//-------------------------------------------------------------------------
// Implementation of the V0 vertexer class
-//
+// reads tracks writes out V0 vertices
+// fills the ESD with the V0s
// Origin: Iouri Belikov, IReS, Strasbourg, Jouri.Belikov@cern.ch
//-------------------------------------------------------------------------
-#include <Riostream.h>
-#include <TFile.h>
-#include <TPDGCode.h>
#include <TObjArray.h>
#include <TTree.h>
+#include "AliESD.h"
+#include "AliESDtrack.h"
#include "AliITStrackV2.h"
#include "AliV0vertex.h"
#include "AliV0vertexer.h"
ClassImp(AliV0vertexer)
-Int_t AliV0vertexer::Tracks2V0vertices(const TFile *inp, TFile *out) {
+Int_t AliV0vertexer::Tracks2V0vertices(AliESD *event) {
//--------------------------------------------------------------------
//This function reconstructs V0 vertices
//--------------------------------------------------------------------
- TFile *in=(TFile*)inp;
- TDirectory *savedir=gDirectory;
- if (!in->IsOpen()) {
- cerr<<"AliV0vertexer::Tracks2V0vertices(): ";
- cerr<<"file with ITS tracks has not been open !\n";
- return 1;
- }
+ Int_t nentr=event->GetNumberOfTracks();
+
+ TObjArray negtrks(nentr/2);
+ TObjArray postrks(nentr/2);
+
+ Int_t nneg=0, npos=0, nvtx=0;
+
+ Int_t i;
+ for (i=0; i<nentr; i++) {
+ AliESDtrack *esd=event->GetTrack(i);
+ UInt_t status=esd->GetStatus();
+ UInt_t flags=AliESDtrack::kITSin|AliESDtrack::kTPCin|
+ AliESDtrack::kTPCpid|AliESDtrack::kESDpid;
+
+ if ((status&AliESDtrack::kITSrefit)==0)
+ if (flags!=status) continue;
+
+ AliITStrackV2 *iotrack=new AliITStrackV2(*esd);
+ iotrack->SetLabel(i); // now it is the index in array of ESD tracks
+ if ((status&AliESDtrack::kITSrefit)==0) //correction for the beam pipe
+ if (!iotrack->PropagateTo(3.,0.0023,65.19)) {
+ delete iotrack;
+ continue;
+ }
+ if (!iotrack->PropagateTo(2.5,0.,0.)) {
+ delete iotrack;
+ continue;
+ }
+
+ if (iotrack->Get1Pt() < 0.) {nneg++; negtrks.AddLast(iotrack);}
+ else {npos++; postrks.AddLast(iotrack);}
+ }
+
+
+ for (i=0; i<nneg; i++) {
+ //if (i%10==0) cerr<<nneg-i<<'\r';
+ AliITStrackV2 *ntrk=(AliITStrackV2 *)negtrks.UncheckedAt(i);
- if (!out->IsOpen()) {
- cerr<<"AliV0vertexer::Tracks2V0vertices(): ";
- cerr<<"file for V0 vertices has not been open !\n";
- return 2;
+ if (TMath::Abs(ntrk->GetD(fX,fY))<fDPmin) continue;
+ if (TMath::Abs(ntrk->GetD(fX,fY))>fRmax) continue;
+
+ for (Int_t k=0; k<npos; k++) {
+ AliITStrackV2 *ptrk=(AliITStrackV2 *)postrks.UncheckedAt(k);
+
+ if (TMath::Abs(ptrk->GetD(fX,fY))<fDPmin) continue;
+ if (TMath::Abs(ptrk->GetD(fX,fY))>fRmax) continue;
+
+ if (TMath::Abs(ntrk->GetD(fX,fY))<fDNmin)
+ if (TMath::Abs(ptrk->GetD(fX,fY))<fDNmin) continue;
+
+
+ AliITStrackV2 nt(*ntrk), pt(*ptrk), *pnt=&nt, *ppt=&pt;
+
+ Double_t dca=PropagateToDCA(pnt,ppt);
+ if (dca > fDCAmax) continue;
+
+ AliV0vertex vertex(*pnt,*ppt);
+ if (vertex.GetChi2() > fChi2max) continue;
+
+ /* Think of something better here !
