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a17e6965 | 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 | ||
392c9b47 | 16 | |
a17e6965 | 17 | //--------------------------------------------------------------------- |
392c9b47 | 18 | // FastJet v2.3.4 finder algorithm interface |
19 | // | |
a17e6965 | 20 | // Author: Rafael.Diaz.Valdes@cern.ch |
392c9b47 | 21 | // |
a17e6965 | 22 | //--------------------------------------------------------------------- |
23 | ||
24 | #include <Riostream.h> | |
25 | #include <TLorentzVector.h> | |
26 | #include <TFile.h> | |
27 | #include <TH1F.h> | |
28 | #include <TH2F.h> | |
29 | #include <TArrayF.h> | |
30 | #include <TRandom.h> | |
31 | #include <TClonesArray.h> | |
32 | ||
33 | #include "AliFastJetFinder.h" | |
34 | #include "AliFastJetHeader.h" | |
35 | #include "AliJetReaderHeader.h" | |
36 | #include "AliJetReader.h" | |
37 | #include "AliJet.h" | |
392c9b47 | 38 | |
39 | ||
40 | #include "fastjet/PseudoJet.hh" | |
41 | #include "fastjet/ClusterSequenceArea.hh" | |
42 | #include "fastjet/AreaDefinition.hh" | |
43 | #include "fastjet/JetDefinition.hh" | |
44 | // get info on how fastjet was configured | |
45 | #include "fastjet/config.h" | |
46 | ||
47 | #ifdef ENABLE_PLUGIN_SISCONE | |
48 | #include "fastjet/SISConePlugin.hh" | |
49 | #endif | |
50 | ||
51 | #include<sstream> // needed for internal io | |
52 | #include<vector> | |
53 | #include <cmath> | |
54 | ||
55 | using namespace std; | |
a17e6965 | 56 | |
57 | ||
58 | ClassImp(AliFastJetFinder); | |
59 | ||
60 | ||
392c9b47 | 61 | //____________________________________________________________________________ |
a17e6965 | 62 | |
63 | AliFastJetFinder::AliFastJetFinder(): | |
392c9b47 | 64 | AliJetFinder() |
a17e6965 | 65 | { |
66 | // Constructor | |
67 | } | |
68 | ||
392c9b47 | 69 | //____________________________________________________________________________ |
a17e6965 | 70 | |
71 | AliFastJetFinder::~AliFastJetFinder() | |
a17e6965 | 72 | { |
73 | // destructor | |
74 | } | |
75 | ||
392c9b47 | 76 | //______________________________________________________________________________ |
a17e6965 | 77 | void AliFastJetFinder::FindJets() |
a17e6965 | 78 | { |
392c9b47 | 79 | |
80 | Bool_t debug = kFALSE; | |
81 | ||
82 | //pick up fastjet header | |
83 | AliFastJetHeader *header = (AliFastJetHeader*)fHeader; | |
84 | ||
85 | // check if we are reading AOD jets | |
86 | TRefArray *refs = 0; | |
87 | Bool_t fromAod = !strcmp(fReader->ClassName(),"AliJetAODReader"); | |
88 | if (fromAod) { refs = fReader->GetReferences(); } | |
89 | ||
90 | // RUN ALGORITHM | |
91 | // read input particles ----------------------------- | |
92 | vector<fastjet::PseudoJet> input_particles; | |
a17e6965 | 93 | TClonesArray *lvArray = fReader->GetMomentumArray(); |
392c9b47 | 94 | if(lvArray == 0) { cout << "Could not get the momentum array" << endl; return; } |
a17e6965 | 95 | Int_t nIn = lvArray->GetEntries(); |
392c9b47 | 96 | if(nIn == 0) { if (debug) cout << "entries = 0 ; Event empty !!!" << endl ; return; } |
97 | Int_t nJets = 0; // n jets in this event | |
98 | fJets->SetNinput(nIn) ; // number of input objects | |
99 | Float_t px,py,pz,en; | |
100 | // load input vectors | |
101 | for(Int_t i = 0; i < nIn; i++){ // loop for all input particles | |
102 | TLorentzVector *lv = (TLorentzVector*) lvArray->At(i); | |
103 | px = lv->Px(); | |
104 | py = lv->Py(); | |
105 | pz = lv->Pz(); | |
106 | en = lv->Energy(); | |
107 | ||
108 | fastjet::PseudoJet input_part(px,py,pz,en); // create PseudoJet object | |
109 | input_part.set_user_index(i); //label the particle into Fastjet algortihm | |
110 | input_particles.push_back(input_part); // back of the input_particles vector | |
111 | } // end loop | |
112 | ||
113 | ||
114 | // create an object that represents your choice of jet algorithm, and | |
115 | // the associated parameters | |
116 | double Rparam = header->GetRparam(); | |
117 | fastjet::Strategy strategy = header->GetStrategy(); | |
118 | fastjet::RecombinationScheme recomb_scheme = header->GetRecombScheme(); | |
119 | fastjet::JetAlgorithm algorithm = header->GetAlgorithm(); | |
