1 /**************************************************************************
2 * Copyright(c) 1998-1999, ALICE Experiment at CERN, All rights reserved. *
4 * Author: The ALICE Off-line Project. *
5 * Contributors are mentioned in the code where appropriate. *
7 * Permission to use, copy, modify and distribute this software and its *
8 * documentation strictly for non-commercial purposes is hereby granted *
9 * without fee, provided that the above copyright notice appears in all *
10 * copies and that both the copyright notice and this permission notice *
11 * appear in the supporting documentation. The authors make no claims *
12 * about the suitability of this software for any purpose. It is *
13 * provided "as is" without express or implied warranty. *
14 **************************************************************************/
18 //---------------------------------------------------------------------
19 // UA1 Cone Algorithm Jet finder
20 // manages the search for jets
21 // Author: Rafael.Diaz.Valdes@cern.ch
23 //---------------------------------------------------------------------
26 #include <TClonesArray.h>
30 #include <TLorentzVector.h>
32 #include "AliUA1JetFinderV1.h"
33 #include "AliUA1JetHeaderV1.h"
34 #include "AliJetReaderHeader.h"
35 #include "AliJetReader.h"
37 #include "AliAODJet.h"
41 ClassImp(AliUA1JetFinderV1)
43 /////////////////////////////////////////////////////////////////////
45 AliUA1JetFinderV1::AliUA1JetFinderV1() :
52 ////////////////////////////////////////////////////////////////////////
54 AliUA1JetFinderV1::~AliUA1JetFinderV1()
62 ////////////////////////////////////////////////////////////////////////
65 void AliUA1JetFinderV1::FindJets()
68 //1) Fill cell map array
69 //2) calculate total energy and fluctuation level
71 // 3.1) look centroides in cell map
72 // 3.2) calculate total energy in cones
73 // 3.3) flag as a possible jet
74 // 3.4) reorder cones by energy
75 //4) subtract backg in accepted jets
78 // transform input to pt,eta,phi plus lego
80 AliUA1JetHeaderV1* header = (AliUA1JetHeaderV1*) fHeader;
81 TClonesArray *lvArray = fReader->GetMomentumArray();
82 Int_t nIn = lvArray->GetEntries();
85 // local arrays for input
86 Float_t* ptT = new Float_t[nIn];
87 Float_t* etaT = new Float_t[nIn];
88 Float_t* phiT = new Float_t[nIn];
89 Int_t* injet = new Int_t[nIn];
91 //total energy in array
92 Float_t etbgTotal = 0.0;
93 TH1F* hPtTotal = new TH1F("hPt","Pt distribution of all particles ",100,0.0,15.0);
95 // load input vectors and calculate total energy in array
96 for (Int_t i = 0; i < nIn; i++){
97 TLorentzVector *lv = (TLorentzVector*) lvArray->At(i);
100 phiT[i] = ((lv->Phi() < 0) ? (lv->Phi()) + 2 * TMath::Pi() : lv->Phi());
101 if (fReader->GetCutFlag(i) != 1) continue;
102 fLego ->Fill(etaT[i], phiT[i], ptT[i]);
103 hPtTotal->Fill(ptT[i]);
107 fJets->SetNinput(nIn);
109 // calculate total energy and fluctuation in map
110 Double_t meanpt = hPtTotal->GetMean();
111 Double_t ptRMS = hPtTotal->GetRMS();
112 Double_t npart = hPtTotal->GetEntries();
113 Double_t dEtTotal = (TMath::Sqrt(npart))*TMath::Sqrt(meanpt * meanpt + ptRMS*ptRMS);
115 // arrays to hold jets
116 Float_t* etaJet = new Float_t[30];
