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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
70e58892 16
17//---------------------------------------------------------------------
18// UA1 Cone Algorithm Jet finder
19// manages the search for jets
20// Author: Rafael.Diaz.Valdes@cern.ch
21// (version in c++)
22//---------------------------------------------------------------------
23
24#include <TLorentzVector.h>
25#include <TFile.h>
26#include <TH1F.h>
27#include <TH2F.h>
28#include <TArrayF.h>
29#include "AliUA1JetFinderV1.h"
30#include "AliUA1JetHeaderV1.h"
31#include "AliJetReaderHeader.h"
32#include "AliJetReader.h"
33#include "AliJet.h"
34
35
36ClassImp(AliUA1JetFinderV1)
37
38////////////////////////////////////////////////////////////////////////
39
98e98c1c 40AliUA1JetFinderV1::AliUA1JetFinderV1()
1b7d5d7e 41
98e98c1c 42{
43 // Constructor
44 fHeader = 0x0;
45 fLego = 0x0;
70e58892 46}
47
48////////////////////////////////////////////////////////////////////////
49
50AliUA1JetFinderV1::~AliUA1JetFinderV1()
51
52{
53 // destructor
54}
55
56////////////////////////////////////////////////////////////////////////
57
58
59void AliUA1JetFinderV1::FindJets()
60
61{
62 //1) Fill cell map array
63 //2) calculate total energy and fluctuation level
64 //3) Run algorithm
65 // 3.1) look centroides in cell map
66 // 3.2) calculate total energy in cones
67 // 3.3) flag as a possible jet
68 // 3.4) reorder cones by energy
69 //4) subtract backg in accepted jets
70 //5) fill AliJet list
71
72 // transform input to pt,eta,phi plus lego
7d0f353c 73
74 AliUA1JetHeaderV1* header = (AliUA1JetHeaderV1*) fHeader;
70e58892 75 TClonesArray *lvArray = fReader->GetMomentumArray();
76 Int_t nIn = lvArray->GetEntries();
77 if (nIn == 0) return;
78
79 // local arrays for input
80 Float_t* ptT = new Float_t[nIn];
81 Float_t* etaT = new Float_t[nIn];
82 Float_t* phiT = new Float_t[nIn];
83 Int_t* injet = new Int_t[nIn];
84
85 //total energy in array
86 Float_t etbgTotal = 0.0;
87 TH1F* hPtTotal = new TH1F("hPt","Pt distribution of all particles ",100,0.0,15.0);
88
89 // load input vectors and calculate total energy in array
90 for (Int_t i = 0; i < nIn; i++){
91 TLorentzVector *lv = (TLorentzVector*) lvArray->At(i);
92 ptT[i] = lv->Pt();
93 etaT[i] = lv->Eta();
94 phiT[i] = ((lv->Phi() < 0) ? (lv->Phi()) + 2 * TMath::Pi() : lv->Phi());
95 if (fReader->GetCutFlag(i) != 1) continue;
96 fLego->Fill(etaT[i], phiT[i], ptT[i]);
97 hPtTotal->Fill(ptT[i]);
98 etbgTotal+= ptT[i];
99 }
100 fJets->SetNinput(nIn);
101
102 // calculate total energy and fluctuation in map
103 Double_t meanpt = hPtTotal->GetMean();
104 Double_t ptRMS = hPtTotal->GetRMS();
105 Double_t npart = hPtTotal->GetEntries();
106 Double_t dEtTotal = (TMath::Sqrt(npart))*TMath::Sqrt(meanpt * meanpt + ptRMS*ptRMS);
107
108 // arrays to hold jets
109 Float_t* etaJet = new Float_t[30];
110 Float_t* phiJet = new Float_t[30];
111 Float_t* etJet = new Float_t[30];
112 Float_t* etsigJet = new Float_t[30]; //signal et in jet
113 Float_t* etallJet = new Float_t[30]; // total et in jet (tmp variable)
114 Int_t* ncellsJet = new Int_t[30];
115 Int_t* multJet = new Int_t[30];
116 Int_t nJets; // to hold number of jets found by algorithm
117 Int_t nj; // number of jets accepted
7d0f353c 118 Float_t prec = header->GetPrecBg();
70e58892 119 Float_t bgprec = 1;
120 while(bgprec > prec){
121 //reset jet arrays in memory
122 memset(etaJet,0,sizeof(Float_t)*30);
123 memset(phiJet,0,sizeof(Float_t)*30);
124 memset(etJet,0,sizeof(Float_t)*30);
125 memset(etallJet,0,sizeof(Float_t)*30);
126 memset(etsigJet,0,sizeof(Float_t)*30);
127 memset(ncellsJet,0,sizeof(Int_t)*30);
128 memset(multJet,0,sizeof(Int_t)*30);
129 nJets = 0;
130 nj = 0;
131 // reset particles-jet array in memory
98e98c1c 132 memset(injet,-1,sizeof(Int_t)*nIn);
70e58892 133 //run cone algorithm finder
134 RunAlgoritm(etbgTotal,dEtTotal,nJets,etJet,etaJet,phiJet,etallJet,ncellsJet);
135 //run background subtraction
