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 memset(fRefCov, 0, 3*sizeof(Double_t));
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 memset(fRefCov, 0, 3*sizeof(Double_t));
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/TMath::Sqrt(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 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(Bool_t force)
479 if(!force) return &fProb[0];
480 if(!CookPID()) return 0x0;
484 //____________________________________________________________
485 Bool_t AliTRDseedV1::CookPID()
487 // Fill probability array for tracklet from the DB.
492 // returns pointer to the probability array and 0x0 if missing DB access
494 // Detailed description
497 // retrive calibration db
498 AliTRDcalibDB *calibration = AliTRDcalibDB::Instance();
500 AliError("No access to calibration data");
504 if (!fReconstructor) {
505 AliError("Reconstructor not set.");
509 // Retrieve the CDB container class with the parametric detector response
510 const AliTRDCalPID *pd = calibration->GetPIDObject(fReconstructor->GetPIDMethod());
512 AliError("No access to AliTRDCalPID object");
515 //AliInfo(Form("Method[%d] : %s", fReconstructor->GetRecoParam() ->GetPIDMethod(), pd->IsA()->GetName()));
517 // calculate tracklet length TO DO
518 Float_t length = (AliTRDgeometry::AmThick() + AliTRDgeometry::DrThick());
519 /// TMath::Sqrt((1.0 - fSnp[iPlane]*fSnp[iPlane]) / (1.0 + fTgl[iPlane]*fTgl[iPlane]));
522 CookdEdx(fReconstructor->GetNdEdxSlices());
524 // Sets the a priori probabilities
525 for(int ispec=0; ispec<AliPID::kSPECIES; ispec++) {
526 fProb[ispec] = pd->GetProbability(ispec, GetMomentum(), &fdEdx[0], length, GetPlane());
532 //____________________________________________________________________
533 Float_t AliTRDseedV1::GetQuality(Bool_t kZcorr) const
536 // Returns a quality measurement of the current seed
539 Float_t zcorr = kZcorr ? GetTilt() * (fZfit[0] - fZref[0]) : 0.;
541 .5 * TMath::Abs(18.0 - GetN())
542 + 10.* TMath::Abs(fYfit[1] - fYref[1])
543 + 5. * TMath::Abs(fYfit[0] - fYref[0] + zcorr)
544 + 2. * TMath::Abs(fZfit[0] - fZref[0]) / GetPadLength();
547 //____________________________________________________________________
548 void AliTRDseedV1::GetCovAt(Double_t x, Double_t *cov) const
550 // Computes covariance in the y-z plane at radial point x (in tracking coordinates)
551 // and returns the results in the preallocated array cov[3] as :
558 // For the linear transformation
562 // The error propagation has the general form
564 // C_{Y} = T_{x} C_{X} T_{x}^{T}
566 // We apply this formula 2 times. First to calculate the covariance of the tracklet
567 // at point x we consider:
569 // T_{x} = (1 x); X=(y0 dy/dx); C_{X}=#(){#splitline{Var(y0) Cov(y0, dy/dx)}{Cov(y0, dy/dx) Var(dy/dx)}}
571 // and secondly to take into account the tilt angle
573 // T_{#alpha} = #(){#splitline{cos(#alpha) __ sin(#alpha)}{-sin(#alpha) __ cos(#alpha)}}; X=(y z); C_{X}=#(){#splitline{Var(y) 0}{0 Var(z)}}
576 // using simple trigonometrics one can write for this last case
578 // 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})}}
580 // which can be aproximated for small alphas (2 deg) with
582 // 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}}}
585 // before applying the tilt rotation we also apply systematic uncertainties to the tracklet
586 // position which can be tunned from outside via the AliTRDrecoParam::SetSysCovMatrix(). They might
587 // account for extra misalignment/miscalibration uncertainties.
590 // Alex Bercuci <A.Bercuci@gsi.de>
591 // Date : Jan 8th 2009
596 Double_t sy2 = fCov[0] +2.*xr*fCov[1] + xr*xr*fCov[2];
597 Double_t sz2 = GetPadLength()*GetPadLength()/12.;
599 // insert systematic uncertainties
601 Double_t sys[15]; memset(sys, 0, 15*sizeof(Double_t));
602 fReconstructor->GetRecoParam()->GetSysCovMatrix(sys);
606 // rotate covariance matrix
607 Double_t t2 = GetTilt()*GetTilt();
608 Double_t correction = 1./(1. + t2);
609 cov[0] = (sy2+t2*sz2)*correction;
610 cov[1] = GetTilt()*(sz2 - sy2)*correction;
611 cov[2] = (t2*sy2+sz2)*correction;
614 //____________________________________________________________
615 Double_t AliTRDseedV1::GetCovSqrt(Double_t *c, Double_t *d)
617 // Helper function to calculate the square root of the covariance matrix.
618 // The input matrix is stored in the vector c and the result in the vector d.
619 // Both arrays have to be initialized by the user with at least 3 elements. Return negative in case of failure.
621 // For calculating the square root of the symmetric matrix c
622 // the following relation is used:
624 // C^{1/2} = VD^{1/2}V^{-1}
626 // with V being the matrix with the n eigenvectors as columns.
