--- /dev/null
+/**************************************************************************
+ * 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. *
+ **************************************************************************/
+/*
+$Log$
+*/
+/*************************************************************************
+ * *
+ * This class builds AliTPCtrack objects from generated tracks to feed *
+ * ITS tracking (V2). The AliTPCtrack is built from its first hit in *
+ * the TPC. The track is assigned a Kalman-like covariance matrix *
+ * depending on its pT and pseudorapidity and track parameters are *
+ * smeared according this covariance matrix. *
+ * Output file contains sorted tracks, ready for matching with ITS *
+ * *
+ * Test macro is: AliBarrelRec_TPCparam.C *
+ * *
+ * Origin: Andrea Dainese, Padova - e-mail: andrea.dainese@pd.infn.it *
+ * *
+ **************************************************************************/
+#include "AliTPCtrackerParam.h"
+#include "alles.h"
+#include "AliMagF.h"
+#include "AliTPCtrack.h"
+#include "TMatrixD.h"
+#include "AliKalmanTrack.h"
+
+ClassImp(AliTPCtrackerParam)
+
+//-----------------------------------------------------------------
+AliTPCtrackerParam::AliTPCtrackerParam(const Int_t coll,const Double_t Bz)
+{
+ fColl = coll; // collision code (0: PbPb6000)
+ fBz = Bz; // value of the z component of L3 field (Tesla)
+
+}
+//-----------------------------------------------------------------
+AliTPCtrackerParam::~AliTPCtrackerParam()
+{}
+//-----------------------------------------------------------------
+
+Int_t AliTPCtrackerParam::BuildTPCtracks(const TFile *inp, TFile *out, Int_t n)
+{
+
+ if(fColl!=0) {
+ cerr<<"AliTPCtrackerParam::BuildTPCtracks: Invalid collision!\n
+ Available: 0 -> PbPb6000"<<endl; return 0;
+ }
+ if(fBz!=0.4) {
+ cerr<<"AliTPCtrackerParam::BuildTPCtracks: Invalid field!\n
+ Available: 0.4"<<endl; return 0;
+ }
+
+ TFile *infile=(TFile*)inp;
+
+ AliKalmanTrack::SetConvConst(100/0.299792458/fBz);
+
+ // Get gAlice object from file
+ if(!(gAlice=(AliRun*)infile->Get("gAlice"))) {
+ cerr<<"gAlice has not been found on galice.root !\n";
+ return 1;
+ }
+
+ // Set random number generator seed
+ TDatime t;
+ gRandom->SetSeed(t.Get());
+
+
+ // loop over first n events in file
+ for(Int_t evt=0; evt<n; evt++){
+ cerr<<"+++\n+++ Processing event "<<evt<<"\n+++\n";
+
+ AliTPCtrack *tpctrack=0;
+
+ // tree for TPC tracks
+ Char_t tname[100];
+ sprintf(tname,"TreeT_TPC_%d",evt);
+ TTree *tracktree = new TTree(tname,"Tree with TPC tracks");
