1 //SARAH'S REVISED PERSONAL COPY!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!
5 /**************************************************************************
6 * Copyright(c) 1998-1999, ALICE Experiment at CERN, All rights reserved. *
8 * Author: The ALICE Off-line Project. *
9 * Contributors are mentioned in the code where appropriate. *
11 * Permission to use, copy, modify and distribute this software and its *
12 * documentation strictly for non-commercial purposes is hereby granted *
13 * without fee, provided that the above copyright notice appears in all *
14 * copies and that both the copyright notice and this permission notice *
15 * appear in the supporting documentation. The authors make no claims *
16 * about the suitability of this software for any purpose. It is *
17 * provided "as is" without express or implied warranty. *
18 **************************************************************************/
22 //*--Author: Sarah Blyth (LBL)
23 //*--Based on UA1 jet algorithm from LUND JETSET called from EMC-erj
26 #include "AliEMCALJetFinderInput.h"
27 #include "AliEMCALJetFinderOutput.h"
28 #include "AliEMCALJetFinderAlgo.h"
29 #include "AliEMCALJetFinderAlgoUA1Revised.h"
30 #include "AliEMCALJetFinderAlgoUA1Unit.h"
31 #include "AliEMCALGeometry.h"
33 #include "AliEMCALGetter.h"
34 #include "AliEMCALDigit.h"
35 #include "TParticle.h"
37 #include "AliEMCALJet.h"
41 ClassImp(AliEMCALJetFinderAlgoUA1Revised)
43 AliEMCALJetFinderAlgoUA1Revised::AliEMCALJetFinderAlgoUA1Revised()
46 if (fDebug>0) Info("AliEMCALJetFinderAlgoUA1Revised","Beginning Default Constructor");
49 fNumUnits = 13824; //Number of towers in EMCAL
50 fESeed = 5.0; //Default value
51 fConeRad = 0.5; //Default value
52 fJetEMin = 10.0; //Default value
53 fEtMin = 0.28; //Default value
54 fMinMove = 0.05; //From original UA1 JetFinder
55 fMaxMove = 0.15; //From original UA1 JetFinder
56 fBGMaxMove = 0.035; //From original UA1 JetFinder
59 fEBGTotal = 1.0; //Set to 1 so that no div by zero in first FindJets() loop
77 fRad = 2.0; //Set to 2 to start
80 fArrayInitialised = 0; //Set to FALSE to start
83 AliEMCALJetFinderAlgoUA1Revised::~AliEMCALJetFinderAlgoUA1Revised()
86 if (fDebug>0) Info("AliEMCALJetFinderAlgoUA1Revised","Beginning Destructor");
90 void AliEMCALJetFinderAlgoUA1Revised::SetJetFindingParameters
91 (Int_t numUnits, Float_t eSeed, Float_t coneRad, Float_t jetEMin, Float_t etMin,
92 Float_t minMove, Float_t maxMove, Float_t bgMaxMove)
94 //Sets parameters for the JetFinding algorithm
95 if (fDebug>1) Info("SetJetFindingParameters","Setting parameters for JetFinding");
97 SetNumUnits(numUnits);
104 SetBGMaxMove(bgMaxMove);
107 void AliEMCALJetFinderAlgoUA1Revised::SetJetFindingParameters
108 (Int_t numUnits, Float_t eSeed, Float_t coneRad, Float_t jetEMin, Float_t etMin)
110 //Sets fewer parameters for the JetFinding algorithm
111 if (fDebug>1) Info("SetJetFindingParameters","Setting parameters for JetFinding");
113 SetNumUnits(numUnits);
118 SetMinMove(fMinMove);
119 SetMaxMove(fMaxMove);
120 SetBGMaxMove(fBGMaxMove);
123 void AliEMCALJetFinderAlgoUA1Revised::InitUnitArray()
125 //Initialises unit array
126 if(fArrayInitialised) delete[] fUnit;
