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Overlaps corrected, new shape of sectors
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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}
af363e0c 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}
af363e0c 350*/
3ef75756 351
352//______________________________________________________________________
353AliITSMultReconstructor::~AliITSMultReconstructor(){
354 // Destructor
1ba5b31c 355
356 // delete histograms
357 delete fhClustersDPhiAcc;
358 delete fhClustersDThetaAcc;
1ba5b31c 359 delete fhClustersDPhiAll;
360 delete fhClustersDThetaAll;
1ba5b31c 361 delete fhDPhiVsDThetaAll;
362 delete fhDPhiVsDThetaAcc;
1ba5b31c 363 delete fhetaTracklets;
364 delete fhphiTracklets;
365 delete fhetaClustersLay1;
366 delete fhphiClustersLay1;
f9f90134 367 //
1f9831ab 368 // delete arrays
f9f90134 369 for(Int_t i=0; i<fNTracklets; i++) delete [] fTracklets[i];
fa9ed8e9 370
f9f90134 371 for(Int_t i=0; i<fNSingleCluster; i++) delete [] fSClusters[i];
372
373 //
374 for (int i=0;i<2;i++) {
375 delete[] fClustersLay[i];
376 delete[] fDetectorIndexClustersLay[i];
8fb89cdf 377 delete[] fClusterCopyIndex[i];
f9f90134 378 delete[] fOverlapFlagClustersLay[i];
379 delete fClArr[i];
f1b15b8d 380 for (int j=0;j<2;j++) delete fUsedClusLay[i][j];
f9f90134 381 }
1ba5b31c 382 delete [] fTracklets;
968e8539 383 delete [] fSClusters;
f9f90134 384 //
385 delete[] fPartners; fPartners = 0;
386 delete[] fMinDists; fMinDists = 0;
387 delete fBlackList; fBlackList = 0;
388 //
ddced3c8 389}
ac903f1b 390
391//____________________________________________________________________
1f9831ab 392void AliITSMultReconstructor::Reconstruct(AliESDEvent* esd, TTree* treeRP)
d7c5c1e4 393{
6873ed43 394 if (!treeRP) { AliError(" Invalid ITS cluster tree !\n"); return; }
395 if (!esd) {AliError("ESDEvent is not available, use old reconstructor"); return;}
ac903f1b 396 // reset counters
1f9831ab 397 if (fMult) delete fMult; fMult = 0;
f9f90134 398 fNClustersLay[0] = 0;
399 fNClustersLay[1] = 0;
1f9831ab 400 fNTracklets = 0;
401 fNSingleCluster = 0;
b9be2602 402 fNSingleClusterSPD2 = 0;
1f9831ab 403 //
1f9831ab 404 fESDEvent = esd;
405 fTreeRP = treeRP;
406 //
407 // >>>> RS: this part is equivalent to former AliITSVertexer::FindMultiplicity
408 //
409 // see if there is a SPD vertex
410 Bool_t isVtxOK=kTRUE, isCosmics=kFALSE;
411 AliESDVertex* vtx = (AliESDVertex*)fESDEvent->GetPrimaryVertexSPD();
7fdf95b0 412 if (!vtx || vtx->GetNContributors()<1) isVtxOK = kFALSE;
1f9831ab 413 if (vtx && strstr(vtx->GetTitle(),"cosmics")) {
414 isVtxOK = kFALSE;
415 isCosmics = kTRUE;
416 }
417 //
418 if (!isVtxOK) {
419 if (!isCosmics) {
420 AliDebug(1,"Tracklets multiplicity not determined because the primary vertex was not found");
421 AliDebug(1,"Just counting the number of cluster-fired chips on the SPD layers");
422 }
423 vtx = 0;
424 }
f39a4c9c 425 if(vtx){
2942f542 426 float vtxf[3] = {static_cast<float>(vtx->GetX()),static_cast<float>(vtx->GetY()),static_cast<float>(vtx->GetZ())};
f39a4c9c 427 FindTracklets(vtxf);
428 }
429 else {
430 FindTracklets(0);
431 }
1f9831ab 432 //
433 CreateMultiplicityObject();
434}
435
436//____________________________________________________________________
437void AliITSMultReconstructor::Reconstruct(TTree* clusterTree, Float_t* vtx, Float_t* /* vtxRes*/) {
438 //
f9f90134 439 // RS NOTE - this is old reconstructor invocation, to be used from VertexFinder and in analysis mode
d7c5c1e4 440
1f9831ab 441 if (fMult) delete fMult; fMult = 0;
f9f90134 442 fNClustersLay[0] = 0;
443 fNClustersLay[1] = 0;
ac903f1b 444 fNTracklets = 0;
7284b2b2 445 fNSingleCluster = 0;
b9be2602 446 fNSingleClusterSPD2 = 0;
1f9831ab 447 //
448 if (!clusterTree) { AliError(" Invalid ITS cluster tree !\n"); return; }
449 //
450 fESDEvent = 0;
f9f90134 451 SetTreeRP(clusterTree);
1f9831ab 452 //
453 FindTracklets(vtx);
454 //
455}
7284b2b2 456
f9f90134 457
1f9831ab 458//____________________________________________________________________
b80c197e 459void AliITSMultReconstructor::ReconstructMix(TTree* clusterTree, TTree* clusterTreeMix, const Float_t* vtx, Float_t*)
1f9831ab 460{
f9f90134 461 //
462 // RS NOTE - this is old reconstructor invocation, to be used from VertexFinder and in analysis mode
d7c5c1e4 463
f9f90134 464 if (fMult) delete fMult; fMult = 0;
465 fNClustersLay[0] = 0;
466 fNClustersLay[1] = 0;
467 fNTracklets = 0;
468 fNSingleCluster = 0;
b9be2602 469 fNSingleClusterSPD2 = 0;
f9f90134 470 //
471 if (!clusterTree) { AliError(" Invalid ITS cluster tree !\n"); return; }
472 if (!clusterTreeMix) { AliError(" Invalid ITS cluster tree 2nd event !\n"); return; }
473 //
474 fESDEvent = 0;
475 SetTreeRP(clusterTree);
476 SetTreeRPMix(clusterTreeMix);
477 //
478 FindTracklets(vtx);
479 //
480}
481
482
483//____________________________________________________________________
484void AliITSMultReconstructor::FindTracklets(const Float_t *vtx)
485{
d7c5c1e4 486 // - calls LoadClusterArrays that finds the position of the clusters
487 // (in global coord)
f9f90134 488
d7c5c1e4 489 // - convert the cluster coordinates to theta, phi (seen from the
7c6da836 490 // interaction vertex). Clusters in the inner layer can be now
491 // rotated for combinatorial studies
d7c5c1e4 492 // - makes an array of tracklets
493 //
494 // After this method has been called, the clusters of the two layers
495 // and the tracklets can be retrieved by calling the Get'er methods.
