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, 7*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, 7*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, 7*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
293 Double_t fSnp = trk->GetSnp();
294 Double_t fTgl = trk->GetTgl();
296 fYref[1] = fSnp/TMath::Sqrt(1. - fSnp*fSnp);
298 SetCovRef(trk->GetCovariance());
300 Double_t dx = trk->GetX() - fX0;
301 fYref[0] = trk->GetY() - dx*fYref[1];
302 fZref[0] = trk->GetZ() - dx*fZref[1];
305 //_____________________________________________________________________________
306 void AliTRDseedV1::UpdateUsed()
309 // Calculate number of used clusers in the tracklet
312 Int_t nused = 0, nshared = 0;
313 for (Int_t i = kNclusters; i--; ) {
314 if (!fClusters[i]) continue;
315 if(fClusters[i]->IsUsed()){
317 } else if(fClusters[i]->IsShared()){
318 if(IsStandAlone()) nused++;
326 //_____________________________________________________________________________
327 void AliTRDseedV1::UseClusters()
332 // In stand alone mode:
333 // Clusters which are marked as used or shared from another track are
334 // removed from the tracklet
337 // - Clusters which are used by another track become shared
338 // - Clusters which are attached to a kink track become shared
340 AliTRDcluster **c = &fClusters[0];
341 for (Int_t ic=kNclusters; ic--; c++) {
344 if((*c)->IsShared() || (*c)->IsUsed()){
345 if((*c)->IsShared()) SetNShared(GetNShared()-1);
346 else SetNUsed(GetNUsed()-1);
353 if((*c)->IsUsed() || IsKink()){
364 //____________________________________________________________________
365 void AliTRDseedV1::CookdEdx(Int_t nslices)
367 // Calculates average dE/dx for all slices and store them in the internal array fdEdx.
370 // nslices : number of slices for which dE/dx should be calculated
372 // store results in the internal array fdEdx. This can be accessed with the method
373 // AliTRDseedV1::GetdEdx()
375 // Detailed description
376 // Calculates average dE/dx for all slices. Depending on the PID methode
377 // the number of slices can be 3 (LQ) or 8(NN).
378 // The calculation of dQ/dl are done using the tracklet fit results (see AliTRDseedV1::GetdQdl(Int_t))
380 // The following effects are included in the calculation:
381 // 1. calibration values for t0 and vdrift (using x coordinate to calculate slice)
382 // 2. cluster sharing (optional see AliTRDrecoParam::SetClusterSharing())
386 Int_t nclusters[kNslices];
387 memset(nclusters, 0, kNslices*sizeof(Int_t));
388 memset(fdEdx, 0, kNslices*sizeof(Float_t));
390 const Double_t kDriftLength = (.5 * AliTRDgeometry::AmThick() + AliTRDgeometry::DrThick());
392 AliTRDcluster *c = 0x0;
393 for(int ic=0; ic<AliTRDtrackerV1::GetNTimeBins(); ic++){
394 if(!(c = fClusters[ic]) && !(c = fClusters[ic+kNtb])) continue;
395 Float_t dx = TMath::Abs(fX0 - c->GetX());
397 // Filter clusters for dE/dx calculation
399 // 1.consider calibration effects for slice determination
401 if(dx<kDriftLength){ // TODO should be replaced by c->IsInChamber()
402 slice = Int_t(dx * nslices / kDriftLength);
403 } else slice = c->GetX() < fX0 ? nslices-1 : 0;
406 // 2. take sharing into account
407 Float_t w = /*c->IsShared() ? .5 :*/ 1.;
409 // 3. take into account large clusters TODO
410 //w *= c->GetNPads() > 3 ? .8 : 1.;
413 fdEdx[slice] += w * GetdQdl(ic); //fdQdl[ic];
415 } // End of loop over clusters
417 //if(fReconstructor->GetPIDMethod() == AliTRDReconstructor::kLQPID){
418 if(nslices == AliTRDpidUtil::kLQslices){
419 // calculate mean charge per slice (only LQ PID)
420 for(int is=0; is<nslices; is++){
421 if(nclusters[is]) fdEdx[is] /= nclusters[is];
426 //_____________________________________________________________________________
427 void AliTRDseedV1::CookLabels()
430 // Cook 2 labels for seed
436 for (Int_t i = 0; i < kNclusters; i++) {
437 if (!fClusters[i]) continue;
438 for (Int_t ilab = 0; ilab < 3; ilab++) {
439 if (fClusters[i]->GetLabel(ilab) >= 0) {
440 labels[nlab] = fClusters[i]->GetLabel(ilab);
446 fLabels[2] = AliMathBase::Freq(nlab,labels,out,kTRUE);
448 if ((fLabels[2] > 1) && (out[3] > 1)) fLabels[1] = out[2];
452 //____________________________________________________________________
453 Float_t AliTRDseedV1::GetdQdl(Int_t ic, Float_t *dl) const
455 // Using the linear approximation of the track inside one TRD chamber (TRD tracklet)
456 // the charge per unit length can be written as:
458 // #frac{dq}{dl} = #frac{q_{c}}{dx * #sqrt{1 + #(){#frac{dy}{dx}}^{2}_{fit} + #(){#frac{dy}{dx}}^{2}_{ref}}}
460 // where qc is the total charge collected in the current time bin and dx is the length
462 // The following correction are applied :
463 // - charge : pad row cross corrections
464 // [diffusion and TRF assymetry] TODO
465 // - dx : anisochronity, track inclination - see Fit and AliTRDcluster::GetXloc()
466 // and AliTRDcluster::GetYloc() for the effects taken into account
468 // Author : Alex Bercuci <A.Bercuci@gsi.de>
472 if(!fClusters[ic]->IsInChamber()) return 0.;
473 dq += TMath::Abs(fClusters[ic]->GetQ());
475 if(fClusters[ic+kNtb]) dq += TMath::Abs(fClusters[ic+kNtb]->GetQ());
476 if(dq<1.e-3) return 0.;
479 if(ic-1>=0 && ic+1<kNtb){
480 Float_t x2(0.), x1(0.);
481 // try to estimate upper radial position
482 if(fClusters[ic-1]) x2 = fClusters[ic-1]->GetX();
483 else if(fClusters[ic-1+kNtb]) x2 = fClusters[ic-1+kNtb]->GetX();
484 else if(fClusters[ic]) x2 = fClusters[ic]->GetX()+fdX;
485 else x2 = fClusters[ic+kNtb]->GetX()+fdX;
486 // try to estimate lower radial position
487 if(fClusters[ic+1]) x1 = fClusters[ic+1]->GetX();
488 else if(fClusters[ic+1+kNtb]) x1 = fClusters[ic+1+kNtb]->GetX();
489 else if(fClusters[ic]) x1 = fClusters[ic]->GetX()-fdX;
490 else x1 = fClusters[ic+kNtb]->GetX()-fdX;
494 dx *= TMath::Sqrt(1. + fYfit[1]*fYfit[1] + fZref[1]*fZref[1]);
500 //____________________________________________________________
501 Float_t AliTRDseedV1::GetMomentum(Float_t *err) const
503 // Returns momentum of the track after update with the current tracklet as:
505 // p=#frac{1}{1/p_{t}} #sqrt{1+tgl^{2}}
507 // and optionally the momentum error (if err is not null).
