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70e58892 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 **************************************************************************/
98e98c1c 15
7ca4655f 16/* $Id$ */
70e58892 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//---------------------------------------------------------------------
24
7ca4655f 25#include <TArrayF.h>
26#include <TClonesArray.h>
70e58892 27#include <TFile.h>
28#include <TH1F.h>
29#include <TH2F.h>
7ca4655f 30#include <TLorentzVector.h>
31
70e58892 32#include "AliUA1JetFinderV1.h"
33#include "AliUA1JetHeaderV1.h"
34#include "AliJetReaderHeader.h"
35#include "AliJetReader.h"
952b368c 36#include "AliJetHeader.h"
37
38
1d27ecd2 39#include "AliAODJet.h"
d9eba389 40#include "AliLog.h"
70e58892 41
42
43ClassImp(AliUA1JetFinderV1)
44
9e4cc50d 45/////////////////////////////////////////////////////////////////////
1b7d5d7e 46
9e4cc50d 47AliUA1JetFinderV1::AliUA1JetFinderV1() :
48 AliJetFinder(),
5e380e7e 49 fLego(0),
50 fhEtBackg(0),
51 fhAreaBackg(0)
98e98c1c 52{
53 // Constructor
5e380e7e 54 for(int i = 0;i < kMaxJets;i++){
55 fhAreaJet[i] = fhEtJet[i] = 0;
56 }
70e58892 57}
58
59////////////////////////////////////////////////////////////////////////
60
61AliUA1JetFinderV1::~AliUA1JetFinderV1()
62
63{
64 // destructor
c1f55a27 65 delete fLego;
66 fLego = 0;
5e380e7e 67 if(fhEtBackg)delete fhEtBackg;
68 fhEtBackg = 0;
69 if( fhAreaBackg) delete fhAreaBackg;
70 fhAreaBackg = 0;
71 for(int i = 0;i < kMaxJets;i++){
72 if(fhAreaJet[i])delete fhAreaJet[i];
73 if(fhEtJet[i]) delete fhEtJet[i];
74 fhAreaJet[i] = fhEtJet[i] = 0;
75 }
76
70e58892 77}
78
79////////////////////////////////////////////////////////////////////////
80
81
82void AliUA1JetFinderV1::FindJets()
83
84{
85 //1) Fill cell map array
86 //2) calculate total energy and fluctuation level
87 //3) Run algorithm
88 // 3.1) look centroides in cell map
89 // 3.2) calculate total energy in cones
90 // 3.3) flag as a possible jet
91 // 3.4) reorder cones by energy
92 //4) subtract backg in accepted jets
93 //5) fill AliJet list
94
95 // transform input to pt,eta,phi plus lego
7d0f353c 96
97 AliUA1JetHeaderV1* header = (AliUA1JetHeaderV1*) fHeader;
70e58892 98 TClonesArray *lvArray = fReader->GetMomentumArray();
99 Int_t nIn = lvArray->GetEntries();
225f0094 100 if (nIn <= 0) return;
70e58892 101
102 // local arrays for input
5e380e7e 103 // ToDo: check memory fragmentation, maybe better to
104 // define them globally and resize as needed
105 // Fragementation should be worse for low mult...
1d27ecd2 106 Float_t* ptT = new Float_t[nIn];
107 Float_t* etaT = new Float_t[nIn];
108 Float_t* phiT = new Float_t[nIn];
70e58892 109 Int_t* injet = new Int_t[nIn];
110
225f0094 111 memset(ptT,0,sizeof(Float_t)*nIn);
112 memset(etaT,0,sizeof(Float_t)*nIn);
113 memset(phiT,0,sizeof(Float_t)*nIn);
5e380e7e 114
115
116 // load input vectors and calculate total energy in array
117
70e58892 118 //total energy in array
119 Float_t etbgTotal = 0.0;
5e380e7e 120 Float_t npart = 0;
121 Float_t etbg2 = 0;
70e58892 122
70e58892 123 for (Int_t i = 0; i < nIn; i++){
124 TLorentzVector *lv = (TLorentzVector*) lvArray->At(i);
125 ptT[i] = lv->Pt();
126 etaT[i] = lv->Eta();
127 phiT[i] = ((lv->Phi() < 0) ? (lv->Phi()) + 2 * TMath::Pi() : lv->Phi());
128 if (fReader->GetCutFlag(i) != 1) continue;
9dda5307 129 fLego ->Fill(etaT[i], phiT[i], ptT[i]);
5e380e7e 130 npart += 1;
70e58892 131 etbgTotal+= ptT[i];
5e380e7e 132 etbg2 += ptT[i]*ptT[i];
70e58892 133 }
9dda5307 134
70e58892 135 // calculate total energy and fluctuation in map
5e380e7e 136 Double_t meanpt = 0;
137 Double_t ptRMS = 0;
138 if(npart>0){
139 meanpt = etbgTotal/npart;
140 etbg2 = etbg2/npart;
141 if(etbg2>(meanpt*meanpt)){// prenent NAN, should only happen due to numerical instabilities
142 ptRMS = TMath::Sqrt(etbg2-meanpt*meanpt);
143 }
144 }
70e58892 145 Double_t dEtTotal = (TMath::Sqrt(npart))*TMath::Sqrt(meanpt * meanpt + ptRMS*ptRMS);
