/************************************************************************** * Copyright(c) 1998-1999, ALICE Experiment at CERN, All rights reserved. * * * * Author: The ALICE Off-line Project. * * Contributors are mentioned in the code where appropriate. * * * * Permission to use , copy, modify and distribute this software and its * * documentation strictly for non-commercial purposes is hereby granted * * without fee, provided that the above copyright notice appears in all * * copies and that both the copyright notice and this permission notice * * appear in the supporting documentation. The authors make no claims * * about the suitability of this software for any purpose. It is * * provided "as is" without express or implied warranty. * **************************************************************************/ /* $Id$ */ #include #include #include #include "AliTracker.h" #include "AliESDtrack.h" #include "AliTRDgeometry.h" #include "AliTRDcluster.h" #include "AliTRDtrack.h" #include "AliTRDtracklet.h" // A. Bercuci - used for PID calculations #include "AliTRDcalibDB.h" #include "Cal/AliTRDCalPID.h" ClassImp(AliTRDtrack) /////////////////////////////////////////////////////////////////////////////// // // // Represents a reconstructed TRD track // // Local TRD Kalman track // // // /////////////////////////////////////////////////////////////////////////////// //_____________________________________________________________________________ AliTRDtrack::AliTRDtrack() :AliKalmanTrack() ,fSeedLab(-1) ,fdEdx(0) ,fDE(0) ,fClusterOwner(kFALSE) ,fStopped(kFALSE) ,fLhElectron(0) ,fNWrong(0) ,fNRotate(0) ,fNCross(0) ,fNExpected(0) ,fNLast(0) ,fNExpectedLast(0) ,fNdedx(0) ,fChi2Last(1e10) ,fBackupTrack(0x0) { // // AliTRDtrack default constructor // for (Int_t i = 0; i < kNplane; i++) { for (Int_t j = 0; j < kNslice; j++) { fdEdxPlane[i][j] = 0.0; } fTimBinPlane[i] = -1; // A.Bercuci additions fMom[i] = -1.; fSnp[i] = 0.; fTgl[i] = 0.; } for (UInt_t i = 0; i < kMAXCLUSTERSPERTRACK; i++) { fIndex[i] = 0; fIndexBackup[i] = 0; fdQdl[i] = 0; //A.Bercuci additions fClusters[i] = 0x0; } for (Int_t i = 0; i < 3; i++) { fBudget[i] = 0; } } //_____________________________________________________________________________ AliTRDtrack::AliTRDtrack(AliTRDcluster *c, Int_t index , const Double_t p[5], const Double_t cov[15] , Double_t x, Double_t alpha) :AliKalmanTrack() ,fSeedLab(-1) ,fdEdx(0) ,fDE(0) ,fClusterOwner(kFALSE) ,fStopped(kFALSE) ,fLhElectron(0) ,fNWrong(0) ,fNRotate(0) ,fNCross(0) ,fNExpected(0) ,fNLast(0) ,fNExpectedLast(0) ,fNdedx(0) ,fChi2Last(1e10) ,fBackupTrack(0x0) { // // The main AliTRDtrack constructor. // Double_t cnv = 1.0/(GetBz() * kB2C); Double_t pp[5] = { p[0] , p[1] , x*p[4] - p[2] , p[3] , p[4]*cnv }; Double_t c22 = x*x*cov[14] - 2*x*cov[12] + cov[5]; Double_t c32 = x*cov[13] - cov[8]; Double_t c20 = x*cov[10] - cov[3]; Double_t c21 = x*cov[11] - cov[4]; Double_t c42 = x*cov[14] - cov[12]; Double_t cc[15] = { cov[0 ] , cov[1 ], cov[2 ] , c20, c21, c22 , cov[6 ], cov[7 ], c32, cov[9 ] , cov[10]*cnv, cov[11]*cnv, c42*cnv, cov[13]*cnv, cov[14]*cnv*cnv }; Set(x,alpha,pp,cc); SetNumberOfClusters(1); fIndex[0] = index; fClusters[0] = c; // A.Bercuci additions for (Int_t i = 0; i < kNplane; i++) { for (Int_t j = 0; j < kNslice; j++) { fdEdxPlane[i][j] = 0.0; } fTimBinPlane[i] = -1; // A.Bercuci additions fMom[i] = -1.; fSnp[i] = 0.; fTgl[i] = 0.; } Double_t q = TMath::Abs(c->GetQ()); Double_t s = GetSnp(); Double_t t = GetTgl(); if (s*s < 1) { q *= TMath::Sqrt((1-s*s)/(1+t*t)); } fdQdl[0] = q; for (UInt_t i = 1; i < kMAXCLUSTERSPERTRACK; i++) { fdQdl[i] = 0; fIndex[i] = 0; fIndexBackup[i] = 0; // A.Bercuci additions fClusters[i] = 0x0; } for (Int_t i = 0; i < 3;i++) { fBudget[i] = 0; } } //_____________________________________________________________________________ AliTRDtrack::AliTRDtrack(const AliTRDtrack &t/*, const Bool_t owner*/) :AliKalmanTrack(t) ,fSeedLab(t.GetSeedLabel()) ,fdEdx(t.fdEdx) ,fDE(t.fDE) ,fClusterOwner(kTRUE) ,fStopped(t.fStopped) ,fLhElectron(0) ,fNWrong(t.fNWrong) ,fNRotate(t.fNRotate) ,fNCross(t.fNCross) ,fNExpected(t.fNExpected) ,fNLast(t.fNLast) ,fNExpectedLast(t.fNExpectedLast) ,fNdedx(t.fNdedx) ,fChi2Last(t.fChi2Last) ,fBackupTrack(0x0) { // // Copy constructor. // for (Int_t i = 0; i < kNplane; i++) { for (Int_t j = 0; j < kNslice; j++) { fdEdxPlane[i][j] = t.fdEdxPlane[i][j]; } fTimBinPlane[i] = t.fTimBinPlane[i]; fTracklets[i] = t.fTracklets[i]; // A.Bercuci additions fMom[i] = t.fMom[i]; fSnp[i] = t.fSnp[i]; fTgl[i] = t.fTgl[i]; } Int_t n = t.GetNumberOfClusters(); SetNumberOfClusters(n); for (Int_t i = 0; i < n; i++) { fIndex[i] = t.fIndex[i]; fIndexBackup[i] = t.fIndex[i]; fdQdl[i] = t.fdQdl[i]; // A.Bercuci additions if(fClusterOwner && t.fClusters[i]) fClusters[i] = new AliTRDcluster(*(t.fClusters[i])); else fClusters[i] = t.fClusters[i]; } for (UInt_t i = n; i < kMAXCLUSTERSPERTRACK; i++) { fdQdl[i] = 0; fIndex[i] = 0; fIndexBackup[i] = 0; // A.Bercuci additions fClusters[i] = 0x0; } for (Int_t i = 0; i < 3;i++) { fBudget[i] = t.fBudget[i]; } } //_____________________________________________________________________________ AliTRDtrack::AliTRDtrack(const AliKalmanTrack &t, Double_t /*alpha*/) :AliKalmanTrack(t) ,fSeedLab(-1) ,fdEdx(t.GetPIDsignal()) ,fDE(0) ,fClusterOwner(kFALSE) ,fStopped(kFALSE) ,fLhElectron(0.0) ,fNWrong(0) ,fNRotate(0) ,fNCross(0) ,fNExpected(0) ,fNLast(0) ,fNExpectedLast(0) ,fNdedx(0) ,fChi2Last(0.0) ,fBackupTrack(0x0) { // // Constructor from AliTPCtrack or AliITStrack // SetLabel(t.GetLabel()); SetChi2(0.0); SetMass(t.GetMass()); SetNumberOfClusters(0); for (Int_t i = 0; i < kNplane; i++) { for (Int_t j = 0; j < kNslice; j++) { fdEdxPlane[i][j] = 0.0; } fTimBinPlane[i] = -1; // A.Bercuci additions fMom[i] = -1.; fSnp[i] = 0.; fTgl[i] = 0.; } for (UInt_t i = 0; i < kMAXCLUSTERSPERTRACK; i++) { fdQdl[i] = 0; fIndex[i] = 0; fIndexBackup[i] = 0; // A.Bercuci additions fClusters[i] = 0x0; } for (Int_t i = 0; i < 3; i++) { fBudget[i] = 0; } } //_____________________________________________________________________________ AliTRDtrack::AliTRDtrack(const AliESDtrack &t) :AliKalmanTrack() ,fSeedLab(-1) ,fdEdx(t.GetTRDsignal()) ,fDE(0) ,fClusterOwner(kFALSE) ,fStopped(kFALSE) ,fLhElectron(0) ,fNWrong(0) ,fNRotate(0) ,fNCross(0) ,fNExpected(0) ,fNLast(0) ,fNExpectedLast(0) ,fNdedx(0) ,fChi2Last(1e10) ,fBackupTrack(0x0) { // // Constructor from AliESDtrack // SetLabel(t.GetLabel()); SetChi2(0.0); SetMass(t.GetMass()); SetNumberOfClusters(t.GetTRDclusters(fIndex)); Int_t ncl = t.GetTRDclusters(fIndexBackup); for (UInt_t i = ncl; i < kMAXCLUSTERSPERTRACK; i++) { fIndexBackup[i] = 0; fIndex[i] = 0; } for (Int_t i = 0; i < kNplane; i++) { for (Int_t j = 0; j < kNslice; j++) { fdEdxPlane[i][j] = t.GetTRDsignals(i,j); } fTimBinPlane[i] = t.GetTRDTimBin(i); // A.Bercuci additions fMom[i] = -1.; fSnp[i] = 0.; fTgl[i] = 0.; } const AliExternalTrackParam *par = &t; if (t.GetStatus() & AliESDtrack::kTRDbackup) { par = t.GetOuterParam(); if (!par) { AliError("No backup info!"); par = &t; } } Set(par->GetX(),par->GetAlpha(),par->GetParameter(),par->GetCovariance()); for (UInt_t i = 0; i < kMAXCLUSTERSPERTRACK; i++) { fdQdl[i] = 0; // A.Bercuci additions fClusters[i] = 0x0; } for (Int_t i = 0; i < 3; i++) { fBudget[i] = 0; } if ((t.GetStatus() & AliESDtrack::kTIME) == 0) { return; } StartTimeIntegral(); Double_t times[10]; t.GetIntegratedTimes(times); SetIntegratedTimes(times); SetIntegratedLength(t.GetIntegratedLength()); } //____________________________________________________________________________ AliTRDtrack::~AliTRDtrack() { // // Destructor // if (fBackupTrack) { delete fBackupTrack; } fBackupTrack = 0x0; if (fClusterOwner){ UInt_t icluster=0; while(icluster 110) && (fChi2/(Float_t(fN)) < 3)) return 3; // Gold if ((fNLast > 30) && (fChi2Last/(Float_t(fNLast)) < 3)) return 3; // Gold if ((fNLast > 20) && (fChi2Last/(Float_t(fNLast)) < 2)) return 3; // Gold if ((fNLast/(fNExpectedLast+3.0) > 0.8) && (fChi2Last/Float_t(fNLast) < 5) && (fNLast > 20)) return 2; // Silber if ((fNLast > 5) && (((fNLast+1.0)/(fNExpectedLast+1.0)) > 0.8) && (fChi2Last/(fNLast-5.0) < 6)) return 1; return status; } //_____________________________________________________________________________ Int_t AliTRDtrack::Compare(const TObject *o) const { // // Compares tracks according to their Y2 or curvature // AliTRDtrack *t = (AliTRDtrack *) o; Double_t co = TMath::Abs(t->GetC()); Double_t c = TMath::Abs(GetC()); if (c > co) { return 1; } else if (c < co) { return -1; } return 0; } //_____________________________________________________________________________ void AliTRDtrack::CookdEdx(Double_t low, Double_t up) { // // Calculates the truncated dE/dx within the "low" and "up" cuts. // // Array to sort the dEdx values according to amplitude Float_t sorted[kMAXCLUSTERSPERTRACK]; fdEdx = 0.; // Require at least 10 clusters for a dedx measurement if (fNdedx < 10) return; // Can fdQdl be negative ???? for (Int_t i = 0; i < fNdedx; i++) sorted[i] = TMath::Abs(fdQdl[i]); // Sort the dedx values by amplitude Int_t *index = new Int_t[fNdedx]; TMath::Sort(fNdedx, sorted, index, kFALSE); // Sum up the truncated charge between lower and upper bounds Int_t nl = Int_t(low * fNdedx); Int_t nu = Int_t( up * fNdedx); for (Int_t i = nl; i <= nu; i++) fdEdx += sorted[index[i]]; fdEdx /= (nu - nl + 1.0); delete[] index; } //_____________________________________________________________________________ void AliTRDtrack::CookdEdxTimBin() { // // Set fdEdxPlane and fTimBinPlane and also get the // Time bin for Max. Cluster // // Authors: // Prashant Shukla (shukla@physi.uni-heidelberg.de) // Alexandru