+// ----------------------------------------------------------------
+// AliBackgroundSelection
+//
+// This class implements to cuts to reject background events from the
+// samples to be used in the physics analysis:
+// 1. A linear cut on the correlation cluster vs tracklets
+// 2. A cut on the delta phi window used by the vertexer Z
+// The parameters used in both cuts can be set
+//
+// The class also produces control histograms for all and accepted
+// events, for each trigger class present in the data independently.
+// Histograms are booked on the fly in the UserExec, whenever a new
+// trigger class is found.
+//
+// After the first implementation, it was realized that the deltaphi
+// cut is more a quality selection cut than an event selection cut, so
+// it is effectively disabled by default.
+//
+// Author: Michele Floris, CERN
+// ----------------------------------------------------------------
+
+
#include "AliBackgroundSelection.h"
#include "TH2F.h"
#include "TList.h"
-#include "AliLog.h"
#include "TString.h"
#include "AliESDInputHandlerRP.h"
#include "AliAnalysisManager.h"
#include "TTree.h"
+#include "AliMultiplicity.h"
#ifdef PASS1RECO
#include "../ITS/AliITSRecPoint.h"
#endif
-#include "AliMultiplicity.h"
+
+
ClassImp(AliBackgroundSelection)
AliBackgroundSelection::AliBackgroundSelection():
- AliAnalysisCuts(), fOutputHist(0), fACut(0), fBCut(0), fDeltaPhiCut(0)
+ AliAnalysisCuts(), fOutputHist(0), fACut(0), fBCut(0), fDeltaPhiCut(10)
{
-
+ // ctor
fOutputHist = new TList();
fOutputHist->SetOwner();
fACut = 65;
fBCut = 4;
- fDeltaPhiCut = 0.02;
+ fDeltaPhiCut = 10; // effectively disabling delta phi cut by default
}
AliBackgroundSelection::AliBackgroundSelection(const char* name, const char* title):
- AliAnalysisCuts(name,title), fOutputHist(0), fACut(0), fBCut(0), fDeltaPhiCut(0)
+ AliAnalysisCuts(name,title), fOutputHist(0), fACut(0), fBCut(0), fDeltaPhiCut(10)
{
-
+ // ctor
fOutputHist = new TList();
fOutputHist->SetOwner();
fACut = 65;
fBCut = 4;
- fDeltaPhiCut = 0.02;
+ fDeltaPhiCut = 10; // effectively disabling delta phi cut by default
}
AliBackgroundSelection::AliBackgroundSelection(const AliBackgroundSelection& obj) : AliAnalysisCuts(obj),
fOutputHist(0), fACut(0), fBCut(0), fDeltaPhiCut(0)
{
-
+ // copy ctor
fOutputHist = obj.fOutputHist;
fACut = obj.fACut;
fBCut = obj.fBCut;
}
AliBackgroundSelection::~AliBackgroundSelection() {
+ // dtor
if(fOutputHist) {
delete fOutputHist;
fOutputHist = 0;
}
-Bool_t AliBackgroundSelection::IsSelected(TObject* obj){
+Bool_t AliBackgroundSelection::IsSelected(TObject* const obj)
+{
+ // returns false if the event is identifiead as beam background,
+ // true otherwise.