127 fUnit = new AliEMCALJetFinderAlgoUA1Unit[fNumUnits];
128 fArrayInitialised = 1;
131 void AliEMCALJetFinderAlgoUA1Revised::FillUnitArray(AliEMCALJetFinderAlgoUA1FillUnitFlagType_t flag)
133 if (fDebug>1) Info("FillUnitArray","Beginning FillUnitArray");
134 //AliEMCAL* pEMCAL = (AliEMCAL*) gAlice->GetModule("EMCAL");
137 // AliEMCALGeometry* geom = AliEMCALGeometry::GetInstance(pEMCAL->GetTitle(), "");
140 //AliEMCALGeometry* geom = AliEMCALGeometry::GetInstance("EMCAL_5655_21", "");
141 AliEMCALGeometry* geom = AliEMCALGetter::Instance()->EMCALGeometry() ;
145 AliEMCALJetFinderAlgoUA1FillUnitFlagType_t option = flag;
146 Int_t numTracks, numDigits;
148 //Loops over all elements in the AliEMCALJetFinderAlgoUA1Unit array and
149 //fills the objects with relevant values from the Data Input object
150 if (fDebug>1) Info("FillUnitArray","Filling array with Unit objects");
151 if (fDebug>1) Info("FillUnitArray","NTracks %i NDigits %i",fInputPointer->GetNTracks(),fInputPointer->GetNDigits());
152 numTracks = fInputPointer->GetNTracks();
153 numDigits = fInputPointer->GetNDigits();
155 AliEMCALDigit *myDigit;
157 //Fill units with Track info if appropriate
158 if(option==kFillTracksOnly || option ==kFillAll)
160 for(Int_t j=0; j<numTracks; j++)
162 myPart = fInputPointer->GetTrack(j);
163 Float_t eta = myPart->Eta();
164 Float_t phi = myPart->Phi();
165 Int_t towerID = geom->TowerIndexFromEtaPhi(eta,180.0/TMath::Pi()*phi);
166 Float_t pT = myPart->Pt();
167 Float_t unitEnergy = fUnit[towerID-1].GetUnitEnergy();
169 //Do Hadron Correction
172 Double_t fullP = myPart->P();
173 Double_t hCEnergy = fHadCorr->GetEnergy(fullP, (Double_t)eta);
174 unitEnergy -= hCEnergy*TMath::Sin(myPart->Theta());
175 fUnit[towerID-1].SetUnitEnergy(unitEnergy);
176 } //end Hadron Correction loop
178 //Do Pt cut on tracks
179 if(fPtCut != 0 && pT < fPtCut) continue;
181 fUnit[towerID-1].SetUnitEnergy(unitEnergy+pT);
184 }//end Tracks condition
187 //Fill units with Digit info if appropriate
188 if(option ==kFillDigitsOnly || option ==kFillAll)
190 for(Int_t k=0; k<numDigits; k++)
192 myDigit = fInputPointer->GetDigit(k);
193 if (fDebug>1) Info("FillUnitArray","getting digits %i %i numdigits",k,numDigits );
194 Int_t towerID = myDigit->GetId();
195 Int_t amplitude = myDigit->GetAmp(); //Gets the integer valued amplitude of the digit
196 Float_t amp = (Float_t)amplitude; //Need to typecast to Float_t before doing real energy conversion
197 Float_t digitEnergy = amp/10000000.0; //Factor of 10 million needed to convert!
198 Float_t unitEnergy = fUnit[towerID-1].GetUnitEnergy() + digitEnergy;
199 fUnit[towerID-1].SetUnitEnergy(unitEnergy);
202 }//end digits condition
204 //Set all unit flags, Eta, Phi
205 for(Int_t i=0; i<fNumUnits; i++)
207 if (fDebug>1) Info("FillUnitArray","Setting all units outside jets");
208 fUnit[i].SetUnitFlag(kOutJet); //Set all units to be outside a jet initially
209 fUnit[i].SetUnitID(i+1);
212 geom->EtaPhiFromIndex(fUnit[i].GetUnitID(), eta, phi);
213 fUnit[i].SetUnitEta(eta);
214 fUnit[i].SetUnitPhi(phi*TMath::Pi()/180.0);
215 // if(i>13000) cout<<"!!!!!!!!!!!!!!!!!For unit0, eta="<<eta<<" and phi="<<phi*TMath::Pi()/180.0<<" and ID="<<fUnit[i].GetUnitID()<<endl;
