--- /dev/null
+// ##### TO RUN THIS MACRO:
+// bash$ aliroot (due to AliInfo, AliError, ...)
+// root[0] gSystem->Load("libANALYSIS_NEW");
+// IN case you do not have the include path set to AliRoot includes:
+// root[1] gSystem->AddIncludePath("-I\"$ALICE_ROOT/include\"");
+// root[2] .L testEvent.C+;
+// root[3] generate();
+// root[4] filter_reco();
+
+#include "TClonesArray.h"
+#include "TChain.h"
+#include "TH1.h"
+#include "TCanvas.h"
+#include "testEvent.h"
+
+//============= First step: generate events
+void generate()
+{
+// Simple event generation
+ AliAnalysisManager *mgr = new AliAnalysisManager();
+ TaskGenerate *task = new TaskGenerate("gener");
+ mgr->AddTask(task);
+
+ if (mgr->InitAnalysis()) {
+ mgr->PrintStatus();
+ mgr->ExecAnalysis();
+ }
+ delete mgr;
+}
+
+//============= Second step: filter gammas; use TSelector functionality
+void filter_reco()
+{
+// Filter the input events having more than 100 gammas. Reconstruct pi0's
+// From gammas coming from the same vertex.
+ // Get the input data as a chain
+ TChain *chain = new TChain("T");
+ chain->Add("event02000.root");
+ chain->Add("event04000.root");
+ chain->Add("event06000.root");
+ chain->Add("event08000.root");
+ chain->Add("event10000.root");
+ // Create an analysis manager
+ AliAnalysisManager *mgr = new AliAnalysisManager();
+ // Create a filter task and register it
+ TaskFilter *task1 = new TaskFilter("TaskFilter");
+ mgr->AddTask(task1);
+ // Create a reco task and register it
+ TaskRecoPi0 *task2 = new TaskRecoPi0("TaskRecoPi0");
+ mgr->AddTask(task2);
+ // Create containers for input/output
+ AliAnalysisDataContainer *cinput = mgr->CreateContainer("input0",
+ TTree::Class(), AliAnalysisManager::kInputContainer);
+ AliAnalysisDataContainer *coutput1 = mgr->CreateContainer("output0",
+ TTree::Class(), AliAnalysisManager::kOutputContainer);
+ AliAnalysisDataContainer *coutput2 = mgr->CreateContainer("output1",
+ TList::Class(), AliAnalysisManager::kOutputContainer);
+ AliAnalysisDataContainer *coutput = mgr->CreateContainer("output",
+ TH1::Class(), AliAnalysisManager::kOutputContainer);
+ // Connect containers to the task input/outputs
+ mgr->ConnectInput(task1,0,cinput);
+ mgr->ConnectOutput(task1,0,coutput1);
+ mgr->ConnectOutput(task1,1,coutput2);
+ mgr->ConnectInput(task2,0,coutput1);
+ mgr->ConnectOutput(task2,0,coutput);
+ // Connect input data
+ cinput->SetData(chain);
+ // Init analysis and start event loop
+ if (mgr->InitAnalysis()) {
+ mgr->PrintStatus();
+ chain->Process(mgr);
+ }
+// delete mgr;
+}
+
+ClassImp(TaskGenerate)
+
+//______________________________________________________________________________
+void TaskGenerate::Exec(Option_t *)
+{
+// Generate 10k events in 5 files
+ AnaEvent::CreateEvents(2000, "event02000.root");
+ AnaEvent::CreateEvents(2000, "event04000.root");
+ AnaEvent::CreateEvents(2000, "event06000.root");
+ AnaEvent::CreateEvents(2000, "event08000.root");
+ AnaEvent::CreateEvents(2000, "event10000.root");
+}
+
+ClassImp(TaskFilter)
+
+//______________________________________________________________________________
+TaskFilter::TaskFilter(const char *name)
+ :AliAnalysisTask(name,""), fEvent(0), fOutput(0), fList(0), fHist1(0), fHist2(0)
+{
+// Constructor
+ // Input slot #0 works with a tree of events
+ DefineInput(0, TTree::Class());
+
+ // Output slot #0 writes into a tree, #1 produces a hisogram
+ DefineOutput(0, TTree::Class());
+ DefineOutput(1, TList::Class());
+}
+
+//______________________________________________________________________________
+void TaskFilter::Init(Option_t *)
+{
+// Initialize branches.