627 // In case C is symmetric the followings are true:
628 // - matrix D is diagonal with the diagonal given by the eigenvalues of C
631 // Author A.Bercuci <A.Bercuci@gsi.de>
634 Double_t L[2], // eigenvalues
635 V[3]; // eigenvectors
636 // the secular equation and its solution :
637 // (c[0]-L)(c[2]-L)-c[1]^2 = 0
638 // L^2 - L*Tr(c)+DET(c) = 0
639 // L12 = [Tr(c) +- sqrt(Tr(c)^2-4*DET(c))]/2
640 Double_t Tr = c[0]+c[2], // trace
641 DET = c[0]*c[2]-c[1]*c[1]; // determinant
642 if(TMath::Abs(DET)<1.e-20) return -1.;
643 Double_t DD = TMath::Sqrt(Tr*Tr - 4*DET);
646 if(L[0]<0. || L[1]<0.) return -1.;
651 Double_t tmp = (L[0]-c[0])/c[1];
652 V[0] = TMath::Sqrt(1./(tmp*tmp+1));
654 V[2] = V[1]*c[1]/(L[1]-c[2]);
656 L[0] = TMath::Sqrt(L[0]); L[1] = TMath::Sqrt(L[1]);
657 d[0] = V[0]*V[0]*L[0]+V[1]*V[1]*L[1];
658 d[1] = V[0]*V[1]*L[0]+V[1]*V[2]*L[1];
659 d[2] = V[1]*V[1]*L[0]+V[2]*V[2]*L[1];
664 //____________________________________________________________
665 Double_t AliTRDseedV1::GetCovInv(Double_t *c, Double_t *d)
667 // Helper function to calculate the inverse of the covariance matrix.
668 // The input matrix is stored in the vector c and the result in the vector d.
669 // Both arrays have to be initialized by the user with at least 3 elements
670 // The return value is the determinant or 0 in case of singularity.
672 // Author A.Bercuci <A.Bercuci@gsi.de>
675 Double_t Det = c[0]*c[2] - c[1]*c[1];
676 if(TMath::Abs(Det)<1.e-20) return 0.;
677 Double_t InvDet = 1./Det;
684 //____________________________________________________________________
685 void AliTRDseedV1::Calibrate()
687 // Retrieve calibration and position parameters from OCDB.
688 // The following information are used
690 // - column and row position of first attached cluster. If no clusters are attached
691 // to the tracklet a random central chamber position (c=70, r=7) will be used.
693 // The following information is cached in the tracklet
694 // t0 (trigger delay)
697 // omega*tau = tg(a_L)
698 // diffusion coefficients (longitudinal and transversal)
701 // Alex Bercuci <A.Bercuci@gsi.de>
702 // Date : Jan 8th 2009
705 AliCDBManager *cdb = AliCDBManager::Instance();
706 if(cdb->GetRun() < 0){
707 AliError("OCDB manager not properly initialized");
711 AliTRDcalibDB *calib = AliTRDcalibDB::Instance();
712 AliTRDCalROC *vdROC = calib->GetVdriftROC(fDet),
713 *t0ROC = calib->GetT0ROC(fDet);;
714 const AliTRDCalDet *vdDet = calib->GetVdriftDet();
715 const AliTRDCalDet *t0Det = calib->GetT0Det();
717 Int_t col = 70, row = 7;
718 AliTRDcluster **c = &fClusters[0];
721 while (ic<kNclusters && !(*c)){ic++; c++;}
723 col = (*c)->GetPadCol();
724 row = (*c)->GetPadRow();
728 fT0 = t0Det->GetValue(fDet) + t0ROC->GetValue(col,row);
729 fVD = vdDet->GetValue(fDet) * vdROC->GetValue(col, row);
730 fS2PRF = calib->GetPRFWidth(fDet, col, row); fS2PRF *= fS2PRF;
731 fExB = AliTRDCommonParam::Instance()->GetOmegaTau(fVD);
732 AliTRDCommonParam::Instance()->GetDiffCoeff(fDiffL,
734 SetBit(kCalib, kTRUE);
737 //____________________________________________________________________
738 void AliTRDseedV1::SetOwner()
740 //AliInfo(Form("own [%s] fOwner[%s]", own?"YES":"NO", fOwner?"YES":"NO"));
742 if(TestBit(kOwner)) return;
743 for(int ic=0; ic<kNclusters; ic++){
744 if(!fClusters[ic]) continue;
745 fClusters[ic] = new AliTRDcluster(*fClusters[ic]);
750 //____________________________________________________________
751 void AliTRDseedV1::SetPadPlane(AliTRDpadPlane *p)
753 // Shortcut method to initialize pad geometry.
755 SetTilt(TMath::Tan(TMath::DegToRad()*p->GetTiltingAngle()));
756 SetPadLength(p->GetLengthIPad());
757 SetPadWidth(p->GetWidthIPad());
761 // //____________________________________________________________________
762 // Bool_t AliTRDseedV1::AttachClustersIter(AliTRDtrackingChamber *chamber, Float_t quality, Bool_t kZcorr, AliTRDcluster *c)
765 // // Iterative process to register clusters to the seed.