146
147 // arrays to hold jets
5382c085 148 Float_t etaJet[kMaxJets];
149 Float_t phiJet[kMaxJets];
150 Float_t etJet[kMaxJets];
151 Float_t etsigJet[kMaxJets]; //signal et in jet
152 Float_t etallJet[kMaxJets]; // total et in jet (tmp variable)
153 Int_t ncellsJet[kMaxJets];
154 Int_t multJet[kMaxJets];
70e58892 155 Int_t nJets; // to hold number of jets found by algorithm
156 Int_t nj; // number of jets accepted
7d0f353c 157 Float_t prec = header->GetPrecBg();
70e58892 158 Float_t bgprec = 1;
159 while(bgprec > prec){
160 //reset jet arrays in memory
5382c085 161 memset(etaJet,0,sizeof(Float_t)*kMaxJets);
162 memset(phiJet,0,sizeof(Float_t)*kMaxJets);
163 memset(etJet,0,sizeof(Float_t)*kMaxJets);
164 memset(etallJet,0,sizeof(Float_t)*kMaxJets);
165 memset(etsigJet,0,sizeof(Float_t)*kMaxJets);
166 memset(ncellsJet,0,sizeof(Int_t)*kMaxJets);
167 memset(multJet,0,sizeof(Int_t)*kMaxJets);
70e58892 168 nJets = 0;
169 nj = 0;
170 // reset particles-jet array in memory
98e98c1c 171 memset(injet,-1,sizeof(Int_t)*nIn);
70e58892 172 //run cone algorithm finder
173 RunAlgoritm(etbgTotal,dEtTotal,nJets,etJet,etaJet,phiJet,etallJet,ncellsJet);
174 //run background subtraction
7d0f353c 175 if(nJets > header->GetNAcceptJets()) // limited number of accepted jets per event
176 nj = header->GetNAcceptJets();
70e58892 177 else
178 nj = nJets;
179 //subtract background
180 Float_t etbgTotalN = 0.0; //new background
7d0f353c 181 if(header->GetBackgMode() == 1) // standar
70e58892 182 SubtractBackg(nIn,nj,etbgTotalN,ptT,etaT,phiT,etJet,etaJet,phiJet,etsigJet,multJet,injet);
7d0f353c 183 if(header->GetBackgMode() == 2) //cone
70e58892 184 SubtractBackgCone(nIn,nj,etbgTotalN,ptT,etaT,phiT,etJet,etaJet,phiJet,etsigJet,multJet,injet);
7d0f353c 185 if(header->GetBackgMode() == 3) //ratio
70e58892 186 SubtractBackgRatio(nIn,nj,etbgTotalN,ptT,etaT,phiT,etJet,etaJet,phiJet,etsigJet,multJet,injet);
7d0f353c 187 if(header->GetBackgMode() == 4) //statistic
70e58892 188 SubtractBackgStat(nIn,nj,etbgTotalN,ptT,etaT,phiT,etJet,etaJet,phiJet,etsigJet,multJet,injet);
189 //calc precision
190 if(etbgTotalN != 0.0)
191 bgprec = (etbgTotal - etbgTotalN)/etbgTotalN;
192 else
193 bgprec = 0;
194 etbgTotal = etbgTotalN; // update with new background estimation
195 } //end while
196
f1744ef9 197 // add tracks to the jet if it wasn't yet done
198 if (header->GetBackgMode() == 0){
199 Float_t rc= header->GetRadius();
200 for(Int_t jpart = 0; jpart < nIn; jpart++){ // loop for all particles in array
201 for(Int_t ijet=0; ijet<nj; ijet++){
202 Float_t deta = etaT[jpart] - etaJet[ijet];
203 Float_t dphi = phiT[jpart] - phiJet[ijet];
204 if (dphi < -TMath::Pi()) dphi= -dphi - 2.0 * TMath::Pi();
205 if (dphi > TMath::Pi()) dphi = 2.0 * TMath::Pi() - dphi;
206 Float_t dr = TMath::Sqrt(deta * deta + dphi * dphi);
207 if(dr <= rc){ // particles inside this cone
208 injet[jpart] = ijet;
209 break;
210 }
211 }// end jets loop
212 } //end particle loop
213 }
214
70e58892 215 // add jets to list
5e380e7e 216 Int_t idxjets[kMaxJets];
70e58892 217 Int_t nselectj = 0;
5e380e7e 218
c02b94ea 219 TRefArray *refs = 0;
220 Bool_t fromAod = !strcmp(fReader->ClassName(),"AliJetAODReader");
221 if (fromAod) refs = fReader->GetReferences();
204f63f1 222 Float_t rc= header->GetRadius();
70e58892 223 for(Int_t kj=0; kj<nj; kj++){
7d0f353c 224 if ((etaJet[kj] > (header->GetJetEtaMax())) ||
225 (etaJet[kj] < (header->GetJetEtaMin())) ||
226 (etJet[kj] < header->GetMinJetEt())) continue; // acceptance eta range and etmin
70e58892 227 Float_t px, py,pz,en; // convert to 4-vector
228 px = etJet[kj] * TMath::Cos(phiJet[kj]);
229 py = etJet[kj] * TMath::Sin(phiJet[kj]);
230 pz = etJet[kj] / TMath::Tan(2.0 * TMath::ATan(TMath::Exp(-etaJet[kj])));
231 en = TMath::Sqrt(px * px + py * py + pz * pz);
42b0ac89 232
1d27ecd2 233 AliAODJet jet(px, py, pz, en);
1eef1eb4 234
c02b94ea 235 if (fromAod){
236 for(Int_t jpart = 0; jpart < nIn; jpart++) // loop for all particles in array