// reset fSelected
SetSelected(kFALSE);
void AliBackgroundSelection::Init(){
+ // Set default cut values
fACut = 65;
fBCut = 4;
void AliBackgroundSelection::BookClusterVsTrackletsHisto(const char * trigger_name){
+ // Book control histogram for the cut on the correlation cluster vs tracklets
+
Bool_t oldStatus = TH1::AddDirectoryStatus();
TH1::AddDirectory(kFALSE);
void AliBackgroundSelection::BookDeltaPhiHisto(const char * trigger_name){
+ // Book control histogram for the cut on the DeltaPhi window used by vertexer Z
+
Bool_t oldStatus = TH1::AddDirectoryStatus();
TH1::AddDirectory(kFALSE);
}
TH2F * AliBackgroundSelection::GetClusterVsTrackletsHisto(const char * trigger_name){
+
+ // Returns the control histogram corresponding to a given trigger
+ // class. If it does not exist, it creates it and adds it to the
+ // output list
+ // All Events
+
if(!fOutputHist) {AliError("List of histos not initialized");return 0;}
TH2F * h = (TH2F*) fOutputHist->FindObject(GetClusterVsTrackletsHistoName(trigger_name));
if(!h) {
return h;
}
TH1F * AliBackgroundSelection::GetDeltaPhiHisto(const char * trigger_name){
+
+ // Returns the control histogram corresponding to a given trigger
+ // class. If it does not exist, it creates it and adds it to the
+ // output list
+ // All Events
+
if(!fOutputHist) {AliError("List of histos not initialized");return 0;}
TH1F * h = (TH1F*) fOutputHist->FindObject(GetDeltaPhiHistoName(trigger_name));
if(!h) {
TH2F * AliBackgroundSelection::GetClusterVsTrackletsHistoAccepted(const char * trigger_name){
+ // Returns the control histogram corresponding to a given trigger
+ // class. If it does not exist, it creates it and adds it to the
+ // output list
+ // Events passing the cut only
+
if(!fOutputHist) {AliError("List of histos not initialized");return 0;}
TH2F * h = (TH2F*) fOutputHist->FindObject(GetClusterVsTrackletsHistoNameAccepted(trigger_name));
if(!h) {
TH1F * AliBackgroundSelection::GetDeltaPhiHistoAccepted(const char * trigger_name){
+ // Returns the control histogram corresponding to a given trigger
+ // class. If it does not exist, it creates it and adds it to the
+ // output list
+ // Events passing the cut only
+
if(!fOutputHist) {AliError("List of histos not initialized");return 0;}
TH1F * h = (TH1F*) fOutputHist->FindObject(GetDeltaPhiHistoNameAccepted(trigger_name));
if(!h) {
}
const char * AliBackgroundSelection::GetClusterVsTrackletsHistoName(const char * trigger_name){
+
+ // build up the name of the cluster vs tracklets histo using the trigger class
+
static TString str;
str = ("hCvsT");
str = str+GetName()+"_"+trigger_name;
}
const char * AliBackgroundSelection::GetClusterVsTrackletsHistoNameAccepted(const char * trigger_name){
+
+ // build up the name of the cluster vs tracklets histo using the trigger class (accepted events)
static TString str;
str = ("hCvsT");
str = str+GetName()+"_"+trigger_name + "_accepted";
}
const char * AliBackgroundSelection::GetDeltaPhiHistoName(const char * trigger_name){
+
+ // build up the name of the delta phi histo using the trigger class
+
+
static TString str;
str = ("hDeltaPhi");
str = str+GetName()+"_"+trigger_name;
}
const char * AliBackgroundSelection::GetDeltaPhiHistoNameAccepted(const char * trigger_name){
+
+ // build up the name of the delta phi histo using the trigger class (accepted events)
+
static TString str;
str = ("hDeltaPhi");
str = str+GetName()+"_"+trigger_name + "_accepted";
return str.Data();
}
-Long64_t AliBackgroundSelection::Merge(TCollection* list)
+Long64_t AliBackgroundSelection::Merge(TCollection* const list)
{
// Merge a list of AliBackgroundSelection objects with this (needed for
// PROOF).
// the same order. We thus also have to sort the list (sorting is
// done by name in TList).
- AliInfo("Merging");
+ //AliInfo("Merging");
if (!list)
return 0;
Int_t count = 0;
// 1. Sort this list
fOutputHist->Sort();
-
+
while ((obj = iter->Next())) {
-
+ Bool_t foundDiffinThisIterStep = kFALSE;
+ // Printf("%d - %s",count, obj->GetName());
AliBackgroundSelection* entry = dynamic_cast<AliBackgroundSelection*> (obj);
if (entry == 0)
continue;
Bool_t areListsDifferent=kTRUE;
Int_t iloop = 0;
- Int_t max_loops = hlist->GetSize() + fOutputHist->GetSize(); // In the worst case all of the histos will be different...