Bercuci (A.Bercuci@gsi.de) Double_t maxcharge[AliESDtrack::kNPlane]; // max charge in chamber // number of clusters attached to track per chamber and slice Int_t nCluster[AliESDtrack::kNPlane][AliESDtrack::kNSlice]; //number of time bins in chamber Int_t ntb = AliTRDcalibDB::Instance()->GetNumberOfTimeBins(); Int_t plane; // plane of current cluster Int_t tb; // time bin of current cluster Int_t slice; // curent slice AliTRDcluster *cluster = 0x0; // pointer to current cluster // Reset class and local contors/variables for (Int_t iPlane = 0; iPlane < AliESDtrack::kNPlane; iPlane++) { fTimBinPlane[iPlane] = -1; maxcharge[iPlane] = 0.; for (Int_t iSlice = 0; iSlice < AliESDtrack::kNSlice; iSlice++) { fdEdxPlane[iPlane][iSlice] = 0.; nCluster[iPlane][iSlice] = 0; } } // start looping over clusters attached to this track for (Int_t iClus = 0; iClus < GetNumberOfClusters(); iClus++) { cluster = fClusters[iClus]; //(AliTRDcluster*)tracker->GetCluster(fIndex[iClus]); if(!cluster) continue; // Read info from current cluster plane = AliTRDgeometry::GetPlane(cluster->GetDetector()); if (plane < 0 || plane >= AliESDtrack::kNPlane) { AliError(Form("Wrong plane %d", plane)); continue; } tb = cluster->GetLocalTimeBin(); if(tb == 0 || tb >= ntb){ AliWarning(Form("time bin 0 or > %d in cluster %d", ntb, iClus)); AliInfo(Form("dQ/dl %f", fdQdl[iClus])); continue; } slice = tb * AliESDtrack::kNSlice / ntb; fdEdxPlane[plane][slice] += fdQdl[iClus]; if(fdQdl[iClus] > maxcharge[plane]) { maxcharge[plane] = fdQdl[iClus]; fTimBinPlane[plane] = tb; } nCluster[plane][slice]++; } // End of loop over cluster // Normalize fdEdxPlane to number of clusters and set track segments for (Int_t iPlane = 0; iPlane < AliESDtrack::kNPlane; iPlane++) { for (Int_t iSlice = 0; iSlice < AliESDtrack::kNSlice; iSlice++) { if (nCluster[iPlane][iSlice]) fdEdxPlane[iPlane][iSlice] /= nCluster[iPlane][iSlice]; } } } //_____________________________________________________________________________ void AliTRDtrack::SetTrackSegmentDirMom(const Int_t plane) { if(plane<0 || plane>= kNplane){ AliError(Form("Trying to access out of range plane (%d)", plane)); return; } fSnp[plane] = GetSnp(); fTgl[plane] = GetTgl(); Double_t p[3]; GetPxPyPz(p); fMom[plane] = TMath::Sqrt(p[0]*p[0] + p[1]*p[1] + p[2]*p[2]); } //_____________________________________________________________________________ Float_t AliTRDtrack::GetTrackLengthPlane(Int_t plane) const { if(plane < 0 || plane >= kNplane) return 0.; return (AliTRDgeometry::AmThick() + AliTRDgeometry::DrThick())/TMath::Sqrt((1. - fSnp[plane]*fSnp[plane]) / (1. + fTgl[plane]*fTgl[plane])); } //_____________________________________________________________________________ Int_t AliTRDtrack::CookPID(AliESDtrack *esd) { // // This function calculates the PID probabilities based on TRD signals // // The method produces probabilities based on the charge // and the position of the maximum time bin in each layer. // The dE/dx information can be used as global charge or 2 to 3 // slices. Check AliTRDCalPID and AliTRDCalPIDRefMaker for the actual // implementation. // // Author // Alex Bercuci (A.Bercuci@gsi.de) 2nd May 2007 AliTRDcalibDB *calibration = AliTRDcalibDB::Instance(); if (!calibration) { AliError("No access to calibration data"); return -1; } // Retrieve the CDB container class with the probability distributions const AliTRDCalPID *pd = calibration->GetPIDLQObject(); if (!pd) { AliError("No access to AliTRDCalPID"); return -1; } Double_t p0 = 1./AliPID::kSPECIES; if(AliPID::kSPECIES != 5){ AliError("Probabilities array defined only for 5 values. Please modify !!"); return -1; } Double_t p[] = {p0, p0, p0, p0, p0}; Float_t length; // track segment length in chamber Int_t nPlanePID = 0; // Skip tracks which have no TRD signal at all if (fdEdx == 0.) return -1; for (Int_t iPlane = 0; iPlane < AliTRDgeometry::kNplan; iPlane++) { length = (AliTRDgeometry::AmThick() + AliTRDgeometry::DrThick())/TMath::Sqrt((1. - fSnp[iPlane]*fSnp[iPlane]) / (1. + fTgl[iPlane]*fTgl[iPlane])); // check data if((fdEdxPlane[iPlane][0] + fdEdxPlane[iPlane][1] + fdEdxPlane[iPlane][2]) <= 0. || fTimBinPlane[iPlane] == -1.) continue; // this track segment has fulfilled all requierments nPlanePID++; // Get the probabilities for the different particle species for (Int_t iSpecies = 0; iSpecies < AliPID::kSPECIES; iSpecies++) { p[iSpecies] *= pd->GetProbability(iSpecies, fMom[iPlane], fdEdxPlane[iPlane], length); //p[iSpecies] *= pd->GetProbabilityT(iSpecies, fMom[iPlane], fTimBinPlane[iPlane]); } } if(nPlanePID == 0) return 0; // normalize probabilities Double_t probTotal = 0.; for (Int_t iSpecies = 0; iSpecies < AliPID::kSPECIES; iSpecies++) probTotal += p[iSpecies]; if(probTotal <= 0.) { AliWarning("The total probability over all species <= 0. This may be caused by some error in the reference histograms."); return -1; } for(Int_t iSpecies = 0; iSpecies < AliPID::kSPECIES; iSpecies++) p[iSpecies] /= probTotal; // book PID to the ESD track esd->SetTRDpid(p); esd->SetTRDpidQuality(nPlanePID); return 0; } //_____________________________________________________________________________ Bool_t AliTRDtrack::PropagateTo(Double_t xk, Double_t xx0, Double_t xrho) { // // Propagates this track to a reference plane defined by "xk" [cm] // correcting for the mean crossed material. // // "xx0" - thickness/rad.length [units of the radiation length] // "xrho" - thickness*density [g/cm^2] // if (xk == GetX()) { return kTRUE; } Double_t oldX = GetX(); Double_t oldY = GetY(); Double_t oldZ = GetZ(); Double_t bz = GetBz(); if (!AliExternalTrackParam::PropagateTo(xk,bz)) { return kFALSE; } Double_t x = GetX(); Double_t y = GetY(); Double_t z = GetZ(); if (oldX < xk) { xrho = -xrho; if (IsStartedTimeIntegral()) { Double_t l2 = TMath::Sqrt((x-oldX)*(x-oldX) + (y-oldY)*(y-oldY) + (z-oldZ)*(z-oldZ)); Double_t crv = GetC(); if (TMath::Abs(l2*crv) > 0.0001) { // Make correction for curvature if neccesary l2 = 0.5 * TMath::Sqrt((x-oldX)*(x-oldX) + (y-oldY)*(y-oldY)); l2 = 2.0 * TMath::ASin(l2 * crv) / crv; l2 = TMath::Sqrt(l2*l2 + (z-oldZ)*(z-oldZ)); } AddTimeStep(l2); } } if (!AliExternalTrackParam::CorrectForMeanMaterial(xx0,xrho,GetMass())) { return kFALSE; } { // Energy losses************************ Double_t p2 = (1.0 + GetTgl()*GetTgl()) / (GetSigned1Pt()*GetSigned1Pt()); Double_t beta2 = p2 / (p2 + GetMass()*GetMass()); if (beta2<1.0e-10 || (5940.0 * beta2/(1.0 - beta2 + 1.0e-10) - beta2) < 0.0) { return