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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"
36#include "AliJet.h"
1d27ecd2 37#include "AliAODJet.h"
70e58892 38
39
40ClassImp(AliUA1JetFinderV1)
41
9e4cc50d 42/////////////////////////////////////////////////////////////////////
1b7d5d7e 43
9e4cc50d 44AliUA1JetFinderV1::AliUA1JetFinderV1() :
45 AliJetFinder(),
46 fLego(0)
98e98c1c 47{
48 // Constructor
70e58892 49}
50
51////////////////////////////////////////////////////////////////////////
52
53AliUA1JetFinderV1::~AliUA1JetFinderV1()
54
55{
56 // destructor
57}
58
59////////////////////////////////////////////////////////////////////////
60
61
62void AliUA1JetFinderV1::FindJets()
63
64{
65 //1) Fill cell map array
66 //2) calculate total energy and fluctuation level
67 //3) Run algorithm
68 // 3.1) look centroides in cell map
69 // 3.2) calculate total energy in cones
70 // 3.3) flag as a possible jet
71 // 3.4) reorder cones by energy
72 //4) subtract backg in accepted jets
73 //5) fill AliJet list
74
75 // transform input to pt,eta,phi plus lego
7d0f353c 76
77 AliUA1JetHeaderV1* header = (AliUA1JetHeaderV1*) fHeader;
70e58892 78 TClonesArray *lvArray = fReader->GetMomentumArray();
79 Int_t nIn = lvArray->GetEntries();
80 if (nIn == 0) return;
81
82 // local arrays for input
1d27ecd2 83 Float_t* ptT = new Float_t[nIn];
84 Float_t* etaT = new Float_t[nIn];
85 Float_t* phiT = new Float_t[nIn];
70e58892 86 Int_t* injet = new Int_t[nIn];
87
88 //total energy in array
89 Float_t etbgTotal = 0.0;
90 TH1F* hPtTotal = new TH1F("hPt","Pt distribution of all particles ",100,0.0,15.0);
91
92 // load input vectors and calculate total energy in array
93 for (Int_t i = 0; i < nIn; i++){
94 TLorentzVector *lv = (TLorentzVector*) lvArray->At(i);
95 ptT[i] = lv->Pt();
96 etaT[i] = lv->Eta();
97 phiT[i] = ((lv->Phi() < 0) ? (lv->Phi()) + 2 * TMath::Pi() : lv->Phi());
98 if (fReader->GetCutFlag(i) != 1) continue;
9dda5307 99 fLego ->Fill(etaT[i], phiT[i], ptT[i]);
70e58892 100 hPtTotal->Fill(ptT[i]);
101 etbgTotal+= ptT[i];
102 }
9dda5307 103
70e58892 104 fJets->SetNinput(nIn);
105
106 // calculate total energy and fluctuation in map
107 Double_t meanpt = hPtTotal->GetMean();
9dda5307 108 Double_t ptRMS = hPtTotal->GetRMS();
109 Double_t npart = hPtTotal->GetEntries();
70e58892 110 Double_t dEtTotal = (TMath::Sqrt(npart))*TMath::Sqrt(meanpt * meanpt + ptRMS*ptRMS);
111
112 // arrays to hold jets
113 Float_t* etaJet = new Float_t[30];
114 Float_t* phiJet = new Float_t[30];
115 Float_t* etJet = new Float_t[30];
116 Float_t* etsigJet = new Float_t[30]; //signal et in jet
117 Float_t* etallJet = new Float_t[30]; // total et in jet (tmp variable)
118 Int_t* ncellsJet = new Int_t[30];
119 Int_t* multJet = new Int_t[30];
120 Int_t nJets; // to hold number of jets found by algorithm
121 Int_t nj; // number of jets accepted
7d0f353c 122 Float_t prec = header->GetPrecBg();
70e58892 123 Float_t bgprec = 1;
124 while(bgprec > prec){
125 //reset jet arrays in memory
126 memset(etaJet,0,sizeof(Float_t)*30);
127 memset(phiJet,0,sizeof(Float_t)*30);
128 memset(etJet,0,sizeof(Float_t)*30);
129 memset(etallJet,0,sizeof(Float_t)*30);
130 memset(etsigJet,0,sizeof(Float_t)*30);
131 memset(ncellsJet,0,sizeof(Int_t)*30);
132 memset(multJet,0,sizeof(Int_t)*30);
133 nJets = 0;
134 nj = 0;
135 // reset particles-jet array in memory
98e98c1c 136 memset(injet,-1,sizeof(Int_t)*nIn);
70e58892 137 //run cone algorithm finder
138 RunAlgoritm(etbgTotal,dEtTotal,nJets,etJet,etaJet,phiJet,etallJet,ncellsJet);
139 //run background subtraction
7d0f353c 140 if(nJets > header->GetNAcceptJets()) // limited number of accepted jets per event
