1 /**************************************************************************
2 * Copyright(c) 1998-1999, ALICE Experiment at CERN, All rights reserved. *
4 * Author: The ALICE Off-line Project. *
5 * Contributors are mentioned in the code where appropriate. *
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 *
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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 **************************************************************************/
18 ////////////////////////////////////////////////////////////////////////////
20 // The TRD offline tracklet
22 // The running horse of the TRD reconstruction. The following tasks are preformed:
23 // 1. Clusters attachment to tracks based on prior information stored at tracklet level (see AttachClusters)
24 // 2. Clusters position recalculation based on track information (see GetClusterXY and Fit)
25 // 3. Cluster error parametrization recalculation (see Fit)
26 // 4. Linear track approximation (Fit)
27 // 5. Optimal position (including z estimate for pad row cross tracklets) and covariance matrix of the track fit inside one TRD chamber (Fit)
28 // 6. Tilt pad correction and systematic effects (GetCovAt)
29 // 7. dEdx calculation (CookdEdx)
30 // 8. PID probabilities estimation (CookPID)
33 // Alex Bercuci <A.Bercuci@gsi.de> //
34 // Markus Fasel <M.Fasel@gsi.de> //
36 ////////////////////////////////////////////////////////////////////////////
39 #include "TLinearFitter.h"
40 #include "TClonesArray.h" // tmp
41 #include <TTreeStream.h>
44 #include "AliMathBase.h"
45 #include "AliCDBManager.h"
46 #include "AliTracker.h"
48 #include "AliTRDpadPlane.h"
49 #include "AliTRDcluster.h"
50 #include "AliTRDseedV1.h"
51 #include "AliTRDtrackV1.h"
52 #include "AliTRDcalibDB.h"
53 #include "AliTRDchamberTimeBin.h"
54 #include "AliTRDtrackingChamber.h"
55 #include "AliTRDtrackerV1.h"
56 #include "AliTRDReconstructor.h"
57 #include "AliTRDrecoParam.h"
58 #include "AliTRDCommonParam.h"
60 #include "Cal/AliTRDCalPID.h"
61 #include "Cal/AliTRDCalROC.h"
62 #include "Cal/AliTRDCalDet.h"
64 ClassImp(AliTRDseedV1)
66 //____________________________________________________________________
67 AliTRDseedV1::AliTRDseedV1(Int_t det)
94 for(Int_t ic=kNclusters; ic--;) fIndexes[ic] = -1;
95 memset(fClusters, 0, kNclusters*sizeof(AliTRDcluster*));
96 memset(fPad, 0, 3*sizeof(Float_t));
97 fYref[0] = 0.; fYref[1] = 0.;
98 fZref[0] = 0.; fZref[1] = 0.;
99 fYfit[0] = 0.; fYfit[1] = 0.;
100 fZfit[0] = 0.; fZfit[1] = 0.;
101 memset(fdEdx, 0, kNslices*sizeof(Float_t));
102 for(int ispec=0; ispec<AliPID::kSPECIES; ispec++) fProb[ispec] = -1.;
103 fLabels[0]=-1; fLabels[1]=-1; // most freq MC labels
104 fLabels[2]=0; // number of different labels for tracklet
105 fRefCov[0] = 1.; fRefCov[1] = 0.; fRefCov[2] = 1.;
106 // covariance matrix [diagonal]
107 // default sy = 200um and sz = 2.3 cm
108 fCov[0] = 4.e-4; fCov[1] = 0.; fCov[2] = 5.3;
109 SetStandAlone(kFALSE);
112 //____________________________________________________________________
113 AliTRDseedV1::AliTRDseedV1(const AliTRDseedV1 &ref)
114 :AliTRDtrackletBase((AliTRDtrackletBase&)ref)
138 // Copy Constructor performing a deep copy
143 SetBit(kOwner, kFALSE);
144 SetStandAlone(ref.IsStandAlone());
148 //____________________________________________________________________
149 AliTRDseedV1& AliTRDseedV1::operator=(const AliTRDseedV1 &ref)
152 // Assignment Operator using the copy function
158 SetBit(kOwner, kFALSE);
163 //____________________________________________________________________
164 AliTRDseedV1::~AliTRDseedV1()
167 // Destructor. The RecoParam object belongs to the underlying tracker.
170 //printf("I-AliTRDseedV1::~AliTRDseedV1() : Owner[%s]\n", IsOwner()?"YES":"NO");
173 for(int itb=0; itb<kNclusters; itb++){
174 if(!fClusters[itb]) continue;
175 //AliInfo(Form("deleting c %p @ %d", fClusters[itb], itb));
176 delete fClusters[itb];
177 fClusters[itb] = 0x0;
182 //____________________________________________________________________
183 void AliTRDseedV1::Copy(TObject &ref) const
190 AliTRDseedV1 &target = (AliTRDseedV1 &)ref;
192 target.fReconstructor = fReconstructor;
193 target.fClusterIter = 0x0;
197 target.fS2PRF = fS2PRF;
198 target.fDiffL = fDiffL;
199 target.fDiffT = fDiffT;
200 target.fClusterIdx = 0;
212 target.fChi2 = fChi2;
214 memcpy(target.fIndexes, fIndexes, kNclusters*sizeof(Int_t));
215 memcpy(target.fClusters, fClusters, kNclusters*sizeof(AliTRDcluster*));
216 memcpy(target.fPad, fPad, 3*sizeof(Float_t));
217 target.fYref[0] = fYref[0]; target.fYref[1] = fYref[1];
218 target.fZref[0] = fZref[0]; target.fZref[1] = fZref[1];
219 target.fYfit[0] = fYfit[0]; target.fYfit[1] = fYfit[1];
220 target.fZfit[0] = fZfit[0]; target.fZfit[1] = fZfit[1];
221 memcpy(target.fdEdx, fdEdx, kNslices*sizeof(Float_t));
222 memcpy(target.fProb, fProb, AliPID::kSPECIES*sizeof(Float_t));
223 memcpy(target.fLabels, fLabels, 3*sizeof(Int_t));
224 memcpy(target.fRefCov, fRefCov, 3*sizeof(Double_t));
225 memcpy(target.fCov, fCov, 3*sizeof(Double_t));
231 //____________________________________________________________
232 Bool_t AliTRDseedV1::Init(AliTRDtrackV1 *track)
234 // Initialize this tracklet using the track information
237 // track - the TRD track used to initialize the tracklet
239 // Detailed description
240 // The function sets the starting point and direction of the
241 // tracklet according to the information from the TRD track.
