3 /**************************************************************************
4 * This file is property of and copyright by the ALICE HLT Project *
5 * ALICE Experiment at CERN, All rights reserved. *
7 * Primary Authors: Jacek Otwinowski (Jacek.Otwinowski@gsi.de) *
8 * for The ALICE HLT Project. *
10 * Permission to use, copy, modify and distribute this software and its *
11 * documentation strictly for non-commercial purposes is hereby granted *
12 * without fee, provided that the above copyright notice appears in all *
13 * copies and that both the copyright notice and this permission notice *
14 * appear in the supporting documentation. The authors make no claims *
15 * about the suitability of this software for any purpose. It is *
16 * provided "as is" without express or implied warranty. *
17 **************************************************************************/
19 /** @file AliHLTGlobalTrackMerger.cxx
20 @author Jacek Otwinowski
22 @brief The HLT global merger base class
25 //#include "AliTPCReconstructor.h"
27 #include "AliESDEvent.h"
28 #include "AliESDVertex.h"
29 #include "AliTracker.h"
30 #include "TTreeStream.h"
32 #include <TClonesArray.h>
34 #include "AliHLTGlobalTrackMerger.h"
40 ClassImp(AliHLTGlobalTrackMerger)
42 AliHLTGlobalTrackMerger::AliHLTGlobalTrackMerger()
54 // standard vertex settings at the moment
55 // V(0.,0.,0.), sigmaVx=sigmaVy=5.e-3 [cm], sigmaVz=5.3 [cm]
56 fVertex = new AliESDVertex;
58 // if (AliTPCReconstructor::StreamLevel()>0) {
59 // fDebugStreamer = new TTreeSRedirector("debugGlobalMerger.root");
64 //_____________________________________________________________________________
65 AliHLTGlobalTrackMerger::~AliHLTGlobalTrackMerger()
68 if(fVertex) delete fVertex; fVertex =0;
69 if(fDebugStreamer) delete fDebugStreamer; fDebugStreamer =0;
72 //_____________________________________________________________________________
73 Bool_t AliHLTGlobalTrackMerger::Merge(AliESDEvent* esdEvent)
75 // merge TPC and TRD tracks
76 // 1. propagate TPC track to the radius between TPC and TRD
77 // 2. propagate TRD track to the same radius between TPC and TRD
78 // 3. matches TPC and TRD tracks at the radius
79 // 4. propagate matched TRD track to the merging radius (first measured TPC point - x coordinate)
80 // 5. merge TPC and TRD track parameters at the merging radius
81 // 6. create AliESDtrack from merged tracks
82 // 7. add AliESDtrack to AliESDEvent
84 if(!esdEvent) return kFALSE;
86 const Double_t kMaxStep = 10.0; // [cm] track propagation step
87 const Double_t kMatchRadius = 285.0; // [cm] matching at radius between TPC and TRD
88 Double_t kMergeRadius = 0.0;
90 Bool_t isMatched = kFALSE;
92 AliExternalTrackParam *extTPCTrack = 0;
94 Int_t nTracks = esdEvent->GetNumberOfTracks();
95 HLTWarning("nTracks %d",nTracks);
98 for(Int_t iTrack = 0; iTrack<nTracks; ++iTrack)
100 track = esdEvent->GetTrack(iTrack);
104 if((track->GetStatus()&AliESDtrack::kTPCin)==0) continue;
105 AliESDtrack *tpcTrack = track;
108 // create external tpc track param (needed to propagate to matching radius)
