset counters
1f9831ab 396 if (fMult) delete fMult; fMult = 0;
f9f90134 397 fNClustersLay[0] = 0;
398 fNClustersLay[1] = 0;
1f9831ab 399 fNTracklets = 0;
400 fNSingleCluster = 0;
b9be2602 401 fNSingleClusterSPD2 = 0;
1f9831ab 402 //
1f9831ab 403 fESDEvent = esd;
404 fTreeRP = treeRP;
405 //
406 // >>>> RS: this part is equivalent to former AliITSVertexer::FindMultiplicity
407 //
408 // see if there is a SPD vertex
409 Bool_t isVtxOK=kTRUE, isCosmics=kFALSE;
410 AliESDVertex* vtx = (AliESDVertex*)fESDEvent->GetPrimaryVertexSPD();
7fdf95b0 411 if (!vtx || vtx->GetNContributors()<1) isVtxOK = kFALSE;
1f9831ab 412 if (vtx && strstr(vtx->GetTitle(),"cosmics")) {
413 isVtxOK = kFALSE;
414 isCosmics = kTRUE;
415 }
416 //
417 if (!isVtxOK) {
418 if (!isCosmics) {
419 AliDebug(1,"Tracklets multiplicity not determined because the primary vertex was not found");
420 AliDebug(1,"Just counting the number of cluster-fired chips on the SPD layers");
421 }
422 vtx = 0;
423 }
f39a4c9c 424 if(vtx){
2942f542 425 float vtxf[3] = {static_cast<float>(vtx->GetX()),static_cast<float>(vtx->GetY()),static_cast<float>(vtx->GetZ())};
f39a4c9c 426 FindTracklets(vtxf);
427 }
428 else {
429 FindTracklets(0);
430 }
1f9831ab 431 //
432 CreateMultiplicityObject();
433}
434
435//____________________________________________________________________
436void AliITSMultReconstructor::Reconstruct(TTree* clusterTree, Float_t* vtx, Float_t* /* vtxRes*/) {
437 //
f9f90134 438 // RS NOTE - this is old reconstructor invocation, to be used from VertexFinder and in analysis mode
d7c5c1e4 439
1f9831ab 440 if (fMult) delete fMult; fMult = 0;
f9f90134 441 fNClustersLay[0] = 0;
442 fNClustersLay[1] = 0;
ac903f1b 443 fNTracklets = 0;
7284b2b2 444 fNSingleCluster = 0;
b9be2602 445 fNSingleClusterSPD2 = 0;
1f9831ab 446 //
447 if (!clusterTree) { AliError(" Invalid ITS cluster tree !\n"); return; }
448 //
449 fESDEvent = 0;
f9f90134 450 SetTreeRP(clusterTree);
1f9831ab 451 //
452 FindTracklets(vtx);
453 //
454}
7284b2b2 455
f9f90134 456
1f9831ab 457//____________________________________________________________________
b80c197e 458void AliITSMultReconstructor::ReconstructMix(TTree* clusterTree, TTree* clusterTreeMix, const Float_t* vtx, Float_t*)
1f9831ab 459{
f9f90134 460 //
461 // RS NOTE - this is old reconstructor invocation, to be used from VertexFinder and in analysis mode
d7c5c1e4 462
f9f90134 463 if (fMult) delete fMult; fMult = 0;
464 fNClustersLay[0] = 0;
465 fNClustersLay[1] = 0;
466 fNTracklets = 0;
467 fNSingleCluster = 0;
b9be2602 468 fNSingleClusterSPD2 = 0;
f9f90134 469 //
470 if (!clusterTree) { AliError(" Invalid ITS cluster tree !\n"); return; }
471 if (!clusterTreeMix) { AliError(" Invalid ITS cluster tree 2nd event !\n"); return; }
472 //
473 fESDEvent = 0;
474 SetTreeRP(clusterTree);
475 SetTreeRPMix(clusterTreeMix);
476 //
477 FindTracklets(vtx);
478 //
479}
480
481
482//____________________________________________________________________
483void AliITSMultReconstructor::FindTracklets(const Float_t *vtx)
484{
d7c5c1e4 485 // - calls LoadClusterArrays that finds the position of the clusters
486 // (in global coord)
f9f90134 487
d7c5c1e4 488 // - convert the cluster coordinates to theta, phi (seen from the
7c6da836 489 // interaction vertex). Clusters in the inner layer can be now
490 // rotated for combinatorial studies
d7c5c1e4 491 // - makes an array of tracklets
492 //
493 // After this method has been called, the clusters of the two layers
494 // and the tracklets can be retrieved by calling the Get'er methods.