508 // The estimated variance of the momentum is given by:
510 // #sigma_{p}^{2} = (#frac{dp}{dp_{t}})^{2} #sigma_{p_{t}}^{2}+(#frac{dp}{dtgl})^{2} #sigma_{tgl}^{2}+2#frac{dp}{dp_{t}}#frac{dp}{dtgl} cov(tgl,1/p_{t})
512 // which can be simplified to
514 // #sigma_{p}^{2} = p^{2}p_{t}^{4}tgl^{2}#sigma_{tgl}^{2}-2p^{2}p_{t}^{3}tgl cov(tgl,1/p_{t})+p^{2}p_{t}^{2}#sigma_{1/p_{t}}^{2}
518 Double_t p = fPt*TMath::Sqrt(1.+fZref[1]*fZref[1]);
520 Double_t tgl2 = fZref[1]*fZref[1];
521 Double_t pt2 = fPt*fPt;
524 p2*tgl2*pt2*pt2*fRefCov[4]
525 -2.*p2*fZref[1]*fPt*pt2*fRefCov[5]
527 (*err) = TMath::Sqrt(s2);
533 //____________________________________________________________________
534 Float_t* AliTRDseedV1::GetProbability(Bool_t force)
536 if(!force) return &fProb[0];
537 if(!CookPID()) return 0x0;
541 //____________________________________________________________
542 Bool_t AliTRDseedV1::CookPID()
544 // Fill probability array for tracklet from the DB.
549 // returns pointer to the probability array and 0x0 if missing DB access
551 // Detailed description
554 // retrive calibration db
555 AliTRDcalibDB *calibration = AliTRDcalibDB::Instance();
557 AliError("No access to calibration data");
561 if (!fReconstructor) {
562 AliError("Reconstructor not set.");
566 // Retrieve the CDB container class with the parametric detector response
567 const AliTRDCalPID *pd = calibration->GetPIDObject(fReconstructor->GetPIDMethod());
569 AliError("No access to AliTRDCalPID object");
572 //AliInfo(Form("Method[%d] : %s", fReconstructor->GetRecoParam() ->GetPIDMethod(), pd->IsA()->GetName()));
574 // calculate tracklet length TO DO
575 Float_t length = (AliTRDgeometry::AmThick() + AliTRDgeometry::DrThick());
576 /// TMath::Sqrt((1.0 - fSnp[iPlane]*fSnp[iPlane]) / (1.0 + fTgl[iPlane]*fTgl[iPlane]));
579 CookdEdx(fReconstructor->GetNdEdxSlices());
581 // Sets the a priori probabilities
582 for(int ispec=0; ispec<AliPID::kSPECIES; ispec++) {
583 fProb[ispec] = pd->GetProbability(ispec, GetMomentum(), &fdEdx[0], length, GetPlane());
589 //____________________________________________________________________
590 Float_t AliTRDseedV1::GetQuality(Bool_t kZcorr) const
593 // Returns a quality measurement of the current seed
596 Float_t zcorr = kZcorr ? GetTilt() * (fZfit[0] - fZref[0]) : 0.;
598 .5 * TMath::Abs(18.0 - GetN())
599 + 10.* TMath::Abs(fYfit[1] - fYref[1])
600 + 5. * TMath::Abs(fYfit[0] - fYref[0] + zcorr)
601 + 2. * TMath::Abs(fZfit[0] - fZref[0]) / GetPadLength();
604 //____________________________________________________________________
605 void AliTRDseedV1::GetCovAt(Double_t x, Double_t *cov) const
607 // Computes covariance in the y-z plane at radial point x (in tracking coordinates)
608 // and returns the results in the preallocated array cov[3] as :
615 // For the linear transformation
619 // The error propagation has the general form
621 // C_{Y} = T_{x} C_{X} T_{x}^{T}
623 // We apply this formula 2 times. First to calculate the covariance of the tracklet
624 // at point x we consider:
626 // T_{x} = (1 x); X=(y0 dy/dx); C_{X}=#(){#splitline{Var(y0) Cov(y0, dy/dx)}{Cov(y0, dy/dx) Var(dy/dx)}}
628 // and secondly to take into account the tilt angle
630 // T_{#alpha} = #(){#splitline{cos(#alpha) __ sin(#alpha)}{-sin(#alpha) __ cos(#alpha)}}; X=(y z); C_{X}=#(){#splitline{Var(y) 0}{0 Var(z)}}
633 // using simple trigonometrics one can write for this last case
635 // 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})}}
637 // which can be aproximated for small alphas (2 deg) with
639 // 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}}}
642 // before applying the tilt rotation we also apply systematic uncertainties to the tracklet
643 // position which can be tunned from outside via the AliTRDrecoParam::SetSysCovMatrix(). They might
644 // account for extra misalignment/miscalibration uncertainties.
