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 **************************************************************************/
17 //---------------------------------------------------------------------
18 // UA1 Cone Algorithm Jet finder
19 // manages the search for jets
20 // Author: Rafael.Diaz.Valdes@cern.ch
22 //---------------------------------------------------------------------
24 #include <TLorentzVector.h>
29 #include "AliUA1JetFinderV1.h"
30 #include "AliUA1JetHeaderV1.h"
31 #include "AliJetReaderHeader.h"
32 #include "AliJetReader.h"
36 ClassImp(AliUA1JetFinderV1)
38 ////////////////////////////////////////////////////////////////////////
40 AliUA1JetFinderV1::AliUA1JetFinderV1()
48 ////////////////////////////////////////////////////////////////////////
50 AliUA1JetFinderV1::~AliUA1JetFinderV1()
56 ////////////////////////////////////////////////////////////////////////
59 void AliUA1JetFinderV1::FindJets()
62 //1) Fill cell map array
63 //2) calculate total energy and fluctuation level
65 // 3.1) look centroides in cell map
66 // 3.2) calculate total energy in cones
67 // 3.3) flag as a possible jet
68 // 3.4) reorder cones by energy
69 //4) subtract backg in accepted jets
72 // transform input to pt,eta,phi plus lego
73 TClonesArray *lvArray = fReader->GetMomentumArray();
74 Int_t nIn = lvArray->GetEntries();
77 // local arrays for input
78 Float_t* ptT = new Float_t[nIn];
79 Float_t* etaT = new Float_t[nIn];
80 Float_t* phiT = new Float_t[nIn];
81 Int_t* injet = new Int_t[nIn];
83 //total energy in array
84 Float_t etbgTotal = 0.0;
85 TH1F* hPtTotal = new TH1F("hPt","Pt distribution of all particles ",100,0.0,15.0);
87 // load input vectors and calculate total energy in array
88 for (Int_t i = 0; i < nIn; i++){
89 TLorentzVector *lv = (TLorentzVector*) lvArray->At(i);
92 phiT[i] = ((lv->Phi() < 0) ? (lv->Phi()) + 2 * TMath::Pi() : lv->Phi());
93 if (fReader->GetCutFlag(i) != 1) continue;
94 fLego->Fill(etaT[i], phiT[i], ptT[i]);
95 hPtTotal->Fill(ptT[i]);
98 fJets->SetNinput(nIn);
100 // calculate total energy and fluctuation in map
101 Double_t meanpt = hPtTotal->GetMean();
102 Double_t ptRMS = hPtTotal->GetRMS();
103 Double_t npart = hPtTotal->GetEntries();
104 Double_t dEtTotal = (TMath::Sqrt(npart))*TMath::Sqrt(meanpt * meanpt + ptRMS*ptRMS);
106 // arrays to hold jets
107 Float_t* etaJet = new Float_t[30];
108 Float_t* phiJet = new Float_t[30];
109 Float_t* etJet = new Float_t[30];
110 Float_t* etsigJet = new Float_t[30]; //signal et in jet
111 Float_t* etallJet = new Float_t[30]; // total et in jet (tmp variable)
112 Int_t* ncellsJet = new Int_t[30];
113 Int_t* multJet = new Int_t[30];
114 Int_t nJets; // to hold number of jets found by algorithm
115 Int_t nj; // number of jets accepted
116 Float_t prec = fHeader->GetPrecBg();
118 while(bgprec > prec){
119 //reset jet arrays in memory
120 memset(etaJet,0,sizeof(Float_t)*30);
121 memset(phiJet,0,sizeof(Float_t)*30);
122 memset(etJet,0,sizeof(Float_t)*30);
123 memset(etallJet,0,sizeof(Float_t)*30);
124 memset(etsigJet,0,sizeof(Float_t)*30);
125 memset(ncellsJet,0,sizeof(Int_t)*30);
126 memset(multJet,0,sizeof(Int_t)*30);
