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d89b8229 | 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 | /* $Id$ */ | |
17 | ||
18 | //--------------------------------------------------------------------- | |
19 | // FastJet v2.3.4 finder algorithm interface | |
20 | // Last modification: Neutral cell energy included in the jet reconstruction | |
21 | // | |
22 | // Authors: Rafael.Diaz.Valdes@cern.ch | |
23 | // Magali.estienne@subatech.in2p3.fr (neutral part + bg subtraction option) | |
24 | // | |
25 | // ** 2011 magali.estienne@subatech.in2p3.fr & alexandre.shabetai@cern.ch | |
26 | // new implementation of background subtraction | |
27 | // allowing to subtract bkg using a different algo than the one used for signal jets | |
28 | //--------------------------------------------------------------------- | |
29 | ||
30 | #include <Riostream.h> | |
31 | ||
32 | #include "AliFastJetFinder.h" | |
33 | #include "AliFastJetHeaderV1.h" | |
34 | #include "AliFastJetInput.h" | |
35 | #include "AliFastJetBkg.h" | |
36 | #include "AliAODJetEventBackground.h" | |
37 | #include "AliAODJet.h" | |
38 | ||
39 | #include "fastjet/PseudoJet.hh" | |
40 | #include "fastjet/ClusterSequenceArea.hh" | |
41 | #include "fastjet/AreaDefinition.hh" | |
42 | #include "fastjet/JetDefinition.hh" | |
43 | ||
44 | #include<vector> | |
45 | ||
46 | using namespace std; | |
47 | ||
48 | ClassImp(AliFastJetFinder) | |
49 | ||
50 | //////////////////////////////////////////////////////////////////////// | |
51 | ||
52 | AliFastJetFinder::AliFastJetFinder(): | |
53 | AliJetFinder(), | |
54 | fInputFJ(new AliFastJetInput()), | |
55 | fJetBkg(new AliFastJetBkg()) | |
56 | { | |
57 | // Constructor | |
58 | } | |
59 | ||
60 | //____________________________________________________________________________ | |
61 | AliFastJetFinder::~AliFastJetFinder() | |
62 | { | |
63 | // destructor | |
64 | delete fInputFJ; | |
65 | delete fJetBkg; | |
66 | ||
67 | } | |
68 | ||
69 | //______________________________________________________________________________ | |
70 | void AliFastJetFinder::FindJets() | |
71 | { | |
72 | // runs a FASTJET based algo | |
73 | ||
74 | //pick up fastjet header | |
75 | AliFastJetHeaderV1 *header = (AliFastJetHeaderV1*)fHeader; | |
76 | Int_t debug = header->GetDebug(); // debug option | |
77 | Bool_t bgMode = header->GetBGMode(); // choose to subtract BG or not | |
78 | if(debug>0) cout<<"----------in AliFastJetFinder::FindJets() ------------------"<<endl; | |
79 | ||
80 | // RUN ALGORITHM | |
81 | // read input particles ----------------------------- | |
82 | ||
83 | vector<fastjet::PseudoJet> inputParticles=fInputFJ->GetInputParticles(); | |
84 | if(inputParticles.size()==0){ | |
85 | if(debug>0) Printf("%s:%d No input particles found, skipping event",(char*)__FILE__,__LINE__); | |
86 | return; | |
87 | } | |
88 | ||
89 | // create an object that represents your choice of jet algorithm, and | |
90 | // the associated parameters | |
91 | double rParam = header->GetRparam(); | |
92 | double rBkgParam = header->GetRparamBkg(); | |
93 | fastjet::Strategy strategy = header->GetStrategy(); | |
94 | fastjet::RecombinationScheme recombScheme = header->GetRecombScheme(); | |
95 | fastjet::JetAlgorithm algorithm = header->GetAlgorithm(); | |
96 | fastjet::JetDefinition jetDef(algorithm, rParam, recombScheme, strategy); | |