7d0f353c 136 if(nJets > header->GetNAcceptJets()) // limited number of accepted jets per event
137 nj = header->GetNAcceptJets();
70e58892 138 else
139 nj = nJets;
140 //subtract background
141 Float_t etbgTotalN = 0.0; //new background
7d0f353c 142 if(header->GetBackgMode() == 1) // standar
70e58892 143 SubtractBackg(nIn,nj,etbgTotalN,ptT,etaT,phiT,etJet,etaJet,phiJet,etsigJet,multJet,injet);
7d0f353c 144 if(header->GetBackgMode() == 2) //cone
70e58892 145 SubtractBackgCone(nIn,nj,etbgTotalN,ptT,etaT,phiT,etJet,etaJet,phiJet,etsigJet,multJet,injet);
7d0f353c 146 if(header->GetBackgMode() == 3) //ratio
70e58892 147 SubtractBackgRatio(nIn,nj,etbgTotalN,ptT,etaT,phiT,etJet,etaJet,phiJet,etsigJet,multJet,injet);
7d0f353c 148 if(header->GetBackgMode() == 4) //statistic
70e58892 149 SubtractBackgStat(nIn,nj,etbgTotalN,ptT,etaT,phiT,etJet,etaJet,phiJet,etsigJet,multJet,injet);
150 //calc precision
151 if(etbgTotalN != 0.0)
152 bgprec = (etbgTotal - etbgTotalN)/etbgTotalN;
153 else
154 bgprec = 0;
155 etbgTotal = etbgTotalN; // update with new background estimation
156 } //end while
157
158 // add jets to list
159 Int_t* idxjets = new Int_t[nj];
160 Int_t nselectj = 0;
161 for(Int_t kj=0; kj<nj; kj++){
7d0f353c 162 if ((etaJet[kj] > (header->GetJetEtaMax())) ||
163 (etaJet[kj] < (header->GetJetEtaMin())) ||
164 (etJet[kj] < header->GetMinJetEt())) continue; // acceptance eta range and etmin
70e58892 165 Float_t px, py,pz,en; // convert to 4-vector
166 px = etJet[kj] * TMath::Cos(phiJet[kj]);
167 py = etJet[kj] * TMath::Sin(phiJet[kj]);
168 pz = etJet[kj] / TMath::Tan(2.0 * TMath::ATan(TMath::Exp(-etaJet[kj])));
169 en = TMath::Sqrt(px * px + py * py + pz * pz);
170 fJets->AddJet(px, py, pz, en);
171 idxjets[nselectj] = kj;
172 nselectj++;
70e58892 173 }
174 //add signal percentage and total signal in AliJets for analysis tool
175 Float_t* percentage = new Float_t[nselectj];
176 Int_t* ncells = new Int_t[nselectj];
177 Int_t* mult = new Int_t[nselectj];
70e58892 178 for(Int_t i = 0; i< nselectj; i++){
179 percentage[i] = etsigJet[idxjets[i]]/etJet[idxjets[i]];
180 ncells[i] = ncellsJet[idxjets[i]];
181 mult[i] = multJet[idxjets[i]];
182 }
98e98c1c 183 //add particle-injet relationship ///
184 for(Int_t bj = 0; bj < nIn; bj++){
185 if(injet[bj] == -1) continue; //background particle
186 Int_t bflag = 0;
187 for(Int_t ci = 0; ci< nselectj; ci++){
188 if(injet[bj] == idxjets[ci]){
189 injet[bj]= ci;
190 bflag++;
191 break;
192 }
193 }
194 if(bflag == 0) injet[bj] = -1; // set as background particle
195 }
70e58892 196 fJets->SetNCells(ncells);
197 fJets->SetPtFromSignal(percentage);
198 fJets->SetMultiplicities(mult);
199 fJets->SetInJet(injet);
200 fJets->SetEtaIn(etaT);
201 fJets->SetPhiIn(phiT);
202 fJets->SetPtIn(ptT);
7d0f353c 203 fJets->SetEtAvg(etbgTotal/(4*(header->GetLegoEtaMax())*TMath::Pi()));
70e58892 204
205
206 //delete
207 delete ptT;
208 delete etaT;
209 delete phiT;
210 delete injet;
211 delete hPtTotal;
212 delete etaJet;
213 delete phiJet;
214 delete etJet;
215 delete etsigJet;
216 delete etallJet;
217 delete ncellsJet;
218 delete multJet;
219 delete idxjets;
220 delete percentage;
221 delete ncells;
222 delete mult;
223
224
225}
226
227////////////////////////////////////////////////////////////////////////
228
229void AliUA1JetFinderV1::RunAlgoritm(Float_t etbgTotal, Double_t dEtTotal, Int_t& nJets,
230 Float_t* etJet,Float_t* etaJet, Float_t* phiJet,
231 Float_t* etallJet, Int_t* ncellsJet)
232{
233
234 //dump lego
235 // check enough space! *to be done*
7d0f353c 236 AliUA1JetHeaderV1* header = (AliUA1JetHeaderV1*) fHeader;
70e58892 237 Float_t etCell[60000]; //! Cell Energy
238 Float_t etaCell[60000]; //! Cell eta
239 Float_t phiCell[60000]; //! Cell phi
240 Int_t flagCell[60000]; //! Cell flag
241
242 Int_t nCell = 0;
243 TAxis* xaxis = fLego->GetXaxis();
244 TAxis* yaxis = fLego->GetYaxis();
245 Float_t e = 0.0;
7d0f353c 246 for (Int_t i = 1; i <= header->GetLegoNbinEta(); i++) {