129 // reset particles-jet array in memory
130 memset(injet,-1,sizeof(Int_t)*nIn);
131 //run cone algorithm finder
132 RunAlgoritm(etbgTotal,dEtTotal,nJets,etJet,etaJet,phiJet,etallJet,ncellsJet);
133 //run background subtraction
134 if(nJets > fHeader->GetNAcceptJets()) // limited number of accepted jets per event
135 nj = fHeader->GetNAcceptJets();
138 //subtract background
139 Float_t etbgTotalN = 0.0; //new background
140 if(fHeader->GetBackgMode() == 1) // standar
141 SubtractBackg(nIn,nj,etbgTotalN,ptT,etaT,phiT,etJet,etaJet,phiJet,etsigJet,multJet,injet);
142 if(fHeader->GetBackgMode() == 2) //cone
143 SubtractBackgCone(nIn,nj,etbgTotalN,ptT,etaT,phiT,etJet,etaJet,phiJet,etsigJet,multJet,injet);
144 if(fHeader->GetBackgMode() == 3) //ratio
145 SubtractBackgRatio(nIn,nj,etbgTotalN,ptT,etaT,phiT,etJet,etaJet,phiJet,etsigJet,multJet,injet);
146 if(fHeader->GetBackgMode() == 4) //statistic
147 SubtractBackgStat(nIn,nj,etbgTotalN,ptT,etaT,phiT,etJet,etaJet,phiJet,etsigJet,multJet,injet);
149 if(etbgTotalN != 0.0)
150 bgprec = (etbgTotal - etbgTotalN)/etbgTotalN;
153 etbgTotal = etbgTotalN; // update with new background estimation
157 Int_t* idxjets = new Int_t[nj];
159 for(Int_t kj=0; kj<nj; kj++){
160 if ((etaJet[kj] > (fHeader->GetJetEtaMax())) ||
161 (etaJet[kj] < (fHeader->GetJetEtaMin())) ||
162 (etJet[kj] < fHeader->GetMinJetEt())) continue; // acceptance eta range and etmin
163 Float_t px, py,pz,en; // convert to 4-vector
164 px = etJet[kj] * TMath::Cos(phiJet[kj]);
165 py = etJet[kj] * TMath::Sin(phiJet[kj]);
166 pz = etJet[kj] / TMath::Tan(2.0 * TMath::ATan(TMath::Exp(-etaJet[kj])));
167 en = TMath::Sqrt(px * px + py * py + pz * pz);
168 fJets->AddJet(px, py, pz, en);
169 idxjets[nselectj] = kj;
172 //add signal percentage and total signal in AliJets for analysis tool
173 Float_t* percentage = new Float_t[nselectj];
174 Int_t* ncells = new Int_t[nselectj];
175 Int_t* mult = new Int_t[nselectj];
176 for(Int_t i = 0; i< nselectj; i++){
177 percentage[i] = etsigJet[idxjets[i]]/etJet[idxjets[i]];
178 ncells[i] = ncellsJet[idxjets[i]];
179 mult[i] = multJet[idxjets[i]];
181 //add particle-injet relationship ///
182 for(Int_t bj = 0; bj < nIn; bj++){
183 if(injet[bj] == -1) continue; //background particle
185 for(Int_t ci = 0; ci< nselectj; ci++){
186 if(injet[bj] == idxjets[ci]){
192 if(bflag == 0) injet[bj] = -1; // set as background particle
194 fJets->SetNCells(ncells);
195 fJets->SetPtFromSignal(percentage);
196 fJets->SetMultiplicities(mult);
197 fJets->SetInJet(injet);
198 fJets->SetEtaIn(etaT);
199 fJets->SetPhiIn(phiT);
201 fJets->SetEtAvg(etbgTotal/(4*(fHeader->GetLegoEtaMax())*TMath::Pi()));
225 ////////////////////////////////////////////////////////////////////////
227 void AliUA1JetFinderV1::RunAlgoritm(Float_t etbgTotal, Double_t dEtTotal, Int_t& nJets,
228 Float_t* etJet,Float_t* etaJet, Float_t* phiJet,
229 Float_t* etallJet, Int_t* ncellsJet)
233 // check enough space! *to be done*
234 Float_t etCell[60000]; //! Cell Energy
235 Float_t etaCell[60000]; //! Cell eta
236 Float_t phiCell[60000]; //! Cell phi
237 Int_t flagCell[60000]; //! Cell flag