+ printf(" Init %s\n", GetName());
+ if (!fEvent) {
+ // One should first check if the branch address was taken by some other task
+ char ** address = (char **)GetBranchAddress(0, "event");
+ if (address) fEvent = (AnaEvent*)(*address);
+ if (!fEvent) {
+ fEvent = new AnaEvent();
+ SetBranchAddress(0, "event", &fEvent);
+ }
+ // The output tree will be written to gammas.root
+ TDirectory *dirsav = gDirectory;
+ // Open a file for output #0
+ OpenFile(0, "gammas.root", "RECREATE");
+ fOutput = new TTree("TGAM", "gammas");
+ TBranch *branch = fOutput->Branch("event", &fEvent, 18000,1);
+ branch->SetAutoDelete(kFALSE);
+ if (dirsav) dirsav->cd();
+ }
+ if (!fList) {
+ fList = new TList();
+ fHist1 = new TH1I("ntracks", "Number of tracks per event", 100, 0, 1000);
+ fHist1->SetLineColor(kRed);
+ fHist2 = new TH1I("ngammas", "Number of gammas per event", 100, 0, 1000);
+ fHist2->SetLineColor(kBlue);
+ fList->Add(fHist1);
+ fList->Add(fHist2);
+ }
+}
+
+//______________________________________________________________________________
+void TaskFilter::Exec(Option_t *)
+{
+// Filtering.
+ TTree *tinput = (TTree*)GetInputData(0);
+ Long64_t ientry = tinput->GetReadEntry();
+ // In this case fEvent address is already connected to the input
+ if (!fEvent) return;
+ // First check multiplicity
+ Int_t ntracks = fEvent->GetNtracks();
+ // Loop tracks and get rid of non-gammas
+ AnaTrack *track;
+ Int_t igamma = 0;
+ for (Int_t i=0; i<ntracks; i++) {
+ track = fEvent->GetTrack(i);
+ if (track->GetMass() < 1.e-3) igamma++;
+ }
+ if (ientry%100 == 0) printf("TaskFilter -> Event %lld: %i tracks filtered %i gammas\n", ientry, ntracks, igamma);
+ fHist1->Fill(ntracks);
+ fHist2->Fill(igamma);
+ if (igamma > 100) {
+ fOutput->Fill();
+ PostData(0, fOutput);
+ }
+ PostData(1, fList);
+}
+
+//______________________________________________________________________________
+void TaskFilter::Terminate(Option_t *)
+{
+// Draw some histogram at the end.
+ if (!gROOT->IsBatch()) {
+ fHist1->SetMaximum(2500);
+ fHist1->Draw();
+ fHist2->Draw("SAME");
+ }
+}
+
+ClassImp(TaskRecoPi0)
+
+//______________________________________________________________________________
+TaskRecoPi0::TaskRecoPi0(const char *name)
+ :AliAnalysisTask(name,""), fEvent(0), fGammas(0), fPions(0), fHist(0)
+{
+// Constructor
+ // Input slot #0 works with a tree of events
+ DefineInput(0, TTree::Class());
+
+ // Output slot #1 produces a hisogram
+ DefineOutput(0, TH1::Class());
+}
+
+//______________________________________________________________________________
+TaskRecoPi0::~TaskRecoPi0()
+{
+// Dtor.
+ if (fEvent) delete fEvent;
+ if (fGammas) delete fGammas;
+ if (fPions) delete fPions;
+}
+
+//______________________________________________________________________________
+void TaskRecoPi0::Init(Option_t *)
+{
+// Initialize branches.
