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ee7de0dd 1/**************************************************************************
2 * Copyright(c) 1998-1999, ALICE Experiment at CERN, All rights reserved. *
3 * *
4 * Author: The ALICE Off-line Project. *
5 * Contributors are mentioned in the code where appropriate. *
6 * *
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 **************************************************************************/
15
16/* $Id$ */
17
18//---------------------------------------------------------------------
19// UA1 Cone Algorithm Jet finder
20// manages the search for jets
21// Author: Rafael.Diaz.Valdes@cern.ch
22// (version in c++)
23// Modified to include neutral particles (magali.estienne@ires.in2p3.fr)
24//---------------------------------------------------------------------
25
26#include <Riostream.h>
27
28#include <TArrayF.h>
29#include <TClonesArray.h>
30#include <TFile.h>
31#include <TH1F.h>
32#include <TH2F.h>
33#include <TLorentzVector.h>
34#include <TMath.h>
35#include <TRefArray.h>
36
37#include "AliUA1JetFinderV2.h"
38#include "AliUA1JetHeaderV1.h"
39#include "AliJetUnitArray.h"
40#include "AliJetReaderHeader.h"
41#include "AliJetReader.h"
42#include "AliJet.h"
43#include "AliAODJet.h"
44
45
46ClassImp(AliUA1JetFinderV2)
47
48////////////////////////////////////////////////////////////////////////
49
50 AliUA1JetFinderV2::AliUA1JetFinderV2():
51 fDebug(0),
52 fOpt(0)
53{
54 // Constructor
55 fHeader = 0x0;
56 fLego = 0x0;
57}
58
59////////////////////////////////////////////////////////////////////////
60
61AliUA1JetFinderV2::~AliUA1JetFinderV2()
62
63{
64 // destructor
65}
66
67////////////////////////////////////////////////////////////////////////
68
69
70void AliUA1JetFinderV2::FindJets()
71
72{
73 //1) Fill cell map array
74 //2) calculate total energy and fluctuation level
75 //3) Run algorithm
76 // 3.1) look centroides in cell map
77 // 3.2) calculate total energy in cones
78 // 3.3) flag as a possible jet
79 // 3.4) reorder cones by energy
80 //4) subtract backg in accepted jets
81 //5) fill AliJet list
82
83 // transform input to pt,eta,phi plus lego
84
85 AliUA1JetHeaderV1* header = (AliUA1JetHeaderV1*) fHeader;
86 TClonesArray* fUnit = fReader->GetUnitArray();
87 Int_t nCandidate = fReader->GetNumCandidate();
88 Int_t nIn = fUnit->GetEntries();
89
90 if (nIn == 0) return;
91
92 // local arrays for input No Cuts
93 // Both pt < ptMin and pt > ptMin
94 Float_t* enT = new Float_t[nCandidate];
95 Float_t* ptT = new Float_t[nCandidate];
96 Float_t* etaT = new Float_t[nCandidate];
97 Float_t* phiT = new Float_t[nCandidate];
98 Float_t* detaT = new Float_t[nCandidate];
99 Float_t* dphiT = new Float_t[nCandidate];
100 Float_t* cFlagT = new Float_t[nCandidate];
101 Float_t* cClusterT = new Float_t[nCandidate];
102 Float_t* idT = new Float_t[nCandidate];
103 Int_t loop1 = 0;
104 Int_t* injet = new Int_t[nCandidate];
105 Int_t* sflag = new Int_t[nCandidate];
106
107
108 //total energy in array
109 Float_t etbgTotal = 0.0;
110 TH1F* hPtTotal = new TH1F("hPt","Pt distribution of all particles ",100,0.0,15.0);
111
112 // Input cell info
113 Float_t *etCell = new Float_t[nIn]; //! Cell Energy - Extracted from UnitArray
114 Float_t *etaCell = new Float_t[nIn]; //! Cell eta - Extracted from UnitArray
115 Float_t *phiCell = new Float_t[nIn]; //! Cell phi - Extracted from UnitArray
116 Int_t *flagCell = new Int_t[nIn]; //! Cell phi - Extracted from UnitArray
117
118 // Information extracted from fUnitArray
119 // load input vectors and calculate total energy in array
120 for(Int_t i=0; i<nIn; i++)
121 {
122 AliJetUnitArray *uArray = (AliJetUnitArray*)fUnit->At(i);
123 if(uArray->GetUnitCutFlag()==1){
124 etCell[i] = uArray->GetUnitEnergy();