240 TAxis* xaxis = fLego->GetXaxis();
241 TAxis* yaxis = fLego->GetYaxis();
243 for (Int_t i = 1; i <= fHeader->GetLegoNbinEta(); i++) {
244 for (Int_t j = 1; j <= fHeader->GetLegoNbinPhi(); j++) {
245 e = fLego->GetBinContent(i,j);
246 if (e < 0.0) continue; // don't include this cells
247 Float_t eta = xaxis->GetBinCenter(i);
248 Float_t phi = yaxis->GetBinCenter(j);
250 etaCell[nCell] = eta;
251 phiCell[nCell] = phi;
252 flagCell[nCell] = 0; //default
257 // Parameters from header
258 Float_t minmove = fHeader->GetMinMove();
259 Float_t maxmove = fHeader->GetMaxMove();
260 Float_t rc = fHeader->GetRadius();
261 Float_t etseed = fHeader->GetEtSeed();
262 //Float_t etmin = fHeader->GetMinJetEt();
266 // tmp array of jets form algoritm
267 Float_t etaAlgoJet[30];
268 Float_t phiAlgoJet[30];
269 Float_t etAlgoJet[30];
270 Int_t ncellsAlgoJet[30];
275 Int_t * index = new Int_t[nCell];
276 TMath::Sort(nCell, etCell, index);
277 // variable used in centroide loop
295 for(Int_t icell = 0; icell < nCell; icell++){
296 Int_t jcell = index[icell];
297 if(etCell[jcell] <= etseed) continue; // if cell energy is low et seed
298 if(flagCell[jcell] != 0) continue; // if cell was used before
299 eta = etaCell[jcell];
300 phi = phiCell[jcell];
311 for(Int_t kcell =0; kcell < nCell; kcell++){
312 Int_t lcell = index[kcell];
313 if(lcell == jcell) continue; // cell itself
314 if(flagCell[lcell] != 0) continue; // cell used before
315 if(etCell[lcell] > etCell[jcell]) continue;
317 deta = etaCell[lcell] - eta;
318 dphi = phiCell[lcell] - phi;
319 if (dphi < -TMath::Pi()) dphi= -dphi - 2.0 * TMath::Pi();
320 if (dphi > TMath::Pi()) dphi = 2.0 * TMath::Pi() - dphi;
321 dr = TMath::Sqrt(deta * deta + dphi * dphi);
323 // calculate offset from initiate cell
324 deta = etaCell[lcell] - eta0;
325 dphi = phiCell[lcell] - phi0;
326 if (dphi < -TMath::Pi()) dphi= -dphi - 2.0 * TMath::Pi();
327 if (dphi > TMath::Pi()) dphi = 2.0 * TMath::Pi() - dphi;
328 etas = etas + etCell[lcell]*deta;
329 phis = phis + etCell[lcell]*dphi;
330 ets = ets + etCell[lcell];
331 //new weighted eta and phi including this cell
332 eta = eta0 + etas/ets;
333 phi = phi0 + phis/ets;
334 // if cone does not move much, just go to next step
335 dr = TMath::Sqrt((eta-etab)*(eta-etab) + (phi-phib)*(phi-phib));
336 if(dr <= minmove) break;
337 // cone should not move more than max_mov
338 dr = TMath::Sqrt((etas/ets)*(etas/ets) + (phis/ets)*(phis/ets));
345 }else{ // store this loop information
353 }//end of cells loop looking centroide
355 //avoid cones overloap (to be implemented in the future)
357 //flag cells in Rc, estimate total energy in cone
358 Float_t etCone = 0.0;
360 rc = fHeader->GetRadius();
361 for(Int_t ncell =0; ncell < nCell; ncell++){
362 if(flagCell[ncell] != 0) continue; // cell used before
364 deta = etaCell[ncell] - eta;
365 dphi = phiCell[ncell] - phi;
366 if (dphi < -TMath::Pi()) dphi= -dphi - 2.0 * TMath::Pi();
367 if (dphi > TMath::Pi()) dphi = 2.0 * TMath::Pi() - dphi;
368 dr = TMath::Sqrt(deta * deta + dphi * dphi);
369 if(dr <= rc){ // cell in cone
370 flagCell[ncell] = -1;
371 etCone+=etCell[ncell];