117 Float_t* phiJet = new Float_t[30];
118 Float_t* etJet = new Float_t[30];
119 Float_t* etsigJet = new Float_t[30]; //signal et in jet
120 Float_t* etallJet = new Float_t[30]; // total et in jet (tmp variable)
121 Int_t* ncellsJet = new Int_t[30];
122 Int_t* multJet = new Int_t[30];
123 Int_t nJets; // to hold number of jets found by algorithm
124 Int_t nj; // number of jets accepted
125 Float_t prec = header->GetPrecBg();
127 while(bgprec > prec){
128 //reset jet arrays in memory
129 memset(etaJet,0,sizeof(Float_t)*30);
130 memset(phiJet,0,sizeof(Float_t)*30);
131 memset(etJet,0,sizeof(Float_t)*30);
132 memset(etallJet,0,sizeof(Float_t)*30);
133 memset(etsigJet,0,sizeof(Float_t)*30);
134 memset(ncellsJet,0,sizeof(Int_t)*30);
135 memset(multJet,0,sizeof(Int_t)*30);
138 // reset particles-jet array in memory
139 memset(injet,-1,sizeof(Int_t)*nIn);
140 //run cone algorithm finder
141 RunAlgoritm(etbgTotal,dEtTotal,nJets,etJet,etaJet,phiJet,etallJet,ncellsJet);
142 //run background subtraction
143 if(nJets > header->GetNAcceptJets()) // limited number of accepted jets per event
144 nj = header->GetNAcceptJets();
147 //subtract background
148 Float_t etbgTotalN = 0.0; //new background
149 if(header->GetBackgMode() == 1) // standar
150 SubtractBackg(nIn,nj,etbgTotalN,ptT,etaT,phiT,etJet,etaJet,phiJet,etsigJet,multJet,injet);
151 if(header->GetBackgMode() == 2) //cone
152 SubtractBackgCone(nIn,nj,etbgTotalN,ptT,etaT,phiT,etJet,etaJet,phiJet,etsigJet,multJet,injet);
153 if(header->GetBackgMode() == 3) //ratio
154 SubtractBackgRatio(nIn,nj,etbgTotalN,ptT,etaT,phiT,etJet,etaJet,phiJet,etsigJet,multJet,injet);
155 if(header->GetBackgMode() == 4) //statistic
156 SubtractBackgStat(nIn,nj,etbgTotalN,ptT,etaT,phiT,etJet,etaJet,phiJet,etsigJet,multJet,injet);
158 if(etbgTotalN != 0.0)
159 bgprec = (etbgTotal - etbgTotalN)/etbgTotalN;
162 etbgTotal = etbgTotalN; // update with new background estimation
166 Int_t* idxjets = new Int_t[nj];
168 // printf("Found %d jets \n", nj);
171 Bool_t fromAod = !strcmp(fReader->ClassName(),"AliJetAODReader");
172 if (fromAod) refs = fReader->GetReferences();
173 for(Int_t kj=0; kj<nj; kj++){
174 if ((etaJet[kj] > (header->GetJetEtaMax())) ||
175 (etaJet[kj] < (header->GetJetEtaMin())) ||
176 (etJet[kj] < header->GetMinJetEt())) continue; // acceptance eta range and etmin
177 Float_t px, py,pz,en; // convert to 4-vector
178 px = etJet[kj] * TMath::Cos(phiJet[kj]);
179 py = etJet[kj] * TMath::Sin(phiJet[kj]);
180 pz = etJet[kj] / TMath::Tan(2.0 * TMath::ATan(TMath::Exp(-etaJet[kj])));
181 en = TMath::Sqrt(px * px + py * py + pz * pz);
182 fJets->AddJet(px, py, pz, en);
183 AliAODJet jet(px, py, pz, en);
186 for(Int_t jpart = 0; jpart < nIn; jpart++) // loop for all particles in array
187 if (injet[jpart] == kj && fReader->GetCutFlag(jpart) == 1)
188 jet.AddTrack(refs->At(jpart)); // check if the particle belongs to the jet and add the ref
195 idxjets[nselectj] = kj;
197 } //end particle loop
199 //add signal percentage and total signal in AliJets for analysis tool
200 Float_t* percentage = new Float_t[nselectj];
201 Int_t* ncells = new Int_t[nselectj];
202 Int_t* mult = new Int_t[nselectj];
203 for(Int_t i = 0; i< nselectj; i++){