247 for (Int_t j = 1; j <= header->GetLegoNbinPhi(); j++) {
70e58892 248 e = fLego->GetBinContent(i,j);
249 if (e < 0.0) continue; // don't include this cells
250 Float_t eta = xaxis->GetBinCenter(i);
251 Float_t phi = yaxis->GetBinCenter(j);
252 etCell[nCell] = e;
253 etaCell[nCell] = eta;
254 phiCell[nCell] = phi;
255 flagCell[nCell] = 0; //default
256 nCell++;
257 }
258 }
259
260 // Parameters from header
7d0f353c 261 Float_t minmove = header->GetMinMove();
262 Float_t maxmove = header->GetMaxMove();
263 Float_t rc = header->GetRadius();
264 Float_t etseed = header->GetEtSeed();
265 //Float_t etmin = header->GetMinJetEt();
70e58892 266
267
268
269 // tmp array of jets form algoritm
270 Float_t etaAlgoJet[30];
271 Float_t phiAlgoJet[30];
272 Float_t etAlgoJet[30];
273 Int_t ncellsAlgoJet[30];
274
275 //run algorithm//
276
277 // sort cells by et
278 Int_t * index = new Int_t[nCell];
279 TMath::Sort(nCell, etCell, index);
280 // variable used in centroide loop
281 Float_t eta = 0.0;
282 Float_t phi = 0.0;
283 Float_t eta0 = 0.0;
284 Float_t phi0 = 0.0;
285 Float_t etab = 0.0;
286 Float_t phib = 0.0;
287 Float_t etas = 0.0;
288 Float_t phis = 0.0;
289 Float_t ets = 0.0;
290 Float_t deta = 0.0;
291 Float_t dphi = 0.0;
292 Float_t dr = 0.0;
293 Float_t etsb = 0.0;
294 Float_t etasb = 0.0;
295 Float_t phisb = 0.0;
296
297
298 for(Int_t icell = 0; icell < nCell; icell++){
299 Int_t jcell = index[icell];
300 if(etCell[jcell] <= etseed) continue; // if cell energy is low et seed
301 if(flagCell[jcell] != 0) continue; // if cell was used before
302 eta = etaCell[jcell];
303 phi = phiCell[jcell];
304 eta0 = eta;
305 phi0 = phi;
306 etab = eta;
307 phib = phi;
308 ets = etCell[jcell];
309 etas = 0.0;
310 phis = 0.0;
311 etsb = ets;
312 etasb = 0.0;
313 phisb = 0.0;
314 for(Int_t kcell =0; kcell < nCell; kcell++){
315 Int_t lcell = index[kcell];
316 if(lcell == jcell) continue; // cell itself
317 if(flagCell[lcell] != 0) continue; // cell used before
318 if(etCell[lcell] > etCell[jcell]) continue;
319 //calculate dr
320 deta = etaCell[lcell] - eta;
321 dphi = phiCell[lcell] - phi;
322 if (dphi < -TMath::Pi()) dphi= -dphi - 2.0 * TMath::Pi();
323 if (dphi > TMath::Pi()) dphi = 2.0 * TMath::Pi() - dphi;
324 dr = TMath::Sqrt(deta * deta + dphi * dphi);
325 if(dr <= rc){
326 // calculate offset from initiate cell
327 deta = etaCell[lcell] - eta0;
328 dphi = phiCell[lcell] - phi0;
329 if (dphi < -TMath::Pi()) dphi= -dphi - 2.0 * TMath::Pi();
330 if (dphi > TMath::Pi()) dphi = 2.0 * TMath::Pi() - dphi;
331 etas = etas + etCell[lcell]*deta;
332 phis = phis + etCell[lcell]*dphi;
333 ets = ets + etCell[lcell];
334 //new weighted eta and phi including this cell
335 eta = eta0 + etas/ets;
336 phi = phi0 + phis/ets;
337 // if cone does not move much, just go to next step
338 dr = TMath::Sqrt((eta-etab)*(eta-etab) + (phi-phib)*(phi-phib));
339 if(dr <= minmove) break;
340 // cone should not move more than max_mov
341 dr = TMath::Sqrt((etas/ets)*(etas/ets) + (phis/ets)*(phis/ets));
342 if(dr > maxmove){
343 eta = etab;
344 phi = phib;
345 ets = etsb;
346 etas = etasb;
347 phis = phisb;
348 }else{ // store this loop information
349 etab=eta;
350 phib=phi;
351 etsb = ets;
352 etasb = etas;
353 phisb = phis;
354 }
355 }
356 }//end of cells loop looking centroide
357
358 //avoid cones overloap (to be implemented in the future)
359
360 //flag cells in Rc, estimate total energy in cone
361 Float_t etCone = 0.0;
362 Int_t nCellIn = 0;
7d0f353c 363 rc = header->GetRadius();
70e58892 364 for(Int_t ncell =0; ncell < nCell; ncell++){
365 if(flagCell[ncell] != 0) continue; // cell used before
366 //calculate dr
367 deta = etaCell[ncell] - eta;
368 dphi = phiCell[ncell] - phi;
369 if (dphi < -TMath::Pi()) dphi= -dphi - 2.0 * TMath::Pi();
370 if (dphi > TMath::Pi()) dphi = 2.0 * TMath::Pi() - dphi;
371 dr = TMath::Sqrt(deta * deta + dphi * dphi);
372 if(dr <= rc){ // cell in cone
373 flagCell[ncell] = -1;
374 etCone+=etCell[ncell];
375 nCellIn++;
