X-Git-Url: http://git.uio.no/git/?a=blobdiff_plain;f=TRD%2FAliTRDseedV1.cxx;h=a15737840281a4351024fec1fe0b44c0d0db201b;hb=b5627c6ba7491960ea2372cdf3d46136e15b56ae;hp=43792bc2278996ce31e336f708ab6c64eb71a164;hpb=35c248141166b5ed1ba0d67c0c30c3dbddef572e;p=u%2Fmrichter%2FAliRoot.git diff --git a/TRD/AliTRDseedV1.cxx b/TRD/AliTRDseedV1.cxx index 43792bc2278..a1573784028 100644 --- a/TRD/AliTRDseedV1.cxx +++ b/TRD/AliTRDseedV1.cxx @@ -16,9 +16,19 @@ /* $Id$ */ //////////////////////////////////////////////////////////////////////////// -// // -// The TRD track seed // -// // +//// +// The TRD offline tracklet +// +// The running horse of the TRD reconstruction. The following tasks are preformed: +// 1. Clusters attachment to tracks based on prior information stored at tracklet level (see AttachClusters) +// 2. Clusters position recalculation based on track information (see GetClusterXY and Fit) +// 3. Cluster error parametrization recalculation (see Fit) +// 4. Linear track approximation (Fit) +// 5. Optimal position (including z estimate for pad row cross tracklets) and covariance matrix of the track fit inside one TRD chamber (Fit) +// 6. Tilt pad correction and systematic effects (GetCovAt) +// 7. dEdx calculation (CookdEdx) +// 8. PID probabilities estimation (CookPID) +// // Authors: // // Alex Bercuci // // Markus Fasel // @@ -26,13 +36,17 @@ //////////////////////////////////////////////////////////////////////////// #include "TMath.h" -#include "TLinearFitter.h" -#include "TClonesArray.h" // tmp -#include +#include "TTreeStream.h" +#include "TGraphErrors.h" #include "AliLog.h" #include "AliMathBase.h" +#include "AliRieman.h" +#include "AliCDBManager.h" +#include "AliTRDReconstructor.h" +#include "AliTRDpadPlane.h" +#include "AliTRDtransform.h" #include "AliTRDcluster.h" #include "AliTRDseedV1.h" #include "AliTRDtrackV1.h" @@ -40,53 +54,100 @@ #include "AliTRDchamberTimeBin.h" #include "AliTRDtrackingChamber.h" #include "AliTRDtrackerV1.h" -#include "AliTRDReconstructor.h" #include "AliTRDrecoParam.h" +#include "AliTRDCommonParam.h" +#include "AliTRDtrackletOflHelper.h" + +#include "Cal/AliTRDCalTrkAttach.h" #include "Cal/AliTRDCalPID.h" +#include "Cal/AliTRDCalROC.h" +#include "Cal/AliTRDCalDet.h" + +class AliTracker; ClassImp(AliTRDseedV1) //____________________________________________________________________ AliTRDseedV1::AliTRDseedV1(Int_t det) - :AliTRDseed() - ,fReconstructor(0x0) - ,fClusterIter(0x0) + :AliTRDtrackletBase() + ,fkReconstructor(NULL) + ,fClusterIter(NULL) + ,fExB(0.) + ,fVD(0.) + ,fT0(0.) + ,fS2PRF(0.) + ,fDiffL(0.) + ,fDiffT(0.) ,fClusterIdx(0) + ,fErrorMsg(0) + ,fN(0) ,fDet(det) - ,fMom(0.) - ,fSnp(0.) - ,fTgl(0.) + ,fPt(0.) ,fdX(0.) + ,fX0(0.) + ,fX(0.) + ,fY(0.) + ,fZ(0.) + ,fS2Y(0.) + ,fS2Z(0.) + ,fChi2(0.) { // // Constructor // - //printf("AliTRDseedV1::AliTRDseedV1()\n"); - - for(int islice=0; islice < knSlices; islice++) fdEdx[islice] = 0.; + memset(fIndexes,0xFF,kNclusters*sizeof(fIndexes[0])); + memset(fClusters, 0, kNclusters*sizeof(AliTRDcluster*)); + memset(fPad, 0, 4*sizeof(Float_t)); + fYref[0] = 0.; fYref[1] = 0.; + fZref[0] = 0.; fZref[1] = 0.; + fYfit[0] = 0.; fYfit[1] = 0.; + fZfit[0] = 0.; fZfit[1] = 0.; + memset(fdEdx, 0, kNslices*sizeof(Float_t)); for(int ispec=0; ispecGetZat(fX0); + fZref[1] = rieman->GetDZat(fX0); + fYref[0] = rieman->GetYat(fX0); + fYref[1] = rieman->GetDYat(fX0); + if(fkReconstructor && fkReconstructor->IsHLT()){ + fRefCov[0] = 1; + fRefCov[2] = 10; + }else{ + fRefCov[0] = rieman->GetErrY(fX0); + fRefCov[2] = rieman->GetErrZ(fX0); + } + fC[0] = rieman->GetC(); + fChi2 = rieman->GetChi2(); } @@ -167,16 +276,125 @@ Bool_t AliTRDseedV1::Init(AliTRDtrackV1 *track) Double_t y, z; if(!track->GetProlongation(fX0, y, z)) return kFALSE; - fYref[0] = y; - fYref[1] = track->GetSnp()/(1. - track->GetSnp()*track->GetSnp()); - fZref[0] = z; - fZref[1] = track->GetTgl(); - - //printf("Tracklet ref x[%7.3f] y[%7.3f] z[%7.3f], snp[%f] tgl[%f]\n", fX0, fYref[0], fZref[0], track->GetSnp(), track->GetTgl()); + Update(track); return kTRUE; } +//_____________________________________________________________________________ +void AliTRDseedV1::Reset(Option_t *opt) +{ +// +// Reset seed. If option opt="c" is given only cluster arrays are cleared. +// + for(Int_t ic=kNclusters; ic--;) fIndexes[ic] = -1; + memset(fClusters, 0, kNclusters*sizeof(AliTRDcluster*)); + fN=0; SetBit(kRowCross, kFALSE); + if(strcmp(opt, "c")==0) return; + + fExB=0.;fVD=0.;fT0=0.;fS2PRF=0.; + fDiffL=0.;fDiffT=0.; + fClusterIdx=0; + fErrorMsg = 0; + fDet=-1; + fPt=0.; + fdX=0.;fX0=0.; fX=0.; fY=0.; fZ=0.; + fS2Y=0.; fS2Z=0.; + fC[0]=0.; fC[1]=0.; + fChi2 = 0.; + + memset(fPad, 0, 4*sizeof(Float_t)); + fYref[0] = 0.; fYref[1] = 0.; + fZref[0] = 0.; fZref[1] = 0.; + fYfit[0] = 0.; fYfit[1] = 0.; + fZfit[0] = 0.; fZfit[1] = 0.; + memset(fdEdx, 0, kNslices*sizeof(Float_t)); + for(int ispec=0; ispecGetSnp(); + Double_t fTgl = trk->GetTgl(); + fPt = trk->Pt(); + Double_t norm =1./TMath::Sqrt((1.-fSnp)*(1.+fSnp)); + fYref[1] = fSnp*norm; + fZref[1] = fTgl*norm; + SetCovRef(trk->GetCovariance()); + + Double_t dx = trk->GetX() - fX0; + fYref[0] = trk->GetY() - dx*fYref[1]; + fZref[0] = trk->GetZ() - dx*fZref[1]; +} + +//_____________________________________________________________________________ +void AliTRDseedV1::UpdateUsed() +{ + // + // Calculate number of used clusers in the tracklet + // + + Int_t nused = 0, nshared = 0; + for (Int_t i = kNclusters; i--; ) { + if (!fClusters[i]) continue; + if(fClusters[i]->IsUsed()){ + nused++; + } else if(fClusters[i]->IsShared()){ + if(IsStandAlone()) nused++; + else nshared++; + } + } + SetNUsed(nused); + SetNShared(nshared); +} + +//_____________________________________________________________________________ +void AliTRDseedV1::UseClusters() +{ + // + // Use clusters + // + // In stand alone mode: + // Clusters which are marked as used or shared from another track are + // removed from the tracklet + // + // In barrel mode: + // - Clusters which are used by another track become shared + // - Clusters which are attached to a kink track become shared + // + AliTRDcluster **c = &fClusters[0]; + for (Int_t ic=kNclusters; ic--; c++) { + if(!(*c)) continue; + if(IsStandAlone()){ + if((*c)->IsShared() || (*c)->IsUsed()){ + if((*c)->IsShared()) SetNShared(GetNShared()-1); + else SetNUsed(GetNUsed()-1); + (*c) = NULL; + fIndexes[ic] = -1; + SetN(GetN()-1); + continue; + } + } else { + if((*c)->IsUsed() || IsKink()){ + (*c)->SetShared(); + continue; + } + } + (*c)->Use(); + } +} + + + //____________________________________________________________________ void AliTRDseedV1::CookdEdx(Int_t nslices) { @@ -191,9 +409,7 @@ void AliTRDseedV1::CookdEdx(Int_t nslices) // Detailed description // Calculates average dE/dx for all slices. Depending on the PID methode // the number of slices can be 3 (LQ) or 8(NN). -// The calculation of dQ/dl are done using the tracklet fit results (see AliTRDseedV1::GetdQdl(Int_t)) i.e. -// -// dQ/dl = qc/(dx * sqrt(1 + dy/dx^2 + dz/dx^2)) +// The calculation of dQ/dl are done using the tracklet fit results (see AliTRDseedV1::GetdQdl(Int_t)) // // The following effects are included in the calculation: // 1. calibration values for t0 and vdrift (using x coordinate to calculate slice) @@ -201,98 +417,305 @@ void AliTRDseedV1::CookdEdx(Int_t nslices) // 3. cluster size // - Int_t nclusters[knSlices]; - for(int i=0; iGetX(); - + if(!(c = fClusters[ic]) && !(c = fClusters[ic+kNtb])) continue; + Float_t dx = TMath::Abs(fX0 - c->GetX()); + // Filter clusters for dE/dx calculation - + // 1.consider calibration effects for slice determination - Int_t slice; - if(cluster->IsInChamber()) slice = Int_t(TMath::Abs(fX0 - x) * nslices / clength); - else slice = x < fX0 ? 