244 // The TRD track has to be propagated to the beginning of the
245 // chamber where the tracklet will be constructed
249 if(!track->GetProlongation(fX0, y, z)) return kFALSE;
255 //_____________________________________________________________________________
256 void AliTRDseedV1::Reset()
261 fExB=0.;fVD=0.;fT0=0.;fS2PRF=0.;
267 fdX=0.;fX0=0.; fX=0.; fY=0.; fZ=0.;
271 for(Int_t ic=kNclusters; ic--;) fIndexes[ic] = -1;
272 memset(fClusters, 0, kNclusters*sizeof(AliTRDcluster*));
273 memset(fPad, 0, 3*sizeof(Float_t));
274 fYref[0] = 0.; fYref[1] = 0.;
275 fZref[0] = 0.; fZref[1] = 0.;
276 fYfit[0] = 0.; fYfit[1] = 0.;
277 fZfit[0] = 0.; fZfit[1] = 0.;
278 memset(fdEdx, 0, kNslices*sizeof(Float_t));
279 for(int ispec=0; ispec<AliPID::kSPECIES; ispec++) fProb[ispec] = -1.;
280 fLabels[0]=-1; fLabels[1]=-1; // most freq MC labels
281 fLabels[2]=0; // number of different labels for tracklet
282 fRefCov[0] = 1.; fRefCov[1] = 0.; fRefCov[2] = 1.;
283 // covariance matrix [diagonal]
284 // default sy = 200um and sz = 2.3 cm
285 fCov[0] = 4.e-4; fCov[1] = 0.; fCov[2] = 5.3;
288 //____________________________________________________________________
289 void AliTRDseedV1::UpDate(const AliTRDtrackV1 *trk)
291 // update tracklet reference position from the TRD track
292 // Funny name to avoid the clash with the function AliTRDseed::Update() (has to be made obselete)
294 Double_t fSnp = trk->GetSnp();
295 Double_t fTgl = trk->GetTgl();
297 fYref[1] = fSnp/(1. - fSnp*fSnp);
299 SetCovRef(trk->GetCovariance());
301 Double_t dx = trk->GetX() - fX0;
302 fYref[0] = trk->GetY() - dx*fYref[1];
303 fZref[0] = trk->GetZ() - dx*fZref[1];
306 //_____________________________________________________________________________
307 void AliTRDseedV1::UpdateUsed()
310 // Calculate number of used clusers in the tracklet
313 Int_t nused = 0, nshared = 0;
314 for (Int_t i = kNclusters; i--; ) {
315 if (!fClusters[i]) continue;
316 if(fClusters[i]->IsUsed()){
318 } else if(fClusters[i]->IsShared()){
319 if(IsStandAlone()) nused++;
327 //_____________________________________________________________________________
328 void AliTRDseedV1::UseClusters()
333 // In stand alone mode:
334 // Clusters which are marked as used or shared from another track are
335 // removed from the tracklet
338 // - Clusters which are used by another track become shared
339 // - Clusters which are attached to a kink track become shared
341 AliTRDcluster **c = &fClusters[0];
342 for (Int_t ic=kNclusters; ic--; c++) {
345 if((*c)->IsShared() || (*c)->IsUsed()){
346 if((*c)->IsShared()) SetNShared(GetNShared()-1);
347 else SetNUsed(GetNUsed()-1);
354 if((*c)->IsUsed() || IsKink()){
365 //____________________________________________________________________
366 void AliTRDseedV1::CookdEdx(Int_t nslices)
368 // Calculates average dE/dx for all slices and store them in the internal array fdEdx.
371 // nslices : number of slices for which dE/dx should be calculated
373 // store results in the internal array fdEdx. This can be accessed with the method
374 // AliTRDseedV1::GetdEdx()
376 // Detailed description
377 // Calculates average dE/dx for all slices. Depending on the PID methode
378 // the number of slices can be 3 (LQ) or 8(NN).
379 // The calculation of dQ/dl are done using the tracklet fit results (see AliTRDseedV1::GetdQdl(Int_t))
381 // The following effects are included in the calculation:
382 // 1. calibration values for t0 and vdrift (using x coordinate to calculate slice)
383 // 2. cluster sharing (optional see AliTRDrecoParam::SetClusterSharing())
387 Int_t nclusters[kNslices];
388 memset(nclusters, 0, kNslices*sizeof(Int_t));
389 memset(fdEdx, 0, kNslices*sizeof(Float_t));
391 const Double_t kDriftLength = (.5 * AliTRDgeometry::AmThick() + AliTRDgeometry::DrThick());
393 AliTRDcluster *c = 0x0;
394 for(int ic=0; ic<AliTRDtrackerV1::GetNTimeBins(); ic++){
395 if(!(c = fClusters[ic]) && !(c = fClusters[ic+kNtb])) continue;
396 Float_t dx = TMath::Abs(fX0 - c->GetX());
398 // Filter clusters for dE/dx calculation
400 // 1.consider calibration effects for slice determination
402 if(dx<kDriftLength){ // TODO should be replaced by c->IsInChamber()
403 slice = Int_t(dx * nslices / kDriftLength);
404 } else slice = c->GetX() < fX0 ? nslices-1 : 0;
407 // 2. take sharing into account
408 Float_t w = /*c->IsShared() ? .5 :*/ 1.;
410 // 3. take into account large clusters TODO
411 //w *= c->GetNPads() > 3 ? .8 : 1.;
414 fdEdx[slice] += w * GetdQdl(ic); //fdQdl[ic];
416 } // End of loop over clusters
418 //if(fReconstructor->GetPIDMethod() == AliTRDReconstructor::kLQPID){
419 if(nslices == AliTRDpidUtil::kLQslices){
420 // calculate mean charge per slice (only LQ PID)
421 for(int is=0; is<nslices; is++){
422 if(nclusters[is]) fdEdx[is] /= nclusters[is];
427 //_____________________________________________________________________________
428 void AliTRDseedV1::CookLabels()
431 // Cook 2 labels for seed
437 for (Int_t i = 0; i < kNclusters; i++) {
438 if (!fClusters[i]) continue;
439 for (Int_t ilab = 0; ilab < 3; ilab++) {
440 if (fClusters[i]->GetLabel(ilab) >= 0) {
441 labels[nlab] = fClusters[i]->GetLabel(ilab);
447 fLabels[2] = AliMathBase::Freq(nlab,labels,out,kTRUE);
449 if ((fLabels[2] > 1) && (out[3] > 1)) fLabels[1] = out[2];
453 //____________________________________________________________________
454 void AliTRDseedV1::GetClusterXY(const AliTRDcluster *c, Double_t &x, Double_t &y)
456 // Return corrected position of the cluster taking into
457 // account variation of the drift velocity with drift length.
460 // drift velocity correction TODO to be moved to the clusterizer
461 const Float_t cx[] = {
462 -9.6280e-02, 1.3091e-01,-1.7415e-02,-9.9221e-02,-1.2040e-01,-9.5493e-02,
463 -5.0041e-02,-1.6726e-02, 3.5756e-03, 1.8611e-02, 2.6378e-02, 3.3823e-02,
464 3.4811e-02, 3.5282e-02, 3.5386e-02, 3.6047e-02, 3.5201e-02, 3.4384e-02,
465 3.2864e-02, 3.1932e-02, 3.2051e-02, 2.2539e-02,-2.5154e-02,-1.2050e-01,
469 // PRF correction TODO to be replaced by the gaussian
470 // approximation with full error parametrization and // moved to the clusterizer
471 const Float_t cy[AliTRDgeometry::kNlayer][3] = {
472 { 4.014e-04, 8.605e-03, -6.880e+00},
473 {-3.061e-04, 9.663e-03, -6.789e+00},
474 { 1.124e-03, 1.105e-02, -6.825e+00},
475 {-1.527e-03, 1.231e-02, -6.777e+00},
476 { 2.150e-03, 1.387e-02, -6.783e+00},
477 {-1.296e-03, 1.486e-02, -6.825e+00}
480 Int_t ily = AliTRDgeometry::GetLayer(c->GetDetector());
481 x = c->GetX() - cx[c->GetLocalTimeBin()];
482 y = c->GetY() + cy[ily][0] + cy[ily][1] * TMath::Sin(cy[ily][2] * c->GetCenter());
486 //____________________________________________________________________
487 Float_t AliTRDseedV1::GetdQdl(Int_t ic) const
489 // Using the linear approximation of the track inside one TRD chamber (TRD tracklet)
490 // the charge per unit length can be written as:
492 // #frac{dq}{dl} = #frac{q_{c}}{dx * #sqrt{1 + #(){#frac{dy}{dx}}^{2}_{fit} + #(){#frac{dy}{dx}}^{2}_{ref}}}
494 // where qc is the total charge collected in the current time bin and dx is the length
495 // of the time bin. For the moment (Jan 20 2009) only pad row cross corrections are
496 // considered for the charge but none are applied for drift velocity variations along
497 // the drift region or assymetry of the TRF
499 // Author : Alex Bercuci <A.Bercuci@gsi.de>
502 if(fClusters[ic]) dq += TMath::Abs(fClusters[ic]->GetQ());
503 if(fClusters[ic+kNtb]) dq += TMath::Abs(fClusters[ic+kNtb]->GetQ());
504 if(dq<1.e-3 || fdX < 1.e-3) return 0.;
506 return dq/fdX/TMath::Sqrt(1. + fYfit[1]*fYfit[1] + fZref[1]*fZref[1]);
509 //____________________________________________________________________
510 Float_t* AliTRDseedV1::GetProbability(Bool_t force)
512 if(!force) return &fProb[0];
513 if(!CookPID()) return 0x0;
517 //____________________________________________________________
518 Bool_t AliTRDseedV1::CookPID()
520 // Fill probability array for tracklet from the DB.