647 // Alex Bercuci <A.Bercuci@gsi.de>
648 // Date : Jan 8th 2009
653 Double_t sy2 = fCov[0] +2.*xr*fCov[1] + xr*xr*fCov[2];
655 //GetPadLength()*GetPadLength()/12.;
657 // insert systematic uncertainties
659 Double_t sys[15]; memset(sys, 0, 15*sizeof(Double_t));
660 fReconstructor->GetRecoParam()->GetSysCovMatrix(sys);
664 // rotate covariance matrix
665 Double_t t2 = GetTilt()*GetTilt();
666 Double_t correction = 1./(1. + t2);
667 cov[0] = (sy2+t2*sz2)*correction;
668 cov[1] = GetTilt()*(sz2 - sy2)*correction;
669 cov[2] = (t2*sy2+sz2)*correction;
671 //printf("C(%6.1f %+6.3f %6.1f) [%s]\n", 1.e4*TMath::Sqrt(cov[0]), cov[1], 1.e4*TMath::Sqrt(cov[2]), IsRowCross()?" RC ":"-");
674 //____________________________________________________________
675 Double_t AliTRDseedV1::GetCovSqrt(Double_t *c, Double_t *d)
677 // Helper function to calculate the square root of the covariance matrix.
678 // The input matrix is stored in the vector c and the result in the vector d.
679 // Both arrays have to be initialized by the user with at least 3 elements. Return negative in case of failure.
681 // For calculating the square root of the symmetric matrix c
682 // the following relation is used:
684 // C^{1/2} = VD^{1/2}V^{-1}
686 // with V being the matrix with the n eigenvectors as columns.
687 // In case C is symmetric the followings are true:
688 // - matrix D is diagonal with the diagonal given by the eigenvalues of C
691 // Author A.Bercuci <A.Bercuci@gsi.de>
694 Double_t L[2], // eigenvalues
695 V[3]; // eigenvectors
696 // the secular equation and its solution :
697 // (c[0]-L)(c[2]-L)-c[1]^2 = 0
698 // L^2 - L*Tr(c)+DET(c) = 0
699 // L12 = [Tr(c) +- sqrt(Tr(c)^2-4*DET(c))]/2
700 Double_t Tr = c[0]+c[2], // trace
701 DET = c[0]*c[2]-c[1]*c[1]; // determinant
702 if(TMath::Abs(DET)<1.e-20) return -1.;
703 Double_t DD = TMath::Sqrt(Tr*Tr - 4*DET);
706 if(L[0]<0. || L[1]<0.) return -1.;
711 Double_t tmp = (L[0]-c[0])/c[1];
712 V[0] = TMath::Sqrt(1./(tmp*tmp+1));
714 V[2] = V[1]*c[1]/(L[1]-c[2]);
716 L[0] = TMath::Sqrt(L[0]); L[1] = TMath::Sqrt(L[1]);
717 d[0] = V[0]*V[0]*L[0]+V[1]*V[1]*L[1];
718 d[1] = V[0]*V[1]*L[0]+V[1]*V[2]*L[1];
719 d[2] = V[1]*V[1]*L[0]+V[2]*V[2]*L[1];
724 //____________________________________________________________
725 Double_t AliTRDseedV1::GetCovInv(Double_t *c, Double_t *d)
727 // Helper function to calculate the inverse of the covariance matrix.
728 // The input matrix is stored in the vector c and the result in the vector d.
729 // Both arrays have to be initialized by the user with at least 3 elements
730 // The return value is the determinant or 0 in case of singularity.
732 // Author A.Bercuci <A.Bercuci@gsi.de>
735 Double_t Det = c[0]*c[2] - c[1]*c[1];
736 if(TMath::Abs(Det)<1.e-20) return 0.;
737 Double_t InvDet = 1./Det;
744 //____________________________________________________________________
745 UShort_t AliTRDseedV1::GetVolumeId() const
748 while(ic<kNclusters && !fClusters[ic]) ic++;
749 return fClusters[ic] ? fClusters[ic]->GetVolumeId() : 0;
753 //____________________________________________________________________
754 void AliTRDseedV1::Calibrate()
756 // Retrieve calibration and position parameters from OCDB.
757 // The following information are used
759 // - column and row position of first attached cluster. If no clusters are attached
760 // to the tracklet a random central chamber position (c=70, r=7) will be used.
762 // The following information is cached in the tracklet
763 // t0 (trigger delay)
766 // omega*tau = tg(a_L)
767 // diffusion coefficients (longitudinal and transversal)
770 // Alex Bercuci <A.Bercuci@gsi.de>
771 // Date : Jan 8th 2009
774 AliCDBManager *cdb = AliCDBManager::Instance();
775 if(cdb->GetRun() < 0){
776 AliError("OCDB manager not properly initialized");
780 AliTRDcalibDB *calib = AliTRDcalibDB::Instance();
781 AliTRDCalROC *vdROC = calib->GetVdriftROC(fDet),
782 *t0ROC = calib->GetT0ROC(fDet);;
783 const AliTRDCalDet *vdDet = calib->GetVdriftDet();
784 const AliTRDCalDet *t0Det = calib->GetT0Det();
786 Int_t col = 70, row = 7;
787 AliTRDcluster **c = &fClusters[0];
790 while (ic<kNclusters && !(*c)){ic++; c++;}
792 col = (*c)->GetPadCol();
793 row = (*c)->GetPadRow();
797 fT0 = t0Det->GetValue(fDet) + t0ROC->GetValue(col,row);
798 fVD = vdDet->GetValue(fDet) * vdROC->GetValue(col, row);
799 fS2PRF = calib->GetPRFWidth(fDet, col, row); fS2PRF *= fS2PRF;
800 fExB = AliTRDCommonParam::Instance()->GetOmegaTau(fVD);
801 AliTRDCommonParam::Instance()->GetDiffCoeff(fDiffL,
803 SetBit(kCalib, kTRUE);
806 //____________________________________________________________________
807 void AliTRDseedV1::SetOwner()
809 //AliInfo(Form("own [%s] fOwner[%s]", own?"YES":"NO", fOwner?"YES":"NO"));
811 if(TestBit(kOwner)) return;
812 for(int ic=0; ic<kNclusters; ic++){
813 if(!fClusters[ic]) continue;
814 fClusters[ic] = new AliTRDcluster(*fClusters[ic]);
819 //____________________________________________________________
820 void AliTRDseedV1::SetPadPlane(AliTRDpadPlane *p)
822 // Shortcut method to initialize pad geometry.