376 }
377 }
378
379 // select jets with et > background
380 // estimate max fluctuation of background in cone
381 Double_t ncellin = (Double_t)nCellIn;
382 Double_t ntcell = (Double_t)nCell;
383 Double_t etbmax = (etbgTotal + dEtTotal )*(ncellin/ntcell);
384 // min cone et
385 Double_t etcmin = etCone ; // could be used etCone - etmin !!
386 //desicions !! etbmax < etcmin
387 for(Int_t mcell =0; mcell < nCell; mcell++){
388 if(flagCell[mcell] == -1){
389 if(etbmax < etcmin)
390 flagCell[mcell] = 1; //flag cell as used
391 else
392 flagCell[mcell] = 0; // leave it free
393 }
394 }
395 //store tmp jet info !!!
98e98c1c 396 if(etbmax < etcmin) {
70e58892 397 etaAlgoJet[nJets] = eta;
398 phiAlgoJet[nJets] = phi;
399 etAlgoJet[nJets] = etCone;
400 ncellsAlgoJet[nJets] = nCellIn;
401 nJets++;
402 }
403
404 } // end of cells loop
405
406 //reorder jets by et in cone
407 //sort jets by energy
408 Int_t * idx = new Int_t[nJets];
409 TMath::Sort(nJets, etAlgoJet, idx);
410 for(Int_t p = 0; p < nJets; p++){
411 etaJet[p] = etaAlgoJet[idx[p]];
412 phiJet[p] = phiAlgoJet[idx[p]];
413 etJet[p] = etAlgoJet[idx[p]];
414 etallJet[p] = etAlgoJet[idx[p]];
415 ncellsJet[p] = ncellsAlgoJet[idx[p]];
416 }
417
418
419 //delete
420 delete index;
421 delete idx;
422
423}
424////////////////////////////////////////////////////////////////////////
425
426void AliUA1JetFinderV1::SubtractBackg(Int_t& nIn, Int_t&nJ, Float_t&etbgTotalN,
427 Float_t* ptT, Float_t* etaT, Float_t* phiT,
428 Float_t* etJet,Float_t* etaJet, Float_t* phiJet, Float_t* etsigJet,
429 Int_t* multJet, Int_t* injet)
430{
431 //background subtraction using cone method but without correction in dE/deta distribution
432
433 //calculate energy inside and outside cones
7d0f353c 434 AliUA1JetHeaderV1* header = (AliUA1JetHeaderV1*) fHeader;
435 Float_t rc= header->GetRadius();
70e58892 436 Float_t etIn[30];
437 Float_t etOut = 0;
438 for(Int_t jpart = 0; jpart < nIn; jpart++){ // loop for all particles in array
98e98c1c 439 // if((fReader->GetCutFlag(jpart)) != 1) continue; // pt cut
70e58892 440 for(Int_t ijet=0; ijet<nJ; ijet++){
441 Float_t deta = etaT[jpart] - etaJet[ijet];
442 Float_t dphi = phiT[jpart] - phiJet[ijet];
443 if (dphi < -TMath::Pi()) dphi= -dphi - 2.0 * TMath::Pi();
444 if (dphi > TMath::Pi()) dphi = 2.0 * TMath::Pi() - dphi;
445 Float_t dr = TMath::Sqrt(deta * deta + dphi * dphi);
446 if(dr <= rc){ // particles inside this cone
70e58892 447 multJet[ijet]++;
448 injet[jpart] = ijet;
98e98c1c 449 if((fReader->GetCutFlag(jpart)) == 1){ // pt cut
450 etIn[ijet] += ptT[jpart];
451 if(fReader->GetSignalFlag(jpart) == 1) etsigJet[ijet]+= ptT[jpart];
452 }
70e58892 453 break;
454 }
455 }// end jets loop
98e98c1c 456 if(injet[jpart] == -1 && fReader->GetSignalFlag(jpart) == 1)
457 etOut += ptT[jpart]; // particle outside cones and pt cut
70e58892 458 } //end particle loop
459
460 //estimate jets and background areas
461 Float_t areaJet[30];
7d0f353c 462 Float_t areaOut = 4*(header->GetLegoEtaMax())*TMath::Pi();
70e58892 463 for(Int_t k=0; k<nJ; k++){
464 Float_t detamax = etaJet[k] + rc;
465 Float_t detamin = etaJet[k] - rc;
466 Float_t accmax = 0.0; Float_t accmin = 0.0;
7d0f353c 467 if(detamax > header->GetLegoEtaMax()){ // sector outside etamax
468 Float_t h = header->GetLegoEtaMax() - etaJet[k];
70e58892 469 accmax = rc*rc*TMath::ACos(h/rc) - h*TMath::Sqrt(rc*rc - h*h);
470 }