496
497
1f9831ab 498 // Find tracklets converging to vertex
499 //
f9f90134 500 LoadClusterArrays(fTreeRP,fTreeRPMix);
1f9831ab 501 // flag clusters used by ESD tracks
6873ed43 502 if (fESDEvent) ProcessESDTracks();
f9f90134 503 fRecoDone = kTRUE;
1f9831ab 504
505 if (!vtx) return;
3ef75756 506
f9f90134 507 InitAux();
fa9ed8e9 508
ac903f1b 509 // find the tracklets
510 AliDebug(1,"Looking for tracklets... ");
fa9ed8e9 511
f9f90134 512 ClusterPos2Angles(vtx); // convert cluster position to angles wrt vtx
513 //
514 // Step1: find all tracklets allowing double assocation:
515 int found = 1;
7284b2b2 516 while (found > 0) {
7284b2b2 517 found = 0;
f9f90134 518 for (Int_t iC1=0; iC1<fNClustersLay[0]; iC1++) found += AssociateClusterOfL1(iC1);
7284b2b2 519 }
f9f90134 520 //
521 // Step2: store tracklets; remove used clusters
522 for (Int_t iC2=0; iC2<fNClustersLay[1]; iC2++) StoreTrackletForL2Cluster(iC2);
523 //
b9be2602 524 // store unused single clusters of L1 (optionally for L2 too)
f9f90134 525 StoreL1Singles();
526 //
ac903f1b 527 AliDebug(1,Form("%d tracklets found", fNTracklets));
528}
529
530//____________________________________________________________________
1f9831ab 531void AliITSMultReconstructor::CreateMultiplicityObject()
532{
533 // create AliMultiplicity object and store it in the ESD event
534 //
535 TBits fastOrFiredMap,firedChipMap;
536 if (fDetTypeRec) {
537 fastOrFiredMap = fDetTypeRec->GetFastOrFiredMap();
538 firedChipMap = fDetTypeRec->GetFiredChipMap(fTreeRP);
539 }
540 //
541 fMult = new AliMultiplicity(fNTracklets,fNSingleCluster,fNFiredChips[0],fNFiredChips[1],fastOrFiredMap);
e73fcfbb 542 fMult->SetMultTrackRefs( fBuildRefs );
b9be2602 543 fMult->SetSPD2SinglesStored(fStoreSPD2SingleCl);
544 fMult->SetNumberOfSingleClustersSPD2(fNSingleClusterSPD2);
f9f90134 545 // store some details of reco:
546 fMult->SetScaleDThetaBySin2T(fScaleDTBySin2T);
547 fMult->SetDPhiWindow2(fDPhiWindow2);
548 fMult->SetDThetaWindow2(fDThetaWindow2);
549 fMult->SetDPhiShift(fDPhiShift);
550 fMult->SetNStdDev(fNStdDev);
551 //
1f9831ab 552 fMult->SetFiredChipMap(firedChipMap);
553 AliITSRecPointContainer* rcont = AliITSRecPointContainer::Instance();
554 fMult->SetITSClusters(0,rcont->GetNClustersInLayer(1,fTreeRP));
555 for(Int_t kk=2;kk<=6;kk++) fMult->SetITSClusters(kk-1,rcont->GetNClustersInLayerFast(kk));
556 //
f9f90134 557 UInt_t shared[100];
558 AliRefArray *refs[2][2] = {{0,0},{0,0}};
e73fcfbb 559 if (fBuildRefs) {
560 for (int il=2;il--;)
561 for (int it=2;it--;) // tracklet_clusters->track references to stor
562 if (fStoreRefs[il][it]) refs[il][it] = new AliRefArray(fNTracklets,0);
563 }
f9f90134 564 //
1f9831ab 565 for (int i=fNTracklets;i--;) {
566 float* tlInfo = fTracklets[i];
f9f90134 567 fMult->SetTrackletData(i,tlInfo);
e73fcfbb 568 //
569 if (!fBuildRefs) continue; // do we need references?
f9f90134 570 for (int itp=0;itp<2;itp++) {
571 for (int ilr=0;ilr<2;ilr++) {
572 if (!fStoreRefs[ilr][itp]) continue; // nothing to store
573 int clID = int(tlInfo[ilr ? kClID2:kClID1]);
574 int nref = fUsedClusLay[ilr][itp]->GetReferences(clID,shared,100);
575 if (!nref) continue;
576 else if (nref==1) refs[ilr][itp]->AddReference(i,shared[0]);
577 else refs[ilr][itp]->AddReferences(i,shared,nref);
578 }
579 }
1f9831ab 580 }
e73fcfbb 581 if (fBuildRefs) fMult->AttachTracklet2TrackRefs(refs[0][0],refs[0][1],refs[1][0],refs[1][1]);
f9f90134 582 //
583 AliRefArray *refsc[2] = {0,0};
e73fcfbb 584 if (fBuildRefs) for (int it=2;it--;) if (fStoreRefs[0][it]) refsc[it] = new AliRefArray(fNClustersLay[0]);
1f9831ab 585 for (int i=fNSingleCluster;i--;) {
586 float* clInfo = fSClusters[i];
f9f90134 587 fMult->SetSingleClusterData(i,clInfo);
e73fcfbb 588 //
589 if (!fBuildRefs) continue; // do we need references?