824 SetTilt(TMath::Tan(TMath::DegToRad()*p->GetTiltingAngle()));
825 SetPadLength(p->GetLengthIPad());
826 SetPadWidth(p->GetWidthIPad());
830 //____________________________________________________________________
831 Bool_t AliTRDseedV1::AttachClusters(AliTRDtrackingChamber *chamber, Bool_t tilt)
834 // Projective algorithm to attach clusters to seeding tracklets
840 // Detailed description
841 // 1. Collapse x coordinate for the full detector plane
842 // 2. truncated mean on y (r-phi) direction
844 // 4. truncated mean on z direction
848 Bool_t kPRINT = kFALSE;
849 if(!fReconstructor->GetRecoParam() ){
850 AliError("Seed can not be used without a valid RecoParam.");
853 // Initialize reco params for this tracklet
854 // 1. first time bin in the drift region
856 Int_t kClmin = Int_t(fReconstructor->GetRecoParam() ->GetFindableClusters()*AliTRDtrackerV1::GetNTimeBins());
858 Double_t syRef = TMath::Sqrt(fRefCov[0]);
860 Double_t kroady = 1.;
861 //fReconstructor->GetRecoParam() ->GetRoad1y();
862 Double_t kroadz = GetPadLength() * 1.5 + 1.;
863 if(kPRINT) printf("AttachClusters() sy[%f] road[%f]\n", syRef, kroady);
866 const Int_t kNrows = 16;
867 AliTRDcluster *clst[kNrows][kNclusters];
868 Double_t cond[4], dx, dy, yt, zt,
869 yres[kNrows][kNclusters];
870 Int_t idxs[kNrows][kNclusters], ncl[kNrows], ncls = 0;
871 memset(ncl, 0, kNrows*sizeof(Int_t));
872 memset(clst, 0, kNrows*kNclusters*sizeof(AliTRDcluster*));
874 // Do cluster projection
875 AliTRDcluster *c = 0x0;
876 AliTRDchamberTimeBin *layer = 0x0;
877 Bool_t kBUFFER = kFALSE;
878 for (Int_t it = 0; it < AliTRDtrackerV1::GetNTimeBins(); it++) {
879 if(!(layer = chamber->GetTB(it))) continue;
880 if(!Int_t(*layer)) continue;
882 dx = fX0 - layer->GetX();
883 yt = fYref[0] - fYref[1] * dx;
884 zt = fZref[0] - fZref[1] * dx;
885 if(kPRINT) printf("\t%2d dx[%f] yt[%f] zt[%f]\n", it, dx, yt, zt);
887 // select clusters on a 5 sigmaKalman level
888 cond[0] = yt; cond[2] = kroady;
889 cond[1] = zt; cond[3] = kroadz;
891 layer->GetClusters(cond, idx, n, 6);
892 for(Int_t ic = n; ic--;){
893 c = (*layer)[idx[ic]];
895 dy += tilt ? GetTilt() * (c->GetZ() - zt) : 0.;
896 // select clusters on a 3 sigmaKalman level
897 /* if(tilt && TMath::Abs(dy) > 3.*syRef){
898 printf("too large !!!\n");
901 Int_t r = c->GetPadRow();
902 if(kPRINT) printf("\t\t%d dy[%f] yc[%f] r[%d]\n", ic, TMath::Abs(dy), c->GetY(), r);
904 idxs[r][ncl[r]] = idx[ic];
905 yres[r][ncl[r]] = dy;
908 if(ncl[r] >= kNclusters) {
909 AliWarning(Form("Cluster candidates reached limit %d. Some may be lost.", kNclusters));
916 if(kPRINT) printf("Found %d clusters\n", ncls);
917 if(ncls<kClmin) return kFALSE;
919 // analyze each row individualy
920 Double_t mean, syDis;
921 Int_t nrow[] = {0, 0, 0}, nr = 0, lr=-1;
922 for(Int_t ir=kNrows; ir--;){
923 if(!(ncl[ir])) continue;
924 if(lr>0 && lr-ir != 1){
925 if(kPRINT) printf("W - gap in rows attached !!\n");
927 if(kPRINT) printf("\tir[%d] lr[%d] n[%d]\n", ir, lr, ncl[ir]);
928 // Evaluate truncated mean on the y direction
929 if(ncl[ir] > 3) AliMathBase::EvaluateUni(ncl[ir], yres[ir], mean, syDis, Int_t(ncl[ir]*.8));
931 mean = 0.; syDis = 0.;
934 // TODO check mean and sigma agains cluster resolution !!
935 if(kPRINT) printf("\tr[%2d] m[%f %5.3fsigma] s[%f]\n", ir, mean, TMath::Abs(mean/syRef), syDis);
936 // select clusters on a 3 sigmaDistr level
937 Bool_t kFOUND = kFALSE;
938 for(Int_t ic = ncl[ir]; ic--;){
939 if(yres[ir][ic] - mean > 3. * syDis){
940 clst[ir][ic] = 0x0; continue;
942 nrow[nr]++; kFOUND = kTRUE;
946 lr = ir; if(nr>=3) break;
948 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]);
950 // classify cluster rows
957 SetBit(kRowCross, kTRUE); // mark pad row crossing
958 if(nrow[0] > nrow[1]){ row = lr+1; lr = -1;}
967 SetBit(kRowCross, kTRUE); // mark pad row crossing
970 if(kPRINT) printf("\trow[%d] n[%d]\n\n", row, nrow[0]);
971 if(row<0) return kFALSE;
973 // Select and store clusters
974 // We should consider here :
975 // 1. How far is the chamber boundary
976 // 2. How big is the mean
978 for (Int_t ir = 0; ir < nr; ir++) {
979 Int_t jr = row + ir*lr;
980 if(kPRINT) printf("\tattach %d clusters for row %d\n", ncl[jr], jr);
981 for (Int_t ic = 0; ic < ncl[jr]; ic++) {
982 if(!(c = clst[jr][ic])) continue;
983 Int_t it = c->GetPadTime();
984 // TODO proper indexing of clusters !!