216 // if(fUnit[i].GetUnitEnergy()>0) cout<<"Unit ID "<<fUnit[i].GetUnitID() <<"with eta="<<eta<<" and phi="<<phi*TMath::Pi()/180.0<<" has energy="<<fUnit[i].GetUnitEnergy()<<endl;
217 }//end loop over all units in array (same as all towers in EMCAL)
221 void AliEMCALJetFinderAlgoUA1Revised::Sort(AliEMCALJetFinderAlgoUA1Unit *unit, Int_t length)
223 //Calls the recursive quicksort method to sort unit objects in decending order of Energy
224 if (fDebug>1) Info("Sort","Sorting Unit objects");
225 QS(unit, 0, length-1);
229 void AliEMCALJetFinderAlgoUA1Revised::QS(AliEMCALJetFinderAlgoUA1Unit *unit, Int_t left, Int_t right)
231 //Sorts the AliEMCALJetFinderAlgoUA1Unit objects in decending order of Energy
232 if (fDebug>111) Info("QS","QuickSorting Unit objects");
236 AliEMCALJetFinderAlgoUA1Unit unitFirst;
237 AliEMCALJetFinderAlgoUA1Unit unitSecond;
241 unitFirst = unit[(left+right)/2];
245 while( (unit[i].GetUnitEnergy() > unitFirst.GetUnitEnergy()) && (i < right)) i++;
246 while( (unitFirst.GetUnitEnergy() > unit[j].GetUnitEnergy()) && (j > left)) j--;
250 unitSecond = unit[i];
252 unit[j] = unitSecond;
258 if(left < j) QS(unit, left, j);
259 if(i < right) QS(unit, i, right);
263 void AliEMCALJetFinderAlgoUA1Revised::FindBG()
265 //Finds the background energy for the iteration
266 if (fDebug>1) Info("FindBG","Finding Average Background");
271 //Loop over all unit objects in the array and sum the energy of those not in a jet
272 for(Int_t i=0; i<fNumUnits; i++)
274 if(fUnit[i].GetUnitFlag() != kInJet)
275 fEBGTotal += fUnit[i].GetUnitEnergy();
279 fEBGTotalOld = fEBGTotal;
280 fEBGAve = fEBGTotal / (fNumUnits - numCone);
281 if (fDebug>5) Info("FindBG","Average BG is %f: ",fEBGAve);
283 for(Int_t count=0; count<fNumUnits;count++)
285 fUnit[count].SetUnitFlag(kOutJet);
290 void AliEMCALJetFinderAlgoUA1Revised::FindJetEtaPhi(Int_t counter)
292 //Finds the eta and phi of the jet axis
293 if (fDebug>1) Info("FindJetEtaPhi","Finding Jet Eta and Phi");
295 fDEta = fUnit[counter].GetUnitEta() - fEtaInit;
296 fDPhi = fUnit[counter].GetUnitPhi() - fPhiInit;
298 fEnergy = fUnit[counter].GetUnitEnergy() - fEBGAve;
299 fJetEtaSum += fEnergy * fDEta;
300 fJetPhiSum += fEnergy * fDPhi;
302 fJetEta = fEtaInit + (fJetEtaSum / fJetESum);
303 fJetPhi = fPhiInit + (fJetPhiSum / fJetESum);
307 void AliEMCALJetFinderAlgoUA1Revised::FindJetEnergy()
309 //Finds the energy of the jet after the final axis has been found
310 if (fDebug>1) Info("FindJetEnergy","Finding Jet Energy");
312 for(Int_t i=0; i<fNumUnits; i++)
314 //Loop over all unit objects in the array and find if within cone radius
315 Float_t dEta = fUnit[i].GetUnitEta() - fJetEta;
316 Float_t dPhi = fUnit[i].GetUnitPhi() - fJetPhi;
317 Float_t rad = TMath::Sqrt( (dEta*dEta) + (dPhi*dPhi) );
319 if(fUnit[i].GetUnitFlag()==kOutJet && rad<= fConeRad)
321 fUnit[i].SetUnitFlag(kInCurrentJet);
322 Float_t energy = fUnit[i].GetUnitEnergy() - fEBGAve;
324 fJetEtaSum += energy * dEta;
325 fJetPhiSum += energy * dPhi;
326 fNumInCone++; //Increment the number of cells in the jet cone
332 void AliEMCALJetFinderAlgoUA1Revised::StoreJetInfo()
334 //Stores the resulting jet information in appropriate storage structure (TO BE DECIDED!!!!)
