* provided "as is" without express or implied warranty. *
**************************************************************************/
+
//---------------------------------------------------------------------
-// FastJet finder
-// interface to FastJet algorithm
+// FastJet v2.3.4 finder algorithm interface
+//
// Author: Rafael.Diaz.Valdes@cern.ch
-// kt using NlnN
+//
//---------------------------------------------------------------------
#include <Riostream.h>
#include "AliJetReaderHeader.h"
#include "AliJetReader.h"
#include "AliJet.h"
-//for FastJet finder
-#include "FjPseudoJet.hh"
-#include "FjClusterSequence.hh"
+
+
+#include "fastjet/PseudoJet.hh"
+#include "fastjet/ClusterSequenceArea.hh"
+#include "fastjet/AreaDefinition.hh"
+#include "fastjet/JetDefinition.hh"
+// get info on how fastjet was configured
+#include "fastjet/config.h"
+
+#ifdef ENABLE_PLUGIN_SISCONE
+#include "fastjet/SISConePlugin.hh"
+#endif
+
+#include<sstream> // needed for internal io
+#include<vector>
+#include <cmath>
+
+using namespace std;
ClassImp(AliFastJetFinder);
-////////////////////////////////////////////////////////////////////////
+//____________________________________________________________________________
AliFastJetFinder::AliFastJetFinder():
- AliJetFinder(),
- fHeader(0x0),
- fLego(0x0),
- fLegoSignal(0x0)
+ AliJetFinder()
{
// Constructor
}
-////////////////////////////////////////////////////////////////////////
+//____________________________________________________________________________
AliFastJetFinder::~AliFastJetFinder()
-
{
// destructor
}
-////////////////////////////////////////////////////////////////////////
-
-
+//______________________________________________________________________________
void AliFastJetFinder::FindJets()
-
{
- //create cells and jets array
- // 1) transform input to pt,eta,phi plus lego
+
+ Bool_t debug = kFALSE;
+
+ //pick up fastjet header
+ AliFastJetHeader *header = (AliFastJetHeader*)fHeader;
+
+ // check if we are reading AOD jets
+ TRefArray *refs = 0;
+ Bool_t fromAod = !strcmp(fReader->ClassName(),"AliJetAODReader");
+ if (fromAod) { refs = fReader->GetReferences(); }
+
+ // RUN ALGORITHM
+ // read input particles -----------------------------
+ vector<fastjet::PseudoJet> input_particles;
TClonesArray *lvArray = fReader->GetMomentumArray();
+ if(lvArray == 0) { cout << "Could not get the momentum array" << endl; return; }
Int_t nIn = lvArray->GetEntries();
- if (nIn == 0) return;
-
- // local arrays for particles input
- Float_t* enT = new Float_t[nIn];
- Float_t* ptT = new Float_t[nIn];
- Float_t* etaT = new Float_t[nIn];
- Float_t* phiT = new Float_t[nIn];
- Int_t* injet = new Int_t[nIn];
-
-
- //total energy in array
- Float_t EtTotal = 0.0;
- Float_t meanptCell = 0.0;
- Float_t sqptCell = 0.0;
-
-
- // load input vectors in fLego
- for (Int_t i = 0; i < nIn; i++){
- TLorentzVector *lv = (TLorentzVector*) lvArray->At(i);
- enT[i] = lv->Energy();
- ptT[i] = lv->Pt();
- etaT[i] = lv->Eta();
- phiT[i] = ((lv->Phi() < 0) ? (lv->Phi()) + 2 * TMath::Pi() : lv->Phi());
- if (fReader->GetCutFlag(i) == 1){
- fLego->Fill(etaT[i], phiT[i], ptT[i]);
- if(fReader->GetSignalFlag(i) == 1)
- fLegoSignal->Fill(etaT[i], phiT[i], ptT[i]);
- EtTotal= EtTotal+ptT[i];
- }
- }
- fJets->SetNinput(nIn);
-
- // add soft background fixed
- Int_t nsoft = (fHeader->GetLegoNbinEta())*(fHeader->GetLegoNbinPhi());
- Float_t* ptRndm = new Float_t[nsoft];
- if(fHeader->AddSoftBackg()){