376 // select jets with et > background
377 // estimate max fluctuation of background in cone
378 Double_t ncellin = (Double_t)nCellIn;
379 Double_t ntcell = (Double_t)nCell;
380 Double_t etbmax = (etbgTotal + dEtTotal )*(ncellin/ntcell);
382 Double_t etcmin = etCone ; // could be used etCone - etmin !!
383 //desicions !! etbmax < etcmin
384 for(Int_t mcell =0; mcell < nCell; mcell++){
385 if(flagCell[mcell] == -1){
387 flagCell[mcell] = 1; //flag cell as used
389 flagCell[mcell] = 0; // leave it free
392 //store tmp jet info !!!
393 if(etbmax < etcmin) {
394 etaAlgoJet[nJets] = eta;
395 phiAlgoJet[nJets] = phi;
396 etAlgoJet[nJets] = etCone;
397 ncellsAlgoJet[nJets] = nCellIn;
401 } // end of cells loop
403 //reorder jets by et in cone
404 //sort jets by energy
405 Int_t * idx = new Int_t[nJets];
406 TMath::Sort(nJets, etAlgoJet, idx);
407 for(Int_t p = 0; p < nJets; p++){
408 etaJet[p] = etaAlgoJet[idx[p]];
409 phiJet[p] = phiAlgoJet[idx[p]];
410 etJet[p] = etAlgoJet[idx[p]];
411 etallJet[p] = etAlgoJet[idx[p]];
412 ncellsJet[p] = ncellsAlgoJet[idx[p]];
421 ////////////////////////////////////////////////////////////////////////
423 void AliUA1JetFinderV1::SubtractBackg(Int_t& nIn, Int_t&nJ, Float_t&etbgTotalN,
424 Float_t* ptT, Float_t* etaT, Float_t* phiT,
425 Float_t* etJet,Float_t* etaJet, Float_t* phiJet, Float_t* etsigJet,
426 Int_t* multJet, Int_t* injet)
428 //background subtraction using cone method but without correction in dE/deta distribution
430 //calculate energy inside and outside cones
431 Float_t rc= fHeader->GetRadius();
434 for(Int_t jpart = 0; jpart < nIn; jpart++){ // loop for all particles in array
435 // if((fReader->GetCutFlag(jpart)) != 1) continue; // pt cut
436 for(Int_t ijet=0; ijet<nJ; ijet++){
437 Float_t deta = etaT[jpart] - etaJet[ijet];
438 Float_t dphi = phiT[jpart] - phiJet[ijet];
439 if (dphi < -TMath::Pi()) dphi= -dphi - 2.0 * TMath::Pi();
440 if (dphi > TMath::Pi()) dphi = 2.0 * TMath::Pi() - dphi;
441 Float_t dr = TMath::Sqrt(deta * deta + dphi * dphi);
442 if(dr <= rc){ // particles inside this cone
445 if((fReader->GetCutFlag(jpart)) == 1){ // pt cut
446 etIn[ijet] += ptT[jpart];
447 if(fReader->GetSignalFlag(jpart) == 1) etsigJet[ijet]+= ptT[jpart];
452 if(injet[jpart] == -1 && fReader->GetSignalFlag(jpart) == 1)
453 etOut += ptT[jpart]; // particle outside cones and pt cut
454 } //end particle loop
456 //estimate jets and background areas
458 Float_t areaOut = 4*(fHeader->GetLegoEtaMax())*TMath::Pi();
459 for(Int_t k=0; k<nJ; k++){
460 Float_t detamax = etaJet[k] + rc;
461 Float_t detamin = etaJet[k] - rc;
462 Float_t accmax = 0.0; Float_t accmin = 0.0;
463 if(detamax > fHeader->GetLegoEtaMax()){ // sector outside etamax
464 Float_t h = fHeader->GetLegoEtaMax() - etaJet[k];
465 accmax = rc*rc*TMath::ACos(h/rc) - h*TMath::Sqrt(rc*rc - h*h);