125 if (etCell[i] > 0.0) etCell[i] -= header->GetMinCellEt();
126 if (etCell[i] < 0.0) etCell[i] = 0.;
127 etaCell[i] = uArray->GetUnitEta();
128 phiCell[i] = uArray->GetUnitPhi();
129 flagCell[i] = 0; // default
130 }
131 else {
132 etCell[i] = 0.;
133 etaCell[i] = uArray->GetUnitEta();
134 phiCell[i] = uArray->GetUnitPhi();
135 flagCell[i] = 0;
136 }
137
138 if(uArray->GetUnitEnergy()>0.){
139 ptT[loop1] = uArray->GetUnitEnergy();
140 enT[loop1] = uArray->GetUnitEnergy();
141 etaT[loop1] = uArray->GetUnitEta();
142 phiT[loop1] = uArray->GetUnitPhi();
143 detaT[loop1] = uArray->GetUnitDeta();
144 dphiT[loop1] = uArray->GetUnitDphi();
145 cFlagT[loop1]= uArray->GetUnitCutFlag();
146 idT[loop1] = uArray->GetUnitID();
147 if(cFlagT[loop1] == 1) {
148 hPtTotal->Fill(ptT[loop1]);
149 // fLego->Fill(etaT[i], phiT[i], ptT[i]);
150 etbgTotal+= ptT[loop1];
151 }
152 loop1++;
153 }
154 }
155
156 // fJets->SetNinput(nIn);
157 fJets->SetNinput(nCandidate);
158
159 // calculate total energy and fluctuation in map
160 Double_t meanpt = hPtTotal->GetMean();
161 Double_t ptRMS = hPtTotal->GetRMS();
162 Double_t npart = hPtTotal->GetEntries();
163 Double_t dEtTotal = (TMath::Sqrt(npart))*TMath::Sqrt(meanpt * meanpt + ptRMS*ptRMS);
164
165 // arrays to hold jets
166 Float_t* etaJet = new Float_t[30];
167 Float_t* phiJet = new Float_t[30];
168 Float_t* etJet = new Float_t[30];
169 Float_t* etsigJet = new Float_t[30]; //signal et in jet
170 Float_t* etallJet = new Float_t[30]; // total et in jet (tmp variable)
171 Int_t* ncellsJet = new Int_t[30];
172 Int_t* multJet = new Int_t[30];
173 Int_t nJets; // to hold number of jets found by algorithm
174 Int_t nj; // number of jets accepted
175 Float_t prec = header->GetPrecBg();
176 Float_t bgprec = 1;
177 while(bgprec > prec){
178 //reset jet arrays in memory
179 memset(etaJet,0,sizeof(Float_t)*30);
180 memset(phiJet,0,sizeof(Float_t)*30);
181 memset(etJet,0,sizeof(Float_t)*30);
182 memset(etallJet,0,sizeof(Float_t)*30);
183 memset(etsigJet,0,sizeof(Float_t)*30);
184 memset(ncellsJet,0,sizeof(Int_t)*30);
185 memset(multJet,0,sizeof(Int_t)*30);
186 nJets = 0;
187 nj = 0;
188 // reset particles-jet array in memory
189 memset(injet,-1,sizeof(Int_t)*nCandidate);
190 //run cone algorithm finder
191 RunAlgoritm(nIn,etCell,etaCell,phiCell,flagCell,etbgTotal,dEtTotal,nJets,etJet,etaJet,phiJet,etallJet,ncellsJet);
192 //run background subtraction
193 if(nJets > header->GetNAcceptJets()) // limited number of accepted jets per event
194 nj = header->GetNAcceptJets();
195 else
196 nj = nJets;
197 //subtract background
198 Float_t etbgTotalN = 0.0; //new background
199 if(header->GetBackgMode() == 1) // standar
200 SubtractBackg(nCandidate,nj,etbgTotalN,ptT,etaT,phiT,etJet,etaJet,phiJet,etsigJet,multJet,injet);
201 if(header->GetBackgMode() == 2) //cone
202 SubtractBackgCone(nCandidate,nj,etbgTotalN,ptT,etaT,phiT,etJet,etaJet,phiJet,etsigJet,multJet,injet);
203 if(header->GetBackgMode() == 3) //ratio
204 SubtractBackgRatio(nCandidate,nj,etbgTotalN,ptT,etaT,phiT,etJet,etaJet,phiJet,etsigJet,multJet,injet);
205 if(header->GetBackgMode() == 4) //statistic
206 SubtractBackgStat(nCandidate,nj,etbgTotalN,ptT,etaT,phiT,etJet,etaJet,phiJet,etsigJet,multJet,injet);
207 //calc precision
208 if(etbgTotalN != 0.0)
209 bgprec = (etbgTotal - etbgTotalN)/etbgTotalN;
210 else
211 bgprec = 0;
212 etbgTotal = etbgTotalN; // update with new background estimation
213 } //end while
214
215 // add jets to list
216 Int_t* idxjets = new Int_t[nj];
217 Int_t nselectj = 0;
218 printf("Found %d jets \n", nj);
219
220 for(Int_t kj=0; kj<nj; kj++){
221 if ((etaJet[kj] > (header->GetJetEtaMax())) ||
222 (etaJet[kj] < (header->GetJetEtaMin())) ||
223 (etJet[kj] < header->GetMinJetEt())) continue; // acceptance eta range and etmin
224 Float_t px, py,pz,en; // convert to 4-vector