237 if (injet[jpart] == kj && fReader->GetCutFlag(jpart) == 1)
238 jet.AddTrack(refs->At(jpart)); // check if the particle belongs to the jet and add the ref
239 }
1eef1eb4 240
99513b18 241 //jet.Print("");
1d27ecd2 242
204f63f1 243 // calculate the area of the jet
244 Float_t detamax = etaJet[kj] + rc;
245 Float_t detamin = etaJet[kj] - rc;
246 Float_t accmax = 0.0; Float_t accmin = 0.0;
247 if(detamax > header->GetLegoEtaMax()){ // sector outside etamax
248 Float_t h = header->GetLegoEtaMax() - etaJet[kj];
249 accmax = rc*rc*TMath::ACos(h/rc) - h*TMath::Sqrt(rc*rc - h*h);
250 }
251 if(detamin < header->GetLegoEtaMin()){ // sector outside etamin
252 Float_t h = header->GetLegoEtaMax() + etaJet[kj];
253 accmin = rc*rc*TMath::ACos(h/rc) - h*TMath::Sqrt(rc*rc - h*h);
254 }
255 Float_t areaJet = rc*rc*TMath::Pi() - accmax - accmin;
256 // set both areas
257 jet.SetEffArea(areaJet,areaJet);
258
1d27ecd2 259 AddJet(jet);
260
70e58892 261 idxjets[nselectj] = kj;
262 nselectj++;
1eef1eb4 263 } //end particle loop
264
70e58892 265 //add signal percentage and total signal in AliJets for analysis tool
5e380e7e 266 Float_t percentage[kMaxJets];
267 Int_t ncells[kMaxJets];
268 Int_t mult[kMaxJets];
70e58892 269 for(Int_t i = 0; i< nselectj; i++){
270 percentage[i] = etsigJet[idxjets[i]]/etJet[idxjets[i]];
271 ncells[i] = ncellsJet[idxjets[i]];
272 mult[i] = multJet[idxjets[i]];
273 }
98e98c1c 274 //add particle-injet relationship ///
275 for(Int_t bj = 0; bj < nIn; bj++){
276 if(injet[bj] == -1) continue; //background particle
277 Int_t bflag = 0;
278 for(Int_t ci = 0; ci< nselectj; ci++){
279 if(injet[bj] == idxjets[ci]){
280 injet[bj]= ci;
281 bflag++;
282 break;
283 }
284 }
285 if(bflag == 0) injet[bj] = -1; // set as background particle
286 }
70e58892 287
288 //delete
0ab34e91 289 delete [] ptT;
290 delete [] etaT;
291 delete [] phiT;
292 delete [] injet;
70e58892 293}
294
295////////////////////////////////////////////////////////////////////////
296
297void AliUA1JetFinderV1::RunAlgoritm(Float_t etbgTotal, Double_t dEtTotal, Int_t& nJets,
298 Float_t* etJet,Float_t* etaJet, Float_t* phiJet,
299 Float_t* etallJet, Int_t* ncellsJet)
300{
301
302 //dump lego
7d0f353c 303 AliUA1JetHeaderV1* header = (AliUA1JetHeaderV1*) fHeader;
d9eba389 304 const Int_t nBinsMax = 120000; // we use a fixed array not to fragment memory
9dda5307 305
d9eba389 306 const Int_t nBinEta = header->GetLegoNbinEta();
307 const Int_t nBinPhi = header->GetLegoNbinPhi();
308 if((nBinPhi*nBinEta)>nBinsMax){
309 AliError("Too many bins of the ETA-PHI histogram");
310 }
311
0ab34e91 312 Float_t etCell[nBinsMax]; //! Cell Energy
313 Float_t etaCell[nBinsMax]; //! Cell eta
314 Float_t phiCell[nBinsMax]; //! Cell phi
d9eba389 315 Short_t flagCell[nBinsMax]; //! Cell flag
70e58892 316
317 Int_t nCell = 0;
318 TAxis* xaxis = fLego->GetXaxis();
319 TAxis* yaxis = fLego->GetYaxis();
320 Float_t e = 0.0;
d9eba389 321 for (Int_t i = 1; i <= nBinEta; i++) {
322 for (Int_t j = 1; j <= nBinPhi; j++) {
70e58892 323 e = fLego->GetBinContent(i,j);
324 if (e < 0.0) continue; // don't include this cells
325 Float_t eta = xaxis->GetBinCenter(i);
326 Float_t phi = yaxis->GetBinCenter(j);
327 etCell[nCell] = e;
328 etaCell[nCell] = eta;
329 phiCell[nCell] = phi;
0ab34e91 330 flagCell[nCell] = 0; //default
70e58892 331 nCell++;
332 }
333 }
334
335 // Parameters from header
7d0f353c 336 Float_t minmove = header->GetMinMove();
337 Float_t maxmove = header->GetMaxMove();
338 Float_t rc = header->GetRadius();
339 Float_t etseed = header->GetEtSeed();
340 //Float_t etmin = header->GetMinJetEt();
70e58892 341
342
343
344 // tmp array of jets form algoritm
8ddcf605 345 Float_t etaAlgoJet[kMaxJets] = {0.0};
346 Float_t phiAlgoJet[kMaxJets] = {0.0};
347 Float_t etAlgoJet[kMaxJets] = {0.0};
348 Int_t ncellsAlgoJet[kMaxJets] = {0};
70e58892 349
350 //run algorithm//
351
352 // sort cells by et
5e380e7e 353 Int_t index[nBinsMax];
