correcting baryon mass subtraction for visible energy in MC
[u/mrichter/AliRoot.git] / JETAN / AliSISConeJetFinder.cxx
CommitLineData
2551af9d 1/**************************************************************************
2 * Copyright(c) 1998-1999, ALICE Experiment at CERN, All rights reserved. *
3 * *
4 * Author: The ALICE Off-line Project. *
5 * Contributors are mentioned in the code where appropriate. *
6 * *
7 * Permission to use, copy, modify and distribute this software and its *
8 * documentation strictly for non-commercial purposes is hereby granted *
9 * without fee, provided that the above copyright notice appears in all *
10 * copies and that both the copyright notice and this permission notice *
11 * appear in the supporting documentation. The authors make no claims *
12 * about the suitability of this software for any purpose. It is *
13 * provided "as is" without express or implied warranty. *
14 **************************************************************************/
15
16
17//---------------------------------------------------------------------
8838ab7a 18// FastJet v2.3.4 finder algorithm interface
2551af9d 19//
20// Author: swensy.jangal@ires.in2p3.fr
8838ab7a 21//
22// Last modification: Neutral cell energy included in the jet reconstruction
23//
24// Author: Magali.estienne@subatech.in2p3.fr
2551af9d 25//---------------------------------------------------------------------
26
8838ab7a 27
2551af9d 28#include <Riostream.h>
29#include <TArrayF.h>
2551af9d 30#include <TFile.h>
31#include <TH1F.h>
32#include <TH2F.h>
33#include <TLorentzVector.h>
34#include <TRandom.h>
8838ab7a 35#include <TClonesArray.h>
2551af9d 36
37#include "AliHeader.h"
2551af9d 38#include "AliJetKineReader.h"
39#include "AliJetReader.h"
40#include "AliJetReaderHeader.h"
8838ab7a 41#include "AliJetUnitArray.h"
2551af9d 42#include "AliSISConeJetFinder.h"
43#include "AliSISConeJetHeader.h"
44
45#include "fastjet/AreaDefinition.hh"
46#include "fastjet/ClusterSequenceArea.hh"
47#include "fastjet/JetDefinition.hh"
48#include "fastjet/PseudoJet.hh"
49
8838ab7a 50// get info on how fastjet was configured
2551af9d 51#include "fastjet/config.h"
52
53#ifdef ENABLE_PLUGIN_SISCONE
54#include "fastjet/SISConePlugin.hh"
55#endif
56
8838ab7a 57#include<sstream> // needed for internal io
2551af9d 58#include<vector>
59#include <cmath>
60
61using namespace std;
62
8838ab7a 63
2551af9d 64ClassImp(AliSISConeJetFinder)
65
8838ab7a 66
2551af9d 67//____________________________________________________________________________
68
69AliSISConeJetFinder::AliSISConeJetFinder():
70AliJetFinder()
71{
72 // Constructor
73}
74
75//____________________________________________________________________________
76
77AliSISConeJetFinder::~AliSISConeJetFinder()
78{
79 // destructor
80}
81
82//______________________________________________________________________________
83void AliSISConeJetFinder::FindJets()
84{
85
2551af9d 86 // Pick up siscone header
87 AliSISConeJetHeader *header = (AliSISConeJetHeader*)fHeader;
cc6a2227 88 Int_t debug = header->GetDebug(); // debug option
8838ab7a 89 Int_t fOpt = fReader->GetReaderHeader()->GetDetector();
2551af9d 90
91 // Check if we are reading AOD jets
92 TRefArray *refs = 0;
93 Bool_t fromAod = !strcmp(fReader->ClassName(),"AliJetAODReader");
94 if (fromAod) { refs = fReader->GetReferences(); }
95
96
97//******************************** SISCONE PLUGIN CONFIGURATION
98// Here we look for SISCone parameters in the header and we define our plugin.