109 if ((extTPCTrack = new AliExternalTrackParam(*tpcTrack)) == 0) continue;
111 kMergeRadius = tpcTrack->GetTPCPoints(0); // [cm] merging at first measured TPC point
113 HLTInfo("-------------------------------------------------------------------------------------");
114 //HLTInfo("-----tpc track before matching: alpha %f, x %f, y, %f, z %f, snp %f, tgl %f, 1pt %f",tpcTrack->GetAlpha(),tpcTrack->GetX(),tpcTrack->GetY(),tpcTrack->GetZ(),tpcTrack->GetSnp(),tpcTrack->GetTgl(),tpcTrack->GetSigned1Pt());
115 HLTInfo("-----ext tpc track before matching: alpha %f, x %f, y, %f, z %f, snp %f, tgl %f, 1pt %f",extTPCTrack->GetAlpha(),extTPCTrack->GetX(),extTPCTrack->GetY(),extTPCTrack->GetZ(),extTPCTrack->GetSnp(),extTPCTrack->GetTgl(),extTPCTrack->GetSigned1Pt());
117 // propagate tracks to the matching radius
118 //isOk = AliTracker::PropagateTrackTo(tpcTrack,kMatchRadius,tpcTrack->GetMass(),kMaxStep,kFALSE);
119 isOk = AliTracker::PropagateTrackTo(extTPCTrack,kMatchRadius,tpcTrack->GetMass(),kMaxStep,kFALSE);
122 HLTInfo("-----ext tpc track at matching radius: alpha %f, x %f, y, %f, z %f, snp %f, tgl %f, 1pt %f",extTPCTrack->GetAlpha(),extTPCTrack->GetX(),extTPCTrack->GetY(),extTPCTrack->GetZ(),extTPCTrack->GetSnp(),extTPCTrack->GetTgl(),extTPCTrack->GetSigned1Pt());
125 for(Int_t jTrack = 0; jTrack<nTracks; ++jTrack)
127 track = esdEvent->GetTrack(jTrack);
131 if((track->GetStatus()&AliESDtrack::kTRDin)==0) continue;
132 AliESDtrack *trdTrack = track;
135 HLTInfo("-----trd track before matching: alpha %f, x %f, y %f, z %f, snp %f, tgl %f, 1pt %f",trdTrack->GetAlpha(),trdTrack->GetX(),trdTrack->GetY(),trdTrack->GetZ(),trdTrack->GetSnp(),trdTrack->GetTgl(),trdTrack->GetSigned1Pt());
137 isOk = AliTracker::PropagateTrackTo(trdTrack,kMatchRadius,trdTrack->GetMass(),kMaxStep,kFALSE);
140 HLTInfo("-----trd track at matching radius: alpha %f, x %f, y %f, z %f, snp %f, tgl %f, 1pt %f",trdTrack->GetAlpha(),trdTrack->GetX(),trdTrack->GetY(),trdTrack->GetZ(),trdTrack->GetSnp(),trdTrack->GetTgl(),trdTrack->GetSigned1Pt());
142 // match TPC and TRD tracks
143 //isMatched = MatchTracks(tpcTrack,trdTrack);
144 isMatched = MatchTracks(extTPCTrack,trdTrack);
145 if(!isMatched) continue;
147 //HLTInfo("-----tpc track after matching: alpha %f, x %f, y %f, z %f, snp %f, tgl %f, 1pt %f",tpcTrack->GetAlpha(),tpcTrack->GetX(),tpcTrack->GetY(),tpcTrack->GetZ(),tpcTrack->GetSnp(),tpcTrack->GetTgl(),tpcTrack->GetSigned1Pt());
148 HLTInfo("-----ext tpc track after matching: alpha %f, x %f, y %f, z %f, snp %f, tgl %f, 1pt %f",extTPCTrack->GetAlpha(),extTPCTrack->GetX(),extTPCTrack->GetY(),extTPCTrack->GetZ(),extTPCTrack->GetSnp(),extTPCTrack->GetTgl(),extTPCTrack->GetSigned1Pt());
149 HLTInfo("-----trd track after matching: alpha %f, x %f, y %f, z %f, snp %f, tgl %f, 1pt %f",trdTrack->GetAlpha(),trdTrack->GetX(),trdTrack->GetY(),trdTrack->GetZ(),trdTrack->GetSnp(),trdTrack->GetTgl(),trdTrack->GetSigned1Pt());
151 // propagate TRD tracks to the merging radius
152 //isOk = AliTracker::PropagateTrackTo(tpcTrack,kMergeRadius,tpcTrack->GetMass(),kMaxStep,kFALSE);
