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. *
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14 **************************************************************************/
18 ////////////////////////////////////////////////////////////////////////////
20 // The TRD track seed //
23 // Alex Bercuci <A.Bercuci@gsi.de> //
24 // Markus Fasel <M.Fasel@gsi.de> //
26 ////////////////////////////////////////////////////////////////////////////
29 #include "TLinearFitter.h"
30 #include "TClonesArray.h" // tmp
31 #include <TTreeStream.h>
34 #include "AliMathBase.h"
35 #include "AliCDBManager.h"
36 #include "AliTracker.h"
38 #include "AliTRDpadPlane.h"
39 #include "AliTRDcluster.h"
40 #include "AliTRDseedV1.h"
41 #include "AliTRDtrackV1.h"
42 #include "AliTRDcalibDB.h"
43 #include "AliTRDchamberTimeBin.h"
44 #include "AliTRDtrackingChamber.h"
45 #include "AliTRDtrackerV1.h"
46 #include "AliTRDReconstructor.h"
47 #include "AliTRDrecoParam.h"
48 #include "AliTRDCommonParam.h"
50 #include "Cal/AliTRDCalPID.h"
51 #include "Cal/AliTRDCalROC.h"
52 #include "Cal/AliTRDCalDet.h"
54 ClassImp(AliTRDseedV1)
56 //____________________________________________________________________
57 AliTRDseedV1::AliTRDseedV1(Int_t det)
88 for(Int_t ic=kNTimeBins; ic--;) fIndexes[ic] = -1;
89 memset(fClusters, 0, kNTimeBins*sizeof(AliTRDcluster*));
90 fYref[0] = 0.; fYref[1] = 0.;
91 fZref[0] = 0.; fZref[1] = 0.;
92 fYfit[0] = 0.; fYfit[1] = 0.;
93 fZfit[0] = 0.; fZfit[1] = 0.;
94 memset(fdEdx, 0, kNSlices*sizeof(Float_t));
95 for(int ispec=0; ispec<AliPID::kSPECIES; ispec++) fProb[ispec] = -1.;
96 fLabels[0]=-1; fLabels[1]=-1; // most freq MC labels
97 fLabels[2]=0; // number of different labels for tracklet
98 fRefCov[0] = 1.; fRefCov[1] = 0.; fRefCov[2] = 1.;
99 // covariance matrix [diagonal]
100 // default sy = 200um and sz = 2.3 cm
101 fCov[0] = 4.e-4; fCov[1] = 0.; fCov[2] = 5.3;
104 //____________________________________________________________________
105 AliTRDseedV1::AliTRDseedV1(const AliTRDseedV1 &ref)
106 :TObject((TObject&)ref)
134 // Copy Constructor performing a deep copy
139 SetBit(kOwner, kFALSE);
143 //____________________________________________________________________
144 AliTRDseedV1& AliTRDseedV1::operator=(const AliTRDseedV1 &ref)
147 // Assignment Operator using the copy function
153 SetBit(kOwner, kFALSE);
158 //____________________________________________________________________
159 AliTRDseedV1::~AliTRDseedV1()
162 // Destructor. The RecoParam object belongs to the underlying tracker.
165 //printf("I-AliTRDseedV1::~AliTRDseedV1() : Owner[%s]\n", IsOwner()?"YES":"NO");
168 for(int itb=0; itb<kNTimeBins; itb++){
169 if(!fClusters[itb]) continue;
170 //AliInfo(Form("deleting c %p @ %d", fClusters[itb], itb));
171 delete fClusters[itb];
172 fClusters[itb] = 0x0;
177 //____________________________________________________________________
178 void AliTRDseedV1::Copy(TObject &ref) const
185 AliTRDseedV1 &target = (AliTRDseedV1 &)ref;
187 target.fReconstructor = fReconstructor;
188 target.fClusterIter = 0x0;
192 target.fS2PRF = fS2PRF;
193 target.fDiffL = fDiffL;
194 target.fDiffT = fDiffT;
195 target.fClusterIdx = 0;
196 target.fUsable = fUsable;
198 target.fNUsed = fNUsed;
200 target.fTilt = fTilt;
201 target.fPadLength = fPadLength;
211 target.fChi2 = fChi2;
213 memcpy(target.fIndexes, fIndexes, kNTimeBins*sizeof(Int_t));
214 memcpy(target.fClusters, fClusters, kNTimeBins*sizeof(AliTRDcluster*));
215 target.fYref[0] = fYref[0]; target.fYref[1] = fYref[1];
216 target.fZref[0] = fZref[0]; target.fZref[1] = fZref[1];
217 target.fYfit[0] = fYfit[0]; target.fYfit[1] = fYfit[1];
218 target.fZfit[0] = fZfit[0]; target.fZfit[1] = fZfit[1];
219 memcpy(target.fdEdx, fdEdx, kNSlices*sizeof(Float_t));
220 memcpy(target.fProb, fProb, AliPID::kSPECIES*sizeof(Float_t));
221 memcpy(target.fLabels, fLabels, 3*sizeof(Int_t));
222 memcpy(target.fRefCov, fRefCov, 3*sizeof(Double_t));
223 memcpy(target.fCov, fCov, 3*sizeof(Double_t));
229 //____________________________________________________________
230 Bool_t AliTRDseedV1::Init(AliTRDtrackV1 *track)
232 // Initialize this tracklet using the track information
235 // track - the TRD track used to initialize the tracklet
237 // Detailed description
238 // The function sets the starting point and direction of the
239 // tracklet according to the information from the TRD track.
242 // The TRD track has to be propagated to the beginning of the
243 // chamber where the tracklet will be constructed
247 if(!track->GetProlongation(fX0, y, z)) return kFALSE;
253 //_____________________________________________________________________________
254 void AliTRDseedV1::Reset()
259 fExB=0.;fVD=0.;fT0=0.;fS2PRF=0.;
261 fClusterIdx=0;fUsable=0;
263 fDet=-1;fTilt=0.;fPadLength=0.;
265 fdX=0.;fX0=0.; fX=0.; fY=0.; fZ=0.;
269 for(Int_t ic=kNTimeBins; ic--;) fIndexes[ic] = -1;
270 memset(fClusters, 0, kNTimeBins*sizeof(AliTRDcluster*));
271 fYref[0] = 0.; fYref[1] = 0.;
272 fZref[0] = 0.; fZref[1] = 0.;
273 fYfit[0] = 0.; fYfit[1] = 0.;
274 fZfit[0] = 0.; fZfit[1] = 0.;
275 memset(fdEdx, 0, kNSlices*sizeof(Float_t));
276 for(int ispec=0; ispec<AliPID::kSPECIES; ispec++) fProb[ispec] = -1.;
277 fLabels[0]=-1; fLabels[1]=-1; // most freq MC labels
278 fLabels[2]=0; // number of different labels for tracklet
279 fRefCov[0] = 1.; fRefCov[1] = 0.; fRefCov[2] = 1.;
280 // covariance matrix [diagonal]
281 // default sy = 200um and sz = 2.3 cm
282 fCov[0] = 4.e-4; fCov[1] = 0.; fCov[2] = 5.3;
285 //____________________________________________________________________
286 void AliTRDseedV1::UpDate(const AliTRDtrackV1 *trk)
288 // update tracklet reference position from the TRD track
289 // Funny name to avoid the clash with the function AliTRDseed::Update() (has to be made obselete)
291 Double_t fSnp = trk->GetSnp();
292 Double_t fTgl = trk->GetTgl();
294 fYref[1] = fSnp/(1. - fSnp*fSnp);
296 SetCovRef(trk->GetCovariance());
298 Double_t dx = trk->GetX() - fX0;
299 fYref[0] = trk->GetY() - dx*fYref[1];
300 fZref[0] = trk->GetZ() - dx*fZref[1];
303 //_____________________________________________________________________________
304 void AliTRDseedV1::UpdateUsed()
311 for (Int_t i = kNTimeBins; i--; ) {
312 if (!fClusters[i]) continue;
313 if(!TESTBIT(fUsable, i)) continue;
314 if((fClusters[i]->IsUsed())) fNUsed++;
318 //_____________________________________________________________________________
319 void AliTRDseedV1::UseClusters()
324 AliTRDcluster **c = &fClusters[0];
325 for (Int_t ic=kNTimeBins; ic--; c++) {
327 if(!((*c)->IsUsed())) (*c)->Use();
332 //____________________________________________________________________
333 void AliTRDseedV1::CookdEdx(Int_t nslices)
335 // Calculates average dE/dx for all slices and store them in the internal array fdEdx.