97 | ||
98 | // create an object that specifies how we to define the area | |
99 | fastjet::AreaDefinition areaDef; | |
100 | double ghostEtamax = header->GetGhostEtaMax(); | |
101 | double ghostArea = header->GetGhostArea(); | |
102 | int activeAreaRepeats = header->GetActiveAreaRepeats(); | |
103 | ||
104 | // now create the object that holds info about ghosts | |
105 | fastjet::GhostedAreaSpec ghostSpec(ghostEtamax, activeAreaRepeats, ghostArea); | |
106 | // and from that get an area definition | |
107 | fastjet::AreaType areaType = header->GetAreaType(); | |
108 | areaDef = fastjet::AreaDefinition(areaType,ghostSpec); | |
109 | ||
110 | //***************************** JETS FINDING | |
111 | // run the jet clustering with the above jet definition | |
112 | fastjet::ClusterSequenceArea clust_seq(inputParticles, jetDef, areaDef); | |
113 | ||
114 | vector<fastjet::PseudoJet> jets; | |
115 | ||
116 | if(bgMode) // Do BG subtraction directly with the same algorithm (cambridge or kt) for jet signal and background | |
117 | { | |
118 | //***************************** JETS FINDING FOR RHO ESTIMATION | |
119 | // run the jet clustering with the above jet definition | |
120 | fastjet::JetAlgorithm algorithmBkg = header->GetBGAlgorithm(); | |
121 | fastjet::JetDefinition jetDefBkg(algorithmBkg, rBkgParam, recombScheme, strategy); | |
122 | fastjet::ClusterSequenceArea clust_seq_bkg(inputParticles, jetDefBkg, areaDef); | |
123 | ||
124 | // save a comment in the header | |
125 | TString comment = "Running FastJet algorithm with the following setup. "; | |
126 | comment+= "Jet definition: "; | |
127 | comment+= TString(jetDef.description()); | |
128 | comment+= "Jet bckg definition: "; | |
129 | comment+= TString(jetDefBkg.description()); | |
130 | comment+= ". Area definition: "; | |
131 | comment+= TString(areaDef.description()); | |
132 | comment+= ". Strategy adopted by FastJet: "; | |
133 | comment+= TString(clust_seq.strategy_string()); | |
134 | header->SetComment(comment); | |
135 | if(debug>0){ | |
136 | cout << "--------------------------------------------------------" << endl; | |
137 | cout << comment << endl; | |
138 | cout << "--------------------------------------------------------" << endl; | |
139 | } | |
140 | ||
141 | // extract the inclusive jets sorted by pt | |
142 | double ptmin = header->GetPtMin(); | |
143 | vector<fastjet::PseudoJet> inclusiveJets = clust_seq.inclusive_jets(); | |
144 | ||
145 | //subtract background // =========================================== | |
146 | // set the rapididty , phi range within which to study the background | |
147 | double rapMax = header->GetRapMax(); | |
148 | double rapMin = header->GetRapMin(); | |
149 | double phiMax = header->GetPhiMax(); | |
150 | double phiMin = header->GetPhiMin(); | |
151 | fastjet::RangeDefinition range(rapMin, rapMax, phiMin, phiMax); | |
152 | ||
153 | // Extract rho and sigma | |
154 | Double_t rho = 0.; | |
155 | Double_t sigma = 0.; | |
156 | Double_t meanarea = 0.; | |
157 | Bool_t kUse4VectorArea = header->Use4VectorArea(); | |
158 | vector<fastjet::PseudoJet> bkgJets = clust_seq_bkg.inclusive_jets(); | |
159 | clust_seq_bkg.get_median_rho_and_sigma(bkgJets,range, kUse4VectorArea, rho, sigma, meanarea, false); | |
160 | ||
161 | // subtract background and extract jets bkg subtracted | |