225 px = etJet[kj] * TMath::Cos(phiJet[kj]);
226 py = etJet[kj] * TMath::Sin(phiJet[kj]);
227 pz = etJet[kj] / TMath::Tan(2.0 * TMath::ATan(TMath::Exp(-etaJet[kj])));
228 en = TMath::Sqrt(px * px + py * py + pz * pz);
229 fJets->AddJet(px, py, pz, en);
230 AliAODJet jet(px, py, pz, en);
231 jet.Print("");
232
233 AddJet(jet);
234
235 idxjets[nselectj] = kj;
236 nselectj++;
237 }
238 //add signal percentage and total signal in AliJets for analysis tool
239 Float_t* percentage = new Float_t[nselectj];
240 Int_t* ncells = new Int_t[nselectj];
241 Int_t* mult = new Int_t[nselectj];
242 for(Int_t i = 0; i< nselectj; i++){
243 percentage[i] = etsigJet[idxjets[i]]/etJet[idxjets[i]];
244 ncells[i] = ncellsJet[idxjets[i]];
245 mult[i] = multJet[idxjets[i]];
246 }
247 //add particle-injet relationship ///
248 // for(Int_t bj = 0; bj < nIn; bj++){
249 for(Int_t bj = 0; bj < nCandidate; bj++){
250 if(injet[bj] == -1) continue; //background particle
251 Int_t bflag = 0;
252 for(Int_t ci = 0; ci< nselectj; ci++){
253 if(injet[bj] == idxjets[ci]){
254 injet[bj]= ci;
255 bflag++;
256 break;
257 }
258 }
259 if(bflag == 0) injet[bj] = -1; // set as background particle
260 }
261 fJets->SetNCells(ncells);
262 fJets->SetPtFromSignal(percentage);
263 fJets->SetMultiplicities(mult);
264 fJets->SetInJet(injet);
265 fJets->SetEtaIn(etaT);
266 fJets->SetPhiIn(phiT);
267 fJets->SetPtIn(ptT);
268 fJets->SetEtAvg(etbgTotal/(4*(header->GetLegoEtaMax())*TMath::Pi()));
269
270
271 //delete
272 delete enT;
273 delete ptT;
274 delete etaT;
275 delete phiT;
276 delete detaT;
277 delete dphiT;
278 delete cFlagT;
279 delete cClusterT;
280 delete idT;
281 delete injet;
282 delete sflag;
283 delete hPtTotal;
284 delete etCell;
285 delete etaCell;
286 delete phiCell;
287 delete flagCell;
288 delete etaJet;
289 delete phiJet;
290 delete etJet;
291 delete etsigJet;
292 delete etallJet;
293 delete ncellsJet;
294 delete multJet;
295 delete idxjets;
296 delete percentage;
297 delete ncells;
298 delete mult;
299
300
301}
302
303////////////////////////////////////////////////////////////////////////
304
305void AliUA1JetFinderV2::RunAlgoritm(Int_t nIn, Float_t* etCell, Float_t* etaCell, Float_t* phiCell,
306 Int_t* flagCell, Float_t etbgTotal, Double_t dEtTotal,
307 Int_t& nJets, Float_t* etJet,Float_t* etaJet, Float_t* phiJet,
308 Float_t* etallJet, Int_t* ncellsJet)
309{
310
311 Int_t nCell = nIn;
312
313 AliUA1JetHeaderV1* header = (AliUA1JetHeaderV1*) fHeader;
314
315 // Parameters from header
316 Float_t minmove = header->GetMinMove();
317 Float_t maxmove = header->GetMaxMove();
318 Float_t rc = header->GetRadius();
319 Float_t etseed = header->GetEtSeed();
320
321 // tmp array of jets form algoritm
322 Float_t etaAlgoJet[30];
323 Float_t phiAlgoJet[30];
324 Float_t etAlgoJet[30];
325 Int_t ncellsAlgoJet[30];
326
327 //run algorithm//
328
329 // sort cells by et
330 Int_t * index = new Int_t[nCell];
331 TMath::Sort(nCell, etCell, index);
332
333 // variable used in centroide loop
9dda5307 334 Float_t eta = 0.0;
335 Float_t phi = 0.0;
336 Float_t eta0 = 0.0;
337 Float_t phi0 = 0.0;
338 Float_t etab = 0.0;
339 Float_t phib = 0.0;
340 Float_t etas = 0.0;
341 Float_t phis = 0.0;
342 Float_t ets = 0.0;
343 Float_t deta = 0.0;
344 Float_t dphi = 0.0;
345 Float_t dr = 0.0;
346 Float_t etsb = 0.0;
ee7de0dd 347 Float_t etasb = 0.0;
348 Float_t phisb = 0.0;
9dda5307 349 Float_t dphib = 0.0;
ee7de0dd 350
351
352 for(Int_t icell = 0; icell < nCell; icell++){
9dda5307 353 Int_t jcell = index[icell];
354 if(etCell[jcell] <= etseed) continue; // if cell energy is low et seed
355 if(flagCell[jcell] != 0) continue; // if cell was used before
356 eta = etaCell[jcell];
357 phi = phiCell[jcell];
358 eta0 = eta;
359 phi0 = phi;
360 etab = eta;
361 phib = phi;