985 fIndexes[it+kNtb*ir] = chamber->GetTB(it)->GetGlobalIndex(idxs[jr][ic]);
986 fClusters[it+kNtb*ir] = c;
988 //printf("\tid[%2d] it[%d] idx[%d]\n", ic, it, fIndexes[it]);
994 // number of minimum numbers of clusters expected for the tracklet
996 //AliWarning(Form("Not enough clusters to fit the tracklet %d [%d].", n, kClmin));
1001 // Load calibration parameters for this tracklet
1004 // calculate dx for time bins in the drift region (calibration aware)
1005 Float_t x[2] = {0.,0.}; Int_t tb[2]={0,0};
1006 for (Int_t it = t0, irp=0; irp<2 && it < AliTRDtrackerV1::GetNTimeBins(); it++) {
1007 if(!fClusters[it]) continue;
1008 x[irp] = fClusters[it]->GetX();
1009 tb[irp] = fClusters[it]->GetLocalTimeBin();
1010 printf(" x[%d]=%f t[%d]=%d\n", irp, x[irp], irp, tb[irp]);
1013 Int_t dtb = tb[1] - tb[0];
1014 fdX = dtb ? (x[0] - x[1]) / dtb : 0.15;
1019 //____________________________________________________________
1020 void AliTRDseedV1::Bootstrap(const AliTRDReconstructor *rec)
1022 // Fill in all derived information. It has to be called after recovery from file or HLT.
1023 // The primitive data are
1024 // - list of clusters
1025 // - detector (as the detector will be removed from clusters)
1026 // - position of anode wire (fX0) - temporary
1027 // - track reference position and direction
1028 // - momentum of the track
1029 // - time bin length [cm]
1031 // A.Bercuci <A.Bercuci@gsi.de> Oct 30th 2008
1033 fReconstructor = rec;
1035 AliTRDpadPlane *pp = g.GetPadPlane(fDet);
1036 fPad[0] = pp->GetLengthIPad();
1037 fPad[1] = pp->GetWidthIPad();
1038 fPad[3] = TMath::Tan(TMath::DegToRad()*pp->GetTiltingAngle());
1039 //fSnp = fYref[1]/TMath::Sqrt(1+fYref[1]*fYref[1]);
1041 Int_t n = 0, nshare = 0, nused = 0;
1042 AliTRDcluster **cit = &fClusters[0];
1043 for(Int_t ic = kNclusters; ic--; cit++){
1046 if((*cit)->IsShared()) nshare++;
1047 if((*cit)->IsUsed()) nused++;
1049 SetN(n); SetNUsed(nused); SetNShared(nshare);
1056 //____________________________________________________________________
1057 Bool_t AliTRDseedV1::Fit(Bool_t tilt, Bool_t zcorr)
1060 // Linear fit of the clusters attached to the tracklet
1063 // - tilt : switch for tilt pad correction of cluster y position based on
1064 // the z, dzdx info from outside [default false].
1065 // - zcorr : switch for using z information to correct for anisochronity
1066 // and a finner error parametrization estimation [default false]
1068 // True if successful
1070 // Detailed description
1072 // Fit in the xy plane
1076 if(!IsCalibrated()) Calibrate();
1078 const Int_t kClmin = 8;
1081 // cluster error parametrization parameters
1082 // 1. sy total charge
1083 const Float_t sq0inv = 0.019962; // [1/q0]
1084 const Float_t sqb = 1.0281564; //[cm]
1085 // 2. sy for the PRF
1086 const Float_t scy[AliTRDgeometry::kNlayer][4] = {
1087 {2.827e-02, 9.600e-04, 4.296e-01, 2.271e-02},
1088 {2.952e-02,-2.198e-04, 4.146e-01, 2.339e-02},
1089 {3.090e-02, 1.514e-03, 4.020e-01, 2.402e-02},
1090 {3.260e-02,-2.037e-03, 3.946e-01, 2.509e-02},
1091 {3.439e-02,-3.601e-04, 3.883e-01, 2.623e-02},
1092 {3.510e-02, 2.066e-03, 3.651e-01, 2.588e-02},
1095 // get track direction
1096 Double_t y0 = fYref[0];
1097 Double_t dydx = fYref[1];
1098 Double_t z0 = fZref[0];
1099 Double_t dzdx = fZref[1];
1102 // calculation of tg^2(phi - a_L) and tg^2(a_L)
1103 Double_t tgg = (dydx-fExB)/(1.+dydx*fExB); tgg *= tgg;
1104 //Double_t exb2= fExB*fExB;
1106 //AliTRDtrackerV1::AliTRDLeastSquare fitterZ;
1107 TLinearFitter fitterY(1, "pol1");
1108 TLinearFitter fitterZ(1, "pol1");
1110 // book cluster information
1111 Double_t qc[kNclusters], xc[kNclusters], yc[kNclusters], zc[kNclusters], sy[kNclusters];
1113 Int_t ily = AliTRDgeometry::GetLayer(fDet);
1115 AliTRDcluster *c=0x0, **jc = &fClusters[0];
1116 for (Int_t ic=0; ic<kNtb; ic++, ++jc) {
1122 if(!(c = (*jc))) continue;
1123 if(!c->IsInChamber()) continue;
1126 if(c->GetNPads()>4) w = .5;
1127 if(c->GetNPads()>5) w = .2;
1128 Int_t tb = c->GetLocalTimeBin();
1130 qc[n] = TMath::Abs(c->GetQ());
1131 // Radial cluster position
1132 //Int_t jc = TMath::Max(fN-3, 0);
1133 //xc[fN] = c->GetXloc(fT0, fVD, &qc[jc], &xc[jc]/*, z0 - c->GetX()*dzdx*/);
1134 xc[n] = fX0 - c->GetX();
1136 //Double_t s2 = fS2PRF + fDiffL*fDiffL*xc[n]/(1.+2.*exb2)+tgg*xc[n]*xc[n]*exb2/12.;
1137 //yc[fN] = c->GetYloc(s2, GetPadWidth(), xc[fN], fExB);
1138 yc[n] = c->GetY()-AliTRDcluster::GetYcorr(ily, c->GetCenter());
1141 // extrapolated y value for the track
1142 yt = y0 - xc[n]*dydx;
1143 // extrapolated z value for the track
1144 zt = z0 - xc[n]*dzdx;
1146 if(tilt) yc[n] -= GetTilt()*(zc[n] - zt);
1148 // ELABORATE CLUSTER ERROR
1149 // basic y error (|| to track).