766 // // In iteration 0 we try only one pad-row and if quality not
767 // // sufficient we try 2 pad-rows (about 5% of tracks cross 2 pad-rows)
772 // if(!fReconstructor->GetRecoParam() ){
773 // AliError("Seed can not be used without a valid RecoParam.");
777 // AliTRDchamberTimeBin *layer = 0x0;
778 // if(fReconstructor->GetStreamLevel(AliTRDReconstructor::kTracker)>=7){
779 // AliTRDtrackingChamber ch(*chamber);
781 // TTreeSRedirector &cstreamer = *fReconstructor->GetDebugStream(AliTRDReconstructor::kTracker);
782 // cstreamer << "AttachClustersIter"
783 // << "chamber.=" << &ch
784 // << "tracklet.=" << this
789 // Double_t kroady = fReconstructor->GetRecoParam() ->GetRoad1y();
790 // Double_t kroadz = GetPadLength() * .5 + 1.;
792 // // initialize configuration parameters
793 // Float_t zcorr = kZcorr ? GetTilt() * (fZfit[0] - fZref[0]) : 0.;
794 // Int_t niter = kZcorr ? 1 : 2;
796 // Double_t yexp, zexp;
798 // // start seed update
799 // for (Int_t iter = 0; iter < niter; iter++) {
801 // for (Int_t iTime = 0; iTime < AliTRDtrackerV1::GetNTimeBins(); iTime++) {
802 // if(!(layer = chamber->GetTB(iTime))) continue;
803 // if(!Int_t(*layer)) continue;
805 // // define searching configuration
806 // Double_t dxlayer = layer->GetX() - fX0;
809 // //Try 2 pad-rows in second iteration
811 // zexp = fZref[0] + fZref[1] * dxlayer - zcorr;
812 // if (zexp > c->GetZ()) zexp = c->GetZ() + GetPadLength()*0.5;
813 // if (zexp < c->GetZ()) zexp = c->GetZ() - GetPadLength()*0.5;
815 // } else zexp = fZref[0] + (kZcorr ? fZref[1] * dxlayer : 0.);
816 // yexp = fYref[0] + fYref[1] * dxlayer - zcorr;
818 // // Get and register cluster
819 // Int_t index = layer->SearchNearestCluster(yexp, zexp, kroady, kroadz);
820 // if (index < 0) continue;
821 // AliTRDcluster *cl = (*layer)[index];
823 // fIndexes[iTime] = layer->GetGlobalIndex(index);
824 // fClusters[iTime] = cl;
825 // // fY[iTime] = cl->GetY();
826 // // fZ[iTime] = cl->GetZ();
829 // if(fReconstructor->GetStreamLevel(AliTRDReconstructor::kTracker)>=7) AliInfo(Form("iter = %d ncl [%d] = %d", iter, fDet, ncl));
832 // // calculate length of the time bin (calibration aware)
833 // Int_t irp = 0; Float_t x[2]={0., 0.}; Int_t tb[2] = {0,0};
834 // for (Int_t iTime = 0; iTime < AliTRDtrackerV1::GetNTimeBins(); iTime++) {
835 // if(!fClusters[iTime]) continue;
836 // x[irp] = fClusters[iTime]->GetX();
841 // Int_t dtb = tb[1] - tb[0];
842 // fdX = dtb ? (x[0] - x[1]) / dtb : 0.15;
844 // // update X0 from the clusters (calibration/alignment aware)
845 // for (Int_t iTime = 0; iTime < AliTRDtrackerV1::GetNTimeBins(); iTime++) {
846 // if(!(layer = chamber->GetTB(iTime))) continue;
847 // if(!layer->IsT0()) continue;
848 // if(fClusters[iTime]){
849 // fX0 = fClusters[iTime]->GetX();
851 // } else { // we have to infere the position of the anode wire from the other clusters
852 // for (Int_t jTime = iTime+1; jTime < AliTRDtrackerV1::GetNTimeBins(); jTime++) {
853 // if(!fClusters[jTime]) continue;
854 // fX0 = fClusters[jTime]->GetX() + fdX * (jTime - iTime);
860 // // update YZ reference point
863 // // update x reference positions (calibration/alignment aware)
864 // // for (Int_t iTime = 0; iTime < AliTRDtrackerV1::GetNTimeBins(); iTime++) {
865 // // if(!fClusters[iTime]) continue;
866 // // fX[iTime] = fX0 - fClusters[iTime]->GetX();
871 // if(fReconstructor->GetStreamLevel(AliTRDReconstructor::kTracker)>=7) AliInfo(Form("iter = %d nclFit [%d] = %d", iter, fDet, fN2));
874 // tquality = GetQuality(kZcorr);
875 // if(tquality < quality) break;
876 // else quality = tquality;
880 // if (!IsOK()) return kFALSE;
882 // if(fReconstructor->GetStreamLevel(AliTRDReconstructor::kTracker)>=1) CookLabels();
884 // // load calibration params
890 //____________________________________________________________________
891 Bool_t AliTRDseedV1::AttachClusters(AliTRDtrackingChamber *chamber, Bool_t tilt)
894 // Projective algorithm to attach clusters to seeding tracklets
900 // Detailed description
901 // 1. Collapse x coordinate for the full detector plane
902 // 2. truncated mean on y (r-phi) direction
904 // 4. truncated mean on z direction
908 Bool_t kPRINT = kFALSE;
909 if(!fReconstructor->GetRecoParam() ){
910 AliError("Seed can not be used without a valid RecoParam.");
913 // Initialize reco params for this tracklet
914 // 1. first time bin in the drift region
916 Int_t kClmin = Int_t(fReconstructor->GetRecoParam() ->GetFindableClusters()*AliTRDtrackerV1::GetNTimeBins());