204 percentage[i] = etsigJet[idxjets[i]]/etJet[idxjets[i]];
205 ncells[i] = ncellsJet[idxjets[i]];
206 mult[i] = multJet[idxjets[i]];
208 //add particle-injet relationship ///
209 for(Int_t bj = 0; bj < nIn; bj++){
210 if(injet[bj] == -1) continue; //background particle
212 for(Int_t ci = 0; ci< nselectj; ci++){
213 if(injet[bj] == idxjets[ci]){
219 if(bflag == 0) injet[bj] = -1; // set as background particle
221 fJets->SetNCells(ncells);
222 fJets->SetPtFromSignal(percentage);
223 fJets->SetMultiplicities(mult);
224 fJets->SetInJet(injet);
225 fJets->SetEtaIn(etaT);
226 fJets->SetPhiIn(phiT);
228 fJets->SetEtAvg(etbgTotal/(4*(header->GetLegoEtaMax())*TMath::Pi()));
245 delete [] percentage;
252 ////////////////////////////////////////////////////////////////////////
254 void AliUA1JetFinderV1::RunAlgoritm(Float_t etbgTotal, Double_t dEtTotal, Int_t& nJets,
255 Float_t* etJet,Float_t* etaJet, Float_t* phiJet,
256 Float_t* etallJet, Int_t* ncellsJet)
260 AliUA1JetHeaderV1* header = (AliUA1JetHeaderV1*) fHeader;
261 const Int_t nBinsMax = 120000; // we use a fixed array not to fragment memory
263 const Int_t nBinEta = header->GetLegoNbinEta();
264 const Int_t nBinPhi = header->GetLegoNbinPhi();
265 if((nBinPhi*nBinEta)>nBinsMax){
266 AliError("Too many bins of the ETA-PHI histogram");
269 Float_t etCell[nBinsMax]; //! Cell Energy
270 Float_t etaCell[nBinsMax]; //! Cell eta
271 Float_t phiCell[nBinsMax]; //! Cell phi
272 Short_t flagCell[nBinsMax]; //! Cell flag
275 TAxis* xaxis = fLego->GetXaxis();
276 TAxis* yaxis = fLego->GetYaxis();
278 for (Int_t i = 1; i <= nBinEta; i++) {
279 for (Int_t j = 1; j <= nBinPhi; j++) {
280 e = fLego->GetBinContent(i,j);
281 if (e < 0.0) continue; // don't include this cells
282 Float_t eta = xaxis->GetBinCenter(i);
283 Float_t phi = yaxis->GetBinCenter(j);
285 etaCell[nCell] = eta;
286 phiCell[nCell] = phi;
287 flagCell[nCell] = 0; //default
292 // Parameters from header
293 Float_t minmove = header->GetMinMove();
294 Float_t maxmove = header->GetMaxMove();
295 Float_t rc = header->GetRadius();
296 Float_t etseed = header->GetEtSeed();
297 //Float_t etmin = header->GetMinJetEt();
301 // tmp array of jets form algoritm
302 Float_t etaAlgoJet[30];
303 Float_t phiAlgoJet[30];
304 Float_t etAlgoJet[30];
305 Int_t ncellsAlgoJet[30];
310 Int_t * index = new Int_t[nCell];
311 TMath::Sort(nCell, etCell, index);
312 // variable used in centroide loop
331 for(Int_t icell = 0; icell < nCell; icell++){
332 Int_t jcell = index[icell];
333 if(etCell[jcell] <= etseed) continue; // if cell energy is low et seed
334 if(flagCell[jcell] != 0) continue; // if cell was used before
335 eta = etaCell[jcell];
336 phi = phiCell[jcell];
347 for(Int_t kcell =0; kcell < nCell; kcell++){
348 Int_t lcell = index[kcell];
349 if(lcell == jcell) continue; // cell itself
350 if(flagCell[lcell] != 0) continue; // cell used before
351 if(etCell[lcell] > etCell[jcell]) continue; // can this happen
353 deta = etaCell[lcell] - eta;
354 dphi = TMath::Abs(phiCell[lcell] - phi);
355 if (dphi > TMath::Pi()) dphi = 2. * TMath::Pi() - dphi;
356 dr = TMath::Sqrt(deta * deta + dphi * dphi);
358 // calculate offset from initiate cell
359 deta = etaCell[lcell] - eta0;