141 nj = header->GetNAcceptJets();
70e58892 142 else
143 nj = nJets;
144 //subtract background
145 Float_t etbgTotalN = 0.0; //new background
7d0f353c 146 if(header->GetBackgMode() == 1) // standar
70e58892 147 SubtractBackg(nIn,nj,etbgTotalN,ptT,etaT,phiT,etJet,etaJet,phiJet,etsigJet,multJet,injet);
7d0f353c 148 if(header->GetBackgMode() == 2) //cone
70e58892 149 SubtractBackgCone(nIn,nj,etbgTotalN,ptT,etaT,phiT,etJet,etaJet,phiJet,etsigJet,multJet,injet);
7d0f353c 150 if(header->GetBackgMode() == 3) //ratio
70e58892 151 SubtractBackgRatio(nIn,nj,etbgTotalN,ptT,etaT,phiT,etJet,etaJet,phiJet,etsigJet,multJet,injet);
7d0f353c 152 if(header->GetBackgMode() == 4) //statistic
70e58892 153 SubtractBackgStat(nIn,nj,etbgTotalN,ptT,etaT,phiT,etJet,etaJet,phiJet,etsigJet,multJet,injet);
154 //calc precision
155 if(etbgTotalN != 0.0)
156 bgprec = (etbgTotal - etbgTotalN)/etbgTotalN;
157 else
158 bgprec = 0;
159 etbgTotal = etbgTotalN; // update with new background estimation
160 } //end while
161
162 // add jets to list
163 Int_t* idxjets = new Int_t[nj];
164 Int_t nselectj = 0;
99513b18 165// printf("Found %d jets \n", nj);
76c48857 166
70e58892 167 for(Int_t kj=0; kj<nj; kj++){
7d0f353c 168 if ((etaJet[kj] > (header->GetJetEtaMax())) ||
169 (etaJet[kj] < (header->GetJetEtaMin())) ||
170 (etJet[kj] < header->GetMinJetEt())) continue; // acceptance eta range and etmin
70e58892 171 Float_t px, py,pz,en; // convert to 4-vector
172 px = etJet[kj] * TMath::Cos(phiJet[kj]);
173 py = etJet[kj] * TMath::Sin(phiJet[kj]);
174 pz = etJet[kj] / TMath::Tan(2.0 * TMath::ATan(TMath::Exp(-etaJet[kj])));
175 en = TMath::Sqrt(px * px + py * py + pz * pz);
176 fJets->AddJet(px, py, pz, en);
1d27ecd2 177 AliAODJet jet(px, py, pz, en);
99513b18 178 //jet.Print("");
1d27ecd2 179
180 AddJet(jet);
181
70e58892 182 idxjets[nselectj] = kj;
183 nselectj++;
70e58892 184 }
185 //add signal percentage and total signal in AliJets for analysis tool
186 Float_t* percentage = new Float_t[nselectj];
187 Int_t* ncells = new Int_t[nselectj];
188 Int_t* mult = new Int_t[nselectj];
70e58892 189 for(Int_t i = 0; i< nselectj; i++){
190 percentage[i] = etsigJet[idxjets[i]]/etJet[idxjets[i]];
191 ncells[i] = ncellsJet[idxjets[i]];
192 mult[i] = multJet[idxjets[i]];
193 }
98e98c1c 194 //add particle-injet relationship ///
195 for(Int_t bj = 0; bj < nIn; bj++){
196 if(injet[bj] == -1) continue; //background particle
197 Int_t bflag = 0;
198 for(Int_t ci = 0; ci< nselectj; ci++){
199 if(injet[bj] == idxjets[ci]){
200 injet[bj]= ci;
201 bflag++;
202 break;
203 }
204 }
205 if(bflag == 0) injet[bj] = -1; // set as background particle
206 }
70e58892 207 fJets->SetNCells(ncells);
208 fJets->SetPtFromSignal(percentage);
209 fJets->SetMultiplicities(mult);
210 fJets->SetInJet(injet);
211 fJets->SetEtaIn(etaT);
212 fJets->SetPhiIn(phiT);
213 fJets->SetPtIn(ptT);
7d0f353c 214 fJets->SetEtAvg(etbgTotal/(4*(header->GetLegoEtaMax())*TMath::Pi()));
70e58892 215
216
217 //delete
0ab34e91 218 delete [] ptT;
219 delete [] etaT;
220 delete [] phiT;
221 delete [] injet;
70e58892 222 delete hPtTotal;
0ab34e91 223 delete [] etaJet;
224 delete [] phiJet;
225 delete [] etJet;
226 delete [] etsigJet;
227 delete [] etallJet;
228 delete [] ncellsJet;
229 delete [] multJet;
230 delete [] idxjets;
231 delete [] percentage;
232 delete [] ncells;
233 delete [] mult;
70e58892 234
235
236}
237
238////////////////////////////////////////////////////////////////////////
239
240void AliUA1JetFinderV1::RunAlgoritm(Float_t etbgTotal, Double_t dEtTotal, Int_t& nJets,
241 Float_t* etJet,Float_t* etaJet, Float_t* phiJet,
242 Float_t* etallJet, Int_t* ncellsJet)
243{
244