338 // nslices : number of slices for which dE/dx should be calculated
340 // store results in the internal array fdEdx. This can be accessed with the method
341 // AliTRDseedV1::GetdEdx()
343 // Detailed description
344 // Calculates average dE/dx for all slices. Depending on the PID methode
345 // the number of slices can be 3 (LQ) or 8(NN).
346 // The calculation of dQ/dl are done using the tracklet fit results (see AliTRDseedV1::GetdQdl(Int_t))
348 // The following effects are included in the calculation:
349 // 1. calibration values for t0 and vdrift (using x coordinate to calculate slice)
350 // 2. cluster sharing (optional see AliTRDrecoParam::SetClusterSharing())
354 Int_t nclusters[kNSlices];
355 memset(nclusters, 0, kNSlices*sizeof(Int_t));
356 memset(fdEdx, 0, kNSlices*sizeof(Float_t));
358 const Double_t kDriftLength = (.5 * AliTRDgeometry::AmThick() + AliTRDgeometry::DrThick());
360 AliTRDcluster *c = 0x0;
361 for(int ic=0; ic<AliTRDtrackerV1::GetNTimeBins(); ic++){
362 if(!(c = fClusters[ic]) && !(c = fClusters[ic+kNtb])) continue;
363 Float_t dx = TMath::Abs(fX0 - c->GetX());
365 // Filter clusters for dE/dx calculation
367 // 1.consider calibration effects for slice determination
369 if(dx<kDriftLength){ // TODO should be replaced by c->IsInChamber()
370 slice = Int_t(dx * nslices / kDriftLength);
371 } else slice = c->GetX() < fX0 ? nslices-1 : 0;
374 // 2. take sharing into account
375 Float_t w = c->IsShared() ? .5 : 1.;
377 // 3. take into account large clusters TODO
378 //w *= c->GetNPads() > 3 ? .8 : 1.;
381 fdEdx[slice] += w * GetdQdl(ic); //fdQdl[ic];
383 } // End of loop over clusters
385 //if(fReconstructor->GetPIDMethod() == AliTRDReconstructor::kLQPID){
386 if(nslices == AliTRDpidUtil::kLQslices){
387 // calculate mean charge per slice (only LQ PID)
388 for(int is=0; is<nslices; is++){
389 if(nclusters[is]) fdEdx[is] /= nclusters[is];
394 //_____________________________________________________________________________
395 void AliTRDseedV1::CookLabels()
398 // Cook 2 labels for seed
404 for (Int_t i = 0; i < kNTimeBins; i++) {
405 if (!fClusters[i]) continue;
406 for (Int_t ilab = 0; ilab < 3; ilab++) {
407 if (fClusters[i]->GetLabel(ilab) >= 0) {
408 labels[nlab] = fClusters[i]->GetLabel(ilab);
414 fLabels[2] = AliTRDtrackerV1::Freq(nlab,labels,out,kTRUE);
416 if ((fLabels[2] > 1) && (out[3] > 1)) fLabels[1] = out[2];
420 //____________________________________________________________________
421 void AliTRDseedV1::GetClusterXY(const AliTRDcluster *c, Double_t &x, Double_t &y)
423 // Return corrected position of the cluster taking into
424 // account variation of the drift velocity with drift length.
427 // drift velocity correction TODO to be moved to the clusterizer
428 const Float_t cx[] = {
429 -9.6280e-02, 1.3091e-01,-1.7415e-02,-9.9221e-02,-1.2040e-01,-9.5493e-02,
430 -5.0041e-02,-1.6726e-02, 3.5756e-03, 1.8611e-02, 2.6378e-02, 3.3823e-02,
431 3.4811e-02, 3.5282e-02, 3.5386e-02, 3.6047e-02, 3.5201e-02, 3.4384e-02,
432 3.2864e-02, 3.1932e-02, 3.2051e-02, 2.2539e-02,-2.5154e-02,-1.2050e-01,
436 // PRF correction TODO to be replaced by the gaussian
437 // approximation with full error parametrization and // moved to the clusterizer
438 const Float_t cy[AliTRDgeometry::kNlayer][3] = {
439 { 4.014e-04, 8.605e-03, -6.880e+00},
440 {-3.061e-04, 9.663e-03, -6.789e+00},
441 { 1.124e-03, 1.105e-02, -6.825e+00},
442 {-1.527e-03, 1.231e-02, -6.777e+00},
443 { 2.150e-03, 1.387e-02, -6.783e+00},
444 {-1.296e-03, 1.486e-02, -6.825e+00}
447 Int_t ily = AliTRDgeometry::GetLayer(c->GetDetector());
448 x = c->GetX() - cx[c->GetLocalTimeBin()];
449 y = c->GetY() + cy[ily][0] + cy[ily][1] * TMath::Sin(cy[ily][2] * c->GetCenter());
453 //____________________________________________________________________
454 Float_t AliTRDseedV1::GetdQdl(Int_t ic) const
456 // Using the linear approximation of the track inside one TRD chamber (TRD tracklet)
457 // the charge per unit length can be written as:
459 // #frac{dq}{dl} = #frac{q_{c}}{dx * #sqrt{1 + #(){#frac{dy}{dx}}^{2}_{fit} + #(){#frac{dy}{dx}}^{2}_{ref}}}
461 // where qc is the total charge collected in the current time bin and dx is the length
462 // of the time bin. For the moment (Jan 20 2009) only pad row cross corrections are
463 // considered for the charge but none are applied for drift velocity variations along
464 // the drift region or assymetry of the TRF
466 // Author : Alex Bercuci <A.Bercuci@gsi.de>
469 if(fClusters[ic]) dq += TMath::Abs(fClusters[ic]->GetQ());
470 if(fClusters[ic+kNtb]) dq += TMath::Abs(fClusters[ic+kNtb]->GetQ());
471 if(dq<1.e-3 || fdX < 1.e-3) return 0.;
473 return dq/fdX/TMath::Sqrt(1. + fYfit[1]*fYfit[1] + fZref[1]*fZref[1]);
476 //____________________________________________________________________
477 Float_t* AliTRDseedV1::GetProbability()
479 // Fill probability array for tracklet from the DB.