153 //if(!isOk) continue;
154 isOk = AliTracker::PropagateTrackTo(trdTrack,kMergeRadius,trdTrack->GetMass(),kMaxStep,kFALSE);
157 HLTInfo("-----tpc before merging: alpha %f, x %f, y %f, z %f, snp %f, tgl %f, 1pt %f",tpcTrack->GetAlpha(),tpcTrack->GetX(),tpcTrack->GetY(),tpcTrack->GetZ(),tpcTrack->GetSnp(),tpcTrack->GetTgl(),tpcTrack->GetSigned1Pt());
158 HLTInfo("-----trd before merging: alpha %f, x %f, y %f, z %f, snp %f, tgl %f, 1pt %f",trdTrack->GetAlpha(),trdTrack->GetX(),trdTrack->GetY(),trdTrack->GetZ(),trdTrack->GetSnp(),trdTrack->GetTgl(),trdTrack->GetSigned1Pt());
160 // merge TPC and TRD tracks
161 // create AliESDtrack and add it to AliESDevent
162 Bool_t isMerged = MergeTracks(tpcTrack,trdTrack,esdEvent);
164 HLTInfo("No merged tracks");
166 HLTInfo("nTracksTRD %d",nTracksTRD);
168 // delete external TPC track
169 if(extTPCTrack) delete extTPCTrack; extTPCTrack=0;
171 HLTInfo("nTracksTPC %d",nTracksTPC);
176 //_____________________________________________________________________________
177 Bool_t AliHLTGlobalTrackMerger::MergeTracks(AliESDtrack *tpcTrack, AliESDtrack* trdTrack, AliESDEvent *esdEvent)
179 // merge TPC and TRD track parameters
180 // create new AliESDtrack with TPC+TRD merged track parameters
181 // add AliESDtrack to AliESDEvent
183 if(!tpcTrack) return kFALSE;
184 if(!trdTrack) return kFALSE;
186 Double_t trackParam[5], trackCovar[15];
190 // calculate merged track parameters
191 Bool_t isNotOK = SmoothTracks(tpcTrack->GetParameter(), tpcTrack->GetCovariance(), tpcTrack->GetTPCchi2(), 5,
192 trdTrack->GetParameter(), trdTrack->GetCovariance(), trdTrack->GetTRDchi2(), 5,
193 trackParam, trackCovar, trackChi2, trackNDF,5);
199 // create AliESDtrack
200 // merged TPC+TRD information
204 //track.UpdateTrackParams(tpcTrack, AliESDtrack::kTPCrefit);
205 track.SetStatus(AliESDtrack::kGlobalMerge);
206 track.SetLabel(tpcTrack->GetLabel());
207 track.Set(tpcTrack->GetX(),tpcTrack->GetAlpha(),trackParam,trackCovar);
208 track.SetGlobalChi2(trackChi2);
210 //track.SetTPCLabel(tpcTrack->GetLabel());
211 Double32_t tpcPID[AliPID::kSPECIES];
212 tpcTrack->GetTPCpid(tpcPID);
213 track.SetTPCpid(tpcPID);
214 //fTPCncls=t->GetNumberOfClusters(); // no cluster on HLT
215 //fTPCchi2=t->GetChi2();
217 //track.SetTRDLabel(trdTrack->GetLabel());
218 Double32_t trdPID[AliPID::kSPECIES];
219 trdTrack->GetTRDpid(trdPID);
220 track.SetTRDpid(trdPID);
221 //fTRDchi2 = t->GetChi2();
222 //fTRDncls = t->GetNumberOfClusters();
223 //for (Int_t i=0;i<6;i++) index[i]=t->GetTrackletIndex(i);
225 // add track to AliESDEvent
226 esdEvent->AddTrack(&track);
231 //_____________________________________________________________________________
232 void AliHLTGlobalTrackMerger::SetParameter(Double_t maxy, Double_t maxz, Double_t maxsnp, Double_t maxtgl, Double_t signed1Pt)
234 //set parameters for merger
239 fMaxSigned1Pt = signed1Pt;
242 //_____________________________________________________________________________
243 Bool_t AliHLTGlobalTrackMerger::MatchTracks(AliExternalTrackParam *trackTPC, AliESDtrack *trackTRD)
245 // match TPC and TRD tracks