7d0f353c 471 if(detamin < header->GetLegoEtaMin()){ // sector outside etamin
472 Float_t h = header->GetLegoEtaMax() + etaJet[k];
70e58892 473 accmin = rc*rc*TMath::ACos(h/rc) - h*TMath::Sqrt(rc*rc - h*h);
474 }
475 areaJet[k] = rc*rc*TMath::Pi() - accmax - accmin;
476 areaOut = areaOut - areaJet[k];
477 }
478 //subtract background using area method
479 for(Int_t ljet=0; ljet<nJ; ljet++){
480 Float_t areaRatio = areaJet[ljet]/areaOut;
481 etJet[ljet] = etIn[ljet]-etOut*areaRatio; // subtraction
482 }
483
484 // estimate new total background
7d0f353c 485 Float_t areaT = 4*(header->GetLegoEtaMax())*TMath::Pi();
70e58892 486 etbgTotalN = etOut*areaT/areaOut;
487
488
489}
490
491////////////////////////////////////////////////////////////////////////
492
493void AliUA1JetFinderV1::SubtractBackgStat(Int_t& nIn, Int_t&nJ,Float_t&etbgTotalN,
494 Float_t* ptT, Float_t* etaT, Float_t* phiT,
495 Float_t* etJet,Float_t* etaJet, Float_t* phiJet, Float_t* etsigJet,
496 Int_t* multJet, Int_t* injet)
497{
498
499 //background subtraction using statistical method
7d0f353c 500 AliUA1JetHeaderV1* header = (AliUA1JetHeaderV1*) fHeader;
501 Float_t etbgStat = header->GetBackgStat(); // pre-calculated background
70e58892 502
503 //calculate energy inside
7d0f353c 504 Float_t rc= header->GetRadius();
70e58892 505 Float_t etIn[30];
506
507 for(Int_t jpart = 0; jpart < nIn; jpart++){ // loop for all particles in array
98e98c1c 508 //if((fReader->GetCutFlag(jpart)) != 1) continue; // pt cut
70e58892 509 for(Int_t ijet=0; ijet<nJ; ijet++){
510 Float_t deta = etaT[jpart] - etaJet[ijet];
511 Float_t dphi = phiT[jpart] - phiJet[ijet];
512 if (dphi < -TMath::Pi()) dphi= -dphi - 2.0 * TMath::Pi();
513 if (dphi > TMath::Pi()) dphi = 2.0 * TMath::Pi() - dphi;
514 Float_t dr = TMath::Sqrt(deta * deta + dphi * dphi);
515 if(dr <= rc){ // particles inside this cone
70e58892 516 multJet[ijet]++;
517 injet[jpart] = ijet;
98e98c1c 518 if((fReader->GetCutFlag(jpart)) == 1){ // pt cut
519 etIn[ijet]+= ptT[jpart];
520 if(fReader->GetSignalFlag(jpart) == 1) etsigJet[ijet] += ptT[jpart];
521 }
70e58892 522 break;
523 }
524 }// end jets loop
525 } //end particle loop
526
527 //calc jets areas
528 Float_t areaJet[30];
7d0f353c 529 Float_t areaOut = 4*(header->GetLegoEtaMax())*TMath::Pi();
70e58892 530 for(Int_t k=0; k<nJ; k++){
531 Float_t detamax = etaJet[k] + rc;
532 Float_t detamin = etaJet[k] - rc;
533 Float_t accmax = 0.0; Float_t accmin = 0.0;
7d0f353c 534 if(detamax > header->GetLegoEtaMax()){ // sector outside etamax
535 Float_t h = header->GetLegoEtaMax() - etaJet[k];
70e58892 536 accmax = rc*rc*TMath::ACos(h/rc) - h*TMath::Sqrt(rc*rc - h*h);
537 }
7d0f353c 538 if(detamin < header->GetLegoEtaMin()){ // sector outside etamin
539 Float_t h = header->GetLegoEtaMax() + etaJet[k];
70e58892 540 accmin = rc*rc*TMath::ACos(h/rc) - h*TMath::Sqrt(rc*rc - h*h);
541 }
542 areaJet[k] = rc*rc*TMath::Pi() - accmax - accmin;
543 }
544
545 //subtract background using area method
546 for(Int_t ljet=0; ljet<nJ; ljet++){
547 Float_t areaRatio = areaJet[ljet]/areaOut;
548 etJet[ljet] = etIn[ljet]-etbgStat*areaRatio; // subtraction
549 }
550
551 etbgTotalN = etbgStat;
552
553}
554
555////////////////////////////////////////////////////////////////////////
556
557void AliUA1JetFinderV1::SubtractBackgCone(Int_t& nIn, Int_t&nJ,Float_t& etbgTotalN,
558 Float_t* ptT, Float_t* etaT, Float_t* phiT,