495
496
1f9831ab 497 // Find tracklets converging to vertex
498 //
f9f90134 499 LoadClusterArrays(fTreeRP,fTreeRPMix);
1f9831ab 500 // flag clusters used by ESD tracks
6873ed43 501 if (fESDEvent) ProcessESDTracks();
f9f90134 502 fRecoDone = kTRUE;
1f9831ab 503
504 if (!vtx) return;
3ef75756 505
f9f90134 506 InitAux();
fa9ed8e9 507
ac903f1b 508 // find the tracklets
509 AliDebug(1,"Looking for tracklets... ");
fa9ed8e9 510
f9f90134 511 ClusterPos2Angles(vtx); // convert cluster position to angles wrt vtx
512 //
513 // Step1: find all tracklets allowing double assocation:
514 int found = 1;
7284b2b2 515 while (found > 0) {
7284b2b2 516 found = 0;
f9f90134 517 for (Int_t iC1=0; iC1<fNClustersLay[0]; iC1++) found += AssociateClusterOfL1(iC1);
7284b2b2 518 }
f9f90134 519 //
520 // Step2: store tracklets; remove used clusters
521 for (Int_t iC2=0; iC2<fNClustersLay[1]; iC2++) StoreTrackletForL2Cluster(iC2);
522 //
b9be2602 523 // store unused single clusters of L1 (optionally for L2 too)
f9f90134 524 StoreL1Singles();
525 //
ac903f1b 526 AliDebug(1,Form("%d tracklets found", fNTracklets));
527}
528
529//____________________________________________________________________
1f9831ab 530void AliITSMultReconstructor::CreateMultiplicityObject()
531{
532 // create AliMultiplicity object and store it in the ESD event
533 //
534 TBits fastOrFiredMap,firedChipMap;
535 if (fDetTypeRec) {
536 fastOrFiredMap = fDetTypeRec->GetFastOrFiredMap();
537 firedChipMap = fDetTypeRec->GetFiredChipMap(fTreeRP);
538 }
539 //
540 fMult = new AliMultiplicity(fNTracklets,fNSingleCluster,fNFiredChips[0],fNFiredChips[1],fastOrFiredMap);
e73fcfbb 541 fMult->SetMultTrackRefs( fBuildRefs );
b9be2602 542 fMult->SetSPD2SinglesStored(fStoreSPD2SingleCl);
543 fMult->SetNumberOfSingleClustersSPD2(fNSingleClusterSPD2);
f9f90134 544 // store some details of reco:
545 fMult->SetScaleDThetaBySin2T(fScaleDTBySin2T);
546 fMult->SetDPhiWindow2(fDPhiWindow2);
547 fMult->SetDThetaWindow2(fDThetaWindow2);
548 fMult->SetDPhiShift(fDPhiShift);
549 fMult->SetNStdDev(fNStdDev);
550 //
1f9831ab 551 fMult->SetFiredChipMap(firedChipMap);
552 AliITSRecPointContainer* rcont = AliITSRecPointContainer::Instance();
553 fMult->SetITSClusters(0,rcont->GetNClustersInLayer(1,fTreeRP));
554 for(Int_t kk=2;kk<=6;kk++) fMult->SetITSClusters(kk-1,rcont->GetNClustersInLayerFast(kk));
555 //
f9f90134 556 UInt_t shared[100];
557 AliRefArray *refs[2][2] = {{0,0},{0,0}};
e73fcfbb 558 if (fBuildRefs) {
559 for (int il=2;il--;)
560 for (int it=2;it--;) // tracklet_clusters->track references to stor
561 if (fStoreRefs[il][it]) refs[il][it] = new AliRefArray(fNTracklets,0);
562 }
f9f90134 563 //
1f9831ab 564 for (int i=fNTracklets;i--;) {
565 float* tlInfo = fTracklets[i];
f9f90134 566 fMult->SetTrackletData(i,tlInfo);
e73fcfbb 567 //
568 if (!fBuildRefs) continue; // do we need references?
f9f90134 569 for (int itp=0;itp<2;itp++) {
570 for (int ilr=0;ilr<2;ilr++) {
571 if (!fStoreRefs[ilr][itp]) continue; // nothing to store
572 int clID = int(tlInfo[ilr ? kClID2:kClID1]);
573 int nref = fUsedClusLay[ilr][itp]->GetReferences(clID,shared,100);
574 if (!nref) continue;
575 else if (nref==1) refs[ilr][itp]->AddReference(i,shared[0]);
576 else refs[ilr][itp]->AddReferences(i,shared,nref);
577 }
578 }
1f9831ab 579 }
e73fcfbb 580 if (fBuildRefs) fMult->AttachTracklet2TrackRefs(refs[0][0],refs[0][1],refs[1][0],refs[1][1]);
f9f90134 581 //
582 AliRefArray *refsc[2] = {0,0};
e73fcfbb 583 if (fBuildRefs) for (int it=2;it--;) if (fStoreRefs[0][it]) refsc[it] = new AliRefArray(fNClustersLay[0]);
1f9831ab 584 for (int i=fNSingleCluster;i--;) {
585 float* clInfo = fSClusters[i];
f9f90134 586 fMult->SetSingleClusterData(i,clInfo);
e73fcfbb 587 //
588 if (!fBuildRefs) continue; // do we need references?
b9be2602 589 int ilr = i>=(fNSingleCluster-fNSingleClusterSPD2) ? 1:0;
f9f90134 590 int clID = int(clInfo[kSCID]);
591 for (int itp=0;itp<2;itp++) {
b9be2602 592 if (!fStoreRefs[ilr][itp]) continue;
593 int nref = fUsedClusLay[ilr][itp]->GetReferences(clID,shared,100);
f9f90134 594 if (!nref) continue;
595 else if (nref==1) refsc[itp]->AddReference(i,shared[0]);
596 else refsc[itp]->AddReferences(i,shared,nref);
597 }
1f9831ab 598 }
b9be2602 599 //
e73fcfbb 600 if (fBuildRefs) fMult->AttachCluster2TrackRefs(refsc[0],refsc[1]);
1f9831ab 601 fMult->CompactBits();
602 //
603}
604
605
606//____________________________________________________________________
f9f90134 607void AliITSMultReconstructor::LoadClusterArrays(TTree* tree, TTree* treeMix)
608{
609 // load cluster info and prepare tracklets arrays
610 //
611 if (AreClustersLoaded()) {AliInfo("Clusters are already loaded"); return;}
612 LoadClusterArrays(tree,0);
613 LoadClusterArrays(treeMix ? treeMix:tree,1);
614 int nmaxT = TMath::Min(fNClustersLay[0], fNClustersLay[1]);