918 Double_t syRef = TMath::Sqrt(fRefCov[0]);
920 Double_t kroady = 1.;
921 //fReconstructor->GetRecoParam() ->GetRoad1y();
922 Double_t kroadz = GetPadLength() * 1.5 + 1.;
923 if(kPRINT) printf("AttachClusters() sy[%f] road[%f]\n", syRef, kroady);
926 const Int_t kNrows = 16;
927 AliTRDcluster *clst[kNrows][kNclusters];
928 Double_t cond[4], dx, dy, yt, zt,
929 yres[kNrows][kNclusters];
930 Int_t idxs[kNrows][kNclusters], ncl[kNrows], ncls = 0;
931 memset(ncl, 0, kNrows*sizeof(Int_t));
932 memset(clst, 0, kNrows*kNclusters*sizeof(AliTRDcluster*));
934 // Do cluster projection
935 AliTRDcluster *c = 0x0;
936 AliTRDchamberTimeBin *layer = 0x0;
937 Bool_t kBUFFER = kFALSE;
938 for (Int_t it = 0; it < AliTRDtrackerV1::GetNTimeBins(); it++) {
939 if(!(layer = chamber->GetTB(it))) continue;
940 if(!Int_t(*layer)) continue;
942 dx = fX0 - layer->GetX();
943 yt = fYref[0] - fYref[1] * dx;
944 zt = fZref[0] - fZref[1] * dx;
945 if(kPRINT) printf("\t%2d dx[%f] yt[%f] zt[%f]\n", it, dx, yt, zt);
947 // select clusters on a 5 sigmaKalman level
948 cond[0] = yt; cond[2] = kroady;
949 cond[1] = zt; cond[3] = kroadz;
951 layer->GetClusters(cond, idx, n, 6);
952 for(Int_t ic = n; ic--;){
953 c = (*layer)[idx[ic]];
955 dy += tilt ? GetTilt() * (c->GetZ() - zt) : 0.;
956 // select clusters on a 3 sigmaKalman level
957 /* if(tilt && TMath::Abs(dy) > 3.*syRef){
958 printf("too large !!!\n");
961 Int_t r = c->GetPadRow();
962 if(kPRINT) printf("\t\t%d dy[%f] yc[%f] r[%d]\n", ic, TMath::Abs(dy), c->GetY(), r);
964 idxs[r][ncl[r]] = idx[ic];
965 yres[r][ncl[r]] = dy;
968 if(ncl[r] >= kNclusters) {
969 AliWarning(Form("Cluster candidates reached limit %d. Some may be lost.", kNclusters));
976 if(kPRINT) printf("Found %d clusters\n", ncls);
977 if(ncls<kClmin) return kFALSE;
979 // analyze each row individualy
980 Double_t mean, syDis;
981 Int_t nrow[] = {0, 0, 0}, nr = 0, lr=-1;
982 for(Int_t ir=kNrows; ir--;){
983 if(!(ncl[ir])) continue;
984 if(lr>0 && lr-ir != 1){
985 if(kPRINT) printf("W - gap in rows attached !!\n");
987 if(kPRINT) printf("\tir[%d] lr[%d] n[%d]\n", ir, lr, ncl[ir]);
988 // Evaluate truncated mean on the y direction
989 if(ncl[ir] > 3) AliMathBase::EvaluateUni(ncl[ir], yres[ir], mean, syDis, Int_t(ncl[ir]*.8));
991 mean = 0.; syDis = 0.;
994 // TODO check mean and sigma agains cluster resolution !!
995 if(kPRINT) printf("\tr[%2d] m[%f %5.3fsigma] s[%f]\n", ir, mean, TMath::Abs(mean/syRef), syDis);
996 // select clusters on a 3 sigmaDistr level
997 Bool_t kFOUND = kFALSE;
998 for(Int_t ic = ncl[ir]; ic--;){
999 if(yres[ir][ic] - mean > 3. * syDis){
1000 clst[ir][ic] = 0x0; continue;
1002 nrow[nr]++; kFOUND = kTRUE;
1006 lr = ir; if(nr>=3) break;
1008 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]);
1010 // classify cluster rows
1017 SetBit(kRowCross, kTRUE); // mark pad row crossing
1018 if(nrow[0] > nrow[1]){ row = lr+1; lr = -1;}
1027 SetBit(kRowCross, kTRUE); // mark pad row crossing
1030 if(kPRINT) printf("\trow[%d] n[%d]\n\n", row, nrow[0]);
1031 if(row<0) return kFALSE;
1033 // Select and store clusters
1034 // We should consider here :
1035 // 1. How far is the chamber boundary
1036 // 2. How big is the mean
1038 for (Int_t ir = 0; ir < nr; ir++) {
1039 Int_t jr = row + ir*lr;
1040 if(kPRINT) printf("\tattach %d clusters for row %d\n", ncl[jr], jr);
1041 for (Int_t ic = 0; ic < ncl[jr]; ic++) {
1042 if(!(c = clst[jr][ic])) continue;
1043 Int_t it = c->GetPadTime();
1044 // TODO proper indexing of clusters !!
1045 fIndexes[it+kNtb*ir] = chamber->GetTB(it)->GetGlobalIndex(idxs[jr][ic]);
1046 fClusters[it+kNtb*ir] = c;
1048 //printf("\tid[%2d] it[%d] idx[%d]\n", ic, it, fIndexes[it]);
1054 // number of minimum numbers of clusters expected for the tracklet
1056 //AliWarning(Form("Not enough clusters to fit the tracklet %d [%d].", n, kClmin));
1061 // Load calibration parameters for this tracklet
1064 // calculate dx for time bins in the drift region (calibration aware)
1065 Int_t irp = 0; Float_t x[2] = {0.,0.}; Int_t tb[2]={0,0};
1066 for (Int_t it = t0; it < AliTRDtrackerV1::GetNTimeBins(); it++) {
1067 if(!fClusters[it]) continue;
1068 x[irp] = fClusters[it]->GetX();
1073 Int_t dtb = tb[1] - tb[0];
1074 fdX = dtb ? (x[0] - x[1]) / dtb : 0.15;
1079 //____________________________________________________________
1080 void AliTRDseedV1::Bootstrap(const AliTRDReconstructor *rec)
1082 // Fill in all derived information. It has to be called after recovery from file or HLT.