484 // returns pointer to the probability array and 0x0 if missing DB access
486 // Detailed description
489 // retrive calibration db
490 AliTRDcalibDB *calibration = AliTRDcalibDB::Instance();
492 AliError("No access to calibration data");
496 if (!fReconstructor) {
497 AliError("Reconstructor not set.");
501 // Retrieve the CDB container class with the parametric detector response
502 const AliTRDCalPID *pd = calibration->GetPIDObject(fReconstructor->GetPIDMethod());
504 AliError("No access to AliTRDCalPID object");
507 //AliInfo(Form("Method[%d] : %s", fReconstructor->GetRecoParam() ->GetPIDMethod(), pd->IsA()->GetName()));
509 // calculate tracklet length TO DO
510 Float_t length = (AliTRDgeometry::AmThick() + AliTRDgeometry::DrThick());
511 /// TMath::Sqrt((1.0 - fSnp[iPlane]*fSnp[iPlane]) / (1.0 + fTgl[iPlane]*fTgl[iPlane]));
514 CookdEdx(fReconstructor->GetNdEdxSlices());
516 // Sets the a priori probabilities
517 for(int ispec=0; ispec<AliPID::kSPECIES; ispec++) {
518 fProb[ispec] = pd->GetProbability(ispec, fMom, &fdEdx[0], length, GetPlane());
524 //____________________________________________________________________
525 Float_t AliTRDseedV1::GetQuality(Bool_t kZcorr) const
528 // Returns a quality measurement of the current seed
531 Float_t zcorr = kZcorr ? fTilt * (fZfit[0] - fZref[0]) : 0.;
533 .5 * TMath::Abs(18.0 - fN2)
534 + 10.* TMath::Abs(fYfit[1] - fYref[1])
535 + 5. * TMath::Abs(fYfit[0] - fYref[0] + zcorr)
536 + 2. * TMath::Abs(fZfit[0] - fZref[0]) / fPadLength;
539 //____________________________________________________________________
540 void AliTRDseedV1::GetCovAt(Double_t x, Double_t *cov) const
542 // Computes covariance in the y-z plane at radial point x (in tracking coordinates)
543 // and returns the results in the preallocated array cov[3] as :
550 // For the linear transformation
554 // The error propagation has the general form
556 // C_{Y} = T_{x} C_{X} T_{x}^{T}
558 // We apply this formula 2 times. First to calculate the covariance of the tracklet
559 // at point x we consider:
561 // T_{x} = (1 x); X=(y0 dy/dx); C_{X}=#(){#splitline{Var(y0) Cov(y0, dy/dx)}{Cov(y0, dy/dx) Var(dy/dx)}}
563 // and secondly to take into account the tilt angle
565 // T_{#alpha} = #(){#splitline{cos(#alpha) __ sin(#alpha)}{-sin(#alpha) __ cos(#alpha)}}; X=(y z); C_{X}=#(){#splitline{Var(y) 0}{0 Var(z)}}
568 // using simple trigonometrics one can write for this last case
570 // 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})}}
572 // which can be aproximated for small alphas (2 deg) with
574 // 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}}}
577 // before applying the tilt rotation we also apply systematic uncertainties to the tracklet
578 // position which can be tunned from outside via the AliTRDrecoParam::SetSysCovMatrix(). They might
579 // account for extra misalignment/miscalibration uncertainties.
582 // Alex Bercuci <A.Bercuci@gsi.de>
583 // Date : Jan 8th 2009
588 Double_t sy2 = fCov[0] +2.*xr*fCov[1] + xr*xr*fCov[2];
589 Double_t sz2 = fPadLength*fPadLength/12.;
591 // insert systematic uncertainties
593 fReconstructor->GetRecoParam()->GetSysCovMatrix(sys);
597 // rotate covariance matrix
598 Double_t t2 = fTilt*fTilt;
599 Double_t correction = 1./(1. + t2);
600 cov[0] = (sy2+t2*sz2)*correction;
601 cov[1] = fTilt*(sz2 - sy2)*correction;
602 cov[2] = (t2*sy2+sz2)*correction;
606 //____________________________________________________________________
607 void AliTRDseedV1::Calibrate()
609 // Retrieve calibration and position parameters from OCDB.
610 // The following information are used
612 // - column and row position of first attached cluster. If no clusters are attached
613 // to the tracklet a random central chamber position (c=70, r=7) will be used.
615 // The following information is cached in the tracklet
616 // t0 (trigger delay)
619 // omega*tau = tg(a_L)
620 // diffusion coefficients (longitudinal and transversal)
623 // Alex Bercuci <A.Bercuci@gsi.de>
624 // Date : Jan 8th 2009
627 AliCDBManager *cdb = AliCDBManager::Instance();
628 if(cdb->GetRun() < 0){
629 AliError("OCDB manager not properly initialized");
633 AliTRDcalibDB *calib = AliTRDcalibDB::Instance();
634 AliTRDCalROC *vdROC = calib->GetVdriftROC(fDet),
635 *t0ROC = calib->GetT0ROC(fDet);;
636 const AliTRDCalDet *vdDet = calib->GetVdriftDet();
637 const AliTRDCalDet *t0Det = calib->GetT0Det();
639 Int_t col = 70, row = 7;
640 AliTRDcluster **c = &fClusters[0];
643 while (ic<kNTimeBins && !(*c)){ic++; c++;}
645 col = (*c)->GetPadCol();
646 row = (*c)->GetPadRow();
650 fT0 = t0Det->GetValue(fDet) + t0ROC->GetValue(col,row);
651 fVD = vdDet->GetValue(fDet) * vdROC->GetValue(col, row);
652 fS2PRF = calib->GetPRFWidth(fDet, col, row); fS2PRF *= fS2PRF;
653 fExB = AliTRDCommonParam::Instance()->GetOmegaTau(fVD);
654 AliTRDCommonParam::Instance()->GetDiffCoeff(fDiffL,
656 SetBit(kCalib, kTRUE);
659 //____________________________________________________________________
660 void AliTRDseedV1::SetOwner()
662 //AliInfo(Form("own [%s] fOwner[%s]", own?"YES":"NO", fOwner?"YES":"NO"));
664 if(TestBit(kOwner)) return;
665 for(int ic=0; ic<kNTimeBins; ic++){
666 if(!fClusters[ic]) continue;
667 fClusters[ic] = new AliTRDcluster(*fClusters[ic]);
672 //____________________________________________________________________
673 Bool_t AliTRDseedV1::AttachClustersIter(AliTRDtrackingChamber *chamber, Float_t quality, Bool_t kZcorr, AliTRDcluster *c)
676 // Iterative process to register clusters to the seed.