+ printf(" Init %s\n", GetName());
+ if (!fEvent) {
+ // One should first check if the branch address was taken by some other task
+ char ** address = (char **)GetBranchAddress(0, "event");
+ if (address) fEvent = (AnaEvent*)(*address);
+ if (!fEvent) {
+ fEvent = new AnaEvent();
+ SetBranchAddress(0, "event", &fEvent);
+ }
+ fGammas = new TObjArray();
+ fPions = new TObjArray();
+ }
+ if (!fHist) {
+ fHist = new TH1F("Pt_pi0", "Pt distribution for pi0's", 100, 0., 10.);
+ fHist->SetLineColor(kRed);
+ }
+}
+
+//______________________________________________________________________________
+void TaskRecoPi0::Exec(Option_t *)
+{
+// Reconstruct Pi0's for one event
+ AnaTrack *track = 0;
+ Int_t ntracks = fEvent->GetNtracks();
+ Int_t ngamma = 0;
+ Int_t i,j;
+ // Clear containers
+ fGammas->Clear();
+ fPions->Delete();
+ fPions->Clear();
+ // Loop tracks and move gammas to gamma container
+ for (i=0; i<ntracks; i++) {
+ track = fEvent->GetTrack(i);
+ if (track->GetMass() < 1.e-3) {
+ fGammas->Add(track);
+ ngamma++;
+ }
+ }
+ printf("TaskRecoPi0 -> Tracks %i \n", ntracks);
+
+ // Loop gammas and check vertex position
+ Double_t v1[3], v2[3];
+ AnaTrack *tracko = 0;
+ Double_t cutoff = 0.001;
+ for (i=0; i<ngamma-1; i++) {
+ track = (AnaTrack*)fGammas->At(i);
+ v1[0] = track->GetVertex(0);
+ v1[1] = track->GetVertex(1);
+ v1[2] = track->GetVertex(2);
+ for (j=i+1; j<ngamma; j++) {
+ tracko = (AnaTrack*)fGammas->At(j);
+ v2[0] = tracko->GetVertex(0);
+ v2[1] = tracko->GetVertex(1);
+ v2[2] = tracko->GetVertex(2);
+ Double_t dist2 = (v2[0]-v1[0])*(v2[0]-v1[0])+
+ (v2[1]-v1[1])*(v2[1]-v1[1])+
+ (v2[2]-v1[2])*(v2[2]-v1[2]);
+ if (dist2>cutoff*cutoff) continue;
+ // We have found a pair candidate
+ Double_t px = track->GetPx()+tracko->GetPx();
+ Double_t py = track->GetPy()+tracko->GetPy();
+ Double_t pz = track->GetPz()+tracko->GetPz();
+ track = new AnaTrack(px,py,pz,0.135,0,v1[0],v1[1],v1[2]);
+ fPions->Add(track);
+ fHist->Fill(track->GetPt());
+ break;
+ }
+ }
+ PostData(0,fHist);
+}
+
+//______________________________________________________________________________
+void TaskRecoPi0::Terminate(Option_t *)
+{
+// Draw some histogram at the end.
+ if (!gROOT->IsBatch()) {
+ new TCanvas("pi0", "Pt for pi0's", 800,600);
+ fHist->Draw();
+ }
+}
+
+
+ClassImp(AnaTrack)
+
+//______________________________________________________________________________
+AnaTrack::AnaTrack(Double_t random, Double_t *vertex)
+{
+// Constructor
+ Int_t itype;
+ if (random<0.3) itype = 1; // pi+
+ else if (random<0.6) itype = 2; // pi-
+ else if (random<0.9) itype = 3; // p
+ else if (random<0.95) itype = 4; // pi0
+ else itype = 5; // gamma
+ gRandom->Rannor(fPx, fPy);
+ Double_t vert_width = 0.1;
+
+ switch (itype) {
+ case 1:
+ fMass = 0.13957 + gRandom->Gaus(0.,0.001);
+ fCharge = 1;
+ break;
+ case 2:
+ fMass = 0.13957 + gRandom->Gaus(0.,0.001);
+ fCharge = -1;
+ break;
+ case 3:
+ fMass = 0.938 + gRandom->Gaus(0.,0.002);
+ fCharge = 1;
+ fPx *= 0.15;
+ fPy *= 0.15;
+ break;
+ case 4:
+ fMass = 0.135 + gRandom->Gaus(0.,0.001);
+ fCharge = 0;
+ fPx *= 0.8;
+ fPy *= 0.8;
+ vert_width = 10.;
+ break;
+ case 5:
+ fMass = 0.;
+ fCharge = 0;
+ fPx *= 0.5;
+ fPy *= 1.5;
+ break;
+ };
+ fPz = gRandom->Gaus(4., 2.);
+ if (vertex) {
+ fVertex[0] = vertex[0];
+ fVertex[1] = vertex[1];
+ fVertex[2] = vertex[2];
+ } else {
+ fVertex[0] = gRandom->Gaus(0,vert_width);
+ fVertex[1] = gRandom->Gaus(0,vert_width);
+ fVertex[2] = gRandom->Gaus(0,0.01);
+ }
+}
+
+//______________________________________________________________________________
+Bool_t AnaTrack::Decay(Double_t &px1, Double_t &py1, Double_t &pz1,
+ Double_t &px2, Double_t &py2, Double_t &pz2)
+{
+// Decay a pi0 in 2 gammas.