1083 // The primitive data are
1084 // - list of clusters
1085 // - detector (as the detector will be removed from clusters)
1086 // - position of anode wire (fX0) - temporary
1087 // - track reference position and direction
1088 // - momentum of the track
1089 // - time bin length [cm]
1091 // A.Bercuci <A.Bercuci@gsi.de> Oct 30th 2008
1093 fReconstructor = rec;
1095 AliTRDpadPlane *pp = g.GetPadPlane(fDet);
1096 fPad[0] = pp->GetLengthIPad();
1097 fPad[1] = pp->GetWidthIPad();
1098 fPad[3] = TMath::Tan(TMath::DegToRad()*pp->GetTiltingAngle());
1099 //fSnp = fYref[1]/TMath::Sqrt(1+fYref[1]*fYref[1]);
1101 Int_t n = 0, nshare = 0, nused = 0;
1102 AliTRDcluster **cit = &fClusters[0];
1103 for(Int_t ic = kNclusters; ic--; cit++){
1106 if((*cit)->IsShared()) nshare++;
1107 if((*cit)->IsUsed()) nused++;
1109 SetN(n); SetNUsed(nused); SetNShared(nshare);
1116 //____________________________________________________________________
1117 Bool_t AliTRDseedV1::Fit(Bool_t tilt, Int_t errors)
1120 // Linear fit of the tracklet
1125 // True if successful
1127 // Detailed description
1128 // 2. Check if tracklet crosses pad row boundary
1129 // 1. Calculate residuals in the y (r-phi) direction
1130 // 3. Do a Least Square Fit to the data
1133 if(!IsCalibrated()){
1134 AliWarning("Tracklet fit failed. Call Calibrate().");
1138 const Int_t kClmin = 8;
1141 // cluster error parametrization parameters
1142 // 1. sy total charge
1143 const Float_t sq0inv = 0.019962; // [1/q0]
1144 const Float_t sqb = 1.0281564; //[cm]
1145 // 2. sy for the PRF
1146 const Float_t scy[AliTRDgeometry::kNlayer][4] = {
1147 {2.827e-02, 9.600e-04, 4.296e-01, 2.271e-02},
1148 {2.952e-02,-2.198e-04, 4.146e-01, 2.339e-02},
1149 {3.090e-02, 1.514e-03, 4.020e-01, 2.402e-02},
1150 {3.260e-02,-2.037e-03, 3.946e-01, 2.509e-02},
1151 {3.439e-02,-3.601e-04, 3.883e-01, 2.623e-02},
1152 {3.510e-02, 2.066e-03, 3.651e-01, 2.588e-02},
1154 // 3. sy parallel to the track
1155 const Float_t sy0 = 2.649e-02; // [cm]
1156 const Float_t sya = -8.864e-04; // [cm]
1157 const Float_t syb = -2.435e-01; // [cm]
1159 // 4. sx parallel to the track
1160 const Float_t sxgc = 5.427e-02;
1161 const Float_t sxgm = 7.783e-01;
1162 const Float_t sxgs = 2.743e-01;
1163 const Float_t sxe0 =-2.065e+00;
1164 const Float_t sxe1 =-2.978e-02;
1166 // 5. sx perpendicular to the track
1167 // const Float_t sxd0 = 1.881e-02;
1168 // const Float_t sxd1 =-4.101e-01;
1169 // const Float_t sxd2 = 1.572e+00;
1171 // get track direction
1172 Double_t y0 = fYref[0];
1173 Double_t dydx = fYref[1];
1174 Double_t z0 = fZref[0];
1175 Double_t dzdx = fZref[1];
1178 // calculation of tg^2(phi - a_L) and tg^2(a_L)
1179 Double_t tgg = (dydx-fExB)/(1.+dydx*fExB); tgg *= tgg;
1180 //Double_t exb2= fExB*fExB;
1182 //AliTRDtrackerV1::AliTRDLeastSquare fitterZ;
1183 TLinearFitter fitterY(1, "pol1");
1184 // convertion factor from square to gauss distribution for sigma
1185 //Double_t convert = 1./TMath::Sqrt(12.);
1187 // book cluster information
1188 Double_t qc[kNclusters], xc[kNclusters], yc[kNclusters], zc[kNclusters], sy[kNclusters];
1190 Int_t ily = AliTRDgeometry::GetLayer(fDet);
1192 AliTRDcluster *c=0x0, **jc = &fClusters[0];
1193 for (Int_t ic=0; ic<kNtb; ic++, ++jc) {
1200 if(!(c = (*jc))) continue;
1201 if(!c->IsInChamber()) continue;
1204 if(c->GetNPads()>4) w = .5;
1205 if(c->GetNPads()>5) w = .2;
1207 //zRow[fN] = c->GetPadRow();
1208 qc[n] = TMath::Abs(c->GetQ());
1209 // correct cluster position for PRF and v drift
1210 //Int_t jc = TMath::Max(fN-3, 0);
1211 //xc[fN] = c->GetXloc(fT0, fVD, &qc[jc], &xc[jc]/*, z0 - c->GetX()*dzdx*/);
1212 //Double_t s2 = fS2PRF + fDiffL*fDiffL*xc[fN]/(1.+2.*exb2)+tgg*xc[fN]*xc[fN]*exb2/12.;
1213 //yc[fN] = c->GetYloc(s2, GetPadWidth(), xc[fN], fExB);
1215 // uncalibrated cluster correction
1218 //GetClusterXY(c, x, y);
1219 x = c->GetX(); y = c->GetY();
1224 // extrapolated y value for the track
1225 yt = y0 - xc[n]*dydx;
1226 // extrapolated z value for the track
1227 zt = z0 - xc[n]*dzdx;
1229 if(tilt) yc[n] -= GetTilt()*(zc[n] - zt);
1231 // ELABORATE CLUSTER ERROR
1232 // TODO to be moved to AliTRDcluster
1233 // basic y error (|| to track).