362 ets = etCell[jcell];
363 etas = 0.0;
364 phis = 0.0;
365 etsb = ets;
366 etasb = 0.0;
367 phisb = 0.0;
368 for(Int_t kcell =0; kcell < nCell; kcell++){
369 Int_t lcell = index[kcell];
370 if(lcell == jcell) continue; // cell itself
371 if(flagCell[lcell] != 0) continue; // cell used before
372 if(etCell[lcell] > etCell[jcell]) continue;
373 //calculate dr
374 deta = etaCell[lcell] - eta;
375 dphi = phiCell[lcell] - phi;
376 if (dphi < -TMath::Pi()) dphi= -dphi - 2.0 * TMath::Pi();
377 if (dphi > TMath::Pi()) dphi = 2.0 * TMath::Pi() - dphi;
378 dr = TMath::Sqrt(deta * deta + dphi * dphi);
379 if(dr <= rc){
380 // calculate offset from initiate cell
381 deta = etaCell[lcell] - eta0;
382 dphi = phiCell[lcell] - phi0;
383 if (dphi < -TMath::Pi()) dphi = dphi + 2.0 * TMath::Pi();
384 if (dphi > TMath::Pi()) dphi = dphi - 2.0 * TMath::Pi();
385 etas = etas + etCell[lcell]*deta;
386 phis = phis + etCell[lcell]*dphi;
387 ets = ets + etCell[lcell];
ee7de0dd 388 //new weighted eta and phi including this cell
389 eta = eta0 + etas/ets;
390 phi = phi0 + phis/ets;
391 // if cone does not move much, just go to next step
9dda5307 392 dphib = TMath::Abs(phi - phib);
393 if (dphib > TMath::Pi()) dphib = 2. * TMath::Pi() - dphib;
394 dr = TMath::Sqrt((eta-etab)*(eta-etab) + dphib * dphib);
ee7de0dd 395 if(dr <= minmove) break;
396 // cone should not move more than max_mov
397 dr = TMath::Sqrt((etas/ets)*(etas/ets) + (phis/ets)*(phis/ets));
398 if(dr > maxmove){
399 eta = etab;
400 phi = phib;
401 ets = etsb;
402 etas = etasb;
403 phis = phisb;
404 }else{ // store this loop information
405 etab=eta;
406 phib=phi;
407 etsb = ets;
408 etasb = etas;
409 phisb = phis;
410 }
411 }
412 }//end of cells loop looking centroide
413
414 //avoid cones overloap (to be implemented in the future)
415
416 //flag cells in Rc, estimate total energy in cone
417 Float_t etCone = 0.0;
418 Int_t nCellIn = 0;
419 rc = header->GetRadius();
420 for(Int_t ncell =0; ncell < nCell; ncell++){
421 if(flagCell[ncell] != 0) continue; // cell used before
422 //calculate dr
423 deta = etaCell[ncell] - eta;
424 dphi = phiCell[ncell] - phi;
425 if (dphi < -TMath::Pi()) dphi= -dphi - 2.0 * TMath::Pi();
426 if (dphi > TMath::Pi()) dphi = 2.0 * TMath::Pi() - dphi;
427 dr = TMath::Sqrt(deta * deta + dphi * dphi);
428 if(dr <= rc){ // cell in cone
429 flagCell[ncell] = -1;
430 etCone+=etCell[ncell];
431 nCellIn++;
432 }
433 }
434
435 // select jets with et > background
436 // estimate max fluctuation of background in cone
437 Double_t ncellin = (Double_t)nCellIn;
438 Double_t ntcell = (Double_t)nCell;
439 Double_t etbmax = (etbgTotal + dEtTotal )*(ncellin/ntcell);
440 // min cone et
441 Double_t etcmin = etCone ; // could be used etCone - etmin !!
442 //desicions !! etbmax < etcmin
443 for(Int_t mcell =0; mcell < nCell; mcell++){
444 if(flagCell[mcell] == -1){
445 if(etbmax < etcmin)
446 flagCell[mcell] = 1; //flag cell as used
447 else
448 flagCell[mcell] = 0; // leave it free
449 }
450 }
451 //store tmp jet info !!!
452 if(etbmax < etcmin) {
453 etaAlgoJet[nJets] = eta;
454 phiAlgoJet[nJets] = phi;
455 etAlgoJet[nJets] = etCone;
456 ncellsAlgoJet[nJets] = nCellIn;
457 nJets++;
458 }
459
460 } // end of cells loop
461
462 //reorder jets by et in cone
463 //sort jets by energy
464 Int_t * idx = new Int_t[nJets];
465 TMath::Sort(nJets, etAlgoJet, idx);
466 for(Int_t p = 0; p < nJets; p++){
467 etaJet[p] = etaAlgoJet[idx[p]];
468 phiJet[p] = phiAlgoJet[idx[p]];
469 etJet[p] = etAlgoJet[idx[p]];
470 etallJet[p] = etAlgoJet[idx[p]];
471 ncellsJet[p] = ncellsAlgoJet[idx[p]];
472 }
473
474
475 //delete
476 delete index;
477 delete idx;
478
479}
480////////////////////////////////////////////////////////////////////////
481
482void AliUA1JetFinderV2::SubtractBackg(Int_t& nIn, Int_t&nJ, Float_t&etbgTotalN,