360 dphi = phiCell[lcell] - phi0;
361 if (dphi < - TMath::Pi()) dphi= dphi + 2.0 * TMath::Pi();
362 if (dphi > TMath::Pi()) dphi = dphi - 2.0 * TMath::Pi();
364 etas = etas + etCell[lcell]*deta;
365 phis = phis + etCell[lcell]*dphi;
366 ets = ets + etCell[lcell];
367 //new weighted eta and phi including this cell
368 eta = eta0 + etas/ets;
369 phi = phi0 + phis/ets;
370 // if cone does not move much, just go to next step
371 dphib = TMath::Abs(phi - phib);
372 if (dphib > TMath::Pi()) dphib = 2. * TMath::Pi() - dphib;
373 dr = TMath::Sqrt((eta-etab)*(eta-etab) + dphib * dphib);
374 if(dr <= minmove) break;
375 // cone should not move more than max_mov
376 dr = TMath::Sqrt((etas/ets)*(etas/ets) + (phis/ets)*(phis/ets));
383 } else { // store this loop information
391 }//end of cells loop looking centroide
393 //avoid cones overloap (to be implemented in the future)
395 //flag cells in Rc, estimate total energy in cone
396 Float_t etCone = 0.0;
398 rc = header->GetRadius();
399 for(Int_t ncell =0; ncell < nCell; ncell++){
400 if(flagCell[ncell] != 0) continue; // cell used before
402 deta = etaCell[ncell] - eta;
403 dphi = phiCell[ncell] - phi;
404 if (dphi < -TMath::Pi()) dphi= -dphi - 2.0 * TMath::Pi();
405 if (dphi > TMath::Pi()) dphi = 2.0 * TMath::Pi() - dphi;
406 dr = TMath::Sqrt(deta * deta + dphi * dphi);
407 if(dr <= rc){ // cell in cone
408 flagCell[ncell] = -1;
409 etCone+=etCell[ncell];
414 // select jets with et > background
415 // estimate max fluctuation of background in cone
416 Double_t ncellin = (Double_t)nCellIn;
417 Double_t ntcell = (Double_t)nCell;
418 Double_t etbmax = (etbgTotal + dEtTotal )*(ncellin/ntcell);
420 Double_t etcmin = etCone ; // could be used etCone - etmin !!
421 //desicions !! etbmax < etcmin
422 for(Int_t mcell =0; mcell < nCell; mcell++){
423 if(flagCell[mcell] == -1){
425 flagCell[mcell] = 1; //flag cell as used
427 flagCell[mcell] = 0; // leave it free
430 //store tmp jet info !!!
431 if(etbmax < etcmin) {
432 etaAlgoJet[nJets] = eta;
433 phiAlgoJet[nJets] = phi;
434 etAlgoJet[nJets] = etCone;
435 ncellsAlgoJet[nJets] = nCellIn;
439 } // end of cells loop
441 //reorder jets by et in cone
442 //sort jets by energy
443 Int_t * idx = new Int_t[nJets];
444 TMath::Sort(nJets, etAlgoJet, idx);
445 for(Int_t p = 0; p < nJets; p++){
446 etaJet[p] = etaAlgoJet[idx[p]];
447 phiJet[p] = phiAlgoJet[idx[p]];
448 etJet[p] = etAlgoJet[idx[p]];
449 etallJet[p] = etAlgoJet[idx[p]];
450 ncellsJet[p] = ncellsAlgoJet[idx[p]];
459 ////////////////////////////////////////////////////////////////////////
461 void AliUA1JetFinderV1::SubtractBackg(Int_t& nIn, Int_t&nJ, Float_t&etbgTotalN,
462 Float_t* ptT, Float_t* etaT, Float_t* phiT,
463 Float_t* etJet,Float_t* etaJet, Float_t* phiJet, Float_t* etsigJet,
464 Int_t* multJet, Int_t* injet)
466 //background subtraction using cone method but without correction in dE/deta distribution
468 //calculate energy inside and outside cones
469 AliUA1JetHeaderV1* header = (AliUA1JetHeaderV1*) fHeader;
470 Float_t rc= header->GetRadius();
473 for(Int_t jpart = 0; jpart < nIn; jpart++){ // loop for all particles in array
474 // if((fReader->GetCutFlag(jpart)) != 1) continue; // pt cut