615 if (fTracklets) delete[] fTracklets;
616 fTracklets = new Float_t*[nmaxT];
617 memset(fTracklets,0,nmaxT*sizeof(Float_t*));
618 //
619 if (fSClusters) delete[] fSClusters;
b9be2602 620 int nSlots = GetStoreSPD2SingleCl() ? fNClustersLay[0]+fNClustersLay[1] : fNClustersLay[0];
621 fSClusters = new Float_t*[nSlots];
622 memset(fSClusters,0,nSlots*sizeof(Float_t*));
f9f90134 623 //
624 AliDebug(1,Form("(clusters in layer 1 : %d, layer 2: %d)",fNClustersLay[0],fNClustersLay[1]));
625 AliDebug(1,Form("(cluster-fired chips in layer 1 : %d, layer 2: %d)",fNFiredChips[0],fNFiredChips[1]));
626 SetClustersLoaded();
627}
628
629//____________________________________________________________________
630void AliITSMultReconstructor::LoadClusterArrays(TTree* itsClusterTree, int il)
1f9831ab 631{
ac903f1b 632 // This method
f9f90134 633 // - gets the clusters from the cluster tree for layer il
ac903f1b 634 // - convert them into global coordinates
635 // - store them in the internal arrays
9b373e9a 636 // - count the number of cluster-fired chips
1f9831ab 637 //
d7c5c1e4 638 // RS: This method was strongly modified wrt original. In order to have the same numbering
1f9831ab 639 // of clusters as in the ITS reco I had to introduce sorting in Z
640 // Also note that now the clusters data are stored not in float[6] attached to float**, but in 1-D array
f9f90134 641 AliDebug(1,Form("Loading clusters and cluster-fired chips for layer %d",il));
642 //
643 fNClustersLay[il] = 0;
644 fNFiredChips[il] = 0;
645 for (int i=2;i--;) fStoreRefs[il][i] = kFALSE;
646 //
647 AliITSRecPointContainer* rpcont = 0;
648 static TClonesArray statITSrec("AliITSRecPoint");
649 static TObjArray clArr(100);
650 TBranch* branch = 0;
651 TClonesArray* itsClusters = 0;
652 //
653 if (!fCreateClustersCopy) {
654 rpcont=AliITSRecPointContainer::Instance();
655 itsClusters = rpcont->FetchClusters(0,itsClusterTree);
656 if(!rpcont->IsSPDActive()){
657 AliWarning("No SPD rec points found, multiplicity not calculated");
658 return;
659 }
660 }
661 else {
662 itsClusters = &statITSrec;
663 branch = itsClusterTree->GetBranch("ITSRecPoints");
664 branch->SetAddress(&itsClusters);
665 if (!fClArr[il]) fClArr[il] = new TClonesArray("AliITSRecPoint",100);
9cb64105 666 delete[] fClusterCopyIndex[il];
f9f90134 667 }
1f9831ab 668 //
fa9ed8e9 669 // count clusters
b21c1af0 670 // loop over the SPD subdetectors
f9f90134 671 int nclLayer = 0;
5afb5e80 672 int detMin = TMath::Max(0,AliITSgeomTGeo::GetModuleIndex(il+1,1,1));
f9f90134 673 int detMax = AliITSgeomTGeo::GetModuleIndex(il+2,1,1);
674 for (int idt=detMin;idt<detMax;idt++) {
675 if (!fCreateClustersCopy) itsClusters = rpcont->UncheckedGetClusters(idt);
676 else branch->GetEvent(idt);
677 int nClusters = itsClusters->GetEntriesFast();
678 if (!nClusters) continue;
679 Int_t nClustersInChip[5] = {0,0,0,0,0};
680 while(nClusters--) {
681 AliITSRecPoint* cluster = (AliITSRecPoint*)itsClusters->UncheckedAt(nClusters);
682 if (!cluster) continue;
778c8b71 683 if (fCreateClustersCopy) cluster = new ((*fClArr[il])[nclLayer]) AliITSRecPoint(*cluster);
f9f90134 684 clArr.AddAtAndExpand(cluster,nclLayer++);
5afb5e80 685 Int_t chipNo = fSPDSeg.GetChipFromLocal(0,cluster->GetDetLocalZ());
686 if(chipNo>=0)nClustersInChip[ chipNo ]++;
1f9831ab 687 }
f9f90134 688 for(Int_t ifChip=5;ifChip--;) if (nClustersInChip[ifChip]) fNFiredChips[il]++;
1f9831ab 689 }
f9f90134 690 // sort the clusters in Z (to have the same numbering as in ITS reco
691 Float_t *z = new Float_t[nclLayer];
692 Int_t *index = new Int_t[nclLayer];
693 for (int ic=0;ic<nclLayer;ic++) z[ic] = ((AliITSRecPoint*)clArr[ic])->GetZ();
694 TMath::Sort(nclLayer,z,index,kFALSE);
695 Float_t* clustersLay = new Float_t[nclLayer*kClNPar];
696 Int_t* detectorIndexClustersLay = new Int_t[nclLayer];
697 Bool_t* overlapFlagClustersLay = new Bool_t[nclLayer];
9cb64105 698 if (fCreateClustersCopy) fClusterCopyIndex[il] = new Int_t[nclLayer];
1f9831ab 699 //
f9f90134 700 for (int ic=0;ic<nclLayer;ic++) {
701 AliITSRecPoint* cluster = (AliITSRecPoint*)clArr[index[ic]];
702 float* clPar = &clustersLay[ic*kClNPar];
703 //
704 cluster->GetGlobalXYZ( clPar );
705 detectorIndexClustersLay[ic] = cluster->GetDetectorIndex();
706 overlapFlagClustersLay[ic] = kFALSE;
707 for (Int_t i=3;i--;) clPar[kClMC0+i] = cluster->GetLabel(i);
9cb64105 708 if (fCreateClustersCopy) fClusterCopyIndex[il][ic] = index[ic];
f9f90134 709 }
710 clArr.Clear();
711 delete[] z;
712 delete[] index;
713 //
714 if (fOverlapFlagClustersLay[il]) delete[] fOverlapFlagClustersLay[il];
715 fOverlapFlagClustersLay[il] = overlapFlagClustersLay;
716 //
717 if (fDetectorIndexClustersLay[il]) delete[] fDetectorIndexClustersLay[il];
718 fDetectorIndexClustersLay[il] = detectorIndexClustersLay;
719 //
e73fcfbb 720 if (fBuildRefs) {
721 for (int it=0;it<2;it++) {