b9be2602 590 int ilr = i>=(fNSingleCluster-fNSingleClusterSPD2) ? 1:0;
f9f90134 591 int clID = int(clInfo[kSCID]);
592 for (int itp=0;itp<2;itp++) {
b9be2602 593 if (!fStoreRefs[ilr][itp]) continue;
594 int nref = fUsedClusLay[ilr][itp]->GetReferences(clID,shared,100);
f9f90134 595 if (!nref) continue;
596 else if (nref==1) refsc[itp]->AddReference(i,shared[0]);
597 else refsc[itp]->AddReferences(i,shared,nref);
598 }
1f9831ab 599 }
b9be2602 600 //
e73fcfbb 601 if (fBuildRefs) fMult->AttachCluster2TrackRefs(refsc[0],refsc[1]);
1f9831ab 602 fMult->CompactBits();
603 //
604}
605
606
607//____________________________________________________________________
f9f90134 608void AliITSMultReconstructor::LoadClusterArrays(TTree* tree, TTree* treeMix)
609{
610 // load cluster info and prepare tracklets arrays
611 //
612 if (AreClustersLoaded()) {AliInfo("Clusters are already loaded"); return;}
613 LoadClusterArrays(tree,0);
614 LoadClusterArrays(treeMix ? treeMix:tree,1);
615 int nmaxT = TMath::Min(fNClustersLay[0], fNClustersLay[1]);
616 if (fTracklets) delete[] fTracklets;
617 fTracklets = new Float_t*[nmaxT];
618 memset(fTracklets,0,nmaxT*sizeof(Float_t*));
619 //
620 if (fSClusters) delete[] fSClusters;
b9be2602 621 int nSlots = GetStoreSPD2SingleCl() ? fNClustersLay[0]+fNClustersLay[1] : fNClustersLay[0];
622 fSClusters = new Float_t*[nSlots];
623 memset(fSClusters,0,nSlots*sizeof(Float_t*));
f9f90134 624 //
625 AliDebug(1,Form("(clusters in layer 1 : %d, layer 2: %d)",fNClustersLay[0],fNClustersLay[1]));
626 AliDebug(1,Form("(cluster-fired chips in layer 1 : %d, layer 2: %d)",fNFiredChips[0],fNFiredChips[1]));
627 SetClustersLoaded();
628}
629
630//____________________________________________________________________
631void AliITSMultReconstructor::LoadClusterArrays(TTree* itsClusterTree, int il)
1f9831ab 632{
ac903f1b 633 // This method
f9f90134 634 // - gets the clusters from the cluster tree for layer il
ac903f1b 635 // - convert them into global coordinates
636 // - store them in the internal arrays
9b373e9a 637 // - count the number of cluster-fired chips
1f9831ab 638 //
d7c5c1e4 639 // RS: This method was strongly modified wrt original. In order to have the same numbering
1f9831ab 640 // of clusters as in the ITS reco I had to introduce sorting in Z
641 // Also note that now the clusters data are stored not in float[6] attached to float**, but in 1-D array
f9f90134 642 AliDebug(1,Form("Loading clusters and cluster-fired chips for layer %d",il));
643 //
644 fNClustersLay[il] = 0;
645 fNFiredChips[il] = 0;
646 for (int i=2;i--;) fStoreRefs[il][i] = kFALSE;
647 //
648 AliITSRecPointContainer* rpcont = 0;
649 static TClonesArray statITSrec("AliITSRecPoint");
650 static TObjArray clArr(100);
651 TBranch* branch = 0;
652 TClonesArray* itsClusters = 0;
653 //
654 if (!fCreateClustersCopy) {
655 rpcont=AliITSRecPointContainer::Instance();
656 itsClusters = rpcont->FetchClusters(0,itsClusterTree);
657 if(!rpcont->IsSPDActive()){
658 AliWarning("No SPD rec points found, multiplicity not calculated");
659 return;
660 }
661 }
662 else {
663 itsClusters = &statITSrec;
664 branch = itsClusterTree->GetBranch("ITSRecPoints");
665 branch->SetAddress(&itsClusters);
666 if (!fClArr[il]) fClArr[il] = new TClonesArray("AliITSRecPoint",100);
9cb64105 667 delete[] fClusterCopyIndex[il];
f9f90134 668 }
1f9831ab 669 //
fa9ed8e9 670 // count clusters
b21c1af0 671 // loop over the SPD subdetectors
f9f90134 672 int nclLayer = 0;
5afb5e80 673 int detMin = TMath::Max(0,AliITSgeomTGeo::GetModuleIndex(il+1,1,1));
f9f90134 674 int detMax = AliITSgeomTGeo::GetModuleIndex(il+2,1,1);
675 for (int idt=detMin;idt<detMax;idt++) {
676 if (!fCreateClustersCopy) itsClusters = rpcont->UncheckedGetClusters(idt);
677 else branch->GetEvent(idt);
678 int nClusters = itsClusters->GetEntriesFast();
679 if (!nClusters) continue;
680 Int_t nClustersInChip[5] = {0,0,0,0,0};
681 while(nClusters--) {
682 AliITSRecPoint* cluster = (AliITSRecPoint*)itsClusters->UncheckedAt(nClusters);
683 if (!cluster) continue;
778c8b71 684 if (fCreateClustersCopy) cluster = new ((*fClArr[il])[nclLayer]) AliITSRecPoint(*cluster);
f9f90134 685 clArr.AddAtAndExpand(cluster,nclLayer++);
5afb5e80 686 Int_t chipNo = fSPDSeg.GetChipFromLocal(0,cluster->GetDetLocalZ());
687 if(chipNo>=0)nClustersInChip[ chipNo ]++;
1f9831ab 688 }
f9f90134 689 for(Int_t ifChip=5;ifChip--;) if (nClustersInChip[ifChip]) fNFiredChips[il]++;
1f9831ab 690 }
f9f90134 691 // sort the clusters in Z (to have the same numbering as in ITS reco
692 Float_t *z = new Float_t[nclLayer];
693 Int_t *index = new Int_t[nclLayer];
694 for (int ic=0;ic<nclLayer;ic++) z[ic] = ((AliITSRecPoint*)clArr[ic])->GetZ();
695 TMath::Sort(nclLayer,z,index,kFALSE);
696 Float_t* clustersLay = new Float_t[nclLayer*kClNPar];
697 Int_t* detectorIndexClustersLay = new Int_t[nclLayer];
698 Bool_t* overlapFlagClustersLay = new Bool_t[nclLayer];
9cb64105 699 if (fCreateClustersCopy) fClusterCopyIndex[il] = new Int_t[nclLayer];
1f9831ab 700 //