- gRandom->RndmArray(nsoft,ptRndm);
- for(Int_t isoft = 0; isoft < nsoft; isoft++){
- Float_t ptsoft = 0.005*ptRndm[isoft];
- EtTotal= EtTotal+ptsoft;
- }
- }
-
- if(EtTotal == 0){
- delete enT;
- delete ptT;
- delete etaT;
- delete phiT;
- return;
- }
-
- //cell array
- Float_t* etCell = new Float_t[90000]; //! Cell Energy // check enough space! *to be done*
- Float_t* etaCell = new Float_t[90000]; //! Cell eta
- Float_t* phiCell = new Float_t[90000]; //! Cell phi
- Int_t* jetflagCell = new Int_t[90000]; //! Cell flag for jets
- Float_t* etsigCell = new Float_t[90000]; // signal in this cell
-
- //jets array
- Float_t* etaJet = new Float_t[200];
- Float_t* phiJet = new Float_t[200];
- Float_t* etJet = new Float_t[200];
- Float_t* etsigJet = new Float_t[200]; //signal energy
- Float_t* etallJet = new Float_t[200]; //total energy in jet area
- Int_t* ncellsJet = new Int_t[200];
- memset(etaJet,0,sizeof(Float_t)*200);
- memset(phiJet,0,sizeof(Float_t)*200);
- memset(etJet,0,sizeof(Float_t)*200);
- memset(etsigJet,0,sizeof(Float_t)*200);
- memset(etallJet,0,sizeof(Float_t)*200);
- memset(ncellsJet,0,sizeof(Int_t)*200);
-
-
-
- // load cells arrays
- Int_t nCell = 0;
- TAxis* xaxis = fLego->GetXaxis();
- TAxis* yaxis = fLego->GetYaxis();
- Float_t e = 0.0; Float_t esig = 0.0;
-
- for (Int_t ib = 1; ib <= fHeader->GetLegoNbinEta(); ib++) {
- for (Int_t jb = 1; jb <= fHeader->GetLegoNbinPhi(); jb++) {
- e = fLego->GetBinContent(ib,jb);
- if (e < 0.0) continue; // don't include this cells
- Float_t eta = xaxis->GetBinCenter(ib);
- Float_t phi = yaxis->GetBinCenter(jb);
- if(fHeader->AddSoftBackg())
- etCell[nCell] = e + 0.005*ptRndm[nCell];
- else
- etCell[nCell] = e;
- sqptCell = sqptCell + etCell[nCell]*etCell[nCell]; // xi^2 ////////
- etaCell[nCell] = eta;
- phiCell[nCell] = phi;
- jetflagCell[nCell] = -1; //default
- esig = fLegoSignal->GetBinContent(ib,jb);
- if(esig > 0.0)
- etsigCell[nCell] = esig;
- else
- etsigCell[nCell] = 0.0;
- nCell++;
- }
- }
-
- meanptCell = EtTotal/(Float_t)nCell;
- sqptCell = sqptCell/(Float_t)nCell;
-
- Int_t nJets = 0;
- //call to FastJet Algorithm
- RunAlgorithm(nJets,etJet,etaJet,phiJet,etsigJet,etallJet,ncellsJet,
- nCell,etCell,etaCell,phiCell,etsigCell,jetflagCell);
-
-
- //subtract background
- SubtractBackg(nCell,jetflagCell,etCell,
- nJets,etJet,etallJet,ncellsJet,
- meanptCell,sqptCell,EtTotal);
-
-
- // add jets to list
- Int_t* index = new Int_t[nJets];
- Int_t nj = 0;
- for(Int_t kj=0; kj<nJets; kj++){
- if ((etaJet[kj] > (fHeader->GetJetEtaMax())) ||
- (etaJet[kj] < (fHeader->GetJetEtaMin())) ||
- (etJet[kj] < fHeader->GetMinJetEt())) continue; // acceptance eta range and etmin
- Float_t px, py,pz,en; // convert to 4-vector
- px = etJet[kj] * TMath::Cos(phiJet[kj]);
- py = etJet[kj] * TMath::Sin(phiJet[kj]);
- pz = etJet[kj] / TMath::Tan(2.0 * TMath::ATan(TMath::Exp(-etaJet[kj])));
- en = TMath::Sqrt(px * px + py * py + pz * pz);
- fJets->AddJet(px, py, pz, en);
- index[nj] = kj;
- nj++;
- }
-
- //add signal percentage and total signal in AliJets for analysis tool
- Float_t* percentage = new Float_t[nj];
- Int_t* ncells = new Int_t[nj];
- Int_t* mult = new Int_t[nj];
-
- for(Int_t i = 0; i< nj; i++){
- percentage[i] = etsigJet[index[i]]/etJet[index[i]];
- ncells[i] = ncellsJet[index[i]];
- }
-
- //reorder injet flags
- for(Int_t ipar = 0; ipar < nIn; ipar++){
- Float_t injetflag =0;
- Int_t iparCell = fLego->FindBin(etaT[ipar], phiT[ipar]);
- injet[ipar] = jetflagCell[iparCell];