722 if (fUsedClusLay[il][it]) delete fUsedClusLay[il][it];
723 fUsedClusLay[il][it] = new AliRefArray(nclLayer);
724 }
f9f90134 725 }
726 //
727 if (fClustersLay[il]) delete[] fClustersLay[il];
728 fClustersLay[il] = clustersLay;
729 fNClustersLay[il] = nclLayer;
1f9831ab 730 //
9b373e9a 731}
f9f90134 732
9b373e9a 733//____________________________________________________________________
f9f90134 734void AliITSMultReconstructor::LoadClusterFiredChips(TTree* itsClusterTree) {
d7c5c1e4 735 // This method
9b373e9a 736 // - gets the clusters from the cluster tree
737 // - counts the number of (cluster)fired chips
738
739 AliDebug(1,"Loading cluster-fired chips ...");
740
741 fNFiredChips[0] = 0;
742 fNFiredChips[1] = 0;
743
b21c1af0 744 AliITSRecPointContainer* rpcont=AliITSRecPointContainer::Instance();
5afb5e80 745 TClonesArray* itsClusters=NULL;
746 rpcont->FetchClusters(0,itsClusterTree);
b21c1af0 747 if(!rpcont->IsSPDActive()){
748 AliWarning("No SPD rec points found, multiplicity not calculated");
749 return;
750 }
9b373e9a 751
9b373e9a 752 // loop over the its subdetectors
b21c1af0 753 Int_t nSPDmodules=AliITSgeomTGeo::GetModuleIndex(3,1,1);
754 for (Int_t iIts=0; iIts < nSPDmodules; iIts++) {
755 itsClusters=rpcont->UncheckedGetClusters(iIts);
9b373e9a 756 Int_t nClusters = itsClusters->GetEntriesFast();
757
758 // number of clusters in each chip of the current module
759 Int_t nClustersInChip[5] = {0,0,0,0,0};
760 Int_t layer = 0;
8fd16b94 761 Int_t ladder=0;
762 Int_t det=0;
763 AliITSgeomTGeo::GetModuleId(iIts,layer,ladder,det);
764 --layer; // layer is from 1 to 6 in AliITSgeomTGeo, but from 0 to 5 here
765 if(layer<0 || layer >1)continue;
9b373e9a 766
767 // loop over clusters
768 while(nClusters--) {
769 AliITSRecPoint* cluster = (AliITSRecPoint*)itsClusters->UncheckedAt(nClusters);
8fd16b94 770
9b373e9a 771 // find the chip for the current cluster
772 Float_t locz = cluster->GetDetLocalZ();
f9f90134 773 Int_t iChip = fSPDSeg.GetChipFromLocal(0,locz);
e9b15b0c 774 if (iChip>=0) nClustersInChip[iChip]++;
9b373e9a 775
776 }// end of cluster loop
777
778 // get number of fired chips in the current module
9b373e9a 779 for(Int_t ifChip=0; ifChip<5; ifChip++) {
780 if(nClustersInChip[ifChip] >= 1) fNFiredChips[layer]++;
781 }
782
783 } // end of its "subdetector" loop
784
b21c1af0 785
9b373e9a 786 AliDebug(1,Form("(cluster-fired chips in layer 1 : %d, layer 2: %d)",fNFiredChips[0],fNFiredChips[1]));
ac903f1b 787}
788//____________________________________________________________________
789void
790AliITSMultReconstructor::SaveHists() {
3ef75756 791 // This method save the histograms on the output file
792 // (only if fHistOn is TRUE).
ac903f1b 793
794 if (!fHistOn)
795 return;
796
ddced3c8 797 fhClustersDPhiAll->Write();
798 fhClustersDThetaAll->Write();
ac903f1b 799 fhDPhiVsDThetaAll->Write();
ddced3c8 800
801 fhClustersDPhiAcc->Write();
802 fhClustersDThetaAcc->Write();
ac903f1b 803 fhDPhiVsDThetaAcc->Write();
ddced3c8 804
805 fhetaTracklets->Write();
806 fhphiTracklets->Write();
807 fhetaClustersLay1->Write();
808 fhphiClustersLay1->Write();
ac903f1b 809}
7b116aa1 810
811//____________________________________________________________________
b80c197e 812void AliITSMultReconstructor::FlagClustersInOverlapRegions (Int_t iC1, Int_t iC2WithBestDist)
813{
814 // Flags clusters in the overlapping regions
7b116aa1 815 Float_t distClSameMod=0.;
816 Float_t distClSameModMin=0.;
817 Int_t iClOverlap =0;
818 Float_t meanRadiusLay1 = 3.99335; // average radius inner layer
819 Float_t meanRadiusLay2 = 7.37935; // average radius outer layer;
820
821 Float_t zproj1=0.;
822 Float_t zproj2=0.;
823 Float_t deZproj=0.;
1f9831ab 824 Float_t* clPar1 = GetClusterLayer1(iC1);
825 Float_t* clPar2B = GetClusterLayer2(iC2WithBestDist);
7b116aa1 826 // Loop on inner layer clusters
f9f90134 827 for (Int_t iiC1=0; iiC1<fNClustersLay[0]; iiC1++) {
828 if (!fOverlapFlagClustersLay[0][iiC1]) {
7b116aa1 829 // only for adjacent modules
f9f90134 830 if ((TMath::Abs(fDetectorIndexClustersLay[0][iC1]-fDetectorIndexClustersLay[0][iiC1])==4)||
831 (TMath::Abs(fDetectorIndexClustersLay[0][iC1]-fDetectorIndexClustersLay[0][iiC1])==76)) {
1f9831ab 832 Float_t *clPar11 = GetClusterLayer1(iiC1);
833 Float_t dePhi=TMath::Abs(clPar11[kClPh]-clPar1[kClPh]);
7b116aa1 834 if (dePhi>TMath::Pi()) dePhi=2.*TMath::Pi()-dePhi;
835
1f9831ab 836 zproj1=meanRadiusLay1/TMath::Tan(clPar1[kClTh]);
837 zproj2=meanRadiusLay1/TMath::Tan(clPar11[kClTh]);
7b116aa1 838
839 deZproj=TMath::Abs(zproj1-zproj2);
840
841 distClSameMod = TMath::Sqrt(TMath::Power(deZproj/fZetaOverlapCut,2)+TMath::Power(dePhi/fPhiOverlapCut,2));
f9f90134 842 if (distClSameMod<=1.) fOverlapFlagClustersLay[0][iiC1]=kTRUE;
7b116aa1 843
844// if (distClSameMod<=1.) {
845// if (distClSameModMin==0. || distClSameMod<distClSameModMin) {