70e58892 354 TMath::Sort(nCell, etCell, index);
355 // variable used in centroide loop
9dda5307 356 Float_t eta = 0.0;
357 Float_t phi = 0.0;
358 Float_t eta0 = 0.0;
359 Float_t phi0 = 0.0;
360 Float_t etab = 0.0;
361 Float_t phib = 0.0;
362 Float_t etas = 0.0;
363 Float_t phis = 0.0;
364 Float_t ets = 0.0;
365 Float_t deta = 0.0;
366 Float_t dphi = 0.0;
367 Float_t dr = 0.0;
368 Float_t etsb = 0.0;
70e58892 369 Float_t etasb = 0.0;
370 Float_t phisb = 0.0;
9dda5307 371 Float_t dphib = 0.0;
372
70e58892 373
374 for(Int_t icell = 0; icell < nCell; icell++){
375 Int_t jcell = index[icell];
376 if(etCell[jcell] <= etseed) continue; // if cell energy is low et seed
377 if(flagCell[jcell] != 0) continue; // if cell was used before
378 eta = etaCell[jcell];
379 phi = phiCell[jcell];
380 eta0 = eta;
381 phi0 = phi;
382 etab = eta;
383 phib = phi;
384 ets = etCell[jcell];
385 etas = 0.0;
386 phis = 0.0;
387 etsb = ets;
388 etasb = 0.0;
389 phisb = 0.0;
390 for(Int_t kcell =0; kcell < nCell; kcell++){
391 Int_t lcell = index[kcell];
9dda5307 392 if(lcell == jcell) continue; // cell itself
393 if(flagCell[lcell] != 0) continue; // cell used before
394 if(etCell[lcell] > etCell[jcell]) continue; // can this happen
70e58892 395 //calculate dr
396 deta = etaCell[lcell] - eta;
9dda5307 397 dphi = TMath::Abs(phiCell[lcell] - phi);
398 if (dphi > TMath::Pi()) dphi = 2. * TMath::Pi() - dphi;
399 dr = TMath::Sqrt(deta * deta + dphi * dphi);
70e58892 400 if(dr <= rc){
401 // calculate offset from initiate cell
402 deta = etaCell[lcell] - eta0;
403 dphi = phiCell[lcell] - phi0;
9dda5307 404 if (dphi < - TMath::Pi()) dphi= dphi + 2.0 * TMath::Pi();
405 if (dphi > TMath::Pi()) dphi = dphi - 2.0 * TMath::Pi();
406
70e58892 407 etas = etas + etCell[lcell]*deta;
408 phis = phis + etCell[lcell]*dphi;
409 ets = ets + etCell[lcell];
410 //new weighted eta and phi including this cell
411 eta = eta0 + etas/ets;
412 phi = phi0 + phis/ets;
413 // if cone does not move much, just go to next step
9dda5307 414 dphib = TMath::Abs(phi - phib);
415 if (dphib > TMath::Pi()) dphib = 2. * TMath::Pi() - dphib;
416 dr = TMath::Sqrt((eta-etab)*(eta-etab) + dphib * dphib);
70e58892 417 if(dr <= minmove) break;
418 // cone should not move more than max_mov
419 dr = TMath::Sqrt((etas/ets)*(etas/ets) + (phis/ets)*(phis/ets));
420 if(dr > maxmove){
9dda5307 421 eta = etab;
422 phi = phib;
423 ets = etsb;
424 etas = etasb;
425 phis = phisb;
426 } else { // store this loop information
427 etab = eta;
428 phib = phi;
429 etsb = ets;
430 etasb = etas;
431 phisb = phis;
70e58892 432 }
9dda5307 433 } // inside cone
70e58892 434 }//end of cells loop looking centroide
435
436 //avoid cones overloap (to be implemented in the future)
437
438 //flag cells in Rc, estimate total energy in cone
439 Float_t etCone = 0.0;
440 Int_t nCellIn = 0;
7d0f353c 441 rc = header->GetRadius();
70e58892 442 for(Int_t ncell =0; ncell < nCell; ncell++){
443 if(flagCell[ncell] != 0) continue; // cell used before
444 //calculate dr
445 deta = etaCell[ncell] - eta;
446 dphi = phiCell[ncell] - phi;
447 if (dphi < -TMath::Pi()) dphi= -dphi - 2.0 * TMath::Pi();
448 if (dphi > TMath::Pi()) dphi = 2.0 * TMath::Pi() - dphi;
449 dr = TMath::Sqrt(deta * deta + dphi * dphi);
450 if(dr <= rc){ // cell in cone
451 flagCell[ncell] = -1;
452 etCone+=etCell[ncell];
453 nCellIn++;
454 }
455 }
456
457 // select jets with et > background
458 // estimate max fluctuation of background in cone
459 Double_t ncellin = (Double_t)nCellIn;
460 Double_t ntcell = (Double_t)nCell;
461 Double_t etbmax = (etbgTotal + dEtTotal )*(ncellin/ntcell);
462 // min cone et
463 Double_t etcmin = etCone ; // could be used etCone - etmin !!
464 //desicions !! etbmax < etcmin
465 for(Int_t mcell =0; mcell < nCell; mcell++){
466 if(flagCell[mcell] == -1){
467 if(etbmax < etcmin)
468 flagCell[mcell] = 1; //flag cell as used
469 else
470 flagCell[mcell] = 0; // leave it free
471 }
472 }
473 //store tmp jet info !!!
