* about the suitability of this software for any purpose. It is *
* provided "as is" without express or implied warranty. *
**************************************************************************/
-#include <AliESDVertex.h>
-#include <AliITSVertexer3D.h>
-#include <AliStrLine.h>
-#include <AliVertexerTracks.h>
-#include <Riostream.h>
#include <TH3F.h>
#include <TTree.h>
-#include<TClonesArray.h>
+#include <TClonesArray.h>
+#include "AliESDVertex.h"
#include "AliLog.h"
+#include "AliStrLine.h"
+#include "AliTracker.h"
#include "AliRunLoader.h"
#include "AliITSLoader.h"
#include "AliITSDetTypeRec.h"
#include "AliITSRecPoint.h"
#include "AliITSgeomTGeo.h"
+#include "AliVertexerTracks.h"
+#include "AliITSVertexer3D.h"
/////////////////////////////////////////////////////////////////
// this class implements a method to determine
// the 3 coordinates of the primary vertex
ClassImp(AliITSVertexer3D)
+/* $Id$ */
+
//______________________________________________________________________
AliITSVertexer3D::AliITSVertexer3D():AliITSVertexer(),
fLines(),
fZCutDiamond(0.),
fMaxZCut(0.),
fDCAcut(0.),
-fDiffPhiMax(0.)
- {
+fDiffPhiMax(0.),
+fMeanPSelTrk(0.),
+fMeanPtSelTrk(0.)
+{
// Default constructor
SetCoarseDiffPhiCut();
SetCoarseMaxRCut();
SetMaxZCut();
SetDCAcut();
SetDiffPhiMax();
+ SetMeanPSelTracks();
+ SetMeanPtSelTracks();
}
//______________________________________________________________________
fZCutDiamond(0.),
fMaxZCut(0.),
fDCAcut(0.),
-fDiffPhiMax(0.)
+fDiffPhiMax(0.),
+fMeanPSelTrk(0.),
+fMeanPtSelTrk(0.)
{
// Standard constructor
fLines = new TClonesArray("AliStrLine",1000);
SetMaxZCut();
SetDCAcut();
SetDiffPhiMax();
+ SetMeanPSelTracks();
+ SetMeanPtSelTracks();
}
//______________________________________________________________________
Float_t vRadius=TMath::Sqrt(fVert3D.GetXv()*fVert3D.GetXv()+fVert3D.GetYv()*fVert3D.GetYv());
if(vRadius<GetPipeRadius() && fVert3D.GetNContributors()>0){
- fCurrentVertex = new AliESDVertex();
+ Double_t position[3]={fVert3D.GetXv(),fVert3D.GetYv(),fVert3D.GetZv()};
+ Double_t covmatrix[6];
+ fVert3D.GetCovMatrix(covmatrix);
+ Double_t chi2=99999.;
+ Int_t nContr=fVert3D.GetNContributors();
+ fCurrentVertex = new AliESDVertex(position,covmatrix,chi2,nContr);
fCurrentVertex->SetTitle("vertexer: 3D");
fCurrentVertex->SetName("Vertex");
- fCurrentVertex->SetXv(fVert3D.GetXv());
- fCurrentVertex->SetYv(fVert3D.GetYv());
- fCurrentVertex->SetZv(fVert3D.GetZv());
fCurrentVertex->SetDispersion(fVert3D.GetDispersion());
- fCurrentVertex->SetNContributors(fVert3D.GetNContributors());
}
FindMultiplicity(evnumber);
return fCurrentVertex;
TTree *tR = itsLoader->TreeR();
detTypeRec.SetTreeAddressR(tR);
TClonesArray *itsRec = 0;
- // lc and gc are local and global coordinates for layer 1
- Float_t lc[3]; for(Int_t ii=0; ii<3; ii++) lc[ii]=0.;
- Float_t gc[3]; for(Int_t ii=0; ii<3; ii++) gc[ii]=0.;
+ // lc1 and gc1 are local and global coordinates for layer 1
+ // Float_t lc1[3]={0.,0.,0.};
+ Float_t gc1[3]={0.,0.,0.};