120 | fastjet::JetDefinition jet_def(algorithm, Rparam, recomb_scheme, strategy); | |
121 | ||
122 | ||
123 | // create an object that specifies how we to define the area | |
124 | fastjet::AreaDefinition area_def; | |
125 | double ghost_etamax = header->GetGhostEtaMax(); | |
126 | double ghost_area = header->GetGhostArea(); | |
127 | int active_area_repeats = header->GetActiveAreaRepeats(); | |
128 | ||
129 | // now create the object that holds info about ghosts | |
130 | fastjet::GhostedAreaSpec ghost_spec(ghost_etamax, active_area_repeats, ghost_area); | |
131 | // and from that get an area definition | |
132 | fastjet::AreaType area_type = header->GetAreaType(); | |
133 | area_def = fastjet::AreaDefinition(area_type,ghost_spec); | |
134 | ||
135 | // run the jet clustering with the above jet definition | |
136 | fastjet::ClusterSequenceArea clust_seq(input_particles, jet_def, area_def); | |
137 | ||
138 | ||
139 | // save a comment in the header | |
140 | ||
141 | TString comment = "Running FastJet algorithm with the following setup. "; | |
142 | comment+= "Jet definition: "; | |
143 | comment+= TString(jet_def.description()); | |
144 | comment+= ". Area definition: "; | |
145 | comment+= TString(area_def.description()); | |
146 | comment+= ". Strategy adopted by FastJet: "; | |
147 | comment+= TString(clust_seq.strategy_string()); | |
148 | header->SetComment(comment); | |
149 | if(debug){ | |
150 | cout << "--------------------------------------------------------" << endl; | |
151 | cout << comment << endl; | |
152 | cout << "--------------------------------------------------------" << endl; | |
a17e6965 | 153 | } |
392c9b47 | 154 | //header->PrintParameters(); |
155 | ||
156 | ||
157 | // extract the inclusive jets with pt > ptmin, sorted by pt | |
158 | double ptmin = header->GetPtMin(); | |
159 | vector<fastjet::PseudoJet> inclusive_jets = clust_seq.inclusive_jets(ptmin); | |
160 | ||
161 | //cout << "Number of unclustered particles: " << clust_seq.unclustered_particles().size() << endl; | |
162 | ||
163 | ||
164 | //subtract background // =========================================== | |
165 | // set the rapididty , phi range within which to study the background | |
166 | double rap_max = header->GetRapMax(); | |
167 | double rap_min = header->GetRapMin(); | |
168 | double phi_max = header->GetPhiMax(); | |
169 | double phi_min = header->GetPhiMin(); | |
170 | fastjet::RangeDefinition range(rap_min, rap_max, phi_min, phi_max); | |
171 | // subtract background | |
172 | vector<fastjet::PseudoJet> sub_jets = clust_seq.subtracted_jets(range,ptmin); | |
173 | ||
174 | // print out | |
175 | //cout << "Printing inclusive sub jets with pt > "<< ptmin<<" GeV\n"; | |
176 | //cout << "---------------------------------------\n"; | |
177 | //cout << endl; | |
178 | //printf(" ijet rap phi Pt area +- err\n"); | |
179 | ||
180 | // sort jets into increasing pt | |
181 | vector<fastjet::PseudoJet> jets = sorted_by_pt(sub_jets); | |
182 | for (size_t j = 0; j < jets.size(); j++) { // loop for jets | |
183 | ||
184 | double area = clust_seq.area(jets[j]); | |
185 | double area_error = clust_seq.area_error(jets[j]); | |
186 | ||
187 | //printf("%5u %9.5f %8.5f %10.3f %8.3f +- %6.3f\n",j,jets[j].rap(),jets[j].phi(),jets[j].perp(), area, area_error); | |
188 | ||
189 | // go to write AOD info | |
190 | AliAODJet aodjet (jets[j].px(), jets[j].py(), jets[j].pz(), jets[j].E()); | |
191 | //cout << "Printing jet " << endl; | |
192 | if(debug) aodjet.Print(""); | |
193 | //cout << "Adding jet ... " ; | |
194 | AddJet(aodjet); | |
195 | //cout << "added \n" << endl; | |
196 | ||
197 | } // end loop for jets | |
198 | ||
199 | ||
a17e6965 | 200 | } |
201 | ||
392c9b47 | 202 | //____________________________________________________________________________ |
203 | void AliFastJetFinder::RunTest(const char* datafile) | |
a17e6965 | 204 | |
a17e6965 | 205 | { |
a17e6965 | 206 | |
392c9b47 | 207 | // This simple test run the kt algorithm for an ascii file testdata.dat |
208 | // read input particles ----------------------------- | |
209 | vector<fastjet::PseudoJet> input_particles; | |
210 | Float_t px,py,pz,en; | |