245 //dump lego
246 // check enough space! *to be done*
7d0f353c 247 AliUA1JetHeaderV1* header = (AliUA1JetHeaderV1*) fHeader;
0ab34e91 248 const Int_t nBinsMax = 70000;
9dda5307 249
0ab34e91 250 Float_t etCell[nBinsMax]; //! Cell Energy
251 Float_t etaCell[nBinsMax]; //! Cell eta
252 Float_t phiCell[nBinsMax]; //! Cell phi
253 Int_t flagCell[nBinsMax]; //! Cell flag
70e58892 254
255 Int_t nCell = 0;
256 TAxis* xaxis = fLego->GetXaxis();
257 TAxis* yaxis = fLego->GetYaxis();
258 Float_t e = 0.0;
7d0f353c 259 for (Int_t i = 1; i <= header->GetLegoNbinEta(); i++) {
260 for (Int_t j = 1; j <= header->GetLegoNbinPhi(); j++) {
70e58892 261 e = fLego->GetBinContent(i,j);
262 if (e < 0.0) continue; // don't include this cells
263 Float_t eta = xaxis->GetBinCenter(i);
264 Float_t phi = yaxis->GetBinCenter(j);
265 etCell[nCell] = e;
266 etaCell[nCell] = eta;
267 phiCell[nCell] = phi;
0ab34e91 268 flagCell[nCell] = 0; //default
70e58892 269 nCell++;
270 }
271 }
272
273 // Parameters from header
7d0f353c 274 Float_t minmove = header->GetMinMove();
275 Float_t maxmove = header->GetMaxMove();
276 Float_t rc = header->GetRadius();
277 Float_t etseed = header->GetEtSeed();
278 //Float_t etmin = header->GetMinJetEt();
70e58892 279
280
281
282 // tmp array of jets form algoritm
283 Float_t etaAlgoJet[30];
284 Float_t phiAlgoJet[30];
285 Float_t etAlgoJet[30];
286 Int_t ncellsAlgoJet[30];
287
288 //run algorithm//
289
290 // sort cells by et
291 Int_t * index = new Int_t[nCell];
292 TMath::Sort(nCell, etCell, index);
293 // variable used in centroide loop
9dda5307 294 Float_t eta = 0.0;
295 Float_t phi = 0.0;
296 Float_t eta0 = 0.0;
297 Float_t phi0 = 0.0;
298 Float_t etab = 0.0;
299 Float_t phib = 0.0;
300 Float_t etas = 0.0;
301 Float_t phis = 0.0;
302 Float_t ets = 0.0;
303 Float_t deta = 0.0;
304 Float_t dphi = 0.0;
305 Float_t dr = 0.0;
306 Float_t etsb = 0.0;
70e58892 307 Float_t etasb = 0.0;
308 Float_t phisb = 0.0;
9dda5307 309 Float_t dphib = 0.0;
310
70e58892 311
312 for(Int_t icell = 0; icell < nCell; icell++){
313 Int_t jcell = index[icell];
314 if(etCell[jcell] <= etseed) continue; // if cell energy is low et seed
315 if(flagCell[jcell] != 0) continue; // if cell was used before
316 eta = etaCell[jcell];
317 phi = phiCell[jcell];
318 eta0 = eta;
319 phi0 = phi;
320 etab = eta;
321 phib = phi;
322 ets = etCell[jcell];
323 etas = 0.0;
324 phis = 0.0;
325 etsb = ets;
326 etasb = 0.0;
327 phisb = 0.0;
328 for(Int_t kcell =0; kcell < nCell; kcell++){
329 Int_t lcell = index[kcell];
9dda5307 330 if(lcell == jcell) continue; // cell itself
331 if(flagCell[lcell] != 0) continue; // cell used before
332 if(etCell[lcell] > etCell[jcell]) continue; // can this happen
70e58892 333 //calculate dr
334 deta = etaCell[lcell] - eta;
9dda5307 335 dphi = TMath::Abs(phiCell[lcell] - phi);
336 if (dphi > TMath::Pi()) dphi = 2. * TMath::Pi() - dphi;
337 dr = TMath::Sqrt(deta * deta + dphi * dphi);
70e58892 338 if(dr <= rc){
339 // calculate offset from initiate cell
340 deta = etaCell[lcell] - eta0;
341 dphi = phiCell[lcell] - phi0;
9dda5307 342 if (dphi < - TMath::Pi()) dphi= dphi + 2.0 * TMath::Pi();
343 if (dphi > TMath::Pi()) dphi = dphi - 2.0 * TMath::Pi();
344
70e58892 345 etas = etas + etCell[lcell]*deta;
346 phis = phis + etCell[lcell]*dphi;
347 ets = ets + etCell[lcell];
348 //new weighted eta and phi including this cell
349 eta = eta0 + etas/ets;
350 phi = phi0 + phis/ets;
351 // if cone does not move much, just go to next step
9dda5307 352 dphib = TMath::Abs(phi - phib);
353 if (dphib > TMath::Pi()) dphib = 2. * TMath::Pi() - dphib;
354 dr = TMath::Sqrt((eta-etab)*(eta-etab) + dphib * dphib);