- for(Int_t js = 0; js < nj; js++){
- if(injet[ipar] == index[js]){
- injet[ipar] = js; // set the new jet id value
- mult[js]++; // add multiplicity in jet js
- injetflag = 1;
- break;
- }
- }
- if(injetflag == 0) injet[ipar] = -1; // set default value
+ if(nIn == 0) { if (debug) cout << "entries = 0 ; Event empty !!!" << endl ; return; }
+ Int_t nJets = 0; // n jets in this event
+ fJets->SetNinput(nIn) ; // number of input objects
+ Float_t px,py,pz,en;
+ // load input vectors
+ for(Int_t i = 0; i < nIn; i++){ // loop for all input particles
+ TLorentzVector *lv = (TLorentzVector*) lvArray->At(i);
+ px = lv->Px();
+ py = lv->Py();
+ pz = lv->Pz();
+ en = lv->Energy();
+
+ fastjet::PseudoJet input_part(px,py,pz,en); // create PseudoJet object
+ input_part.set_user_index(i); //label the particle into Fastjet algortihm
+ input_particles.push_back(input_part); // back of the input_particles vector
+ } // end loop
+
+
+ // create an object that represents your choice of jet algorithm, and
+ // the associated parameters
+ double Rparam = header->GetRparam();
+ fastjet::Strategy strategy = header->GetStrategy();
+ fastjet::RecombinationScheme recomb_scheme = header->GetRecombScheme();
+ fastjet::JetAlgorithm algorithm = header->GetAlgorithm();
+ fastjet::JetDefinition jet_def(algorithm, Rparam, recomb_scheme, strategy);
+
+
+ // create an object that specifies how we to define the area
+ fastjet::AreaDefinition area_def;
+ double ghost_etamax = header->GetGhostEtaMax();
+ double ghost_area = header->GetGhostArea();
+ int active_area_repeats = header->GetActiveAreaRepeats();
+
+ // now create the object that holds info about ghosts
+ fastjet::GhostedAreaSpec ghost_spec(ghost_etamax, active_area_repeats, ghost_area);
+ // and from that get an area definition
+ fastjet::AreaType area_type = header->GetAreaType();
+ area_def = fastjet::AreaDefinition(area_type,ghost_spec);
+
+ // run the jet clustering with the above jet definition
+ fastjet::ClusterSequenceArea clust_seq(input_particles, jet_def, area_def);
+
+
+ // save a comment in the header
+
+ TString comment = "Running FastJet algorithm with the following setup. ";
+ comment+= "Jet definition: ";
+ comment+= TString(jet_def.description());
+ comment+= ". Area definition: ";
+ comment+= TString(area_def.description());
+ comment+= ". Strategy adopted by FastJet: ";
+ comment+= TString(clust_seq.strategy_string());
+ header->SetComment(comment);
+ if(debug){
+ cout << "--------------------------------------------------------" << endl;
+ cout << comment << endl;
+ cout << "--------------------------------------------------------" << endl;
}
-
-
- fJets->SetNCells(ncells);
- fJets->SetPtFromSignal(percentage);
- fJets->SetMultiplicities(mult);
- fJets->SetInJet(injet);
- fJets->SetEtaIn(etaT);
- fJets->SetPhiIn(phiT);
- fJets->SetPtIn(ptT);
- fJets->SetEtAvg(meanptCell);
-
- //delete
- delete enT;
- delete ptT;
- delete etaT;
- delete phiT;
- delete injet;
- //cells
- delete etCell;
- delete etaCell;
- delete phiCell;
- delete jetflagCell;
- delete etsigCell;
- //jets
- delete etaJet;
- delete phiJet;
- delete etJet;
- delete etsigJet;
- delete etallJet;
- delete ncellsJet;
-
- delete index;
- delete percentage;
- delete ncells;
- delete mult;
- delete ptRndm;
-
+ //header->PrintParameters();
+
+
+ // extract the inclusive jets with pt > ptmin, sorted by pt
+ double ptmin = header->GetPtMin();
+ vector<fastjet::PseudoJet> inclusive_jets = clust_seq.inclusive_jets(ptmin);