846// distClSameModMin=distClSameMod;
847// iClOverlap=iiC1;
848// }
849// }
850
851
852 } // end adjacent modules
853 }
854 } // end Loop on inner layer clusters
855
f9f90134 856// if (distClSameModMin!=0.) fOverlapFlagClustersLay[0][iClOverlap]=kTRUE;
7b116aa1 857
858 distClSameMod=0.;
859 distClSameModMin=0.;
860 iClOverlap =0;
861 // Loop on outer layer clusters
f9f90134 862 for (Int_t iiC2=0; iiC2<fNClustersLay[1]; iiC2++) {
863 if (!fOverlapFlagClustersLay[1][iiC2]) {
7b116aa1 864 // only for adjacent modules
1f9831ab 865 Float_t *clPar2 = GetClusterLayer2(iiC2);
f9f90134 866 if ((TMath::Abs(fDetectorIndexClustersLay[1][iC2WithBestDist]-fDetectorIndexClustersLay[1][iiC2])==4) ||
867 (TMath::Abs(fDetectorIndexClustersLay[1][iC2WithBestDist]-fDetectorIndexClustersLay[1][iiC2])==156)) {
1f9831ab 868 Float_t dePhi=TMath::Abs(clPar2[kClPh]-clPar2B[kClPh]);
7b116aa1 869 if (dePhi>TMath::Pi()) dePhi=2.*TMath::Pi()-dePhi;
870
1f9831ab 871 zproj1=meanRadiusLay2/TMath::Tan(clPar2B[kClTh]);
872 zproj2=meanRadiusLay2/TMath::Tan(clPar2[kClTh]);
7b116aa1 873
874 deZproj=TMath::Abs(zproj1-zproj2);
875 distClSameMod = TMath::Sqrt(TMath::Power(deZproj/fZetaOverlapCut,2)+TMath::Power(dePhi/fPhiOverlapCut,2));
f9f90134 876 if (distClSameMod<=1.) fOverlapFlagClustersLay[1][iiC2]=kTRUE;
7b116aa1 877
878// if (distClSameMod<=1.) {
879// if (distClSameModMin==0. || distClSameMod<distClSameModMin) {
880// distClSameModMin=distClSameMod;
881// iClOverlap=iiC2;
882// }
883// }
884
885 } // end adjacent modules
886 }
887 } // end Loop on outer layer clusters
888
f9f90134 889// if (distClSameModMin!=0.) fOverlapFlagClustersLay[1][iClOverlap]=kTRUE;
7b116aa1 890
6b489238 891}
1f9831ab 892
f9f90134 893//____________________________________________________________________
894void AliITSMultReconstructor::InitAux()
895{
896 // init arrays/parameters for tracklet reconstruction
897
898 // dPhi shift is field dependent, get average magnetic field
899 Float_t bz = 0;
900 AliMagF* field = 0;
901 if (TGeoGlobalMagField::Instance()) field = dynamic_cast<AliMagF*>(TGeoGlobalMagField::Instance()->GetField());
902 if (!field) {
903 AliError("Could not retrieve magnetic field. Assuming no field. Delta Phi shift will be deactivated in AliITSMultReconstructor.");
904 }
905 else bz = TMath::Abs(field->SolenoidField());
906 fDPhiShift = fPhiShift / 5 * bz;
907 AliDebug(1, Form("Using phi shift of %f", fDPhiShift));
908 //
909 if (fPartners) delete[] fPartners; fPartners = new Int_t[fNClustersLay[1]];
910 if (fMinDists) delete[] fMinDists; fMinDists = new Float_t[fNClustersLay[1]];
911 if (fAssociatedLay1) delete[] fAssociatedLay1; fAssociatedLay1 = new Int_t[fNClustersLay[0]];
912 //
913 if (fBlackList) delete fBlackList; fBlackList = new AliRefArray(fNClustersLay[0]);
914 //
915 // Printf("Vertex in find tracklets...%f %f %f",vtx[0],vtx[1],vtx[2]);
916 for (Int_t i=0; i<fNClustersLay[1]; i++) {
917 fPartners[i] = -1;
918 fMinDists[i] = 2*fNStdDev;
919 }
920 memset(fAssociatedLay1,0,fNClustersLay[0]*sizeof(Int_t));
921 //
922}
923
924//____________________________________________________________________
925void AliITSMultReconstructor::ClusterPos2Angles(const Float_t *vtx)
926{
927 // convert cluster coordinates to angles wrt vertex
928 for (int ilr=0;ilr<2;ilr++) {
929 for (Int_t iC=0; iC<fNClustersLay[ilr]; iC++) {
930 float* clPar = GetClusterOfLayer(ilr,iC);
931 CalcThetaPhi(clPar[kClTh]-vtx[0],clPar[kClPh]-vtx[1],clPar[kClZ]-vtx[2],clPar[kClTh],clPar[kClPh]);
932 if (ilr==0) {
933 clPar[kClPh] = clPar[kClPh] + fPhiRotationAngle; // rotation of inner layer for comb studies
934 if (fHistOn) {
935 Float_t eta = clPar[kClTh];
936 eta= TMath::Tan(eta/2.);
937 eta=-TMath::Log(eta);
938 fhetaClustersLay1->Fill(eta);
939 fhphiClustersLay1->Fill(clPar[kClPh]);
940 }
941 }
942 }
943 }
944 //
945}
946
947//____________________________________________________________________
948Int_t AliITSMultReconstructor::AssociateClusterOfL1(Int_t iC1)
949{
950 // search association of cluster iC1 of L1 with all clusters of L2
951 if (fAssociatedLay1[iC1] != 0) return 0;
952 Int_t iC2WithBestDist = -1; // reset
953 Double_t minDist = 2*fNStdDev; // reset
954 float* clPar1 = GetClusterLayer1(iC1);
955 for (Int_t iC2=0; iC2<fNClustersLay[1]; iC2++) {
956 //
957 if (fBlackList->IsReferred(iC1,iC2)) continue;
958 float* clPar2 = GetClusterLayer2(iC2);
959 //
960 // find the difference in angles
961 Double_t dTheta = TMath::Abs(clPar2[kClTh] - clPar1[kClTh]);
962 Double_t dPhi = TMath::Abs(clPar2[kClPh] - clPar1[kClPh]);
963 // Printf("detheta %f dephi %f", dTheta,dPhi);
964 //
965 if (dPhi>TMath::Pi()) dPhi=2.*TMath::Pi()-dPhi; // take into account boundary condition
966 //
967 if (fHistOn) {
968 fhClustersDPhiAll->Fill(dPhi);
969 fhClustersDThetaAll->Fill(dTheta);
970 fhDPhiVsDThetaAll->Fill(dTheta, dPhi);