677 // In iteration 0 we try only one pad-row and if quality not
678 // sufficient we try 2 pad-rows (about 5% of tracks cross 2 pad-rows)
683 if(!fReconstructor->GetRecoParam() ){
684 AliError("Seed can not be used without a valid RecoParam.");
688 AliTRDchamberTimeBin *layer = 0x0;
689 if(fReconstructor->GetStreamLevel(AliTRDReconstructor::kTracker)>=7){
690 AliTRDtrackingChamber ch(*chamber);
692 TTreeSRedirector &cstreamer = *fReconstructor->GetDebugStream(AliTRDReconstructor::kTracker);
693 cstreamer << "AttachClustersIter"
694 << "chamber.=" << &ch
695 << "tracklet.=" << this
700 Double_t kroady = fReconstructor->GetRecoParam() ->GetRoad1y();
701 Double_t kroadz = fPadLength * .5 + 1.;
703 // initialize configuration parameters
704 Float_t zcorr = kZcorr ? fTilt * (fZfit[0] - fZref[0]) : 0.;
705 Int_t niter = kZcorr ? 1 : 2;
710 for (Int_t iter = 0; iter < niter; iter++) {
712 for (Int_t iTime = 0; iTime < AliTRDtrackerV1::GetNTimeBins(); iTime++) {
713 if(!(layer = chamber->GetTB(iTime))) continue;
714 if(!Int_t(*layer)) continue;
716 // define searching configuration
717 Double_t dxlayer = layer->GetX() - fX0;
720 //Try 2 pad-rows in second iteration
722 zexp = fZref[0] + fZref[1] * dxlayer - zcorr;
723 if (zexp > c->GetZ()) zexp = c->GetZ() + fPadLength*0.5;
724 if (zexp < c->GetZ()) zexp = c->GetZ() - fPadLength*0.5;
726 } else zexp = fZref[0] + (kZcorr ? fZref[1] * dxlayer : 0.);
727 yexp = fYref[0] + fYref[1] * dxlayer - zcorr;
729 // Get and register cluster
730 Int_t index = layer->SearchNearestCluster(yexp, zexp, kroady, kroadz);
731 if (index < 0) continue;
732 AliTRDcluster *cl = (*layer)[index];
734 fIndexes[iTime] = layer->GetGlobalIndex(index);
735 fClusters[iTime] = cl;
736 // fY[iTime] = cl->GetY();
737 // fZ[iTime] = cl->GetZ();
740 if(fReconstructor->GetStreamLevel(AliTRDReconstructor::kTracker)>=7) AliInfo(Form("iter = %d ncl [%d] = %d", iter, fDet, ncl));
743 // calculate length of the time bin (calibration aware)
744 Int_t irp = 0; Float_t x[2]={0., 0.}; Int_t tb[2] = {0,0};
745 for (Int_t iTime = 0; iTime < AliTRDtrackerV1::GetNTimeBins(); iTime++) {
746 if(!fClusters[iTime]) continue;
747 x[irp] = fClusters[iTime]->GetX();
752 Int_t dtb = tb[1] - tb[0];
753 fdX = dtb ? (x[0] - x[1]) / dtb : 0.15;
755 // update X0 from the clusters (calibration/alignment aware)
756 for (Int_t iTime = 0; iTime < AliTRDtrackerV1::GetNTimeBins(); iTime++) {
757 if(!(layer = chamber->GetTB(iTime))) continue;
758 if(!layer->IsT0()) continue;
759 if(fClusters[iTime]){
760 fX0 = fClusters[iTime]->GetX();
762 } else { // we have to infere the position of the anode wire from the other clusters
763 for (Int_t jTime = iTime+1; jTime < AliTRDtrackerV1::GetNTimeBins(); jTime++) {
764 if(!fClusters[jTime]) continue;
765 fX0 = fClusters[jTime]->GetX() + fdX * (jTime - iTime);
771 // update YZ reference point
774 // update x reference positions (calibration/alignment aware)
775 // for (Int_t iTime = 0; iTime < AliTRDtrackerV1::GetNTimeBins(); iTime++) {
776 // if(!fClusters[iTime]) continue;
777 // fX[iTime] = fX0 - fClusters[iTime]->GetX();
782 if(fReconstructor->GetStreamLevel(AliTRDReconstructor::kTracker)>=7) AliInfo(Form("iter = %d nclFit [%d] = %d", iter, fDet, fN2));
785 tquality = GetQuality(kZcorr);
786 if(tquality < quality) break;
787 else quality = tquality;
791 if (!IsOK()) return kFALSE;
793 if(fReconstructor->GetStreamLevel(AliTRDReconstructor::kTracker)>=1) CookLabels();
795 // load calibration params
801 //____________________________________________________________________
802 Bool_t AliTRDseedV1::AttachClusters(AliTRDtrackingChamber *chamber, Bool_t tilt)
805 // Projective algorithm to attach clusters to seeding tracklets
811 // Detailed description
812 // 1. Collapse x coordinate for the full detector plane
813 // 2. truncated mean on y (r-phi) direction
815 // 4. truncated mean on z direction
819 Bool_t kPRINT = kFALSE;
820 if(!fReconstructor->GetRecoParam() ){
821 AliError("Seed can not be used without a valid RecoParam.");
824 // Initialize reco params for this tracklet
825 // 1. first time bin in the drift region
827 Int_t kClmin = Int_t(fReconstructor->GetRecoParam() ->GetFindableClusters()*AliTRDtrackerV1::GetNTimeBins());
829 Double_t syRef = TMath::Sqrt(fRefCov[0]);
831 Double_t kroady = 1.;
832 //fReconstructor->GetRecoParam() ->GetRoad1y();
833 Double_t kroadz = fPadLength * 1.5 + 1.;
834 if(kPRINT) printf("AttachClusters() sy[%f] road[%f]\n", syRef, kroady);
837 const Int_t kNrows = 16;
838 AliTRDcluster *clst[kNrows][kNTimeBins];
839 Double_t cond[4], dx, dy, yt, zt,
840 yres[kNrows][kNTimeBins];
841 Int_t idxs[kNrows][kNTimeBins], ncl[kNrows], ncls = 0;
842 memset(ncl, 0, kNrows*sizeof(Int_t));
843 memset(clst, 0, kNrows*kNTimeBins*sizeof(AliTRDcluster*));
845 // Do cluster projection
846 AliTRDcluster *c = 0x0;
847 AliTRDchamberTimeBin *layer = 0x0;
848 Bool_t kBUFFER = kFALSE;
849 for (Int_t it = 0; it < AliTRDtrackerV1::GetNTimeBins(); it++) {
850 if(!(layer = chamber->GetTB(it))) continue;
851 if(!Int_t(*layer)) continue;
853 dx = fX0 - layer->GetX();
854 yt = fYref[0] - fYref[1] * dx;
855 zt = fZref[0] - fZref[1] * dx;
856 if(kPRINT) printf("\t%2d dx[%f] yt[%f] zt[%f]\n", it, dx, yt, zt);
858 // select clusters on a 5 sigmaKalman level
859 cond[0] = yt; cond[2] = kroady;
860 cond[1] = zt; cond[3] = kroadz;
862 layer->GetClusters(cond, idx, n, 6);
863 for(Int_t ic = n; ic--;){
864 c = (*layer)[idx[ic]];
866 dy += tilt ? fTilt * (c->GetZ() - zt) : 0.;
867 // select clusters on a 3 sigmaKalman level
868 /* if(tilt && TMath::Abs(dy) > 3.*syRef){
869 printf("too large !!!\n");
872 Int_t r = c->GetPadRow();
873 if(kPRINT) printf("\t\t%d dy[%f] yc[%f] r[%d]\n", ic, TMath::Abs(dy), c->GetY(), r);
875 idxs[r][ncl[r]] = idx[ic];
876 yres[r][ncl[r]] = dy;
879 if(ncl[r] >= kNTimeBins) {
880 AliWarning(Form("Cluster candidates reached limit %d. Some may be lost.", kNTimeBins));
887 if(kPRINT) printf("Found %d clusters\n", ncls);
888 if(ncls<kClmin) return kFALSE;
890 // analyze each row individualy
891 Double_t mean, syDis;
892 Int_t nrow[] = {0, 0, 0}, nr = 0, lr=-1;
893 for(Int_t ir=kNrows; ir--;){
894 if(!(ncl[ir])) continue;
895 if(lr>0 && lr-ir != 1){
896 if(kPRINT) printf("W - gap in rows attached !!\n");
898 if(kPRINT) printf("\tir[%d] lr[%d] n[%d]\n", ir, lr, ncl[ir]);
899 // Evaluate truncated mean on the y direction
900 if(ncl[ir] > 3) AliMathBase::EvaluateUni(ncl[ir], yres[ir], mean, syDis, Int_t(ncl[ir]*.8));
902 mean = 0.; syDis = 0.;
905 // TODO check mean and sigma agains cluster resolution !!