// lc2 and gc2 are local and global coordinates for layer 2
- Float_t lc2[3]; for(Int_t ii=0; ii<3; ii++) lc2[ii]=0.;
- Float_t gc2[3]; for(Int_t ii=0; ii<3; ii++) gc2[ii]=0.;
+ // Float_t lc2[3]={0.,0.,0.};
+ Float_t gc2[3]={0.,0.,0.};
itsRec = detTypeRec.RecPoints();
TBranch *branch;
Int_t nrpL2 = 0; // number of rec points on layer 2
// By default irstL1=0 and lastL1=79
- Int_t irstL1 = AliITSgeomTGeo::GetModuleIndex(1,1,1);
+ Int_t firstL1 = AliITSgeomTGeo::GetModuleIndex(1,1,1);
Int_t lastL1 = AliITSgeomTGeo::GetModuleIndex(2,1,1)-1;
- for(Int_t module= irstL1; module<=lastL1;module++){ // count number of recopints on layer 1
+ for(Int_t module= firstL1; module<=lastL1;module++){ // count number of recopints on layer 1
branch->GetEvent(module);
nrpL1+= itsRec->GetEntries();
detTypeRec.ResetRecPoints();
}
- //By default irstL2=80 and lastL2=239
- Int_t irstL2 = AliITSgeomTGeo::GetModuleIndex(2,1,1);
+ //By default firstL2=80 and lastL2=239
+ Int_t firstL2 = AliITSgeomTGeo::GetModuleIndex(2,1,1);
Int_t lastL2 = AliITSgeomTGeo::GetModuleIndex(3,1,1)-1;
- for(Int_t module= irstL2; module<=lastL2;module++){ // count number of recopints on layer 2
+ for(Int_t module= firstL2; module<=lastL2;module++){ // count number of recopints on layer 2
branch->GetEvent(module);
nrpL2+= itsRec->GetEntries();
detTypeRec.ResetRecPoints();
Double_t a[3]={xbeam,ybeam,0.};
Double_t b[3]={xbeam,ybeam,10.};
AliStrLine zeta(a,b,kTRUE);
+ Float_t bField=AliTracker::GetBz()/10.; //T
+ SetMeanPPtSelTracks(bField);
Int_t nolines = 0;
// Loop on modules of layer 1
- for(Int_t modul1= irstL1; modul1<=lastL1;modul1++){ // Loop on modules of layer 1
+ for(Int_t modul1= firstL1; modul1<=lastL1;modul1++){ // Loop on modules of layer 1
UShort_t ladder=int(modul1/4)+1; // ladders are numbered starting from 1
branch->GetEvent(modul1);
Int_t nrecp1 = itsRec->GetEntries();
}
detTypeRec.ResetRecPoints();
for(Int_t j=0;j<nrecp1;j++){
- AliITSRecPoint *recp = (AliITSRecPoint*)prpl1->At(j);
+ AliITSRecPoint *recp1 = (AliITSRecPoint*)prpl1->At(j);
// Local coordinates of this recpoint
/*
- lc[0]=recp->GetDetLocalX();
- lc[2]=recp->GetDetLocalZ();
- geom->LtoG(modul1,lc,gc); // global coordinates
+ lc[0]=recp1->GetDetLocalX();
+ lc[2]=recp1->GetDetLocalZ();
*/
- recp->GetGlobalXYZ(gc);
- Double_t phi1 = TMath::ATan2(gc[1]-ybeam,gc[0]-xbeam);
+ recp1->GetGlobalXYZ(gc1);
+ Double_t phi1 = TMath::ATan2(gc1[1]-ybeam,gc1[0]-xbeam);
if(phi1<0)phi1=2*TMath::Pi()+phi1;
for(Int_t ladl2=0 ; ladl2<fLadOnLay2*2+1;ladl2++){
for(Int_t k=0;k<4;k++){
branch->GetEvent(modul2);
Int_t nrecp2 = itsRec->GetEntries();
for(Int_t j2=0;j2<nrecp2;j2++){
- recp = (AliITSRecPoint*)itsRec->At(j2);
+ AliITSRecPoint *recp2 = (AliITSRecPoint*)itsRec->At(j2);
/*
- lc2[0]=recp->GetDetLocalX();
- lc2[2]=recp->GetDetLocalZ();
- geom->LtoG(modul2,lc2,gc2);
+ lc2[0]=recp2->GetDetLocalX();
+ lc2[2]=recp2->GetDetLocalZ();
*/
- recp->GetGlobalXYZ(gc2);
+ recp2->GetGlobalXYZ(gc2);
Double_t phi2 = TMath::ATan2(gc2[1]-ybeam,gc2[0]-xbeam);