467 if(detamin < fHeader->GetLegoEtaMin()){ // sector outside etamin
468 Float_t h = fHeader->GetLegoEtaMax() + etaJet[k];
469 accmin = rc*rc*TMath::ACos(h/rc) - h*TMath::Sqrt(rc*rc - h*h);
471 areaJet[k] = rc*rc*TMath::Pi() - accmax - accmin;
472 areaOut = areaOut - areaJet[k];
474 //subtract background using area method
475 for(Int_t ljet=0; ljet<nJ; ljet++){
476 Float_t areaRatio = areaJet[ljet]/areaOut;
477 etJet[ljet] = etIn[ljet]-etOut*areaRatio; // subtraction
480 // estimate new total background
481 Float_t areaT = 4*(fHeader->GetLegoEtaMax())*TMath::Pi();
482 etbgTotalN = etOut*areaT/areaOut;
487 ////////////////////////////////////////////////////////////////////////
489 void AliUA1JetFinderV1::SubtractBackgStat(Int_t& nIn, Int_t&nJ,Float_t&etbgTotalN,
490 Float_t* ptT, Float_t* etaT, Float_t* phiT,
491 Float_t* etJet,Float_t* etaJet, Float_t* phiJet, Float_t* etsigJet,
492 Int_t* multJet, Int_t* injet)
495 //background subtraction using statistical method
497 Float_t etbgStat = fHeader->GetBackgStat(); // pre-calculated background
499 //calculate energy inside
500 Float_t rc= fHeader->GetRadius();
503 for(Int_t jpart = 0; jpart < nIn; jpart++){ // loop for all particles in array
504 //if((fReader->GetCutFlag(jpart)) != 1) continue; // pt cut
505 for(Int_t ijet=0; ijet<nJ; ijet++){
506 Float_t deta = etaT[jpart] - etaJet[ijet];
507 Float_t dphi = phiT[jpart] - phiJet[ijet];
508 if (dphi < -TMath::Pi()) dphi= -dphi - 2.0 * TMath::Pi();
509 if (dphi > TMath::Pi()) dphi = 2.0 * TMath::Pi() - dphi;
510 Float_t dr = TMath::Sqrt(deta * deta + dphi * dphi);
511 if(dr <= rc){ // particles inside this cone
514 if((fReader->GetCutFlag(jpart)) == 1){ // pt cut
515 etIn[ijet]+= ptT[jpart];
516 if(fReader->GetSignalFlag(jpart) == 1) etsigJet[ijet] += ptT[jpart];
521 } //end particle loop
525 Float_t areaOut = 4*(fHeader->GetLegoEtaMax())*TMath::Pi();
526 for(Int_t k=0; k<nJ; k++){
527 Float_t detamax = etaJet[k] + rc;
528 Float_t detamin = etaJet[k] - rc;
529 Float_t accmax = 0.0; Float_t accmin = 0.0;
530 if(detamax > fHeader->GetLegoEtaMax()){ // sector outside etamax
531 Float_t h = fHeader->GetLegoEtaMax() - etaJet[k];
532 accmax = rc*rc*TMath::ACos(h/rc) - h*TMath::Sqrt(rc*rc - h*h);
534 if(detamin < fHeader->GetLegoEtaMin()){ // sector outside etamin
535 Float_t h = fHeader->GetLegoEtaMax() + etaJet[k];
536 accmin = rc*rc*TMath::ACos(h/rc) - h*TMath::Sqrt(rc*rc - h*h);
538 areaJet[k] = rc*rc*TMath::Pi() - accmax - accmin;
541 //subtract background using area method
542 for(Int_t ljet=0; ljet<nJ; ljet++){
543 Float_t areaRatio = areaJet[ljet]/areaOut;
544 etJet[ljet] = etIn[ljet]-etbgStat*areaRatio; // subtraction
547 etbgTotalN = etbgStat;
551 ////////////////////////////////////////////////////////////////////////
553 void AliUA1JetFinderV1::SubtractBackgCone(Int_t& nIn, Int_t&nJ,Float_t& etbgTotalN,