246 // return kTRUE in case of matching
248 if(!trackTPC) return kFALSE;
249 if(!trackTRD) return kFALSE;
251 Double_t x_tpc=trackTPC->GetX();
252 Double_t y_tpc=trackTPC->GetY();
253 Double_t z_tpc=trackTPC->GetZ();
254 Double_t snp_tpc=trackTPC->GetSnp();
255 Double_t tgl_tpc=trackTPC->GetTgl();
256 Double_t signed1Pt_tpc=trackTPC->GetSigned1Pt();
258 Double_t x_trd=trackTRD->GetX();
259 Double_t y_trd=trackTRD->GetY();
260 Double_t z_trd=trackTRD->GetZ();
261 Double_t snp_trd=trackTRD->GetSnp();
262 Double_t tgl_trd=trackTRD->GetTgl();
263 Double_t signed1Pt_trd=trackTRD->GetSigned1Pt();
266 // if (AliTPCReconstructor::StreamLevel()>0) {
267 // //TTreeSRedirector &cstream = *fDebugStreamer;
268 // *fDebugStreamer<<"match"<<
272 // "snp_tpc="<<snp_tpc<<
273 // "tgl_tpc="<<tgl_tpc<<
274 // "signed1Pt_tpc="<<signed1Pt_tpc<<
278 // "snp_trd="<<snp_trd<<
279 // "tgl_trd="<<tgl_trd<<
280 // "signed1Pt_trd="<<signed1Pt_trd<<
284 if (TMath::Abs(x_tpc-x_trd) > 0) {/* get rid of warning*/;}
285 if (TMath::Abs(y_tpc-y_trd) > fMaxY) return kFALSE;
286 if (TMath::Abs(z_tpc-z_trd) > fMaxZ) return kFALSE;
287 if (TMath::Abs(snp_tpc-snp_trd) > fMaxSnp) return kFALSE;
288 if (TMath::Abs(tgl_tpc-tgl_trd) > fMaxTgl) return kFALSE;
289 if (TMath::Abs(signed1Pt_tpc-signed1Pt_trd) > fMaxSigned1Pt) return kFALSE;
294 //_____________________________________________________________________________
295 Bool_t AliHLTGlobalTrackMerger::SmoothTracks( const Double_t T1[], const Double_t C1[], Double_t Chi21, Int_t NDF1,
296 const Double_t T2[], const Double_t C2[], Double_t Chi22, Int_t NDF2,
297 Double_t T [], Double_t C [], Double_t &Chi2, Int_t &NDF,
300 //* Smooth two tracks with parameter vectors of size N
304 //* T1[N], T2[N] - tracks
305 //* C1[N*(N+1)/2], C2[N*(N+1)/2] - covariance matrices in low-diagonal form:
310 //* Chi2{1,2}, NDF{1,2} - \Chi^2 and "Number of Degrees of Freedom" values for both tracks
313 //* T[N], C[N] ( can be aqual to {T1,C1}, or {T2,C2} )
316 //* returns error flag (0 means OK, 1 not OK )
323 for(Int_t k=0; k<M; k++) A[k] = C1[k] + C2[k];
324 Bool_t err = InvertS(A,N);
327 Chi2 = Chi21 + Chi22;
330 MultSSQ( C1, A, K, N);
332 for( Int_t k=0; k<N;k++) r[k] = T1[k] - T2[k];
333 for( Int_t k=0; k<N;k++ )
334 for( Int_t l=0;l<N;l++) T[k] = T1[k] - K[k*N+l]*r[l];
336 for( Int_t ind=0,i=0; i<N; i++ ){
337 for( Int_t j=0; j<i; j++ ) Chi2+= 2*r[i]*r[j]*A[ind++];
338 Chi2+= r[i]*r[i]*A[ind++];
342 for( Int_t l=0; l<N; l++ ) K[ (N+1)*l ] -= 1;
344 for( Int_t ind = 0, l=0; l<N; ++l ){
345 for( Int_t j=0; j<=l; ++j, ind++ ){
347 for( Int_t k=0; k<N; ++k ) A[ind] -= K[l*N+k] * C1[IndexS(j,k)];
350 for( Int_t l=0; l<N; l++ ) C[l] = A[l];
354 //_____________________________________________________________________________
355 void AliHLTGlobalTrackMerger::MultSSQ( const Double_t *A, const Double_t *B, Double_t *C, Int_t N )
357 for( Int_t ind=0, i=0; i<N; ++i ){
358 for( Int_t j=0; j<N; ++j, ++ind ){
360 for( Int_t k=0; k<N; ++k ) C[ind] += A[IndexS(i,k)] * B[IndexS(k,j)];
365 //_____________________________________________________________________________