0 : nslices-1; - + Int_t slice; + if(dxIsInChamber() + slice = Int_t(dx * nslices / kDriftLength); + } else slice = c->GetX() < fX0 ? nslices-1 : 0; + + // 2. take sharing into account - Float_t w = cluster->IsShared() ? .5 : 1.; - + Float_t w = /*c->IsShared() ? .5 :*/ 1.; + // 3. take into account large clusters TODO //w *= c->GetNPads() > 3 ? .8 : 1.; - + //CHECK !!! fdEdx[slice] += w * GetdQdl(ic); //fdQdl[ic]; - nclusters[slice]++; } // End of loop over clusters +} - //if(fReconstructor->GetPIDMethod() == AliTRDReconstructor::kLQPID){ - if(nslices == AliTRDReconstructor::kLQslices){ - // calculate mean charge per slice (only LQ PID) - for(int is=0; isGetLabel(ilab) >= 0) { + labels[nlab] = fClusters[i]->GetLabel(ilab); + nlab++; + } } } + + fLabels[2] = AliMathBase::Freq(nlab,labels,out,kTRUE); + fLabels[0] = out[0]; + if ((fLabels[2] > 1) && (out[3] > 1)) fLabels[1] = out[2]; +} + +//____________________________________________________________ +Float_t AliTRDseedV1::GetAnodeWireOffset(Float_t zt) +{ +// Find position inside the amplification cell for reading drift velocity map + + Float_t d = fPad[3] - zt; + if(d<0.){ + AliError(Form("Fail AnodeWireOffset calculation z0[%+7.2f] zt[%+7.2f] d[%+7.2f].", fPad[3], zt, d)); + return 0.125; + } + d -= ((Int_t)(2 * d)) / 2.0; + if(d > 0.25) d = 0.5 - d; + return d; +} + + +//____________________________________________________________________ +Float_t AliTRDseedV1::GetCharge(Bool_t useOutliers) const +{ +// Computes total charge attached to tracklet. If "useOutliers" is set clusters +// which are not in chamber are also used (default false) + + AliTRDcluster *c(NULL); Float_t qt(0.); + for(int ic=0; icIsInChamber() && !useOutliers) continue; + qt += TMath::Abs(c->GetQ()); + } + return qt; } +//____________________________________________________________________ +Bool_t AliTRDseedV1::GetEstimatedCrossPoint(Float_t &x, Float_t &z) const +{ +// Algorithm to estimate cross point in the x-z plane for pad row cross tracklets. +// Returns true in case of success. + if(!IsRowCross()) return kFALSE; + + x=0.; z=0.; + AliTRDcluster *c(NULL); + // Find radial range for first row + Float_t x1[] = {0., 1.e3}; + for(int ic=0; icIsInChamber()) continue; + if(c->GetX() <= x1[1]) x1[1] = c->GetX(); + if(c->GetX() >= x1[0]) x1[0] = c->GetX(); + z=c->GetZ(); + } + if((x1[0] - x1[1])<1.e-5) return kFALSE; + + // Find radial range for second row + Bool_t kZ(kFALSE); + Float_t x2[] = {0., 1.e3}; + for(int ic=kNtb; icIsInChamber()) continue; + if(c->GetX() <= x2[1]) x2[1] = c->GetX(); + if(c->GetX() >= x2[0]) x2[0] = c->GetX(); + if(!kZ){ + z+=c->GetZ(); + z*=0.5; + kZ=kTRUE; + } + } + if((x2[0] - x2[1])<1.e-5) return kFALSE; + + // Find intersection of the 2 radial regions + x = 0.5*((x1[0]+x1[1] > x2[0]+x2[1]) ? (x1[1]+x2[0]) : (x1[0]+x2[1])); + return kTRUE; +} //____________________________________________________________________ -Float_t AliTRDseedV1::GetdQdl(Int_t ic) const +Float_t AliTRDseedV1::GetdQdl() const { - return fClusters[ic] ? TMath::Abs(fClusters[ic]->GetQ()) /fdX / TMath::Sqrt(1. + fYfit[1]*fYfit[1] + fZref[1]*fZref[1]) : 0.; +// Calculate total charge / tracklet length for 1D PID +// + Float_t Q = GetCharge(kTRUE); + return Q/TMath::Sqrt(1. + fYref[1]*fYref[1] + fZref[1]*fZref[1]); } //____________________________________________________________________ -Double_t* AliTRDseedV1::GetProbability() +Float_t AliTRDseedV1::GetdQdl(Int_t ic, Float_t *dl) const +{ +// Using the linear approximation of the track inside one TRD chamber (TRD tracklet) +// the charge per unit length can be written as: +// BEGIN_LATEX +// #frac{dq}{dl} = #frac{q_{c}}{dx * #sqrt{1 + #(){#frac{dy}{dx}}^{2}_{fit} + #(){#frac{dz}{dx}}^{2}_{ref}}} +// END_LATEX +// where qc is the total charge collected in the current time bin and dx is the length +// of the time bin. +// The following correction are applied : +// - charge : pad row cross corrections +// [diffusion and TRF assymetry] TODO +// - dx : anisochronity, track inclination - see Fit and AliTRDcluster::GetXloc() +// and AliTRDcluster::GetYloc() for the effects taken into account +// +//Begin_Html +// +//End_Html +// In the picture the energy loss measured on the tracklet as a function of drift time [left] and respectively +// drift length [right] for different particle species is displayed. +// Author : Alex Bercuci +// + Float_t dq = 0.; + // check whether both clusters are inside the chamber + Bool_t hasClusterInChamber = kFALSE; + if(fClusters[ic] && fClusters[ic]->IsInChamber()){ + hasClusterInChamber = kTRUE; + dq += TMath::Abs(fClusters[ic]->GetQ()); + } + if(fClusters[ic+kNtb] && fClusters[ic+kNtb]->IsInChamber()){ + hasClusterInChamber = kTRUE; + dq += TMath::Abs(fClusters[ic+kNtb]->GetQ()); + } + if(!hasClusterInChamber) return 0.; + if(dq<1.e-3) return 0.; + + Double_t dx = fdX; + if(ic-1>=0 && ic+1IsInChamber()) x2 = fClusters[ic-1]->GetX(); + else if(fClusters[ic-1+kNtb] && fClusters[ic-1+kNtb]->IsInChamber()) x2 = fClusters[ic-1+kNtb]->GetX(); + else if(fClusters[ic] && fClusters[ic]->IsInChamber()) x2 = fClusters[ic]->GetX()+fdX; + else x2 = fClusters[ic+kNtb]->GetX()+fdX; + // try to estimate lower radial position (find the cluster which is inside the chamber) + if(fClusters[ic+1] && fClusters[ic+1]->IsInChamber()) x1 = fClusters[ic+1]->GetX(); + else if(fClusters[ic+1+kNtb] && fClusters[ic+1+kNtb]->IsInChamber()) x1 = fClusters[ic+1+kNtb]->GetX(); + else if(fClusters[ic] && fClusters[ic]->IsInChamber()) x1 = fClusters[ic]->GetX()-fdX; + else x1 = fClusters[ic+kNtb]->GetX()-fdX; + + dx = .5*(x2 - x1); + } + dx *= TMath::Sqrt(1. + fYfit[1]*fYfit[1] + fZref[1]*fZref[1]); + if(dl) (*dl) = dx; + if(dx>1.e-9) return dq/dx; + else return 0.; +} + +//____________________________________________________________ +Float_t AliTRDseedV1::GetMomentum(Float_t *err) const +{ +// Returns momentum of the track after update with the current tracklet as: +// BEGIN_LATEX +// p=#frac{1}{1/p_{t}} #sqrt{1+tgl^{2}} +// END_LATEX +// and optionally the momentum error (if err is not null). +// The estimated variance of the momentum is given by: +// BEGIN_LATEX +// #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}) +// END_LATEX +// which can be simplified to +// BEGIN_LATEX +// #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} +// END_LATEX +// + + Double_t p = fPt*TMath::Sqrt(1.+fZref[1]*fZref[1]); + Double_t p2 = p*p; + Double_t tgl2 = fZref[1]*fZref[1]; + Double_t pt2 = fPt*fPt; + if(err){ + Double_t s2 = + p2*tgl2*pt2*pt2*fRefCov[4] + -2.*p2*fZref[1]*fPt*pt2*fRefCov[5] + +p2*pt2*fRefCov[6]; + (*err) = TMath::Sqrt(s2); + } + return p; +} + + +//____________________________________________________________________ +Float_t AliTRDseedV1::GetOccupancyTB() const +{ +// Returns procentage of TB occupied by clusters + + Int_t n(0); + AliTRDcluster *c(NULL); + for(int ic=0; icGetPIDObject(fReconstructor->GetPIDMethod()); + const AliTRDCalPID *pd = calibration->GetPIDObject(fkReconstructor->GetPIDMethod()); if (!pd) { AliError("No access to AliTRDCalPID object"); - return 0x0; + return kFALSE; } - //AliInfo(Form("Method[%d] : %s", fReconstructor->GetRecoParam() ->GetPIDMethod(), pd->IsA()->GetName())); // calculate tracklet length TO DO - Float_t length = (AliTRDgeometry::AmThick() + AliTRDgeometry::DrThick()); - /// TMath::Sqrt((1.0 - fSnp[iPlane]*fSnp[iPlane]) / (1.0 + fTgl[iPlane]*fTgl[iPlane])); + Float_t length = (AliTRDgeometry::AmThick() + AliTRDgeometry::DrThick())/ TMath::Sqrt((1.0 - GetSnp()*GetSnp()) / (1.0 + GetTgl()*GetTgl())); //calculate dE/dx - CookdEdx(fReconstructor->GetNdEdxSlices()); - - // Sets the a priori probabilities - for(int ispec=0; ispecGetProbability(ispec, fMom, &fdEdx[0], length, GetPlane()); - } + CookdEdx(AliTRDCalPID::kNSlicesNN); + AliDebug(4, Form("p=%6.4f[GeV/c] dEdx{%7.2f %7.2f %7.2f %7.2f %7.2f %7.2f %7.2f %7.2f} l=%4.2f[cm]", GetMomentum(), fdEdx[0], fdEdx[1], fdEdx[2], fdEdx[3], fdEdx[4], fdEdx[5], fdEdx[6], fdEdx[7], length)); - return &fProb[0]; + // Sets the a priori probabilities + Bool_t kPIDNN(fkReconstructor->GetPIDMethod()==AliTRDpidUtil::kNN); + for(int ispec=0; ispecGetProbability(ispec, GetMomentum(), &fdEdx[0], length, kPIDNN?GetPlane():fkReconstructor->GetRecoParam()->GetPIDLQslices()); + + return kTRUE; } //____________________________________________________________________ @@ -302,40 +725,234 @@ Float_t AliTRDseedV1::GetQuality(Bool_t kZcorr) const // Returns a quality measurement of the current seed // - Float_t zcorr = kZcorr ? fTilt * (fZProb - fZref[0]) : 0.; + Float_t zcorr = kZcorr ? GetTilt() * (fZfit[0] - fZref[0]) : 0.; return - .5 * TMath::Abs(18.0 - fN2) + .5 * TMath::Abs(18.0 - GetN()) + 10.