kFALSE; } Double_t dE = 0.153e-3 / beta2 * (log(5940.0 * beta2/(1.0 - beta2 + 1.0e-10)) - beta2) * xrho; fBudget[0] += xrho; /* // Suspicious part - think about it ? Double_t kinE = TMath::Sqrt(p2); if (dE > 0.8*kinE) dE = 0.8 * kinE; // if (dE < 0) dE = 0.0; // Not valid region for Bethe bloch */ fDE += dE; /* // Suspicious ! I.B. Double_t sigmade = 0.07 * TMath::Sqrt(TMath::Abs(dE)); // Energy loss fluctuation Double_t sigmac2 = sigmade*sigmade*fC*fC*(p2+GetMass()*GetMass())/(p2*p2); fCcc += sigmac2; fCee += fX*fX * sigmac2; */ } return kTRUE; } //_____________________________________________________________________________ Bool_t AliTRDtrack::Update(const AliTRDcluster *c, Double_t chisq, Int_t index , Double_t h01) { // // Assignes found cluster to the track and updates track information // Bool_t fNoTilt = kTRUE; if (TMath::Abs(h01) > 0.003) { fNoTilt = kFALSE; } // Add angular effect to the error contribution - MI Float_t tangent2 = GetSnp()*GetSnp(); if (tangent2 < 0.90000) { tangent2 = tangent2 / (1.0 - tangent2); } //Float_t errang = tangent2 * 0.04; Double_t p[2] = {c->GetY(), c->GetZ() }; //Double_t cov[3] = {c->GetSigmaY2()+errang, 0.0, c->GetSigmaZ2()*100.0 }; Double_t sy2 = c->GetSigmaY2() * 4.0; Double_t sz2 = c->GetSigmaZ2() * 4.0; Double_t cov[3] = {sy2 + h01*h01*sz2, h01*(sy2-sz2), sz2 + h01*h01*sy2 }; if (!AliExternalTrackParam::Update(p,cov)) { return kFALSE; } Int_t n = GetNumberOfClusters(); fIndex[n] = index; SetNumberOfClusters(n+1); SetChi2(GetChi2()+chisq); return kTRUE; } //_____________________________________________________________________________ Int_t AliTRDtrack::UpdateMI(AliTRDcluster *c, Double_t chisq, Int_t index, Double_t h01, Int_t /*plane*/) { // // Assignes found cluster to the track and updates track information // Bool_t fNoTilt = kTRUE; if (TMath::Abs(h01) > 0.003) { fNoTilt = kFALSE; } // Add angular effect to the error contribution and make correction - MI Double_t tangent2 = GetSnp()*GetSnp(); if (tangent2 < 0.90000){ tangent2 = tangent2 / (1.0-tangent2); } Double_t tangent = TMath::Sqrt(tangent2); if (GetSnp() < 0) { tangent *= -1; } // // Is the following still needed ???? // // Double_t correction = 0*plane; /* Double_t errang = tangent2*0.04; // Double_t errsys =0.025*0.025*20; //systematic error part Float_t extend =1; if (c->GetNPads()==4) extend=2; */ //if (c->GetNPads()==5) extend=3; //if (c->GetNPads()==6) extend=3; //if (c->GetQ()<15) return 1; /* if (corrector!=0){ //if (0){ correction = corrector->GetCorrection(plane,c->GetLocalTimeBin(),tangent); if (TMath::Abs(correction)>0){ //if we have info errang = corrector->GetSigma(plane,c->GetLocalTimeBin(),tangent); errang *= errang; errang += tangent2*0.04; } } */ // //Double_t padlength = TMath::Sqrt(c->GetSigmaZ2()*12.); /* { Double_t dy=c->GetY() - GetY(), dz=c->GetZ() - GetZ(); printf("%e %e %e %e\n",dy,dz,padlength/2,h01); } */ Double_t p[2] = { c->GetY(), c->GetZ() }; //Double_t cov[3]={ (c->GetSigmaY2()+errang+errsys)*extend, 0.0, c->GetSigmaZ2()*10000.0 }; Double_t sy2 = c->GetSigmaY2() * 4.0; Double_t sz2 = c->GetSigmaZ2() * 4.0; Double_t cov[3] = { sy2 + h01*h01*sz2, h01*(sy2-sz2), sz2 + h01*h01*sy2 }; if (!AliExternalTrackParam::Update(p,cov)) { return