1234 sy[n] = xc[n] < AliTRDgeometry::CamHght() ? 2. : sy0 + sya*TMath::Exp(1./(xc[n]+syb));
1235 //printf("cluster[%d]\n\tsy[0] = %5.3e [um]\n", fN, sy[fN]*1.e4);
1236 // y error due to total charge
1237 sy[n] += sqb*(1./qc[n] - sq0inv);
1238 //printf("\tsy[1] = %5.3e [um]\n", sy[fN]*1.e4);
1239 // y error due to PRF
1240 sy[n] += scy[ily][0]*TMath::Gaus(c->GetCenter(), scy[ily][1], scy[ily][2]) - scy[ily][3];
1241 //printf("\tsy[2] = %5.3e [um]\n", sy[fN]*1.e4);
1246 // error of drift length parallel to the track
1247 Double_t sx = sxgc*TMath::Gaus(xc[n], sxgm, sxgs) + TMath::Exp(sxe0+sxe1*xc[n]); // [cm]
1248 //printf("\tsx[0] = %5.3e [um]\n", sx*1.e4);
1249 // error of drift length perpendicular to the track
1250 //sx += sxd0 + sxd1*d + sxd2*d*d;
1251 sx *= sx; // square sx
1253 // add error from ExB
1254 if(errors>0) sy[n] += fExB*fExB*sx;
1255 //printf("\tsy[3] = %5.3e [um^2]\n", sy[fN]*1.e8);
1257 // global radial error due to misalignment/miscalibration
1258 Double_t sx0 = 0.; sx0 *= sx0;
1259 // add sx contribution to sy due to track angle
1260 if(errors>1) sy[n] += tgg*(sx+sx0);
1261 // TODO we should add tilt pad correction here
1262 //printf("\tsy[4] = %5.3e [um^2]\n", sy[fN]*1.e8);
1263 c->SetSigmaY2(sy[n]);
1265 sy[n] = TMath::Sqrt(sy[n]);
1266 fitterY.AddPoint(&xc[n], yc[n], sy[n]);
1270 if (n < kClmin) return kFALSE;
1274 fYfit[0] = fitterY.GetParameter(0);
1275 fYfit[1] = -fitterY.GetParameter(1);
1277 Double_t *p = fitterY.GetCovarianceMatrix();
1278 fCov[0] = p[0]; // variance of y0
1279 fCov[1] = p[1]; // covariance of y0, dydx
1280 fCov[2] = p[3]; // variance of dydx
1281 // the ref radial position is set at the minimum of
1282 // the y variance of the tracklet
1283 fX = -fCov[1]/fCov[2]; //fXref = fX0 - fXref;
1284 fS2Y = fCov[0] +2.*fX*fCov[1] + fX*fX*fCov[2];
1288 // TODO pad row cross position estimation !!!
1289 //AliInfo(Form("Padrow cross in detector %d", fDet));
1290 fZfit[0] = .5*(zc[0]+zc[n-1]); fZfit[1] = 0.;
1291 fS2Z = 0.02+1.55*fZref[1]; fS2Z *= fS2Z;
1293 fZfit[0] = zc[0]; fZfit[1] = 0.;
1294 fS2Z = GetPadLength()*GetPadLength()/12.;
1298 // // determine z offset of the fit
1299 // Float_t zslope = 0.;
1300 // Int_t nchanges = 0, nCross = 0;
1301 // if(nz==2){ // tracklet is crossing pad row
1302 // // Find the break time allowing one chage on pad-rows
1303 // // with maximal number of accepted clusters
1304 // Int_t padRef = zRow[0];
1305 // for (Int_t ic=1; ic<fN; ic++) {
1306 // if(zRow[ic] == padRef) continue;
1309 // if(zRow[ic-1] == zRow[ic]){
1310 // printf("ERROR in pad row change!!!\n");
1313 // // evaluate parameters of the crossing point
1314 // Float_t sx = (xc[ic-1] - xc[ic])*convert;
1315 // fCross[0] = .5 * (xc[ic-1] + xc[ic]);
1316 // fCross[2] = .5 * (zc[ic-1] + zc[ic]);
1317 // fCross[3] = TMath::Max(dzdx * sx, .01);
1318 // zslope = zc[ic-1] > zc[ic] ? 1. : -1.;
1319 // padRef = zRow[ic];
1325 // // condition on nCross and reset nchanges TODO
1328 // if(dzdx * zslope < 0.){
1329 // AliInfo("Tracklet-Track mismatch in dzdx. TODO.");
1333 // //zc[nc] = fitterZ.GetFunctionParameter(0);
1334 // fCross[1] = fYfit[0] - fCross[0] * fYfit[1];
1335 // fCross[0] = fX0 - fCross[0];
1343 //_____________________________________________________________________________
1344 void AliTRDseedV1::FitMI()
1348 // Marian Ivanov's version
1350 // linear fit on the y direction with respect to the reference direction.
1351 // The residuals for each x (x = xc - x0) are deduced from:
1353 // the tilting correction is written :
1354 // y = yc + h*(zc-zt) (2)
1355 // yt = y0+dy/dx*x (3)
1356 // zt = z0+dz/dx*x (4)
1357 // from (1),(2),(3) and (4)
1358 // dy = yc - y0 - (dy/dx + h*dz/dx)*x + h*(zc-z0)
1359 // the last term introduces the correction on y direction due to tilting pads. There are 2 ways to account for this:
1360 // 1. use tilting correction for calculating the y
1361 // 2. neglect tilting correction here and account for it in the error parametrization of the tracklet.