+
+ //cout << "Number of unclustered particles: " << clust_seq.unclustered_particles().size() << endl;
+
+
+ //subtract background // ===========================================
+ // set the rapididty , phi range within which to study the background
+ double rap_max = header->GetRapMax();
+ double rap_min = header->GetRapMin();
+ double phi_max = header->GetPhiMax();
+ double phi_min = header->GetPhiMin();
+ fastjet::RangeDefinition range(rap_min, rap_max, phi_min, phi_max);
+ // subtract background
+ vector<fastjet::PseudoJet> sub_jets = clust_seq.subtracted_jets(range,ptmin);
+
+ // print out
+ //cout << "Printing inclusive sub jets with pt > "<< ptmin<<" GeV\n";
+ //cout << "---------------------------------------\n";
+ //cout << endl;
+ //printf(" ijet rap phi Pt area +- err\n");
+
+ // sort jets into increasing pt
+ vector<fastjet::PseudoJet> jets = sorted_by_pt(sub_jets);
+ for (size_t j = 0; j < jets.size(); j++) { // loop for jets
+
+ double area = clust_seq.area(jets[j]);
+ double area_error = clust_seq.area_error(jets[j]);
+
+ //printf("%5u %9.5f %8.5f %10.3f %8.3f +- %6.3f\n",j,jets[j].rap(),jets[j].phi(),jets[j].perp(), area, area_error);
+
+ // go to write AOD info
+ AliAODJet aodjet (jets[j].px(), jets[j].py(), jets[j].pz(), jets[j].E());
+ //cout << "Printing jet " << endl;
+ if(debug) aodjet.Print("");
+ //cout << "Adding jet ... " ;
+ AddJet(aodjet);
+ //cout << "added \n" << endl;
+
+ } // end loop for jets
+
+
}
-////////////////////////////////////////////////////////////////////////
-void AliFastJetFinder::RunAlgorithm(Int_t& nJets,Float_t* etJet,Float_t* etaJet,Float_t* phiJet,
- Float_t* etsigJet, Float_t* etallJet, Int_t* ncellsJet,
- Int_t& nCell,Float_t* etCell,Float_t* etaCell,Float_t* phiCell,
- Float_t* etsigCell, Int_t* jetflagCell)
-{
- //FastJet objects
- vector<FjPseudoJet> input_cells; // create a vector
- for (Int_t i = 0; i < nCell; i++){
- if(etCell[i] == 0.0) continue; // not include cell empty
- Double_t px, py,pz,en; // convert to 4-vector
- px = etCell[i]*TMath::Cos(phiCell[i]);
- py = etCell[i]*TMath::Sin(phiCell[i]);
- pz = etCell[i]/TMath::Tan(2.0 * TMath::ATan(TMath::Exp(-etaCell[i])));
- en = TMath::Sqrt(px * px + py * py + pz * pz);
- FjPseudoJet input_cell(px,py,pz,en); // create FjPseudoJet object
- input_cell.set_user_index(i); //label the cell into Fastjet algortihm
- //push FjPseudoJet of (px,py,pz,en) onto back of the input_cells
- input_cells.push_back(input_cell);
- }
-
- //run the jet clustering with option R=1.0 and strategy= Best
- Double_t Rparam = fHeader->GetRadius(); // default 1.0;
- FjClusterSequence clust_seq(input_cells,Rparam);
-
-
- //vector to get clusters
- vector<FjPseudoJet> clusters;
-
- ///////////////////////////////////////////////////////////////////////////
- //extract the inclusive jets with pt> ptmin sorted by pt
- //Float_t areaT = 4*(fHeader->GetLegoEtaMax())*TMath::Pi();
- // Double_t ptbgRc = EtBackgT*(Rparam*Rparam*TMath::Pi()/areaT);
- // Double_t ptbgRcfluct = dEtTotal*Rparam*TMath::Sqrt(TMath::Pi()/areaT);
- // Double_t ptmin = ptbgRc + ptbgRcfluct;
- clusters = clust_seq.inclusive_jets(0);
- //////////////////////////////////////////////////////////////////////////
-
- /////////////////////////////////////////////////////////////////////////
- //extract the exclusive jets with dcut = 25 GeV**2 and sort them in order
- //of increasing pt
- //Float_t areaT = 4*(fHeader->GetLegoEtaMax())*TMath::Pi();