525 // returns pointer to the probability array and 0x0 if missing DB access
527 // Detailed description
530 // retrive calibration db
531 AliTRDcalibDB *calibration = AliTRDcalibDB::Instance();
533 AliError("No access to calibration data");
537 if (!fReconstructor) {
538 AliError("Reconstructor not set.");
542 // Retrieve the CDB container class with the parametric detector response
543 const AliTRDCalPID *pd = calibration->GetPIDObject(fReconstructor->GetPIDMethod());
545 AliError("No access to AliTRDCalPID object");
548 //AliInfo(Form("Method[%d] : %s", fReconstructor->GetRecoParam() ->GetPIDMethod(), pd->IsA()->GetName()));
550 // calculate tracklet length TO DO
551 Float_t length = (AliTRDgeometry::AmThick() + AliTRDgeometry::DrThick());
552 /// TMath::Sqrt((1.0 - fSnp[iPlane]*fSnp[iPlane]) / (1.0 + fTgl[iPlane]*fTgl[iPlane]));
555 CookdEdx(fReconstructor->GetNdEdxSlices());
557 // Sets the a priori probabilities
558 for(int ispec=0; ispec<AliPID::kSPECIES; ispec++) {
559 fProb[ispec] = pd->GetProbability(ispec, fMom, &fdEdx[0], length, GetPlane());
565 //____________________________________________________________________
566 Float_t AliTRDseedV1::GetQuality(Bool_t kZcorr) const
569 // Returns a quality measurement of the current seed
572 Float_t zcorr = kZcorr ? GetTilt() * (fZfit[0] - fZref[0]) : 0.;
574 .5 * TMath::Abs(18.0 - GetN())
575 + 10.* TMath::Abs(fYfit[1] - fYref[1])
576 + 5. * TMath::Abs(fYfit[0] - fYref[0] + zcorr)
577 + 2. * TMath::Abs(fZfit[0] - fZref[0]) / GetPadLength();
580 //____________________________________________________________________
581 void AliTRDseedV1::GetCovAt(Double_t x, Double_t *cov) const
583 // Computes covariance in the y-z plane at radial point x (in tracking coordinates)
584 // and returns the results in the preallocated array cov[3] as :
591 // For the linear transformation
595 // The error propagation has the general form
597 // C_{Y} = T_{x} C_{X} T_{x}^{T}
599 // We apply this formula 2 times. First to calculate the covariance of the tracklet
600 // at point x we consider:
602 // T_{x} = (1 x); X=(y0 dy/dx); C_{X}=#(){#splitline{Var(y0) Cov(y0, dy/dx)}{Cov(y0, dy/dx) Var(dy/dx)}}
604 // and secondly to take into account the tilt angle
606 // T_{#alpha} = #(){#splitline{cos(#alpha) __ sin(#alpha)}{-sin(#alpha) __ cos(#alpha)}}; X=(y z); C_{X}=#(){#splitline{Var(y) 0}{0 Var(z)}}
609 // using simple trigonometrics one can write for this last case
611 // C_{Y}=#frac{1}{1+tg^{2}#alpha} #(){#splitline{(#sigma_{y}^{2}+tg^{2}#alpha#sigma_{z}^{2}) __ tg#alpha(#sigma_{z}^{2}-#sigma_{y}^{2})}{tg#alpha(#sigma_{z}^{2}-#sigma_{y}^{2}) __ (#sigma_{z}^{2}+tg^{2}#alpha#sigma_{y}^{2})}}
613 // which can be aproximated for small alphas (2 deg) with
615 // C_{Y}=#(){#splitline{#sigma_{y}^{2} __ (#sigma_{z}^{2}-#sigma_{y}^{2})tg#alpha}{((#sigma_{z}^{2}-#sigma_{y}^{2})tg#alpha __ #sigma_{z}^{2}}}
618 // before applying the tilt rotation we also apply systematic uncertainties to the tracklet
619 // position which can be tunned from outside via the AliTRDrecoParam::SetSysCovMatrix(). They might
620 // account for extra misalignment/miscalibration uncertainties.
623 // Alex Bercuci <A.Bercuci@gsi.de>
624 // Date : Jan 8th 2009
629 Double_t sy2 = fCov[0] +2.*xr*fCov[1] + xr*xr*fCov[2];
630 Double_t sz2 = GetPadLength()*GetPadLength()/12.;
632 // insert systematic uncertainties
634 fReconstructor->GetRecoParam()->GetSysCovMatrix(sys);
638 // rotate covariance matrix
639 Double_t t2 = GetTilt()*GetTilt();
640 Double_t correction = 1./(1. + t2);
641 cov[0] = (sy2+t2*sz2)*correction;
642 cov[1] = GetTilt()*(sz2 - sy2)*correction;
643 cov[2] = (t2*sy2+sz2)*correction;
647 //____________________________________________________________________
648 void AliTRDseedV1::Calibrate()
650 // Retrieve calibration and position parameters from OCDB.
651 // The following information are used
653 // - column and row position of first attached cluster. If no clusters are attached
654 // to the tracklet a random central chamber position (c=70, r=7) will be used.
656 // The following information is cached in the tracklet
657 // t0 (trigger delay)
660 // omega*tau = tg(a_L)
661 // diffusion coefficients (longitudinal and transversal)
664 // Alex Bercuci <A.Bercuci@gsi.de>
665 // Date : Jan 8th 2009
668 AliCDBManager *cdb = AliCDBManager::Instance();
669 if(cdb->GetRun() < 0){
670 AliError("OCDB manager not properly initialized");
674 AliTRDcalibDB *calib = AliTRDcalibDB::Instance();
675 AliTRDCalROC *vdROC = calib->GetVdriftROC(fDet),
676 *t0ROC = calib->GetT0ROC(fDet);;
677 const AliTRDCalDet *vdDet = calib->GetVdriftDet();
678 const AliTRDCalDet *t0Det = calib->GetT0Det();
680 Int_t col = 70, row = 7;
681 AliTRDcluster **c = &fClusters[0];
684 while (ic<kNclusters && !(*c)){ic++; c++;}
686 col = (*c)->GetPadCol();
687 row = (*c)->GetPadRow();
691 fT0 = t0Det->GetValue(fDet) + t0ROC->GetValue(col,row);
692 fVD = vdDet->GetValue(fDet) * vdROC->GetValue(col, row);
693 fS2PRF = calib->GetPRFWidth(fDet, col, row); fS2PRF *= fS2PRF;
694 fExB = AliTRDCommonParam::Instance()->GetOmegaTau(fVD);
695 AliTRDCommonParam::Instance()->GetDiffCoeff(fDiffL,
697 SetBit(kCalib, kTRUE);
700 //____________________________________________________________________
701 void AliTRDseedV1::SetOwner()
703 //AliInfo(Form("own [%s] fOwner[%s]", own?"YES":"NO", fOwner?"YES":"NO"));
705 if(TestBit(kOwner)) return;
706 for(int ic=0; ic<kNclusters; ic++){
707 if(!fClusters[ic]) continue;
708 fClusters[ic] = new AliTRDcluster(*fClusters[ic]);
713 // //____________________________________________________________________
714 // Bool_t AliTRDseedV1::AttachClustersIter(AliTRDtrackingChamber *chamber, Float_t quality, Bool_t kZcorr, AliTRDcluster *c)
717 // // Iterative process to register clusters to the seed.