+ tracktree->Branch("tracks","AliTPCtrack",&tpctrack,20000,0);
+
+ // array for TPC tracks
+ TObjArray tarray(20000);
+
+
+ Int_t nparticles=gAlice->GetEvent(evt);
+
+ Bool_t done[500000];
+ for(Int_t l=0; l<500000; l++) { done[l]=kFALSE; }
+
+
+ // Get TPC detector
+ AliTPC *TPC=(AliTPC*)gAlice->GetDetector("TPC");
+ Int_t ver = TPC->IsVersion();
+ cerr<<"+++ TPC version "<<ver<<" has been found !\n";
+ AliTPCParam *digp=(AliTPCParam*)infile->Get("75x40_100x60");
+ if(!digp) { cerr<<"TPC parameters have not been found !\n"; return 1; }
+ TPC->SetParam(digp);
+
+ // Get TreeH with hits
+ TTree *TH=gAlice->TreeH();
+ Int_t ntracks=(Int_t)TH->GetEntries();
+ cerr<<"+++\n+++ Number of particles in event "<<evt<<": "<<nparticles<<"\n+++\n+++ Number of \"primary tracks\" (entries in TreeH): "<<ntracks<<"\n+++\n\n";
+
+ TParticle* Part;
+ AliTPChit* tpcHit;
+ Double_t hPx,hPy,hPz,hPt,xg,yg,zg,xl,yl,zl;
+ Double_t Alpha;
+ Float_t cosAlpha,sinAlpha;
+ Int_t label,Pdg,charge,bin;
+ Int_t tracks=0;
+ //Int_t N1=0,N2=0;
+
+ // loop over entries in TreeH
+ for(Int_t i=0; i<ntracks; i++) {
+ if(i%1000==0) cerr<<" --- Processing primary track "<<i<<" of "<<ntracks<<" ---\r";
+ TPC->ResetHits();
+ TH->GetEvent(i);
+ // Get FirstHit
+ tpcHit=(AliTPChit*)TPC->FirstHit(-1);
+ for( ; tpcHit; tpcHit=(AliTPChit*)TPC->NextHit() ) {
+ if(tpcHit->fQ !=0.) continue;
+ // Get particle momentum at hit
+ hPx=tpcHit->X(); hPy=tpcHit->Y(); hPz=tpcHit->Z();
+ hPt=TMath::Sqrt(hPx*hPx+hPy*hPy);
+ // reject hits with Pt<mag*0.45 GeV/c
+ if(hPt<(fBz*0.45)) continue;
+
+ // Get track label
+ label=tpcHit->Track();
+ // check if this track has already been processed
+ if(done[label]) continue;
+ // electric charge
+ Part = gAlice->Particle(label);
+ Pdg = Part->GetPdgCode();
+ if(Pdg>200 || Pdg==-11 || Pdg==-13) { charge=1; }
+ else if(Pdg<-200 || Pdg==11 || Pdg==13) { charge=-1; }
+ else continue;
+
+
+ if((tpcHit=(AliTPChit*)TPC->NextHit())==0) break;
+ if(tpcHit->fQ != 0.) continue;
+ // Get global coordinates of hit
+ xg=tpcHit->X(); yg=tpcHit->Y(); zg=tpcHit->Z();
+ if(TMath::Sqrt(xg*xg+yg*yg)>90.) continue;
+
+ // Get TPC sector, Alpha angle and local coordinates
+ // printf("Sector %d\n",tpcHit->fSector);
+ digp->AdjustCosSin(tpcHit->fSector,cosAlpha,sinAlpha);
+ Alpha = TMath::ATan2(sinAlpha,cosAlpha);
+ xl = xg*cosAlpha + yg*sinAlpha;
+ yl =-xg*sinAlpha + yg*cosAlpha;
+ zl = zg;
+ //printf("Alpha %f xl %f yl %f zl %f\n",Alpha,xl,yl,zl);
+
+ // reject tracks which are not in the TPC acceptance
+ if(TMath::Abs(zl+(244.-xl)*hPz/hPt)>252.) continue;