483 Float_t* ptT, Float_t* etaT, Float_t* phiT,
484 Float_t* etJet,Float_t* etaJet, Float_t* phiJet, Float_t* etsigJet,
485 Int_t* multJet, Int_t* injet)
486{
487 //background subtraction using cone method but without correction in dE/deta distribution
488
489 //calculate energy inside and outside cones
490 AliUA1JetHeaderV1* header = (AliUA1JetHeaderV1*) fHeader;
491 Float_t rc= header->GetRadius();
492 Float_t etIn[30];
493 Float_t etOut = 0;
494 for(Int_t jpart = 0; jpart < nIn; jpart++){ // loop for all particles in array
495 // if((fReader->GetCutFlag(jpart)) != 1) continue; // pt cut
496 for(Int_t ijet=0; ijet<nJ; ijet++){
497 Float_t deta = etaT[jpart] - etaJet[ijet];
498 Float_t dphi = phiT[jpart] - phiJet[ijet];
499 if (dphi < -TMath::Pi()) dphi= -dphi - 2.0 * TMath::Pi();
500 if (dphi > TMath::Pi()) dphi = 2.0 * TMath::Pi() - dphi;
501 Float_t dr = TMath::Sqrt(deta * deta + dphi * dphi);
502 if(dr <= rc){ // particles inside this cone
503 multJet[ijet]++;
504 injet[jpart] = ijet;
505 if((fReader->GetCutFlag(jpart)) == 1){ // pt cut
506 etIn[ijet] += ptT[jpart];
507 if(fReader->GetSignalFlag(jpart) == 1) etsigJet[ijet]+= ptT[jpart];
508 }
509 break;
510 }
511 }// end jets loop
512 if(injet[jpart] == -1 && fReader->GetCutFlag(jpart) == 1)
513 etOut += ptT[jpart]; // particle outside cones and pt cut
514 } //end particle loop
515
516 //estimate jets and background areas
517 Float_t areaJet[30];
518 Float_t areaOut = 4*(header->GetLegoEtaMax())*TMath::Pi();
519 for(Int_t k=0; k<nJ; k++){
520 Float_t detamax = etaJet[k] + rc;
521 Float_t detamin = etaJet[k] - rc;
522 Float_t accmax = 0.0; Float_t accmin = 0.0;
523 if(detamax > header->GetLegoEtaMax()){ // sector outside etamax
524 Float_t h = header->GetLegoEtaMax() - etaJet[k];
525 accmax = rc*rc*TMath::ACos(h/rc) - h*TMath::Sqrt(rc*rc - h*h);
526 }
527 if(detamin < header->GetLegoEtaMin()){ // sector outside etamin
528 Float_t h = header->GetLegoEtaMax() + etaJet[k];
529 accmin = rc*rc*TMath::ACos(h/rc) - h*TMath::Sqrt(rc*rc - h*h);
530 }
531 areaJet[k] = rc*rc*TMath::Pi() - accmax - accmin;
532 areaOut = areaOut - areaJet[k];
533 }
534 //subtract background using area method
535 for(Int_t ljet=0; ljet<nJ; ljet++){
536 Float_t areaRatio = areaJet[ljet]/areaOut;
537 etJet[ljet] = etIn[ljet]-etOut*areaRatio; // subtraction
538 }
539
540 // estimate new total background
541 Float_t areaT = 4*(header->GetLegoEtaMax())*TMath::Pi();
542 etbgTotalN = etOut*areaT/areaOut;
543
544
545}
546
547////////////////////////////////////////////////////////////////////////
548
549void AliUA1JetFinderV2::SubtractBackgStat(Int_t& nIn, Int_t&nJ,Float_t&etbgTotalN,
550 Float_t* ptT, Float_t* etaT, Float_t* phiT,
551 Float_t* etJet,Float_t* etaJet, Float_t* phiJet, Float_t* etsigJet,
552 Int_t* multJet, Int_t* injet)
553{
554
555 //background subtraction using statistical method
556 AliUA1JetHeaderV1* header = (AliUA1JetHeaderV1*) fHeader;
557 Float_t etbgStat = header->GetBackgStat(); // pre-calculated background
558
559 //calculate energy inside
560 Float_t rc= header->GetRadius();
561 Float_t etIn[30];
562
563 for(Int_t jpart = 0; jpart < nIn; jpart++){ // loop for all particles in array
564 //if((fReader->GetCutFlag(jpart)) != 1) continue; // pt cut
565 for(Int_t ijet=0; ijet<nJ; ijet++){
566 Float_t deta = etaT[jpart] - etaJet[ijet];
567 Float_t dphi = phiT[jpart] - phiJet[ijet];
568 if (dphi < -TMath::Pi()) dphi= -dphi - 2.0 * TMath::Pi();
569 if (dphi > TMath::Pi()) dphi = 2.0 * TMath::Pi() - dphi;
570 Float_t dr = TMath::Sqrt(deta * deta + dphi * dphi);
571 if(dr <= rc){ // particles inside this cone
572 multJet[ijet]++;
573 injet[jpart] = ijet;
574 if((fReader->GetCutFlag(jpart)) == 1){ // pt cut
575 etIn[ijet]+= ptT[jpart];