+ if (fCharge != 0) return kFALSE;
+ if (fMass<0.132 || fMass>0.138) return kFALSE;
+ Double_t phi1 = 2.*TMath::Pi()*gRandom->Rndm(); // [0,2*pi]
+ Double_t phi2 = phi1 + TMath::Pi();
+ if (phi2 > 2.*TMath::Pi()) phi2 -= 2.*TMath::Pi();
+ Double_t r2 = gRandom->Rndm();
+ Double_t theta1 = TMath::ACos(1.-2.*r2);
+ Double_t p0 = GetP();
+ Double_t m0 = 0.135;
+ Double_t p1 = 0.5*(p0*(1-2*r2)+TMath::Sqrt(p0*p0*(1-2*r2)*(1-2*r2)+2*m0*m0));
+ Double_t p2 = TMath::Sqrt(p0*p0+m0*m0-p1*p1);
+ Double_t theta2 = TMath::ACos((p0-p1*(1-2*r2))/p2);
+ // Px, Py and Pz in the reference frame of the pion
+ px1 = p1 * TMath::Sin(theta1)*TMath::Cos(phi1);
+ px2 = p2 * TMath::Sin(theta2)*TMath::Cos(phi2);
+ py1 = p1 * TMath::Sin(theta1)*TMath::Sin(phi1);
+ py2 = p2 * TMath::Sin(theta2)*TMath::Sin(phi2);
+ pz1 = p1 * TMath::Cos(theta1);
+ pz2 = p2 * TMath::Cos(theta2);
+ Double_t phi = TMath::ATan2(fPy, fPx) * TMath::RadToDeg();
+ Double_t theta = TMath::ACos(GetPt()/p0) * TMath::RadToDeg();
+ TGeoRotation r("rot", phi+90., theta, 0.);
+ Double_t loc[3], vect[3];
+ p0 = TMath::Sqrt(px1*px1+py1*py1+pz1*pz1);
+ loc[0] = px1/p0;
+ loc[1] = py1/p0;
+ loc[2] = pz1/p0;
+ r.LocalToMasterVect(loc, vect);
+ px1 = vect[0]*p0;
+ py1 = vect[1]*p0;
+ pz1 = vect[2]*p0;
+// t1 = new AnaTrack(1., fVertex);
+ p0 = TMath::Sqrt(px2*px2+py2*py2+pz2*pz2);
+ loc[0] = px2/p0;
+ loc[1] = py2/p0;
+ loc[2] = pz2/p0;
+ r.LocalToMasterVect(loc, vect);
+ px2 = vect[0]*p0;
+ py2 = vect[1]*p0;
+ pz2 = vect[2]*p0;
+// t2 = new AnaTrack(1., fVertex);
+ return kTRUE;
+}
+
+//______________________________________________________________________________
+ClassImp(AnaEvent)
+
+TClonesArray *AnaEvent::fgTracks = 0;
+
+//______________________________________________________________________________
+AnaEvent::AnaEvent()
+{
+// Ctor
+ if (!fgTracks) fgTracks = new TClonesArray("AnaTrack", 2000);
+ fTracks = fgTracks;
+ fEventNumber = 0;
+ fNtracks = 0;
+}
+
+//______________________________________________________________________________
+AnaTrack *AnaEvent::AddTrack(Double_t rnd, Double_t *vert)
+{
+// Add a random track
+// printf("track %d\n", fNtracks);
+ TClonesArray &tracks = *fTracks;
+ AnaTrack *track = new(tracks[fNtracks++]) AnaTrack(rnd, vert);
+ return track;
+}
+
+//______________________________________________________________________________
+void AnaEvent::Clear(Option_t *)
+{
+// Clears current event.