f9f90134 701 for (int ic=0;ic<nclLayer;ic++) {
702 AliITSRecPoint* cluster = (AliITSRecPoint*)clArr[index[ic]];
703 float* clPar = &clustersLay[ic*kClNPar];
704 //
705 cluster->GetGlobalXYZ( clPar );
706 detectorIndexClustersLay[ic] = cluster->GetDetectorIndex();
707 overlapFlagClustersLay[ic] = kFALSE;
708 for (Int_t i=3;i--;) clPar[kClMC0+i] = cluster->GetLabel(i);
9cb64105 709 if (fCreateClustersCopy) fClusterCopyIndex[il][ic] = index[ic];
f9f90134 710 }
711 clArr.Clear();
712 delete[] z;
713 delete[] index;
714 //
715 if (fOverlapFlagClustersLay[il]) delete[] fOverlapFlagClustersLay[il];
716 fOverlapFlagClustersLay[il] = overlapFlagClustersLay;
717 //
718 if (fDetectorIndexClustersLay[il]) delete[] fDetectorIndexClustersLay[il];
719 fDetectorIndexClustersLay[il] = detectorIndexClustersLay;
720 //
e73fcfbb 721 if (fBuildRefs) {
722 for (int it=0;it<2;it++) {
723 if (fUsedClusLay[il][it]) delete fUsedClusLay[il][it];
724 fUsedClusLay[il][it] = new AliRefArray(nclLayer);
725 }
f9f90134 726 }
727 //
728 if (fClustersLay[il]) delete[] fClustersLay[il];
729 fClustersLay[il] = clustersLay;
730 fNClustersLay[il] = nclLayer;
1f9831ab 731 //
9b373e9a 732}
f9f90134 733
9b373e9a 734//____________________________________________________________________
f9f90134 735void AliITSMultReconstructor::LoadClusterFiredChips(TTree* itsClusterTree) {
d7c5c1e4 736 // This method
9b373e9a 737 // - gets the clusters from the cluster tree
738 // - counts the number of (cluster)fired chips
739
740 AliDebug(1,"Loading cluster-fired chips ...");
741
742 fNFiredChips[0] = 0;
743 fNFiredChips[1] = 0;
744
b21c1af0 745 AliITSRecPointContainer* rpcont=AliITSRecPointContainer::Instance();
5afb5e80 746 TClonesArray* itsClusters=NULL;
747 rpcont->FetchClusters(0,itsClusterTree);
b21c1af0 748 if(!rpcont->IsSPDActive()){
749 AliWarning("No SPD rec points found, multiplicity not calculated");
750 return;
751 }
9b373e9a 752
9b373e9a 753 // loop over the its subdetectors
b21c1af0 754 Int_t nSPDmodules=AliITSgeomTGeo::GetModuleIndex(3,1,1);
755 for (Int_t iIts=0; iIts < nSPDmodules; iIts++) {
756 itsClusters=rpcont->UncheckedGetClusters(iIts);
9b373e9a 757 Int_t nClusters = itsClusters->GetEntriesFast();
758
759 // number of clusters in each chip of the current module
760 Int_t nClustersInChip[5] = {0,0,0,0,0};
761 Int_t layer = 0;
8fd16b94 762 Int_t ladder=0;
763 Int_t det=0;
764 AliITSgeomTGeo::GetModuleId(iIts,layer,ladder,det);
765 --layer; // layer is from 1 to 6 in AliITSgeomTGeo, but from 0 to 5 here
766 if(layer<0 || layer >1)continue;
9b373e9a 767
768 // loop over clusters
769 while(nClusters--) {
770 AliITSRecPoint* cluster = (AliITSRecPoint*)itsClusters->UncheckedAt(nClusters);
8fd16b94 771
9b373e9a 772 // find the chip for the current cluster
773 Float_t locz = cluster->GetDetLocalZ();
f9f90134 774 Int_t iChip = fSPDSeg.GetChipFromLocal(0,locz);
e9b15b0c 775 if (iChip>=0) nClustersInChip[iChip]++;
9b373e9a 776
777 }// end of cluster loop
778
779 // get number of fired chips in the current module
9b373e9a 780 for(Int_t ifChip=0; ifChip<5; ifChip++) {
781 if(nClustersInChip[ifChip] >= 1) fNFiredChips[layer]++;
782 }
783
784 } // end of its "subdetector" loop
785
b21c1af0 786
9b373e9a 787 AliDebug(1,Form("(cluster-fired chips in layer 1 : %d, layer 2: %d)",fNFiredChips[0],fNFiredChips[1]));
ac903f1b 788}
789//____________________________________________________________________
790void
791AliITSMultReconstructor::SaveHists() {
3ef75756 792 // This method save the histograms on the output file
793 // (only if fHistOn is TRUE).
ac903f1b 794
795 if (!fHistOn)
796 return;
797
ddced3c8 798 fhClustersDPhiAll->Write();
799 fhClustersDThetaAll->Write();
ac903f1b 800 fhDPhiVsDThetaAll->Write();
ddced3c8 801
802 fhClustersDPhiAcc->Write();
803 fhClustersDThetaAcc->Write();
ac903f1b 804 fhDPhiVsDThetaAcc->Write();
ddced3c8 805
806 fhetaTracklets->Write();
807 fhphiTracklets->Write();
808 fhetaClustersLay1->Write();
809 fhphiClustersLay1->Write();
ac903f1b 810}
7b116aa1 811
812//____________________________________________________________________
b80c197e 813void AliITSMultReconstructor::FlagClustersInOverlapRegions (Int_t iC1, Int_t iC2WithBestDist)
814{
815 // Flags clusters in the overlapping regions
7b116aa1 816 Float_t distClSameMod=0.;
7b116aa1 817 Float_t meanRadiusLay1 = 3.99335; // average radius inner layer
818 Float_t meanRadiusLay2 = 7.37935; // average radius outer layer;
819
820 Float_t zproj1=0.;
821 Float_t zproj2=0.;
822 Float_t deZproj=0.;
1f9831ab 823 Float_t* clPar1 = GetClusterLayer1(iC1);
824 Float_t* clPar2B = GetClusterLayer2(iC2WithBestDist);
7b116aa1 825 // Loop on inner layer clusters
f9f90134 826 for (Int_t iiC1=0; iiC1<fNClustersLay[0]; iiC1++) {
827 if (!fOverlapFlagClustersLay[0][iiC1]) {
7b116aa1 828 // only for adjacent modules
f9f90134 829 if ((TMath::Abs(fDetectorIndexClustersLay[0][iC1]-fDetectorIndexClustersLay[0][iiC1])==4)||
830 (TMath::Abs(fDetectorIndexClustersLay[0][iC1]-fDetectorIndexClustersLay[0][iiC1])==76)) {
1f9831ab 831 Float_t *clPar11 = GetClusterLayer1(iiC1);