718 // // In iteration 0 we try only one pad-row and if quality not
719 // // sufficient we try 2 pad-rows (about 5% of tracks cross 2 pad-rows)
724 // if(!fReconstructor->GetRecoParam() ){
725 // AliError("Seed can not be used without a valid RecoParam.");
729 // AliTRDchamberTimeBin *layer = 0x0;
730 // if(fReconstructor->GetStreamLevel(AliTRDReconstructor::kTracker)>=7){
731 // AliTRDtrackingChamber ch(*chamber);
733 // TTreeSRedirector &cstreamer = *fReconstructor->GetDebugStream(AliTRDReconstructor::kTracker);
734 // cstreamer << "AttachClustersIter"
735 // << "chamber.=" << &ch
736 // << "tracklet.=" << this
741 // Double_t kroady = fReconstructor->GetRecoParam() ->GetRoad1y();
742 // Double_t kroadz = GetPadLength() * .5 + 1.;
744 // // initialize configuration parameters
745 // Float_t zcorr = kZcorr ? GetTilt() * (fZfit[0] - fZref[0]) : 0.;
746 // Int_t niter = kZcorr ? 1 : 2;
748 // Double_t yexp, zexp;
750 // // start seed update
751 // for (Int_t iter = 0; iter < niter; iter++) {
753 // for (Int_t iTime = 0; iTime < AliTRDtrackerV1::GetNTimeBins(); iTime++) {
754 // if(!(layer = chamber->GetTB(iTime))) continue;
755 // if(!Int_t(*layer)) continue;
757 // // define searching configuration
758 // Double_t dxlayer = layer->GetX() - fX0;
761 // //Try 2 pad-rows in second iteration
763 // zexp = fZref[0] + fZref[1] * dxlayer - zcorr;
764 // if (zexp > c->GetZ()) zexp = c->GetZ() + GetPadLength()*0.5;
765 // if (zexp < c->GetZ()) zexp = c->GetZ() - GetPadLength()*0.5;
767 // } else zexp = fZref[0] + (kZcorr ? fZref[1] * dxlayer : 0.);
768 // yexp = fYref[0] + fYref[1] * dxlayer - zcorr;
770 // // Get and register cluster
771 // Int_t index = layer->SearchNearestCluster(yexp, zexp, kroady, kroadz);
772 // if (index < 0) continue;
773 // AliTRDcluster *cl = (*layer)[index];
775 // fIndexes[iTime] = layer->GetGlobalIndex(index);
776 // fClusters[iTime] = cl;
777 // // fY[iTime] = cl->GetY();
778 // // fZ[iTime] = cl->GetZ();
781 // if(fReconstructor->GetStreamLevel(AliTRDReconstructor::kTracker)>=7) AliInfo(Form("iter = %d ncl [%d] = %d", iter, fDet, ncl));
784 // // calculate length of the time bin (calibration aware)
785 // Int_t irp = 0; Float_t x[2]={0., 0.}; Int_t tb[2] = {0,0};
786 // for (Int_t iTime = 0; iTime < AliTRDtrackerV1::GetNTimeBins(); iTime++) {
787 // if(!fClusters[iTime]) continue;
788 // x[irp] = fClusters[iTime]->GetX();
793 // Int_t dtb = tb[1] - tb[0];
794 // fdX = dtb ? (x[0] - x[1]) / dtb : 0.15;
796 // // update X0 from the clusters (calibration/alignment aware)
797 // for (Int_t iTime = 0; iTime < AliTRDtrackerV1::GetNTimeBins(); iTime++) {
798 // if(!(layer = chamber->GetTB(iTime))) continue;
799 // if(!layer->IsT0()) continue;
800 // if(fClusters[iTime]){
801 // fX0 = fClusters[iTime]->GetX();
803 // } else { // we have to infere the position of the anode wire from the other clusters
804 // for (Int_t jTime = iTime+1; jTime < AliTRDtrackerV1::GetNTimeBins(); jTime++) {
805 // if(!fClusters[jTime]) continue;
806 // fX0 = fClusters[jTime]->GetX() + fdX * (jTime - iTime);
812 // // update YZ reference point
815 // // update x reference positions (calibration/alignment aware)
816 // // for (Int_t iTime = 0; iTime < AliTRDtrackerV1::GetNTimeBins(); iTime++) {
817 // // if(!fClusters[iTime]) continue;
818 // // fX[iTime] = fX0 - fClusters[iTime]->GetX();
823 // if(fReconstructor->GetStreamLevel(AliTRDReconstructor::kTracker)>=7) AliInfo(Form("iter = %d nclFit [%d] = %d", iter, fDet, fN2));
826 // tquality = GetQuality(kZcorr);
827 // if(tquality < quality) break;
828 // else quality = tquality;
832 // if (!IsOK()) return kFALSE;
834 // if(fReconstructor->GetStreamLevel(AliTRDReconstructor::kTracker)>=1) CookLabels();
836 // // load calibration params
842 //____________________________________________________________________
843 Bool_t AliTRDseedV1::AttachClusters(AliTRDtrackingChamber *chamber, Bool_t tilt)
846 // Projective algorithm to attach clusters to seeding tracklets
852 // Detailed description
853 // 1. Collapse x coordinate for the full detector plane
854 // 2. truncated mean on y (r-phi) direction
856 // 4. truncated mean on z direction
860 Bool_t kPRINT = kFALSE;
861 if(!fReconstructor->GetRecoParam() ){
862 AliError("Seed can not be used without a valid RecoParam.");
865 // Initialize reco params for this tracklet
866 // 1. first time bin in the drift region
868 Int_t kClmin = Int_t(fReconstructor->GetRecoParam() ->GetFindableClusters()*AliTRDtrackerV1::GetNTimeBins());
870 Double_t syRef = TMath::Sqrt(fRefCov[0]);
872 Double_t kroady = 1.;
873 //fReconstructor->GetRecoParam() ->GetRoad1y();
874 Double_t kroadz = GetPadLength() * 1.5 + 1.;
875 if(kPRINT) printf("AttachClusters() sy[%f] road[%f]\n", syRef, kroady);
878 const Int_t kNrows = 16;
879 AliTRDcluster *clst[kNrows][kNclusters];
880 Double_t cond[4], dx, dy, yt, zt,
881 yres[kNrows][kNclusters];
882 Int_t idxs[kNrows][kNclusters], ncl[kNrows], ncls = 0;
883 memset(ncl, 0, kNrows*sizeof(Int_t));
884 memset(clst, 0, kNrows*kNclusters*sizeof(AliTRDcluster*));
886 // Do cluster projection
887 AliTRDcluster *c = 0x0;
888 AliTRDchamberTimeBin *layer = 0x0;
889 Bool_t kBUFFER = kFALSE;
890 for (Int_t it = 0; it < AliTRDtrackerV1::GetNTimeBins(); it++) {
891 if(!(layer = chamber->GetTB(it))) continue;
892 if(!Int_t(*layer)) continue;
894 dx = fX0 - layer->GetX();
895 yt = fYref[0] - fYref[1] * dx;
896 zt = fZref[0] - fZref[1] * dx;
897 if(kPRINT) printf("\t%2d dx[%f] yt[%f] zt[%f]\n", it, dx, yt, zt);
899 // select clusters on a 5 sigmaKalman level
900 cond[0] = yt; cond[2] = kroady;
901 cond[1] = zt; cond[3] = kroadz;
903 layer->GetClusters(cond, idx, n, 6);
904 for(Int_t ic = n; ic--;){
905 c = (*layer)[idx[ic]];
907 dy += tilt ? GetTilt() * (c->GetZ() - zt) : 0.;
908 // select clusters on a 3 sigmaKalman level
909 /* if(tilt && TMath::Abs(dy) > 3.*syRef){
910 printf("too large !!!\n");
913 Int_t r = c->GetPadRow();
914 if(kPRINT) printf("\t\t%d dy[%f] yc[%f] r[%d]\n", ic, TMath::Abs(dy), c->GetY(), r);
916 idxs[r][ncl[r]] = idx[ic];
917 yres[r][ncl[r]] = dy;
920 if(ncl[r] >= kNclusters) {
921 AliWarning(Form("Cluster candidates reached limit %d. Some may be lost.", kNclusters));
928 if(kPRINT) printf("Found %d clusters\n", ncls);
929 if(ncls<kClmin) return kFALSE;
931 // analyze each row individualy
932 Double_t mean, syDis;
933 Int_t nrow[] = {0, 0, 0}, nr = 0, lr=-1;
934 for(Int_t ir=kNrows; ir--;){
935 if(!(ncl[ir])) continue;
936 if(lr>0 && lr-ir != 1){
937 if(kPRINT) printf("W - gap in rows attached !!\n");
939 if(kPRINT) printf("\tir[%d] lr[%d] n[%d]\n", ir, lr, ncl[ir]);
940 // Evaluate truncated mean on the y direction
941 if(ncl[ir] > 3) AliMathBase::EvaluateUni(ncl[ir], yres[ir], mean, syDis, Int_t(ncl[ir]*.8));
943 mean = 0.; syDis = 0.;
946 // TODO check mean and sigma agains cluster resolution !!