559 Float_t* etJet,Float_t* etaJet, Float_t* phiJet, Float_t* etsigJet,
560 Int_t* multJet, Int_t* injet)
561{
562 // Cone background subtraction method taking into acount dEt/deta distribution
7d0f353c 563 AliUA1JetHeaderV1* header = (AliUA1JetHeaderV1*) fHeader;
70e58892 564 //general
7d0f353c 565 Float_t rc= header->GetRadius();
566 Float_t etamax = header->GetLegoEtaMax();
567 Float_t etamin = header->GetLegoEtaMin();
70e58892 568 Int_t ndiv = 100;
569
570 // jet energy and area arrays
571 TH1F* hEtJet[30];
572 TH1F* hAreaJet[30];
573 for(Int_t mjet=0; mjet<nJ; mjet++){
574 char hEtname[256]; char hAreaname[256];
575 sprintf(hEtname, "hEtJet%d", mjet); sprintf(hAreaname, "hAreaJet%d", mjet);
576 hEtJet[mjet] = new TH1F(hEtname,"et dist in eta ",ndiv,etamin,etamax);
577 hAreaJet[mjet] = new TH1F(hAreaname,"area dist in eta ",ndiv,etamin,etamax);
578 }
579 // background energy and area
580 TH1F* hEtBackg = new TH1F("hEtBackg"," backg et dist in eta ",ndiv,etamin,etamax);
581 TH1F* hAreaBackg = new TH1F("hAreaBackg","backg area dist in eta ",ndiv,etamin,etamax);
582
583 //fill energies
584 for(Int_t jpart = 0; jpart < nIn; jpart++){ // loop for all particles in array
70e58892 585 for(Int_t ijet=0; ijet<nJ; ijet++){ // loop for all jets
586 Float_t deta = etaT[jpart] - etaJet[ijet];
98e98c1c 587 Float_t dphi = phiT[jpart] - phiJet[ijet];
70e58892 588 if (dphi < -TMath::Pi()) dphi= -dphi - 2.0 * TMath::Pi();
98e98c1c 589 if (dphi > TMath::Pi()) dphi = 2.0 * TMath::Pi() - dphi;
590 Float_t dr = TMath::Sqrt(deta * deta + dphi * dphi);
70e58892 591 if(dr <= rc){ // particles inside this cone
70e58892 592 injet[jpart] = ijet;
98e98c1c 593 multJet[ijet]++;
594 if((fReader->GetCutFlag(jpart)) == 1){// pt cut
595 hEtJet[ijet]->Fill(etaT[jpart],ptT[jpart]); //particle inside cone
596 if(fReader->GetSignalFlag(jpart) == 1) etsigJet[ijet] += ptT[jpart];
597 }
70e58892 598 break;
599 }
600 }// end jets loop
98e98c1c 601 if(injet[jpart] == -1 && fReader->GetSignalFlag(jpart) == 1)
602 hEtBackg->Fill(etaT[jpart],ptT[jpart]); // particle outside cones
70e58892 603 } //end particle loop
604
605 //calc areas
606 Float_t eta0 = etamin;
607 Float_t etaw = (etamax - etamin)/((Float_t)ndiv);
608 Float_t eta1 = eta0 + etaw;
609 for(Int_t etabin = 0; etabin< ndiv; etabin++){ // loop for all eta bins
610 Float_t etac = eta0 + etaw/2.0;
611 Float_t areabg = etaw*2.0*TMath::Pi();
612 for(Int_t ijet=0; ijet<nJ; ijet++){ // loop for all jets
613 Float_t deta0 = TMath::Abs(eta0 - etaJet[ijet]);
614 Float_t deta1 = TMath::Abs(eta1 - etaJet[ijet]);
615 Float_t acc0 = 0.0; Float_t acc1 = 0.0;
616 Float_t areaj = 0.0;
617 if(deta0 > rc && deta1 < rc){
618 acc1 = rc*rc*TMath::ACos(deta1/rc) - deta1*TMath::Sqrt(rc*rc - deta1*deta1);
619 areaj = acc1;
620 }
621 if(deta0 < rc && deta1 > rc){
622 acc0 = rc*rc*TMath::ACos(deta0/rc) - deta0*TMath::Sqrt(rc*rc - deta0*deta0);
623 areaj = acc0;
624 }
625 if(deta0 < rc && deta1 < rc){
626 acc0 = rc*rc*TMath::ACos(deta0/rc) - deta0*TMath::Sqrt(rc*rc - deta0*deta0);
627 acc1 = rc*rc*TMath::ACos(deta1/rc) - deta1*TMath::Sqrt(rc*rc - deta1*deta1);
628 if(eta1<etaJet[ijet]) areaj = acc1-acc0; // case 1
629 if((eta0 < etaJet[ijet]) && (etaJet[ijet]<eta1)) areaj = rc*rc*TMath::Pi() - acc1 -acc0; // case 2
630 if(etaJet[ijet] < eta0) areaj = acc0 -acc1; // case 3
631 }
632 hAreaJet[ijet]->Fill(etac,areaj);
633 areabg = areabg - areaj;
634 } // end jets loop