832 Float_t dePhi=TMath::Abs(clPar11[kClPh]-clPar1[kClPh]);
7b116aa1 833 if (dePhi>TMath::Pi()) dePhi=2.*TMath::Pi()-dePhi;
834
1f9831ab 835 zproj1=meanRadiusLay1/TMath::Tan(clPar1[kClTh]);
836 zproj2=meanRadiusLay1/TMath::Tan(clPar11[kClTh]);
7b116aa1 837
838 deZproj=TMath::Abs(zproj1-zproj2);
839
840 distClSameMod = TMath::Sqrt(TMath::Power(deZproj/fZetaOverlapCut,2)+TMath::Power(dePhi/fPhiOverlapCut,2));
f9f90134 841 if (distClSameMod<=1.) fOverlapFlagClustersLay[0][iiC1]=kTRUE;
7b116aa1 842
7b116aa1 843 } // end adjacent modules
844 }
845 } // end Loop on inner layer clusters
846
7b116aa1 847
848 distClSameMod=0.;
7b116aa1 849 // Loop on outer layer clusters
f9f90134 850 for (Int_t iiC2=0; iiC2<fNClustersLay[1]; iiC2++) {
851 if (!fOverlapFlagClustersLay[1][iiC2]) {
7b116aa1 852 // only for adjacent modules
1f9831ab 853 Float_t *clPar2 = GetClusterLayer2(iiC2);
f9f90134 854 if ((TMath::Abs(fDetectorIndexClustersLay[1][iC2WithBestDist]-fDetectorIndexClustersLay[1][iiC2])==4) ||
855 (TMath::Abs(fDetectorIndexClustersLay[1][iC2WithBestDist]-fDetectorIndexClustersLay[1][iiC2])==156)) {
1f9831ab 856 Float_t dePhi=TMath::Abs(clPar2[kClPh]-clPar2B[kClPh]);
7b116aa1 857 if (dePhi>TMath::Pi()) dePhi=2.*TMath::Pi()-dePhi;
858
1f9831ab 859 zproj1=meanRadiusLay2/TMath::Tan(clPar2B[kClTh]);
860 zproj2=meanRadiusLay2/TMath::Tan(clPar2[kClTh]);
7b116aa1 861
862 deZproj=TMath::Abs(zproj1-zproj2);
863 distClSameMod = TMath::Sqrt(TMath::Power(deZproj/fZetaOverlapCut,2)+TMath::Power(dePhi/fPhiOverlapCut,2));
f9f90134 864 if (distClSameMod<=1.) fOverlapFlagClustersLay[1][iiC2]=kTRUE;
7b116aa1 865
7b116aa1 866 } // end adjacent modules
867 }
868 } // end Loop on outer layer clusters
869
6b489238 870}
1f9831ab 871
f9f90134 872//____________________________________________________________________
873void AliITSMultReconstructor::InitAux()
874{
875 // init arrays/parameters for tracklet reconstruction
876
877 // dPhi shift is field dependent, get average magnetic field
878 Float_t bz = 0;
879 AliMagF* field = 0;
880 if (TGeoGlobalMagField::Instance()) field = dynamic_cast<AliMagF*>(TGeoGlobalMagField::Instance()->GetField());
881 if (!field) {
882 AliError("Could not retrieve magnetic field. Assuming no field. Delta Phi shift will be deactivated in AliITSMultReconstructor.");
883 }
884 else bz = TMath::Abs(field->SolenoidField());
885 fDPhiShift = fPhiShift / 5 * bz;
886 AliDebug(1, Form("Using phi shift of %f", fDPhiShift));
887 //
888 if (fPartners) delete[] fPartners; fPartners = new Int_t[fNClustersLay[1]];
889 if (fMinDists) delete[] fMinDists; fMinDists = new Float_t[fNClustersLay[1]];
890 if (fAssociatedLay1) delete[] fAssociatedLay1; fAssociatedLay1 = new Int_t[fNClustersLay[0]];
891 //
892 if (fBlackList) delete fBlackList; fBlackList = new AliRefArray(fNClustersLay[0]);
893 //
894 // Printf("Vertex in find tracklets...%f %f %f",vtx[0],vtx[1],vtx[2]);
895 for (Int_t i=0; i<fNClustersLay[1]; i++) {
896 fPartners[i] = -1;
897 fMinDists[i] = 2*fNStdDev;
898 }
899 memset(fAssociatedLay1,0,fNClustersLay[0]*sizeof(Int_t));
900 //
901}
902
903//____________________________________________________________________
904void AliITSMultReconstructor::ClusterPos2Angles(const Float_t *vtx)
905{
906 // convert cluster coordinates to angles wrt vertex
907 for (int ilr=0;ilr<2;ilr++) {
908 for (Int_t iC=0; iC<fNClustersLay[ilr]; iC++) {
909 float* clPar = GetClusterOfLayer(ilr,iC);
910 CalcThetaPhi(clPar[kClTh]-vtx[0],clPar[kClPh]-vtx[1],clPar[kClZ]-vtx[2],clPar[kClTh],clPar[kClPh]);
911 if (ilr==0) {
912 clPar[kClPh] = clPar[kClPh] + fPhiRotationAngle; // rotation of inner layer for comb studies
913 if (fHistOn) {
914 Float_t eta = clPar[kClTh];
915 eta= TMath::Tan(eta/2.);
916 eta=-TMath::Log(eta);
917 fhetaClustersLay1->Fill(eta);
918 fhphiClustersLay1->Fill(clPar[kClPh]);
919 }
920 }
921 }
922 }
923 //
924}
925
926//____________________________________________________________________
927Int_t AliITSMultReconstructor::AssociateClusterOfL1(Int_t iC1)
928{
929 // search association of cluster iC1 of L1 with all clusters of L2
930 if (fAssociatedLay1[iC1] != 0) return 0;
931 Int_t iC2WithBestDist = -1; // reset
932 Double_t minDist = 2*fNStdDev; // reset
933 float* clPar1 = GetClusterLayer1(iC1);
934 for (Int_t iC2=0; iC2<fNClustersLay[1]; iC2++) {
935 //
936 if (fBlackList->IsReferred(iC1,iC2)) continue;
937 float* clPar2 = GetClusterLayer2(iC2);
938 //
939 // find the difference in angles
940 Double_t dTheta = TMath::Abs(clPar2[kClTh] - clPar1[kClTh]);
941 Double_t dPhi = TMath::Abs(clPar2[kClPh] - clPar1[kClPh]);
942 // Printf("detheta %f dephi %f", dTheta,dPhi);
943 //
944 if (dPhi>TMath::Pi()) dPhi=2.*TMath::Pi()-dPhi; // take into account boundary condition
945 //
946 if (fHistOn) {
947 fhClustersDPhiAll->Fill(dPhi);
948 fhClustersDThetaAll->Fill(dTheta);
949 fhDPhiVsDThetaAll->Fill(dTheta, dPhi);
950 }
032b4329 951 Float_t d = CalcDist(dPhi,clPar2[kClTh] - clPar1[kClTh],clPar1[kClTh]); // make "elliptical" cut in Phi and Theta!