99
100 Double_t coneRadius = header->GetConeRadius(); // cone radius
101 Double_t overlapThreshold = header->GetOverlapThreshold(); // overlap parameter
102 Int_t nPassMax = header->GetNPassMax(); // maximum number of passes
103 Double_t ptProtoJetMin = header->GetPtProtojetMin(); // pT min of protojets
104 Double_t caching = header->GetCaching(); // do we record found cones for this set of data?
105
8838ab7a 106// if (header->GetSplitMergeScale() == 0) fastjet::SISConePlugin::SplitMergeScale splitMergeScale = fastjet::SISConePlugin::SM_pttilde; // There's only one split merge scale
107// Double_t splitMergeStoppingScale = header->GetSplitMergeStoppingScale(); // Additional cut on pt_tilde of protojets
2551af9d 108
109 fastjet::JetDefinition::Plugin * plugin;
110 plugin = new fastjet::SISConePlugin(coneRadius, overlapThreshold, nPassMax, ptProtoJetMin, caching);
111
8838ab7a 112 vector<fastjet::PseudoJet> inputParticles;
2551af9d 113//******************************** READING OF INPUT PARTICLES
114// Here we look for px, py pz and energy of each particle that we gather in a PseudoJet object, and we put all these PseudoJet in a vector of PseudoJets : input_particles.
115
8838ab7a 116 if(fOpt==0)
117 {
118 TClonesArray *lvArray = fReader->GetMomentumArray();
119 Int_t nIn = lvArray->GetEntries();
120
121 // We check if lvArray is ok
122 if(lvArray == 0)
123 {
124 cout << "Could not get the momentum array" << endl;
95345ec0 125 delete plugin;
8838ab7a 126 return;
127 }
128
129 if(nIn == 0)// nIn = Number of particles in the event
130 {
131 if (debug) cout << "entries = 0 ; Event empty !!!" << endl ;
95345ec0 132 delete plugin;
8838ab7a 133 return;
134 }
135
8838ab7a 136 Float_t px,py,pz,en;
137
138 // Load input vectors
139 for(Int_t i = 0; i < nIn; i++)
140 {
141 TLorentzVector *lv = (TLorentzVector*) lvArray->At(i);
142 px = lv->Px();
143 py = lv->Py();
144 pz = lv->Pz();
145 en = lv->Energy();
146
147 fastjet::PseudoJet inputPart(px,py,pz,en);
148 inputPart.set_user_index(i);
149 inputParticles.push_back(inputPart);
150
151 }
152 }
153 else {
154 TClonesArray* fUnit = fReader->GetUnitArray();
95345ec0 155 if(fUnit == 0) { cout << "Could not get the momentum array" << endl; delete plugin; return; }
8838ab7a 156 Int_t nIn = fUnit->GetEntries();
95345ec0 157 if(nIn == 0) { if (debug) cout << "entries = 0 ; Event empty !!!" << endl ; delete plugin; return; }
42b0ac89 158 // Information extracted from fUnitArray
8838ab7a 159 // load input vectors and calculate total energy in array
160 Float_t pt,eta,phi,theta,px,py,pz,en;
161 Int_t ipart = 0;
162 for(Int_t i=0; i<nIn; i++)
163 {
164 AliJetUnitArray *uArray = (AliJetUnitArray*)fUnit->At(i);
165
166 if(uArray->GetUnitEnergy()>0.){
167
168 // It is not necessary anymore to cut on particle pt
169 pt = uArray->GetUnitEnergy();
170 eta = uArray->GetUnitEta();
171 phi = uArray->GetUnitPhi();
172 theta = EtaToTheta(eta);
173 en = (TMath::Abs(TMath::Sin(theta)) == 0) ? pt : pt/TMath::Abs(TMath::Sin(theta));
174 px = TMath::Cos(phi)*pt;
175 py = TMath::Sin(phi)*pt;
176 pz = en*TMath::TanH(eta);
177 if(debug) cout << "pt: " << pt << ", eta: " << eta << ", phi: " << phi << ", en: " << en << ", px: " << px << ", py: " << py << ", pz: " << pz << endl;
178
179 fastjet::PseudoJet inputPart(px,py,pz,en); // create PseudoJet object
180 inputPart.set_user_index(ipart); //label the particle into Fastjet algortihm
181 inputParticles.push_back(inputPart); // back of the input_particles vector
182 ipart++;
183 }
184 } // End loop on UnitArray
185 }
186
187//******************************** CHOICE OF JET AREA
188// Here we determine jets area for subtracting background later
189// For more informations about jet areas see : The Catchment Area of Jets M. Cacciari, G. Salam and G. Soyez