1150 sy[n] = AliTRDcluster::GetSY(tb, zcorr?zt:-1.);
1151 //printf("cluster[%d]\n\tsy[0] = %5.3e [um]\n", fN, sy[fN]*1.e4);
1152 // y error due to total charge
1153 sy[n] += sqb*(1./qc[n] - sq0inv);
1154 //printf("\tsy[1] = %5.3e [um]\n", sy[fN]*1.e4);
1155 // y error due to PRF
1156 sy[n] += scy[ily][0]*TMath::Gaus(c->GetCenter(), scy[ily][1], scy[ily][2]) - scy[ily][3];
1157 //printf("\tsy[2] = %5.3e [um]\n", sy[fN]*1.e4);
1162 // error of drift length parallel to the track
1163 Double_t sx = AliTRDcluster::GetSX(tb, zcorr?zt:-1.); // [cm]
1164 //printf("\tsx[0] = %5.3e [um]\n", sx*1.e4);
1165 sx *= sx; // square sx
1167 // add error from ExB
1168 sy[n] += fExB*fExB*sx;
1169 //printf("\tsy[3] = %5.3e [um^2]\n", sy[fN]*1.e8);
1171 // global radial error due to misalignment/miscalibration
1172 Double_t sx0 = 0.; sx0 *= sx0;
1173 // add sx contribution to sy due to track angle
1174 sy[n] += tgg*(sx+sx0);
1175 // TODO we should add tilt pad correction here
1176 //printf("\tsy[4] = %5.3e [um^2]\n", sy[fN]*1.e8);
1177 c->SetSigmaY2(sy[n]);
1179 sy[n] = TMath::Sqrt(sy[n]);
1180 fitterY.AddPoint(&xc[n], yc[n], sy[n]);
1181 fitterZ.AddPoint(&xc[n], qc[n], 1.);
1185 if (n < kClmin) return kFALSE;
1189 fYfit[0] = fitterY.GetParameter(0);
1190 fYfit[1] = -fitterY.GetParameter(1);
1192 Double_t *p = fitterY.GetCovarianceMatrix();
1193 fCov[0] = p[0]; // variance of y0
1194 fCov[1] = p[1]; // covariance of y0, dydx
1195 fCov[2] = p[3]; // variance of dydx
1196 // the ref radial position is set at the minimum of
1197 // the y variance of the tracklet
1198 fX = -fCov[1]/fCov[2];
1202 Int_t ic=n=kNclusters-1; jc = &fClusters[ic];
1203 for(; ic>kNtb; ic--, --jc){
1204 if(!(c = (*jc))) continue;
1205 if(!c->IsInChamber()) continue;
1206 qc[n] = TMath::Abs(c->GetQ());
1207 xc[n] = fX0 - c->GetX();
1209 fitterZ.AddPoint(&xc[n], -qc[n], 1.);
1214 if(fitterZ.GetParameter(1)!=0.){
1215 fX = -fitterZ.GetParameter(0)/fitterZ.GetParameter(1);
1217 Float_t dl = .5*AliTRDgeometry::CamHght()+AliTRDgeometry::CdrHght();
1219 fX-=.055; // TODO to be understood
1222 fZfit[0] = .5*(zc[0]+zc[kNclusters-1]); fZfit[1] = 0.;
1223 // temporary external error parameterization
1224 fS2Z = 0.05+0.4*TMath::Abs(fZref[1]); fS2Z *= fS2Z;
1225 // TODO correct formula
1226 //fS2Z = sigma_x*TMath::Abs(fZref[1]);
1228 fZfit[0] = zc[0]; fZfit[1] = 0.;
1229 fS2Z = GetPadLength()*GetPadLength()/12.;
1231 fS2Y = fCov[0] +2.*fX*fCov[1] + fX*fX*fCov[2];
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];
1276 //_____________________________________________________________________________
1277 void AliTRDseedV1::FitMI()
1281 // Marian Ivanov's version
1283 // linear fit on the y direction with respect to the reference direction.
1284 // The residuals for each x (x = xc - x0) are deduced from:
1286 // the tilting correction is written :
1287 // y = yc + h*(zc-zt) (2)
1288 // yt = y0+dy/dx*x (3)
1289 // zt = z0+dz/dx*x (4)
1290 // from (1),(2),(3) and (4)
1291 // dy = yc - y0 - (dy/dx + h*dz/dx)*x + h*(zc-z0)
1292 // the last term introduces the correction on y direction due to tilting pads. There are 2 ways to account for this:
1293 // 1. use tilting correction for calculating the y
1294 // 2. neglect tilting correction here and account for it in the error parametrization of the tracklet.