366 Bool_t AliHLTGlobalTrackMerger::InvertS( Double_t A[], Int_t N )
368 //* input: simmetric > 0 NxN matrix A = {a11,a21,a22,a31..a33,..}
369 //* output: inverse A, in case of problems fill zero and return 1
371 //* A->low triangular Anew : A = Anew x Anew^T
373 //* for(j=1,N) for(i=j,N) Aij=(Aii-sum_{k=1}^{j-1}Aik*Ajk )/Ajj
378 const Double_t ZERO = 1.E-20;
381 Double_t *j1 = A, *jj = A;
382 for( Int_t j=1; j<=N; j1+=j++, jj+=j ){
383 Double_t *ik = j1, x = 0;
394 for( Int_t step=1; step<=N-j; ik+=++step ){ // ik==Ai1
396 for( Double_t *jk=j1; jk!=jj; sum += (*(jk++)) * (*(ik++)) ) {}
397 *ik = (*ik - sum) * x; // ik == Aij
401 for( Int_t i=j; i<N; i++ ) *(ji+=i) = 0.;
411 //* for(j=1,i-1) Aij=-(sum_{k=j}^{i-1} Aik * Akj) / Aii ;
415 Double_t *ii=A,*ij=A;
416 for( Int_t i = 1; i<=N; ij=ii+1, ii+=++i ){
418 Double_t x = -(*ii = 1./ *ii);
421 for( Int_t j=1; j<i; jj+=++j, ij++ ){
422 Double_t *ik = ij, *kj = jj, sum = 0.;
423 for( Int_t k=j; ik!=ii; kj+=k++, ik++ ){
430 for( Double_t *ik = ij; ik!=ii+1; ik++ ){
440 //* Aij = sum_{k=i}^N Aki * Akj
443 Double_t *ii=A, *ij=A;
444 for( Int_t i=1; i<=N; ii+=++i ){
446 Double_t *ki = ii, *kj = ij, sum = 0.;
447 for( Int_t k=i; k<=N; ki+=k, kj+=k++ ) sum += (*ki) * (*kj);
449 }while( (ij++)!=ii );
455 //_____________________________________________________________________________
456 void AliHLTGlobalTrackMerger::PropagateTracksToDCA(AliESDEvent *esdEvent)
458 // try to propagate all tracks to DCA to primary vertex
459 if(!esdEvent) return;
461 const Double_t kBz = esdEvent->GetMagneticField();
462 const Double_t kSmallRadius = 2.8; // [cm] something less than the beam pipe radius
463 const Double_t kMaxStep = 10.0; // [cm] track propagation step
464 Bool_t isOK = kFALSE;
466 Int_t nTracks = esdEvent->GetNumberOfTracks();
467 for(Int_t iTrack = 0; iTrack<nTracks; ++iTrack) {
468 AliESDtrack *track = esdEvent->GetTrack(iTrack);
471 // propagate to small radius (material budget included)
472 isOK = AliTracker::PropagateTrackTo(track,kSmallRadius,track->GetMass(),kMaxStep,kFALSE);
474 // relate tracks to DCA to primary vertex
477 track->RelateToVertex(fVertex, kBz, kVeryBig);
478 HLTInfo("1-------: alpha %f, x %f, y %f, z %f, snp %f, tgl %f, 1pt %f",track->GetAlpha(),track->GetX(),track->GetY(),track->GetZ(),track->GetSnp(),track->GetTgl(),track->GetSigned1Pt());
482 // the same procedure must be repeated for TPCinner (TPC only) tracks
484 AliExternalTrackParam *tpcTrack = (AliExternalTrackParam *)track->GetTPCInnerParam();
485 if(!tpcTrack) continue;
487 // propagate tpcTracks to small radius (material budget included)
488 isOK = AliTracker::PropagateTrackTo(tpcTrack,kSmallRadius,track->GetMass(),kMaxStep,kFALSE);
490 // relate tracks to DCA to primary vertex
493 Double_t par[2], cov[3];
494 tpcTrack->PropagateToDCA(fVertex, kBz, kVeryBig,par,cov);
495 HLTInfo("2-------: alpha %f, x %f, y %f, z %f, snp %f, tgl %f, 1pt %f",tpcTrack->GetAlpha(),tpcTrack->GetX(),tpcTrack->GetY(),tpcTrack->GetZ(),tpcTrack->GetSnp(),tpcTrack->GetTgl(),tpcTrack->GetSigned1Pt());