576 if(fReader->GetSignalFlag(jpart) == 1) etsigJet[ijet] += ptT[jpart];
577 }
578 break;
579 }
580 }// end jets loop
581 } //end particle loop
582
583 //calc jets areas
584 Float_t areaJet[30];
585 Float_t areaOut = 4*(header->GetLegoEtaMax())*TMath::Pi();
586 for(Int_t k=0; k<nJ; k++){
587 Float_t detamax = etaJet[k] + rc;
588 Float_t detamin = etaJet[k] - rc;
589 Float_t accmax = 0.0; Float_t accmin = 0.0;
590 if(detamax > header->GetLegoEtaMax()){ // sector outside etamax
591 Float_t h = header->GetLegoEtaMax() - etaJet[k];
592 accmax = rc*rc*TMath::ACos(h/rc) - h*TMath::Sqrt(rc*rc - h*h);
593 }
594 if(detamin < header->GetLegoEtaMin()){ // sector outside etamin
595 Float_t h = header->GetLegoEtaMax() + etaJet[k];
596 accmin = rc*rc*TMath::ACos(h/rc) - h*TMath::Sqrt(rc*rc - h*h);
597 }
598 areaJet[k] = rc*rc*TMath::Pi() - accmax - accmin;
599 }
600
601 //subtract background using area method
602 for(Int_t ljet=0; ljet<nJ; ljet++){
603 Float_t areaRatio = areaJet[ljet]/areaOut;
604 etJet[ljet] = etIn[ljet]-etbgStat*areaRatio; // subtraction
605 }
606
607 etbgTotalN = etbgStat;
608
609}
610
611////////////////////////////////////////////////////////////////////////
612
613void AliUA1JetFinderV2::SubtractBackgCone(Int_t& nIn, Int_t&nJ,Float_t& etbgTotalN,
614 Float_t* ptT, Float_t* etaT, Float_t* phiT,
615 Float_t* etJet,Float_t* etaJet, Float_t* phiJet, Float_t* etsigJet,
616 Int_t* multJet, Int_t* injet)
617{
618 // Cone background subtraction method taking into acount dEt/deta distribution
619 AliUA1JetHeaderV1* header = (AliUA1JetHeaderV1*) fHeader;
620 //general
621 Float_t rc= header->GetRadius();
622 Float_t etamax = header->GetLegoEtaMax();
623 Float_t etamin = header->GetLegoEtaMin();
624 Int_t ndiv = 100;
625
626 // jet energy and area arrays
627 TH1F* hEtJet[30];
628 TH1F* hAreaJet[30];
629 for(Int_t mjet=0; mjet<nJ; mjet++){
630 char hEtname[256]; char hAreaname[256];
631 sprintf(hEtname, "hEtJet%d", mjet); sprintf(hAreaname, "hAreaJet%d", mjet);
632 hEtJet[mjet] = new TH1F(hEtname,"et dist in eta ",ndiv,etamin,etamax);
633 hAreaJet[mjet] = new TH1F(hAreaname,"area dist in eta ",ndiv,etamin,etamax);
634 }
635 // background energy and area
636 TH1F* hEtBackg = new TH1F("hEtBackg"," backg et dist in eta ",ndiv,etamin,etamax);
637 TH1F* hAreaBackg = new TH1F("hAreaBackg","backg area dist in eta ",ndiv,etamin,etamax);
638
639 //fill energies
640 for(Int_t jpart = 0; jpart < nIn; jpart++){ // loop for all particles in array
641 for(Int_t ijet=0; ijet<nJ; ijet++){ // loop for all jets
642 Float_t deta = etaT[jpart] - etaJet[ijet];
643 Float_t dphi = phiT[jpart] - phiJet[ijet];
644 if (dphi < -TMath::Pi()) dphi= -dphi - 2.0 * TMath::Pi();
645 if (dphi > TMath::Pi()) dphi = 2.0 * TMath::Pi() - dphi;
646 Float_t dr = TMath::Sqrt(deta * deta + dphi * dphi);
647 if(dr <= rc){ // particles inside this cone
648 injet[jpart] = ijet;
649 multJet[ijet]++;
650 if((fReader->GetCutFlag(jpart)) == 1){// pt cut
651 hEtJet[ijet]->Fill(etaT[jpart],ptT[jpart]); //particle inside cone
652 if(fReader->GetSignalFlag(jpart) == 1) etsigJet[ijet] += ptT[jpart];
653 }
654 break;
655 }
656 }// end jets loop
657 if(injet[jpart] == -1 && fReader->GetCutFlag(jpart) == 1)
658 hEtBackg->Fill(etaT[jpart],ptT[jpart]); // particle outside cones
659 } //end particle loop
660
661 //calc areas
662 Float_t eta0 = etamin;
663 Float_t etaw = (etamax - etamin)/((Float_t)ndiv);
664 Float_t eta1 = eta0 + etaw;
665 for(Int_t etabin = 0; etabin< ndiv; etabin++){ // loop for all eta bins
666 Float_t etac = eta0 + etaw/2.0;
667 Float_t areabg = etaw*2.0*TMath::Pi();
668 for(Int_t ijet=0; ijet<nJ; ijet++){ // loop for all jets
669 Float_t deta0 = TMath::Abs(eta0 - etaJet[ijet]);
670 Float_t deta1 = TMath::Abs(eta1 - etaJet[ijet]);
671 Float_t acc0 = 0.0; Float_t acc1 = 0.0;