70e58892 355 if(dr <= minmove) break;
356 // cone should not move more than max_mov
357 dr = TMath::Sqrt((etas/ets)*(etas/ets) + (phis/ets)*(phis/ets));
358 if(dr > maxmove){
9dda5307 359 eta = etab;
360 phi = phib;
361 ets = etsb;
362 etas = etasb;
363 phis = phisb;
364 } else { // store this loop information
365 etab = eta;
366 phib = phi;
367 etsb = ets;
368 etasb = etas;
369 phisb = phis;
70e58892 370 }
9dda5307 371 } // inside cone
70e58892 372 }//end of cells loop looking centroide
373
374 //avoid cones overloap (to be implemented in the future)
375
376 //flag cells in Rc, estimate total energy in cone
377 Float_t etCone = 0.0;
378 Int_t nCellIn = 0;
7d0f353c 379 rc = header->GetRadius();
70e58892 380 for(Int_t ncell =0; ncell < nCell; ncell++){
381 if(flagCell[ncell] != 0) continue; // cell used before
382 //calculate dr
383 deta = etaCell[ncell] - eta;
384 dphi = phiCell[ncell] - phi;
385 if (dphi < -TMath::Pi()) dphi= -dphi - 2.0 * TMath::Pi();
386 if (dphi > TMath::Pi()) dphi = 2.0 * TMath::Pi() - dphi;
387 dr = TMath::Sqrt(deta * deta + dphi * dphi);
388 if(dr <= rc){ // cell in cone
389 flagCell[ncell] = -1;
390 etCone+=etCell[ncell];
391 nCellIn++;
392 }
393 }
394
395 // select jets with et > background
396 // estimate max fluctuation of background in cone
397 Double_t ncellin = (Double_t)nCellIn;
398 Double_t ntcell = (Double_t)nCell;
399 Double_t etbmax = (etbgTotal + dEtTotal )*(ncellin/ntcell);
400 // min cone et
401 Double_t etcmin = etCone ; // could be used etCone - etmin !!
402 //desicions !! etbmax < etcmin
403 for(Int_t mcell =0; mcell < nCell; mcell++){
404 if(flagCell[mcell] == -1){
405 if(etbmax < etcmin)
406 flagCell[mcell] = 1; //flag cell as used
407 else
408 flagCell[mcell] = 0; // leave it free
409 }
410 }
411 //store tmp jet info !!!
98e98c1c 412 if(etbmax < etcmin) {
70e58892 413 etaAlgoJet[nJets] = eta;
414 phiAlgoJet[nJets] = phi;
415 etAlgoJet[nJets] = etCone;
416 ncellsAlgoJet[nJets] = nCellIn;
417 nJets++;
418 }
419
420 } // end of cells loop
421
422 //reorder jets by et in cone
423 //sort jets by energy
424 Int_t * idx = new Int_t[nJets];
425 TMath::Sort(nJets, etAlgoJet, idx);
426 for(Int_t p = 0; p < nJets; p++){
427 etaJet[p] = etaAlgoJet[idx[p]];
428 phiJet[p] = phiAlgoJet[idx[p]];
429 etJet[p] = etAlgoJet[idx[p]];
430 etallJet[p] = etAlgoJet[idx[p]];
431 ncellsJet[p] = ncellsAlgoJet[idx[p]];
432 }
433
434
435 //delete
9dda5307 436 delete[] index;
437 delete[] idx;
70e58892 438
439}
440////////////////////////////////////////////////////////////////////////
441
442void AliUA1JetFinderV1::SubtractBackg(Int_t& nIn, Int_t&nJ, Float_t&etbgTotalN,
443 Float_t* ptT, Float_t* etaT, Float_t* phiT,
444 Float_t* etJet,Float_t* etaJet, Float_t* phiJet, Float_t* etsigJet,
445 Int_t* multJet, Int_t* injet)
446{
447 //background subtraction using cone method but without correction in dE/deta distribution
448
449 //calculate energy inside and outside cones
7d0f353c 450 AliUA1JetHeaderV1* header = (AliUA1JetHeaderV1*) fHeader;
451 Float_t rc= header->GetRadius();
70e58892 452 Float_t etIn[30];
453 Float_t etOut = 0;
454 for(Int_t jpart = 0; jpart < nIn; jpart++){ // loop for all particles in array
98e98c1c 455 // if((fReader->GetCutFlag(jpart)) != 1) continue; // pt cut
70e58892 456 for(Int_t ijet=0; ijet<nJ; ijet++){
457 Float_t deta = etaT[jpart] - etaJet[ijet];
458 Float_t dphi = phiT[jpart] - phiJet[ijet];
459 if (dphi < -TMath::Pi()) dphi= -dphi - 2.0 * TMath::Pi();
460 if (dphi > TMath::Pi()) dphi = 2.0 * TMath::Pi() - dphi;
461 Float_t dr = TMath::Sqrt(deta * deta + dphi * dphi);
462 if(dr <= rc){ // particles inside this cone
70e58892 463 multJet[ijet]++;