1295 const Float_t kRatio = 0.8;
1296 const Int_t kClmin = 5;
1297 const Float_t kmaxtan = 2;
1299 if (TMath::Abs(fYref[1]) > kmaxtan){
1300 //printf("Exit: Abs(fYref[1]) = %3.3f, kmaxtan = %3.3f\n", TMath::Abs(fYref[1]), kmaxtan);
1301 return; // Track inclined too much
1304 Float_t sigmaexp = 0.05 + TMath::Abs(fYref[1] * 0.25); // Expected r.m.s in y direction
1305 Float_t ycrosscor = GetPadLength() * GetTilt() * 0.5; // Y correction for crossing
1316 // Buffering: Leave it constant fot Performance issues
1317 Int_t zints[kNtb]; // Histograming of the z coordinate
1318 // Get 1 and second max probable coodinates in z
1319 Int_t zouts[2*kNtb];
1320 Float_t allowedz[kNtb]; // Allowed z for given time bin
1321 Float_t yres[kNtb]; // Residuals from reference
1322 //Float_t anglecor = GetTilt() * fZref[1]; // Correction to the angle
1324 Float_t pos[3*kNtb]; memset(pos, 0, 3*kNtb*sizeof(Float_t));
1325 Float_t *fX = &pos[0], *fY = &pos[kNtb], *fZ = &pos[2*kNtb];
1327 Int_t fN = 0; AliTRDcluster *c = 0x0;
1329 for (Int_t i = 0; i < AliTRDtrackerV1::GetNTimeBins(); i++) {
1331 if (!(c = fClusters[i])) continue;
1332 if(!c->IsInChamber()) continue;
1334 //yres[i] = fY[i] - fYref[0] - (fYref[1] + anglecor) * fX[i] + GetTilt()*(fZ[i] - fZref[0]);
1335 fX[i] = fX0 - c->GetX();
1338 yres[i] = fY[i] - GetTilt()*(fZ[i] - (fZref[0] - fX[i]*fZref[1]));
1339 zints[fN] = Int_t(fZ[i]);
1344 //printf("Exit fN < kClmin: fN = %d\n", fN);
1347 Int_t nz = AliTRDtrackerV1::Freq(fN, zints, zouts, kFALSE);
1348 Float_t fZProb = zouts[0];
1349 if (nz <= 1) zouts[3] = 0;
1350 if (zouts[1] + zouts[3] < kClmin) {
1351 //printf("Exit zouts[1] = %d, zouts[3] = %d\n",zouts[1],zouts[3]);
1355 // Z distance bigger than pad - length
1356 if (TMath::Abs(zouts[0]-zouts[2]) > 12.0) zouts[3] = 0;
1358 Int_t breaktime = -1;
1359 Bool_t mbefore = kFALSE;
1360 Int_t cumul[kNtb][2];
1361 Int_t counts[2] = { 0, 0 };
1363 if (zouts[3] >= 3) {
1366 // Find the break time allowing one chage on pad-rows
1367 // with maximal number of accepted clusters
1370 for (Int_t i = 0; i < AliTRDtrackerV1::GetNTimeBins(); i++) {
1371 cumul[i][0] = counts[0];
1372 cumul[i][1] = counts[1];
1373 if (TMath::Abs(fZ[i]-zouts[0]) < 2) counts[0]++;
1374 if (TMath::Abs(fZ[i]-zouts[2]) < 2) counts[1]++;
1377 for (Int_t i = 0; i < AliTRDtrackerV1::GetNTimeBins(); i++) {
1378 Int_t after = cumul[AliTRDtrackerV1::GetNTimeBins()][0] - cumul[i][0];
1379 Int_t before = cumul[i][1];
1380 if (after + before > maxcount) {
1381 maxcount = after + before;
1385 after = cumul[AliTRDtrackerV1::GetNTimeBins()-1][1] - cumul[i][1];
1386 before = cumul[i][0];
1387 if (after + before > maxcount) {
1388 maxcount = after + before;
1396 for (Int_t i = 0; i < AliTRDtrackerV1::GetNTimeBins()+1; i++) {
1397 if (i > breaktime) allowedz[i] = mbefore ? zouts[2] : zouts[0];
1398 if (i <= breaktime) allowedz[i] = (!mbefore) ? zouts[2] : zouts[0];
1401 if (((allowedz[0] > allowedz[AliTRDtrackerV1::GetNTimeBins()]) && (fZref[1] < 0)) ||
1402 ((allowedz[0] < allowedz[AliTRDtrackerV1::GetNTimeBins()]) && (fZref[1] > 0))) {
1404 // Tracklet z-direction not in correspondance with track z direction
1407 for (Int_t i = 0; i < AliTRDtrackerV1::GetNTimeBins()+1; i++) {
1408 allowedz[i] = zouts[0]; // Only longest taken
1414 // Cross pad -row tracklet - take the step change into account
1416 for (Int_t i = 0; i < AliTRDtrackerV1::GetNTimeBins()+1; i++) {
1417 if (!fClusters[i]) continue;
1418 if(!fClusters[i]->IsInChamber()) continue;
1419 if (TMath::Abs(fZ[i] - allowedz[i]) > 2) continue;
1421 //yres[i] = fY[i] - fYref[0] - (fYref[1] + anglecor) * fX[i] + GetTilt()*(fZ[i] - fZref[0]);
1422 yres[i] = fY[i] - GetTilt()*(fZ[i] - (fZref[0] - fX[i]*fZref[1]));
1423 // if (TMath::Abs(fZ[i] - fZProb) > 2) {
1424 // if (fZ[i] > fZProb) yres[i] += GetTilt() * GetPadLength();
1425 // if (fZ[i] < fZProb) yres[i] -= GetTilt() * GetPadLength();
1430 Double_t yres2[kNtb];
1433 for (Int_t i = 0; i < AliTRDtrackerV1::GetNTimeBins()+1; i++) {
1434 if (!fClusters[i]) continue;
1435 if(!fClusters[i]->IsInChamber()) continue;
1436 if (TMath::Abs(fZ[i] - allowedz[i]) > 2) continue;
1437 yres2[fN2] = yres[i];
1441 //printf("Exit fN2 < kClmin: fN2 = %d\n", fN2);
1445 AliMathBase::EvaluateUni(fN2,yres2,mean,sigma, Int_t(fN2*kRatio-2.));
1446 if (sigma < sigmaexp * 0.8) {
1449 //Float_t fSigmaY = sigma;
1464 for (Int_t i = 0; i < AliTRDtrackerV1::GetNTimeBins()+1; i++) {
1465 if (!fClusters[i]) continue;
1466 if (!fClusters[i]->IsInChamber()) continue;
1467 if (TMath::Abs(fZ[i] - allowedz[i]) > 2){fClusters[i] = 0x0; continue;}
1468 if (TMath::Abs(yres[i] - mean) > 4.0 * sigma){fClusters[i] = 0x0; continue;}
1471 fMPads += fClusters[i]->GetNPads();
1472 Float_t weight = 1.0;