672 Float_t areaj = 0.0;
673 if(deta0 > rc && deta1 < rc){
674 acc1 = rc*rc*TMath::ACos(deta1/rc) - deta1*TMath::Sqrt(rc*rc - deta1*deta1);
675 areaj = acc1;
676 }
677 if(deta0 < rc && deta1 > rc){
678 acc0 = rc*rc*TMath::ACos(deta0/rc) - deta0*TMath::Sqrt(rc*rc - deta0*deta0);
679 areaj = acc0;
680 }
681 if(deta0 < rc && deta1 < rc){
682 acc0 = rc*rc*TMath::ACos(deta0/rc) - deta0*TMath::Sqrt(rc*rc - deta0*deta0);
683 acc1 = rc*rc*TMath::ACos(deta1/rc) - deta1*TMath::Sqrt(rc*rc - deta1*deta1);
684 if(eta1<etaJet[ijet]) areaj = acc1-acc0; // case 1
685 if((eta0 < etaJet[ijet]) && (etaJet[ijet]<eta1)) areaj = rc*rc*TMath::Pi() - acc1 -acc0; // case 2
686 if(etaJet[ijet] < eta0) areaj = acc0 -acc1; // case 3
687 }
688 hAreaJet[ijet]->Fill(etac,areaj);
689 areabg = areabg - areaj;
690 } // end jets loop
691 hAreaBackg->Fill(etac,areabg);
692 eta0 = eta1;
693 eta1 = eta1 + etaw;
694 } // end loop for all eta bins
695
696 //subtract background
697 for(Int_t kjet=0; kjet<nJ; kjet++){
698 etJet[kjet] = 0.0; // first clear etJet for this jet
699 for(Int_t bin = 0; bin< ndiv; bin++){
700 if(hAreaJet[kjet]->GetBinContent(bin)){
701 Float_t areab = hAreaBackg->GetBinContent(bin);
702 Float_t etb = hEtBackg->GetBinContent(bin);
703 Float_t areaR = (hAreaJet[kjet]->GetBinContent(bin))/areab;
704 etJet[kjet] = etJet[kjet] + ((hEtJet[kjet]->GetBinContent(bin)) - etb*areaR); //subtraction
705 }
706 }
707 }
708
709 // calc background total
710 Double_t etOut = hEtBackg->Integral();
711 Double_t areaOut = hAreaBackg->Integral();
712 Float_t areaT = 4*(header->GetLegoEtaMax())*TMath::Pi();
713 etbgTotalN = etOut*areaT/areaOut;
714
715 //delete
716 for(Int_t ljet=0; ljet<nJ; ljet++){ // loop for all jets
717 delete hEtJet[ljet];
718 delete hAreaJet[ljet];
719 }
720
721 delete hEtBackg;
722 delete hAreaBackg;
723}
724
725////////////////////////////////////////////////////////////////////////
726
727
728void AliUA1JetFinderV2::SubtractBackgRatio(Int_t& nIn, Int_t&nJ,Float_t& etbgTotalN,
729 Float_t* ptT, Float_t* etaT, Float_t* phiT,
730 Float_t* etJet,Float_t* etaJet, Float_t* phiJet, Float_t* etsigJet,
731 Int_t* multJet, Int_t* injet)
732{
733 // Ratio background subtraction method taking into acount dEt/deta distribution
734 AliUA1JetHeaderV1* header = (AliUA1JetHeaderV1*) fHeader;
735 //factor F calc before
736 Float_t bgRatioCut = header->GetBackgCutRatio();
737
738
739 //general
740 Float_t rc= header->GetRadius();
741 Float_t etamax = header->GetLegoEtaMax();
742 Float_t etamin = header->GetLegoEtaMin();
743 Int_t ndiv = 100;
744
745 // jet energy and area arrays
746 TH1F* hEtJet[30];
747 TH1F* hAreaJet[30];
748 for(Int_t mjet=0; mjet<nJ; mjet++){
749 char hEtname[256]; char hAreaname[256];
750 sprintf(hEtname, "hEtJet%d", mjet); sprintf(hAreaname, "hAreaJet%d", mjet);
751 hEtJet[mjet] = new TH1F(hEtname,"et dist in eta ",ndiv,etamin,etamax); // change range
752 hAreaJet[mjet] = new TH1F(hAreaname,"area dist in eta ",ndiv,etamin,etamax); // change range
753 }
754 // background energy and area
755 TH1F* hEtBackg = new TH1F("hEtBackg"," backg et dist in eta ",ndiv,etamin,etamax); // change range
756 TH1F* hAreaBackg = new TH1F("hAreaBackg","backg area dist in eta ",ndiv,etamin,etamax); // change range
757
758 //fill energies
759 for(Int_t jpart = 0; jpart < nIn; jpart++){ // loop for all particles in array
760 //if((fReader->GetCutFlag(jpart)) != 1) continue;
761 for(Int_t ijet=0; ijet<nJ; ijet++){ // loop for all jets
762 Float_t deta = etaT[jpart] - etaJet[ijet];
763 Float_t dphi = phiT[jpart] - phiJet[ijet];
764 if (dphi < -TMath::Pi()) dphi= -dphi - 2.0 * TMath::Pi();
765 if (dphi > TMath::Pi()) dphi = 2.0 * TMath::Pi() - dphi;
766 Float_t dr = TMath::Sqrt(deta * deta + dphi * dphi);
767 if(dr <= rc){ // particles inside this cone