+ nt.PropagateToVertex(); if (TMath::Abs(nt.GetZ())<0.04) continue;
+ pt.PropagateToVertex(); if (TMath::Abs(pt.GetZ())<0.04) continue;
+ */
+
+ Double_t x,y,z; vertex.GetXYZ(x,y,z);
+ Double_t r2=x*x + y*y;
+ if (r2 > fRmax*fRmax) continue;
+ if (r2 < fRmin*fRmin) continue;
+
+ Double_t px,py,pz; vertex.GetPxPyPz(px,py,pz);
+ Double_t p2=px*px+py*py+pz*pz;
+ Double_t cost=((x-fX)*px + (y-fY)*py + (z-fZ)*pz)/
+ TMath::Sqrt(p2*((x-fX)*(x-fX) + (y-fY)*(y-fY) + (z-fZ)*(z-fZ)));
+
+ //if (cost < (5*fCPAmax-0.9-TMath::Sqrt(r2)*(fCPAmax-1))/4.1) continue;
+ if (cost < fCPAmax) continue;
+ vertex.SetDcaDaughters(dca);
+ //vertex.ChangeMassHypothesis(); //default is Lambda0
+
+ event->AddV0(&vertex);
+
+ nvtx++;
+ }
}
- in->cd();
+ Info("Tracks2V0vertices","Number of reconstructed V0 vertices: %d",nvtx);
- Char_t name[100];
- sprintf(name,"TreeT_ITS_%d",fEventN);
- TTree *trkTree=(TTree*)in->Get(name);
- TBranch *branch=trkTree->GetBranch("tracks");
- Int_t nentr=(Int_t)trkTree->GetEntries();
+ negtrks.Delete();
+ postrks.Delete();
+
+ return 0;
+}
+
+Int_t AliV0vertexer::Tracks2V0vertices(TTree *tTree, TTree *vTree) {
+ //--------------------------------------------------------------------
+ //This function reconstructs V0 vertices
+ //--------------------------------------------------------------------
+ Warning("Tracks2V0vertices(TTree*,TTree*)",
+ "Will be removed soon ! Use Tracks2V0vertices(AliESD*) instead");
+
+ TBranch *branch=tTree->GetBranch("tracks");
+ if (!branch) {
+ Error("Tracks2V0vertices","Can't get the branch !");
+ return 1;
+ }
+ Int_t nentr=(Int_t)tTree->GetEntries();
TObjArray negtrks(nentr/2);
TObjArray postrks(nentr/2);
for (i=0; i<nentr; i++) {
AliITStrackV2 *iotrack=new AliITStrackV2;
branch->SetAddress(&iotrack);
- trkTree->GetEvent(i);
+ tTree->GetEvent(i);
- iotrack->PropagateTo(3.,0.0023,65.19); iotrack->PropagateTo(2.5,0.,0.);
+ if (!iotrack->PropagateTo(3.,0.0023,65.19)) {
+ delete iotrack;
+ continue;
+ }
+ if (!iotrack->PropagateTo(2.5,0.,0.)) {
+ delete iotrack;
+ continue;
+ }
if (iotrack->Get1Pt() > 0.) {nneg++; negtrks.AddLast(iotrack);}
else {npos++; postrks.AddLast(iotrack);}
}
- out->cd();
- sprintf(name,"TreeV%d",fEventN);
- TTree vtxTree(name,"Tree with V0 vertices");
AliV0vertex *ioVertex=0;
- vtxTree.Branch("vertices","AliV0vertex",&ioVertex,32000,0);
+ branch=vTree->GetBranch("vertices");
+ if (!branch) vTree->Branch("vertices","AliV0vertex",&ioVertex,32000,3);
+ else branch->SetAddress(&ioVertex);
for (i=0; i<nneg; i++) {
- if (i%10==0) cerr<<nneg-i<<'\r';
+ //if (i%10==0) cerr<<nneg-i<<'\r';
AliITStrackV2 *ntrk=(AliITStrackV2 *)negtrks.UncheckedAt(i);
if (TMath::Abs(ntrk->GetD(fX,fY))<fDPmin) continue;
Double_t px,py,pz; vertex.GetPxPyPz(px,py,pz);
Double_t p2=px*px+py*py+pz*pz;
Double_t cost=((x-fX)*px + (y-fY)*py + (z-fZ)*pz)/
- TMath::Sqrt(p2*((x-fX)*(x-fX) + (y-fY)*(y-fY) + (z-fZ)*(z-fZ)));
+ TMath::Sqrt(p2*((x-fX)*(x-fX) + (y-fY)*(y-fY) + (z-fZ)*(z-fZ)));
- //if (cost < (5*fCPAmax-0.9-TMath::Sqrt(r2)*(fCPAmax-1))/4.1) continue;
+ //if (cost < (5*fCPAmax-0.9-TMath::Sqrt(r2)*(fCPAmax-1))/4.1) continue;
if (cost < fCPAmax) continue;
-
+ vertex.SetDcaDaughters(dca);
//vertex.ChangeMassHypothesis(); //default is Lambda0
- ioVertex=&vertex; vtxTree.Fill();
+ ioVertex=&vertex; vTree->Fill();
nvtx++;
}
}
- cerr<<"Number of reconstructed V0 vertices: "<<nvtx<<endl;
-
- vtxTree.Write();
+ Info("Tracks2V0vertices","Number of reconstructed V0 vertices: %d",nvtx);
negtrks.Delete();
postrks.Delete();
- savedir->cd();
-
- delete trkTree;
-
return 0;
}
-Double_t AliV0vertexer::PropagateToDCA(AliITStrackV2 *n, AliITStrackV2 *p) {
+Double_t
+AliV0vertexer::PropagateToDCA(AliITStrackV2 *n, AliITStrackV2 *p) const {
//--------------------------------------------------------------------
// This function returns the DCA between two tracks
// The tracks will be moved to the point of DCA !
git://git.uio.no / u / mrichter / AliRoot.git / blobdiff