464 injet[jpart] = ijet;
98e98c1c 465 if((fReader->GetCutFlag(jpart)) == 1){ // pt cut
466 etIn[ijet] += ptT[jpart];
467 if(fReader->GetSignalFlag(jpart) == 1) etsigJet[ijet]+= ptT[jpart];
468 }
70e58892 469 break;
470 }
471 }// end jets loop
970a3bbc 472 if(injet[jpart] == -1 && fReader->GetCutFlag(jpart) == 1)
98e98c1c 473 etOut += ptT[jpart]; // particle outside cones and pt cut
70e58892 474 } //end particle loop
475
476 //estimate jets and background areas
477 Float_t areaJet[30];
7d0f353c 478 Float_t areaOut = 4*(header->GetLegoEtaMax())*TMath::Pi();
70e58892 479 for(Int_t k=0; k<nJ; k++){
480 Float_t detamax = etaJet[k] + rc;
481 Float_t detamin = etaJet[k] - rc;
482 Float_t accmax = 0.0; Float_t accmin = 0.0;
7d0f353c 483 if(detamax > header->GetLegoEtaMax()){ // sector outside etamax
484 Float_t h = header->GetLegoEtaMax() - etaJet[k];
70e58892 485 accmax = rc*rc*TMath::ACos(h/rc) - h*TMath::Sqrt(rc*rc - h*h);
486 }
7d0f353c 487 if(detamin < header->GetLegoEtaMin()){ // sector outside etamin
488 Float_t h = header->GetLegoEtaMax() + etaJet[k];
70e58892 489 accmin = rc*rc*TMath::ACos(h/rc) - h*TMath::Sqrt(rc*rc - h*h);
490 }
491 areaJet[k] = rc*rc*TMath::Pi() - accmax - accmin;
492 areaOut = areaOut - areaJet[k];
493 }
494 //subtract background using area method
495 for(Int_t ljet=0; ljet<nJ; ljet++){
496 Float_t areaRatio = areaJet[ljet]/areaOut;
497 etJet[ljet] = etIn[ljet]-etOut*areaRatio; // subtraction
498 }
499
500 // estimate new total background
7d0f353c 501 Float_t areaT = 4*(header->GetLegoEtaMax())*TMath::Pi();
70e58892 502 etbgTotalN = etOut*areaT/areaOut;
503
504
505}
506
507////////////////////////////////////////////////////////////////////////
508
509void AliUA1JetFinderV1::SubtractBackgStat(Int_t& nIn, Int_t&nJ,Float_t&etbgTotalN,
510 Float_t* ptT, Float_t* etaT, Float_t* phiT,
511 Float_t* etJet,Float_t* etaJet, Float_t* phiJet, Float_t* etsigJet,
512 Int_t* multJet, Int_t* injet)
513{
514
515 //background subtraction using statistical method
7d0f353c 516 AliUA1JetHeaderV1* header = (AliUA1JetHeaderV1*) fHeader;
517 Float_t etbgStat = header->GetBackgStat(); // pre-calculated background
70e58892 518
519 //calculate energy inside
7d0f353c 520 Float_t rc= header->GetRadius();
70e58892 521 Float_t etIn[30];
522
523 for(Int_t jpart = 0; jpart < nIn; jpart++){ // loop for all particles in array
98e98c1c 524 //if((fReader->GetCutFlag(jpart)) != 1) continue; // pt cut
70e58892 525 for(Int_t ijet=0; ijet<nJ; ijet++){
526 Float_t deta = etaT[jpart] - etaJet[ijet];
527 Float_t dphi = phiT[jpart] - phiJet[ijet];
528 if (dphi < -TMath::Pi()) dphi= -dphi - 2.0 * TMath::Pi();
529 if (dphi > TMath::Pi()) dphi = 2.0 * TMath::Pi() - dphi;
530 Float_t dr = TMath::Sqrt(deta * deta + dphi * dphi);
531 if(dr <= rc){ // particles inside this cone
70e58892 532 multJet[ijet]++;
533 injet[jpart] = ijet;
98e98c1c 534 if((fReader->GetCutFlag(jpart)) == 1){ // pt cut
535 etIn[ijet]+= ptT[jpart];
536 if(fReader->GetSignalFlag(jpart) == 1) etsigJet[ijet] += ptT[jpart];
537 }
70e58892 538 break;
539 }
540 }// end jets loop
541 } //end particle loop
542
543 //calc jets areas
544 Float_t areaJet[30];
7d0f353c 545 Float_t areaOut = 4*(header->GetLegoEtaMax())*TMath::Pi();
70e58892 546 for(Int_t k=0; k<nJ; k++){
547 Float_t detamax = etaJet[k] + rc;
548 Float_t detamin = etaJet[k] - rc;
549 Float_t accmax = 0.0; Float_t accmin = 0.0;
7d0f353c 550 if(detamax > header->GetLegoEtaMax()){ // sector outside etamax
551 Float_t h = header->GetLegoEtaMax() - etaJet[k];
70e58892 552 accmax = rc*rc*TMath::ACos(h/rc) - h*TMath::Sqrt(rc*rc - h*h);
553 }
7d0f353c 554 if(detamin < header->GetLegoEtaMin()){ // sector outside etamin