98e98c1c 474 if(etbmax < etcmin) {
5e380e7e 475 if(nJets<kMaxJets){
476 etaAlgoJet[nJets] = eta;
477 phiAlgoJet[nJets] = phi;
478 etAlgoJet[nJets] = etCone;
479 ncellsAlgoJet[nJets] = nCellIn;
480 nJets++;
481 }
482 else{
483 AliError(Form("Too many jets (> %d) found by UA1JetFinder, adapt your cuts",kMaxJets));
484 break;
485 }
486 }
70e58892 487 } // end of cells loop
488
489 //reorder jets by et in cone
490 //sort jets by energy
5e380e7e 491 Int_t idx[kMaxJets];
492 TMath::Sort(nJets, etAlgoJet, idx); // sort only the found jets
70e58892 493 for(Int_t p = 0; p < nJets; p++){
494 etaJet[p] = etaAlgoJet[idx[p]];
495 phiJet[p] = phiAlgoJet[idx[p]];
496 etJet[p] = etAlgoJet[idx[p]];
497 etallJet[p] = etAlgoJet[idx[p]];
498 ncellsJet[p] = ncellsAlgoJet[idx[p]];
499 }
500
70e58892 501}
502////////////////////////////////////////////////////////////////////////
503
63cdee97 504void AliUA1JetFinderV1::SubtractBackg(const Int_t& nIn, const Int_t&nJ, Float_t&etbgTotalN,
505 const Float_t* ptT, const Float_t* etaT, const Float_t* phiT,
506 Float_t* etJet, const Float_t* etaJet, const Float_t* phiJet, Float_t* etsigJet,
507 Int_t* multJet, Int_t* injet)
70e58892 508{
509 //background subtraction using cone method but without correction in dE/deta distribution
510
511 //calculate energy inside and outside cones
7d0f353c 512 AliUA1JetHeaderV1* header = (AliUA1JetHeaderV1*) fHeader;
513 Float_t rc= header->GetRadius();
8ddcf605 514 Float_t etIn[kMaxJets] = {0};
70e58892 515 Float_t etOut = 0;
516 for(Int_t jpart = 0; jpart < nIn; jpart++){ // loop for all particles in array
98e98c1c 517 // if((fReader->GetCutFlag(jpart)) != 1) continue; // pt cut
70e58892 518 for(Int_t ijet=0; ijet<nJ; ijet++){
519 Float_t deta = etaT[jpart] - etaJet[ijet];
520 Float_t dphi = phiT[jpart] - phiJet[ijet];
521 if (dphi < -TMath::Pi()) dphi= -dphi - 2.0 * TMath::Pi();
522 if (dphi > TMath::Pi()) dphi = 2.0 * TMath::Pi() - dphi;
523 Float_t dr = TMath::Sqrt(deta * deta + dphi * dphi);
524 if(dr <= rc){ // particles inside this cone
70e58892 525 multJet[ijet]++;
526 injet[jpart] = ijet;
98e98c1c 527 if((fReader->GetCutFlag(jpart)) == 1){ // pt cut
528 etIn[ijet] += ptT[jpart];
529 if(fReader->GetSignalFlag(jpart) == 1) etsigJet[ijet]+= ptT[jpart];
530 }
70e58892 531 break;
532 }
533 }// end jets loop
970a3bbc 534 if(injet[jpart] == -1 && fReader->GetCutFlag(jpart) == 1)
98e98c1c 535 etOut += ptT[jpart]; // particle outside cones and pt cut
70e58892 536 } //end particle loop
537
538 //estimate jets and background areas
5e380e7e 539 Float_t areaJet[kMaxJets];
7d0f353c 540 Float_t areaOut = 4*(header->GetLegoEtaMax())*TMath::Pi();
70e58892 541 for(Int_t k=0; k<nJ; k++){
542 Float_t detamax = etaJet[k] + rc;
543 Float_t detamin = etaJet[k] - rc;
544 Float_t accmax = 0.0; Float_t accmin = 0.0;
7d0f353c 545 if(detamax > header->GetLegoEtaMax()){ // sector outside etamax
546 Float_t h = header->GetLegoEtaMax() - etaJet[k];
70e58892 547 accmax = rc*rc*TMath::ACos(h/rc) - h*TMath::Sqrt(rc*rc - h*h);
548 }
7d0f353c 549 if(detamin < header->GetLegoEtaMin()){ // sector outside etamin
550 Float_t h = header->GetLegoEtaMax() + etaJet[k];
70e58892 551 accmin = rc*rc*TMath::ACos(h/rc) - h*TMath::Sqrt(rc*rc - h*h);
552 }
553 areaJet[k] = rc*rc*TMath::Pi() - accmax - accmin;
554 areaOut = areaOut - areaJet[k];
555 }
556 //subtract background using area method
557 for(Int_t ljet=0; ljet<nJ; ljet++){
558 Float_t areaRatio = areaJet[ljet]/areaOut;
559 etJet[ljet] = etIn[ljet]-etOut*areaRatio; // subtraction
560 }
561
562 // estimate new total background
7d0f353c 563 Float_t areaT = 4*(header->GetLegoEtaMax())*TMath::Pi();
70e58892 564 etbgTotalN = etOut*areaT/areaOut;
565
566
567}
568
569////////////////////////////////////////////////////////////////////////
570
63cdee97 571void AliUA1JetFinderV1::SubtractBackgStat(const Int_t& nIn, const Int_t&nJ,Float_t&etbgTotalN,
572 const Float_t* ptT, const Float_t* etaT, const Float_t* phiT,
573 Float_t* etJet, const Float_t* etaJet, const Float_t* phiJet, Float_t* etsigJet,
574 Int_t* multJet, Int_t* injet)
70e58892 575{
576
577 //background subtraction using statistical method
7d0f353c 578 AliUA1JetHeaderV1* header = (AliUA1JetHeaderV1*) fHeader;
579 Float_t etbgStat = header->GetBackgStat(); // pre-calculated background
70e58892 580
581 //calculate energy inside