947 if(kPRINT) printf("\tr[%2d] m[%f %5.3fsigma] s[%f]\n", ir, mean, TMath::Abs(mean/syRef), syDis);
948 // select clusters on a 3 sigmaDistr level
949 Bool_t kFOUND = kFALSE;
950 for(Int_t ic = ncl[ir]; ic--;){
951 if(yres[ir][ic] - mean > 3. * syDis){
952 clst[ir][ic] = 0x0; continue;
954 nrow[nr]++; kFOUND = kTRUE;
958 lr = ir; if(nr>=3) break;
960 if(kPRINT) printf("lr[%d] nr[%d] nrow[0]=%d nrow[1]=%d nrow[2]=%d\n", lr, nr, nrow[0], nrow[1], nrow[2]);
962 // classify cluster rows
969 SetBit(kRowCross, kTRUE); // mark pad row crossing
970 if(nrow[0] > nrow[1]){ row = lr+1; lr = -1;}
979 SetBit(kRowCross, kTRUE); // mark pad row crossing
982 if(kPRINT) printf("\trow[%d] n[%d]\n\n", row, nrow[0]);
983 if(row<0) return kFALSE;
985 // Select and store clusters
986 // We should consider here :
987 // 1. How far is the chamber boundary
988 // 2. How big is the mean
990 for (Int_t ir = 0; ir < nr; ir++) {
991 Int_t jr = row + ir*lr;
992 if(kPRINT) printf("\tattach %d clusters for row %d\n", ncl[jr], jr);
993 for (Int_t ic = 0; ic < ncl[jr]; ic++) {
994 if(!(c = clst[jr][ic])) continue;
995 Int_t it = c->GetPadTime();
996 // TODO proper indexing of clusters !!
997 fIndexes[it+kNtb*ir] = chamber->GetTB(it)->GetGlobalIndex(idxs[jr][ic]);
998 fClusters[it+kNtb*ir] = c;
1000 //printf("\tid[%2d] it[%d] idx[%d]\n", ic, it, fIndexes[it]);
1006 // number of minimum numbers of clusters expected for the tracklet
1008 //AliWarning(Form("Not enough clusters to fit the tracklet %d [%d].", n, kClmin));
1013 // Load calibration parameters for this tracklet
1016 // calculate dx for time bins in the drift region (calibration aware)
1017 Int_t irp = 0; Float_t x[2] = {0.,0.}; Int_t tb[2]={0,0};
1018 for (Int_t it = t0; it < AliTRDtrackerV1::GetNTimeBins(); it++) {
1019 if(!fClusters[it]) continue;
1020 x[irp] = fClusters[it]->GetX();
1025 Int_t dtb = tb[1] - tb[0];
1026 fdX = dtb ? (x[0] - x[1]) / dtb : 0.15;
1028 // update X0 from the clusters (calibration/alignment aware) TODO remove dependence on x0 !!
1029 for (Int_t it = 0; it < AliTRDtrackerV1::GetNTimeBins(); it++) {
1030 if(!(layer = chamber->GetTB(it))) continue;
1031 if(!layer->IsT0()) continue;
1033 fX0 = fClusters[it]->GetX();
1035 } else { // we have to infere the position of the anode wire from the other clusters
1036 for (Int_t jt = it+1; jt < AliTRDtrackerV1::GetNTimeBins(); jt++) {
1037 if(!fClusters[jt]) continue;
1038 fX0 = fClusters[jt]->GetX() + fdX * (jt - it);
1047 //____________________________________________________________
1048 void AliTRDseedV1::Bootstrap(const AliTRDReconstructor *rec)
1050 // Fill in all derived information. It has to be called after recovery from file or HLT.