+ fTracks->Clear();
+ fNtracks = 0;
+ fEventNumber = 0;
+}
+
+//______________________________________________________________________________
+Int_t AnaEvent::Build(Int_t ev)
+{
+// Create a random event
+ Clear();
+ fEventNumber = ev;
+ Int_t ntracks = Int_t(gRandom->Gaus(500., 100.));
+ if (ntracks < 1) ntracks = 1;
+ if (ntracks>1000) ntracks = 1000;
+ AnaTrack *track, *track0;
+ for (Int_t i=0; i<ntracks; i++) {
+ Double_t rnd = gRandom->Rndm();
+ if (rnd>=0.90 && rnd<0.95) {
+ // Pi0 -> decay the track in 2 gammas
+ track0 = new AnaTrack(rnd);
+ Double_t vert[3];
+ vert[0] = track0->GetVertex(0);
+ vert[1] = track0->GetVertex(1);
+ vert[2] = track0->GetVertex(2);
+ Double_t px1,py1,pz1,px2,py2,pz2;
+ if (track0->Decay(px1,py1,pz1,px2,py2,pz2)) {
+ track = AddTrack(1.,vert);
+ track->SetPx(px1);
+ track->SetPy(py1);
+ track->SetPz(pz1);
+ track = AddTrack(1.,vert);
+ track->SetPx(px2);
+ track->SetPy(py2);
+ track->SetPz(pz2);
+ }
+ delete track0;
+ } else {
+ track = AddTrack(rnd);
+ }
+ }
+ return fNtracks;
+}
+
+//______________________________________________________________________________
+void AnaEvent::CreateEvents(Int_t nevents, const char *filename)
+{
+// Create nevents in one tree and put them in filename.
+ TFile *hfile = new TFile(filename, "RECREATE", "Some AnaEvents...");
+ TTree *tree = new TTree("T", "Tree of AnaEvents");
+ tree->SetAutoSave(1000000000); // autosave when 1 Gbyte written
+ Int_t bufsize = 16000;
+ AnaEvent *event = new AnaEvent();
+ TBranch *branch = tree->Branch("event", &event, bufsize,1);
+ branch->SetAutoDelete(kFALSE);
+
+ for (Int_t ev=0; ev<nevents; ev++) {
+ Int_t ntracks = event->Build(ev);
+ if (ev%100 == 0) printf("event: %d ntracks=%d\n", ev, ntracks);
+ tree->Fill();
+ }
+ hfile->Write();
+ tree->Print();
+ hfile->Close();
+}
+
--- /dev/null
+#ifndef Ana_Event
+#define Ana_Event
+
+//////////////////////////////////////////////////////////////////////////
+// //
+// Simple event used for a simple analysis. The event has just a //
+// TClonesArray of tracks that can be either pi+/-, protons or //
+// gammas. Some ratio of all particles are pi0's that decay in //
+// 2 gammas. //
+// //
+// The analysis classes after the definition of AnaEvent/AnaTrack are //
+// just some simple tasks: //
+// //
+// TaskGenerate - task to generate 10k events in a tree "T" split in //
+// 5 files: input_n.root //
+// TaskFilter - task to filter just gammas from the inputs and //
+// write them to a single output file //
+// TaskReco - task to reconstruct pi0's from the mixed background //
+// +signal of gammas //
+// //
+//////////////////////////////////////////////////////////////////////////
+
+#include "TTree.h"
+#include "TFile.h"
+#include "TRandom.h"
+#include "TGeoMatrix.h"
+
+#include "AliAnalysisTask.h"
+#include "AliAnalysisManager.h"
+#include "AliAnalysisDataContainer.h"
+
+class AnaTrack;
+class AnaEvent;
+
+//
+// This task will work without using TSelector functionality
+// No Init() or Terminate() need to be defined. No input/output
+// slots are defined; th task will simply create several output files
+//
+//______________________________________________________________________________
+class TaskGenerate : public AliAnalysisTask {
+
+public:
+ TaskGenerate(const char *name) : AliAnalysisTask(name,"") {}
+ virtual ~TaskGenerate() {}
+
+ virtual void Exec(Option_t *option);
+ ClassDef(TaskGenerate,0) // Simple generator
+};
+
+// The next task is filtering the input events coming from a chain and having