190
191 Double_t ghostEtamax = header->GetGhostEtaMax(); // maximum eta in which a ghost can be generated
192 Double_t ghostArea = header->GetGhostArea(); // area of a ghost
193 Int_t activeAreaRepeats = header->GetActiveAreaRepeats(); // do we repeat area calculation?
194 Double_t gridScatter = header->GetGridScatter(); // fractional random fluctuations of the position of the ghosts on the y-phi grid
195 Double_t ktScatter = header->GetKtScatter(); // fractional random fluctuations of the tranverse momentum of the ghosts on the y-phi grid
196 Double_t meanGhostKt = header->GetMeanGhostKt(); // average transverse momentum of the ghosts.
197
198 Double_t areaTypeNumber = header->GetAreaTypeNumber(); // the number determines jet area type
199 fastjet::AreaType areaType = fastjet::active_area;
200 if (areaTypeNumber == 1) areaType = fastjet::active_area;
201 if (areaTypeNumber == 2) areaType = fastjet::active_area_explicit_ghosts;
202 if (areaTypeNumber == 3) areaType = fastjet::one_ghost_passive_area;
203 if (areaTypeNumber == 4) areaType = fastjet::passive_area;
204 if (areaTypeNumber == 5) areaType = fastjet::voronoi_area;
205
206 fastjet::AreaDefinition areaDef;
207
208 if (areaTypeNumber < 5)
2551af9d 209 {
8838ab7a 210 fastjet::GhostedAreaSpec ghostSpec(ghostEtamax, activeAreaRepeats, ghostArea, gridScatter, ktScatter, meanGhostKt);
211 areaDef = fastjet::AreaDefinition(areaType,ghostSpec);
2551af9d 212 }
213
8838ab7a 214 if (areaTypeNumber == 5)
2551af9d 215 {
8838ab7a 216 Double_t effectiveRFact = header->GetEffectiveRFact();
217 fastjet::VoronoiAreaSpec ghostSpec(effectiveRFact);
218 areaDef = fastjet::AreaDefinition(areaType,ghostSpec);
2551af9d 219 }
220
8838ab7a 221//********************************
222//********************************
2551af9d 223
8838ab7a 224 Bool_t bgMode = header->GetBGMode();// Here one choose to subtract BG or not
2551af9d 225
8838ab7a 226//********************************
227//********************************
2551af9d 228
8838ab7a 229//********************************
230//******************************** BG SUBTRACTION
231 if (bgMode == 1)// BG subtraction
232 {
233 //******************************** JETS FINDING AND EXTRACTION
234 fastjet::ClusterSequenceArea clustSeq(inputParticles, plugin, areaDef);
235 // Here we extract inclusive jets with pt > ptmin, sorted by pt
236 Double_t ptMin = header->GetMinJetPt();
237 vector<fastjet::PseudoJet> inclusiveJets = clustSeq.inclusive_jets(ptMin);
238 vector<fastjet::PseudoJet> jets = sorted_by_pt(inclusiveJets);
239
240 //***************************** BACKGROUND SUBTRACTION
241
242 // Set the rapidity-azimuth range within which to study background
243 Double_t rapMin = header->GetRapMin();
244 Double_t rapMax = header->GetRapMax();
245 Double_t phiMin = header->GetPhiMin();
246 Double_t phiMax = header->GetPhiMax();
247 fastjet::RangeDefinition range(rapMin, rapMax, phiMin, phiMax);
248
249 // rho calculus from Cambridge/Aachen clustering (not from SISCONE as it gives too small areas)
250 Int_t algo = header->GetBGAlgorithm();
251 fastjet::JetAlgorithm algorithm = fastjet::kt_algorithm;
252 if (algo == 0) algorithm = fastjet::kt_algorithm;
253 if (algo == 1) algorithm = fastjet::cambridge_algorithm;
254 fastjet::JetDefinition jetDefForRho(algorithm, 0.5);
255 fastjet::ClusterSequenceArea csForRho(inputParticles, jetDefForRho, areaDef);
256 Double_t rho = csForRho.median_pt_per_unit_area_4vector(range);
257 cout<<"rho = "<<rho<<endl;
258
259 // Vector of corrected jets
260 vector<fastjet::PseudoJet> corrJets = clustSeq.subtracted_jets(rho, ptMin);
261
262 //***************************** JETS DISPLAY
263
264 for (size_t j = 0; j < jets.size(); j++)
265 {
266 // If the jet is only made of ghosts, continue.