1051 // The primitive data are
1052 // - list of clusters
1053 // - detector (as the detector will be removed from clusters)
1054 // - position of anode wire (fX0) - temporary
1055 // - track reference position and direction
1056 // - momentum of the track
1057 // - time bin length [cm]
1059 // A.Bercuci <A.Bercuci@gsi.de> Oct 30th 2008
1061 fReconstructor = rec;
1063 AliTRDpadPlane *pp = g.GetPadPlane(fDet);
1064 fPad[0] = pp->GetLengthIPad();
1065 fPad[1] = pp->GetWidthIPad();
1066 fPad[3] = TMath::Tan(TMath::DegToRad()*pp->GetTiltingAngle());
1067 //fSnp = fYref[1]/TMath::Sqrt(1+fYref[1]*fYref[1]);
1069 Int_t n = 0, nshare = 0, nused = 0;
1070 AliTRDcluster **cit = &fClusters[0];
1071 for(Int_t ic = kNclusters; ic--; cit++){
1074 if((*cit)->IsShared()) nshare++;
1075 if((*cit)->IsUsed()) nused++;
1077 SetN(n); SetNUsed(nused); SetNShared(nshare);
1084 //____________________________________________________________________
1085 Bool_t AliTRDseedV1::Fit(Bool_t tilt, Int_t errors)
1088 // Linear fit of the tracklet
1093 // True if successful
1095 // Detailed description
1096 // 2. Check if tracklet crosses pad row boundary
1097 // 1. Calculate residuals in the y (r-phi) direction
1098 // 3. Do a Least Square Fit to the data
1101 if(!IsCalibrated()){
1102 AliWarning("Tracklet fit failed. Call Calibrate().");
1106 const Int_t kClmin = 8;
1109 // cluster error parametrization parameters
1110 // 1. sy total charge
1111 const Float_t sq0inv = 0.019962; // [1/q0]
1112 const Float_t sqb = 1.0281564; //[cm]
1113 // 2. sy for the PRF
1114 const Float_t scy[AliTRDgeometry::kNlayer][4] = {
1115 {2.827e-02, 9.600e-04, 4.296e-01, 2.271e-02},
1116 {2.952e-02,-2.198e-04, 4.146e-01, 2.339e-02},
1117 {3.090e-02, 1.514e-03, 4.020e-01, 2.402e-02},
1118 {3.260e-02,-2.037e-03, 3.946e-01, 2.509e-02},
1119 {3.439e-02,-3.601e-04, 3.883e-01, 2.623e-02},
1120 {3.510e-02, 2.066e-03, 3.651e-01, 2.588e-02},
1122 // 3. sy parallel to the track
1123 const Float_t sy0 = 2.649e-02; // [cm]
1124 const Float_t sya = -8.864e-04; // [cm]
1125 const Float_t syb = -2.435e-01; // [cm]
1127 // 4. sx parallel to the track
1128 const Float_t sxgc = 5.427e-02;
1129 const Float_t sxgm = 7.783e-01;
1130 const Float_t sxgs = 2.743e-01;
1131 const Float_t sxe0 =-2.065e+00;
1132 const Float_t sxe1 =-2.978e-02;
1134 // 5. sx perpendicular to the track
1135 // const Float_t sxd0 = 1.881e-02;
1136 // const Float_t sxd1 =-4.101e-01;
1137 // const Float_t sxd2 = 1.572e+00;
1139 // get track direction
1140 Double_t y0 = fYref[0];
1141 Double_t dydx = fYref[1];
1142 Double_t z0 = fZref[0];
1143 Double_t dzdx = fZref[1];
1146 // calculation of tg^2(phi - a_L) and tg^2(a_L)
1147 Double_t tgg = (dydx-fExB)/(1.+dydx*fExB); tgg *= tgg;
1148 //Double_t exb2= fExB*fExB;
1150 //AliTRDtrackerV1::AliTRDLeastSquare fitterZ;
1151 TLinearFitter fitterY(1, "pol1");
1152 // convertion factor from square to gauss distribution for sigma
1153 //Double_t convert = 1./TMath::Sqrt(12.);
1155 // book cluster information
1156 Double_t qc[kNclusters], xc[kNclusters], yc[kNclusters], zc[kNclusters], sy[kNclusters];
1158 Int_t ily = AliTRDgeometry::GetLayer(fDet);
1160 AliTRDcluster *c=0x0, **jc = &fClusters[0];
1161 for (Int_t ic=0; ic<kNtb; ic++, ++jc) {
1168 if(!(c = (*jc))) continue;
1169 if(!c->IsInChamber()) continue;
1172 if(c->GetNPads()>4) w = .5;
1173 if(c->GetNPads()>5) w = .2;
1175 //zRow[fN] = c->GetPadRow();
1176 qc[n] = TMath::Abs(c->GetQ());
1177 // correct cluster position for PRF and v drift
1178 //Int_t jc = TMath::Max(fN-3, 0);
1179 //xc[fN] = c->GetXloc(fT0, fVD, &qc[jc], &xc[jc]/*, z0 - c->GetX()*dzdx*/);
1180 //Double_t s2 = fS2PRF + fDiffL*fDiffL*xc[fN]/(1.+2.*exb2)+tgg*xc[fN]*xc[fN]*exb2/12.;
1181 //yc[fN] = c->GetYloc(s2, GetPadWidth(), xc[fN], fExB);
1183 // uncalibrated cluster correction
1185 Double_t x, y; GetClusterXY(c, x, y);
1190 // extrapolated y value for the track
1191 yt = y0 - xc[n]*dydx;
1192 // extrapolated z value for the track
1193 zt = z0 - xc[n]*dzdx;
1195 if(tilt) yc[n] -= GetTilt()*(zc[n] - zt);
1197 // ELABORATE CLUSTER ERROR
1198 // TODO to be moved to AliTRDcluster
1199 // basic y error (|| to track).
1200 sy[n] = xc[n] < AliTRDgeometry::CamHght() ? 2. : sy0 + sya*TMath::Exp(1./(xc[n]+syb));
1201 //printf("cluster[%d]\n\tsy[0] = %5.3e [um]\n", fN, sy[fN]*1.e4);
1202 // y error due to total charge
1203 sy[n] += sqb*(1./qc[n] - sq0inv);
1204 //printf("\tsy[1] = %5.3e [um]\n", sy[fN]*1.e4);
1205 // y error due to PRF
1206 sy[n] += scy[ily][0]*TMath::Gaus(c->GetCenter(), scy[ily][1], scy[ily][2]) - scy[ily][3];
1207 //printf("\tsy[2] = %5.3e [um]\n", sy[fN]*1.e4);
1212 // error of drift length parallel to the track
1213 Double_t sx = sxgc*TMath::Gaus(xc[n], sxgm, sxgs) + TMath::Exp(sxe0+sxe1*xc[n]); // [cm]
1214 //printf("\tsx[0] = %5.3e [um]\n", sx*1.e4);
1215 // error of drift length perpendicular to the track
1216 //sx += sxd0 + sxd1*d + sxd2*d*d;
1217 sx *= sx; // square sx
1219 // add error from ExB
1220 if(errors>0) sy[n] += fExB*fExB*sx;
1221 //printf("\tsy[3] = %5.3e [um^2]\n", sy[fN]*1.e8);
1223 // global radial error due to misalignment/miscalibration
1224 Double_t sx0 = 0.; sx0 *= sx0;
1225 // add sx contribution to sy due to track angle
1226 if(errors>1) sy[n] += tgg*(sx+sx0);
1227 // TODO we should add tilt pad correction here
1228 //printf("\tsy[4] = %5.3e [um^2]\n", sy[fN]*1.e8);
1229 c->SetSigmaY2(sy[n]);
1231 sy[n] = TMath::Sqrt(sy[n]);
1232 fitterY.AddPoint(&xc[n], yc[n], sy[n]);
1236 if (n < kClmin) return kFALSE;
1240 fYfit[0] = fitterY.GetParameter(0);
1241 fYfit[1] = -fitterY.GetParameter(1);
1243 Double_t *p = fitterY.GetCovarianceMatrix();
1244 fCov[0] = p[0]; // variance of y0
1245 fCov[1] = p[1]; // covariance of y0, dydx
1246 fCov[2] = p[3]; // variance of dydx
1247 // the ref radial position is set at the minimum of
1248 // the y variance of the tracklet
1249 fX = -fCov[1]/fCov[2]; //fXref = fX0 - fXref;
1250 fS2Y = fCov[0] +2.*fX*fCov[1] + fX*fX*fCov[2];
1254 // TODO pad row cross position estimation !!!
1255 //AliInfo(Form("Padrow cross in detector %d", fDet));
1256 fZfit[0] = .5*(zc[0]+zc[n-1]); fZfit[1] = 0.;
1257 fS2Z = 0.02+1.55*fZref[1]; fS2Z *= fS2Z;
1259 fZfit[0] = zc[0]; fZfit[1] = 0.;
1260 fS2Z = GetPadLength()*GetPadLength()/12.;
1264 // // determine z offset of the fit
1265 // Float_t zslope = 0.;
1266 // Int_t nchanges = 0, nCross = 0;
1267 // if(nz==2){ // tracklet is crossing pad row
1268 // // Find the break time allowing one chage on pad-rows
1269 // // with maximal number of accepted clusters
1270 // Int_t padRef = zRow[0];
1271 // for (Int_t ic=1; ic<fN; ic++) {
1272 // if(zRow[ic] == padRef) continue;
1275 // if(zRow[ic-1] == zRow[ic]){
1276 // printf("ERROR in pad row change!!!\n");
1279 // // evaluate parameters of the crossing point
1280 // Float_t sx = (xc[ic-1] - xc[ic])*convert;
1281 // fCross[0] = .5 * (xc[ic-1] + xc[ic]);
1282 // fCross[2] = .5 * (zc[ic-1] + zc[ic]);
1283 // fCross[3] = TMath::Max(dzdx * sx, .01);
1284 // zslope = zc[ic-1] > zc[ic] ? 1. : -1.;
1285 // padRef = zRow[ic];
1291 // // condition on nCross and reset nchanges TODO
1294 // if(dzdx * zslope < 0.){
1295 // AliInfo("Tracklet-Track mismatch in dzdx. TODO.");
1299 // //zc[nc] = fitterZ.GetFunctionParameter(0);
1300 // fCross[1] = fYfit[0] - fCross[0] * fYfit[1];
1301 // fCross[0] = fX0 - fCross[0];
1309 //_____________________________________________________________________________
1310 void AliTRDseedV1::FitMI()
1314 // Marian Ivanov's version
1316 // linear fit on the y direction with respect to the reference direction.