+ Int_t maxLoops = hlist->GetSize() + fOutputHist->GetSize(); // In the worst case all of the histos will be different...
while(areListsDifferent) {
- if(iloop>max_loops) AliFatal("Infinite Loop?");
+ if(iloop>maxLoops) AliFatal("Infinite Loop?");
iloop++;
// sort
hlist->Sort();
fOutputHist->Sort();
+ // loop over the largest
+
// loop over the largest
TObject * hist =0;
TIterator * iterlist = 0;
- if (hlist->GetSize() >= fOutputHist->GetSize()) iterlist = hlist->MakeIterator();
- else iterlist = fOutputHist->MakeIterator();
-
+ TList * thislist = 0; // the list over which I'm iterating (i.e. the largest)
+ TList * otherlist = 0; // the other list
+
+ if (hlist->GetSize() >= fOutputHist->GetSize()) {
+ thislist = hlist;
+ otherlist = fOutputHist;
+ }
+ else{
+ thislist = fOutputHist;
+ otherlist = hlist;
+ }
+ iterlist = thislist->MakeIterator();
+
while ((hist= iterlist->Next())){
- // if we missed a trigger type, we missed it for both histo categories
- // getters automatically book non-existing histos
-
- // We have to work out trigger class from name:
- TString trigger_name = hist->GetName();
- trigger_name.ReplaceAll("_accepted","");
- trigger_name = trigger_name(trigger_name.Last('_')+1,trigger_name.Length());
-
- if (hlist->GetSize() >= fOutputHist->GetSize()) {
- GetDeltaPhiHisto(trigger_name.Data());
- GetClusterVsTrackletsHisto(trigger_name.Data());
+ if(!otherlist->FindObject(hist->GetName())){
+ //AliInfo(Form("Adding object %s",hist->GetName()));
+ foundDiffinThisIterStep = kTRUE;
+ TH1 * hclone = (TH1*) hist->Clone();
+ hclone->Reset();
+ otherlist->Add(hclone);
}
- else {
- entry->GetDeltaPhiHisto(trigger_name.Data());
- entry->GetClusterVsTrackletsHisto(trigger_name.Data());
- }
}
+ delete iterlist;
// re-sort before checking
hlist->Sort();
fOutputHist->Sort();
// check if everything is fine
+ areListsDifferent=kFALSE;
if (hlist->GetSize() == fOutputHist->GetSize()) {
Int_t nhist = fOutputHist->GetSize();
for(Int_t ihist = 0; ihist < nhist; ihist++){
- if(strcmp(fOutputHist->At(ihist)->GetName(),hlist->At(ihist)->GetName())) break;
+ if(strcmp(fOutputHist->At(ihist)->GetName(),hlist->At(ihist)->GetName())) areListsDifferent = kTRUE;
}
- areListsDifferent=kFALSE;
+ } else {
+ areListsDifferent=kTRUE;
}
}
AliFatal(Form("Mismatching histos: %s -> %s", fOutputHist->At(ihist)->GetName(),hlist->At(ihist)->GetName()));
}
}
-
- Int_t n = 0;
- collections[n++].Add(hlist);
- count++;
+ if (foundDiffinThisIterStep){
+ iter->Reset(); // We found a difference: previous lists could
+ // also be affected... We start from scratch
+ Int_t n = 0;
+ collections[n++].Clear();
+ count = 0;
+ }
+ else {
+// AliInfo("hlist");
+// hlist->Print();
+// AliInfo("fOutputHist");
+// fOutputHist->Print();
+
+ Int_t n = 0;
+ collections[n++].Add(hlist);
+
+ count++;
+ }
}
Int_t n = 0;
git://git.uio.no / u / mrichter / AliRoot.git / blobdiff