* TMath::Abs(fYfit[1] - fYref[1]) + 5. * TMath::Abs(fYfit[0] - fYref[0] + zcorr) - + 2. * TMath::Abs(fMeanz - fZref[0]) / fPadLength; + + 2. * TMath::Abs(fZfit[0] - fZref[0]) / GetPadLength(); } //____________________________________________________________________ -void AliTRDseedV1::GetCovAt(Double_t /*x*/, Double_t *cov) const +void AliTRDseedV1::GetCovAt(Double_t x, Double_t *cov) const { -// Computes covariance in the y-z plane at radial point x +// Computes covariance in the y-z plane at radial point x (in tracking coordinates) +// and returns the results in the preallocated array cov[3] as : +// cov[0] = Var(y) +// cov[1] = Cov(yz) +// cov[2] = Var(z) +// +// Details +// +// For the linear transformation +// BEGIN_LATEX +// Y = T_{x} X^{T} +// END_LATEX +// The error propagation has the general form +// BEGIN_LATEX +// C_{Y} = T_{x} C_{X} T_{x}^{T} +// END_LATEX +// We apply this formula 2 times. First to calculate the covariance of the tracklet +// at point x we consider: +// BEGIN_LATEX +// T_{x} = (1 x); X=(y0 dy/dx); C_{X}=#(){#splitline{Var(y0) Cov(y0, dy/dx)}{Cov(y0, dy/dx) Var(dy/dx)}} +// END_LATEX +// and secondly to take into account the tilt angle +// BEGIN_LATEX +// T_{#alpha} = #(){#splitline{cos(#alpha) __ sin(#alpha)}{-sin(#alpha) __ cos(#alpha)}}; X=(y z); C_{X}=#(){#splitline{Var(y) 0}{0 Var(z)}} +// END_LATEX +// +// using simple trigonometrics one can write for this last case +// BEGIN_LATEX +// 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})}} +// END_LATEX +// which can be aproximated for small alphas (2 deg) with +// BEGIN_LATEX +// 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}}} +// END_LATEX +// +// before applying the tilt rotation we also apply systematic uncertainties to the tracklet +// position which can be tunned from outside via the AliTRDrecoParam::SetSysCovMatrix(). They might +// account for extra misalignment/miscalibration uncertainties. +// +// Author : +// Alex Bercuci +// Date : Jan 8th 2009 +// - Int_t ic = 0; while (!fClusters[ic]) ic++; - AliTRDcalibDB *fCalib = AliTRDcalibDB::Instance(); - Double_t exB = fCalib->GetOmegaTau(fCalib->GetVdriftAverage(fClusters[ic]->GetDetector()), -AliTracker::GetBz()*0.1); - Double_t sy2 = fSigmaY2*fSigmaY2 + .2*(fYfit[1]-exB)*(fYfit[1]-exB); - Double_t sz2 = fPadLength/12.; + Double_t xr = fX0-x; + Double_t sy2 = fCov[0] +2.*xr*fCov[1] + xr*xr*fCov[2]; + Double_t sz2 = fS2Z; + //GetPadLength()*GetPadLength()/12.; + // insert systematic uncertainties + if(fkReconstructor){ + Double_t sys[15]; memset(sys, 0, 15*sizeof(Double_t)); + fkReconstructor->GetRecoParam()->GetSysCovMatrix(sys); + sy2 += sys[0]; + sz2 += sys[1]; + } - //printf("Yfit[1] %f sy20 %f SigmaY2 %f\n", fYfit[1], sy20, fSigmaY2); + // rotate covariance matrix if no RC + if(!IsRowCross()){ + Double_t t2 = GetTilt()*GetTilt(); + Double_t correction = 1./(1. + t2); + cov[0] = (sy2+t2*sz2)*correction; + cov[1] = GetTilt()*(sz2 - sy2)*correction; + cov[2] = (t2*sy2+sz2)*correction; + } else { + cov[0] = sy2; cov[1] = 0.; cov[2] = sy2; + } - cov[0] = sy2; - cov[1] = fTilt*(sy2-sz2); - cov[2] = sz2; + AliDebug(4, Form("C(%6.1f %+6.3f %6.1f) RC[%c]", 1.e4*TMath::Sqrt(cov[0]), cov[1], 1.e4*TMath::Sqrt(cov[2]), IsRowCross()?'y':'n')); +} - // insert systematic uncertainties calibration and misalignment - Double_t sys[15]; - fReconstructor->GetRecoParam()->GetSysCovMatrix(sys); - cov[0] += (sys[0]*sys[0]); - cov[2] += (sys[1]*sys[1]); +//____________________________________________________________ +Int_t AliTRDseedV1::GetCovSqrt(const Double_t * const c, Double_t *d) +{ +// Helper function to calculate the square root of the covariance matrix. +// The input matrix is stored in the vector c and the result in the vector d. +// Both arrays have to be initialized by the user with at least 3 elements. Return negative in case of failure. +// +// For calculating the square root of the symmetric matrix c +// the following relation is used: +// BEGIN_LATEX +// C^{1/2} = VD^{1/2}V^{-1} +// END_LATEX +// with V being the matrix with the n eigenvectors as columns. +// In case C is symmetric the followings are true: +// - matrix D is diagonal with the diagonal given by the eigenvalues of C +// - V = V^{-1} +// +// Author A.Bercuci +// Date Mar 19 2009 + + const Double_t kZero(1.e-20); + Double_t l[2], // eigenvalues + v[3]; // eigenvectors + // the secular equation and its solution : + // (c[0]-L)(c[2]-L)-c[1]^2 = 0 + // L^2 - L*Tr(c)+DET(c) = 0 + // L12 = [Tr(c) +- sqrt(Tr(c)^2-4*DET(c))]/2 + Double_t tr = c[0]+c[2], // trace + det = c[0]*c[2]-c[1]*c[1]; // determinant + if(TMath::Abs(det)c[2]?-1.:1.)); + l[1] = .5*(tr + dd*(c[0]>c[2]?1.:-1.)); + if(l[0] +// Date Mar 19 2009 + + Double_t det = c[0]*c[2] - c[1]*c[1]; + if(TMath::Abs(det)<1.e-20) return 0.; + Double_t invDet = 1./det; + d[0] = c[2]*invDet; + d[1] =-c[1]*invDet; + d[2] = c[0]*invDet; + return det; +} + +//____________________________________________________________________ +UShort_t AliTRDseedV1::GetVolumeId() const +{ +// Returns geometry volume id by delegation + + for(Int_t ic(0);icGetVolumeId(); + } + return 0; +} + + +//____________________________________________________________________ +void AliTRDseedV1::Calibrate() +{ +// Retrieve calibration and position parameters from OCDB. +// The following information are used +// - detector index +// - column and row position of first attached cluster. If no clusters are attached +// to the tracklet a random central chamber position (c=70, r=7) will be used. +// +// The following information is cached in the tracklet +// t0 (trigger delay) +// drift velocity +// PRF width +// omega*tau = tg(a_L) +// diffusion coefficients (longitudinal and transversal) +// +// Author : +// Alex Bercuci +// Date : Jan 8th 2009 +// + + AliCDBManager *cdb = AliCDBManager::Instance(); + if(cdb->GetRun() < 0){ + AliError("OCDB manager not properly initialized"); + return; + } + + AliTRDcalibDB *calib = AliTRDcalibDB::Instance(); + AliTRDCalROC *vdROC = calib->GetVdriftROC(fDet), + *t0ROC = calib->GetT0ROC(fDet);; + const AliTRDCalDet *vdDet = calib->GetVdriftDet(); + const AliTRDCalDet *t0Det = calib->GetT0Det(); + + Int_t col = 70, row = 7; + AliTRDcluster **c = &fClusters[0]; + if(GetN()){ + Int_t ic = 0; + while (icGetPadCol(); + row = (*c)->GetPadRow(); + } + } + + fT0 = (t0Det->GetValue(fDet) + t0ROC->GetValue(col,row)) / AliTRDCommonParam::Instance()->GetSamplingFrequency(); + fVD = vdDet->GetValue(fDet) * vdROC->GetValue(col, row); + fS2PRF = calib->GetPRFWidth(fDet, col, row); fS2PRF *= fS2PRF; + fExB = AliTRDCommonParam::Instance()->GetOmegaTau(fVD); + AliTRDCommonParam::Instance()->GetDiffCoeff(fDiffL, + fDiffT, fVD); + AliDebug(4, Form("Calibration params for Det[%3d] Col[%3d] Row[%2d]\n t0[%f] vd[%f] s2PRF[%f] ExB[%f] Dl[%f] Dt[%f]", fDet, col, row, fT0, fVD, fS2PRF, fExB, fDiffL, fDiffT)); + + + SetBit(kCalib, kTRUE); +} //____________________________________________________________________ void AliTRDseedV1::SetOwner() @@ -343,456 +960,1247 @@ void AliTRDseedV1::SetOwner() //AliInfo(Form("own [%s] fOwner[%s]", own?"YES":"NO", fOwner?"YES":"NO")); if(TestBit(kOwner)) return; - for(int ic=0; icGetLengthIPad(); + fPad[1] = p->GetWidthIPad(); + fPad[2] = TMath::Tan(TMath::DegToRad()*p->GetTiltingAngle()); + fPad[3] = p->GetRow0() + p->GetAnodeWireOffset(); +} + + + //____________________________________________________________________ -Bool_t AliTRDseedV1::AttachClustersIter(AliTRDtrackingChamber *chamber, Float_t quality, Bool_t kZcorr, AliTRDcluster *c) +Bool_t AliTRDseedV1::AttachClusters(AliTRDtrackingChamber *const chamber, Bool_t tilt, Bool_t chgPos, Int_t ev) { - // - // Iterative process to register clusters to the seed. - // In iteration 0 we try only one pad-row and if quality not - // sufficient we try 2 pad-rows (about 5% of tracks cross 2 pad-rows) - // - // debug level 7 - // - - if(!fReconstructor->GetRecoParam() ){ - AliError("Seed can not be used without a valid RecoParam."); +// +// Projective algorithm to attach clusters to seeding tracklets. The following steps are performed : +// 1. Collapse x coordinate for the full detector plane +// 2. truncated mean on y (r-phi) direction +// 3. purge clusters +// 4. truncated mean on z direction +// 5. purge clusters +// +// Parameters +// - chamber : pointer to tracking chamber container used to search the tracklet +// - tilt : switch for tilt correction during road building [default true] +// Output +// - true : if tracklet found successfully. Failure can happend because of the following: +// - +// Detailed description +// +// We start up by defining the track direction in the xy plane and roads. The roads are calculated based +// on tracking information (variance in the r-phi direction) and estimated variance of the standard +// clusters (see AliTRDcluster::SetSigmaY2()) corrected for tilt (see GetCovAt()). From this the road is +// BEGIN_LATEX +// r_{y} = 3*#sqrt{12*(#sigma^{2}_{Trk}(y) + #frac{#sigma^{2}_{cl}(y) + tg^{2}(#alpha_{L})#sigma^{2}_{cl}(z)}{1+tg^{2}(#alpha_{L})})} +// r_{z} = 1.5*L_{pad} +// END_LATEX +// +// Author : Alexandru Bercuci +// Debug : level = 2 for calibration +// level = 3 for visualization in the track SR +// level = 4 for full visualization including digit level + + const AliTRDrecoParam* const recoParam = fkReconstructor->GetRecoParam(); //the dynamic cast in GetRecoParam is slow, so caching the pointer to it + + if(!recoParam){ + AliError("Tracklets can not be used without a valid RecoParam."); + return kFALSE; + } + AliTRDcalibDB *calibration = AliTRDcalibDB::Instance(); + if (!calibration) { + AliError("No access to calibration data"); + return kFALSE; + } + // Retrieve the CDB container class with the parametric likelihood + const AliTRDCalTrkAttach *attach = calibration->GetAttachObject(); + if (!attach) { + AliError("No usable AttachClusters calib object."); return kFALSE; } - AliTRDchamberTimeBin *layer = 0x0; - if(fReconstructor->GetStreamLevel(AliTRDReconstructor::kTracker)>=7){ - AliTRDtrackingChamber *ch = new AliTRDtrackingChamber(*chamber); - (*AliTRDtrackerV1::DebugStreamer()) << "AttachClustersIter" - << "chamber.