+// more than 100 gammas. In Terminate() some histogram will be drawn
+
+//______________________________________________________________________________
+class TaskFilter : public AliAnalysisTask {
+private:
+ AnaEvent *fEvent; // Current event
+ TTree *fOutput; // Output tree
+ TList *fList; // List containing the output data
+ TH1I *fHist1; // Number of gammas per event
+ TH1I *fHist2; // Number of gammas per event
+public:
+ TaskFilter(const char *name);
+ virtual ~TaskFilter() {}
+
+ virtual void Init(Option_t *);
+ virtual void Exec(Option_t *option);
+ virtual void Terminate(Option_t *);
+ ClassDef(TaskFilter,0) // Event filter
+};
+
+// This task reconstructs pi0's for gammas coming from the same vertex
+//______________________________________________________________________________
+class TaskRecoPi0 : public AliAnalysisTask {
+private:
+ AnaEvent *fEvent; // Current event
+ TObjArray *fGammas; // Array of gammas
+ TObjArray *fPions; // Array of pi0's
+ TH1F *fHist; // Pt distrib. of reconstructed pions
+public:
+ TaskRecoPi0(const char *name);
+ virtual ~TaskRecoPi0();
+
+ virtual void Init(Option_t *);
+ virtual void Exec(Option_t *option);
+ virtual void Terminate(Option_t *);
+ ClassDef(TaskRecoPi0,0) // Pi0 reconstructor
+};
+
+//______________________________________________________________________________
+class AnaTrack : public TObject {
+
+private:
+ Double_t fPx; // X component of the momentum
+ Double_t fPy; // Y component of the momentum
+ Double_t fPz; // Z component of the momentum
+ Float_t fMass; // The mass of this particle
+ Int_t fCharge; // Charge
+ Double_t fVertex[3]; // Track vertex position
+
+public:
+ AnaTrack() {}
+ AnaTrack(Double_t random, Double_t *vertex=0);
+ AnaTrack(Double_t px, Double_t py, Double_t pz, Float_t mass, Int_t charge,
+ Double_t vx, Double_t vy, Double_t vz) : TObject(), fPx(px), fPy(py), fPz(pz), fMass(mass), fCharge(charge)
+ {fVertex[0]=vx; fVertex[1]=vy; fVertex[2]=vz;}
+ virtual ~AnaTrack() {}
+
+ Bool_t Decay(Double_t &px1, Double_t &py1, Double_t &pz1,
+ Double_t &px2, Double_t &py2, Double_t &pz2);
+ Double_t GetPx() const {return fPx;}
+ Double_t GetPy() const {return fPy;}
+ Double_t GetPz() const {return fPz;}
+ void SetPx(Double_t px) {fPx = px;}
+ void SetPy(Double_t py) {fPy = py;}
+ void SetPz(Double_t pz) {fPz = pz;}
+ Double_t GetPt() const {return TMath::Sqrt(fPx*fPx + fPy*fPy);}
+ Double_t GetP() const {return TMath::Sqrt(fPx*fPx + fPy*fPy + fPz*fPz);}
+ Double_t GetMass() const {return fMass;}
+ Double_t GetCharge() const {return fCharge;}
+ Double_t GetVertex(Int_t i) const {return (i<3)?fVertex[i]:0.;}
+
+ ClassDef(AnaTrack,1) // A simple track
+};
+
+//______________________________________________________________________________
+class AnaEvent : public TObject {
+
+private:
+ Int_t fEventNumber; // Event number
+ Int_t fNtracks; // Number of tracks
+ TClonesArray *fTracks; //-> Array of all tracks
+
+ static TClonesArray *fgTracks;
+
+public:
+ AnaEvent();
+ virtual ~AnaEvent() {Clear();}
+
+ AnaTrack *AddTrack(Double_t rnd, Double_t *vert=0);
+ Int_t Build(Int_t ev);
+ static void CreateEvents(Int_t nevents, const char *filename);
+ void Clear(Option_t *option="");
+
+ Int_t GetEvtNumber() const {return fEventNumber;}
+ Int_t GetNtracks() const {return fNtracks;}
+ AnaTrack *GetTrack(Int_t i) {return (AnaTrack*)fTracks->At(i);}
+
+ClassDef(AnaEvent,1) // An event with tracks
+};
+
+#endif
git://git.uio.no / u/mrichter/AliRoot.git / commitdiff