f9f90134 952 // look for the minimum distance: the minimum is in iC2WithBestDist
953 if (d<fNStdDev && d<minDist) { minDist=d; iC2WithBestDist = iC2; }
954 }
955 //
956 if (minDist<fNStdDev) { // This means that a cluster in layer 2 was found that matches with iC1
957 //
958 if (fMinDists[iC2WithBestDist] > minDist) {
959 Int_t oldPartner = fPartners[iC2WithBestDist];
960 fPartners[iC2WithBestDist] = iC1;
961 fMinDists[iC2WithBestDist] = minDist;
962 //
963 fAssociatedLay1[iC1] = 1; // mark as assigned
964 //
965 if (oldPartner != -1) {
966 // redo partner search for cluster in L0 (oldPartner), putting this one (iC2WithBestDist) on its fBlackList
967 fBlackList->AddReference(oldPartner,iC2WithBestDist);
968 fAssociatedLay1[oldPartner] = 0; // mark as free
969 }
970 } else {
971 // try again to find a cluster without considering iC2WithBestDist
972 fBlackList->AddReference(iC1,iC2WithBestDist);
973 }
974 //
975 }
976 else fAssociatedLay1[iC1] = 2;// cluster has no partner; remove
977 //
978 return 1;
979}
980
981//____________________________________________________________________
982Int_t AliITSMultReconstructor::StoreTrackletForL2Cluster(Int_t iC2)
983{
984 // build tracklet for cluster iC2 of layer 2
985 if (fPartners[iC2] == -1) return 0;
986 if (fRemoveClustersFromOverlaps) FlagClustersInOverlapRegions (fPartners[iC2],iC2);
987 // Printf("saving tracklets");
988 if (fOverlapFlagClustersLay[0][fPartners[iC2]] || fOverlapFlagClustersLay[1][iC2]) return 0;
989 float* clPar2 = GetClusterLayer2(iC2);
990 float* clPar1 = GetClusterLayer1(fPartners[iC2]);
991 //
992 Float_t* tracklet = fTracklets[fNTracklets] = new Float_t[kTrNPar]; // RS Add also the cluster id's
993 //
994 tracklet[kTrTheta] = clPar1[kClTh]; // use the theta from the clusters in the first layer
995 tracklet[kTrPhi] = clPar1[kClPh]; // use the phi from the clusters in the first layer
996 tracklet[kTrDPhi] = clPar1[kClPh] - clPar2[kClPh]; // store the difference between phi1 and phi2
997 //
998 // define dphi in the range [0,pi] with proper sign (track charge correlated)
999 if (tracklet[kTrDPhi] > TMath::Pi()) tracklet[kTrDPhi] = tracklet[kTrDPhi]-2.*TMath::Pi();
1000 if (tracklet[kTrDPhi] < -TMath::Pi()) tracklet[kTrDPhi] = tracklet[kTrDPhi]+2.*TMath::Pi();
1001 //
1002 tracklet[kTrDTheta] = clPar1[kClTh] - clPar2[kClTh]; // store the theta1-theta2
1003 //
1004 if (fHistOn) {
1005 fhClustersDPhiAcc->Fill(tracklet[kTrDPhi]);
1006 fhClustersDThetaAcc->Fill(tracklet[kTrDTheta]);
1007 fhDPhiVsDThetaAcc->Fill(tracklet[kTrDTheta],tracklet[kTrDPhi]);
1008 }
1009 //
1010 // find label
1011 // if equal label in both clusters found this label is assigned
1012 // if no equal label can be found the first labels of the L1 AND L2 cluster are assigned
1013 Int_t label1=0,label2=0;
1014 while (label2 < 3) {
1015 if ( int(clPar1[kClMC0+label1])!=-2 && int(clPar1[kClMC0+label1])==int(clPar2[kClMC0+label2])) break;
1016 if (++label1 == 3) { label1 = 0; label2++; }
1017 }
1018 if (label2 < 3) {
1019 AliDebug(AliLog::kDebug, Form("Found label %d == %d for tracklet candidate %d\n",
1020 (Int_t) clPar1[kClMC0+label1], (Int_t) clPar1[kClMC0+label2], fNTracklets));
1021 tracklet[kTrLab1] = tracklet[kTrLab2] = clPar1[kClMC0+label1];
1022 } else {
1023 AliDebug(AliLog::kDebug, Form("Did not find label %d %d %d %d %d %d for tracklet candidate %d\n",
1024 (Int_t) clPar1[kClMC0], (Int_t) clPar1[kClMC1], (Int_t) clPar1[kClMC2],
1025 (Int_t) clPar2[kClMC0], (Int_t) clPar2[kClMC1], (Int_t) clPar2[kClMC2], fNTracklets));
1026 tracklet[kTrLab1] = clPar1[kClMC0];
1027 tracklet[kTrLab2] = clPar2[kClMC0];
1028 }
1029 //
1030 if (fHistOn) {
1031 Float_t eta = tracklet[kTrTheta];
1032 eta= TMath::Tan(eta/2.);
1033 eta=-TMath::Log(eta);
1034 fhetaTracklets->Fill(eta);
1035 fhphiTracklets->Fill(tracklet[kTrPhi]);
1036 }
1037 //
1038 tracklet[kClID1] = fPartners[iC2];
1039 tracklet[kClID2] = iC2;
1040 //
1041 // Printf("Adding tracklet candidate");
1042 AliDebug(1,Form(" Adding tracklet candidate %d ", fNTracklets));
1043 AliDebug(1,Form(" Cl. %d of Layer 1 and %d of Layer 2", fPartners[iC2], iC2));
1044 fNTracklets++;
1045 fAssociatedLay1[fPartners[iC2]] = 1;
1046 //
1047 return 1;
1048}
1049
1050//____________________________________________________________________
1051void AliITSMultReconstructor::StoreL1Singles()
1052{
1053 // Printf("saving single clusters...");
1054 for (Int_t iC1=0; iC1<fNClustersLay[0]; iC1++) {
1055 float* clPar1 = GetClusterLayer1(iC1);
1056 if (fAssociatedLay1[iC1]==2||fAssociatedLay1[iC1]==0) {
1057 fSClusters[fNSingleCluster] = new Float_t[kClNPar];
1058 fSClusters[fNSingleCluster][kSCTh] = clPar1[kClTh];
1059 fSClusters[fNSingleCluster][kSCPh] = clPar1[kClPh];