555 Float_t h = header->GetLegoEtaMax() + etaJet[k];
70e58892 556 accmin = rc*rc*TMath::ACos(h/rc) - h*TMath::Sqrt(rc*rc - h*h);
557 }
558 areaJet[k] = rc*rc*TMath::Pi() - accmax - accmin;
559 }
560
561 //subtract background using area method
562 for(Int_t ljet=0; ljet<nJ; ljet++){
563 Float_t areaRatio = areaJet[ljet]/areaOut;
564 etJet[ljet] = etIn[ljet]-etbgStat*areaRatio; // subtraction
565 }
566
567 etbgTotalN = etbgStat;
568
569}
570
571////////////////////////////////////////////////////////////////////////
572
573void AliUA1JetFinderV1::SubtractBackgCone(Int_t& nIn, Int_t&nJ,Float_t& etbgTotalN,
574 Float_t* ptT, Float_t* etaT, Float_t* phiT,
575 Float_t* etJet,Float_t* etaJet, Float_t* phiJet, Float_t* etsigJet,
576 Int_t* multJet, Int_t* injet)
577{
578 // Cone background subtraction method taking into acount dEt/deta distribution
7d0f353c 579 AliUA1JetHeaderV1* header = (AliUA1JetHeaderV1*) fHeader;
70e58892 580 //general
7d0f353c 581 Float_t rc= header->GetRadius();
582 Float_t etamax = header->GetLegoEtaMax();
583 Float_t etamin = header->GetLegoEtaMin();
70e58892 584 Int_t ndiv = 100;
585
586 // jet energy and area arrays
587 TH1F* hEtJet[30];
588 TH1F* hAreaJet[30];
589 for(Int_t mjet=0; mjet<nJ; mjet++){
590 char hEtname[256]; char hAreaname[256];
591 sprintf(hEtname, "hEtJet%d", mjet); sprintf(hAreaname, "hAreaJet%d", mjet);
592 hEtJet[mjet] = new TH1F(hEtname,"et dist in eta ",ndiv,etamin,etamax);
593 hAreaJet[mjet] = new TH1F(hAreaname,"area dist in eta ",ndiv,etamin,etamax);
594 }
595 // background energy and area
596 TH1F* hEtBackg = new TH1F("hEtBackg"," backg et dist in eta ",ndiv,etamin,etamax);
597 TH1F* hAreaBackg = new TH1F("hAreaBackg","backg area dist in eta ",ndiv,etamin,etamax);
598
599 //fill energies
600 for(Int_t jpart = 0; jpart < nIn; jpart++){ // loop for all particles in array
70e58892 601 for(Int_t ijet=0; ijet<nJ; ijet++){ // loop for all jets
602 Float_t deta = etaT[jpart] - etaJet[ijet];
98e98c1c 603 Float_t dphi = phiT[jpart] - phiJet[ijet];
70e58892 604 if (dphi < -TMath::Pi()) dphi= -dphi - 2.0 * TMath::Pi();
98e98c1c 605 if (dphi > TMath::Pi()) dphi = 2.0 * TMath::Pi() - dphi;
606 Float_t dr = TMath::Sqrt(deta * deta + dphi * dphi);
70e58892 607 if(dr <= rc){ // particles inside this cone
70e58892 608 injet[jpart] = ijet;
98e98c1c 609 multJet[ijet]++;
610 if((fReader->GetCutFlag(jpart)) == 1){// pt cut
611 hEtJet[ijet]->Fill(etaT[jpart],ptT[jpart]); //particle inside cone
612 if(fReader->GetSignalFlag(jpart) == 1) etsigJet[ijet] += ptT[jpart];
613 }
70e58892 614 break;
615 }
616 }// end jets loop
970a3bbc 617 if(injet[jpart] == -1 && fReader->GetCutFlag(jpart) == 1)
98e98c1c 618 hEtBackg->Fill(etaT[jpart],ptT[jpart]); // particle outside cones
70e58892 619 } //end particle loop
620
621 //calc areas
622 Float_t eta0 = etamin;
623 Float_t etaw = (etamax - etamin)/((Float_t)ndiv);
624 Float_t eta1 = eta0 + etaw;
625 for(Int_t etabin = 0; etabin< ndiv; etabin++){ // loop for all eta bins
626 Float_t etac = eta0 + etaw/2.0;
627 Float_t areabg = etaw*2.0*TMath::Pi();
628 for(Int_t ijet=0; ijet<nJ; ijet++){ // loop for all jets
629 Float_t deta0 = TMath::Abs(eta0 - etaJet[ijet]);
630 Float_t deta1 = TMath::Abs(eta1 - etaJet[ijet]);
631 Float_t acc0 = 0.0; Float_t acc1 = 0.0;
632 Float_t areaj = 0.0;
633 if(deta0 > rc && deta1 < rc){
634 acc1 = rc*rc*TMath::ACos(deta1/rc) - deta1*TMath::Sqrt(rc*rc - deta1*deta1);
635 areaj = acc1;
636 }
637 if(deta0 < rc && deta1 > rc){
638 acc0 = rc*rc*TMath::ACos(deta0/rc) - deta0*TMath::Sqrt(rc*rc - deta0*deta0);
639 areaj = acc0;
640 }
641 if(deta0 < rc && deta1 < rc){