554 Float_t* ptT, Float_t* etaT, Float_t* phiT,
555 Float_t* etJet,Float_t* etaJet, Float_t* phiJet, Float_t* etsigJet,
556 Int_t* multJet, Int_t* injet)
558 // Cone background subtraction method taking into acount dEt/deta distribution
561 Float_t rc= fHeader->GetRadius();
562 Float_t etamax = fHeader->GetLegoEtaMax();
563 Float_t etamin = fHeader->GetLegoEtaMin();
566 // jet energy and area arrays
569 for(Int_t mjet=0; mjet<nJ; mjet++){
570 char hEtname[256]; char hAreaname[256];
571 sprintf(hEtname, "hEtJet%d", mjet); sprintf(hAreaname, "hAreaJet%d", mjet);
572 hEtJet[mjet] = new TH1F(hEtname,"et dist in eta ",ndiv,etamin,etamax);
573 hAreaJet[mjet] = new TH1F(hAreaname,"area dist in eta ",ndiv,etamin,etamax);
575 // background energy and area
576 TH1F* hEtBackg = new TH1F("hEtBackg"," backg et dist in eta ",ndiv,etamin,etamax);
577 TH1F* hAreaBackg = new TH1F("hAreaBackg","backg area dist in eta ",ndiv,etamin,etamax);
580 for(Int_t jpart = 0; jpart < nIn; jpart++){ // loop for all particles in array
581 for(Int_t ijet=0; ijet<nJ; ijet++){ // loop for all jets
582 Float_t deta = etaT[jpart] - etaJet[ijet];
583 Float_t dphi = phiT[jpart] - phiJet[ijet];
584 if (dphi < -TMath::Pi()) dphi= -dphi - 2.0 * TMath::Pi();
585 if (dphi > TMath::Pi()) dphi = 2.0 * TMath::Pi() - dphi;
586 Float_t dr = TMath::Sqrt(deta * deta + dphi * dphi);
587 if(dr <= rc){ // particles inside this cone
590 if((fReader->GetCutFlag(jpart)) == 1){// pt cut
591 hEtJet[ijet]->Fill(etaT[jpart],ptT[jpart]); //particle inside cone
592 if(fReader->GetSignalFlag(jpart) == 1) etsigJet[ijet] += ptT[jpart];
597 if(injet[jpart] == -1 && fReader->GetSignalFlag(jpart) == 1)
598 hEtBackg->Fill(etaT[jpart],ptT[jpart]); // particle outside cones
599 } //end particle loop
602 Float_t eta0 = etamin;
603 Float_t etaw = (etamax - etamin)/((Float_t)ndiv);
604 Float_t eta1 = eta0 + etaw;
605 for(Int_t etabin = 0; etabin< ndiv; etabin++){ // loop for all eta bins
606 Float_t etac = eta0 + etaw/2.0;
607 Float_t areabg = etaw*2.0*TMath::Pi();
608 for(Int_t ijet=0; ijet<nJ; ijet++){ // loop for all jets
609 Float_t deta0 = TMath::Abs(eta0 - etaJet[ijet]);
610 Float_t deta1 = TMath::Abs(eta1 - etaJet[ijet]);
611 Float_t acc0 = 0.0; Float_t acc1 = 0.0;
613 if(deta0 > rc && deta1 < rc){
614 acc1 = rc*rc*TMath::ACos(deta1/rc) - deta1*TMath::Sqrt(rc*rc - deta1*deta1);
617 if(deta0 < rc && deta1 > rc){
618 acc0 = rc*rc*TMath::ACos(deta0/rc) - deta0*TMath::Sqrt(rc*rc - deta0*deta0);
621 if(deta0 < rc && deta1 < rc){
622 acc0 = rc*rc*TMath::ACos(deta0/rc) - deta0*TMath::Sqrt(rc*rc - deta0*deta0);
623 acc1 = rc*rc*TMath::ACos(deta1/rc) - deta1*TMath::Sqrt(rc*rc - deta1*deta1);
624 if(eta1<etaJet[ijet]) areaj = acc1-acc0; // case 1
625 if((eta0 < etaJet[ijet]) && (etaJet[ijet]<eta1)) areaj = rc*rc*TMath::Pi() - acc1 -acc0; // case 2