- //Double_t ptbgRc = EtBackgT*(Rparam*Rparam*TMath::Pi()/areaT);
- //Double_t ptbgRcfluct = dEtTotal*Rparam*TMath::Sqrt(TMath::Pi()/areaT);
- //Double_t ptmin = ptbgRc + ptbgRcfluct;
- //Double_t ktbackg = (fHeader->GetKfactor())*ptmin;
- //Double_t dcut = ktbackg*ktbackg;
- //clusters = sorted_by_pt(clust_seq.exclusive_jets(dcut));
- //clusters = sorted_by_pt(clust_seq.exclusive_jets(5));
- /////////////////////////////////////////////////////////////////////////
-
-
- //cout << " ktClusters " << clusters.size() << endl;
- nJets = (Int_t)clusters.size();
- ////////////////////////////////////////////////////////////////////////
- // add all clusters to jet arrays
- for(UInt_t ij = 0; ij < clusters.size(); ij++){
- //constituents
- vector<FjPseudoJet> constituents = clust_seq.constituents(clusters[ij]);
- //fill jet array info
- ncellsJet[ij] = (Int_t)constituents.size();
- phiJet[ij] = clusters[ij].phi();
- Float_t angle = TMath::ATan(clusters[ij].perp()/clusters[ij].pz());
- angle = ((angle < 0) ? angle + TMath::Pi() : angle);
- etaJet[ij] = - TMath::Log(TMath::Tan(angle/2.0));
- etJet[ij] = clusters[ij].perp();
- //get constituents cells
- for(UInt_t jc = 0; jc < constituents.size(); jc++){ // loop for all cells in ij cluster
- Int_t jcell = constituents[jc].user_index();
- jetflagCell[jcell] = ij; //flag this cell for jet
- etsigJet[ij] = etsigJet[ij] + etsigCell[jcell]; // add signal of this cell
- etallJet[ij] = etallJet[ij] + etCell[jcell]; // add total of this cell
- }
- }
+//____________________________________________________________________________
+void AliFastJetFinder::RunTest(const char* datafile)
-}
-////////////////////////////////////////////////////////////////////////
-void AliFastJetFinder::SubtractBackg(Int_t& nCell, Int_t* jetflagCell, Float_t* etCell,
- Int_t& nJets, Float_t* etJet, Float_t* etallJet, Int_t* ncellsJet,
- Float_t& meanptCell, Float_t& sqptCell, Float_t& etBackg)
{
- // simplest method: subtract background from external region to jets
-
- //tmp array to flag jets
- Int_t flagJet[200];
- //tmp array to flag jet-cell status
- Int_t tmpjetflagCell[90000];
-
- Float_t etBackgOld = 0;
- Float_t prec = fHeader->GetPrecBg();
- Float_t bgprec = 1;
-
- while(bgprec > prec){
- //clear tmpjetflagCell
- memset(tmpjetflagCell,-1,sizeof(Int_t)*90000); // init with -1 (all cells are background)
- //clear flagjet
- memset(flagJet,0,sizeof(Int_t)*200); // init with 0 (no flag jets)
- // select clusters > meantmpCell
- for(Int_t i = 0; i < nJets; i++){
- Float_t iptcell = etallJet[i]/(Float_t)ncellsJet[i];
- if(iptcell < meanptCell) continue; // cluster not selected
- // convert tmp cell background to jet cell
- for(Int_t ic = 0; ic < nCell; ic++){ //loop for all cells
- if(jetflagCell[ic] != i) continue; // other cells
- tmpjetflagCell[ic] = i; // convert to a jet cell
- }
- //load total energy in cluster
- etJet[i] = etallJet[i];
- flagJet[i] = 1; // flag jet
- }
- //subtract background
- for(Int_t j = 0; j < nCell; j++){ // loop for all cells
- Int_t idxjet = tmpjetflagCell[j];
- if(idxjet == -1) continue; // background cell
- if(idxjet == -2) continue; // background protected cell
- etJet[idxjet] = etJet[idxjet] - meanptCell;
- }
- // evaluate background fluctuations (rms value)
- Float_t rmsptCell = TMath::Sqrt(sqptCell - meanptCell*meanptCell);
- //fake jets
- for(Int_t k = 0; k < nJets; k++){
- if(flagJet[k] != 1) continue; // only flaged jets
- //if(etJet[k] > fHeader->GetMinJetEt()) continue; // jet ok!!