kFALSE; } // Register cluster to track Int_t n = GetNumberOfClusters(); fIndex[n] = index; fClusters[n] = c; // A.Bercuci 25.07.07 SetNumberOfClusters(n+1); SetChi2(GetChi2() + chisq); return kTRUE; } // //_____________________________________________________________________________ // Int_t AliTRDtrack::UpdateMI(const AliTRDtracklet &tracklet) // { // // // // Assignes found tracklet to the track and updates track information // // // // Can this be removed ???? // // // // Double_t r00=(tracklet.GetTrackletSigma2()), r01=0., r11= 10000.; // r00+=fCyy; r01+=fCzy; r11+=fCzz; // // // Double_t det=r00*r11 - r01*r01; // Double_t tmp=r00; r00=r11/det; r11=tmp/det; r01=-r01/det; // // // Double_t dy=tracklet.GetY() - fY, dz=tracklet.GetZ() - fZ; // Double_t s00 = tracklet.GetTrackletSigma2(); // error pad // Double_t s11 = 100000; // error pad-row // Float_t h01 = tracklet.GetTilt(); // // // // r00 = fCyy + 2*fCzy*h01 + fCzz*h01*h01+s00; // r00 = fCyy + fCzz*h01*h01+s00; // // r01 = fCzy + fCzz*h01; // r01 = fCzy ; // r11 = fCzz + s11; // det = r00*r11 - r01*r01; // // inverse matrix // tmp=r00; r00=r11/det; r11=tmp/det; r01=-r01/det; // Double_t k00=fCyy*r00+fCzy*r01, k01=fCyy*r01+fCzy*r11; // Double_t k10=fCzy*r00+fCzz*r01, k11=fCzy*r01+fCzz*r11; // Double_t k20=fCey*r00+fCez*r01, k21=fCey*r01+fCez*r11; // Double_t k30=fCty*r00+fCtz*r01, k31=fCty*r01+fCtz*r11; // Double_t k40=fCcy*r00+fCcz*r01, k41=fCcy*r01+fCcz*r11; // // K matrix // // k00=fCyy*r00+fCzy*(r01+h01*r00),k01=fCyy*r01+fCzy*(r11+h01*r01); // // k10=fCzy*r00+fCzz*(r01+h01*r00),k11=fCzy*r01+fCzz*(r11+h01*r01); // // k20=fCey*r00+fCez*(r01+h01*r00),k21=fCey*r01+fCez*(r11+h01*r01); // // k30=fCty*r00+fCtz*(r01+h01*r00),k31=fCty*r01+fCtz*(r11+h01*r01); // // k40=fCcy*r00+fCcz*(r01+h01*r00),k41=fCcy*r01+fCcz*(r11+h01*r01); // // // //Update measurement // Double_t cur=fC + k40*dy + k41*dz, eta=fE + k20*dy + k21*dz; // // cur=fC + k40*dy + k41*dz; eta=fE + k20*dy + k21*dz; // if (TMath::Abs(cur*fX-eta) >= 0.90000) { // //Int_t n=GetNumberOfClusters(); // // if (n>4) cerr<GetY() - fY, dz=c->GetZ() - fZ; Double_t tiltdz = dz; if (TMath::Abs(tiltdz)>padlength/2.) { tiltdz = TMath::Sign(padlength/2,dz); } // dy=dy+h01*dz; dy=dy+h01*tiltdz; chi2 = (dy*r00*dy + 2*r01*dy*dz + dz*r11*dz)/det; } return chi2; */ } //_____________________________________________________________________________ void AliTRDtrack::MakeBackupTrack() { // // Creates a backup track // if (fBackupTrack) { delete fBackupTrack; } fBackupTrack = new AliTRDtrack(*this); } //_____________________________________________________________________________ Int_t AliTRDtrack::GetProlongation(Double_t xk, Double_t &y, Double_t &z) { // // Find a prolongation at given x // Return 0 if it does not exist // Double_t bz = GetBz(); if (!AliExternalTrackParam::GetYAt(xk,bz,y)) { return 0; } if (!AliExternalTrackParam::GetZAt(xk,bz,z)) { return 0; } return 1; } //_____________________________________________________________________________ Int_t AliTRDtrack::PropagateToX(Double_t xr, Double_t step) { // // Propagate track to given x position // Works inside of the 20 degree segmentation (local cooordinate frame for TRD , TPC, TOF) // // Material budget from geo