1317 // The residuals for each x (x = xc - x0) are deduced from:
1319 // the tilting correction is written :
1320 // y = yc + h*(zc-zt) (2)
1321 // yt = y0+dy/dx*x (3)
1322 // zt = z0+dz/dx*x (4)
1323 // from (1),(2),(3) and (4)
1324 // dy = yc - y0 - (dy/dx + h*dz/dx)*x + h*(zc-z0)
1325 // the last term introduces the correction on y direction due to tilting pads. There are 2 ways to account for this:
1326 // 1. use tilting correction for calculating the y
1327 // 2. neglect tilting correction here and account for it in the error parametrization of the tracklet.
1328 const Float_t kRatio = 0.8;
1329 const Int_t kClmin = 5;
1330 const Float_t kmaxtan = 2;
1332 if (TMath::Abs(fYref[1]) > kmaxtan){
1333 //printf("Exit: Abs(fYref[1]) = %3.3f, kmaxtan = %3.3f\n", TMath::Abs(fYref[1]), kmaxtan);
1334 return; // Track inclined too much
1337 Float_t sigmaexp = 0.05 + TMath::Abs(fYref[1] * 0.25); // Expected r.m.s in y direction
1338 Float_t ycrosscor = GetPadLength() * GetTilt() * 0.5; // Y correction for crossing
1349 // Buffering: Leave it constant fot Performance issues
1350 Int_t zints[kNtb]; // Histograming of the z coordinate
1351 // Get 1 and second max probable coodinates in z
1352 Int_t zouts[2*kNtb];
1353 Float_t allowedz[kNtb]; // Allowed z for given time bin
1354 Float_t yres[kNtb]; // Residuals from reference
1355 //Float_t anglecor = GetTilt() * fZref[1]; // Correction to the angle
1357 Float_t pos[3*kNtb]; memset(pos, 0, 3*kNtb*sizeof(Float_t));
1358 Float_t *fX = &pos[0], *fY = &pos[kNtb], *fZ = &pos[2*kNtb];
1360 Int_t fN = 0; AliTRDcluster *c = 0x0;
1362 for (Int_t i = 0; i < AliTRDtrackerV1::GetNTimeBins(); i++) {
1364 if (!(c = fClusters[i])) continue;
1365 if(!c->IsInChamber()) continue;
1367 //yres[i] = fY[i] - fYref[0] - (fYref[1] + anglecor) * fX[i] + GetTilt()*(fZ[i] - fZref[0]);
1368 fX[i] = fX0 - c->GetX();
1371 yres[i] = fY[i] - GetTilt()*(fZ[i] - (fZref[0] - fX[i]*fZref[1]));
1372 zints[fN] = Int_t(fZ[i]);
1377 //printf("Exit fN < kClmin: fN = %d\n", fN);
1380 Int_t nz = AliTRDtrackerV1::Freq(fN, zints, zouts, kFALSE);
1381 Float_t fZProb = zouts[0];
1382 if (nz <= 1) zouts[3] = 0;
1383 if (zouts[1] + zouts[3] < kClmin) {
1384 //printf("Exit zouts[1] = %d, zouts[3] = %d\n",zouts[1],zouts[3]);
1388 // Z distance bigger than pad - length
1389 if (TMath::Abs(zouts[0]-zouts[2]) > 12.0) zouts[3] = 0;
1391 Int_t breaktime = -1;
1392 Bool_t mbefore = kFALSE;
1393 Int_t cumul[kNtb][2];
1394 Int_t counts[2] = { 0, 0 };
1396 if (zouts[3] >= 3) {
1399 // Find the break time allowing one chage on pad-rows
1400 // with maximal number of accepted clusters
1403 for (Int_t i = 0; i < AliTRDtrackerV1::GetNTimeBins(); i++) {
1404 cumul[i][0] = counts[0];
1405 cumul[i][1] = counts[1];
1406 if (TMath::Abs(fZ[i]-zouts[0]) < 2) counts[0]++;
1407 if (TMath::Abs(fZ[i]-zouts[2]) < 2) counts[1]++;
1410 for (Int_t i = 0; i < AliTRDtrackerV1::GetNTimeBins(); i++) {
1411 Int_t after = cumul[AliTRDtrackerV1::GetNTimeBins()][0] - cumul[i][0];
1412 Int_t before = cumul[i][1];
1413 if (after + before > maxcount) {
1414 maxcount = after + before;
1418 after = cumul[AliTRDtrackerV1::GetNTimeBins()-1][1] - cumul[i][1];
1419 before = cumul[i][0];
1420 if (after + before > maxcount) {
1421 maxcount = after + before;
1429 for (Int_t i = 0; i < AliTRDtrackerV1::GetNTimeBins()+1; i++) {
1430 if (i > breaktime) allowedz[i] = mbefore ? zouts[2] : zouts[0];
1431 if (i <= breaktime) allowedz[i] = (!mbefore) ? zouts[2] : zouts[0];
1434 if (((allowedz[0] > allowedz[AliTRDtrackerV1::GetNTimeBins()]) && (fZref[1] < 0)) ||
1435 ((allowedz[0] < allowedz[AliTRDtrackerV1::GetNTimeBins()]) && (fZref[1] > 0))) {
1437 // Tracklet z-direction not in correspondance with track z direction
1440 for (Int_t i = 0; i < AliTRDtrackerV1::GetNTimeBins()+1; i++) {
1441 allowedz[i] = zouts[0]; // Only longest taken
1447 // Cross pad -row tracklet - take the step change into account
1449 for (Int_t i = 0; i < AliTRDtrackerV1::GetNTimeBins()+1; i++) {
1450 if (!fClusters[i]) continue;
1451 if(!fClusters[i]->IsInChamber()) continue;
1452 if (TMath::Abs(fZ[i] - allowedz[i]) > 2) continue;
1454 //yres[i] = fY[i] - fYref[0] - (fYref[1] + anglecor) * fX[i] + GetTilt()*(fZ[i] - fZref[0]);
1455 yres[i] = fY[i] - GetTilt()*(fZ[i] - (fZref[0] - fX[i]*fZref[1]));
1456 // if (TMath::Abs(fZ[i] - fZProb) > 2) {
1457 // if (fZ[i] > fZProb) yres[i] += GetTilt() * GetPadLength();
1458 // if (fZ[i] < fZProb) yres[i] -= GetTilt() * GetPadLength();
1463 Double_t yres2[kNtb];
1466 for (Int_t i = 0; i < AliTRDtrackerV1::GetNTimeBins()+1; i++) {
1467 if (!fClusters[i]) continue;
1468 if(!fClusters[i]->IsInChamber()) continue;
1469 if (TMath::Abs(fZ[i] - allowedz[i]) > 2) continue;
1470 yres2[fN2] = yres[i];
1474 //printf("Exit fN2 < kClmin: fN2 = %d\n", fN2);
1478 AliMathBase::EvaluateUni(fN2,yres2,mean,sigma, Int_t(fN2*kRatio-2.));
1479 if (sigma < sigmaexp * 0.8) {
1482 //Float_t fSigmaY = sigma;
1497 for (Int_t i = 0; i < AliTRDtrackerV1::GetNTimeBins()+1; i++) {
1498 if (!fClusters[i]) continue;