7d0f353c 582 Float_t rc= header->GetRadius();
8ddcf605 583 Float_t etIn[kMaxJets] = {0.0};
70e58892 584
585 for(Int_t jpart = 0; jpart < nIn; jpart++){ // loop for all particles in array
98e98c1c 586 //if((fReader->GetCutFlag(jpart)) != 1) continue; // pt cut
70e58892 587 for(Int_t ijet=0; ijet<nJ; ijet++){
588 Float_t deta = etaT[jpart] - etaJet[ijet];
589 Float_t dphi = phiT[jpart] - phiJet[ijet];
590 if (dphi < -TMath::Pi()) dphi= -dphi - 2.0 * TMath::Pi();
591 if (dphi > TMath::Pi()) dphi = 2.0 * TMath::Pi() - dphi;
592 Float_t dr = TMath::Sqrt(deta * deta + dphi * dphi);
593 if(dr <= rc){ // particles inside this cone
70e58892 594 multJet[ijet]++;
595 injet[jpart] = ijet;
98e98c1c 596 if((fReader->GetCutFlag(jpart)) == 1){ // pt cut
597 etIn[ijet]+= ptT[jpart];
598 if(fReader->GetSignalFlag(jpart) == 1) etsigJet[ijet] += ptT[jpart];
599 }
70e58892 600 break;
601 }
602 }// end jets loop
603 } //end particle loop
604
605 //calc jets areas
5e380e7e 606 Float_t areaJet[kMaxJets];
7d0f353c 607 Float_t areaOut = 4*(header->GetLegoEtaMax())*TMath::Pi();
70e58892 608 for(Int_t k=0; k<nJ; k++){
609 Float_t detamax = etaJet[k] + rc;
610 Float_t detamin = etaJet[k] - rc;
611 Float_t accmax = 0.0; Float_t accmin = 0.0;
7d0f353c 612 if(detamax > header->GetLegoEtaMax()){ // sector outside etamax
613 Float_t h = header->GetLegoEtaMax() - etaJet[k];
70e58892 614 accmax = rc*rc*TMath::ACos(h/rc) - h*TMath::Sqrt(rc*rc - h*h);
615 }
7d0f353c 616 if(detamin < header->GetLegoEtaMin()){ // sector outside etamin
617 Float_t h = header->GetLegoEtaMax() + etaJet[k];
70e58892 618 accmin = rc*rc*TMath::ACos(h/rc) - h*TMath::Sqrt(rc*rc - h*h);
619 }
620 areaJet[k] = rc*rc*TMath::Pi() - accmax - accmin;
621 }
622
623 //subtract background using area method
624 for(Int_t ljet=0; ljet<nJ; ljet++){
625 Float_t areaRatio = areaJet[ljet]/areaOut;
626 etJet[ljet] = etIn[ljet]-etbgStat*areaRatio; // subtraction
627 }
628
629 etbgTotalN = etbgStat;
630
631}
632
633////////////////////////////////////////////////////////////////////////
634
63cdee97 635void AliUA1JetFinderV1::SubtractBackgCone(const Int_t& nIn, const Int_t&nJ,Float_t& etbgTotalN,
636 const Float_t* ptT, const Float_t* etaT, const Float_t* phiT,
637 Float_t* etJet, const Float_t* etaJet, const Float_t* phiJet, Float_t* etsigJet,
638 Int_t* multJet, Int_t* injet)
70e58892 639{
640 // Cone background subtraction method taking into acount dEt/deta distribution
7d0f353c 641 AliUA1JetHeaderV1* header = (AliUA1JetHeaderV1*) fHeader;
70e58892 642 //general
7d0f353c 643 Float_t rc= header->GetRadius();
644 Float_t etamax = header->GetLegoEtaMax();
645 Float_t etamin = header->GetLegoEtaMin();
70e58892 646 Int_t ndiv = 100;
647
648 // jet energy and area arrays
bc64c053 649 Bool_t oldStatus = TH1::AddDirectoryStatus();
650 TH1::AddDirectory(kFALSE);
651
70e58892 652 for(Int_t mjet=0; mjet<nJ; mjet++){
5e380e7e 653 if(!fhEtJet[mjet]){
8ddcf605 654 fhEtJet[mjet] = new TH1F(Form("hEtJet%d", mjet),"et dist in eta ",ndiv,etamin,etamax);
5e380e7e 655 }
8ddcf605 656 if(!fhAreaJet[mjet]){
657 fhAreaJet[mjet] = new TH1F(Form("hEtJet%d", mjet),"area dist in eta ",ndiv,etamin,etamax);
5e380e7e 658 }
659 fhEtJet[mjet]->Reset();
660 fhAreaJet[mjet]->Reset();
661 }
70e58892 662 // background energy and area
5e380e7e 663 if(!fhEtBackg)fhEtBackg = new TH1F("hEtBackg"," backg et dist in eta ",ndiv,etamin,etamax);
664 fhEtBackg->Reset();
665 if(!fhAreaBackg) fhAreaBackg = new TH1F("hAreaBackg","backg area dist in eta ",ndiv,etamin,etamax);
666 fhAreaBackg->Reset();
bc64c053 667 TH1::AddDirectory(oldStatus);
70e58892 668
669 //fill energies
670 for(Int_t jpart = 0; jpart < nIn; jpart++){ // loop for all particles in array
70e58892 671 for(Int_t ijet=0; ijet<nJ; ijet++){ // loop for all jets
672 Float_t deta = etaT[jpart] - etaJet[ijet];
98e98c1c 673 Float_t dphi = phiT[jpart] - phiJet[ijet];
70e58892 674 if (dphi < -TMath::Pi()) dphi= -dphi - 2.0 * TMath::Pi();
98e98c1c 675 if (dphi > TMath::Pi()) dphi = 2.0 * TMath::Pi() - dphi;
676 Float_t dr = TMath::Sqrt(deta * deta + dphi * dphi);
70e58892 677 if(dr <= rc){ // particles inside this cone
70e58892 678 injet[jpart] = ijet;
98e98c1c 679 multJet[ijet]++;
680 if((fReader->GetCutFlag(jpart)) == 1){// pt cut
5e380e7e 681 fhEtJet[ijet]->Fill(etaT[jpart],ptT[jpart]); //particle inside cone