if(phi2<0)phi2=2*TMath::Pi()+phi2;
Double_t diff = TMath::Abs(phi2-phi1);
if(diff>TMath::Pi())diff=2.*TMath::Pi()-diff;
if(diff>deltaPhi)continue;
- AliStrLine line(gc,gc2,kTRUE);
+ AliStrLine line(gc1,gc2,kTRUE);
Double_t cp[3];
Int_t retcode = line.Cross(&zeta,cp);
if(retcode<0)continue;
if(dca>deltaR)continue;
Double_t deltaZ=cp[2]-zvert;
if(TMath::Abs(deltaZ)>dZmax)continue;
- MakeTracklet(gc,gc2,nolines);
+
+ TClonesArray &lines = *fLines;
+ if(nolines == 0){
+ if(fLines->GetEntriesFast()>0)fLines->Clear();
+ }
+ if(fLines->GetEntriesFast()==fLines->GetSize()){
+ Int_t newsize=(Int_t) 1.5*fLines->GetEntriesFast();
+ fLines->Expand(newsize);
+ }
+ Float_t cov[6];
+ recp2->GetGlobalCov(cov);
+
+
+ Float_t rad1=TMath::Sqrt(gc1[0]*gc1[0]+gc1[1]*gc1[1]);
+ Float_t rad2=TMath::Sqrt(gc2[0]*gc2[0]+gc2[1]*gc2[1]);
+ Float_t factor=(rad1+rad2)/(rad2-rad1); //factor to account for error on tracklet direction
+
+ Float_t curvErr=0;
+ if(bField>0.00001){
+ Float_t curvRadius=fMeanPtSelTrk/(0.3*bField)*100; //cm
+ Float_t dRad=TMath::Sqrt(TMath::Power((gc1[0]-gc2[0]),2)+TMath::Power((gc1[1]-gc2[1]),2));
+ Float_t aux=dRad/2.+rad1;
+ curvErr=TMath::Sqrt(curvRadius*curvRadius-dRad*dRad/4.)-TMath::Sqrt(curvRadius*curvRadius-aux*aux); //cm
+ }
+
+ Float_t sigmasq[3];
+ sigmasq[0]=(cov[0]+curvErr*curvErr/2.)*factor*factor;
+ sigmasq[1]=(cov[3]+curvErr*curvErr/2.)*factor*factor;
+ sigmasq[2]=cov[5]*factor*factor;
+
+ // Multiple scattering
+ Float_t beta=1.;
+ Float_t beta2=beta*beta;
+ Float_t p2=fMeanPSelTrk*fMeanPSelTrk;
+ Float_t rBP=GetPipeRadius();
+ Float_t dBP=0.08/35.3; // 800 um of Be
+ Float_t dL1=0.01; //approx. 1% of radiation length
+ Float_t theta2BP=14.1*14.1/(beta2*p2*1e6)*TMath::Abs(dBP);
+ Float_t theta2L1=14.1*14.1/(beta2*p2*1e6)*TMath::Abs(dL1);
+ Float_t thetaBP=TMath::Sqrt(theta2BP);
+ Float_t thetaL1=TMath::Sqrt(theta2L1);
+// Float_t geomfac[3];
+// geomfac[0]=sin(phi1)*sin(phi1);
+// geomfac[1]=cos(phi1)*cos(phi1);
+// Float_t tgth=(gc2[2]-gc1[2])/(rad2-rad1);
+// geomfac[2]=1+tgth*tgth;
+ for(Int_t ico=0; ico<3;ico++){
+// printf("Error on coord. %d due to cov matrix+curvErr=%f\n",ico,sigmasq[ico]);
+// // sigmasq[ico]+=rad1*rad1*geomfac[ico]*theta2L1/2; // multiple scattering in layer 1
+// // sigmasq[ico]+=rBP*rBP*geomfac[ico]*theta2BP/2; // multiple scattering in beam pipe
+ sigmasq[ico]+=TMath::Power(rad1*TMath::Tan(thetaL1),2)/3.;
+ sigmasq[ico]+=TMath::Power(rBP*TMath::Tan(thetaBP),2)/3.;
+
+// printf("Multipl. scatt. contr %d = %f (LAY1), %f (BP)\n",ico,rad1*rad1*geomfac[ico]*theta2L1/2,rBP*rBP*geomfac[ico]*theta2BP/2);
+// printf("Total error on coord %d = %f\n",ico,sigmasq[ico]);
+ }
+ Float_t wmat[9]={1.,0.,0.,0.,1.,0.,0.,0.,1.};
+ if(sigmasq[0]!=0.) wmat[0]=1./sigmasq[0];
+ if(sigmasq[1]!=0.) wmat[4]=1./sigmasq[1];
+ if(sigmasq[2]!=0.) wmat[8]=1./sigmasq[2];
+ new(lines[nolines++])AliStrLine(gc1,sigmasq,wmat,gc2,kTRUE);
+
}
detTypeRec.ResetRecPoints();
}
Double_t point[3];
Int_t retc = l1->Cross(l2,point);
if(retc<0)continue;
+ Double_t deltaZ=point[2]-zvert;