475 for(Int_t ijet=0; ijet<nJ; ijet++){
476 Float_t deta = etaT[jpart] - etaJet[ijet];
477 Float_t dphi = phiT[jpart] - phiJet[ijet];
478 if (dphi < -TMath::Pi()) dphi= -dphi - 2.0 * TMath::Pi();
479 if (dphi > TMath::Pi()) dphi = 2.0 * TMath::Pi() - dphi;
480 Float_t dr = TMath::Sqrt(deta * deta + dphi * dphi);
481 if(dr <= rc){ // particles inside this cone
484 if((fReader->GetCutFlag(jpart)) == 1){ // pt cut
485 etIn[ijet] += ptT[jpart];
486 if(fReader->GetSignalFlag(jpart) == 1) etsigJet[ijet]+= ptT[jpart];
491 if(injet[jpart] == -1 && fReader->GetCutFlag(jpart) == 1)
492 etOut += ptT[jpart]; // particle outside cones and pt cut
493 } //end particle loop
495 //estimate jets and background areas
497 Float_t areaOut = 4*(header->GetLegoEtaMax())*TMath::Pi();
498 for(Int_t k=0; k<nJ; k++){
499 Float_t detamax = etaJet[k] + rc;
500 Float_t detamin = etaJet[k] - rc;
501 Float_t accmax = 0.0; Float_t accmin = 0.0;
502 if(detamax > header->GetLegoEtaMax()){ // sector outside etamax
503 Float_t h = header->GetLegoEtaMax() - etaJet[k];
504 accmax = rc*rc*TMath::ACos(h/rc) - h*TMath::Sqrt(rc*rc - h*h);
506 if(detamin < header->GetLegoEtaMin()){ // sector outside etamin
507 Float_t h = header->GetLegoEtaMax() + etaJet[k];
508 accmin = rc*rc*TMath::ACos(h/rc) - h*TMath::Sqrt(rc*rc - h*h);
510 areaJet[k] = rc*rc*TMath::Pi() - accmax - accmin;
511 areaOut = areaOut - areaJet[k];
513 //subtract background using area method
514 for(Int_t ljet=0; ljet<nJ; ljet++){
515 Float_t areaRatio = areaJet[ljet]/areaOut;
516 etJet[ljet] = etIn[ljet]-etOut*areaRatio; // subtraction
519 // estimate new total background
520 Float_t areaT = 4*(header->GetLegoEtaMax())*TMath::Pi();
521 etbgTotalN = etOut*areaT/areaOut;
526 ////////////////////////////////////////////////////////////////////////
528 void AliUA1JetFinderV1::SubtractBackgStat(Int_t& nIn, Int_t&nJ,Float_t&etbgTotalN,
529 Float_t* ptT, Float_t* etaT, Float_t* phiT,
530 Float_t* etJet,Float_t* etaJet, Float_t* phiJet, Float_t* etsigJet,
531 Int_t* multJet, Int_t* injet)
534 //background subtraction using statistical method
535 AliUA1JetHeaderV1* header = (AliUA1JetHeaderV1*) fHeader;
536 Float_t etbgStat = header->GetBackgStat(); // pre-calculated background
538 //calculate energy inside
539 Float_t rc= header->GetRadius();
542 for(Int_t jpart = 0; jpart < nIn; jpart++){ // loop for all particles in array
543 //if((fReader->GetCutFlag(jpart)) != 1) continue; // pt cut
544 for(Int_t ijet=0; ijet<nJ; ijet++){
545 Float_t deta = etaT[jpart] - etaJet[ijet];
546 Float_t dphi = phiT[jpart] - phiJet[ijet];
547 if (dphi < -TMath::Pi()) dphi= -dphi - 2.0 * TMath::Pi();
548 if (dphi > TMath::Pi()) dphi = 2.0 * TMath::Pi() - dphi;
549 Float_t dr = TMath::Sqrt(deta * deta + dphi * dphi);
550 if(dr <= rc){ // particles inside this cone
553 if((fReader->GetCutFlag(jpart)) == 1){ // pt cut
554 etIn[ijet]+= ptT[jpart];
555 if(fReader->GetSignalFlag(jpart) == 1) etsigJet[ijet] += ptT[jpart];
560 } //end particle loop
564 Float_t areaOut = 4*(header->GetLegoEtaMax())*TMath::Pi();
565 for(Int_t k=0; k<nJ; k++){
566 Float_t detamax = etaJet[k] + rc;
567 Float_t detamin = etaJet[k] - rc;
568 Float_t accmax = 0.0; Float_t accmin = 0.0;
