Separating well and badly reconstructed pileup vertices. Adding statistics of associa...

[u/mrichter/AliRoot.git] / ITS / AliITSdEdxAnalyzer.cxx

diff --git a/ITS/AliITSdEdxAnalyzer.cxx b/ITS/AliITSdEdxAnalyzer.cxx
index fe9b9d19cbb2b36af67283eb6079e09b49055f57..198886be60a1d0cfc49af974df167b08ae16178e 100644 (file)
--- a/ITS/AliITSdEdxAnalyzer.cxx
+++ b/ITS/AliITSdEdxAnalyzer.cxx
@@ -26,9 +26,14 @@
 #include <TFile.h>
 #include <TParticlePDG.h>
 #include <TDatabasePDG.h>
+#include "AliStack.h"
+#include "AliLog.h"
+#include "AliESDEvent.h"
+#include "AliStack.h"
 #include "AliITSdEdxAnalyzer.h"
 #include "AliExternalTrackParam.h"
-#include "AliITSpidESD.h"
+//#include "AliITSpidESD.h"
+#include "AliITSPIDResponse.h"
 #include "AliPID.h"
 
 ClassImp(AliITSdEdxAnalyzer)
@@ -88,7 +93,7 @@ void AliITSdEdxAnalyzer::SetMomentumBins(const Int_t npbins, const Float_t pmin,
 }
 //______________________________________________________________________
 void AliITSdEdxAnalyzer::DeleteHistos(){
-  //
+  // deletes the hitograms
   if(fHistodEdx){
     for(Int_t i=0; i<GetNHistos();i++) delete fHistodEdx[i];
     delete [] fHistodEdx;
@@ -107,7 +112,7 @@ void AliITSdEdxAnalyzer::DeleteHistos(){
 }
 //______________________________________________________________________
 void AliITSdEdxAnalyzer::BookHistos(){
-  //
+  // defines the output histograms 
   fHistodEdx=new TH1F*[GetNHistos()];
   fHistoDeltadEdx=new TH1F*[GetNHistos()];
   for(Int_t iSpecie=0; iSpecie<kNParticles; iSpecie++){
@@ -142,6 +147,7 @@ void AliITSdEdxAnalyzer::BookHistos(){
 }
 //______________________________________________________________________
 void AliITSdEdxAnalyzer:: WriteHistos(TString filename) const {
+  // stores output histogrma to file
   TFile *outfile=new TFile(filename.Data(),"recreate");
   outfile->cd();
   for(Int_t i=0; i<GetNHistos();i++){ 
@@ -153,7 +159,7 @@ void AliITSdEdxAnalyzer:: WriteHistos(TString filename) const {
   delete outfile;
 }
 //______________________________________________________________________
-void AliITSdEdxAnalyzer::ReadEvent(AliESDEvent* esd, AliStack* stack){
+void AliITSdEdxAnalyzer::ReadEvent(const AliESDEvent* esd, AliStack* stack){
   // Fill histos 
   // if stack is !=0 MC truth is used to define particle specie
   // else TPC pid is used to define particle specie
@@ -199,7 +205,7 @@ void AliITSdEdxAnalyzer::ReadEvent(AliESDEvent* esd, AliStack* stack){
 }
 //______________________________________________________________________
 Int_t AliITSdEdxAnalyzer::GetPaticleIdFromTPC(const AliESDtrack* track) const {
-  //
+  // Returns the particle specie as identified by TPC
   Double_t tpcpid[AliPID::kSPECIES];
   track->GetTPCpid(tpcpid);
   Int_t maxPos=-1;
@@ -220,28 +226,29 @@ Int_t AliITSdEdxAnalyzer::GetPaticleIdFromTPC(const AliESDtrack* track) const {
 }
 //______________________________________________________________________
 Double_t AliITSdEdxAnalyzer::BetheBloch(const Float_t p, const Float_t m) const {
-  //
+  // Computes expected dE/dx value for given particle specie and momentum
+  static AliITSPIDResponse pidResponse;
   Double_t dedxbb=0.;
   if(fBBmodel==0){
     Double_t betagamma=p/m;
     Double_t conv=fDensity*1E6*fThickness/116.24*fMIP;
     dedxbb=conv*AliExternalTrackParam::BetheBlochSolid(betagamma);
   }else if(fBBmodel==1){
-    dedxbb=fMIP*AliITSpidESD::Bethe(p,m);
+    dedxbb=pidResponse.Bethe(p,m);
   }
   return dedxbb;
 }
 //______________________________________________________________________
 TGraph* AliITSdEdxAnalyzer::GetBetheBlochGraph(const Int_t pdgcode) const {
-  // Fills a TGraph with Bethe-Bloch expe
-  TGraph* g=new TGraph(0);
-  TParticlePDG* p=TDatabasePDG::Instance()->GetParticle(pdgcode);
-  Float_t mass=p->Mass();
-  for(Int_t ip=0; ip<100;ip++){
-    Float_t p=fPMin+(ip+0.5)*(fPMax-fPMin)/100.;
-    g->SetPoint(ip,p,BetheBloch(p,mass));
-  }
-  g->GetXaxis()->SetTitle("Momentum (GeV/c)");
-  g->GetYaxis()->SetTitle("dE/dx (keV/300 #mum)");
-  return g;
+ // Fills a TGraph with Bethe-Bloch expe
+ TGraph* g=new TGraph(0);
+ TParticlePDG* part=TDatabasePDG::Instance()->GetParticle(pdgcode);
+ Float_t mass=part->Mass();
+ for(Int_t ip=0; ip<100;ip++){
+   Float_t p=fPMin+(ip+0.5)*(fPMax-fPMin)/100.;
+   g->SetPoint(ip,p,BetheBloch(p,mass));
+ }
+ g->GetXaxis()->SetTitle("Momentum (GeV/c)");
+ g->GetYaxis()->SetTitle("dE/dx (keV/300 #mum)");
+ return g;
 }