971 }
972 Float_t d = CalcDist(dPhi,dTheta,clPar1[kClTh]); // make "elliptical" cut in Phi and Theta!
973 // look for the minimum distance: the minimum is in iC2WithBestDist
974 if (d<fNStdDev && d<minDist) { minDist=d; iC2WithBestDist = iC2; }
975 }
976 //
977 if (minDist<fNStdDev) { // This means that a cluster in layer 2 was found that matches with iC1
978 //
979 if (fMinDists[iC2WithBestDist] > minDist) {
980 Int_t oldPartner = fPartners[iC2WithBestDist];
981 fPartners[iC2WithBestDist] = iC1;
982 fMinDists[iC2WithBestDist] = minDist;
983 //
984 fAssociatedLay1[iC1] = 1; // mark as assigned
985 //
986 if (oldPartner != -1) {
987 // redo partner search for cluster in L0 (oldPartner), putting this one (iC2WithBestDist) on its fBlackList
988 fBlackList->AddReference(oldPartner,iC2WithBestDist);
989 fAssociatedLay1[oldPartner] = 0; // mark as free
990 }
991 } else {
992 // try again to find a cluster without considering iC2WithBestDist
993 fBlackList->AddReference(iC1,iC2WithBestDist);
994 }
995 //
996 }
997 else fAssociatedLay1[iC1] = 2;// cluster has no partner; remove
998 //
999 return 1;
1000}
1001
1002//____________________________________________________________________
1003Int_t AliITSMultReconstructor::StoreTrackletForL2Cluster(Int_t iC2)
1004{
1005 // build tracklet for cluster iC2 of layer 2
1006 if (fPartners[iC2] == -1) return 0;
1007 if (fRemoveClustersFromOverlaps) FlagClustersInOverlapRegions (fPartners[iC2],iC2);
1008 // Printf("saving tracklets");
1009 if (fOverlapFlagClustersLay[0][fPartners[iC2]] || fOverlapFlagClustersLay[1][iC2]) return 0;
1010 float* clPar2 = GetClusterLayer2(iC2);
1011 float* clPar1 = GetClusterLayer1(fPartners[iC2]);
1012 //
1013 Float_t* tracklet = fTracklets[fNTracklets] = new Float_t[kTrNPar]; // RS Add also the cluster id's
1014 //
1015 tracklet[kTrTheta] = clPar1[kClTh]; // use the theta from the clusters in the first layer
1016 tracklet[kTrPhi] = clPar1[kClPh]; // use the phi from the clusters in the first layer
1017 tracklet[kTrDPhi] = clPar1[kClPh] - clPar2[kClPh]; // store the difference between phi1 and phi2
1018 //
1019 // define dphi in the range [0,pi] with proper sign (track charge correlated)
1020 if (tracklet[kTrDPhi] > TMath::Pi()) tracklet[kTrDPhi] = tracklet[kTrDPhi]-2.*TMath::Pi();
1021 if (tracklet[kTrDPhi] < -TMath::Pi()) tracklet[kTrDPhi] = tracklet[kTrDPhi]+2.*TMath::Pi();
1022 //
1023 tracklet[kTrDTheta] = clPar1[kClTh] - clPar2[kClTh]; // store the theta1-theta2
1024 //
1025 if (fHistOn) {
1026 fhClustersDPhiAcc->Fill(tracklet[kTrDPhi]);
1027 fhClustersDThetaAcc->Fill(tracklet[kTrDTheta]);
1028 fhDPhiVsDThetaAcc->Fill(tracklet[kTrDTheta],tracklet[kTrDPhi]);
1029 }
1030 //
1031 // find label
1032 // if equal label in both clusters found this label is assigned
1033 // if no equal label can be found the first labels of the L1 AND L2 cluster are assigned
1034 Int_t label1=0,label2=0;
1035 while (label2 < 3) {
1036 if ( int(clPar1[kClMC0+label1])!=-2 && int(clPar1[kClMC0+label1])==int(clPar2[kClMC0+label2])) break;
1037 if (++label1 == 3) { label1 = 0; label2++; }
1038 }
1039 if (label2 < 3) {
1040 AliDebug(AliLog::kDebug, Form("Found label %d == %d for tracklet candidate %d\n",
1041 (Int_t) clPar1[kClMC0+label1], (Int_t) clPar1[kClMC0+label2], fNTracklets));
1042 tracklet[kTrLab1] = tracklet[kTrLab2] = clPar1[kClMC0+label1];
1043 } else {
1044 AliDebug(AliLog::kDebug, Form("Did not find label %d %d %d %d %d %d for tracklet candidate %d\n",
1045 (Int_t) clPar1[kClMC0], (Int_t) clPar1[kClMC1], (Int_t) clPar1[kClMC2],
1046 (Int_t) clPar2[kClMC0], (Int_t) clPar2[kClMC1], (Int_t) clPar2[kClMC2], fNTracklets));
1047 tracklet[kTrLab1] = clPar1[kClMC0];
1048 tracklet[kTrLab2] = clPar2[kClMC0];
1049 }
1050 //
1051 if (fHistOn) {
1052 Float_t eta = tracklet[kTrTheta];
1053 eta= TMath::Tan(eta/2.);
1054 eta=-TMath::Log(eta);
1055 fhetaTracklets->Fill(eta);
1056 fhphiTracklets->Fill(tracklet[kTrPhi]);
1057 }
1058 //
1059 tracklet[kClID1] = fPartners[iC2];
1060 tracklet[kClID2] = iC2;
1061 //
1062 // Printf("Adding tracklet candidate");
1063 AliDebug(1,Form(" Adding tracklet candidate %d ", fNTracklets));
1064 AliDebug(1,Form(" Cl. %d of Layer 1 and %d of Layer 2", fPartners[iC2], iC2));
1065 fNTracklets++;
1066 fAssociatedLay1[fPartners[iC2]] = 1;
1067 //
1068 return 1;
1069}
1070
1071//____________________________________________________________________
1072void AliITSMultReconstructor::StoreL1Singles()
1073{
1074 // Printf("saving single clusters...");
1075 for (Int_t iC1=0; iC1<fNClustersLay[0]; iC1++) {
1076 float* clPar1 = GetClusterLayer1(iC1);
1077 if (fAssociatedLay1[iC1]==2||fAssociatedLay1[iC1]==0) {
1078 fSClusters[fNSingleCluster] = new Float_t[kClNPar];