569 if(detamax > header->GetLegoEtaMax()){ // sector outside etamax
570 Float_t h = header->GetLegoEtaMax() - etaJet[k];
571 accmax = rc*rc*TMath::ACos(h/rc) - h*TMath::Sqrt(rc*rc - h*h);
573 if(detamin < header->GetLegoEtaMin()){ // sector outside etamin
574 Float_t h = header->GetLegoEtaMax() + etaJet[k];
575 accmin = rc*rc*TMath::ACos(h/rc) - h*TMath::Sqrt(rc*rc - h*h);
577 areaJet[k] = rc*rc*TMath::Pi() - accmax - accmin;
580 //subtract background using area method
581 for(Int_t ljet=0; ljet<nJ; ljet++){
582 Float_t areaRatio = areaJet[ljet]/areaOut;
583 etJet[ljet] = etIn[ljet]-etbgStat*areaRatio; // subtraction
586 etbgTotalN = etbgStat;
590 ////////////////////////////////////////////////////////////////////////
592 void AliUA1JetFinderV1::SubtractBackgCone(Int_t& nIn, Int_t&nJ,Float_t& etbgTotalN,
593 Float_t* ptT, Float_t* etaT, Float_t* phiT,
594 Float_t* etJet,Float_t* etaJet, Float_t* phiJet, Float_t* etsigJet,
595 Int_t* multJet, Int_t* injet)
597 // Cone background subtraction method taking into acount dEt/deta distribution
598 AliUA1JetHeaderV1* header = (AliUA1JetHeaderV1*) fHeader;
600 Float_t rc= header->GetRadius();
601 Float_t etamax = header->GetLegoEtaMax();
602 Float_t etamin = header->GetLegoEtaMin();
605 // jet energy and area arrays
608 for(Int_t mjet=0; mjet<nJ; mjet++){
609 char hEtname[256]; char hAreaname[256];
610 sprintf(hEtname, "hEtJet%d", mjet); sprintf(hAreaname, "hAreaJet%d", mjet);
611 hEtJet[mjet] = new TH1F(hEtname,"et dist in eta ",ndiv,etamin,etamax);
612 hAreaJet[mjet] = new TH1F(hAreaname,"area dist in eta ",ndiv,etamin,etamax);
614 // background energy and area
615 TH1F* hEtBackg = new TH1F("hEtBackg"," backg et dist in eta ",ndiv,etamin,etamax);
616 TH1F* hAreaBackg = new TH1F("hAreaBackg","backg area dist in eta ",ndiv,etamin,etamax);
619 for(Int_t jpart = 0; jpart < nIn; jpart++){ // loop for all particles in array
620 for(Int_t ijet=0; ijet<nJ; ijet++){ // loop for all jets
621 Float_t deta = etaT[jpart] - etaJet[ijet];
622 Float_t dphi = phiT[jpart] - phiJet[ijet];
623 if (dphi < -TMath::Pi()) dphi= -dphi - 2.0 * TMath::Pi();
624 if (dphi > TMath::Pi()) dphi = 2.0 * TMath::Pi() - dphi;
625 Float_t dr = TMath::Sqrt(deta * deta + dphi * dphi);
626 if(dr <= rc){ // particles inside this cone
629 if((fReader->GetCutFlag(jpart)) == 1){// pt cut
630 hEtJet[ijet]->Fill(etaT[jpart],ptT[jpart]); //particle inside cone
631 if(fReader->GetSignalFlag(jpart) == 1) etsigJet[ijet] += ptT[jpart];
636 if(injet[jpart] == -1 && fReader->GetCutFlag(jpart) == 1)
637 hEtBackg->Fill(etaT[jpart],ptT[jpart]); // particle outside cones
638 } //end particle loop
641 Float_t eta0 = etamin;
642 Float_t etaw = (etamax - etamin)/((Float_t)ndiv);
643 Float_t eta1 = eta0 + etaw;
644 for(Int_t etabin = 0; etabin< ndiv; etabin++){ // loop for all eta bins
645 Float_t etac = eta0 + etaw/2.0;
646 Float_t areabg = etaw*2.0*TMath::Pi();
647 for(Int_t ijet=0; ijet<nJ; ijet++){ // loop for all jets
648 Float_t deta0 = TMath::Abs(eta0 - etaJet[ijet]);
649 Float_t deta1 = TMath::Abs(eta1 - etaJet[ijet]);
650 Float_t acc0 = 0.0; Float_t acc1 = 0.0;
652 if(deta0 > rc && deta1 < rc){
653 acc1 = rc*rc*TMath::ACos(deta1/rc) - deta1*TMath::Sqrt(rc*rc - deta1*deta1);