=" << ch - << "tracklet.=" << this - << "\n"; + // Initialize reco params for this tracklet + // 1. first time bin in the drift region + Int_t t0 = 14; + Int_t kClmin = Int_t(recoParam->GetFindableClusters()*AliTRDtrackerV1::GetNTimeBins()); + Int_t kTBmin = 4; + + Double_t sysCov[5]; recoParam->GetSysCovMatrix(sysCov); + Double_t s2yTrk= fRefCov[0], + s2yCl = 0., + s2zCl = GetPadLength()*GetPadLength()/12., + syRef = TMath::Sqrt(s2yTrk), + t2 = GetTilt()*GetTilt(); + //define roads + const Double_t kroady = 3.; //recoParam->GetRoad1y(); + const Double_t kroadz = GetPadLength() * recoParam->GetRoadzMultiplicator() + 1.; + // define probing cluster (the perfect cluster) and default calibration + Short_t sig[] = {0, 0, 10, 30, 10, 0,0}; + AliTRDcluster cp(fDet, 6, 75, 0, sig, 0); + if(fkReconstructor->IsHLT()) cp.SetRPhiMethod(AliTRDcluster::kCOG); + if(!IsCalibrated()) Calibrate(); + + Int_t kroadyShift(0); + Float_t bz(AliTrackerBase::GetBz()); + if(TMath::Abs(bz)>2.){ + if(bz<0.) kroadyShift = chgPos ? +1 : -1; + else kroadyShift = chgPos ? -1 : +1; } + AliDebug(4, Form("\n syTrk[cm]=%4.2f dydxTrk[deg]=%+6.2f rs[%d] Chg[%c] rY[cm]=%4.2f rZ[cm]=%5.2f TC[%c]", syRef, TMath::ATan(fYref[1])*TMath::RadToDeg(), kroadyShift, chgPos?'+':'-', kroady, kroadz, tilt?'y':'n')); + Double_t phiTrk(TMath::ATan(fYref[1])), + thtTrk(TMath::ATan(fZref[1])); - Float_t tquality; - Double_t kroady = fReconstructor->GetRecoParam() ->GetRoad1y(); - Double_t kroadz = fPadLength * .5 + 1.; - - // initialize configuration parameters - Float_t zcorr = kZcorr ? fTilt * (fZProb - fZref[0]) : 0.; - Int_t niter = kZcorr ? 1 : 2; - - Double_t yexp, zexp; - Int_t ncl = 0; - // start seed update - for (Int_t iter = 0; iter < niter; iter++) { - ncl = 0; - for (Int_t iTime = 0; iTime < AliTRDtrackerV1::GetNTimeBins(); iTime++) { - if(!(layer = chamber->GetTB(iTime))) continue; - if(!Int_t(*layer)) continue; - - // define searching configuration - Double_t dxlayer = layer->GetX() - fX0; - if(c){ - zexp = c->GetZ(); - //Try 2 pad-rows in second iteration - if (iter > 0) { - zexp = fZref[0] + fZref[1] * dxlayer - zcorr; - if (zexp > c->GetZ()) zexp = c->GetZ() + fPadLength*0.5; - if (zexp < c->GetZ()) zexp = c->GetZ() - fPadLength*0.5; - } - } else zexp = fZref[0] + (kZcorr ? fZref[1] * dxlayer : 0.); - yexp = fYref[0] + fYref[1] * dxlayer - zcorr; - - // Get and register cluster - Int_t index = layer->SearchNearestCluster(yexp, zexp, kroady, kroadz); - if (index < 0) continue; - AliTRDcluster *cl = (*layer)[index]; - - fIndexes[iTime] = layer->GetGlobalIndex(index); - fClusters[iTime] = cl; - fY[iTime] = cl->GetY(); - fZ[iTime] = cl->GetZ(); - ncl++; + // working variables + const Int_t kNrows = 16; + const Int_t kNcls = 3*kNclusters; // buffer size + TObjArray clst[kNrows]; + Bool_t blst[kNrows][kNcls]; + Double_t cond[4], + dx, dy, dz, + yt, zt, + zc[kNrows], + xres[kNrows][kNcls], yres[kNrows][kNcls], zres[kNrows][kNcls], s2y[kNrows][kNcls]; + Int_t idxs[kNrows][kNcls], ncl[kNrows], ncls = 0; + memset(ncl, 0, kNrows*sizeof(Int_t)); + memset(zc, 0, kNrows*sizeof(Double_t)); + memset(idxs, 0, kNrows*kNcls*sizeof(Int_t)); + memset(xres, 0, kNrows*kNcls*sizeof(Double_t)); + memset(yres, 0, kNrows*kNcls*sizeof(Double_t)); + memset(zres, 0, kNrows*kNcls*sizeof(Double_t)); + memset(s2y, 0, kNrows*kNcls*sizeof(Double_t)); + memset(blst, 0, kNrows*kNcls*sizeof(Bool_t)); //this is 8 times faster to memset than "memset(clst, 0, kNrows*kNcls*sizeof(AliTRDcluster*))" + + Double_t roady(0.), s2Mean(0.), sMean(0.); Int_t ns2Mean(0); + + // Do cluster projection and pick up cluster candidates + AliTRDcluster *c(NULL); + AliTRDchamberTimeBin *layer(NULL); + Bool_t kBUFFER = kFALSE; + for (Int_t it = 0; it < kNtb; it++) { + if(!(layer = chamber->GetTB(it))) continue; + if(!Int_t(*layer)) continue; + // get track projection at layers position + dx = fX0 - layer->GetX(); + yt = fYref[0] - fYref[1] * dx; + zt = fZref[0] - fZref[1] * dx; + // get standard cluster error corrected for tilt if selected + cp.SetLocalTimeBin(it); + cp.SetSigmaY2(0.02, fDiffT, fExB, dx, -1./*zt*/, fYref[1]); + s2yCl = cp.GetSigmaY2() + sysCov[0]; if(!tilt) s2yCl = (s2yCl + t2*s2zCl)/(1.+t2); + if(TMath::Abs(it-12)<7){ s2Mean += cp.GetSigmaY2(); ns2Mean++;} + // get estimated road in r-phi direction + roady = TMath::Min(3.*TMath::Sqrt(12.*(s2yTrk + s2yCl)), kroady); + + AliDebug(5, Form("\n" + " %2d xd[cm]=%6.3f yt[cm]=%7.2f zt[cm]=%8.2f\n" + " syTrk[um]=%6.2f syCl[um]=%6.2f syClTlt[um]=%6.2f\n" + " Ry[mm]=%f" + , it, dx, yt, zt + , 1.e4*TMath::Sqrt(s2yTrk), 1.e4*TMath::Sqrt(cp.GetSigmaY2()+sysCov[0]), 1.e4*TMath::Sqrt(s2yCl) + , 1.e1*roady)); + + // get clusters from layer + cond[0] = yt/*+0.5*kroadyShift*kroady*/; cond[2] = roady; + cond[1] = zt; cond[3] = kroadz; + Int_t n=0, idx[6]; layer->GetClusters(cond, idx, n, 6); + for(Int_t ic = n; ic--;){ + c = (*layer)[idx[ic]]; + dx = fX0 - c->GetX(); + yt = fYref[0] - fYref[1] * dx; + zt = fZref[0] - fZref[1] * dx; + dz = zt - c->GetZ(); + dy = yt - (c->GetY() + (tilt ? (GetTilt() * dz) : 0.)); + Int_t r = c->GetPadRow(); + clst[r].AddAtAndExpand(c, ncl[r]); + blst[r][ncl[r]] = kTRUE; + idxs[r][ncl[r]] = idx[ic]; + zres[r][ncl[r]] = dz/GetPadLength(); + yres[r][ncl[r]] = dy; + xres[r][ncl[r]] = dx; + zc[r] = c->GetZ(); + // TODO temporary solution to avoid divercences in error parametrization + s2y[r][ncl[r]] = TMath::Min(c->GetSigmaY2()+sysCov[0], 0.025); + AliDebug(5, Form(" -> dy[cm]=%+7.4f yc[cm]=%7.2f row[%d] idx[%2d]", dy, c->GetY(), r, ncl[r])); + ncl[r]++; ncls++; + + if(ncl[r] >= kNcls) { + AliWarning(Form("Cluster candidates row[%d] reached buffer limit[%d]. Some may be lost.", r, kNcls)); + kBUFFER = kTRUE; + break; + } } - if(fReconstructor->GetStreamLevel(AliTRDReconstructor::kTracker)>=7) AliInfo(Form("iter = %d ncl [%d] = %d", iter, fDet, ncl)); - - if(ncl>1){ - // calculate length of the time bin (calibration aware) - Int_t irp = 0; Float_t x[2]; Int_t tb[2]; - for (Int_t iTime = 0; iTime < AliTRDtrackerV1::GetNTimeBins(); iTime++) { - if(!fClusters[iTime]) continue; - x[irp] = fClusters[iTime]->GetX(); - tb[irp] = iTime; - irp++; - if(irp==2) break; - } - fdX = (x[1] - x[0]) / (tb[0] - tb[1]); - - // update X0 from the clusters (calibration/alignment aware) - for (Int_t iTime = 0; iTime < AliTRDtrackerV1::GetNTimeBins(); iTime++) { - if(!(layer = chamber->GetTB(iTime))) continue; - if(!layer->IsT0()) continue; - if(fClusters[iTime]){ - fX0 = fClusters[iTime]->GetX(); - break; - } else { // we have to infere the position of the anode wire from the other clusters - for (Int_t jTime = iTime+1; jTime < AliTRDtrackerV1::GetNTimeBins(); jTime++) { - if(!fClusters[jTime]) continue; - fX0 = fClusters[jTime]->GetX() + fdX * (jTime - iTime); + if(kBUFFER) break; + } + if(ncls=2){ + if(nrc==2){ + if(zresRow[0]>zresRow[1]){ // swap + Int_t itmp=idxRow[1]; idxRow[1] = idxRow[0]; idxRow[0] = itmp; + Double_t dtmp=zresRow[1]; zresRow[1] = zresRow[0]; zresRow[0] = dtmp; + } + if(TMath::Abs(idxRow[1] - idxRow[0]) != 1){ + SetErrorMsg(kAttachRowGap); + AliDebug(2, Form("Rows attached not continuous. Select first candidate.\n" + " row[%2d] Ncl[%2d] [cm]=%+8.2f row[%2d] Ncl[%2d] [cm]=%+8.2f", + idxRow[0], ncl[idxRow[0]], zresRow[0], idxRow[1], ncl[idxRow[1]], zresRow[1])); + nrc=1; idxRow[1] = -1; zresRow[1] = 999.; + } + } else { + Int_t idx0[kNrows]; + TMath::Sort(nrc, zresRow, idx0, kFALSE); + nrc = 3; // select only maximum first 3 candidates + Int_t iatmp[] = {-1, -1, -1}; Double_t datmp[] = {999., 999., 999.}; + for(Int_t irc(0); irc[cm]=%+8.2f\n" + "row[%2d] Ncl[%2d] [cm]=%+8.2f\n" + "row[%2d] Ncl[%2d] [cm]=%+8.2f", + idxRow[0], ncl[idxRow[0]], zresRow[0], + idxRow[1], ncl[idxRow[1]], zresRow[1], + idxRow[2], ncl[idxRow[2]], zresRow[2])); + if(TMath::Abs(idxRow[0] - idxRow[2]) == 1){ // select second candidate + AliDebug(2, "Solved ! Remove second candidate."); + nrc = 2; + idxRow[1] = idxRow[2]; zresRow[1] = zresRow[2]; // swap + idxRow[2] = -1; zresRow[2] = 999.; // remove + } else if(TMath::Abs(idxRow[1] - idxRow[2]) == 1){ + if(ncl[idxRow[1]]+ncl[idxRow[2]] > ncl[idxRow[0]]){ + AliDebug(2, "Solved ! Remove first candidate."); + nrc = 2; + idxRow[0] = idxRow[1]; zresRow[0] = zresRow[1]; // swap + idxRow[1] = idxRow[2]; zresRow[1] = zresRow[2]; // swap + } else { + AliDebug(2, "Solved ! Remove second and third candidate."); + nrc = 1; + idxRow[1] = -1; zresRow[1] = 999.; // remove + idxRow[2] = -1; zresRow[2] = 999.; // remove } + } else { + AliDebug(2, "Unsolved !!! Remove second and third candidate."); + nrc = 1; + idxRow[1] = -1; zresRow[1] = 999.; // remove + idxRow[2] = -1; zresRow[2] = 999.; // remove + } + } else { // remove temporary candidate + nrc = 2; + idxRow[2] = -1; zresRow[2] = 999.; + } + } + } + AliDebug(4, Form("Sorted row candidates:\n" + " row[%2d] Ncl[%2d] [cm]=%+8.2f row[%2d] Ncl[%2d] [cm]=%+8.2f" + , idxRow[0], ncl[idxRow[0]], zresRow[0], idxRow[1], ncl[idxRow[1]], zresRow[1])); + + // initialize debug streamer + TTreeSRedirector *pstreamer(NULL); + if(recoParam->GetStreamLevel(AliTRDrecoParam::kTracker) > 3 && fkReconstructor->IsDebugStreaming()) pstreamer = fkReconstructor->GetDebugStream(AliTRDrecoParam::kTracker); + if(pstreamer){ + // save config. for calibration + TVectorD vdy[2], vdx[2], vs2[2]; + for(Int_t jr(0); jrGetStreamLevel(AliTRDrecoParam::kTracker) > 4){ + Int_t idx(idxRow[1]); + if(idx<0){ + for(Int_t ir(0); ir0) continue; + idx = ir; break; } - } - - // update YZ reference point - // TODO + } + (*pstreamer) << "AttachClusters5" + << "c0.