768 multJet[ijet]++;
769 injet[jpart] = ijet;
770 if((fReader->GetCutFlag(jpart)) == 1){ //pt cut
771 hEtJet[ijet]->Fill(etaT[jpart],ptT[jpart]); //particle inside cone and pt cut
772 if(fReader->GetSignalFlag(jpart) == 1) etsigJet[ijet] += ptT[jpart];
773 }
774 break;
775 }
776 }// end jets loop
777 if(injet[jpart] == -1) hEtBackg->Fill(etaT[jpart],ptT[jpart]); // particle outside cones
778 } //end particle loop
779
780 //calc areas
781 Float_t eta0 = etamin;
782 Float_t etaw = (etamax - etamin)/((Float_t)ndiv);
783 Float_t eta1 = eta0 + etaw;
784 for(Int_t etabin = 0; etabin< ndiv; etabin++){ // loop for all eta bins
785 Float_t etac = eta0 + etaw/2.0;
786 Float_t areabg = etaw*2.0*TMath::Pi();
787 for(Int_t ijet=0; ijet<nJ; ijet++){ // loop for all jets
788 Float_t deta0 = TMath::Abs(eta0 - etaJet[ijet]);
789 Float_t deta1 = TMath::Abs(eta1 - etaJet[ijet]);
790 Float_t acc0 = 0.0; Float_t acc1 = 0.0;
791 Float_t areaj = 0.0;
792 if(deta0 > rc && deta1 < rc){
793 acc1 = rc*rc*TMath::ACos(deta1/rc) - deta1*TMath::Sqrt(rc*rc - deta1*deta1);
794 areaj = acc1;
795 }
796 if(deta0 < rc && deta1 > rc){
797 acc0 = rc*rc*TMath::ACos(deta0/rc) - deta0*TMath::Sqrt(rc*rc - deta0*deta0);
798 areaj = acc0;
799 }
800 if(deta0 < rc && deta1 < rc){
801 acc0 = rc*rc*TMath::ACos(deta0/rc) - deta0*TMath::Sqrt(rc*rc - deta0*deta0);
802 acc1 = rc*rc*TMath::ACos(deta1/rc) - deta1*TMath::Sqrt(rc*rc - deta1*deta1);
803 if(eta1<etaJet[ijet]) areaj = acc1-acc0; // case 1
804 if((eta0 < etaJet[ijet]) && (etaJet[ijet]<eta1)) areaj = rc*rc*TMath::Pi() - acc1 -acc0; // case 2
805 if(etaJet[ijet] < eta0) areaj = acc0 -acc1; // case 3
806 }
807 hAreaJet[ijet]->Fill(etac,areaj);
808 areabg = areabg - areaj;
809 } // end jets loop
810 hAreaBackg->Fill(etac,areabg);
811 eta0 = eta1;
812 eta1 = eta1 + etaw;
813 } // end loop for all eta bins
814
815 //subtract background
816 for(Int_t kjet=0; kjet<nJ; kjet++){
817 etJet[kjet] = 0.0; // first clear etJet for this jet
818 for(Int_t bin = 0; bin< ndiv; bin++){
819 if(hAreaJet[kjet]->GetBinContent(bin)){
820 Float_t areab = hAreaBackg->GetBinContent(bin);
821 Float_t etb = hEtBackg->GetBinContent(bin);
822 Float_t areaR = (hAreaJet[kjet]->GetBinContent(bin))/areab;
823 etJet[kjet] = etJet[kjet] + ((hEtJet[kjet]->GetBinContent(bin)) - etb*areaR*bgRatioCut); //subtraction
824 }
825 }
826 }
827
828 // calc background total
829 Double_t etOut = hEtBackg->Integral();
830 Double_t areaOut = hAreaBackg->Integral();
831 Float_t areaT = 4*(header->GetLegoEtaMax())*TMath::Pi();
832 etbgTotalN = etOut*areaT/areaOut;
833
834 //delete
835 for(Int_t ljet=0; ljet<nJ; ljet++){ // loop for all jets
836 delete hEtJet[ljet];
837 delete hAreaJet[ljet];
838 }
839
840 delete hEtBackg;
841 delete hAreaBackg;
842}
843
844////////////////////////////////////////////////////////////////////////
845
846
847void AliUA1JetFinderV2::Reset()
848{
849 fLego->Reset();
850 fJets->ClearJets();
851 AliJetFinder::Reset();
852}
853
854////////////////////////////////////////////////////////////////////////
855
856void AliUA1JetFinderV2::WriteJHeaderToFile()
857{
858 AliUA1JetHeaderV1* header = (AliUA1JetHeaderV1*) fHeader;
859 header->Write();
860}
861
862////////////////////////////////////////////////////////////////////////
863
864void AliUA1JetFinderV2::Init()
865{
866 // initializes some variables
867 AliUA1JetHeaderV1* header = (AliUA1JetHeaderV1*) fHeader;
868 // book lego
869 fLego = new
870 TH2F("legoH","eta-phi",
871 header->GetLegoNbinEta(), header->GetLegoEtaMin(),
872 header->GetLegoEtaMax(), header->GetLegoNbinPhi(),
873 header->GetLegoPhiMin(), header->GetLegoPhiMax());
874
875 fDebug = fReader->GetReaderHeader()->GetDebug();
876 fOpt = fReader->GetReaderHeader()->GetDetector();
877
878 if(fOpt>0)
879 fReader->CreateTasks();
880
881}