906 if(kPRINT) printf("\tr[%2d] m[%f %5.3fsigma] s[%f]\n", ir, mean, TMath::Abs(mean/syRef), syDis);
907 // select clusters on a 3 sigmaDistr level
908 Bool_t kFOUND = kFALSE;
909 for(Int_t ic = ncl[ir]; ic--;){
910 if(yres[ir][ic] - mean > 3. * syDis){
911 clst[ir][ic] = 0x0; continue;
913 nrow[nr]++; kFOUND = kTRUE;
917 lr = ir; if(nr>=3) break;
919 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]);
921 // classify cluster rows
928 SetBit(kRowCross, kTRUE); // mark pad row crossing
929 if(nrow[0] > nrow[1]){ row = lr+1; lr = -1;}
938 SetBit(kRowCross, kTRUE); // mark pad row crossing
941 if(kPRINT) printf("\trow[%d] n[%d]\n\n", row, nrow[0]);
942 if(row<0) return kFALSE;
944 // Select and store clusters
945 // We should consider here :
946 // 1. How far is the chamber boundary
947 // 2. How big is the mean
949 for (Int_t ir = 0; ir < nr; ir++) {
950 Int_t jr = row + ir*lr;
951 if(kPRINT) printf("\tattach %d clusters for row %d\n", ncl[jr], jr);
952 for (Int_t ic = 0; ic < ncl[jr]; ic++) {
953 if(!(c = clst[jr][ic])) continue;
954 Int_t it = c->GetPadTime();
955 // TODO proper indexing of clusters !!
956 fIndexes[it+kNtb*ir] = chamber->GetTB(it)->GetGlobalIndex(idxs[jr][ic]);
957 fClusters[it+kNtb*ir] = c;
959 //printf("\tid[%2d] it[%d] idx[%d]\n", ic, it, fIndexes[it]);
965 // number of minimum numbers of clusters expected for the tracklet
967 AliWarning(Form("Not enough clusters to fit the tracklet %d [%d].", fN2, kClmin));
972 // update used clusters and select
974 for (Int_t it = 0; it < AliTRDtrackerV1::GetNTimeBins(); it++) {
975 if(fClusters[it] && fClusters[it]->IsUsed()) fNUsed++;
976 if(fClusters[it+kNtb] && fClusters[it+kNtb]->IsUsed()) fNUsed++;
978 if (fN2-fNUsed < kClmin){
979 //AliWarning(Form("Too many clusters already in use %d (from %d).", fNUsed, fN2));
984 // Load calibration parameters for this tracklet
987 // calculate dx for time bins in the drift region (calibration aware)
988 Int_t irp = 0; Float_t x[2] = {0.,0.}; Int_t tb[2]={0,0};
989 for (Int_t it = t0; it < AliTRDtrackerV1::GetNTimeBins(); it++) {
990 if(!fClusters[it]) continue;
991 x[irp] = fClusters[it]->GetX();
996 Int_t dtb = tb[1] - tb[0];
997 fdX = dtb ? (x[0] - x[1]) / dtb : 0.15;
999 // update X0 from the clusters (calibration/alignment aware) TODO remove dependence on x0 !!
1000 for (Int_t it = 0; it < AliTRDtrackerV1::GetNTimeBins(); it++) {
1001 if(!(layer = chamber->GetTB(it))) continue;
1002 if(!layer->IsT0()) continue;
1004 fX0 = fClusters[it]->GetX();
1006 } else { // we have to infere the position of the anode wire from the other clusters
1007 for (Int_t jt = it+1; jt < AliTRDtrackerV1::GetNTimeBins(); jt++) {
1008 if(!fClusters[jt]) continue;
1009 fX0 = fClusters[jt]->GetX() + fdX * (jt - it);
1018 //____________________________________________________________
1019 void AliTRDseedV1::Bootstrap(const AliTRDReconstructor *rec)
1021 // Fill in all derived information. It has to be called after recovery from file or HLT.
1022 // The primitive data are
1023 // - list of clusters
1024 // - detector (as the detector will be removed from clusters)
1025 // - position of anode wire (fX0) - temporary
1026 // - track reference position and direction
1027 // - momentum of the track
1028 // - time bin length [cm]
1030 // A.Bercuci <A.Bercuci@gsi.de> Oct 30th 2008
1032 fReconstructor = rec;
1034 AliTRDpadPlane *pp = g.GetPadPlane(fDet);
1035 fTilt = TMath::Tan(TMath::DegToRad()*pp->GetTiltingAngle());
1036 fPadLength = pp->GetLengthIPad();
1037 //fSnp = fYref[1]/TMath::Sqrt(1+fYref[1]*fYref[1]);
1039 fN2 = 0;// fMPads = 0.;
1040 AliTRDcluster **cit = &fClusters[0];
1041 for(Int_t ic = kNTimeBins; ic--; cit++){
1044 /* fX[ic] = (*cit)->GetX() - fX0;
1045 fY[ic] = (*cit)->GetY();
1046 fZ[ic] = (*cit)->GetZ();*/
1055 //____________________________________________________________________
1056 Bool_t AliTRDseedV1::Fit(Bool_t tilt, Int_t errors)
1059 // Linear fit of the tracklet
1064 // True if successful
1066 // Detailed description
1067 // 2. Check if tracklet crosses pad row boundary
1068 // 1. Calculate residuals in the y (r-phi) direction
1069 // 3. Do a Least Square Fit to the data
1072 if(!IsCalibrated()){
1073 AliWarning("Tracklet fit failed. Call Calibrate().");
1077 const Int_t kClmin = 8;
1080 // cluster error parametrization parameters
1081 // 1. sy total charge
1082 const Float_t sq0inv = 0.019962; // [1/q0]
1083 const Float_t sqb = 1.0281564; //[cm]
1084 // 2. sy for the PRF
1085 const Float_t scy[AliTRDgeometry::kNlayer][4] = {
1086 {2.827e-02, 9.600e-04, 4.296e-01, 2.271e-02},
1087 {2.952e-02,-2.198e-04, 4.146e-01, 2.339e-02},
1088 {3.090e-02, 1.514e-03, 4.020e-01, 2.402e-02},
1089 {3.260e-02,-2.037e-03, 3.946e-01, 2.509e-02},
1090 {3.439e-02,-3.601e-04, 3.883e-01, 2.623e-02},
1091 {3.510e-02, 2.066e-03, 3.651e-01, 2.588e-02},
1093 // 3. sy parallel to the track
1094 const Float_t sy0 = 2.649e-02; // [cm]
1095 const Float_t sya = -8.864e-04; // [cm]
1096 const Float_t syb = -2.435e-01; // [cm]
1098 // 4. sx parallel to the track
1099 const Float_t sxgc = 5.427e-02;
1100 const Float_t sxgm = 7.783e-01;
1101 const Float_t sxgs = 2.743e-01;
1102 const Float_t sxe0 =-2.065e+00;
1103 const Float_t sxe1 =-2.978e-02;