1060 fSClusters[fNSingleCluster][kSCLab] = clPar1[kClMC0];
1061 fSClusters[fNSingleCluster][kSCID] = iC1;
1062 AliDebug(1,Form(" Adding a single cluster %d (cluster %d of layer 1)",
1063 fNSingleCluster, iC1));
1064 fNSingleCluster++;
1065 }
1066 }
1067 //
b9be2602 1068 if (GetStoreSPD2SingleCl()) {
1069 for (Int_t iC2=0; iC2<fNClustersLay[1]; iC2++) {
1070 if (fPartners[iC2]<0 || (fOverlapFlagClustersLay[0][fPartners[iC2]] || fOverlapFlagClustersLay[1][iC2])) {
1071 float* clPar2 = GetClusterLayer2(iC2);
1072 fSClusters[fNSingleCluster] = new Float_t[kClNPar];
1073 fSClusters[fNSingleCluster][kSCTh] = clPar2[kClTh];
1074 fSClusters[fNSingleCluster][kSCPh] = clPar2[kClPh];
1075 fSClusters[fNSingleCluster][kSCLab] = clPar2[kClMC0];
1076 fSClusters[fNSingleCluster][kSCID] = iC2;
1077 AliDebug(1,Form(" Adding a single cluster %d (cluster %d of layer 2)",
1078 fNSingleCluster, iC2));
1079 fNSingleCluster++;
1080 fNSingleClusterSPD2++;
1081 }
1082 }
1083 }
1084 //
f9f90134 1085}
1086
1f9831ab 1087//____________________________________________________________________
1088void AliITSMultReconstructor::ProcessESDTracks()
1089{
1090 // Flag the clusters used by ESD tracks
1091 // Flag primary tracks to be used for multiplicity counting
1092 //
e73fcfbb 1093 if (!fESDEvent || !fBuildRefs) return;
1f9831ab 1094 AliESDVertex* vtx = (AliESDVertex*)fESDEvent->GetPrimaryVertexTracks();
7fdf95b0 1095 if (!vtx || vtx->GetNContributors()<1) vtx = (AliESDVertex*)fESDEvent->GetPrimaryVertexSPD();
1096 if (!vtx || vtx->GetNContributors()<1) {
1f9831ab 1097 AliDebug(1,"No primary vertex: cannot flag primary tracks");
1098 return;
1099 }
1100 Int_t ntracks = fESDEvent->GetNumberOfTracks();
1101 for(Int_t itr=0; itr<ntracks; itr++) {
1102 AliESDtrack* track = fESDEvent->GetTrack(itr);
1103 if (!track->IsOn(AliESDtrack::kITSin)) continue; // use only tracks propagated in ITS to vtx
34581d1e 1104 FlagTrackClusters(itr);
6de485aa 1105 FlagIfSecondary(track,vtx);
1f9831ab 1106 }
6de485aa 1107 FlagV0s(vtx);
1f9831ab 1108 //
1109}
1110
1111//____________________________________________________________________
34581d1e 1112void AliITSMultReconstructor::FlagTrackClusters(Int_t id)
1f9831ab 1113{
1114 // RS: flag the SPD clusters of the track if it is useful for the multiplicity estimation
1115 //
34581d1e 1116 const AliESDtrack* track = fESDEvent->GetTrack(id);
1f9831ab 1117 Int_t idx[12];
1118 if ( track->GetITSclusters(idx)<3 ) return; // at least 3 clusters must be used in the fit
f9f90134 1119 Int_t itsType = track->IsOn(AliESDtrack::kITSpureSA) ? 1:0;
1120
1121 for (int i=6/*AliESDfriendTrack::kMaxITScluster*/;i--;) { // ignore extras: note: i>=6 is for extra clusters
1f9831ab 1122 if (idx[i]<0) continue;
1123 int layID= (idx[i] & 0xf0000000) >> 28;
1124 if (layID>1) continue; // SPD only
1125 int clID = (idx[i] & 0x0fffffff);
f9f90134 1126 fUsedClusLay[layID][itsType]->AddReference(clID,id);
1127 fStoreRefs[layID][itsType] = kTRUE;
1f9831ab 1128 }
1129 //
1130}
1131
1132//____________________________________________________________________
6de485aa 1133void AliITSMultReconstructor::FlagIfSecondary(AliESDtrack* track, const AliVertex* vtx)
1f9831ab 1134{
1135 // RS: check if the track is primary and set the flag
6de485aa 1136 double cut = (track->HasPointOnITSLayer(0)||track->HasPointOnITSLayer(1)) ? fCutPxDrSPDin:fCutPxDrSPDout;
1137 float xz[2];
1138 track->GetDZ(vtx->GetX(),vtx->GetY(),vtx->GetZ(), fESDEvent->GetMagneticField(), xz);
1139 if (TMath::Abs(xz[0]*track->P())>cut || TMath::Abs(xz[1]*track->P())>fCutPxDz ||
1140 TMath::Abs(xz[0])>fCutDCArz || TMath::Abs(xz[1])>fCutDCArz)
1141 track->SetStatus(AliESDtrack::kMultSec);
1142 else track->ResetStatus(AliESDtrack::kMultSec);
1143}
1144
1145//____________________________________________________________________
1146void AliITSMultReconstructor::FlagV0s(const AliESDVertex *vtx)
1147{
1148 // flag tracks belonging to v0s
1149 //
1150 const double kK0Mass = 0.4976;
1151 //
1152 AliV0 pvertex;
1153 AliKFVertex vertexKF;
1154 AliKFParticle epKF0,epKF1,pipmKF0,piKF0,piKF1,gammaKF,k0KF;
1155 Double_t mass,massErr,chi2c;
1156 enum {kKFIni=BIT(14)};
1157 //
1158 double recVtx[3];
1159 float recVtxF[3];
1160 vtx->GetXYZ(recVtx);
1161 for (int i=3;i--;) recVtxF[i] = recVtx[i];
1162 //
1163 int ntracks = fESDEvent->GetNumberOfTracks();
1164 if (ntracks<2) return;
1165 //
1166 vertexKF.X() = recVtx[0];
1167 vertexKF.Y() = recVtx[1];
1168 vertexKF.Z() = recVtx[2];
1169 vertexKF.Covariance(0,0) = vtx->GetXRes()*vtx->GetXRes();
1170 vertexKF.Covariance(1,2) = vtx->GetYRes()*vtx->GetYRes();
1171 vertexKF.Covariance(2,2) = vtx->GetZRes()*vtx->GetZRes();
