1 #if !defined(__CINT__) || defined(__MAKECINT__)
3 #include <TClassTable.h>
4 #include <TStopwatch.h>
10 #include <AliGenEventHeader.h>
11 #include <AliITSVertexerIons.h>
12 #include <AliRunLoader.h>
13 #include <AliITSVertexerIons.h>
14 #include <AliITSLoader.h>
15 #include <AliGenHijingEventHeader.h>
20 void AliITSFindPrimaryVertex(Int_t evNumber1=0,Int_t NumbofEv=1, const char *filename="galice.root") {
22 Int_t evNumber2 = evNumber1+NumbofEv;
24 if (gClassTable->GetID("AliRun") < 0) {
25 gROOT->Macro("loadlibs.C");
28 delete gAlice->GetRunLoader();
34 AliRunLoader* rl = AliRunLoader::Open("galice.root");
36 ::Error("AliITSFindPrimaryVertex.C","Can not open session RL=NULL");
40 // Open output file for vertices (default name: ITS.Vertex.root
41 // and Create vertexer
43 AliITSVertexerIons *vertexer = new AliITSVertexerIons();
44 vertexer->Init("default");
45 //vertexer->SetDebug(1);
50 AliITSLoader* itsloader = (AliITSLoader*) rl->GetLoader("ITSLoader");
51 itsloader->LoadRecPoints("read");
53 for (int nev=evNumber1; nev< evNumber2; nev++) {
54 cout<<"=============================================================\n";
55 cout<<" Processing event "<<nev<<endl;
56 cout<<"=============================================================\n";
58 AliHeader *header = rl->GetHeader();
59 AliGenEventHeader* genEventHeader = header->GenEventHeader();
60 TArrayF primaryVertex(3);
61 genEventHeader->PrimaryVertex(primaryVertex);
63 AliGenHijingEventHeader* hijingHeader = (AliGenHijingEventHeader*) genEventHeader;
64 Float_t b = hijingHeader->ImpactParameter();
65 cout << "Impact parameter = " << b << " fm" << endl;
70 TTree* cltree = itsloader->TreeR();
71 V=vertexer->FindVertexForCurrentEvent(cltree);
73 TVector3 vtrue(primaryVertex[0],primaryVertex[1],primaryVertex[2]);
74 TVector3 vfound(V->GetXv(),V->GetYv(),V->GetZv());
75 TVector3 dif=vtrue-vfound;
76 cout << "True vertex coordinates (cm) = " << vtrue.X() << " " << vtrue.Y() << " " << vtrue.Z() << endl;
77 cout << "Found vertex coordinates (cm) = " << vfound.X() << " " << vfound.Y() << " " << vfound.Z() << endl; cout << "Difference true - found (cm) = " << dif.Mag() << " " << dif.X() << " " << dif.Y() << " " << dif.Z() << endl;
82 vertexer->WriteCurrentVertex();