267 if (clustSeq.is_pure_ghost(jets[j]) == 1) continue;
268
269 // If the correction is > jet energy px = py = pz = e = 0
270 if (corrJets[j].px() == 0 && corrJets[j].py() == 0 && corrJets[j].pz() == 0 && corrJets[j].E() == 0) continue;
271
9b72221b 272 if(debug){
273 cout<<"********************************** Reconstructed jet(s) (non corrected)"<<endl;
274 cout<<"Jet number "<<j+1<<" : "<<"Rapidity : "<<jets[j].rap()<<" Phi : "<<jets[j].phi()<<" pT : "<<jets[j].perp()<<" area : "<<clustSeq.area(jets[j])<<endl;
275 // cout<<"px = "<<jets[j].px()<<endl;
276 // cout<<"py = "<<jets[j].py()<<endl;
277 // cout<<"pz = "<<jets[j].pz()<<endl;
278 cout<<"e = "<<jets[j].E()<<endl;
279
280 cout<<"********************************** Corrected jet(s)"<<endl;
281 cout<<"Jet number "<<j+1<<" : "<<"Rapidity : "<<corrJets[j].rap()<<" Phi : "<<corrJets[j].phi()<<" pT : "<<corrJets[j].perp()<<endl;
282 // cout<<"px = "<<corrJets[j].px()<<endl;
283 // cout<<"py = "<<corrJets[j].py()<<endl;
284 // cout<<"pz = "<<corrJets[j].pz()<<endl;
285 cout<<"e = "<<corrJets[j].E()<<endl;
286 }
8838ab7a 287 // Go to write AOD info
288 AliAODJet aodjet (corrJets[j].px(), corrJets[j].py(), corrJets[j].pz(), corrJets[j].E());
289 if(debug) aodjet.Print("");
290 AddJet(aodjet);
291 }
292 }
2551af9d 293
8838ab7a 294//********************************
295//******************************** NO BG SUBTRACTION
2551af9d 296
8838ab7a 297 if (bgMode == 0)// No BG subtraction
2551af9d 298 {
8838ab7a 299 //******************************** JETS FINDING AND EXTRACTION
300 fastjet::ClusterSequence clustSeq(inputParticles, plugin);
301 // Here we extract inclusive jets with pt > ptmin, sorted by pt
302 Double_t ptMin = header->GetMinJetPt();
303 vector<fastjet::PseudoJet> inclusiveJets = clustSeq.inclusive_jets(ptMin);
304 vector<fastjet::PseudoJet> jets = sorted_by_pt(inclusiveJets);
305
306 //***************************** JETS DISPLAY
307
308 for (size_t k = 0; k < jets.size(); k++)
309 {
9b72221b 310 if(debug){
311 cout<<"********************************** Reconstructed jet(s) (non corrected)"<<endl;
312 cout<<"Jet number "<<k+1<<" : "<<"Rapidity : "<<jets[k].rap()<<" Phi : "<<jets[k].phi()<<" pT : "<<jets[k].perp()<<endl;
313 // cout<<"px = "<<jets[k].px()<<endl;
314 // cout<<"py = "<<jets[k].py()<<endl;
315 // cout<<"pz = "<<jets[k].pz()<<endl;
316 cout<<"e = "<<jets[k].E()<<endl;
317 }
8838ab7a 318 // Go to write AOD info
319 AliAODJet aodjet (jets[k].px(), jets[k].py(), jets[k].pz(), jets[k].E());
320 if(debug) aodjet.Print("");
321 AddJet(aodjet);
322 }
2551af9d 323 }
95345ec0 324
325 delete plugin;
326
2551af9d 327}
328
329//____________________________________________________________________________
330
8838ab7a 331Float_t AliSISConeJetFinder::EtaToTheta(Float_t arg)
332{
333 // return (180./TMath::Pi())*2.*atan(exp(-arg));
334 return 2.*atan(exp(-arg));
335
336
337}
338
339//____________________________________________________________________________
340
341void AliSISConeJetFinder::InitTask(TChain *tree)
342{
343
344 printf("SISCone jet finder initialization ******************");
345 fReader->CreateTasks(tree);
346
347}
348
349
350//____________________________________________________________________________
351
446dbc09 352void AliSISConeJetFinder::WriteJHeaderToFile() const
2551af9d 353{
354 fHeader->Write();
355}
8838ab7a 356
357//____________________________________________________________________________
358