635 hAreaBackg->Fill(etac,areabg);
636 eta0 = eta1;
637 eta1 = eta1 + etaw;
638 } // end loop for all eta bins
639
640 //subtract background
641 for(Int_t kjet=0; kjet<nJ; kjet++){
642 etJet[kjet] = 0.0; // first clear etJet for this jet
643 for(Int_t bin = 0; bin< ndiv; bin++){
644 if(hAreaJet[kjet]->GetBinContent(bin)){
645 Float_t areab = hAreaBackg->GetBinContent(bin);
646 Float_t etb = hEtBackg->GetBinContent(bin);
647 Float_t areaR = (hAreaJet[kjet]->GetBinContent(bin))/areab;
648 etJet[kjet] = etJet[kjet] + ((hEtJet[kjet]->GetBinContent(bin)) - etb*areaR); //subtraction
649 }
650 }
651 }
652
653 // calc background total
654 Double_t etOut = hEtBackg->Integral();
655 Double_t areaOut = hAreaBackg->Integral();
7d0f353c 656 Float_t areaT = 4*(header->GetLegoEtaMax())*TMath::Pi();
70e58892 657 etbgTotalN = etOut*areaT/areaOut;
658
659 //delete
660 for(Int_t ljet=0; ljet<nJ; ljet++){ // loop for all jets
661 delete hEtJet[ljet];
662 delete hAreaJet[ljet];
663 }
664
665 delete hEtBackg;
666 delete hAreaBackg;
667}
668
669////////////////////////////////////////////////////////////////////////
670
671
672void AliUA1JetFinderV1::SubtractBackgRatio(Int_t& nIn, Int_t&nJ,Float_t& etbgTotalN,
673 Float_t* ptT, Float_t* etaT, Float_t* phiT,
674 Float_t* etJet,Float_t* etaJet, Float_t* phiJet, Float_t* etsigJet,
675 Int_t* multJet, Int_t* injet)
676{
677 // Ratio background subtraction method taking into acount dEt/deta distribution
7d0f353c 678 AliUA1JetHeaderV1* header = (AliUA1JetHeaderV1*) fHeader;
70e58892 679 //factor F calc before
7d0f353c 680 Float_t bgRatioCut = header->GetBackgCutRatio();
70e58892 681
682
683 //general
7d0f353c 684 Float_t rc= header->GetRadius();
685 Float_t etamax = header->GetLegoEtaMax();
686 Float_t etamin = header->GetLegoEtaMin();
70e58892 687 Int_t ndiv = 100;
688
689 // jet energy and area arrays
690 TH1F* hEtJet[30];
691 TH1F* hAreaJet[30];
692 for(Int_t mjet=0; mjet<nJ; mjet++){
693 char hEtname[256]; char hAreaname[256];
694 sprintf(hEtname, "hEtJet%d", mjet); sprintf(hAreaname, "hAreaJet%d", mjet);
695 hEtJet[mjet] = new TH1F(hEtname,"et dist in eta ",ndiv,etamin,etamax); // change range
696 hAreaJet[mjet] = new TH1F(hAreaname,"area dist in eta ",ndiv,etamin,etamax); // change range
697 }
698 // background energy and area
699 TH1F* hEtBackg = new TH1F("hEtBackg"," backg et dist in eta ",ndiv,etamin,etamax); // change range
700 TH1F* hAreaBackg = new TH1F("hAreaBackg","backg area dist in eta ",ndiv,etamin,etamax); // change range
701
702 //fill energies
703 for(Int_t jpart = 0; jpart < nIn; jpart++){ // loop for all particles in array
98e98c1c 704 //if((fReader->GetCutFlag(jpart)) != 1) continue;
70e58892 705 for(Int_t ijet=0; ijet<nJ; ijet++){ // loop for all jets
706 Float_t deta = etaT[jpart] - etaJet[ijet];
707 Float_t dphi = phiT[jpart] - phiJet[ijet];
708 if (dphi < -TMath::Pi()) dphi= -dphi - 2.0 * TMath::Pi();
709 if (dphi > TMath::Pi()) dphi = 2.0 * TMath::Pi() - dphi;
710 Float_t dr = TMath::Sqrt(deta * deta + dphi * dphi);
711 if(dr <= rc){ // particles inside this cone
70e58892 712 multJet[ijet]++;
713 injet[jpart] = ijet;
98e98c1c 714 if((fReader->GetCutFlag(jpart)) == 1){ //pt cut
715 hEtJet[ijet]->Fill(etaT[jpart],ptT[jpart]); //particle inside cone and pt cut
716 if(fReader->GetSignalFlag(jpart) == 1) etsigJet[ijet] += ptT[jpart];
717 }
70e58892 718 break;
719 }
720 }// end jets loop