=" << &clst[idxRow[0]] + << "c1.=" << &clst[idx] + << "\n"; + } + } + +//======================================================================================= + // Analyse cluster topology + Double_t f[kNcls], // likelihood factors for segments + r[2][kNcls], // d(dydx) of tracklet candidate with respect to track + xm[2][kNcls], // mean + ym[2][kNcls], // mean + sm[2][kNcls], // mean + s[2][kNcls], // sigma_y + p[2][kNcls]; // prob of Gauss + memset(f, 0, kNcls*sizeof(Double_t)); + Int_t index[2][kNcls], n[2][kNcls]; + memset(n, 0, 2*kNcls*sizeof(Int_t)); + Int_t mts(0), nts[2] = {0, 0}; // no of tracklet segments in row + AliTRDpadPlane *pp(AliTRDtransform::Geometry().GetPadPlane(fDet)); + AliTRDtrackletOflHelper helper; + Int_t lyDet(AliTRDgeometry::GetLayer(fDet)); + for(Int_t jr(0), n0(0); jrGetX() - fX0; - } + // for longer tracklet segments + if(!kInit) n0 = helper.Init(pp, &clst[ir], index[jr], its); + Int_t n1 = helper.GetRMS(r[jr][its], ym[jr][its], s[jr][its], xm[jr][its]); + p[jr][its] = Double_t(n1)/n0; + sm[jr][its] = helper.GetSyMean(); - AliTRDseed::Update(); + Double_t dxm= fX0 - xm[jr][its]; + yt = fYref[0] - fYref[1]*dxm; + zt = fZref[0] - fZref[1]*dxm; + // correct tracklet fit for tilt + ym[jr][its]+= GetTilt()*(zt - zc[ir]); + r[jr][its] += GetTilt() * fZref[1]; + // correct tracklet fit for track position/inclination + ym[jr][its]= yt - ym[jr][its]; + r[jr][its] = (r[jr][its] - fYref[1])/(1+r[jr][its]*fYref[1]); + // report inclination in radians + r[jr][its] = TMath::ATan(r[jr][its]); + if(jr) continue; // calculate only for first row likelihoods + + f[its] = attach->CookLikelihood(chgPos, lyDet, fPt, phiTrk, n[jr][its], ym[jr][its]/*sRef*/, r[jr][its]*TMath::RadToDeg(), s[jr][its]/sm[jr][its]); } - if(fReconstructor->GetStreamLevel(AliTRDReconstructor::kTracker)>=7) AliInfo(Form("iter = %d nclFit [%d] = %d", iter, fDet, fN2)); - - if(IsOK()){ - tquality = GetQuality(kZcorr); - if(tquality < quality) break; - else quality = tquality; + } + AliDebug(4, Form(" Tracklet candidates: row[%2d] = %2d row[%2d] = %2d:", idxRow[0], nts[0], idxRow[1], nts[1])); + if(AliLog::GetDebugLevel("TRD", "AliTRDseedV1")>3){ + for(Int_t jr(0); jrGetStreamLevel(AliTRDReconstructor::kTracker)>=1) CookLabels(); - UpdateUsed(); - return kTRUE; -} - -//____________________________________________________________________ -Bool_t AliTRDseedV1::AttachClusters(AliTRDtrackingChamber *chamber - ,Bool_t kZcorr) -{ - // - // Projective algorithm to attach clusters to seeding tracklets - // - // Parameters - // - // Output - // - // Detailed description - // 1. Collapse x coordinate for the full detector plane - // 2. truncated mean on y (r-phi) direction - // 3. purge clusters - // 4. truncated mean on z direction - // 5. purge clusters - // 6. fit tracklet - // - - if(!fReconstructor->GetRecoParam() ){ - AliError("Seed can not be used without a valid RecoParam."); - return kFALSE; } - - const Int_t kClusterCandidates = 2 * knTimebins; - - //define roads - Double_t kroady = fReconstructor->GetRecoParam() ->GetRoad1y(); - Double_t kroadz = fPadLength * 1.5 + 1.; - // correction to y for the tilting angle - Float_t zcorr = kZcorr ? fTilt * (fZProb - fZref[0]) : 0.; - - // working variables - AliTRDcluster *clusters[kClusterCandidates]; - Double_t cond[4], yexp[knTimebins], zexp[knTimebins], - yres[kClusterCandidates], zres[kClusterCandidates]; - Int_t ncl, *index = 0x0, tboundary[knTimebins]; - - // Do cluster projection - AliTRDchamberTimeBin *layer = 0x0; - Int_t nYclusters = 0; Bool_t kEXIT = kFALSE; - for (Int_t iTime = 0; iTime < AliTRDtrackerV1::GetNTimeBins(); iTime++) { - if(!(layer = chamber->GetTB(iTime))) continue; - if(!Int_t(*layer)) continue; - - fX[iTime] = layer->GetX() - fX0; - zexp[iTime] = fZref[0] + fZref[1] * fX[iTime]; - yexp[iTime] = fYref[0] + fYref[1] * fX[iTime] - zcorr; - - // build condition and process clusters - cond[0] = yexp[iTime] - kroady; cond[1] = yexp[iTime] + kroady; - cond[2] = zexp[iTime] - kroadz; cond[3] = zexp[iTime] + kroadz; - layer->GetClusters(cond, index, ncl); - for(Int_t ic = 0; icGetCluster(index[ic]); - clusters[nYclusters] = c; - yres[nYclusters++] = c->GetY() - yexp[iTime]; - if(nYclusters >= kClusterCandidates) { - AliWarning(Form("Cluster candidates reached limit %d. Some may be lost.", kClusterCandidates)); - kEXIT = kTRUE; - break; + if(!pstreamer && recoParam->GetStreamLevel(AliTRDrecoParam::kTracker) > 2 && fkReconstructor->IsDebugStreaming()) pstreamer = fkReconstructor->GetDebugStream(AliTRDrecoParam::kTracker); + if(pstreamer){ + // save config. for calibration + TVectorD vidx, vn, vx, vy, vr, vs, vsm, vp, vf; + vidx.ResizeTo(ncl[idxRow[0]]+(idxRow[1]<0?0:ncl[idxRow[1]])); + vn.ResizeTo(mts); + vx.ResizeTo(mts); + vy.ResizeTo(mts); + vr.ResizeTo(mts); + vs.ResizeTo(mts); + vsm.ResizeTo(mts); + vp.ResizeTo(mts); + vf.ResizeTo(mts); + for(Int_t jr(0), jts(0), jc(0); jr 4. * sigma){ - clusters[ic] = 0x0; - continue; + +//========================================================= + // Get seed tracklet segment + Int_t idx2[kNcls]; memset(idx2, 0, kNcls*sizeof(Int_t)); // seeding indexing + if(nts[0]>1) TMath::Sort(nts[0], f, idx2); + Int_t is(idx2[0]); // seed index + Int_t idxTrklt[kNcls], + kts(0), + nTrklt(n[0][is]); + Double_t fTrklt(f[is]), + rTrklt(r[0][is]), + yTrklt(ym[0][is]), + sTrklt(s[0][is]), + smTrklt(sm[0][is]), + xTrklt(xm[0][is]), + pTrklt(p[0][is]); + memset(idxTrklt, 0, kNcls*sizeof(Int_t)); + // check seed idx2[0] exit if not found + if(f[is]<1.e-2){ + AliDebug(1, Form("Seed seg[%d] row[%2d] n[%2d] f[%f]<0.01.", is, idxRow[0], n[0][is], f[is])); + SetErrorMsg(kAttachClAttach); + if(!pstreamer && recoParam->GetStreamLevel(AliTRDrecoParam::kTracker) > 1 && fkReconstructor->IsDebugStreaming()) pstreamer = fkReconstructor->GetDebugStream(AliTRDrecoParam::kTracker); + if(pstreamer){ + UChar_t stat(0); + if(IsKink()) SETBIT(stat, 1); + if(IsStandAlone()) SETBIT(stat, 2); + if(IsRowCross()) SETBIT(stat, 3); + SETBIT(stat, 4); // set error bit + TVectorD vidx; vidx.ResizeTo(1); vidx[0] = is; + (*pstreamer) << "AttachClusters2" + << "stat=" << stat + << "ev=" << ev + << "chg=" << chgPos + << "det=" << fDet + << "x0=" << fX0 + << "y0=" << fYref[0] + << "z0=" << fZref[0] + << "phi=" << phiTrk + << "tht=" << thtTrk + << "pt=" << fPt + << "s2Trk=" << s2yTrk + << "s2Cl=" << s2Mean + << "idx=" << &vidx + << "n=" << nTrklt + << "f=" << fTrklt + << "x=" << xTrklt + << "y=" << yTrklt + << "r=" << rTrklt + << "s=" << sTrklt + << "sm=" << smTrklt + << "p=" << pTrklt + << "\n"; } - zres[nZclusters++] = clusters[ic]->GetZ() - zexp[clusters[ic]->GetLocalTimeBin()]; + return kFALSE; } + AliDebug(2, Form("Seed seg[%d] row[%2d] n[%2d] dy[%f] r[%+5.2f] s[%+5.2f] f[%5.3f]", is, idxRow[0], n[0][is], ym[0][is], r[0][is]*TMath::RadToDeg(), s[0][is]/sm[0][is], f[is])); + + // save seeding segment in the helper + idxTrklt[kts++] = is; + helper.Init(pp, &clst[idxRow[0]], index[0], is); + AliTRDtrackletOflHelper test; // helper to test segment expantion + Float_t rcLikelihood(0.); SetBit(kRowCross, kFALSE); + Double_t dyRez[kNcls]; Int_t idx3[kNcls]; - // Evaluate truncated mean on the z direction - AliMathBase::EvaluateUni(nZclusters, zres, mean, sigma, Int_t(nZclusters*.8)-2); - // purge cluster candidates - for(Int_t ic = 0; ic 4. * sigma){ - clusters[ic] = 0x0; - continue; + //========================================================= + // Define filter parameters from OCDB + Int_t kNSgmDy[2]; attach->GetNsgmDy(kNSgmDy[0], kNSgmDy[1]); + Float_t kLikeMinRelDecrease[2]; attach->GetLikeMinRelDecrease(kLikeMinRelDecrease[0], kLikeMinRelDecrease[1]); + Float_t kRClikeLimit(attach->GetRClikeLimit()); + + //========================================================= + // Try attaching next segments from first row (if any) + if(nts[0]>1){ + Int_t jr(0), ir(idxRow[jr]); + // organize secondary sgms. in decreasing order of their distance from seed + memset(dyRez, 0, nts[jr]*sizeof(Double_t)); + for(Int_t jts(1); jts kNSgmDy[jr]*smTrklt){ + AliDebug(2, Form("Reject seg[%d] row[%2d] n[%2d] dy[%f] > %d*s[%f].", its, idxRow[jr], n[jr][its], dyRez[its], kNSgmDy[jr], kNSgmDy[jr]*smTrklt)); + continue; + } + + test = helper; + Int_t n0 = test.Expand(&clst[ir], index[jr], its); + Double_t rt, dyt, st, xt, smt, pt, ft; + Int_t n1 = test.GetRMS(rt, dyt, st, xt); + pt = Double_t(n1)/n0; + smt = test.GetSyMean(); + // correct position + Double_t dxm= fX0 - xt; + yt = fYref[0] - fYref[1]*dxm; + zt = fZref[0] - fZref[1]*dxm; + // correct tracklet fit for tilt + dyt+= GetTilt()*(zt - zc[idxRow[0]]); + rt += GetTilt() * fZref[1]; + // correct tracklet fit for track position/inclination + dyt= yt - dyt; + rt = (rt - fYref[1])/(1+rt*fYref[1]); + // report inclination in radians + rt = TMath::ATan(rt); + + ft = (n0>=2) ? attach->CookLikelihood(chgPos, lyDet, fPt, phiTrk, n0, dyt/*sRef*/, rt*TMath::RadToDeg(), st/smt) : 0.; + Bool_t kAccept(ft>=fTrklt*(1.