656 if(deta0 < rc && deta1 > rc){
657 acc0 = rc*rc*TMath::ACos(deta0/rc) - deta0*TMath::Sqrt(rc*rc - deta0*deta0);
660 if(deta0 < rc && deta1 < rc){
661 acc0 = rc*rc*TMath::ACos(deta0/rc) - deta0*TMath::Sqrt(rc*rc - deta0*deta0);
662 acc1 = rc*rc*TMath::ACos(deta1/rc) - deta1*TMath::Sqrt(rc*rc - deta1*deta1);
663 if(eta1<etaJet[ijet]) areaj = acc1-acc0; // case 1
664 if((eta0 < etaJet[ijet]) && (etaJet[ijet]<eta1)) areaj = rc*rc*TMath::Pi() - acc1 -acc0; // case 2
665 if(etaJet[ijet] < eta0) areaj = acc0 -acc1; // case 3
667 hAreaJet[ijet]->Fill(etac,areaj);
668 areabg = areabg - areaj;
670 hAreaBackg->Fill(etac,areabg);
673 } // end loop for all eta bins
675 //subtract background
676 for(Int_t kjet=0; kjet<nJ; kjet++){
677 etJet[kjet] = 0.0; // first clear etJet for this jet
678 for(Int_t bin = 0; bin< ndiv; bin++){
679 if(hAreaJet[kjet]->GetBinContent(bin)){
680 Float_t areab = hAreaBackg->GetBinContent(bin);
681 Float_t etb = hEtBackg->GetBinContent(bin);
682 Float_t areaR = (hAreaJet[kjet]->GetBinContent(bin))/areab;
683 etJet[kjet] = etJet[kjet] + ((hEtJet[kjet]->GetBinContent(bin)) - etb*areaR); //subtraction
688 // calc background total
689 Double_t etOut = hEtBackg->Integral();
690 Double_t areaOut = hAreaBackg->Integral();
691 Float_t areaT = 4*(header->GetLegoEtaMax())*TMath::Pi();
692 etbgTotalN = etOut*areaT/areaOut;
695 for(Int_t ljet=0; ljet<nJ; ljet++){ // loop for all jets
697 delete hAreaJet[ljet];
704 ////////////////////////////////////////////////////////////////////////
707 void AliUA1JetFinderV1::SubtractBackgRatio(Int_t& nIn, Int_t&nJ,Float_t& etbgTotalN,
708 Float_t* ptT, Float_t* etaT, Float_t* phiT,
709 Float_t* etJet,Float_t* etaJet, Float_t* phiJet, Float_t* etsigJet,
710 Int_t* multJet, Int_t* injet)
712 // Ratio background subtraction method taking into acount dEt/deta distribution
713 AliUA1JetHeaderV1* header = (AliUA1JetHeaderV1*) fHeader;
714 //factor F calc before
715 Float_t bgRatioCut = header->GetBackgCutRatio();
719 Float_t rc= header->GetRadius();
720 Float_t etamax = header->GetLegoEtaMax();
721 Float_t etamin = header->GetLegoEtaMin();
724 // jet energy and area arrays
727 for(Int_t mjet=0; mjet<nJ; mjet++){
728 char hEtname[256]; char hAreaname[256];
729 sprintf(hEtname, "hEtJet%d", mjet); sprintf(hAreaname, "hAreaJet%d", mjet);
730 hEtJet[mjet] = new TH1F(hEtname,"et dist in eta ",ndiv,etamin,etamax); // change range
731 hAreaJet[mjet] = new TH1F(hAreaname,"area dist in eta ",ndiv,etamin,etamax); // change range
733 // background energy and area
734 TH1F* hEtBackg = new TH1F("hEtBackg"," backg et dist in eta ",ndiv,etamin,etamax); // change range
735 TH1F* hAreaBackg = new TH1F("hAreaBackg","backg area dist in eta ",ndiv,etamin,etamax); // change range
738 for(Int_t jpart = 0; jpart < nIn; jpart++){ // loop for all particles in array
739 //if((fReader->GetCutFlag(jpart)) != 1) continue;
740 for(Int_t ijet=0; ijet<nJ; ijet++){ // loop for all jets
741 Float_t deta = etaT[jpart] - etaJet[ijet];
742 Float_t dphi = phiT[jpart] - phiJet[ijet];
743 if (dphi < -TMath::Pi()) dphi= -dphi - 2.0 * TMath::Pi();
744 if (dphi > TMath::Pi()) dphi = 2.0 * TMath::Pi() - dphi;
745 Float_t dr = TMath::Sqrt(deta * deta + dphi * dphi);