1473 if (fClusters[i]->GetNPads() > 4) weight = 0.5;
1474 if (fClusters[i]->GetNPads() > 5) weight = 0.2;
1478 //printf("x = %7.3f dy = %7.3f fit %7.3f\n", x, yres[i], fY[i]-yres[i]);
1481 sumwx += x * weight;
1482 sumwx2 += x*x * weight;
1483 sumwy += weight * yres[i];
1484 sumwxy += weight * (yres[i]) * x;
1485 sumwz += weight * fZ[i];
1486 sumwxz += weight * fZ[i] * x;
1491 //printf("Exit fN2 < kClmin(2): fN2 = %d\n",fN2);
1495 fMeanz = sumwz / sumw;
1496 Float_t correction = 0;
1498 // Tracklet on boundary
1499 if (fMeanz < fZProb) correction = ycrosscor;
1500 if (fMeanz > fZProb) correction = -ycrosscor;
1503 Double_t det = sumw * sumwx2 - sumwx * sumwx;
1504 fYfit[0] = (sumwx2 * sumwy - sumwx * sumwxy) / det;
1505 fYfit[1] = (sumw * sumwxy - sumwx * sumwy) / det;
1508 for (Int_t i = 0; i < AliTRDtrackerV1::GetNTimeBins()+1; i++) {
1509 if (!TESTBIT(fUsable,i)) continue;
1510 Float_t delta = yres[i] - fYfit[0] - fYfit[1] * fX[i];
1511 fS2Y += delta*delta;
1513 fS2Y = TMath::Sqrt(fS2Y / Float_t(fN2-2));
1514 // TEMPORARY UNTIL covariance properly calculated
1515 fS2Y = TMath::Max(fS2Y, Float_t(.1));
1517 fZfit[0] = (sumwx2 * sumwz - sumwx * sumwxz) / det;
1518 fZfit[1] = (sumw * sumwxz - sumwx * sumwz) / det;
1519 // fYfitR[0] += fYref[0] + correction;
1520 // fYfitR[1] += fYref[1];
1521 // fYfit[0] = fYfitR[0];
1522 fYfit[1] = -fYfit[1];
1527 //___________________________________________________________________
1528 void AliTRDseedV1::Print(Option_t *o) const
1531 // Printing the seedstatus
1534 AliInfo(Form("Det[%3d] X0[%7.2f] Pad{L[%5.2f] W[%5.2f] Tilt[%+6.2f]}", fDet, fX0, GetPadLength(), GetPadWidth(), GetTilt()));
1535 AliInfo(Form("N[%2d] Nused[%2d] Nshared[%2d] [%d]", GetN(), GetNUsed(), GetNShared(), fN));
1536 AliInfo(Form("FLAGS : RC[%c] Kink[%c] SA[%c]", IsRowCross()?'y':'n', IsKink()?'y':'n', IsStandAlone()?'y':'n'));
1538 Double_t cov[3], x=GetX();
1540 AliInfo(" | x[cm] | y[cm] | z[cm] | dydx | dzdx |");
1541 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]));
1542 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[0]), fZref[0]-fX*fYref[1], TMath::Sqrt(fRefCov[2]), fYref[1], fZref[1]))
1545 if(strcmp(o, "a")!=0) return;
1547 AliTRDcluster* const* jc = &fClusters[0];
1548 for(int ic=0; ic<kNclusters; ic++, jc++) {
1549 if(!(*jc)) continue;
1555 //___________________________________________________________________
1556 Bool_t AliTRDseedV1::IsEqual(const TObject *o) const
1558 // Checks if current instance of the class has the same essential members
1561 if(!o) return kFALSE;
1562 const AliTRDseedV1 *inTracklet = dynamic_cast<const AliTRDseedV1*>(o);
1563 if(!inTracklet) return kFALSE;
1565 for (Int_t i = 0; i < 2; i++){
1566 if ( fYref[i] != inTracklet->fYref[i] ) return kFALSE;
1567 if ( fZref[i] != inTracklet->fZref[i] ) return kFALSE;
1570 if ( fS2Y != inTracklet->fS2Y ) return kFALSE;
1571 if ( GetTilt() != inTracklet->GetTilt() ) return kFALSE;
1572 if ( GetPadLength() != inTracklet->GetPadLength() ) return kFALSE;
1574 for (Int_t i = 0; i < kNclusters; i++){
1575 // if ( fX[i] != inTracklet->GetX(i) ) return kFALSE;
1576 // if ( fY[i] != inTracklet->GetY(i) ) return kFALSE;
1577 // if ( fZ[i] != inTracklet->GetZ(i) ) return kFALSE;
1578 if ( fIndexes[i] != inTracklet->fIndexes[i] ) return kFALSE;
1580 // if ( fUsable != inTracklet->fUsable ) return kFALSE;
1582 for (Int_t i=0; i < 2; i++){
1583 if ( fYfit[i] != inTracklet->fYfit[i] ) return kFALSE;
1584 if ( fZfit[i] != inTracklet->fZfit[i] ) return kFALSE;
1585 if ( fLabels[i] != inTracklet->fLabels[i] ) return kFALSE;
1588 /* if ( fMeanz != inTracklet->GetMeanz() ) return kFALSE;
1589 if ( fZProb != inTracklet->GetZProb() ) return kFALSE;*/
1590 if ( fN != inTracklet->fN ) return kFALSE;
1591 //if ( fNUsed != inTracklet->fNUsed ) return kFALSE;
1592 //if ( fFreq != inTracklet->GetFreq() ) return kFALSE;
1593 //if ( fNChange != inTracklet->GetNChange() ) return kFALSE;
1595 if ( fC != inTracklet->fC ) return kFALSE;
1596 //if ( fCC != inTracklet->GetCC() ) return kFALSE;
1597 if ( fChi2 != inTracklet->fChi2 ) return kFALSE;
1598 // if ( fChi2Z != inTracklet->GetChi2Z() ) return kFALSE;
1600 if ( fDet != inTracklet->fDet ) return kFALSE;
1601 if ( fPt != inTracklet->fPt ) return kFALSE;
1602 if ( fdX != inTracklet->fdX ) return kFALSE;
1604 for (Int_t iCluster = 0; iCluster < kNclusters; iCluster++){
1605 AliTRDcluster *curCluster = fClusters[iCluster];
1606 AliTRDcluster *inCluster = inTracklet->fClusters[iCluster];
1607 if (curCluster && inCluster){
1608 if (! curCluster->IsEqual(inCluster) ) {
1609 curCluster->Print();
1614 // if one cluster exists, and corresponding
1615 // in other tracklet doesn't - return kFALSE
1616 if(curCluster || inCluster) return kFALSE;