+
+ // Get bin in pT,eta
+ bin = GetBin(hPt,Part->Eta());
+
+ // Apply selection according to TPC efficiency
+ //if(abs(Pdg)==211) N1++;
+ if(!SelectedTrack(Pdg,hPt,Part->Eta())) continue;
+ //if(abs(Pdg)==211) N2++;
+
+ // Mark track as "done"
+ done[label]=kTRUE; tracks++;
+
+ // create AliTPCtrack object
+ tpctrack = BuildTrack(Alpha,xl,yl,zl,hPx,hPy,hPz,hPt,charge,label);
+
+ // put track in array
+ tarray.AddLast(tpctrack);
+
+ }
+
+ } // loop over entries in TreeH
+
+ TObjArray newtarray(20000);
+
+ // assing covariance matrixes and smear track parameters
+ CookTracks(tarray,newtarray);
+
+ // sort array with TPC tracks (decreasing pT)
+ newtarray.Sort();
+
+
+ Int_t arrentr = newtarray.GetEntriesFast();
+ //printf("\n %d \n\n",arrentr);
+ for(Int_t l=0; l<arrentr; l++) {
+ tpctrack=(AliTPCtrack*)newtarray.UncheckedAt(l);
+ tracktree->Fill();
+ }
+
+ // write the tree with tracks in the output file
+ out->cd();
+ tracktree->Write();
+
+ delete tracktree;
+
+ printf("\n\n+++\n+++ Number of TPC tracks: %d\n+++\n",tracks);
+ //printf("Average Eff: %f\n",(Float_t)N2/N1);
+
+ } // loop on events
+
+ return 0;
+}
+
+//-----------------------------------------------------------------
+AliTPCtrack* AliTPCtrackerParam::BuildTrack(Double_t alpha,Double_t x,
+ Double_t y,Double_t z,Double_t Px,
+ Double_t Py,Double_t Pz,Double_t Pt,
+ Int_t ch,Int_t lab)
+{
+ Double_t xref = x;
+ Double_t xx[5],cc[15];
+ cc[0]=cc[2]=cc[5]=cc[9]=cc[14]=10.;
+ cc[1]=cc[3]=cc[4]=cc[6]=cc[7]=cc[8]=cc[10]=cc[11]=cc[12]=cc[13]=0.;
+
+ // Magnetic field
+ TVector3 Bfield(0.,0.,fBz);
+
+
+ // radius [cm] of track projection in (x,y)
+ Double_t rho = Pt*100/0.299792458/Bfield.Z();
+ // center of track projection in local reference frame
+ TVector3 MomH,PosH;
+
+
+ // position (local) and momentum (local) at the hit
+ // in the bending plane (z=0)
+ PosH.SetXYZ(x,y,0.);
+ MomH.SetXYZ(Px*TMath::Cos(alpha)+Py*TMath::Sin(alpha),-Px*TMath::Sin(alpha)+Py*TMath::Cos(alpha),0.);
+ TVector3 Vrho = MomH.Cross(Bfield);
+ Vrho *= ch;
+ Vrho.SetMag(rho);
+
+ TVector3 Vcenter = PosH+Vrho;
+
+ Double_t x0 = Vcenter.X();
+
+ // fX = xref X-coordinate of this track (reference plane)
+ // fAlpha = Alpha Rotation angle the local (TPC sector)
+ // fP0 = YL Y-coordinate of a track
+ // fP1 = ZG Z-coordinate of a track
+ // fP2 = C*x0 x0 is center x in rotated frame
+ // fP3 = Tgl tangent of the track momentum dip angle
+ // fP4 = C track curvature
+ xx[0] = y;
+ xx[1] = z;
+ xx[3] = Pz/Pt;
+ xx[4] = -ch/rho;
+ xx[2] = xx[4]*x0;
+
+ // create the object AliTPCtrack