335 if (fDebug>1) Info("StoreJetInfo","Storing Jet Information");
338 //fJetESum is the final jet energy (background has been subtracted)
339 //fJetEta is the final jet Eta
340 //fJetPhi is the final jet Phi
341 //fNumInCone is the final number of cells included in the jet cone
342 //fEtaInit is the eta of the initiator cell
343 //fPhiInit is the phi of the initiator cell
344 fJet.SetEnergy(fJetESum);
345 fJet.SetEta(fJetEta);
346 fJet.SetPhi(fJetPhi);
348 cout<<"For iteration "<<fNumIter <<" and Jet number " <<fNumJets <<endl;
349 cout<<"The jet energy is: " <<fJetESum <<endl;
350 cout<<"The jet eta is ---->" <<fJetEta <<endl;
351 cout<<"The jet phi is ---->" <<fJetPhi <<endl;
353 Int_t numberTracks = fInputPointer->GetNTracks();
355 Int_t numTracksInCone = 0;
357 for(Int_t counter=0; counter<numberTracks; counter++)
359 myP = fInputPointer->GetTrack(counter);
360 Float_t eta = myP->Eta();
361 Float_t phi = myP->Phi();
362 Float_t deta = fJetEta-eta;
363 Float_t dphi = fJetPhi -phi;
364 Float_t rad = TMath::Sqrt( (deta*deta) + (dphi*dphi));
365 if(rad<=fConeRad) numTracksInCone++;
368 Float_t *pTArray = new Float_t[numTracksInCone];
369 Float_t *etaArray = new Float_t[numTracksInCone];
370 Float_t *phiArray = new Float_t[numTracksInCone];
371 Int_t *pdgArray = new Int_t[numTracksInCone];
374 for(Int_t counter2=0; counter2<numberTracks; counter2++)
376 myP = fInputPointer->GetTrack(counter2);
377 Float_t eta = myP->Eta();
378 Float_t phi = myP->Phi();
379 Float_t deta = fJetEta-eta;
380 Float_t dphi = fJetPhi -phi;
381 Float_t rad = TMath::Sqrt( (deta*deta) + (dphi*dphi));
384 pTArray[index] = myP->Pt();
385 etaArray[index] = eta;
386 phiArray[index] = phi;
387 pdgArray[index] = myP->GetPdgCode();
392 fJet.SetTrackList(numTracksInCone,pTArray, etaArray, phiArray, pdgArray);
393 fOutputObject.AddJet(&fJet);
401 void AliEMCALJetFinderAlgoUA1Revised::FindJets()
403 //Runs the complete UA1 JetFinding algorithm to find jets!
404 if (fDebug>1) Info("FindJets","Starting Jet Finding!!!");
406 //If the array of JetFinderUnit objects has not been initialised then initialise with default settings
407 if(!fArrayInitialised)
410 FillUnitArray(kFillAll);
412 if (fDebug>1) Info("FindJets","Unit array filled");
414 //Step 1. Sort the array in descending order of Energy
415 Sort(fUnit,fNumUnits);
417 //Step 2. Set the number of iterations and Number of jets found to zero to start
421 //Step 3. Begin the iteration loop to find jets
422 //Need to iterate the algorithm while number of iterations<2 OR number of iterations<10 AND
423 //the value of the average background has changed more than specified amount
424 //Min iterations = 2, Max iterations = 10
425 //while(fNumIter<2 || (fNumIter <10 && ( (fEBGTotal-fEBGTotalOld)/fEBGTotal) > fBGMaxMove) )
427 while(fNumIter<2 || (fNumIter <10 && ( fEBGTotal-fEBGTotalOld) > fEBGTotal*fBGMaxMove) )
429 if (fDebug>1) Info("FindJets","Starting BIG iteration ---> %i",fNumIter);
431 //Step 4. Find the value of the average background energy
433 fOutputObject.Reset(kResetJets); //Reset output object to store info for new iteration
436 //Loop over the array of unit objects and flag those with energy below MinCellEt
438 for(Int_t j=0; j<fNumUnits; j++)
440 if( (fUnit[j].GetUnitEnergy()-fEBGAve) < fEtMin)
442 fUnit[j].SetUnitFlag(kBelowMinEt);
444 // if (fDebug>1) Info("FindJets","Below Min Et: %i",j);
448 //Do quick check if there are no jets upfront
449 if(fUnit[0].GetUnitFlag() == kBelowMinEt)
451 cout <<"There are no jets for this event!" <<endl;
455 //Step 5. Begin with the first jet candidate cell (JET SEED LOOP)
456 if (fDebug>5) Info("FindJets","Beginning JET SEED LOOP");
457 for(Int_t count=0; count<fNumUnits; count++)
460 //CHECK CONDITION HERE _ NOT SURE IF SHOULD MAYBE BE: GetUnitEnergy()-fEBGAve >fESeed?????????????????????????????