1362 const Float_t kRatio = 0.8;
1363 const Int_t kClmin = 5;
1364 const Float_t kmaxtan = 2;
1366 if (TMath::Abs(fYref[1]) > kmaxtan){
1367 //printf("Exit: Abs(fYref[1]) = %3.3f, kmaxtan = %3.3f\n", TMath::Abs(fYref[1]), kmaxtan);
1368 return; // Track inclined too much
1371 Float_t sigmaexp = 0.05 + TMath::Abs(fYref[1] * 0.25); // Expected r.m.s in y direction
1372 Float_t ycrosscor = GetPadLength() * GetTilt() * 0.5; // Y correction for crossing
1383 // Buffering: Leave it constant fot Performance issues
1384 Int_t zints[kNtb]; // Histograming of the z coordinate
1385 // Get 1 and second max probable coodinates in z
1386 Int_t zouts[2*kNtb];
1387 Float_t allowedz[kNtb]; // Allowed z for given time bin
1388 Float_t yres[kNtb]; // Residuals from reference
1389 //Float_t anglecor = GetTilt() * fZref[1]; // Correction to the angle
1391 Float_t pos[3*kNtb]; memset(pos, 0, 3*kNtb*sizeof(Float_t));
1392 Float_t *fX = &pos[0], *fY = &pos[kNtb], *fZ = &pos[2*kNtb];
1394 Int_t fN = 0; AliTRDcluster *c = 0x0;
1396 for (Int_t i = 0; i < AliTRDtrackerV1::GetNTimeBins(); i++) {
1398 if (!(c = fClusters[i])) continue;
1399 if(!c->IsInChamber()) continue;
1401 //yres[i] = fY[i] - fYref[0] - (fYref[1] + anglecor) * fX[i] + GetTilt()*(fZ[i] - fZref[0]);
1402 fX[i] = fX0 - c->GetX();
1405 yres[i] = fY[i] - GetTilt()*(fZ[i] - (fZref[0] - fX[i]*fZref[1]));
1406 zints[fN] = Int_t(fZ[i]);
1411 //printf("Exit fN < kClmin: fN = %d\n", fN);
1414 Int_t nz = AliTRDtrackerV1::Freq(fN, zints, zouts, kFALSE);
1415 Float_t fZProb = zouts[0];
1416 if (nz <= 1) zouts[3] = 0;
1417 if (zouts[1] + zouts[3] < kClmin) {
1418 //printf("Exit zouts[1] = %d, zouts[3] = %d\n",zouts[1],zouts[3]);
1422 // Z distance bigger than pad - length
1423 if (TMath::Abs(zouts[0]-zouts[2]) > 12.0) zouts[3] = 0;
1425 Int_t breaktime = -1;
1426 Bool_t mbefore = kFALSE;
1427 Int_t cumul[kNtb][2];
1428 Int_t counts[2] = { 0, 0 };
1430 if (zouts[3] >= 3) {
1433 // Find the break time allowing one chage on pad-rows
1434 // with maximal number of accepted clusters
1437 for (Int_t i = 0; i < AliTRDtrackerV1::GetNTimeBins(); i++) {
1438 cumul[i][0] = counts[0];
1439 cumul[i][1] = counts[1];
1440 if (TMath::Abs(fZ[i]-zouts[0]) < 2) counts[0]++;
1441 if (TMath::Abs(fZ[i]-zouts[2]) < 2) counts[1]++;
1444 for (Int_t i = 0; i < AliTRDtrackerV1::GetNTimeBins(); i++) {
1445 Int_t after = cumul[AliTRDtrackerV1::GetNTimeBins()][0] - cumul[i][0];
1446 Int_t before = cumul[i][1];
1447 if (after + before > maxcount) {
1448 maxcount = after + before;
1452 after = cumul[AliTRDtrackerV1::GetNTimeBins()-1][1] - cumul[i][1];
1453 before = cumul[i][0];
1454 if (after + before > maxcount) {
1455 maxcount = after + before;
1463 for (Int_t i = 0; i < AliTRDtrackerV1::GetNTimeBins()+1; i++) {
1464 if (i > breaktime) allowedz[i] = mbefore ? zouts[2] : zouts[0];
1465 if (i <= breaktime) allowedz[i] = (!mbefore) ? zouts[2] : zouts[0];
1468 if (((allowedz[0] > allowedz[AliTRDtrackerV1::GetNTimeBins()]) && (fZref[1] < 0)) ||
1469 ((allowedz[0] < allowedz[AliTRDtrackerV1::GetNTimeBins()]) && (fZref[1] > 0))) {
1471 // Tracklet z-direction not in correspondance with track z direction
1474 for (Int_t i = 0; i < AliTRDtrackerV1::GetNTimeBins()+1; i++) {
1475 allowedz[i] = zouts[0]; // Only longest taken
1481 // Cross pad -row tracklet - take the step change into account
1483 for (Int_t i = 0; i < AliTRDtrackerV1::GetNTimeBins()+1; i++) {
1484 if (!fClusters[i]) continue;
1485 if(!fClusters[i]->IsInChamber()) continue;
1486 if (TMath::Abs(fZ[i] - allowedz[i]) > 2) continue;
1488 //yres[i] = fY[i] - fYref[0] - (fYref[1] + anglecor) * fX[i] + GetTilt()*(fZ[i] - fZref[0]);
1489 yres[i] = fY[i] - GetTilt()*(fZ[i] - (fZref[0] - fX[i]*fZref[1]));
1490 // if (TMath::Abs(fZ[i] - fZProb) > 2) {
1491 // if (fZ[i] > fZProb) yres[i] += GetTilt() * GetPadLength();
1492 // if (fZ[i] < fZProb) yres[i] -= GetTilt() * GetPadLength();
1497 Double_t yres2[kNtb];
1500 for (Int_t i = 0; i < AliTRDtrackerV1::GetNTimeBins()+1; i++) {
1501 if (!fClusters[i]) continue;
1502 if(!fClusters[i]->IsInChamber()) continue;
1503 if (TMath::Abs(fZ[i] - allowedz[i]) > 2) continue;
1504 yres2[fN2] = yres[i];
1508 //printf("Exit fN2 < kClmin: fN2 = %d\n", fN2);
1512 AliMathBase::EvaluateUni(fN2,yres2,mean,sigma, Int_t(fN2*kRatio-2.));
1513 if (sigma < sigmaexp * 0.8) {
1516 //Float_t fSigmaY = sigma;
1531 for (Int_t i = 0; i < AliTRDtrackerV1::GetNTimeBins()+1; i++) {
1532 if (!fClusters[i]) continue;
1533 if (!fClusters[i]->IsInChamber()) continue;
1534 if (TMath::Abs(fZ[i] - allowedz[i]) > 2){fClusters[i] = 0x0; continue;}
1535 if (TMath::Abs(yres[i] - mean) > 4.0 * sigma){fClusters[i] = 0x0; continue;}