-kLikeMinRelDecrease[jr])); + + AliDebug(2, Form("%s seg[%d] row[%2d] n[%2d] dy[%f] r[%+5.2f] s[%+5.2f] f[%f] < %4.2f*F[%f].", + (kAccept?"Adding":"Reject"), its, idxRow[jr], n0, dyt, rt*TMath::RadToDeg(), st/smt, ft, 1.-kLikeMinRelDecrease[jr], fTrklt*(1.-kLikeMinRelDecrease[jr]))); + if(kAccept){ + idxTrklt[kts++] = its; + nTrklt = n0; + fTrklt = ft; + rTrklt = rt; + yTrklt = dyt; + sTrklt = st; + smTrklt= smt; + xTrklt = xt; + pTrklt = pt; + helper.Expand(&clst[ir], index[jr], its); + } } } - - // Select only one cluster/TimeBin - Int_t lastCluster = 0; - fN2 = 0; - for (Int_t iTime = 0; iTime < AliTRDtrackerV1::GetNTimeBins(); iTime++) { - ncl = tboundary[iTime] - lastCluster; - if(!ncl) continue; - Int_t iptr = lastCluster; - if(ncl > 1){ - Float_t dold = 9999.; - for(int ic=lastCluster; icGetY(); - Float_t z = zexp[iTime] - clusters[ic]->GetZ(); - Float_t d = y * y + z * z; - if(d > dold) continue; - dold = d; - iptr = ic; + //========================================================= + // Try attaching next segments from second row (if any) + if(nts[1] && (rcLikelihood = zresRow[0]/zresRow[1]) > kRClikeLimit){ + // organize secondaries in decreasing order of their distance from seed + Int_t jr(1), ir(idxRow[jr]); + memset(dyRez, 0, nts[jr]*sizeof(Double_t)); + Double_t rot(TMath::Tan(r[0][is])); + for(Int_t jts(0); jts kNSgmDy[jr]*smTrklt){ + AliDebug(2, Form("Reject seg[%d] row[%2d] n[%2d] dy[%f] > %d*s[%f].", its, idxRow[jr], n[jr][its], dyRez[its], kNSgmDy[jr], kNSgmDy[jr]*smTrklt)); + continue; + } + + test = helper; + Int_t n0 = test.Expand(&clst[ir], index[jr], its); + Double_t rt, dyt, st, xt, smt, pt, ft; + Int_t n1 = test.GetRMS(rt, dyt, st, xt); + pt = Double_t(n1)/n0; + smt = test.GetSyMean(); + // correct position + Double_t dxm= fX0 - xt; + yt = fYref[0] - fYref[1]*dxm; + zt = fZref[0] - fZref[1]*dxm; + // correct tracklet fit for tilt + dyt+= GetTilt()*(zt - zc[idxRow[0]]); + rt += GetTilt() * fZref[1]; + // correct tracklet fit for track position/inclination + dyt= yt - dyt; + rt = (rt - fYref[1])/(1+rt*fYref[1]); + // report inclination in radians + rt = TMath::ATan(rt); + + ft = (n0>=2) ? attach->CookLikelihood(chgPos, lyDet, fPt, phiTrk, n0, dyt/*sRef*/, rt*TMath::RadToDeg(), st/smt) : 0.; + Bool_t kAccept(ft>=fTrklt*(1.-kLikeMinRelDecrease[jr])); + + AliDebug(2, Form("%s seg[%d] row[%2d] n[%2d] dy[%f] r[%+5.2f] s[%+5.2f] f[%f] < %4.2f*F[%f].", + (kAccept?"Adding":"Reject"), its, idxRow[jr], n0, dyt, rt*TMath::RadToDeg(), st/smt, ft, 1.-kLikeMinRelDecrease[jr], fTrklt*(1.-kLikeMinRelDecrease[jr]))); + if(kAccept){ + idxTrklt[kts++] = its; + nTrklt = n0; + fTrklt = ft; + rTrklt = rt; + yTrklt = dyt; + sTrklt = st; + smTrklt= smt; + xTrklt = xt; + pTrklt = pt; + helper.Expand(&clst[ir], index[jr], its); + SetBit(kRowCross, kTRUE); // mark pad row crossing } } - fIndexes[iTime] = chamber->GetTB(iTime)->GetGlobalIndex(iptr); - fClusters[iTime] = clusters[iptr]; - fY[iTime] = clusters[iptr]->GetY(); - fZ[iTime] = clusters[iptr]->GetZ(); - lastCluster = tboundary[iTime]; - fN2++; } + // clear local copy of clusters + for(Int_t ir(0); irGetRecoParam() ->GetFindableClusters()*AliTRDtrackerV1::GetNTimeBins()); - if (fN2 < kClmin){ - AliWarning(Form("Not enough clusters to fit the tracklet %d [%d].", fN2, kClmin)); - fN2 = 0; + if(!pstreamer && recoParam->GetStreamLevel(AliTRDrecoParam::kTracker) > 1 && fkReconstructor->IsDebugStreaming()) pstreamer = fkReconstructor->GetDebugStream(AliTRDrecoParam::kTracker); + if(pstreamer){ + UChar_t stat(0); + if(IsKink()) SETBIT(stat, 1); + if(IsStandAlone()) SETBIT(stat, 2); + if(IsRowCross()) SETBIT(stat, 3); + TVectorD vidx; vidx.ResizeTo(kts); + for(Int_t its(0); itsGetEntriesFast())){ + AliError("Cluster candidates missing !!!"); + SetErrorMsg(kAttachClAttach); return kFALSE; } - - // update used clusters - fNUsed = 0; - for (Int_t iTime = 0; iTime < AliTRDtrackerV1::GetNTimeBins(); iTime++) { - if(!fClusters[iTime]) continue; - if((fClusters[iTime]->IsUsed())) fNUsed++; + for(Int_t ic(0); icAt(ic))) continue; + Int_t it(c->GetPadTime()), + jr(Int_t(helper.GetRow() != c->GetPadRow())), + idx(it+kNtb*jr); + if(fClusters[idx]){ + AliDebug(1, Form("Multiple clusters/tb for D[%03d] Tb[%02d] Row[%2d]", fDet, it, c->GetPadRow())); + continue; // already booked + } + // TODO proper indexing of clusters !! + fIndexes[idx] = chamber->GetTB(it)->GetGlobalIndex(idxs[idxRow[jr]][ic]); + fClusters[idx] = c; + nc++; } + AliDebug(2, Form("Clusters Found[%2d] Attached[%2d] RC[%c]", nselected, nc, IsRowCross()?'y':'n')); - if (fN2-fNUsed < kClmin){ - AliWarning(Form("Too many clusters already in use %d (from %d).", fNUsed, fN2)); - fN2 = 0; + // number of minimum numbers of clusters expected for the tracklet + if (nc < kClmin){ + AliDebug(1, Form("NOT ENOUGH CLUSTERS %d ATTACHED TO THE TRACKLET [min %d] FROM FOUND %d.", nc, kClmin, ncls)); + SetErrorMsg(kAttachClAttach); return kFALSE; } - + SetN(nc); + + // Load calibration parameters for this tracklet + //Calibrate(); + + // calculate dx for time bins in the drift region (calibration aware) + Float_t x[2] = {0.,0.}; Int_t tb[2]={0,0}; + for (Int_t it = t0, irp=0; irp<2 && it < AliTRDtrackerV1::GetNTimeBins(); it++) { + if(!fClusters[it]) continue; + x[irp] = fClusters[it]->GetX(); + tb[irp] = fClusters[it]->GetLocalTimeBin(); + irp++; + } + Int_t dtb = tb[1] - tb[0]; + fdX = dtb ? (x[0] - x[1]) / dtb : 0.15; return kTRUE; } +//____________________________________________________________ +void AliTRDseedV1::Bootstrap(const AliTRDReconstructor *rec) +{ +// Fill in all derived information. It has to be called after recovery from file or HLT. +// The primitive data are +// - list of clusters +// - detector (as the detector will be removed from clusters) +// - position of anode wire (fX0) - temporary +// - track reference position and direction +// - momentum of the track +// - time bin length [cm] +// +// A.Bercuci Oct 30th 2008 +// + fkReconstructor = rec; + AliTRDgeometry g; + SetPadPlane(g.GetPadPlane(fDet)); + + //fSnp = fYref[1]/TMath::Sqrt(1+fYref[1]*fYref[1]); + //fTgl = fZref[1]; + Int_t n = 0, nshare = 0, nused = 0; + AliTRDcluster **cit = &fClusters[0]; + for(Int_t ic = kNclusters; ic--; cit++){ + if(!(*cit)) return; + n++; + if((*cit)->IsShared()) nshare++; + if((*cit)->IsUsed()) nused++; + } + SetN(n); SetNUsed(nused); SetNShared(nshare); + Fit(); + CookLabels(); + GetProbability(); +} + + //____________________________________________________________________ -Bool_t AliTRDseedV1::Fit(Bool_t tilt) +Bool_t AliTRDseedV1::Fit(UChar_t opt) { - // - // Linear fit of the tracklet - // - // Parameters : - // - // Output : - // True if successful - // - // Detailed description - // 2. Check if tracklet crosses pad row boundary - // 1. Calculate residuals in the y (r-phi) direction - // 3. Do a Least Square Fit to the data - // +// +// Linear fit of the clusters attached to the tracklet +// +// Parameters : +// - opt : switch for tilt pad correction of cluster y position. Options are +// 0 no correction [default] +// 1 full tilt correction [dz/dx and z0] +// 2 pseudo tilt correction [dz/dx from pad-chamber geometry] +// +// Output : +// True if successful +// +// Detailed description +// +// Fit in the xy plane +// +// The fit is performed to estimate the y position of the tracklet and the track +// angle in the bending plane. The clusters are represented in the chamber coordinate +// system (with respect to the anode wire - see AliTRDtrackerV1::FollowBackProlongation() +// on how this is set). The x and y position of the cluster and also their variances +// are known from clusterizer level (see AliTRDcluster::GetXloc(), AliTRDcluster::GetYloc(), +// AliTRDcluster::GetSX() and AliTRDcluster::GetSY()). +// If gaussian