1079 fSClusters[fNSingleCluster][kSCTh] = clPar1[kClTh];
1080 fSClusters[fNSingleCluster][kSCPh] = clPar1[kClPh];
1081 fSClusters[fNSingleCluster][kSCLab] = clPar1[kClMC0];
1082 fSClusters[fNSingleCluster][kSCID] = iC1;
1083 AliDebug(1,Form(" Adding a single cluster %d (cluster %d of layer 1)",
1084 fNSingleCluster, iC1));
1085 fNSingleCluster++;
1086 }
1087 }
1088 //
b9be2602 1089 if (GetStoreSPD2SingleCl()) {
1090 for (Int_t iC2=0; iC2<fNClustersLay[1]; iC2++) {
1091 if (fPartners[iC2]<0 || (fOverlapFlagClustersLay[0][fPartners[iC2]] || fOverlapFlagClustersLay[1][iC2])) {
1092 float* clPar2 = GetClusterLayer2(iC2);
1093 fSClusters[fNSingleCluster] = new Float_t[kClNPar];
1094 fSClusters[fNSingleCluster][kSCTh] = clPar2[kClTh];
1095 fSClusters[fNSingleCluster][kSCPh] = clPar2[kClPh];
1096 fSClusters[fNSingleCluster][kSCLab] = clPar2[kClMC0];
1097 fSClusters[fNSingleCluster][kSCID] = iC2;
1098 AliDebug(1,Form(" Adding a single cluster %d (cluster %d of layer 2)",
1099 fNSingleCluster, iC2));
1100 fNSingleCluster++;
1101 fNSingleClusterSPD2++;
1102 }
1103 }
1104 }
1105 //
f9f90134 1106}
1107
1f9831ab 1108//____________________________________________________________________
1109void AliITSMultReconstructor::ProcessESDTracks()
1110{
1111 // Flag the clusters used by ESD tracks
1112 // Flag primary tracks to be used for multiplicity counting
1113 //
e73fcfbb 1114 if (!fESDEvent || !fBuildRefs) return;
1f9831ab 1115 AliESDVertex* vtx = (AliESDVertex*)fESDEvent->GetPrimaryVertexTracks();
7fdf95b0 1116 if (!vtx || vtx->GetNContributors()<1) vtx = (AliESDVertex*)fESDEvent->GetPrimaryVertexSPD();
1117 if (!vtx || vtx->GetNContributors()<1) {
1f9831ab 1118 AliDebug(1,"No primary vertex: cannot flag primary tracks");
1119 return;
1120 }
1121 Int_t ntracks = fESDEvent->GetNumberOfTracks();
1122 for(Int_t itr=0; itr<ntracks; itr++) {
1123 AliESDtrack* track = fESDEvent->GetTrack(itr);
1124 if (!track->IsOn(AliESDtrack::kITSin)) continue; // use only tracks propagated in ITS to vtx
34581d1e 1125 FlagTrackClusters(itr);
6de485aa 1126 FlagIfSecondary(track,vtx);
1f9831ab 1127 }
6de485aa 1128 FlagV0s(vtx);
1f9831ab 1129 //
1130}
1131
1132//____________________________________________________________________
34581d1e 1133void AliITSMultReconstructor::FlagTrackClusters(Int_t id)
1f9831ab 1134{
1135 // RS: flag the SPD clusters of the track if it is useful for the multiplicity estimation
1136 //
34581d1e 1137 const AliESDtrack* track = fESDEvent->GetTrack(id);
1f9831ab 1138 Int_t idx[12];
1139 if ( track->GetITSclusters(idx)<3 ) return; // at least 3 clusters must be used in the fit
f9f90134 1140 Int_t itsType = track->IsOn(AliESDtrack::kITSpureSA) ? 1:0;
1141
1142 for (int i=6/*AliESDfriendTrack::kMaxITScluster*/;i--;) { // ignore extras: note: i>=6 is for extra clusters
1f9831ab 1143 if (idx[i]<0) continue;
1144 int layID= (idx[i] & 0xf0000000) >> 28;
1145 if (layID>1) continue; // SPD only
1146 int clID = (idx[i] & 0x0fffffff);
f9f90134 1147 fUsedClusLay[layID][itsType]->AddReference(clID,id);
1148 fStoreRefs[layID][itsType] = kTRUE;
1f9831ab 1149 }
1150 //
1151}
1152
1153//____________________________________________________________________
6de485aa 1154void AliITSMultReconstructor::FlagIfSecondary(AliESDtrack* track, const AliVertex* vtx)
1f9831ab 1155{
1156 // RS: check if the track is primary and set the flag
6de485aa 1157 double cut = (track->HasPointOnITSLayer(0)||track->HasPointOnITSLayer(1)) ? fCutPxDrSPDin:fCutPxDrSPDout;
1158 float xz[2];
1159 track->GetDZ(vtx->GetX(),vtx->GetY(),vtx->GetZ(), fESDEvent->GetMagneticField(), xz);
1160 if (TMath::Abs(xz[0]*track->P())>cut || TMath::Abs(xz[1]*track->P())>fCutPxDz ||
1161 TMath::Abs(xz[0])>fCutDCArz || TMath::Abs(xz[1])>fCutDCArz)
1162 track->SetStatus(AliESDtrack::kMultSec);
1163 else track->ResetStatus(AliESDtrack::kMultSec);
1164}
1165
1166//____________________________________________________________________
1167void AliITSMultReconstructor::FlagV0s(const AliESDVertex *vtx)
1168{
1169 // flag tracks belonging to v0s
1170 //
1171 const double kK0Mass = 0.4976;
1172 //
1173 AliV0 pvertex;
1174 AliKFVertex vertexKF;
1175 AliKFParticle epKF0,epKF1,pipmKF0,piKF0,piKF1,gammaKF,k0KF;
1176 Double_t mass,massErr,chi2c;
1177 enum {kKFIni=BIT(14)};
1178 //
1179 double recVtx[3];
1180 float recVtxF[3];
1181 vtx->GetXYZ(recVtx);
1182 for (int i=3;i--;) recVtxF[i] = recVtx[i];
1183 //
1184 int ntracks = fESDEvent->GetNumberOfTracks();
1185 if (ntracks<2) return;
1186 //
1187 vertexKF.X() = recVtx[0];
1188 vertexKF.Y() = recVtx[1];
1189 vertexKF.Z() = recVtx[2];
1190 vertexKF.Covariance(0,0) = vtx->GetXRes()*vtx->GetXRes();
1191 vertexKF.Covariance(1,2) = vtx->GetYRes()*vtx->GetYRes();