- if(etJet[k] > rmsptCell*ncellsJet[k]) continue; // jet ok!!
- //clear tmpjetflag in cells
- for(Int_t kc = 0; kc < nCell; kc++){ //loop for all cells
- if(tmpjetflagCell[kc] != k) continue; // other cells
- tmpjetflagCell[kc] = -1; // convert to background tmp cell
- }
- // clear all previous jet flags
- etJet[k] = 0;
- flagJet[k] = 0;
- }
- // recalculate background
- sqptCell = 0;
- etBackgOld = etBackg;
- etBackg = 0;
- Int_t nCellBackg = 0;
- for(Int_t l = 0; l < nCell; l++){ // loop for all cells
- if(tmpjetflagCell[l] != -1) continue; // cell included in some jet or protected
- nCellBackg++;
- etBackg = etBackg + etCell[l]; //add cell to background
- //calc sqptCell
- sqptCell = sqptCell + etCell[l]*etCell[l];
- }
- if(nCellBackg){
- meanptCell = etBackg/(Float_t)nCellBackg; // new pt cell mean value
- sqptCell = sqptCell/(Float_t)nCellBackg;
- }else{
- meanptCell = 0;
- sqptCell = 0;
- }
- // evaluate presicion values
- if(etBackg)
- bgprec = (etBackgOld - etBackg)/etBackg;
- else
- bgprec = 0;
- }
- // set etJet 0 for all clusters not flaged in order to
- for(Int_t m = 0; m < nJets; m++){
- if(flagJet[m] == 1) continue; // flaged jets
- etJet[m] = 0; //others clusters
+ // This simple test run the kt algorithm for an ascii file testdata.dat
+ // read input particles -----------------------------
+ vector<fastjet::PseudoJet> input_particles;
+ Float_t px,py,pz,en;
+ ifstream in;
+ Int_t nlines = 0;
+ // we assume a file basic.dat in the current directory
+ // this file has 3 columns of float data
+ in.open(datafile);
+ while (1) {
+ in >> px >> py >> pz >> en;
+ if (!in.good()) break;
+ //printf("px=%8f, py=%8f, pz=%8fn",px,py,pz);
+ nlines++;
+ input_particles.push_back(fastjet::PseudoJet(px,py,pz,en));
}
+ //printf(" found %d pointsn",nlines);
+ in.close();
+ //////////////////////////////////////////////////
+
+ // create an object that represents your choice of jet algorithm, and
+ // the associated parameters
+ double Rparam = 1.0;
+ fastjet::Strategy strategy = fastjet::Best;
+ fastjet::RecombinationScheme recomb_scheme = fastjet::BIpt_scheme;
+ fastjet::JetDefinition jet_def(fastjet::kt_algorithm, Rparam, recomb_scheme, strategy);
+
+
+
+ // create an object that specifies how we to define the area
+ fastjet::AreaDefinition area_def;
+ double ghost_etamax = 7.0;
+ double ghost_area = 0.05;
+ int active_area_repeats = 1;
+
+
+ // now create the object that holds info about ghosts
+ fastjet::GhostedAreaSpec ghost_spec(ghost_etamax, active_area_repeats, ghost_area);
+ // and from that get an area definition
+ area_def = fastjet::AreaDefinition(fastjet::active_area,ghost_spec);
+
+
+ // run the jet clustering with the above jet definition
+ fastjet::ClusterSequenceArea clust_seq(input_particles, jet_def, area_def);
+
+
+ // tell the user what was done
+ cout << "--------------------------------------------------------" << endl;
+ cout << "Jet definition was: " << jet_def.description() << endl;
+ cout << "Area definition was: " << area_def.description() << endl;
+ cout << "Strategy adopted by FastJet was "<< clust_seq.strategy_string()<<endl<<endl;
+ cout << "--------------------------------------------------------" << endl;
+
+
+ // extract the inclusive jets with pt > 5 GeV, sorted by pt
+ double ptmin = 5.0;
+ vector<fastjet::PseudoJet> inclusive_jets = clust_seq.inclusive_jets(ptmin);
+
+ cout << "Number of unclustered particles: " << clust_seq.unclustered_particles().size() << endl;
+
+
+ //subtract background // ===========================================
+ // set the rapididty range within which to study the background
+ double rap_max = ghost_etamax - Rparam;