+ AliTPCtrack* track = new AliTPCtrack(0,xx,cc,xref,alpha);
+ // set the label
+ track->SetLabel(lab);
+
+ return track;
+}
+
+//-----------------------------------------------------------------
+Bool_t AliTPCtrackerParam::SelectedTrack(Int_t pdg,Double_t pt,Double_t eta)
+{
+ Double_t eff=0.;
+
+ //eff computed with | zl+(244-xl)*pz/pt | < 252
+ Double_t effPi[27] = {0.724587,0.743389,0.619273,0.798477,0.812036,0.823195,0.771437,0.775826,0.784136,0.809071,0.762001,0.774576,0.848834,0.787201,0.792548,0.942089,0.951631,0.951085,0.960885,0.971451,0.969103,0.983245,0.978939,0.988706,0.990852,0.985679,0.993606};
+ Double_t effK[18] = {0.377934,0.363962,0.321721,0.518784,0.547459,0.517878,0.612704,0.619101,0.620894,0.733411,0.732128,0.750373,0.790630,0.806565,0.791353,0.967486,0.970483,0.974527};
+ Double_t effP[15] = {0.131173,0.165114,0.229658,0.365357,0.412989,0.483297,0.454614,0.505173,0.658615,0.694753,0.730661,0.815680,0.873461,0.887227,0.899324};
+ Double_t effEl[15] = {0.835549,0.853746,0.718207,0.835230,0.831489,0.862222,0.757783,0.747301,0.824096,0.867949,0.871891,0.808480,0.890625,0.911765,0.973684};
+ Double_t effMu[15] = {0.553486,0.641392,0.609932,0.591126,0.706729,0.750755,0.747952,0.729051,0.760849,0.898810,0.737500,0.830357,0.735294,0.800000,0.882353};
+
+
+ if(TMath::Abs(pdg)==211) eff = LinearInterpolation(9,effPi,pt,eta);
+ if(TMath::Abs(pdg)==321) eff = LinearInterpolation(6,effK,pt,eta);
+ if(TMath::Abs(pdg)==2212) eff = LinearInterpolation(5,effP,pt,eta);
+ if(TMath::Abs(pdg)==11) eff = LinearInterpolation(5,effEl,pt,eta);
+ if(TMath::Abs(pdg)==13) eff = LinearInterpolation(5,effMu,pt,eta);
+
+ if(gRandom->Rndm() < eff) return kTRUE;
+
+ return kFALSE;
+}
+
+//-----------------------------------------------------------------
+Double_t AliTPCtrackerParam::LinearInterpolation(Int_t ptBins,Double_t *value,
+ Double_t pt,Double_t eta)
+{
+ Double_t kValue=0,kValue1=0,kValue2=0;
+ Int_t kEtaSide = (TMath::Abs(eta)<.45 ? 0 : 1);
+ Double_t kEta[3]={0.15,0.45,0.75};
+ Double_t kPt[9]={0.244,0.390,0.676,1.190,2.36,4.,6.,10.,20.};
+ if(ptBins==6) kPt[5]=10.;
+
+ for(Int_t i=0; i<ptBins; i++) {
+ if(pt<kPt[i]) {
+ if(i==0) i=1;
+ kValue1 = value[3*i-3+kEtaSide]+(value[3*i-3+kEtaSide]-value[3*i+kEtaSide])/(kPt[i-1]-kPt[i])*(pt-kPt[i-1]);
+ kValue2 = value[3*i-3+kEtaSide+1]+(value[3*i-3+kEtaSide+1]-value[3*i+kEtaSide+1])/(kPt[i-1]-kPt[i])*(pt-kPt[i-1]);
+
+ kValue = kValue1+(kValue1-kValue2)/(kEta[kEtaSide]-kEta[kEtaSide+1])*(eta-kEta[kEtaSide]);
+ break;
+ }
+ if(i==ptBins-1) {
+ i=ptBins-2;