1192 vertexKF.Covariance(2,2) = vtx->GetZRes()*vtx->GetZRes();
1193 //
1194 AliESDtrack *trc0,*trc1;
1195 for (int it0=0;it0<ntracks;it0++) {
1196 trc0 = fESDEvent->GetTrack(it0);
1197 if (trc0->IsOn(AliESDtrack::kMultInV0)) continue;
1198 if (!trc0->IsOn(AliESDtrack::kITSin)) continue;
1199 Bool_t isSAP = trc0->IsPureITSStandalone();
1200 Int_t q0 = trc0->Charge();
1201 Bool_t testGamma = CanBeElectron(trc0);
1202 epKF0.ResetBit(kKFIni);
1203 piKF0.ResetBit(kKFIni);
1204 double bestChi2=1e16;
1205 int bestID = -1;
1206 //
1207 for (int it1=it0+1;it1<ntracks;it1++) {
1208 trc1 = fESDEvent->GetTrack(it1);
1209 if (trc1->IsOn(AliESDtrack::kMultInV0)) continue;
1210 if (!trc1->IsOn(AliESDtrack::kITSin)) continue;
1211 if (trc1->IsPureITSStandalone() != isSAP) continue; // pair separately ITS_SA_Pure tracks and TPC/ITS+ITS_SA
1212 if ( (q0+trc1->Charge())!=0 ) continue; // don't pair like signs
1213 //
1214 pvertex.SetParamN(q0<0 ? *trc0:*trc1);
1215 pvertex.SetParamP(q0>0 ? *trc0:*trc1);
1216 pvertex.Update(recVtxF);
1217 if (pvertex.P()<fCutMinP) continue;
1218 if (pvertex.GetV0CosineOfPointingAngle()<fCutMinPointAngle) continue;
1219 if (pvertex.GetDcaV0Daughters()>fCutMaxDCADauther) continue;
1220 double d = pvertex.GetD(recVtx[0],recVtx[1],recVtx[2]);
1221 if (d>fCutMaxDCA) continue;
1222 double dx=recVtx[0]-pvertex.Xv(), dy=recVtx[1]-pvertex.Yv();
1223 double rv = TMath::Sqrt(dx*dx+dy*dy);
1224 //
1225 // check gamma conversion hypothesis ----------------------------------------------------------->>>
1226 Bool_t gammaOK = kFALSE;
1227 while (testGamma && CanBeElectron(trc1)) {
1228 if (rv<fCutMinRGamma) break;
1229 if (!epKF0.TestBit(kKFIni)) {
1230 new(&epKF0) AliKFParticle(*trc0,q0>0 ? kPositron:kElectron);
1231 epKF0.SetBit(kKFIni);
1232 }
1233 new(&epKF1) AliKFParticle(*trc1,q0<0 ? kPositron:kElectron);
1234 gammaKF.Initialize();
1235 gammaKF += epKF0;
1236 gammaKF += epKF1;
1237 gammaKF.SetProductionVertex(vertexKF);
1238 gammaKF.GetMass(mass,massErr);
1239 if (mass>fCutMassGamma || (massErr>0&&(mass>massErr*fCutMassGammaNSigma))) break;
1240 if (gammaKF.GetS()<fCutGammaSFromDecay) break;
1241 gammaKF.SetMassConstraint(0.,0.001);
1242 chi2c = (gammaKF.GetNDF()!=0) ? gammaKF.GetChi2()/gammaKF.GetNDF() : 1000;
1243 if (chi2c>fCutChi2cGamma) break;
1244 gammaOK = kTRUE;
1245 if (chi2c>bestChi2) break;
1246 bestChi2 = chi2c;
1247 bestID = it1;
1248 break;
1249 }
1250 if (gammaOK) continue;
1251 // check gamma conversion hypothesis -----------------------------------------------------------<<<
1252 // check K0 conversion hypothesis ----------------------------------------------------------->>>
1253 while (1) {
1254 if (rv<fCutMinRK0) break;
1255 if (!piKF0.TestBit(kKFIni)) {
1256 new(&piKF0) AliKFParticle(*trc0,q0>0 ? kPiPlus:kPiMinus);
1257 piKF0.SetBit(kKFIni);
1258 }
1259 new(&piKF1) AliKFParticle(*trc1,q0<0 ? kPiPlus:kPiMinus);
1260 k0KF.Initialize();
1261 k0KF += piKF0;
1262 k0KF += piKF1;
1263 k0KF.SetProductionVertex(vertexKF);
1264 k0KF.GetMass(mass,massErr);
1265 mass -= kK0Mass;
1266 if (TMath::Abs(mass)>fCutMassK0 || (massErr>0&&(abs(mass)>massErr*fCutMassK0NSigma))) break;
1267 if (k0KF.GetS()<fCutK0SFromDecay) break;
1268 k0KF.SetMassConstraint(kK0Mass,0.001);
1269 chi2c = (k0KF.GetNDF()!=0) ? k0KF.GetChi2()/k0KF.GetNDF() : 1000;
1270 if (chi2c>fCutChi2cK0) break;
1271 if (chi2c>bestChi2) break;
1272 bestChi2 = chi2c;
1273 bestID = it1;
1274 break;
1275 }
1276 // check K0 conversion hypothesis -----------------------------------------------------------<<<
1277 }
1278 //
1279 if (bestID>=0) {
1280 trc0->SetStatus(AliESDtrack::kMultInV0);
1281 fESDEvent->GetTrack(bestID)->SetStatus(AliESDtrack::kMultInV0);
1282 }
1283 }
1284 //
1285}
1286
1287//____________________________________________________________________
1288Bool_t AliITSMultReconstructor::CanBeElectron(const AliESDtrack* trc) const
1289{
1290 // check if the track can be electron
1291 Double_t pid[AliPID::kSPECIES];
1292 if (!trc->IsOn(AliESDtrack::kESDpid)) return kTRUE;
1293 trc->GetESDpid(pid);
1294 return (trc->IsOn(AliESDtrack::kTPCpid)) ?
1295 pid[AliPID::kElectron]>fCutMinElectronProbTPC :
1296 pid[AliPID::kElectron]>fCutMinElectronProbESD;
1297 //
1f9831ab 1298}
9cb64105 1299
1300//____________________________________________________________________
1301AliITSRecPoint* AliITSMultReconstructor::GetRecPoint(Int_t lr, Int_t n) const
1302{
1303 // return a cluster of lr corresponding to orderer cluster index n
1304 if (fClArr[lr] && fClusterCopyIndex[lr] && n<fNClustersLay[lr])
1305 return (AliITSRecPoint*) fClArr[lr]->At(fClusterCopyIndex[lr][n]);
1306 else {
1307 AliError("To access the clusters SetCreateClustersCopy should have been called");
1308 return 0;
1309 }
1310}