+ fastjet::RangeDefinition range(rap_max);
+ // subtract background
+ vector<fastjet::PseudoJet> sub_jets = clust_seq.subtracted_jets(range,ptmin);
+
+ // print them out //================================================
+ cout << "Printing inclusive jets after background subtraction \n";
+ cout << "------------------------------------------------------\n";
+ // sort jets into increasing pt
+ vector<fastjet::PseudoJet> jets = sorted_by_pt(sub_jets);
+
+ printf(" ijet rap phi Pt area +- err\n");
+ for (size_t j = 0; j < jets.size(); j++) {
+
+ double area = clust_seq.area(jets[j]);
+ double area_error = clust_seq.area_error(jets[j]);
+
+ printf("%5u %9.5f %8.5f %10.3f %8.3f +- %6.3f\n",j,jets[j].rap(),
+ jets[j].phi(),jets[j].perp(), area, area_error);
+ }
+ cout << endl;
+ // ================================================================
-
-}
-
-////////////////////////////////////////////////////////////////////////
-void AliFastJetFinder::SubtractBackgArea(Int_t& nCell, Int_t* jetflagCell,
- Float_t* etCell,Int_t&nJets, Float_t* etJet, Float_t* etallJet)
-{
- // area method: subtract background from external region to jets
- // using fixed area pi*Rc2
-
- // n cells contained in a cone Rc
- Double_t Rc = fHeader->GetRadius();
- Float_t nCellRc = Rc*Rc*TMath::Pi()/(0.015*0.015); // change in future !!!!
- //tmp array to flag fake jets
- Int_t fakeflagJet[100];
- memset(fakeflagJet,0,sizeof(Int_t)*100); // init with 0 (no fake jets)
- Int_t njfake = nJets;
- while(njfake > 0){
- //calc background per cell
- Int_t nCellBackg = 0;
- Float_t EtBackg = 0.0;
- for(Int_t i = 0; i < nCell; i++){ // loop for all cells
- if(jetflagCell[i] != -1) continue; // cell included in some jet
- nCellBackg++;
- EtBackg = EtBackg + etCell[i]; //add cell to background
- }
- //subtract background energy per jet
- for(Int_t l = 0; l < nJets; l++){
- if(fakeflagJet[l] == 1) continue; // fake jet
- etJet[l] = etallJet[l] - nCellRc*EtBackg/(Float_t)nCellBackg;
- }
- //fake jets analysis
- njfake = 0;
- for(Int_t k = 0; k < nJets; k++){
- if(fakeflagJet[k] == 1) continue; // fake jet
- if(etJet[k] < fHeader->GetMinJetEt()){ // a new fake jet
- //clear jet flag in cells
- for(Int_t kc = 0; kc < nCell; kc++){ //loop for all cells
- Int_t kidx = jetflagCell[kc];
- if(kidx != k) continue; // other cells
- jetflagCell[kc] = -1; // convert to background cell
- }
- fakeflagJet[k] = 1; // mark as a fake jet
- njfake++; //count fakes in this loop
- }
- }
- }
+
+
}
-////////////////////////////////////////////////////////////////////////
-
-
-
-void AliFastJetFinder::Reset()
-{
- fLego->Reset();
- fLegoSignal->Reset();
- fJets->ClearJets();
-
-}
-////////////////////////////////////////////////////////////////////////
+//____________________________________________________________________________
void AliFastJetFinder::WriteJHeaderToFile()
{
- fOut->cd();
fHeader->Write();
}
-////////////////////////////////////////////////////////////////////////
-
-void AliFastJetFinder::Init()
-{
- // initializes some variables
- // book lego
- fLego = new
- TH2F("legoH","eta-phi",
- fHeader->GetLegoNbinEta(), fHeader->GetLegoEtaMin(),
- fHeader->GetLegoEtaMax(), fHeader->GetLegoNbinPhi(),
- fHeader->GetLegoPhiMin(), fHeader->GetLegoPhiMax());
- fLegoSignal = new
- TH2F("legoSignalH","eta-phi signal",
- fHeader->GetLegoNbinEta(), fHeader->GetLegoEtaMin(),
- fHeader->GetLegoEtaMax(), fHeader->GetLegoNbinPhi(),
- fHeader->GetLegoPhiMin(), fHeader->GetLegoPhiMax());
-
-}
+//____________________________________________________________________________
\ No newline at end of file
git://git.uio.no / u / mrichter / AliRoot.git / commitdiff