+ kValue1 = value[3*i-3+kEtaSide]+(value[3*i-3+kEtaSide]-value[3*i+kEtaSide])/(kPt[i-1]-kPt[i])*(pt-kPt[i-1]);
+ kValue2 = value[3*i-3+kEtaSide+1]+(value[3*i-3+kEtaSide+1]-value[3*i+kEtaSide+1])/(kPt[i-1]-kPt[i])*(pt-kPt[i-1]);
+
+ kValue = kValue1+(kValue1-kValue2)/(kEta[kEtaSide]-kEta[kEtaSide+1])*(eta-kEta[kEtaSide]);
+ break;
+ }
+ }
+
+ return kValue;
+}
+
+//-----------------------------------------------------------------
+Int_t AliTPCtrackerParam::GetBin(Double_t pt,Double_t eta) {
+
+ if(TMath::Abs(eta)<0.3) {
+ if(pt<0.3) return 0;
+ if(pt>=0.3 && pt<0.5) return 3;
+ if(pt>=0.5 && pt<1.) return 6;
+ if(pt>=1. && pt<1.5) return 9;
+ if(pt>=1.5 && pt<3.) return 12;
+ if(pt>=3. && pt<5.) return 15;
+ if(pt>=5. && pt<7.) return 18;
+ if(pt>=7. && pt<15.) return 21;
+ if(pt>=15.) return 24;
+ }
+ if(TMath::Abs(eta)>=0.3 && TMath::Abs(eta)<0.6) {
+ if(pt<0.3) return 1;
+ if(pt>=0.3 && pt<0.5) return 4;
+ if(pt>=0.5 && pt<1.) return 7;
+ if(pt>=1. && pt<1.5) return 10;
+ if(pt>=1.5 && pt<3.) return 13;
+ if(pt>=3. && pt<5.) return 16;
+ if(pt>=5. && pt<7.) return 19;
+ if(pt>=7. && pt<15.) return 22;
+ if(pt>=15.) return 25;
+ }
+ if(TMath::Abs(eta)>=0.6) {
+ if(pt<0.3) return 2;
+ if(pt>=0.3 && pt<0.5) return 5;
+ if(pt>=0.5 && pt<1.) return 8;
+ if(pt>=1. && pt<1.5) return 11;
+ if(pt>=1.5 && pt<3.) return 14;
+ if(pt>=3. && pt<5.) return 17;
+ if(pt>=5. && pt<7.) return 20;
+ if(pt>=7. && pt<15.) return 23;
+ if(pt>=15.) return 26;
+ }
+
+ return -1;
+
+}
+
+//-----------------------------------------------------------------
+
+TMatrixD AliTPCtrackerParam::GetSmearingMatrix(Double_t* cc,Double_t pt,Double_t eta)
+{
+ TMatrixD CovMat(5,5);
+
+ CovMat(0,0)=cc[0];
+ CovMat(1,0)=cc[1]; CovMat(0,1)=CovMat(1,0);
+ CovMat(1,1)=cc[2];
+ CovMat(2,0)=cc[3]; CovMat(0,2)=CovMat(2,0);
+ CovMat(2,1)=cc[4]; CovMat(1,2)=CovMat(2,1);
+ CovMat(2,2)=cc[5];
+ CovMat(3,0)=cc[6]; CovMat(0,3)=CovMat(3,0);
+ CovMat(3,1)=cc[7]; CovMat(1,3)=CovMat(3,1);
+ CovMat(3,2)=cc[8]; CovMat(2,3)=CovMat(3,2);
+ CovMat(3,3)=cc[9];
+ CovMat(4,0)=cc[10]; CovMat(0,4)=CovMat(4,0);
+ CovMat(4,1)=cc[11]; CovMat(1,4)=CovMat(4,1);
+ CovMat(4,2)=cc[12]; CovMat(2,4)=CovMat(4,2);
+ CovMat(4,3)=cc[13]; CovMat(3,4)=CovMat(4,3);
+ CovMat(4,4)=cc[14];
+
+ TMatrixD ScaleMat(5,5);
+ for(Int_t k=0;k<5;k++) {
+ for(Int_t l=0;l<5;l++) {
+ ScaleMat(k,l)=0.;
+ }
+ }
+
+
+ Double_t s00[27]={1.3553,1.2973,1.2446,1.3428,1.3031,1.2345,1.3244,1.2681,1.2046,1.3046,1.2430,1.1606,1.2462,1.2104,1.1082,1.2207,1.1189,1.0789,1.2079,1.1300,1.0426,1.1502,1.1122,1.0559,1.1419,1.1072,1.0208};