1105 // 5. sx perpendicular to the track
1106 // const Float_t sxd0 = 1.881e-02;
1107 // const Float_t sxd1 =-4.101e-01;
1108 // const Float_t sxd2 = 1.572e+00;
1110 // get track direction
1111 Double_t y0 = fYref[0];
1112 Double_t dydx = fYref[1];
1113 Double_t z0 = fZref[0];
1114 Double_t dzdx = fZref[1];
1117 const Int_t kNtb = AliTRDtrackerV1::GetNTimeBins();
1118 // calculation of tg^2(phi - a_L) and tg^2(a_L)
1119 Double_t tgg = (dydx-fExB)/(1.+dydx*fExB); tgg *= tgg;
1120 //Double_t exb2= fExB*fExB;
1122 //AliTRDtrackerV1::AliTRDLeastSquare fitterZ;
1123 TLinearFitter fitterY(1, "pol1");
1124 // convertion factor from square to gauss distribution for sigma
1125 //Double_t convert = 1./TMath::Sqrt(12.);
1127 // book cluster information
1128 Double_t qc[kNTimeBins], xc[kNTimeBins], yc[kNTimeBins], zc[kNTimeBins], sy[kNTimeBins];
1130 Int_t ily = AliTRDgeometry::GetLayer(fDet);
1132 AliTRDcluster *c=0x0, **jc = &fClusters[0];
1133 for (Int_t ic=0; ic<kNtb; ic++, ++jc) {
1140 if(!(c = (*jc))) continue;
1141 if(!c->IsInChamber()) continue;
1144 if(c->GetNPads()>4) w = .5;
1145 if(c->GetNPads()>5) w = .2;
1147 //zRow[fN] = c->GetPadRow();
1148 qc[fN] = TMath::Abs(c->GetQ());
1149 // correct cluster position for PRF and v drift
1150 //Int_t jc = TMath::Max(fN-3, 0);
1151 //xc[fN] = c->GetXloc(fT0, fVD, &qc[jc], &xc[jc]/*, z0 - c->GetX()*dzdx*/);
1152 //Double_t s2 = fS2PRF + fDiffL*fDiffL*xc[fN]/(1.+2.*exb2)+tgg*xc[fN]*xc[fN]*exb2/12.;
1153 //yc[fN] = c->GetYloc(s2, fPadLength, xc[fN], fExB);
1155 // uncalibrated cluster correction
1157 Double_t x, y; GetClusterXY(c, x, y);
1162 // extrapolated y value for the track
1163 yt = y0 - xc[fN]*dydx;
1164 // extrapolated z value for the track
1165 zt = z0 - xc[fN]*dzdx;
1167 if(tilt) yc[fN] -= fTilt*(zc[fN] - zt);
1169 // ELABORATE CLUSTER ERROR
1170 // TODO to be moved to AliTRDcluster
1171 // basic y error (|| to track).
1172 sy[fN] = xc[fN] < AliTRDgeometry::CamHght() ? 2. : sy0 + sya*TMath::Exp(1./(xc[fN]+syb));
1173 //printf("cluster[%d]\n\tsy[0] = %5.3e [um]\n", fN, sy[fN]*1.e4);
1174 // y error due to total charge
1175 sy[fN] += sqb*(1./qc[fN] - sq0inv);
1176 //printf("\tsy[1] = %5.3e [um]\n", sy[fN]*1.e4);
1177 // y error due to PRF
1178 sy[fN] += scy[ily][0]*TMath::Gaus(c->GetCenter(), scy[ily][1], scy[ily][2]) - scy[ily][3];
1179 //printf("\tsy[2] = %5.3e [um]\n", sy[fN]*1.e4);
1184 // error of drift length parallel to the track
1185 Double_t sx = sxgc*TMath::Gaus(xc[fN], sxgm, sxgs) + TMath::Exp(sxe0+sxe1*xc[fN]); // [cm]
1186 //printf("\tsx[0] = %5.3e [um]\n", sx*1.e4);
1187 // error of drift length perpendicular to the track
1188 //sx += sxd0 + sxd1*d + sxd2*d*d;
1189 sx *= sx; // square sx
1191 // add error from ExB
1192 if(errors>0) sy[fN] += fExB*fExB*sx;
1193 //printf("\tsy[3] = %5.3e [um^2]\n", sy[fN]*1.e8);
1195 // global radial error due to misalignment/miscalibration
1196 Double_t sx0 = 0.; sx0 *= sx0;
1197 // add sx contribution to sy due to track angle
1198 if(errors>1) sy[fN] += tgg*(sx+sx0);
1199 // TODO we should add tilt pad correction here
1200 //printf("\tsy[4] = %5.3e [um^2]\n", sy[fN]*1.e8);
1201 c->SetSigmaY2(sy[fN]);
1203 sy[fN] = TMath::Sqrt(sy[fN]);
1204 fitterY.AddPoint(&xc[fN], yc[fN], sy[fN]);
1208 if (fN < kClmin) return kFALSE;
1212 fYfit[0] = fitterY.GetParameter(0);
1213 fYfit[1] = -fitterY.GetParameter(1);
1215 Double_t *p = fitterY.GetCovarianceMatrix();
1216 fCov[0] = p[0]; // variance of y0
1217 fCov[1] = p[1]; // covariance of y0, dydx
1218 fCov[2] = p[3]; // variance of dydx
1219 // the ref radial position is set at the minimum of
1220 // the y variance of the tracklet
1221 fX = -fCov[1]/fCov[2]; //fXref = fX0 - fXref;
1225 // TODO pad row cross position estimation !!!
1226 //AliInfo(Form("Padrow cross in detector %d", fDet));
1227 fZfit[0] = .5*(zc[0]+zc[fN-1]); fZfit[1] = 0.;
1229 fZfit[0] = zc[0]; fZfit[1] = 0.;
1233 // // determine z offset of the fit
1234 // Float_t zslope = 0.;
1235 // Int_t nchanges = 0, nCross = 0;
1236 // if(nz==2){ // tracklet is crossing pad row
1237 // // Find the break time allowing one chage on pad-rows
1238 // // with maximal number of accepted clusters
1239 // Int_t padRef = zRow[0];
1240 // for (Int_t ic=1; ic<fN; ic++) {
1241 // if(zRow[ic] == padRef) continue;
1244 // if(zRow[ic-1] == zRow[ic]){
1245 // printf("ERROR in pad row change!!!\n");
1248 // // evaluate parameters of the crossing point
1249 // Float_t sx = (xc[ic-1] - xc[ic])*convert;
1250 // fCross[0] = .5 * (xc[ic-1] + xc[ic]);
1251 // fCross[2] = .5 * (zc[ic-1] + zc[ic]);
1252 // fCross[3] = TMath::Max(dzdx * sx, .01);
1253 // zslope = zc[ic-1] > zc[ic] ? 1. : -1.;
1254 // padRef = zRow[ic];
1260 // // condition on nCross and reset nchanges TODO
1263 // if(dzdx * zslope < 0.){
1264 // AliInfo("Tracklet-Track mismatch in dzdx. TODO.");
1268 // //zc[nc] = fitterZ.GetFunctionParameter(0);
1269 // fCross[1] = fYfit[0] - fCross[0] * fYfit[1];
1270 // fCross[0] = fX0 - fCross[0];
1282 //_____________________________________________________________________________
1283 void AliTRDseedV1::FitMI()
1287 // Marian Ivanov's version
1289 // linear fit on the y direction with respect to the reference direction.