1499 if (!fClusters[i]->IsInChamber()) continue;
1500 if (TMath::Abs(fZ[i] - allowedz[i]) > 2){fClusters[i] = 0x0; continue;}
1501 if (TMath::Abs(yres[i] - mean) > 4.0 * sigma){fClusters[i] = 0x0; continue;}
1504 fMPads += fClusters[i]->GetNPads();
1505 Float_t weight = 1.0;
1506 if (fClusters[i]->GetNPads() > 4) weight = 0.5;
1507 if (fClusters[i]->GetNPads() > 5) weight = 0.2;
1511 //printf("x = %7.3f dy = %7.3f fit %7.3f\n", x, yres[i], fY[i]-yres[i]);
1514 sumwx += x * weight;
1515 sumwx2 += x*x * weight;
1516 sumwy += weight * yres[i];
1517 sumwxy += weight * (yres[i]) * x;
1518 sumwz += weight * fZ[i];
1519 sumwxz += weight * fZ[i] * x;
1524 //printf("Exit fN2 < kClmin(2): fN2 = %d\n",fN2);
1528 fMeanz = sumwz / sumw;
1529 Float_t correction = 0;
1531 // Tracklet on boundary
1532 if (fMeanz < fZProb) correction = ycrosscor;
1533 if (fMeanz > fZProb) correction = -ycrosscor;
1536 Double_t det = sumw * sumwx2 - sumwx * sumwx;
1537 fYfit[0] = (sumwx2 * sumwy - sumwx * sumwxy) / det;
1538 fYfit[1] = (sumw * sumwxy - sumwx * sumwy) / det;
1541 for (Int_t i = 0; i < AliTRDtrackerV1::GetNTimeBins()+1; i++) {
1542 if (!TESTBIT(fUsable,i)) continue;
1543 Float_t delta = yres[i] - fYfit[0] - fYfit[1] * fX[i];
1544 fS2Y += delta*delta;
1546 fS2Y = TMath::Sqrt(fS2Y / Float_t(fN2-2));
1547 // TEMPORARY UNTIL covariance properly calculated
1548 fS2Y = TMath::Max(fS2Y, Float_t(.1));
1550 fZfit[0] = (sumwx2 * sumwz - sumwx * sumwxz) / det;
1551 fZfit[1] = (sumw * sumwxz - sumwx * sumwz) / det;
1552 // fYfitR[0] += fYref[0] + correction;
1553 // fYfitR[1] += fYref[1];
1554 // fYfit[0] = fYfitR[0];
1555 fYfit[1] = -fYfit[1];
1560 //___________________________________________________________________
1561 void AliTRDseedV1::Print(Option_t *o) const
1564 // Printing the seedstatus
1567 AliInfo(Form("Det[%3d] Pad[L[%5.2f] W[%5.2f] Tilt[%+6.2f]]", fDet, GetPadLength(), GetPadWidth(), GetTilt()));
1568 AliInfo(Form("N[%2d] Nused[%2d] Nshared[%2d] [%d]", GetN(), GetNUsed(), GetNShared(), fN));
1570 Double_t cov[3], x=GetX();
1572 AliInfo(" | x[cm] | y[cm] | z[cm] | dydx | dzdx |");
1573 AliInfo(Form("Fit | %7.2f | %7.2f+-%7.2f | %7.2f+-%7.2f| %5.2f | ----- |", x, GetY(), TMath::Sqrt(cov[0]), GetZ(), TMath::Sqrt(cov[2]), fYfit[1]));
1574 AliInfo(Form("Ref | %7.2f | %7.2f+-%7.2f | %7.2f+-%7.2f| %5.2f | %5.2f |", x, fYref[0]-fX*fYref[1], TMath::Sqrt(fRefCov[2]), fZref[0]-fX*fYref[1], TMath::Sqrt(fRefCov[2]), fYref[1], fZref[1]))
1577 if(strcmp(o, "a")!=0) return;
1579 AliTRDcluster* const* jc = &fClusters[0];
1580 for(int ic=0; ic<kNclusters; ic++, jc++) {
1581 if(!(*jc)) continue;
1587 //___________________________________________________________________
1588 Bool_t AliTRDseedV1::IsEqual(const TObject *o) const
1590 // Checks if current instance of the class has the same essential members
1593 if(!o) return kFALSE;
1594 const AliTRDseedV1 *inTracklet = dynamic_cast<const AliTRDseedV1*>(o);
1595 if(!inTracklet) return kFALSE;
1597 for (Int_t i = 0; i < 2; i++){
1598 if ( fYref[i] != inTracklet->fYref[i] ) return kFALSE;
1599 if ( fZref[i] != inTracklet->fZref[i] ) return kFALSE;
1602 if ( fS2Y != inTracklet->fS2Y ) return kFALSE;
1603 if ( GetTilt() != inTracklet->GetTilt() ) return kFALSE;
1604 if ( GetPadLength() != inTracklet->GetPadLength() ) return kFALSE;
1606 for (Int_t i = 0; i < kNclusters; i++){
1607 // if ( fX[i] != inTracklet->GetX(i) ) return kFALSE;
1608 // if ( fY[i] != inTracklet->GetY(i) ) return kFALSE;
1609 // if ( fZ[i] != inTracklet->GetZ(i) ) return kFALSE;
1610 if ( fIndexes[i] != inTracklet->fIndexes[i] ) return kFALSE;
1612 // if ( fUsable != inTracklet->fUsable ) return kFALSE;
1614 for (Int_t i=0; i < 2; i++){
1615 if ( fYfit[i] != inTracklet->fYfit[i] ) return kFALSE;
1616 if ( fZfit[i] != inTracklet->fZfit[i] ) return kFALSE;
1617 if ( fLabels[i] != inTracklet->fLabels[i] ) return kFALSE;
1620 /* if ( fMeanz != inTracklet->GetMeanz() ) return kFALSE;
1621 if ( fZProb != inTracklet->GetZProb() ) return kFALSE;*/
1622 if ( fN != inTracklet->fN ) return kFALSE;
1623 //if ( fNUsed != inTracklet->fNUsed ) return kFALSE;
1624 //if ( fFreq != inTracklet->GetFreq() ) return kFALSE;
1625 //if ( fNChange != inTracklet->GetNChange() ) return kFALSE;
1627 if ( fC != inTracklet->fC ) return kFALSE;
1628 //if ( fCC != inTracklet->GetCC() ) return kFALSE;
1629 if ( fChi2 != inTracklet->fChi2 ) return kFALSE;
1630 // if ( fChi2Z != inTracklet->GetChi2Z() ) return kFALSE;
1632 if ( fDet != inTracklet->fDet ) return kFALSE;
1633 if ( fMom != inTracklet->fMom ) return kFALSE;
1634 if ( fdX != inTracklet->fdX ) return kFALSE;
1636 for (Int_t iCluster = 0; iCluster < kNclusters; iCluster++){
1637 AliTRDcluster *curCluster = fClusters[iCluster];
1638 AliTRDcluster *inCluster = inTracklet->fClusters[iCluster];
1639 if (curCluster && inCluster){
1640 if (! curCluster->IsEqual(inCluster) ) {
1641 curCluster->Print();
1646 // if one cluster exists, and corresponding
1647 // in other tracklet doesn't - return kFALSE
1648 if(curCluster || inCluster) return kFALSE;