461 if(fUnit[count].GetUnitEnergy()>=fESeed && fUnit[count].GetUnitFlag()==kOutJet)
463 fEnergy = fUnit[count].GetUnitEnergy() - fEBGAve;
464 fJetEta = fUnit[count].GetUnitEta();
465 fJetPhi = fUnit[count].GetUnitPhi();
466 Int_t seedID = fUnit[count].GetUnitID();
467 if (fDebug>5) Info("FindJets","Inside first candidate jet seed loop for time : %i", count);
468 if (fDebug>5) Info("FindJets","Found candidate energy %f ",fEnergy);
469 if (fDebug>5) Info("FindJets","Found candidate eta %f ", fJetEta);
470 if (fDebug>5) Info("FindJets","Found candidate phi %f ", fJetPhi);
471 if (fDebug>5) Info("FindJets","Found candidate ID %i", seedID);
481 //Step 6. Find Jet Eta and Phi
482 //Loop over all units in the array to find the ones in the jet cone and determine contrib to Jet eta, phi
485 for(Int_t count1=0; count1<fNumUnits; count1++)
487 if(fUnit[count1].GetUnitID() == seedID) continue; //skip unit if the jetseed to avoid doublecounting
488 if(fUnit[count1].GetUnitFlag() == kOutJet)
490 fDEta = fUnit[count1].GetUnitEta() - fJetEta;
491 fDPhi = fUnit[count1].GetUnitPhi() - fJetPhi;
492 fRad = TMath::Sqrt( (fDEta*fDEta) + (fDPhi*fDPhi) );
495 FindJetEtaPhi(count1);
498 }//end for (Jet Eta, Phi LOOP)
500 //Find the distance cone centre moved from previous cone centre
501 if (fDebug>10) Info("FindJets","Checking if cone move small enough");
502 fDistP = TMath::Sqrt( ((fJetEta-fEtaB)*(fJetEta-fEtaB)) + ((fJetPhi-fPhiB)*(fJetPhi-fPhiB)) );
503 // if(fDistP <= fMinMove) break;
506 //Find the distance cone centre is from initiator cell
507 if (fDebug>10) Info("FindJets","Checking if cone move too large");
508 fDistI = TMath::Sqrt( ((fJetEtaSum/fJetESum)*(fJetEtaSum/fJetESum)) + ((fJetPhiSum/fJetESum)*
509 (fJetPhiSum/fJetESum)));
511 if(fDistP>fMinMove && fDistI<fMaxMove)
517 }while(fDistP>fMinMove && fDistI<fMaxMove);
523 //Step 7. Find the Jet Energy
524 if (fDebug>1) Info("FindJets","Looking for Jet energy");
531 //Step 8. Check if the jet is a valid jet
532 //Check if cluster energy is above Min allowed to be a jet
533 //DID NOT DO THE COSH COMPARISON HERE -> NEED TO CHECK WHICH COMPARISON IS BEST!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!
534 if (fDebug>5) Info("FindJets","Checking cluster is valid jet");
535 if(fJetESum < fJetEMin)
537 for(Int_t count2=0; count2<fNumUnits; count2++)
539 if(fUnit[count2].GetUnitFlag()==kInCurrentJet || fUnit[count2].GetUnitFlag()==kOutJet)
540 fUnit[count2].SetUnitFlag(kOutJet);
542 if (fDebug>10) Info("FindJets","NOT a valid jet cell");
545 for(Int_t count2=0; count2<fNumUnits; count2++)
547 if(fUnit[count2].GetUnitFlag()==kInCurrentJet)
549 // cout<<"Setting unit #"<<count2 <<" to be officially in a jet!"<<endl;
550 fUnit[count2].SetUnitFlag(kInJet);
554 //NEED TO CHECK FINAL WEIRD ITERATION OF ETA AND PHI CHANGES!!!!!!!!!
555 // fJetPhi += fJetPhiSum/fJetESum; //CHECK!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!
556 // fJetEta += fJetEtaSum/fJetESum; //CHECK!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!
558 fNumJets++; //Incrementing number of jets found
559 StoreJetInfo(); //Storing jet info
561 }//end if (check cluster above Min Jet Energy)
562 }//end if (Jet Seed condition)
563 }//end (JET SEED LOOP)
565 if (fDebug>5) Info("FindJets","End of BIG iteration number %i",fNumIter);
568 }//end 10 iteration WHILE LOOP