approximation is used to calculate y coordinate of the cluster the position +// is recalculated taking into account the track angle. The general formula to calculate the +// error of cluster position in the gaussian approximation taking into account diffusion and track +// inclination is given for TRD by: +// BEGIN_LATEX +// #sigma^{2}_{y} = #sigma^{2}_{PRF} + #frac{x#delta_{t}^{2}}{(1+tg(#alpha_{L}))^{2}} + #frac{x^{2}tg^{2}(#phi-#alpha_{L})tg^{2}(#alpha_{L})}{12} +// END_LATEX +// +// Since errors are calculated only in the y directions, radial errors (x direction) are mapped to y +// by projection i.e. +// BEGIN_LATEX +// #sigma_{x|y} = tg(#phi) #sigma_{x} +// END_LATEX +// and also by the lorentz angle correction +// +// Fit in the xz plane +// +// The "fit" is performed to estimate the radial position (x direction) where pad row cross happens. +// If no pad row crossing the z position is taken from geometry and radial position is taken from the xy +// fit (see below). +// +// There are two methods to estimate the radial position of the pad row cross: +// 1. leading cluster radial position : Here the lower part of the tracklet is considered and the last +// cluster registered (at radial x0) on this segment is chosen to mark the pad row crossing. The error +// of the z estimate is given by : +// BEGIN_LATEX +// #sigma_{z} = tg(#theta) #Delta x_{x_{0}}/12 +// END_LATEX +// The systematic errors for this estimation are generated by the following sources: +// - no charge sharing between pad rows is considered (sharp cross) +// - missing cluster at row cross (noise peak-up, under-threshold signal etc.). +// +// 2. charge fit over the crossing point : Here the full energy deposit along the tracklet is considered +// to estimate the position of the crossing by a fit in the qx plane. The errors in the q directions are +// parameterized as s_q = q^2. The systematic errors for this estimation are generated by the following sources: +// - no general model for the qx dependence +// - physical fluctuations of the charge deposit +// - gain calibration dependence +// +// Estimation of the radial position of the tracklet +// +// For pad row cross the radial position is taken from the xz fit (see above). Otherwise it is taken as the +// interpolation point of the tracklet i.e. the point where the error in y of the fit is minimum. The error +// in the y direction of the tracklet is (see AliTRDseedV1::GetCovAt()): +// BEGIN_LATEX +// #sigma_{y} = #sigma^{2}_{y_{0}} + 2xcov(y_{0}, dy/dx) + #sigma^{2}_{dy/dx} +// END_LATEX +// and thus the radial position is: +// BEGIN_LATEX +// x = - cov(y_{0}, dy/dx)/#sigma^{2}_{dy/dx} +// END_LATEX +// +// Estimation of tracklet position error +// +// The error in y direction is the error of the linear fit at the radial position of the tracklet while in the z +// direction is given by the cluster error or pad row cross error. In case of no pad row cross this is given by: +// BEGIN_LATEX +// #sigma_{y} = #sigma^{2}_{y_{0}} - 2cov^{2}(y_{0}, dy/dx)/#sigma^{2}_{dy/dx} + #sigma^{2}_{dy/dx} +// #sigma_{z} = Pad_{length}/12 +// END_LATEX +// For pad row cross the full error is calculated at the radial position of the crossing (see above) and the error +// in z by the width of the crossing region - being a matter of parameterization. +// BEGIN_LATEX +// #sigma_{z} = tg(#theta) #Delta x_{x_{0}}/12 +// END_LATEX +// In case of no tilt correction (default in the barrel tracking) the tilt is taken into account by the rotation of +// the covariance matrix. See AliTRDseedV1::GetCovAt() for details. +// +// Author +// A.Bercuci - const Int_t kClmin = 8; - const Float_t q0 = 100.; - const Float_t clSigma0 = 2.E-2; //[cm] - const Float_t clSlopeQ = -1.19E-2; //[1/cm] + if(!fkReconstructor){ + AliError("The tracklet needs the reconstruction setup. Please initialize by SetReconstructor()."); + return kFALSE; + } + if(!IsCalibrated()) Calibrate(); + if(opt>2){ + AliWarning(Form("Option [%d] outside range [0, 2]. Using default",opt)); + opt=0; + } + const Int_t kClmin = 8; + const Float_t kScalePulls = 10.; // factor to scale y pulls - NOT UNDERSTOOD // get track direction Double_t y0 = fYref[0]; Double_t dydx = fYref[1]; Double_t z0 = fZref[0]; Double_t dzdx = fZref[1]; - Double_t yt, zt; - const Int_t kNtb = AliTRDtrackerV1::GetNTimeBins(); - AliTRDtrackerV1::AliTRDLeastSquare fitterY, fitterZ; + AliTRDtrackerV1::AliTRDLeastSquare fitterY; + AliTRDtrackerV1::AliTRDLeastSquare fitterZ; - // convertion factor from square to gauss distribution for sigma - Double_t convert = 1./TMath::Sqrt(12.); - // book cluster information - Double_t xc[knTimebins], yc[knTimebins], zc[knTimebins], sy[knTimebins], sz[knTimebins]; - Int_t zRow[knTimebins]; - - - fN = 0; - AliTRDcluster *c=0x0, **jc = &fClusters[0]; - for (Int_t ic=0; icGetRecoParam(); //the dynamic cast in GetRecoParam is slow, so caching the pointer to it + + const Char_t *tcName[]={"NONE", "FULL", "HALF"}; + AliDebug(2, Form("Options : TC[%s] dzdx[%c]", tcName[opt], kDZDX?'Y':'N')); + + + for (Int_t ic=0; icIsInChamber()) continue; + // compute pseudo tilt correction + if(kDZDX){ + fZfit[0] = c->GetZ(); + if(rc){ + for(Int_t kc=AliTRDseedV1::kNtb; kcIsInChamber()) continue; + fZfit[0] += cc->GetZ(); fZfit[0] *= 0.5; + break; + } + } + fZfit[1] = fZfit[0]/fX0; + if(rc){ + fZfit[0] += fZfit[1]*0.5*AliTRDgeometry::CdrHght(); + fZfit[1] = fZfit[0]/fX0; + } + kDZDX=kFALSE; + } + Float_t w = 1.; if(c->GetNPads()>4) w = .5; if(c->GetNPads()>5) w = .2; - zRow[fN] = c->GetPadRow(); - xc[fN] = fX0 - c->GetX(); - yc[fN] = c->GetY(); - zc[fN] = c->GetZ(); - - // extrapolated y value for the track - yt = y0 - xc[fN]*dydx; - // extrapolated z value for the track - zt = z0 - xc[fN]*dzdx; - // tilt correction - if(tilt) yc[fN] -= fTilt*(zc[fN] - zt); - - // elaborate cluster error - Float_t qr = c->GetQ() - q0; - sy[fN] = qr < 0. ? clSigma0*TMath::Exp(clSlopeQ*qr) : clSigma0; - fitterY.AddPoint(&xc[fN], yc[fN]-yt, sy[fN]); - - sz[fN] = fPadLength*convert; - fitterZ.AddPoint(&xc[fN], zc[fN], sz[fN]); - fN++; + // cluster charge + qc[n] = TMath::Abs(c->GetQ()); + // pad row of leading + + xc[n] = fX0 - c->GetX(); + + // Recalculate cluster error based on tracking information + c->SetSigmaY2(fS2PRF, fDiffT, fExB, xc[n], -1./*zcorr?zt:-1.*/, dydx); + c->SetSigmaZ2(fPad[0]*fPad[0]/12.); // for HLT + sy[n] = TMath::Sqrt(c->GetSigmaY2()); + + yc[n] = recoParam->UseGAUS() ? + c->GetYloc(y0, sy[n], GetPadWidth()): c->GetY(); + zc[n] = c->GetZ(); + + //optional r-phi correction + //printf(" n[%2d] yc[%7.5f] ", n, yc[n]); + Float_t correction(0.); + if(tilt) correction = fPad[2]*(xc[n]*dzdx + zc[n] - z0); + else if(pseudo) correction = fPad[2]*(xc[n]*fZfit[1] + zc[n]-fZfit[0]); + yc[n]-=correction; + //printf("corr(%s%s)[%7.5f] yc1[%7.5f]\n", (tilt?"TC":""), (zcorr?"PC":""), correction, yc[n]); + + AliDebug(5, Form(" tb[%2d] dx[%6.3f] y[%6.2f+-%6.3f]", c->GetLocalTimeBin(), xc[n], yc[n], sy[n])); + fitterY.AddPoint(&xc[n], yc[n], sy[n]); + if(rc) fitterZ.AddPoint(&xc[n], qc[n]*(ic2) return kFALSE; - - - // determine z offset of the fit - Float_t zslope = 0.; - Int_t nchanges = 0, nCross = 0; - if(nz==2){ // tracklet is crossing pad row - // Find the break time allowing one chage on pad-rows - // with maximal number of accepted clusters - Int_t padRef = zRow[0]; - for (Int_t ic=1; ic zc[ic] ? 1. : -1.; - padRef = zRow[ic]; - nCross = ic; - nchanges++; + if (n < kClmin){ + AliDebug(1, Form("Not enough clusters to fit. Clusters: Attached[%d] Fit[%d].", GetN(), n)); + SetErrorMsg(kFitCl); + return kFALSE; + } + // fit XY + if(!fitterY.Eval()){ + AliDebug(1, "Fit Y failed."); + SetErrorMsg(kFitFailedY); + return kFALSE; + } + fYfit[0] = fitterY.GetFunctionParameter(0); + fYfit[1] = -fitterY.GetFunctionParameter(1); + // store covariance + Double_t p[3]; + fitterY.GetCovarianceMatrix(p); + fCov[0] = kScalePulls*p[1]; // variance of y0 + fCov[1] = kScalePulls*p[2]; // covariance of y0, dydx + fCov[2] = kScalePulls*p[0]; // variance of dydx + // the ref radial position is set at the minimum of + // the y variance of the tracklet + fX = -fCov[1]/fCov[2]; + fS2Y = fCov[0] +2.*fX*fCov[1] + fX*fX*fCov[2]; + + Float_t xs=fX+.5*AliTRDgeometry::CamHght(); + if(xs < 0. || xs > AliTRDgeometry::CamHght()+AliTRDgeometry::CdrHght()){ + AliDebug(1, Form("Ref radial position ouside chamber x[%5.2f].", fX)); + SetErrorMsg(kFitFailedY); + return kFALSE; + } + +/* // THE LEADING CLUSTER METHOD for z fit + Float_t xMin = fX0; + Int_t ic=n=kNclusters-1; jc = &fClusters[ic]; + AliTRDcluster *c0 =0x0, **kc = &fClusters[kNtb-1]; + for(; ic>kNtb; ic--, --jc, --kc){ + if((c0 = (*kc)) && c0->IsInChamber() && (xMin>c0->GetX())) xMin = c0->GetX(); + if(!