98e98c1c 721 if(injet[jpart] == -1) hEtBackg->Fill(etaT[jpart],ptT[jpart]); // particle outside cones
70e58892 722 } //end particle loop
723
724 //calc areas
725 Float_t eta0 = etamin;
726 Float_t etaw = (etamax - etamin)/((Float_t)ndiv);
727 Float_t eta1 = eta0 + etaw;
728 for(Int_t etabin = 0; etabin< ndiv; etabin++){ // loop for all eta bins
729 Float_t etac = eta0 + etaw/2.0;
730 Float_t areabg = etaw*2.0*TMath::Pi();
731 for(Int_t ijet=0; ijet<nJ; ijet++){ // loop for all jets
732 Float_t deta0 = TMath::Abs(eta0 - etaJet[ijet]);
733 Float_t deta1 = TMath::Abs(eta1 - etaJet[ijet]);
734 Float_t acc0 = 0.0; Float_t acc1 = 0.0;
735 Float_t areaj = 0.0;
736 if(deta0 > rc && deta1 < rc){
737 acc1 = rc*rc*TMath::ACos(deta1/rc) - deta1*TMath::Sqrt(rc*rc - deta1*deta1);
738 areaj = acc1;
739 }
740 if(deta0 < rc && deta1 > rc){
741 acc0 = rc*rc*TMath::ACos(deta0/rc) - deta0*TMath::Sqrt(rc*rc - deta0*deta0);
742 areaj = acc0;
743 }
744 if(deta0 < rc && deta1 < rc){
745 acc0 = rc*rc*TMath::ACos(deta0/rc) - deta0*TMath::Sqrt(rc*rc - deta0*deta0);
746 acc1 = rc*rc*TMath::ACos(deta1/rc) - deta1*TMath::Sqrt(rc*rc - deta1*deta1);
747 if(eta1<etaJet[ijet]) areaj = acc1-acc0; // case 1
748 if((eta0 < etaJet[ijet]) && (etaJet[ijet]<eta1)) areaj = rc*rc*TMath::Pi() - acc1 -acc0; // case 2
749 if(etaJet[ijet] < eta0) areaj = acc0 -acc1; // case 3
750 }
751 hAreaJet[ijet]->Fill(etac,areaj);
752 areabg = areabg - areaj;
753 } // end jets loop
754 hAreaBackg->Fill(etac,areabg);
755 eta0 = eta1;
756 eta1 = eta1 + etaw;
757 } // end loop for all eta bins
758
759 //subtract background
760 for(Int_t kjet=0; kjet<nJ; kjet++){
761 etJet[kjet] = 0.0; // first clear etJet for this jet
762 for(Int_t bin = 0; bin< ndiv; bin++){
763 if(hAreaJet[kjet]->GetBinContent(bin)){
764 Float_t areab = hAreaBackg->GetBinContent(bin);
765 Float_t etb = hEtBackg->GetBinContent(bin);
766 Float_t areaR = (hAreaJet[kjet]->GetBinContent(bin))/areab;
767 etJet[kjet] = etJet[kjet] + ((hEtJet[kjet]->GetBinContent(bin)) - etb*areaR*bgRatioCut); //subtraction
768 }
769 }
770 }
771
772 // calc background total
773 Double_t etOut = hEtBackg->Integral();
774 Double_t areaOut = hAreaBackg->Integral();
7d0f353c 775 Float_t areaT = 4*(header->GetLegoEtaMax())*TMath::Pi();
70e58892 776 etbgTotalN = etOut*areaT/areaOut;
777
778 //delete
779 for(Int_t ljet=0; ljet<nJ; ljet++){ // loop for all jets
780 delete hEtJet[ljet];
781 delete hAreaJet[ljet];
782 }
783
784 delete hEtBackg;
785 delete hAreaBackg;
786}
787
788////////////////////////////////////////////////////////////////////////
789
790
791void AliUA1JetFinderV1::Reset()
792{
793 fLego->Reset();
794 fJets->ClearJets();
795}
796
797////////////////////////////////////////////////////////////////////////
798
799void AliUA1JetFinderV1::WriteJHeaderToFile()
800{
7d0f353c 801 AliUA1JetHeaderV1* header = (AliUA1JetHeaderV1*) fHeader;
70e58892 802 fOut->cd();
7d0f353c 803 header->Write();
70e58892 804}
805
806////////////////////////////////////////////////////////////////////////
807
808void AliUA1JetFinderV1::Init()
809{
810 // initializes some variables
7d0f353c 811 AliUA1JetHeaderV1* header = (AliUA1JetHeaderV1*) fHeader;
70e58892 812 // book lego
813 fLego = new
814 TH2F("legoH","eta-phi",
7d0f353c 815 header->GetLegoNbinEta(), header->GetLegoEtaMin(),
816 header->GetLegoEtaMax(), header->GetLegoNbinPhi(),
817 header->GetLegoPhiMin(), header->GetLegoPhiMax());
70e58892 818
819}