+ if(TMath::Abs(deltaZ)>dZmax)continue;
Double_t rad=TMath::Sqrt(point[0]*point[0]+point[1]*point[1]);
if(rad>fCoarseMaxRCut)continue;
Double_t deltaX=point[0]-xbeam;
Double_t deltaY=point[1]-ybeam;
- Double_t deltaZ=point[2]-zvert;
Double_t raddist=TMath::Sqrt(deltaX*deltaX+deltaY*deltaY);
- if(TMath::Abs(deltaZ)>dZmax)continue;
if(raddist>deltaR)continue;
validate[i]=1;
validate[j]=1;
return retcode;
}
- //______________________________________________________________________
-void AliITSVertexer3D::MakeTracklet(Double_t *pA, Double_t *pB, Int_t &nolines) {
- // makes a tracklet
- TClonesArray &lines = *fLines;
- if(nolines == 0){
- if(fLines->GetEntriesFast()>0)fLines->Clear();
- }
- if(fLines->GetEntriesFast()==fLines->GetSize()){
- Int_t newsize=(Int_t) 1.5*fLines->GetEntriesFast();
- fLines->Expand(newsize);
+//________________________________________________________
+void AliITSVertexer3D::SetMeanPPtSelTracks(Float_t fieldTesla){
+ // Sets mean values of P and Pt based on the field
+ if(TMath::Abs(fieldTesla-0.5)<0.01){
+ SetMeanPSelTracks(0.885);
+ SetMeanPtSelTracks(0.630);
+ }else if(TMath::Abs(fieldTesla-0.4)<0.01){
+ SetMeanPSelTracks(0.805);
+ SetMeanPtSelTracks(0.580);
+ }else if(TMath::Abs(fieldTesla-0.2)<0.01){
+ SetMeanPSelTracks(0.740);
+ SetMeanPtSelTracks(0.530);
+ }else if(fieldTesla<0.00001){
+ SetMeanPSelTracks(0.730);
+ SetMeanPtSelTracks(0.510);
+ }else{
+ SetMeanPSelTracks();
+ SetMeanPtSelTracks();
}
-
- new(lines[nolines++])AliStrLine(pA,pB,kTRUE);
}
- //______________________________________________________________________
-void AliITSVertexer3D::MakeTracklet(Float_t *pA, Float_t *pB, Int_t &nolines) {// Makes a tracklet
- //
- Double_t a[3],b[3];
- for(Int_t i=0;i<3;i++){
- a[i] = pA[i];
- b[i] = pB[i];
- }
- MakeTracklet(a,b,nolines);
-}
//________________________________________________________
void AliITSVertexer3D::PrintStatus() const {
// Print current status
- cout <<"=======================================================\n";
- cout << "Loose cut on Delta Phi "<<fCoarseDiffPhiCut<<endl;
- cout << "Cut on tracklet DCA to Z axis "<<fCoarseMaxRCut<<endl;
- cout << "Cut on tracklet DCA to beam axis "<<fMaxRCut<<endl;
- cout << "Cut on diamond (Z) "<<fZCutDiamond<<endl;
- cout << "Cut on DCA - tracklet to tracklet and to vertex "<<fDCAcut<<endl;
- cout <<" Max Phi difference: "<<fDiffPhiMax<<endl;
+ printf("=======================================================\n");
+ printf("Loose cut on Delta Phi %f\n",fCoarseDiffPhiCut);
+ printf("Cut on tracklet DCA to Z axis %f\n",fCoarseMaxRCut);
+ printf("Cut on tracklet DCA to beam axis %f\n",fMaxRCut);
+ printf("Cut on diamond (Z) %f\n",fZCutDiamond);
+ printf("Cut on DCA - tracklet to tracklet and to vertex %f\n",fDCAcut);
+ printf(" Max Phi difference: %f\n",fDiffPhiMax);
+ printf("=======================================================\n");
-
- cout <<"=======================================================\n";
}
git://git.uio.no / u / mrichter / AliRoot.git / blobdiff