642 acc0 = rc*rc*TMath::ACos(deta0/rc) - deta0*TMath::Sqrt(rc*rc - deta0*deta0);
643 acc1 = rc*rc*TMath::ACos(deta1/rc) - deta1*TMath::Sqrt(rc*rc - deta1*deta1);
644 if(eta1<etaJet[ijet]) areaj = acc1-acc0; // case 1
645 if((eta0 < etaJet[ijet]) && (etaJet[ijet]<eta1)) areaj = rc*rc*TMath::Pi() - acc1 -acc0; // case 2
646 if(etaJet[ijet] < eta0) areaj = acc0 -acc1; // case 3
647 }
648 hAreaJet[ijet]->Fill(etac,areaj);
649 areabg = areabg - areaj;
650 } // end jets loop
651 hAreaBackg->Fill(etac,areabg);
652 eta0 = eta1;
653 eta1 = eta1 + etaw;
654 } // end loop for all eta bins
655
656 //subtract background
657 for(Int_t kjet=0; kjet<nJ; kjet++){
658 etJet[kjet] = 0.0; // first clear etJet for this jet
659 for(Int_t bin = 0; bin< ndiv; bin++){
660 if(hAreaJet[kjet]->GetBinContent(bin)){
661 Float_t areab = hAreaBackg->GetBinContent(bin);
662 Float_t etb = hEtBackg->GetBinContent(bin);
663 Float_t areaR = (hAreaJet[kjet]->GetBinContent(bin))/areab;
664 etJet[kjet] = etJet[kjet] + ((hEtJet[kjet]->GetBinContent(bin)) - etb*areaR); //subtraction
665 }
666 }
667 }
668
669 // calc background total
670 Double_t etOut = hEtBackg->Integral();
671 Double_t areaOut = hAreaBackg->Integral();
7d0f353c 672 Float_t areaT = 4*(header->GetLegoEtaMax())*TMath::Pi();
70e58892 673 etbgTotalN = etOut*areaT/areaOut;
674
675 //delete
676 for(Int_t ljet=0; ljet<nJ; ljet++){ // loop for all jets
677 delete hEtJet[ljet];
678 delete hAreaJet[ljet];
679 }
680
681 delete hEtBackg;
682 delete hAreaBackg;
683}
684
685////////////////////////////////////////////////////////////////////////
686
687
688void AliUA1JetFinderV1::SubtractBackgRatio(Int_t& nIn, Int_t&nJ,Float_t& etbgTotalN,
689 Float_t* ptT, Float_t* etaT, Float_t* phiT,
690 Float_t* etJet,Float_t* etaJet, Float_t* phiJet, Float_t* etsigJet,
691 Int_t* multJet, Int_t* injet)
692{
693 // Ratio background subtraction method taking into acount dEt/deta distribution
7d0f353c 694 AliUA1JetHeaderV1* header = (AliUA1JetHeaderV1*) fHeader;
70e58892 695 //factor F calc before
7d0f353c 696 Float_t bgRatioCut = header->GetBackgCutRatio();
70e58892 697
698
699 //general
7d0f353c 700 Float_t rc= header->GetRadius();
701 Float_t etamax = header->GetLegoEtaMax();
702 Float_t etamin = header->GetLegoEtaMin();
70e58892 703 Int_t ndiv = 100;
704
705 // jet energy and area arrays
706 TH1F* hEtJet[30];
707 TH1F* hAreaJet[30];
708 for(Int_t mjet=0; mjet<nJ; mjet++){
709 char hEtname[256]; char hAreaname[256];
710 sprintf(hEtname, "hEtJet%d", mjet); sprintf(hAreaname, "hAreaJet%d", mjet);
711 hEtJet[mjet] = new TH1F(hEtname,"et dist in eta ",ndiv,etamin,etamax); // change range
712 hAreaJet[mjet] = new TH1F(hAreaname,"area dist in eta ",ndiv,etamin,etamax); // change range
713 }
714 // background energy and area
715 TH1F* hEtBackg = new TH1F("hEtBackg"," backg et dist in eta ",ndiv,etamin,etamax); // change range
716 TH1F* hAreaBackg = new TH1F("hAreaBackg","backg area dist in eta ",ndiv,etamin,etamax); // change range
717
718 //fill energies
719 for(Int_t jpart = 0; jpart < nIn; jpart++){ // loop for all particles in array
98e98c1c 720 //if((fReader->GetCutFlag(jpart)) != 1) continue;
70e58892 721 for(Int_t ijet=0; ijet<nJ; ijet++){ // loop for all jets
722 Float_t deta = etaT[jpart] - etaJet[ijet];
723 Float_t dphi = phiT[jpart] - phiJet[ijet];
724 if (dphi < -TMath::Pi()) dphi= -dphi - 2.0 * TMath::Pi();
725 if (dphi > TMath::Pi()) dphi = 2.0 * TMath::Pi() - dphi;
726 Float_t dr = TMath::Sqrt(deta * deta + dphi * dphi);
727 if(dr <= rc){ // particles inside this cone
70e58892 728 multJet[ijet]++;
729 injet[jpart] = ijet;
98e98c1c 730 if((fReader->GetCutFlag(jpart)) == 1){ //pt cut