(c = (*jc))) continue; + if(!c->IsInChamber()) continue; + zc[kNclusters-1] = c->GetZ(); + fX = fX0 - c->GetX(); + } + fZfit[0] = .5*(zc[0]+zc[kNclusters-1]); fZfit[1] = 0.; + // Error parameterization + fS2Z = fdX*fZref[1]; + fS2Z *= fS2Z; fS2Z *= 0.2887; // 1/sqrt(12)*/ + + // fit QZ + if(opt!=1 && IsRowCross()){ + if(!fitterZ.Eval()) SetErrorMsg(kFitFailedZ); + if(!HasError(kFitFailedZ) && TMath::Abs(fitterZ.GetFunctionParameter(1))>1.e-10){ + // TODO - one has to recalculate xy fit based on + // better knowledge of z position +// Double_t x = -fitterZ.GetFunctionParameter(0)/fitterZ.GetFunctionParameter(1); +// Double_t z0 = .5*(zc[0]+zc[n-1]); +// fZfit[0] = z0 + fZfit[1]*x; +// fZfit[1] = fZfit[0]/fX0; +// redo fit on xy plane } + // temporary external error parameterization + fS2Z = 0.05+0.4*TMath::Abs(fZref[1]); fS2Z *= fS2Z; + // TODO correct formula + //fS2Z = sigma_x*TMath::Abs(fZref[1]); + } else { + //fZfit[0] = zc[0] + dzdx*0.5*AliTRDgeometry::CdrHght(); + fS2Z = GetPadLength()*GetPadLength()/12.; } + return kTRUE; +} - // condition on nCross and reset nchanges TODO - if(nchanges==1){ - if(dzdx * zslope < 0.){ - AliInfo("tracklet direction does not correspond to the track direction. TODO."); +//____________________________________________________________________ +Bool_t AliTRDseedV1::FitRobust(Bool_t chg) +{ +// +// Linear fit of the clusters attached to the tracklet +// +// Author +// A.Bercuci + + TTreeSRedirector *pstreamer(NULL); + const AliTRDrecoParam* const recoParam = fkReconstructor->GetRecoParam(); if(recoParam->GetStreamLevel(AliTRDrecoParam::kTracker) > 3 && fkReconstructor->IsDebugStreaming()) pstreamer = fkReconstructor->GetDebugStream(AliTRDrecoParam::kTracker); + + // factor to scale y pulls. + // ideally if error parametrization correct this is 1. + //Float_t lyScaler = 1./(AliTRDgeometry::GetLayer(fDet)+1.); + Float_t kScalePulls = 1.; + AliTRDcalibDB *calibration = AliTRDcalibDB::Instance(); + if(!calibration){ + AliWarning("No access to calibration data"); + } else { + // Retrieve the CDB container class with the parametric likelihood + const AliTRDCalTrkAttach *attach = calibration->GetAttachObject(); + if(!attach){ + AliWarning("No usable AttachClusters calib object."); + } else { + kScalePulls = attach->GetScaleCov();//*lyScaler; } - SetBit(kRowCross, kTRUE); // mark pad row crossing - fitterZ.AddPoint(&fCross[0], fCross[2], fCross[3]); - fitterZ.Eval(); - //zc[nc] = fitterZ.GetFunctionParameter(0); - fCross[1] = fYfit[0] - fCross[0] * fYfit[1]; - fCross[0] = fX0 - fCross[0]; - } else if(nchanges > 1){ // debug - AliError("N pad row crossing > 1."); - return kFALSE; + } + Double_t xc[kNclusters], yc[kNclusters], sy[kNclusters]; + Int_t n(0), // clusters used in fit + row[]={-1, 0}; // pad row spanned by the tracklet + AliTRDcluster *c(NULL), **jc = &fClusters[0]; + for(Int_t ic=0; icIsInChamber()) continue; + if(row[0]<0){ + fZfit[0] = c->GetZ(); + fZfit[1] = 0.; + row[0] = c->GetPadRow(); + } + xc[n] = fX0 - c->GetX(); + yc[n] = c->GetY(); + sy[n] = c->GetSigmaY2()>0?(TMath::Min(TMath::Sqrt(c->GetSigmaY2()), 0.08)):0.08; + n++; } + Double_t corr = fPad[2]*fPad[0]; - UpdateUsed(); - + for(Int_t ic=kNtb; icIsInChamber()) continue; + if(row[1]==0) row[1] = c->GetPadRow() - row[0]; + xc[n] = fX0 - c->GetX(); + yc[n] = c->GetY() + corr*row[1]; + sy[n] = c->GetSigmaY2()>0?(TMath::Min(TMath::Sqrt(c->GetSigmaY2()), 0.08)):0.08; + n++; + } + UChar_t status(0); + Double_t par[3] = {0.,0.,21122012.}, cov[3]; + if(!AliTRDtrackletOflHelper::Fit(n, xc, yc, sy, par, 1.5, cov)){ + AliDebug(1, Form("Tracklet fit failed D[%03d].", fDet)); + SetErrorMsg(kFitCl); + return kFALSE; + } + fYfit[0] = par[0]; + fYfit[1] = -par[1]; + // store covariance + fCov[0] = kScalePulls*cov[0]; // variance of y0 + fCov[1] = kScalePulls*cov[2]; // covariance of y0, dydx + fCov[2] = kScalePulls*cov[1]; // variance of dydx + // the ref radial position is set at the minimum of + // the y variance of the tracklet + fX = -fCov[1]/fCov[2]; + // check radial position + Float_t xs=fX+.5*AliTRDgeometry::CamHght(); + if(xs < 0. || xs > AliTRDgeometry::CamHght()+AliTRDgeometry::CdrHght()){ + AliDebug(1, Form("Ref radial position x[%5.2f] ouside D[%3d].", fX, fDet)); + SetErrorMsg(kFitFailedY); + return kFALSE; + } + fS2Y = fCov[0] + fX*fCov[1]; + fS2Z = fPad[0]*fPad[0]/12.; + AliDebug(2, Form("[I] x[cm]=%6.2f y[cm]=%+5.2f z[cm]=%+6.2f dydx[deg]=%+5.2f sy[um]=%6.2f sz[cm]=%6.2f", GetX(), GetY(), GetZ(), TMath::ATan(fYfit[1])*TMath::RadToDeg(), TMath::Sqrt(fS2Y)*1.e4, TMath::Sqrt(fS2Z))); + if(IsRowCross()){ + Float_t x,z; + if(!GetEstimatedCrossPoint(x,z)){ + AliDebug(2, Form("Failed getting crossing point D[%03d].", fDet)); + SetErrorMsg(kFitFailedY); + return kTRUE; + } + fX = fX0-x; + fS2Y = fCov[0] + fX*fCov[1]; + fZfit[0] = z; + if(IsPrimary()){ + fZfit[1] = z/x; + fS2Z = 0.05+0.4*TMath::Abs(fZfit[1]); fS2Z *= fS2Z; + } + AliDebug(2, Form("[II] x[cm]=%6.2f y[cm]=%+5.2f z[cm]=%+6.2f dydx[deg]=%+5.2f sy[um]=%6.2f sz[um]=%6.2f dzdx[deg]=%+5.2f", GetX(), GetY(), GetZ(), TMath::ATan(fYfit[1])*TMath::RadToDeg(), TMath::Sqrt(fS2Y)*1.e4, TMath::Sqrt(fS2Z)*1.e4, TMath::ATan(fZfit[1])*TMath::RadToDeg())); + } + + if(pstreamer){ + Float_t x= fX0 -fX, + y = GetY(), + yt = fYref[0]-fX*fYref[1]; + SETBIT(status, 2); + TVectorD vcov(3); vcov[0]=cov[0];vcov[1]=cov[1];vcov[2]=cov[2]; + Double_t sm(0.), chi2(0.), tmp, dy[kNclusters]; + for(Int_t ic(0); icGetX(), (*jc)->GetY(), (*jc)->GetZ(), - fIndexes[ic], (void*)(*jc), fUsable[ic]?"y":"n"); - } - - printf(" fYref[0] =%f fYref[1] =%f\n", fYref[0], fYref[1]); - printf(" fZref[0] =%f fZref[1] =%f\n", fZref[0], fZref[1]); - printf(" fYfit[0] =%f fYfit[1] =%f\n", fYfit[0], fYfit[1]); - printf(" fZfit[0] =%f fZfit[1] =%f\n", fZfit[0], fZfit[1]); - printf(" fSigmaY =%f\n", fSigmaY); - printf(" fSigmaY2=%f\n", fSigmaY2); - printf(" fMeanz =%f\n", fMeanz); - printf(" fZProb =%f\n", fZProb); - printf(" fLabels[0]=%d fLabels[1]=%d\n", fLabels[0], fLabels[1]); - printf(" fN =%d\n", fN); - printf(" fN2 =%d (>4 isOK - to be redesigned)\n",fN2); - printf(" fNUsed =%d\n", fNUsed); - printf(" fFreq =%d\n", fFreq); - printf(" fNChange=%d\n", fNChange); - printf(" fMPads =%f\n", fMPads); + (*jc)->Print(o); + } +} + + +//___________________________________________________________________ +Bool_t AliTRDseedV1::IsEqual(const TObject *o) const +{ + // Checks if current instance of the class has the same essential members + // as the given one + + if(!o) return kFALSE; + const AliTRDseedV1 *inTracklet = dynamic_cast(o); + if(!inTracklet) return kFALSE; + + for (Int_t i = 0; i < 2; i++){ + if ( fYref[i] != inTracklet->fYref[i] ) return kFALSE; + if ( fZref[i] != inTracklet->fZref[i] ) return kFALSE; + } + + if ( TMath::Abs(fS2Y - inTracklet->fS2Y)>1.e-10 ) return kFALSE; + if ( TMath::Abs(GetTilt() - inTracklet->GetTilt())>1.e-10 ) return kFALSE; + if ( TMath::Abs(GetPadLength() - inTracklet->GetPadLength())>1.e-10 ) return kFALSE; + + for (Int_t i = 0; i < kNclusters; i++){ +// if ( fX[i] != inTracklet->GetX(i) ) return kFALSE; +// if ( fY[i] != inTracklet->GetY(i) ) return kFALSE; +// if ( fZ[i] != inTracklet->GetZ(i) ) return kFALSE; + if ( fIndexes[i] != inTracklet->fIndexes[i] ) return kFALSE; + } +// if ( fUsable != inTracklet->fUsable ) return kFALSE; + + for (Int_t i=0; i < 2; i++){ + if ( fYfit[i] != inTracklet->fYfit[i] ) return kFALSE; + if ( fZfit[i] != inTracklet->fZfit[i] ) return kFALSE; + if ( fLabels[i] != inTracklet->fLabels[i] ) return kFALSE; + } + +/* if ( fMeanz != inTracklet->GetMeanz() ) return kFALSE; + if ( fZProb != inTracklet->GetZProb() ) return kFALSE;*/ + if ( fN != inTracklet->fN ) return kFALSE; + //if ( fNUsed != inTracklet->fNUsed ) return kFALSE; + //if ( fFreq != inTracklet->GetFreq() ) return kFALSE; + //if ( fNChange != inTracklet->GetNChange() ) return kFALSE; + + if ( TMath::Abs(fC[0] - inTracklet->fC[0])>1.e-10 ) return kFALSE; + //if ( fCC != inTracklet->GetCC() ) return kFALSE; + if ( TMath::Abs(fChi2 - inTracklet->fChi2)>1.e-10 ) return kFALSE; + // if ( fChi2Z != inTracklet->GetChi2Z() ) return kFALSE; + + if ( fDet != inTracklet->fDet ) return kFALSE; + if ( TMath::Abs(fPt - inTracklet->fPt)>1.e-10 ) return kFALSE; + if ( TMath::Abs(fdX - inTracklet->fdX)>1.e-10 ) return kFALSE; - printf(" fC =%f\n", fC); - printf(" fCC =%f\n",fCC); - printf(" fChi2 =%f\n", fChi2); - printf(" fChi2Z =%f\n", fChi2Z); + for (Int_t iCluster = 0; iCluster < kNclusters; iCluster++){ + AliTRDcluster *curCluster = fClusters[iCluster]; + AliTRDcluster *inCluster = inTracklet->fClusters[iCluster]; + if (curCluster && inCluster){ + if (! curCluster->IsEqual(inCluster) ) { + curCluster->Print(); + inCluster->Print(); + return kFALSE; + } + } else { + // if one cluster exists, and corresponding + // in other tracklet doesn't - return kFALSE + if(curCluster || inCluster) return kFALSE; + } + } + return kTRUE; }