1172 //
1173 AliESDtrack *trc0,*trc1;
1174 for (int it0=0;it0<ntracks;it0++) {
1175 trc0 = fESDEvent->GetTrack(it0);
1176 if (trc0->IsOn(AliESDtrack::kMultInV0)) continue;
1177 if (!trc0->IsOn(AliESDtrack::kITSin)) continue;
1178 Bool_t isSAP = trc0->IsPureITSStandalone();
1179 Int_t q0 = trc0->Charge();
1180 Bool_t testGamma = CanBeElectron(trc0);
1181 epKF0.ResetBit(kKFIni);
1182 piKF0.ResetBit(kKFIni);
1183 double bestChi2=1e16;
1184 int bestID = -1;
1185 //
1186 for (int it1=it0+1;it1<ntracks;it1++) {
1187 trc1 = fESDEvent->GetTrack(it1);
1188 if (trc1->IsOn(AliESDtrack::kMultInV0)) continue;
1189 if (!trc1->IsOn(AliESDtrack::kITSin)) continue;
1190 if (trc1->IsPureITSStandalone() != isSAP) continue; // pair separately ITS_SA_Pure tracks and TPC/ITS+ITS_SA
1191 if ( (q0+trc1->Charge())!=0 ) continue; // don't pair like signs
1192 //
1193 pvertex.SetParamN(q0<0 ? *trc0:*trc1);
1194 pvertex.SetParamP(q0>0 ? *trc0:*trc1);
1195 pvertex.Update(recVtxF);
1196 if (pvertex.P()<fCutMinP) continue;
1197 if (pvertex.GetV0CosineOfPointingAngle()<fCutMinPointAngle) continue;
1198 if (pvertex.GetDcaV0Daughters()>fCutMaxDCADauther) continue;
1199 double d = pvertex.GetD(recVtx[0],recVtx[1],recVtx[2]);
1200 if (d>fCutMaxDCA) continue;
1201 double dx=recVtx[0]-pvertex.Xv(), dy=recVtx[1]-pvertex.Yv();
1202 double rv = TMath::Sqrt(dx*dx+dy*dy);
1203 //
1204 // check gamma conversion hypothesis ----------------------------------------------------------->>>
1205 Bool_t gammaOK = kFALSE;
1206 while (testGamma && CanBeElectron(trc1)) {
1207 if (rv<fCutMinRGamma) break;
1208 if (!epKF0.TestBit(kKFIni)) {
1209 new(&epKF0) AliKFParticle(*trc0,q0>0 ? kPositron:kElectron);
1210 epKF0.SetBit(kKFIni);
1211 }
1212 new(&epKF1) AliKFParticle(*trc1,q0<0 ? kPositron:kElectron);
1213 gammaKF.Initialize();
1214 gammaKF += epKF0;
1215 gammaKF += epKF1;
1216 gammaKF.SetProductionVertex(vertexKF);
1217 gammaKF.GetMass(mass,massErr);
1218 if (mass>fCutMassGamma || (massErr>0&&(mass>massErr*fCutMassGammaNSigma))) break;
1219 if (gammaKF.GetS()<fCutGammaSFromDecay) break;
1220 gammaKF.SetMassConstraint(0.,0.001);
1221 chi2c = (gammaKF.GetNDF()!=0) ? gammaKF.GetChi2()/gammaKF.GetNDF() : 1000;
1222 if (chi2c>fCutChi2cGamma) break;
1223 gammaOK = kTRUE;
1224 if (chi2c>bestChi2) break;
1225 bestChi2 = chi2c;
1226 bestID = it1;
1227 break;
1228 }
1229 if (gammaOK) continue;
1230 // check gamma conversion hypothesis -----------------------------------------------------------<<<
1231 // check K0 conversion hypothesis ----------------------------------------------------------->>>
1232 while (1) {
1233 if (rv<fCutMinRK0) break;
1234 if (!piKF0.TestBit(kKFIni)) {
1235 new(&piKF0) AliKFParticle(*trc0,q0>0 ? kPiPlus:kPiMinus);
1236 piKF0.SetBit(kKFIni);
1237 }
1238 new(&piKF1) AliKFParticle(*trc1,q0<0 ? kPiPlus:kPiMinus);
1239 k0KF.Initialize();
1240 k0KF += piKF0;
1241 k0KF += piKF1;
1242 k0KF.SetProductionVertex(vertexKF);
1243 k0KF.GetMass(mass,massErr);
1244 mass -= kK0Mass;
1245 if (TMath::Abs(mass)>fCutMassK0 || (massErr>0&&(abs(mass)>massErr*fCutMassK0NSigma))) break;
1246 if (k0KF.GetS()<fCutK0SFromDecay) break;
1247 k0KF.SetMassConstraint(kK0Mass,0.001);
1248 chi2c = (k0KF.GetNDF()!=0) ? k0KF.GetChi2()/k0KF.GetNDF() : 1000;
1249 if (chi2c>fCutChi2cK0) break;
1250 if (chi2c>bestChi2) break;
1251 bestChi2 = chi2c;
1252 bestID = it1;
1253 break;
1254 }
1255 // check K0 conversion hypothesis -----------------------------------------------------------<<<
1256 }
1257 //
1258 if (bestID>=0) {
1259 trc0->SetStatus(AliESDtrack::kMultInV0);
1260 fESDEvent->GetTrack(bestID)->SetStatus(AliESDtrack::kMultInV0);
1261 }
1262 }
1263 //
1264}
1265
1266//____________________________________________________________________
1267Bool_t AliITSMultReconstructor::CanBeElectron(const AliESDtrack* trc) const
1268{
1269 // check if the track can be electron
1270 Double_t pid[AliPID::kSPECIES];
1271 if (!trc->IsOn(AliESDtrack::kESDpid)) return kTRUE;
1272 trc->GetESDpid(pid);
1273 return (trc->IsOn(AliESDtrack::kTPCpid)) ?
1274 pid[AliPID::kElectron]>fCutMinElectronProbTPC :
1275 pid[AliPID::kElectron]>fCutMinElectronProbESD;
1276 //
1f9831ab 1277}
9cb64105 1278
1279//____________________________________________________________________
1280AliITSRecPoint* AliITSMultReconstructor::GetRecPoint(Int_t lr, Int_t n) const
1281{
1282 // return a cluster of lr corresponding to orderer cluster index n
1283 if (fClArr[lr] && fClusterCopyIndex[lr] && n<fNClustersLay[lr])
1284 return (AliITSRecPoint*) fClArr[lr]->At(fClusterCopyIndex[lr][n]);
1285 else {
1286 AliError("To access the clusters SetCreateClustersCopy should have been called");
1287 return 0;
1288 }
1289}