1290 // The residuals for each x (x = xc - x0) are deduced from:
1292 // the tilting correction is written :
1293 // y = yc + h*(zc-zt) (2)
1294 // yt = y0+dy/dx*x (3)
1295 // zt = z0+dz/dx*x (4)
1296 // from (1),(2),(3) and (4)
1297 // dy = yc - y0 - (dy/dx + h*dz/dx)*x + h*(zc-z0)
1298 // the last term introduces the correction on y direction due to tilting pads. There are 2 ways to account for this:
1299 // 1. use tilting correction for calculating the y
1300 // 2. neglect tilting correction here and account for it in the error parametrization of the tracklet.
1301 const Float_t kRatio = 0.8;
1302 const Int_t kClmin = 5;
1303 const Float_t kmaxtan = 2;
1305 if (TMath::Abs(fYref[1]) > kmaxtan){
1306 //printf("Exit: Abs(fYref[1]) = %3.3f, kmaxtan = %3.3f\n", TMath::Abs(fYref[1]), kmaxtan);
1307 return; // Track inclined too much
1310 Float_t sigmaexp = 0.05 + TMath::Abs(fYref[1] * 0.25); // Expected r.m.s in y direction
1311 Float_t ycrosscor = fPadLength * fTilt * 0.5; // Y correction for crossing
1322 // Buffering: Leave it constant fot Performance issues
1323 Int_t zints[kNtb]; // Histograming of the z coordinate
1324 // Get 1 and second max probable coodinates in z
1325 Int_t zouts[2*kNtb];
1326 Float_t allowedz[kNtb]; // Allowed z for given time bin
1327 Float_t yres[kNtb]; // Residuals from reference
1328 //Float_t anglecor = fTilt * fZref[1]; // Correction to the angle
1330 Float_t pos[3*kNtb]; memset(pos, 0, 3*kNtb*sizeof(Float_t));
1331 Float_t *fX = &pos[0], *fY = &pos[kNtb], *fZ = &pos[2*kNtb];
1333 Int_t fN = 0; AliTRDcluster *c = 0x0;
1335 for (Int_t i = 0; i < AliTRDtrackerV1::GetNTimeBins(); i++) {
1337 if (!(c = fClusters[i])) continue;
1338 if(!c->IsInChamber()) continue;
1340 //yres[i] = fY[i] - fYref[0] - (fYref[1] + anglecor) * fX[i] + fTilt*(fZ[i] - fZref[0]);
1341 fX[i] = fX0 - c->GetX();
1344 yres[i] = fY[i] - fTilt*(fZ[i] - (fZref[0] - fX[i]*fZref[1]));
1345 zints[fN] = Int_t(fZ[i]);
1350 //printf("Exit fN < kClmin: fN = %d\n", fN);
1353 Int_t nz = AliTRDtrackerV1::Freq(fN, zints, zouts, kFALSE);
1354 Float_t fZProb = zouts[0];
1355 if (nz <= 1) zouts[3] = 0;
1356 if (zouts[1] + zouts[3] < kClmin) {
1357 //printf("Exit zouts[1] = %d, zouts[3] = %d\n",zouts[1],zouts[3]);
1361 // Z distance bigger than pad - length
1362 if (TMath::Abs(zouts[0]-zouts[2]) > 12.0) zouts[3] = 0;
1364 Int_t breaktime = -1;
1365 Bool_t mbefore = kFALSE;
1366 Int_t cumul[kNtb][2];
1367 Int_t counts[2] = { 0, 0 };
1369 if (zouts[3] >= 3) {
1372 // Find the break time allowing one chage on pad-rows
1373 // with maximal number of accepted clusters
1376 for (Int_t i = 0; i < AliTRDtrackerV1::GetNTimeBins(); i++) {
1377 cumul[i][0] = counts[0];
1378 cumul[i][1] = counts[1];
1379 if (TMath::Abs(fZ[i]-zouts[0]) < 2) counts[0]++;
1380 if (TMath::Abs(fZ[i]-zouts[2]) < 2) counts[1]++;
1383 for (Int_t i = 0; i < AliTRDtrackerV1::GetNTimeBins(); i++) {
1384 Int_t after = cumul[AliTRDtrackerV1::GetNTimeBins()][0] - cumul[i][0];
1385 Int_t before = cumul[i][1];
1386 if (after + before > maxcount) {
1387 maxcount = after + before;
1391 after = cumul[AliTRDtrackerV1::GetNTimeBins()-1][1] - cumul[i][1];
1392 before = cumul[i][0];
1393 if (after + before > maxcount) {
1394 maxcount = after + before;
1402 for (Int_t i = 0; i < AliTRDtrackerV1::GetNTimeBins()+1; i++) {
1403 if (i > breaktime) allowedz[i] = mbefore ? zouts[2] : zouts[0];
1404 if (i <= breaktime) allowedz[i] = (!mbefore) ? zouts[2] : zouts[0];
1407 if (((allowedz[0] > allowedz[AliTRDtrackerV1::GetNTimeBins()]) && (fZref[1] < 0)) ||
1408 ((allowedz[0] < allowedz[AliTRDtrackerV1::GetNTimeBins()]) && (fZref[1] > 0))) {
1410 // Tracklet z-direction not in correspondance with track z direction
1413 for (Int_t i = 0; i < AliTRDtrackerV1::GetNTimeBins()+1; i++) {
1414 allowedz[i] = zouts[0]; // Only longest taken
1420 // Cross pad -row tracklet - take the step change into account
1422 for (Int_t i = 0; i < AliTRDtrackerV1::GetNTimeBins()+1; i++) {
1423 if (!fClusters[i]) continue;
1424 if(!fClusters[i]->IsInChamber()) continue;
1425 if (TMath::Abs(fZ[i] - allowedz[i]) > 2) continue;
1427 //yres[i] = fY[i] - fYref[0] - (fYref[1] + anglecor) * fX[i] /*+ fTilt*(fZ[i] - fZref[0])*/;
1428 yres[i] = fY[i] - fTilt*(fZ[i] - (fZref[0] - fX[i]*fZref[1]));
1429 /* if (TMath::Abs(fZ[i] - fZProb) > 2) {
1430 if (fZ[i] > fZProb) yres[i] += fTilt * fPadLength;
1431 if (fZ[i] < fZProb) yres[i] -= fTilt * fPadLength;
1436 Double_t yres2[kNtb];
1439 for (Int_t i = 0; i < AliTRDtrackerV1::GetNTimeBins()+1; i++) {
1440 if (!fClusters[i]) continue;
1441 if(!fClusters[i]->IsInChamber()) continue;
1442 if (TMath::Abs(fZ[i] - allowedz[i]) > 2) continue;
1443 yres2[fN2] = yres[i];
1447 //printf("Exit fN2 < kClmin: fN2 = %d\n", fN2);
1451 AliMathBase::EvaluateUni(fN2,yres2,mean,sigma, Int_t(fN2*kRatio-2.));
1452 if (sigma < sigmaexp * 0.8) {