manager // Double_t xyz0[3]; Double_t xyz1[3]; Double_t y; Double_t z; const Double_t kAlphac = TMath::Pi()/9.0; const Double_t kTalphac = TMath::Tan(kAlphac*0.5); // Critical alpha - cross sector indication Double_t dir = (GetX()>xr) ? -1.0 : 1.0; // Direction +- for (Double_t x = GetX()+dir*step; dir*x < dir*xr; x += dir*step) { GetXYZ(xyz0); GetProlongation(x,y,z); xyz1[0] = x * TMath::Cos(GetAlpha()) + y * TMath::Sin(GetAlpha()); xyz1[1] = x * TMath::Sin(GetAlpha()) - y * TMath::Cos(GetAlpha()); xyz1[2] = z; Double_t param[7]; AliTracker::MeanMaterialBudget(xyz0,xyz1,param); if ((param[0] > 0) && (param[1] > 0)) { PropagateTo(x,param[1],param[0]*param[4]); } if (GetY() > GetX()*kTalphac) { Rotate(-kAlphac); } if (GetY() < -GetX()*kTalphac) { Rotate( kAlphac); } } PropagateTo(xr); return 0; } //_____________________________________________________________________________ Int_t AliTRDtrack::PropagateToR(Double_t r,Double_t step) { // // Propagate track to the radial position // Rotation always connected to the last track position // Double_t xyz0[3]; Double_t xyz1[3]; Double_t y; Double_t z; Double_t radius = TMath::Sqrt(GetX()*GetX() + GetY()*GetY()); // Direction +- Double_t dir = (radius>r) ? -1.0 : 1.0; for (Double_t x = radius+dir*step; dir*x < dir*r; x += dir*step) { GetXYZ(xyz0); Double_t alpha = TMath::ATan2(xyz0[1],xyz0[0]); Rotate(alpha,kTRUE); GetXYZ(xyz0); GetProlongation(x,y,z); xyz1[0] = x * TMath::Cos(alpha) + y * TMath::Sin(alpha); xyz1[1] = x * TMath::Sin(alpha) - y * TMath::Cos(alpha); xyz1[2] = z; Double_t param[7]; AliTracker::MeanMaterialBudget(xyz0,xyz1,param); if (param[1] <= 0) { param[1] = 100000000; } PropagateTo(x,param[1],param[0]*param[4]); } GetXYZ(xyz0); Double_t alpha = TMath::ATan2(xyz0[1],xyz0[0]); Rotate(alpha,kTRUE); GetXYZ(xyz0); GetProlongation(r,y,z); xyz1[0] = r * TMath::Cos(alpha) + y * TMath::Sin(alpha); xyz1[1] = r * TMath::Sin(alpha) - y * TMath::Cos(alpha); xyz1[2] = z; Double_t param[7]; AliTracker::MeanMaterialBudget(xyz0,xyz1,param); if (param[1] <= 0) { param[1] = 100000000; } PropagateTo(r,param[1],param[0]*param[4]); return 0; } //_____________________________________________________________________________ Int_t AliTRDtrack::GetSector() const { // // Return the current sector // return Int_t(TVector2::Phi_0_2pi(GetAlpha()) / AliTRDgeometry::GetAlpha()) % AliTRDgeometry::kNsect; } //_____________________________________________________________________________ void AliTRDtrack::SetSampledEdx(Float_t q, Int_t i) { // // The sampled energy loss // Double_t s = GetSnp(); Double_t t = GetTgl(); q *= TMath::Sqrt((1.0 - s*s) / (1.0 + t*t)); fdQdl[i] = q; } //_____________________________________________________________________________ void AliTRDtrack::SetSampledEdx(Float_t q) { // // The sampled energy loss // Double_t s = GetSnp(); Double_t t = GetTgl(); q *= TMath::Sqrt((1.0 - s*s) / (1.0 + t*t)); fdQdl[fNdedx] = q; fNdedx++; } //_____________________________________________________________________________ Double_t AliTRDtrack::GetBz() const { // // Returns Bz component of the magnetic field (kG) // if (AliTracker::UniformField()) { return AliTracker::GetBz(); } Double_t r[3]; GetXYZ(r); return AliTracker::GetBz(r); }