98e98c1c 682 if(fReader->GetSignalFlag(jpart) == 1) etsigJet[ijet] += ptT[jpart];
683 }
70e58892 684 break;
685 }
686 }// end jets loop
970a3bbc 687 if(injet[jpart] == -1 && fReader->GetCutFlag(jpart) == 1)
5e380e7e 688 fhEtBackg->Fill(etaT[jpart],ptT[jpart]); // particle outside cones
70e58892 689 } //end particle loop
690
691 //calc areas
692 Float_t eta0 = etamin;
693 Float_t etaw = (etamax - etamin)/((Float_t)ndiv);
694 Float_t eta1 = eta0 + etaw;
695 for(Int_t etabin = 0; etabin< ndiv; etabin++){ // loop for all eta bins
696 Float_t etac = eta0 + etaw/2.0;
697 Float_t areabg = etaw*2.0*TMath::Pi();
698 for(Int_t ijet=0; ijet<nJ; ijet++){ // loop for all jets
699 Float_t deta0 = TMath::Abs(eta0 - etaJet[ijet]);
700 Float_t deta1 = TMath::Abs(eta1 - etaJet[ijet]);
701 Float_t acc0 = 0.0; Float_t acc1 = 0.0;
702 Float_t areaj = 0.0;
703 if(deta0 > rc && deta1 < rc){
704 acc1 = rc*rc*TMath::ACos(deta1/rc) - deta1*TMath::Sqrt(rc*rc - deta1*deta1);
705 areaj = acc1;
706 }
707 if(deta0 < rc && deta1 > rc){
708 acc0 = rc*rc*TMath::ACos(deta0/rc) - deta0*TMath::Sqrt(rc*rc - deta0*deta0);
709 areaj = acc0;
710 }
711 if(deta0 < rc && deta1 < rc){
712 acc0 = rc*rc*TMath::ACos(deta0/rc) - deta0*TMath::Sqrt(rc*rc - deta0*deta0);
713 acc1 = rc*rc*TMath::ACos(deta1/rc) - deta1*TMath::Sqrt(rc*rc - deta1*deta1);
714 if(eta1<etaJet[ijet]) areaj = acc1-acc0; // case 1
715 if((eta0 < etaJet[ijet]) && (etaJet[ijet]<eta1)) areaj = rc*rc*TMath::Pi() - acc1 -acc0; // case 2
716 if(etaJet[ijet] < eta0) areaj = acc0 -acc1; // case 3
717 }
5e380e7e 718 fhAreaJet[ijet]->Fill(etac,areaj);
70e58892 719 areabg = areabg - areaj;
720 } // end jets loop
5e380e7e 721 fhAreaBackg->Fill(etac,areabg);
70e58892 722 eta0 = eta1;
723 eta1 = eta1 + etaw;
724 } // end loop for all eta bins
725
726 //subtract background
727 for(Int_t kjet=0; kjet<nJ; kjet++){
728 etJet[kjet] = 0.0; // first clear etJet for this jet
729 for(Int_t bin = 0; bin< ndiv; bin++){
5e380e7e 730 if(fhAreaJet[kjet]->GetBinContent(bin)){
731 Float_t areab = fhAreaBackg->GetBinContent(bin);
732 Float_t etb = fhEtBackg->GetBinContent(bin);
733 Float_t areaR = (fhAreaJet[kjet]->GetBinContent(bin))/areab;
734 etJet[kjet] = etJet[kjet] + ((fhEtJet[kjet]->GetBinContent(bin)) - etb*areaR); //subtraction
70e58892 735 }
736 }
737 }
738
739 // calc background total
5e380e7e 740 Double_t etOut = fhEtBackg->Integral();
741 Double_t areaOut = fhAreaBackg->Integral();
7d0f353c 742 Float_t areaT = 4*(header->GetLegoEtaMax())*TMath::Pi();
70e58892 743 etbgTotalN = etOut*areaT/areaOut;
70e58892 744}
745
746////////////////////////////////////////////////////////////////////////
747
748
63cdee97 749void AliUA1JetFinderV1::SubtractBackgRatio(const Int_t& nIn, const Int_t&nJ, Float_t& etbgTotalN,
750 const Float_t* ptT, const Float_t* etaT, const Float_t* phiT,
751 Float_t* etJet, const Float_t* etaJet, const Float_t* phiJet, Float_t* etsigJet,
752 Int_t* multJet, Int_t* injet)
70e58892 753{
754 // Ratio background subtraction method taking into acount dEt/deta distribution
7d0f353c 755 AliUA1JetHeaderV1* header = (AliUA1JetHeaderV1*) fHeader;
70e58892 756 //factor F calc before
7d0f353c 757 Float_t bgRatioCut = header->GetBackgCutRatio();
70e58892 758
759
760 //general
7d0f353c 761 Float_t rc= header->GetRadius();
762 Float_t etamax = header->GetLegoEtaMax();
763 Float_t etamin = header->GetLegoEtaMin();
70e58892 764 Int_t ndiv = 100;
765
766 // jet energy and area arrays
5e380e7e 767 // jet energy and area arrays
bc64c053 768
769 Bool_t oldStatus = TH1::AddDirectoryStatus();
770 TH1::AddDirectory(kFALSE);
70e58892 771 for(Int_t mjet=0; mjet<nJ; mjet++){
5e380e7e 772 if(!fhEtJet[mjet]){
8ddcf605 773 fhEtJet[mjet] = new TH1F(Form("hEtJet%d", mjet),"et dist in eta ",ndiv,etamin,etamax);
5e380e7e 774 }
775 if(!fhAreaJet[mjet]){
8ddcf605 776 fhAreaJet[mjet] = new TH1F(Form("hAreaJet%d", mjet),"area dist in eta ",ndiv,etamin,etamax);
5e380e7e 777 }
778 fhEtJet[mjet]->Reset();
779 fhAreaJet[mjet]->Reset();
780 }
70e58892 781 // background energy and area
5e380e7e 782 if(!fhEtBackg)fhEtBackg = new TH1F("hEtBackg"," backg et dist in eta ",ndiv,etamin,etamax);
783 fhEtBackg->Reset();
784 if(!fhAreaBackg) fhAreaBackg = new TH1F("hAreaBackg","backg area dist in eta ",ndiv,etamin,etamax);
785 fhAreaBackg->Reset();
bc64c053 786 TH1::AddDirectory(oldStatus);