+ Double_t s11[27]={1.0890,1.1463,1.2313,1.1149,1.1597,1.2280,1.1225,1.1584,1.2329,1.1149,1.1550,1.2369,1.1095,1.1353,1.2050,1.0649,1.0858,1.1546,1.0663,1.0672,1.1340,1.0416,1.0738,1.0945,1.0663,1.0654,1.0909};
+ Double_t s22[27]={1.1709,1.1367,1.0932,1.2247,1.1832,1.1247,1.2470,1.2017,1.1441,1.2202,1.1653,1.1050,1.1819,1.1269,1.0583,1.1546,1.0621,0.9928,1.1305,1.0512,0.9576,1.0995,1.0445,0.9884,1.0968,1.0368,0.9574};
+ Double_t s33[27]={0.9720,0.9869,1.0271,1.0030,1.0223,1.0479,1.0164,1.0305,1.0559,1.0339,1.0450,1.0686,1.0450,1.0507,1.0784,1.0334,1.0208,1.0863,1.0252,1.0114,1.0835,0.9854,1.0144,1.0507,1.0124,1.0159,1.0464};
+ Double_t s44[27]={1.1104,1.0789,1.0479,1.1597,1.1234,1.0728,1.2087,1.1602,1.1041,1.1942,1.1428,1.0831,1.1572,1.1036,1.0431,1.1296,1.0498,0.9844,1.1145,1.0266,0.9489,1.0959,1.0450,0.9875,1.0775,1.0266,0.9406};
+
+
+ ScaleMat(0,0) = LinearInterpolation(9,s00,pt,eta);
+ ScaleMat(1,1) = LinearInterpolation(9,s11,pt,eta);
+ ScaleMat(2,2) = LinearInterpolation(9,s22,pt,eta);
+ ScaleMat(3,3) = LinearInterpolation(9,s33,pt,eta);
+ ScaleMat(4,4) = LinearInterpolation(9,s44,pt,eta);
+
+ TMatrixD Mat(ScaleMat,TMatrixD::kMult,CovMat);
+ TMatrixD CovMatSmear(Mat,TMatrixD::kMult,ScaleMat);
+
+
+ return CovMatSmear;
+}
+
+//-----------------------------------------------------------------
+void AliTPCtrackerParam::SmearTrack(Double_t* xx,Double_t* xxsm,TMatrixD cov) {
+
+ // build triangular matrix Bmat
+ TMatrixD* Bmat = new TMatrixD(5,5);
+
+ for(Int_t j=0;j<5;j++){
+ Double_t accum = 0;
+ for(Int_t k=0;k<j;k++){
+ accum += (*Bmat)(j,k)* (*Bmat)(j,k);
+ }
+ (*Bmat)(j,j)=TMath::Sqrt(TMath::Abs(cov(j,j)-accum));
+ for(Int_t i=j+1;i<5;i++){
+ accum = 0;
+ for(Int_t k=0;k<j;k++){
+ accum+=(*Bmat)(i,k)* (*Bmat)(j,k);
+ }
+ (*Bmat)(i,j) = (cov(i,j)-accum) / (*Bmat)(j,j);
+ }
+ }
+
+ // get array of numbers with normal distribution
+ TArrayD norm;
+ norm.Set(5);
+ for(Int_t l=0;l<5;l++) {
+ norm[l]=gRandom->Gaus();
+ }
+
+ // use Bmat matrix to generate correlated numbers
+ TArrayD corr;
+ corr.Set(5);
+ for(Int_t i=0;i<5;i++){
+ corr[i]=0;
+ for(Int_t j=0;j<=i;j++) corr[i] += (*Bmat)(i,j)*norm[j];
+ }
+
+ delete Bmat;
+
+ for(Int_t l=0;l<5;l++) {
+ xxsm[l] = xx[l]+corr[l];
+ }
+
+ return;
+}
+
+//-----------------------------------------------------------------
+void AliTPCtrackerParam::CookTracks(TObjArray& tarray,TObjArray& newtarray)
+{
+ TString* s = new TString("$ALICE_ROOT/TPC/CovMatrixDB_");
+ if(fColl==0) s->Append("PbPb6000");
+ if(fBz==0.4) s->Append("_B0.4T.root");