746 if(dr <= rc){ // particles inside this cone
749 if((fReader->GetCutFlag(jpart)) == 1){ //pt cut
750 hEtJet[ijet]->Fill(etaT[jpart],ptT[jpart]); //particle inside cone and pt cut
751 if(fReader->GetSignalFlag(jpart) == 1) etsigJet[ijet] += ptT[jpart];
756 if(injet[jpart] == -1) hEtBackg->Fill(etaT[jpart],ptT[jpart]); // particle outside cones
757 } //end particle loop
760 Float_t eta0 = etamin;
761 Float_t etaw = (etamax - etamin)/((Float_t)ndiv);
762 Float_t eta1 = eta0 + etaw;
763 for(Int_t etabin = 0; etabin< ndiv; etabin++){ // loop for all eta bins
764 Float_t etac = eta0 + etaw/2.0;
765 Float_t areabg = etaw*2.0*TMath::Pi();
766 for(Int_t ijet=0; ijet<nJ; ijet++){ // loop for all jets
767 Float_t deta0 = TMath::Abs(eta0 - etaJet[ijet]);
768 Float_t deta1 = TMath::Abs(eta1 - etaJet[ijet]);
769 Float_t acc0 = 0.0; Float_t acc1 = 0.0;
771 if(deta0 > rc && deta1 < rc){
772 acc1 = rc*rc*TMath::ACos(deta1/rc) - deta1*TMath::Sqrt(rc*rc - deta1*deta1);
775 if(deta0 < rc && deta1 > rc){
776 acc0 = rc*rc*TMath::ACos(deta0/rc) - deta0*TMath::Sqrt(rc*rc - deta0*deta0);
779 if(deta0 < rc && deta1 < rc){
780 acc0 = rc*rc*TMath::ACos(deta0/rc) - deta0*TMath::Sqrt(rc*rc - deta0*deta0);
781 acc1 = rc*rc*TMath::ACos(deta1/rc) - deta1*TMath::Sqrt(rc*rc - deta1*deta1);
782 if(eta1<etaJet[ijet]) areaj = acc1-acc0; // case 1
783 if((eta0 < etaJet[ijet]) && (etaJet[ijet]<eta1)) areaj = rc*rc*TMath::Pi() - acc1 -acc0; // case 2
784 if(etaJet[ijet] < eta0) areaj = acc0 -acc1; // case 3
786 hAreaJet[ijet]->Fill(etac,areaj);
787 areabg = areabg - areaj;
789 hAreaBackg->Fill(etac,areabg);
792 } // end loop for all eta bins
794 //subtract background
795 for(Int_t kjet=0; kjet<nJ; kjet++){
796 etJet[kjet] = 0.0; // first clear etJet for this jet
797 for(Int_t bin = 0; bin< ndiv; bin++){
798 if(hAreaJet[kjet]->GetBinContent(bin)){
799 Float_t areab = hAreaBackg->GetBinContent(bin);
800 Float_t etb = hEtBackg->GetBinContent(bin);
801 Float_t areaR = (hAreaJet[kjet]->GetBinContent(bin))/areab;
802 etJet[kjet] = etJet[kjet] + ((hEtJet[kjet]->GetBinContent(bin)) - etb*areaR*bgRatioCut); //subtraction
807 // calc background total
808 Double_t etOut = hEtBackg->Integral();
809 Double_t areaOut = hAreaBackg->Integral();
810 Float_t areaT = 4*(header->GetLegoEtaMax())*TMath::Pi();
811 etbgTotalN = etOut*areaT/areaOut;
814 for(Int_t ljet=0; ljet<nJ; ljet++){ // loop for all jets
816 delete hAreaJet[ljet];
823 ////////////////////////////////////////////////////////////////////////
826 void AliUA1JetFinderV1::Reset()
830 AliJetFinder::Reset();
833 ////////////////////////////////////////////////////////////////////////
835 void AliUA1JetFinderV1::WriteJHeaderToFile()
837 AliUA1JetHeaderV1* header = (AliUA1JetHeaderV1*) fHeader;
841 ////////////////////////////////////////////////////////////////////////
843 void AliUA1JetFinderV1::Init()
845 // initializes some variables
846 AliUA1JetHeaderV1* header = (AliUA1JetHeaderV1*) fHeader;
848 TH2F("legoH","eta-phi",
849 header->GetLegoNbinEta(), header->GetLegoEtaMin(),
850 header->GetLegoEtaMax(), header->GetLegoNbinPhi(),
851 header->GetLegoPhiMin(), header->GetLegoPhiMax());
852 // Do not store in current dir
853 fLego->SetDirectory(0);