626 if(etaJet[ijet] < eta0) areaj = acc0 -acc1; // case 3
628 hAreaJet[ijet]->Fill(etac,areaj);
629 areabg = areabg - areaj;
631 hAreaBackg->Fill(etac,areabg);
634 } // end loop for all eta bins
636 //subtract background
637 for(Int_t kjet=0; kjet<nJ; kjet++){
638 etJet[kjet] = 0.0; // first clear etJet for this jet
639 for(Int_t bin = 0; bin< ndiv; bin++){
640 if(hAreaJet[kjet]->GetBinContent(bin)){
641 Float_t areab = hAreaBackg->GetBinContent(bin);
642 Float_t etb = hEtBackg->GetBinContent(bin);
643 Float_t areaR = (hAreaJet[kjet]->GetBinContent(bin))/areab;
644 etJet[kjet] = etJet[kjet] + ((hEtJet[kjet]->GetBinContent(bin)) - etb*areaR); //subtraction
649 // calc background total
650 Double_t etOut = hEtBackg->Integral();
651 Double_t areaOut = hAreaBackg->Integral();
652 Float_t areaT = 4*(fHeader->GetLegoEtaMax())*TMath::Pi();
653 etbgTotalN = etOut*areaT/areaOut;
656 for(Int_t ljet=0; ljet<nJ; ljet++){ // loop for all jets
658 delete hAreaJet[ljet];
665 ////////////////////////////////////////////////////////////////////////
668 void AliUA1JetFinderV1::SubtractBackgRatio(Int_t& nIn, Int_t&nJ,Float_t& etbgTotalN,
669 Float_t* ptT, Float_t* etaT, Float_t* phiT,
670 Float_t* etJet,Float_t* etaJet, Float_t* phiJet, Float_t* etsigJet,
671 Int_t* multJet, Int_t* injet)
673 // Ratio background subtraction method taking into acount dEt/deta distribution
675 //factor F calc before
676 Float_t bgRatioCut = fHeader->GetBackgCutRatio();
680 Float_t rc= fHeader->GetRadius();
681 Float_t etamax = fHeader->GetLegoEtaMax();
682 Float_t etamin = fHeader->GetLegoEtaMin();
685 // jet energy and area arrays
688 for(Int_t mjet=0; mjet<nJ; mjet++){
689 char hEtname[256]; char hAreaname[256];
690 sprintf(hEtname, "hEtJet%d", mjet); sprintf(hAreaname, "hAreaJet%d", mjet);
691 hEtJet[mjet] = new TH1F(hEtname,"et dist in eta ",ndiv,etamin,etamax); // change range
692 hAreaJet[mjet] = new TH1F(hAreaname,"area dist in eta ",ndiv,etamin,etamax); // change range
694 // background energy and area
695 TH1F* hEtBackg = new TH1F("hEtBackg"," backg et dist in eta ",ndiv,etamin,etamax); // change range
696 TH1F* hAreaBackg = new TH1F("hAreaBackg","backg area dist in eta ",ndiv,etamin,etamax); // change range
699 for(Int_t jpart = 0; jpart < nIn; jpart++){ // loop for all particles in array
700 //if((fReader->GetCutFlag(jpart)) != 1) continue;
701 for(Int_t ijet=0; ijet<nJ; ijet++){ // loop for all jets
702 Float_t deta = etaT[jpart] - etaJet[ijet];
703 Float_t dphi = phiT[jpart] - phiJet[ijet];
704 if (dphi < -TMath::Pi()) dphi= -dphi - 2.0 * TMath::Pi();
705 if (dphi > TMath::Pi()) dphi = 2.0 * TMath::Pi() - dphi;
706 Float_t dr = TMath::Sqrt(deta * deta + dphi * dphi);
707 if(dr <= rc){ // particles inside this cone
710 if((fReader->GetCutFlag(jpart)) == 1){ //pt cut
711 hEtJet[ijet]->Fill(etaT[jpart],ptT[jpart]); //particle inside cone and pt cut