1538 fMPads += fClusters[i]->GetNPads();
1539 Float_t weight = 1.0;
1540 if (fClusters[i]->GetNPads() > 4) weight = 0.5;
1541 if (fClusters[i]->GetNPads() > 5) weight = 0.2;
1545 //printf("x = %7.3f dy = %7.3f fit %7.3f\n", x, yres[i], fY[i]-yres[i]);
1548 sumwx += x * weight;
1549 sumwx2 += x*x * weight;
1550 sumwy += weight * yres[i];
1551 sumwxy += weight * (yres[i]) * x;
1552 sumwz += weight * fZ[i];
1553 sumwxz += weight * fZ[i] * x;
1558 //printf("Exit fN2 < kClmin(2): fN2 = %d\n",fN2);
1562 fMeanz = sumwz / sumw;
1563 Float_t correction = 0;
1565 // Tracklet on boundary
1566 if (fMeanz < fZProb) correction = ycrosscor;
1567 if (fMeanz > fZProb) correction = -ycrosscor;
1570 Double_t det = sumw * sumwx2 - sumwx * sumwx;
1571 fYfit[0] = (sumwx2 * sumwy - sumwx * sumwxy) / det;
1572 fYfit[1] = (sumw * sumwxy - sumwx * sumwy) / det;
1575 for (Int_t i = 0; i < AliTRDtrackerV1::GetNTimeBins()+1; i++) {
1576 if (!TESTBIT(fUsable,i)) continue;
1577 Float_t delta = yres[i] - fYfit[0] - fYfit[1] * fX[i];
1578 fS2Y += delta*delta;
1580 fS2Y = TMath::Sqrt(fS2Y / Float_t(fN2-2));
1581 // TEMPORARY UNTIL covariance properly calculated
1582 fS2Y = TMath::Max(fS2Y, Float_t(.1));
1584 fZfit[0] = (sumwx2 * sumwz - sumwx * sumwxz) / det;
1585 fZfit[1] = (sumw * sumwxz - sumwx * sumwz) / det;
1586 // fYfitR[0] += fYref[0] + correction;
1587 // fYfitR[1] += fYref[1];
1588 // fYfit[0] = fYfitR[0];
1589 fYfit[1] = -fYfit[1];
1594 //___________________________________________________________________
1595 void AliTRDseedV1::Print(Option_t *o) const
1598 // Printing the seedstatus
1601 AliInfo(Form("Det[%3d] X0[%7.2f] Pad[L[%5.2f] W[%5.2f] Tilt[%+6.2f]]", fDet, fX0, GetPadLength(), GetPadWidth(), GetTilt()));
1602 AliInfo(Form("N[%2d] Nused[%2d] Nshared[%2d] [%d]", GetN(), GetNUsed(), GetNShared(), fN));
1604 Double_t cov[3], x=GetX();
1606 AliInfo(" | x[cm] | y[cm] | z[cm] | dydx | dzdx |");
1607 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]));
1608 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]))
1611 if(strcmp(o, "a")!=0) return;
1613 AliTRDcluster* const* jc = &fClusters[0];
1614 for(int ic=0; ic<kNclusters; ic++, jc++) {
1615 if(!(*jc)) continue;
1621 //___________________________________________________________________
1622 Bool_t AliTRDseedV1::IsEqual(const TObject *o) const
1624 // Checks if current instance of the class has the same essential members
1627 if(!o) return kFALSE;
1628 const AliTRDseedV1 *inTracklet = dynamic_cast<const AliTRDseedV1*>(o);
1629 if(!inTracklet) return kFALSE;
1631 for (Int_t i = 0; i < 2; i++){
1632 if ( fYref[i] != inTracklet->fYref[i] ) return kFALSE;
1633 if ( fZref[i] != inTracklet->fZref[i] ) return kFALSE;
1636 if ( fS2Y != inTracklet->fS2Y ) return kFALSE;
1637 if ( GetTilt() != inTracklet->GetTilt() ) return kFALSE;
1638 if ( GetPadLength() != inTracklet->GetPadLength() ) return kFALSE;
1640 for (Int_t i = 0; i < kNclusters; i++){
1641 // if ( fX[i] != inTracklet->GetX(i) ) return kFALSE;
1642 // if ( fY[i] != inTracklet->GetY(i) ) return kFALSE;
1643 // if ( fZ[i] != inTracklet->GetZ(i) ) return kFALSE;
1644 if ( fIndexes[i] != inTracklet->fIndexes[i] ) return kFALSE;
1646 // if ( fUsable != inTracklet->fUsable ) return kFALSE;
1648 for (Int_t i=0; i < 2; i++){
1649 if ( fYfit[i] != inTracklet->fYfit[i] ) return kFALSE;
1650 if ( fZfit[i] != inTracklet->fZfit[i] ) return kFALSE;
1651 if ( fLabels[i] != inTracklet->fLabels[i] ) return kFALSE;
1654 /* if ( fMeanz != inTracklet->GetMeanz() ) return kFALSE;
1655 if ( fZProb != inTracklet->GetZProb() ) return kFALSE;*/
1656 if ( fN != inTracklet->fN ) return kFALSE;
1657 //if ( fNUsed != inTracklet->fNUsed ) return kFALSE;
1658 //if ( fFreq != inTracklet->GetFreq() ) return kFALSE;
1659 //if ( fNChange != inTracklet->GetNChange() ) return kFALSE;
1661 if ( fC != inTracklet->fC ) return kFALSE;
1662 //if ( fCC != inTracklet->GetCC() ) return kFALSE;
1663 if ( fChi2 != inTracklet->fChi2 ) return kFALSE;
1664 // if ( fChi2Z != inTracklet->GetChi2Z() ) return kFALSE;
1666 if ( fDet != inTracklet->fDet ) return kFALSE;
1667 if ( fPt != inTracklet->fPt ) return kFALSE;
1668 if ( fdX != inTracklet->fdX ) return kFALSE;
1670 for (Int_t iCluster = 0; iCluster < kNclusters; iCluster++){
1671 AliTRDcluster *curCluster = fClusters[iCluster];
1672 AliTRDcluster *inCluster = inTracklet->fClusters[iCluster];
1673 if (curCluster && inCluster){
1674 if (! curCluster->IsEqual(inCluster) ) {
1675 curCluster->Print();
1680 // if one cluster exists, and corresponding
1681 // in other tracklet doesn't - return kFALSE
1682 if(curCluster || inCluster) return kFALSE;