1455 //Float_t fSigmaY = sigma;
1470 for (Int_t i = 0; i < AliTRDtrackerV1::GetNTimeBins()+1; i++) {
1471 if (!fClusters[i]) continue;
1472 if (!fClusters[i]->IsInChamber()) continue;
1473 if (TMath::Abs(fZ[i] - allowedz[i]) > 2){fClusters[i] = 0x0; continue;}
1474 if (TMath::Abs(yres[i] - mean) > 4.0 * sigma){fClusters[i] = 0x0; continue;}
1477 fMPads += fClusters[i]->GetNPads();
1478 Float_t weight = 1.0;
1479 if (fClusters[i]->GetNPads() > 4) weight = 0.5;
1480 if (fClusters[i]->GetNPads() > 5) weight = 0.2;
1484 //printf("x = %7.3f dy = %7.3f fit %7.3f\n", x, yres[i], fY[i]-yres[i]);
1487 sumwx += x * weight;
1488 sumwx2 += x*x * weight;
1489 sumwy += weight * yres[i];
1490 sumwxy += weight * (yres[i]) * x;
1491 sumwz += weight * fZ[i];
1492 sumwxz += weight * fZ[i] * x;
1497 //printf("Exit fN2 < kClmin(2): fN2 = %d\n",fN2);
1501 fMeanz = sumwz / sumw;
1502 Float_t correction = 0;
1504 // Tracklet on boundary
1505 if (fMeanz < fZProb) correction = ycrosscor;
1506 if (fMeanz > fZProb) correction = -ycrosscor;
1509 Double_t det = sumw * sumwx2 - sumwx * sumwx;
1510 fYfit[0] = (sumwx2 * sumwy - sumwx * sumwxy) / det;
1511 fYfit[1] = (sumw * sumwxy - sumwx * sumwy) / det;
1514 for (Int_t i = 0; i < AliTRDtrackerV1::GetNTimeBins()+1; i++) {
1515 if (!TESTBIT(fUsable,i)) continue;
1516 Float_t delta = yres[i] - fYfit[0] - fYfit[1] * fX[i];
1517 fS2Y += delta*delta;
1519 fS2Y = TMath::Sqrt(fS2Y / Float_t(fN2-2));
1520 // TEMPORARY UNTIL covariance properly calculated
1521 fS2Y = TMath::Max(fS2Y, Float_t(.1));
1523 fZfit[0] = (sumwx2 * sumwz - sumwx * sumwxz) / det;
1524 fZfit[1] = (sumw * sumwxz - sumwx * sumwz) / det;
1525 // fYfitR[0] += fYref[0] + correction;
1526 // fYfitR[1] += fYref[1];
1527 // fYfit[0] = fYfitR[0];
1528 fYfit[1] = -fYfit[1];
1534 //___________________________________________________________________
1535 void AliTRDseedV1::Print(Option_t *o) const
1538 // Printing the seedstatus
1541 AliInfo(Form("Det[%3d] Tilt[%+6.2f] Pad[%5.2f]", fDet, fTilt, fPadLength));
1542 AliInfo(Form("N[%2d] Nuse[%2d]", fN2, fNUsed));
1543 AliInfo(Form("x[%7.2f] y[%7.2f] z[%7.2f] dydx[%5.2f] dzdx[%5.2f]", fX0, fYfit[0], fZfit[0], fYfit[1], fZfit[1]));
1544 AliInfo(Form("Ref y[%7.2f] z[%7.2f] dydx[%5.2f] dzdx[%5.2f]", fYref[0], fZref[0], fYref[1], fZref[1]))
1547 if(strcmp(o, "a")!=0) return;
1549 AliTRDcluster* const* jc = &fClusters[0];
1550 for(int ic=0; ic<kNTimeBins; ic++, jc++) {
1551 if(!(*jc)) continue;
1557 //___________________________________________________________________
1558 Bool_t AliTRDseedV1::IsEqual(const TObject *o) const
1560 // Checks if current instance of the class has the same essential members
1563 if(!o) return kFALSE;
1564 const AliTRDseedV1 *inTracklet = dynamic_cast<const AliTRDseedV1*>(o);
1565 if(!inTracklet) return kFALSE;
1567 for (Int_t i = 0; i < 2; i++){
1568 if ( fYref[i] != inTracklet->fYref[i] ) return kFALSE;
1569 if ( fZref[i] != inTracklet->fZref[i] ) return kFALSE;
1572 if ( fS2Y != inTracklet->fS2Y ) return kFALSE;
1573 if ( fTilt != inTracklet->fTilt ) return kFALSE;
1574 if ( fPadLength != inTracklet->fPadLength ) return kFALSE;
1576 for (Int_t i = 0; i < kNTimeBins; i++){
1577 // if ( fX[i] != inTracklet->GetX(i) ) return kFALSE;
1578 // if ( fY[i] != inTracklet->GetY(i) ) return kFALSE;
1579 // if ( fZ[i] != inTracklet->GetZ(i) ) return kFALSE;
1580 if ( fIndexes[i] != inTracklet->fIndexes[i] ) return kFALSE;
1582 if ( fUsable != inTracklet->fUsable ) return kFALSE;
1584 for (Int_t i=0; i < 2; i++){
1585 if ( fYfit[i] != inTracklet->fYfit[i] ) return kFALSE;
1586 if ( fZfit[i] != inTracklet->fZfit[i] ) return kFALSE;
1587 if ( fLabels[i] != inTracklet->fLabels[i] ) return kFALSE;
1590 /* if ( fMeanz != inTracklet->GetMeanz() ) return kFALSE;
1591 if ( fZProb != inTracklet->GetZProb() ) return kFALSE;*/
1592 if ( fN2 != inTracklet->fN2 ) return kFALSE;
1593 if ( fNUsed != inTracklet->fNUsed ) return kFALSE;
1594 //if ( fFreq != inTracklet->GetFreq() ) return kFALSE;
1595 //if ( fNChange != inTracklet->GetNChange() ) return kFALSE;
1597 if ( fC != inTracklet->fC ) return kFALSE;
1598 //if ( fCC != inTracklet->GetCC() ) return kFALSE;
1599 if ( fChi2 != inTracklet->fChi2 ) return kFALSE;
1600 // if ( fChi2Z != inTracklet->GetChi2Z() ) return kFALSE;
1602 if ( fDet != inTracklet->fDet ) return kFALSE;
1603 if ( fMom != inTracklet->fMom ) return kFALSE;
1604 if ( fdX != inTracklet->fdX ) return kFALSE;
1606 for (Int_t iCluster = 0; iCluster < kNTimeBins; iCluster++){
1607 AliTRDcluster *curCluster = fClusters[iCluster];
1608 AliTRDcluster *inCluster = inTracklet->fClusters[iCluster];
1609 if (curCluster && inCluster){
1610 if (! curCluster->IsEqual(inCluster) ) {
1611 curCluster->Print();
1616 // if one cluster exists, and corresponding
1617 // in other tracklet doesn't - return kFALSE
1618 if(curCluster || inCluster) return kFALSE;