712 if(fReader->GetSignalFlag(jpart) == 1) etsigJet[ijet] += ptT[jpart];
717 if(injet[jpart] == -1) hEtBackg->Fill(etaT[jpart],ptT[jpart]); // particle outside cones
718 } //end particle loop
721 Float_t eta0 = etamin;
722 Float_t etaw = (etamax - etamin)/((Float_t)ndiv);
723 Float_t eta1 = eta0 + etaw;
724 for(Int_t etabin = 0; etabin< ndiv; etabin++){ // loop for all eta bins
725 Float_t etac = eta0 + etaw/2.0;
726 Float_t areabg = etaw*2.0*TMath::Pi();
727 for(Int_t ijet=0; ijet<nJ; ijet++){ // loop for all jets
728 Float_t deta0 = TMath::Abs(eta0 - etaJet[ijet]);
729 Float_t deta1 = TMath::Abs(eta1 - etaJet[ijet]);
730 Float_t acc0 = 0.0; Float_t acc1 = 0.0;
732 if(deta0 > rc && deta1 < rc){
733 acc1 = rc*rc*TMath::ACos(deta1/rc) - deta1*TMath::Sqrt(rc*rc - deta1*deta1);
736 if(deta0 < rc && deta1 > rc){
737 acc0 = rc*rc*TMath::ACos(deta0/rc) - deta0*TMath::Sqrt(rc*rc - deta0*deta0);
740 if(deta0 < rc && deta1 < rc){
741 acc0 = rc*rc*TMath::ACos(deta0/rc) - deta0*TMath::Sqrt(rc*rc - deta0*deta0);
742 acc1 = rc*rc*TMath::ACos(deta1/rc) - deta1*TMath::Sqrt(rc*rc - deta1*deta1);
743 if(eta1<etaJet[ijet]) areaj = acc1-acc0; // case 1
744 if((eta0 < etaJet[ijet]) && (etaJet[ijet]<eta1)) areaj = rc*rc*TMath::Pi() - acc1 -acc0; // case 2
745 if(etaJet[ijet] < eta0) areaj = acc0 -acc1; // case 3
747 hAreaJet[ijet]->Fill(etac,areaj);
748 areabg = areabg - areaj;
750 hAreaBackg->Fill(etac,areabg);
753 } // end loop for all eta bins
755 //subtract background
756 for(Int_t kjet=0; kjet<nJ; kjet++){
757 etJet[kjet] = 0.0; // first clear etJet for this jet
758 for(Int_t bin = 0; bin< ndiv; bin++){
759 if(hAreaJet[kjet]->GetBinContent(bin)){
760 Float_t areab = hAreaBackg->GetBinContent(bin);
761 Float_t etb = hEtBackg->GetBinContent(bin);
762 Float_t areaR = (hAreaJet[kjet]->GetBinContent(bin))/areab;
763 etJet[kjet] = etJet[kjet] + ((hEtJet[kjet]->GetBinContent(bin)) - etb*areaR*bgRatioCut); //subtraction
768 // calc background total
769 Double_t etOut = hEtBackg->Integral();
770 Double_t areaOut = hAreaBackg->Integral();
771 Float_t areaT = 4*(fHeader->GetLegoEtaMax())*TMath::Pi();
772 etbgTotalN = etOut*areaT/areaOut;
775 for(Int_t ljet=0; ljet<nJ; ljet++){ // loop for all jets
777 delete hAreaJet[ljet];
784 ////////////////////////////////////////////////////////////////////////
787 void AliUA1JetFinderV1::Reset()
793 ////////////////////////////////////////////////////////////////////////
795 void AliUA1JetFinderV1::WriteJHeaderToFile()
801 ////////////////////////////////////////////////////////////////////////
803 void AliUA1JetFinderV1::Init()
805 // initializes some variables
809 TH2F("legoH","eta-phi",
810 fHeader->GetLegoNbinEta(), fHeader->GetLegoEtaMin(),
811 fHeader->GetLegoEtaMax(), fHeader->GetLegoNbinPhi(),
812 fHeader->GetLegoPhiMin(), fHeader->GetLegoPhiMax());