70e58892 787
788 //fill energies
789 for(Int_t jpart = 0; jpart < nIn; jpart++){ // loop for all particles in array
98e98c1c 790 //if((fReader->GetCutFlag(jpart)) != 1) continue;
70e58892 791 for(Int_t ijet=0; ijet<nJ; ijet++){ // loop for all jets
792 Float_t deta = etaT[jpart] - etaJet[ijet];
793 Float_t dphi = phiT[jpart] - phiJet[ijet];
794 if (dphi < -TMath::Pi()) dphi= -dphi - 2.0 * TMath::Pi();
795 if (dphi > TMath::Pi()) dphi = 2.0 * TMath::Pi() - dphi;
796 Float_t dr = TMath::Sqrt(deta * deta + dphi * dphi);
797 if(dr <= rc){ // particles inside this cone
70e58892 798 multJet[ijet]++;
799 injet[jpart] = ijet;
98e98c1c 800 if((fReader->GetCutFlag(jpart)) == 1){ //pt cut
5e380e7e 801 fhEtJet[ijet]->Fill(etaT[jpart],ptT[jpart]); //particle inside cone and pt cut
98e98c1c 802 if(fReader->GetSignalFlag(jpart) == 1) etsigJet[ijet] += ptT[jpart];
803 }
70e58892 804 break;
805 }
806 }// end jets loop
5e380e7e 807 if(injet[jpart] == -1) fhEtBackg->Fill(etaT[jpart],ptT[jpart]); // particle outside cones
70e58892 808 } //end particle loop
809
810 //calc areas
811 Float_t eta0 = etamin;
812 Float_t etaw = (etamax - etamin)/((Float_t)ndiv);
813 Float_t eta1 = eta0 + etaw;
814 for(Int_t etabin = 0; etabin< ndiv; etabin++){ // loop for all eta bins
815 Float_t etac = eta0 + etaw/2.0;
816 Float_t areabg = etaw*2.0*TMath::Pi();
817 for(Int_t ijet=0; ijet<nJ; ijet++){ // loop for all jets
818 Float_t deta0 = TMath::Abs(eta0 - etaJet[ijet]);
819 Float_t deta1 = TMath::Abs(eta1 - etaJet[ijet]);
820 Float_t acc0 = 0.0; Float_t acc1 = 0.0;
821 Float_t areaj = 0.0;
822 if(deta0 > rc && deta1 < rc){
823 acc1 = rc*rc*TMath::ACos(deta1/rc) - deta1*TMath::Sqrt(rc*rc - deta1*deta1);
824 areaj = acc1;
825 }
826 if(deta0 < rc && deta1 > rc){
827 acc0 = rc*rc*TMath::ACos(deta0/rc) - deta0*TMath::Sqrt(rc*rc - deta0*deta0);
828 areaj = acc0;
829 }
830 if(deta0 < rc && deta1 < rc){
831 acc0 = rc*rc*TMath::ACos(deta0/rc) - deta0*TMath::Sqrt(rc*rc - deta0*deta0);
832 acc1 = rc*rc*TMath::ACos(deta1/rc) - deta1*TMath::Sqrt(rc*rc - deta1*deta1);
833 if(eta1<etaJet[ijet]) areaj = acc1-acc0; // case 1
834 if((eta0 < etaJet[ijet]) && (etaJet[ijet]<eta1)) areaj = rc*rc*TMath::Pi() - acc1 -acc0; // case 2
835 if(etaJet[ijet] < eta0) areaj = acc0 -acc1; // case 3
836 }
5e380e7e 837 fhAreaJet[ijet]->Fill(etac,areaj);
70e58892 838 areabg = areabg - areaj;
839 } // end jets loop
5e380e7e 840 fhAreaBackg->Fill(etac,areabg);
70e58892 841 eta0 = eta1;
842 eta1 = eta1 + etaw;
843 } // end loop for all eta bins
844
845 //subtract background
846 for(Int_t kjet=0; kjet<nJ; kjet++){
847 etJet[kjet] = 0.0; // first clear etJet for this jet
848 for(Int_t bin = 0; bin< ndiv; bin++){
5e380e7e 849 if(fhAreaJet[kjet]->GetBinContent(bin)){
850 Float_t areab = fhAreaBackg->GetBinContent(bin);
851 Float_t etb = fhEtBackg->GetBinContent(bin);
852 Float_t areaR = (fhAreaJet[kjet]->GetBinContent(bin))/areab;
853 etJet[kjet] = etJet[kjet] + ((fhEtJet[kjet]->GetBinContent(bin)) - etb*areaR*bgRatioCut); //subtraction
70e58892 854 }
855 }
856 }
857
858 // calc background total
5e380e7e 859 Double_t etOut = fhEtBackg->Integral();
860 Double_t areaOut = fhAreaBackg->Integral();
7d0f353c 861 Float_t areaT = 4*(header->GetLegoEtaMax())*TMath::Pi();
70e58892 862 etbgTotalN = etOut*areaT/areaOut;
70e58892 863}
864
865////////////////////////////////////////////////////////////////////////
866
867
868void AliUA1JetFinderV1::Reset()
869{
870 fLego->Reset();
ad8ada26 871 AliJetFinder::Reset();
70e58892 872}
873
874////////////////////////////////////////////////////////////////////////
875
446dbc09 876void AliUA1JetFinderV1::WriteJHeaderToFile() const
70e58892 877{
7d0f353c 878 AliUA1JetHeaderV1* header = (AliUA1JetHeaderV1*) fHeader;
7d0f353c 879 header->Write();
70e58892 880}
881
882////////////////////////////////////////////////////////////////////////
883
884void AliUA1JetFinderV1::Init()
885{
886 // initializes some variables
7d0f353c 887 AliUA1JetHeaderV1* header = (AliUA1JetHeaderV1*) fHeader;
70e58892 888 fLego = new
889 TH2F("legoH","eta-phi",
7d0f353c 890 header->GetLegoNbinEta(), header->GetLegoEtaMin(),
891 header->GetLegoEtaMax(), header->GetLegoNbinPhi(),
892 header->GetLegoPhiMin(), header->GetLegoPhiMax());
c1f55a27 893 // Do not store in current dir
894 fLego->SetDirectory(0);
9dda5307 895
70e58892 896}