211 | ifstream in; | |
212 | Int_t nlines = 0; | |
213 | // we assume a file basic.dat in the current directory | |
214 | // this file has 3 columns of float data | |
215 | in.open(datafile); | |
216 | while (1) { | |
217 | in >> px >> py >> pz >> en; | |
218 | if (!in.good()) break; | |
219 | //printf("px=%8f, py=%8f, pz=%8fn",px,py,pz); | |
220 | nlines++; | |
221 | input_particles.push_back(fastjet::PseudoJet(px,py,pz,en)); | |
a17e6965 | 222 | } |
392c9b47 | 223 | //printf(" found %d pointsn",nlines); |
224 | in.close(); | |
225 | ////////////////////////////////////////////////// | |
226 | ||
227 | // create an object that represents your choice of jet algorithm, and | |
228 | // the associated parameters | |
229 | double Rparam = 1.0; | |
230 | fastjet::Strategy strategy = fastjet::Best; | |
231 | fastjet::RecombinationScheme recomb_scheme = fastjet::BIpt_scheme; | |
232 | fastjet::JetDefinition jet_def(fastjet::kt_algorithm, Rparam, recomb_scheme, strategy); | |
233 | ||
234 | ||
235 | ||
236 | // create an object that specifies how we to define the area | |
237 | fastjet::AreaDefinition area_def; | |
238 | double ghost_etamax = 7.0; | |
239 | double ghost_area = 0.05; | |
240 | int active_area_repeats = 1; | |
241 | ||
242 | ||
243 | // now create the object that holds info about ghosts | |
244 | fastjet::GhostedAreaSpec ghost_spec(ghost_etamax, active_area_repeats, ghost_area); | |
245 | // and from that get an area definition | |
246 | area_def = fastjet::AreaDefinition(fastjet::active_area,ghost_spec); | |
247 | ||
248 | ||
249 | // run the jet clustering with the above jet definition | |
250 | fastjet::ClusterSequenceArea clust_seq(input_particles, jet_def, area_def); | |
251 | ||
252 | ||
253 | // tell the user what was done | |
254 | cout << "--------------------------------------------------------" << endl; | |
255 | cout << "Jet definition was: " << jet_def.description() << endl; | |
256 | cout << "Area definition was: " << area_def.description() << endl; | |
257 | cout << "Strategy adopted by FastJet was "<< clust_seq.strategy_string()<<endl<<endl; | |
258 | cout << "--------------------------------------------------------" << endl; | |
259 | ||
260 | ||
261 | // extract the inclusive jets with pt > 5 GeV, sorted by pt | |
262 | double ptmin = 5.0; | |
263 | vector<fastjet::PseudoJet> inclusive_jets = clust_seq.inclusive_jets(ptmin); | |
264 | ||
265 | cout << "Number of unclustered particles: " << clust_seq.unclustered_particles().size() << endl; | |
266 | ||
267 | ||
268 | //subtract background // =========================================== | |
269 | // set the rapididty range within which to study the background | |
270 | double rap_max = ghost_etamax - Rparam; | |
271 | fastjet::RangeDefinition range(rap_max); | |
272 | // subtract background | |
273 | vector<fastjet::PseudoJet> sub_jets = clust_seq.subtracted_jets(range,ptmin); | |
274 | ||
275 | // print them out //================================================ | |
276 | cout << "Printing inclusive jets after background subtraction \n"; | |
277 | cout << "------------------------------------------------------\n"; | |
278 | // sort jets into increasing pt | |
279 | vector<fastjet::PseudoJet> jets = sorted_by_pt(sub_jets); | |
280 | ||
281 | printf(" ijet rap phi Pt area +- err\n"); | |
282 | for (size_t j = 0; j < jets.size(); j++) { | |
283 | ||
284 | double area = clust_seq.area(jets[j]); | |
285 | double area_error = clust_seq.area_error(jets[j]); | |
286 | ||
287 | printf("%5u %9.5f %8.5f %10.3f %8.3f +- %6.3f\n",j,jets[j].rap(), | |
288 | jets[j].phi(),jets[j].perp(), area, area_error); | |
289 | } | |
290 | cout << endl; | |
291 | // ================================================================ | |
a17e6965 | 292 | |
392c9b47 | 293 | |
294 | ||
a17e6965 | 295 | } |
296 | ||
392c9b47 | 297 | //____________________________________________________________________________ |
a17e6965 | 298 | |
299 | void AliFastJetFinder::WriteJHeaderToFile() | |
300 | { | |
a17e6965 | 301 | fHeader->Write(); |
302 | } | |
303 | ||
392c9b47 | 304 | //____________________________________________________________________________ |