731 hEtJet[ijet]->Fill(etaT[jpart],ptT[jpart]); //particle inside cone and pt cut
732 if(fReader->GetSignalFlag(jpart) == 1) etsigJet[ijet] += ptT[jpart];
733 }
70e58892 734 break;
735 }
736 }// end jets loop
98e98c1c 737 if(injet[jpart] == -1) hEtBackg->Fill(etaT[jpart],ptT[jpart]); // particle outside cones
70e58892 738 } //end particle loop
739
740 //calc areas
741 Float_t eta0 = etamin;
742 Float_t etaw = (etamax - etamin)/((Float_t)ndiv);
743 Float_t eta1 = eta0 + etaw;
744 for(Int_t etabin = 0; etabin< ndiv; etabin++){ // loop for all eta bins
745 Float_t etac = eta0 + etaw/2.0;
746 Float_t areabg = etaw*2.0*TMath::Pi();
747 for(Int_t ijet=0; ijet<nJ; ijet++){ // loop for all jets
748 Float_t deta0 = TMath::Abs(eta0 - etaJet[ijet]);
749 Float_t deta1 = TMath::Abs(eta1 - etaJet[ijet]);
750 Float_t acc0 = 0.0; Float_t acc1 = 0.0;
751 Float_t areaj = 0.0;
752 if(deta0 > rc && deta1 < rc){
753 acc1 = rc*rc*TMath::ACos(deta1/rc) - deta1*TMath::Sqrt(rc*rc - deta1*deta1);
754 areaj = acc1;
755 }
756 if(deta0 < rc && deta1 > rc){
757 acc0 = rc*rc*TMath::ACos(deta0/rc) - deta0*TMath::Sqrt(rc*rc - deta0*deta0);
758 areaj = acc0;
759 }
760 if(deta0 < rc && deta1 < rc){
761 acc0 = rc*rc*TMath::ACos(deta0/rc) - deta0*TMath::Sqrt(rc*rc - deta0*deta0);
762 acc1 = rc*rc*TMath::ACos(deta1/rc) - deta1*TMath::Sqrt(rc*rc - deta1*deta1);
763 if(eta1<etaJet[ijet]) areaj = acc1-acc0; // case 1
764 if((eta0 < etaJet[ijet]) && (etaJet[ijet]<eta1)) areaj = rc*rc*TMath::Pi() - acc1 -acc0; // case 2
765 if(etaJet[ijet] < eta0) areaj = acc0 -acc1; // case 3
766 }
767 hAreaJet[ijet]->Fill(etac,areaj);
768 areabg = areabg - areaj;
769 } // end jets loop
770 hAreaBackg->Fill(etac,areabg);
771 eta0 = eta1;
772 eta1 = eta1 + etaw;
773 } // end loop for all eta bins
774
775 //subtract background
776 for(Int_t kjet=0; kjet<nJ; kjet++){
777 etJet[kjet] = 0.0; // first clear etJet for this jet
778 for(Int_t bin = 0; bin< ndiv; bin++){
779 if(hAreaJet[kjet]->GetBinContent(bin)){
780 Float_t areab = hAreaBackg->GetBinContent(bin);
781 Float_t etb = hEtBackg->GetBinContent(bin);
782 Float_t areaR = (hAreaJet[kjet]->GetBinContent(bin))/areab;
783 etJet[kjet] = etJet[kjet] + ((hEtJet[kjet]->GetBinContent(bin)) - etb*areaR*bgRatioCut); //subtraction
784 }
785 }
786 }
787
788 // calc background total
789 Double_t etOut = hEtBackg->Integral();
790 Double_t areaOut = hAreaBackg->Integral();
7d0f353c 791 Float_t areaT = 4*(header->GetLegoEtaMax())*TMath::Pi();
70e58892 792 etbgTotalN = etOut*areaT/areaOut;
793
794 //delete
795 for(Int_t ljet=0; ljet<nJ; ljet++){ // loop for all jets
796 delete hEtJet[ljet];
797 delete hAreaJet[ljet];
798 }
799
800 delete hEtBackg;
801 delete hAreaBackg;
802}
803
804////////////////////////////////////////////////////////////////////////
805
806
807void AliUA1JetFinderV1::Reset()
808{
809 fLego->Reset();
810 fJets->ClearJets();
ad8ada26 811 AliJetFinder::Reset();
70e58892 812}
813
814////////////////////////////////////////////////////////////////////////
815
816void AliUA1JetFinderV1::WriteJHeaderToFile()
817{
7d0f353c 818 AliUA1JetHeaderV1* header = (AliUA1JetHeaderV1*) fHeader;
7d0f353c 819 header->Write();
70e58892 820}
821
822////////////////////////////////////////////////////////////////////////
823
824void AliUA1JetFinderV1::Init()
825{
826 // initializes some variables
7d0f353c 827 AliUA1JetHeaderV1* header = (AliUA1JetHeaderV1*) fHeader;
70e58892 828 // book lego
829 fLego = new
830 TH2F("legoH","eta-phi",
7d0f353c 831 header->GetLegoNbinEta(), header->GetLegoEtaMin(),
832 header->GetLegoEtaMax(), header->GetLegoNbinPhi(),
833 header->GetLegoPhiMin(), header->GetLegoPhiMax());
70e58892 834
9dda5307 835
70e58892 836}