+ // open file with matrixes DB
+ TFile* DBfile = new TFile(s->Data());
+
+ AliTPCtrack* track=new AliTPCtrack;
+ Int_t entr = (Int_t)tarray.GetEntriesFast();
+
+ for(Int_t k=0; k<entr; k++) {
+ track=(AliTPCtrack*)tarray.UncheckedAt(k);
+
+ Double_t pt = 1/TMath::Abs(track->Get1Pt());
+ Double_t eta = -TMath::Log(TMath::Tan(0.25*TMath::Pi()-0.5*TMath::ATan(track->GetTgl())));
+
+ Int_t bin = GetBin(pt,eta);
+
+ // string with tree name
+ TString str("Tree_bin");
+ str+=bin;
+
+ // get the right tree
+ TTree* CovTree = (TTree*)DBfile->Get(str.Data());
+ TArrayF* matrix = new TArrayF;
+ CovTree->SetBranchAddress("matrixes",&matrix);
+
+ // get random entry from the tree
+ Int_t Entries = (Int_t)CovTree->GetEntries();
+ CovTree->GetEvent(gRandom->Integer(Entries));
+
+ Double_t xref,alpha,xx[5],xxsm[5],cc[15];
+ Int_t lab;
+ // get P and Cosl from track
+ Double_t Cosl = TMath::Cos(TMath::ATan(track->GetTgl()));
+ Double_t P = 1/TMath::Abs(track->Get1Pt())/Cosl;
+
+ // get covariance matrix from regularized matrix
+ cc[0]=matrix->At(0)*(1.588e-3+1.911e-4/TMath::Power(P,1.5));
+ cc[1]=matrix->At(1);
+ cc[2]=matrix->At(2)*(1.195e-3+0.8102e-3/P);
+ cc[3]=matrix->At(3)*(7.275e-5+1.181e-5/TMath::Power(P,1.5));
+ cc[4]=matrix->At(4);
+ cc[5]=matrix->At(5)*(5.163e-6+1.138e-6/TMath::Power(P,2.)/Cosl);
+ cc[6]=matrix->At(6);
+ cc[7]=matrix->At(7)*(1.176e-5+1.175e-5/TMath::Power(P,1.5)/Cosl/Cosl/Cosl);
+ cc[8]=matrix->At(8);
+ cc[9]=matrix->At(9)*(1.289e-7+4.636e-7/TMath::Power(P,1.7)/Cosl/Cosl/Cosl/Cosl);
+ cc[10]=matrix->At(10)*(4.056e-7+4.379e-8/TMath::Power(P,1.5));
+ cc[11]=matrix->At(11);
+ cc[12]=matrix->At(12)*(3.049e-8+8.244e-9/TMath::Power(P,2.)/Cosl);
+ cc[13]=matrix->At(13);
+ cc[14]=matrix->At(14)*(1.847e-10+5.822e-11/TMath::Power(P,2.)/Cosl/Cosl/Cosl);
+
+ TMatrixD CovMatSmear(5,5);
+
+ CovMatSmear = GetSmearingMatrix(cc,pt,eta);
+
+ // get track original parameters
+ xref=track->GetX();
+ alpha=track->GetAlpha();
+ xx[0]=track->GetY();
+ xx[1]=track->GetZ();
+ xx[2]=track->GetX()*track->GetC()-track->GetSnp();
+ xx[3]=track->GetTgl();
+ xx[4]=track->GetC();
+ lab=track->GetLabel();
+
+ // use smearing matrix to smear the original parameters
+ SmearTrack(xx,xxsm,CovMatSmear);
+
+ AliTPCtrack* tpctrack = new AliTPCtrack(0,xxsm,cc,xref,alpha);
+ tpctrack->SetLabel(lab);
+
+ // fill the array
+ newtarray.AddLast(tpctrack);
+
+ }
+
+ DBfile->Close();
+
+ return;
+}
+//-----------------------------------------------------------------
+
+
+
+
+
+
+
+
+
+
+
+
git://git.uio.no / u / mrichter / AliRoot.git / commitdiff