162 | vector<fastjet::PseudoJet> subJets = clust_seq.subtracted_jets(rho,ptmin); | |
163 | ||
164 | // sort jets into increasing pt | |
165 | jets = sorted_by_pt(subJets); | |
166 | ||
167 | } | |
168 | ||
169 | else { // No BG subtraction!!!!!!!! Default header is bgmode=0. | |
170 | ||
171 | // save a comment in the header | |
172 | TString comment = "Running FastJet algorithm with the following setup. "; | |
173 | comment+= "Jet definition: "; | |
174 | comment+= TString(jetDef.description()); | |
175 | comment+= ". Strategy adopted by FastJet: "; | |
176 | comment+= TString(clust_seq.strategy_string()); | |
177 | header->SetComment(comment); | |
178 | if(debug>0){ | |
179 | cout << "--------------------------------------------------------" << endl; | |
180 | cout << comment << endl; | |
181 | cout << "--------------------------------------------------------" << endl; | |
182 | } | |
183 | ||
184 | // extract the inclusive jets with pt > ptmin, sorted by pt | |
185 | double ptmin = header->GetPtMin(); | |
186 | vector<fastjet::PseudoJet> inclusiveJets = clust_seq.inclusive_jets(ptmin); | |
187 | ||
188 | jets = sorted_by_pt(inclusiveJets); | |
189 | ||
190 | } | |
191 | ||
192 | for (size_t j = 0; j < jets.size(); j++) { // loop for jets | |
193 | ||
194 | double area = clust_seq.area(jets[j]); | |
195 | double areaError = clust_seq.area_error(jets[j]); | |
196 | ||
197 | if(debug>0) printf("Jet found %5d %9.5f %8.5f %10.3f \n",(Int_t)j,jets[j].rap(),jets[j].phi(),jets[j].perp()); | |
198 | ||
199 | vector<fastjet::PseudoJet> constituents = clust_seq.constituents(jets[j]); | |
200 | int nCon= constituents.size(); | |
201 | TArrayI ind(nCon); | |
202 | ||
203 | if ((jets[j].eta() > (header->GetJetEtaMax())) || | |
204 | (jets[j].eta() < (header->GetJetEtaMin())) || | |
205 | (jets[j].phi() > (header->GetJetPhiMax())) || | |
206 | (jets[j].phi() < (header->GetJetPhiMin())) || | |
207 | (jets[j].perp() < header->GetPtMin())) continue; // acceptance eta range and etmin | |
208 | ||
209 | // go to write AOD info | |
210 | AliAODJet aodjet (jets[j].px(), jets[j].py(), jets[j].pz(), jets[j].E()); | |
211 | aodjet.SetEffArea(area,areaError); | |
212 | //cout << "Printing jet " << endl; | |
213 | if(debug>0) aodjet.Print(""); | |
214 | ||
215 | for (int i=0; i < nCon; i++) | |
216 | { | |
217 | fastjet::PseudoJet mPart=constituents[i]; | |
218 | ind[i]=mPart.user_index(); | |
219 | ||
220 | // Jet constituents (charged tracks) added to the AliAODJet | |
221 | AliJetCalTrkEvent* calEvt = GetCalTrkEvent(); | |
222 | for(Int_t itrack=0; itrack<calEvt->GetNCalTrkTracks(); itrack++) | |
223 | { | |
224 | if(itrack==ind[i]) | |
225 | { | |
226 | TObject *track = calEvt->GetCalTrkTrack(itrack)->GetTrackObject(); | |
227 | aodjet.AddTrack(track); | |
228 | } | |
229 | } | |
230 | } // End loop on Constituents | |
231 | ||
232 | AddJet(aodjet); | |
233 | ||
234 | } // end loop for jets | |
235 | ||
236 | } | |
237 | ||
238 | //____________________________________________________________________________ | |
239 | void AliFastJetFinder::RunTest(const char* datafile) | |
240 | { | |
241 | // This simple test run the kt algorithm for an ascii file testdata.dat | |
242 | ||
243 | // read input particles ----------------------------- | |
244 | vector<fastjet::PseudoJet> inputParticles; | |
245 | Float_t px,py,pz,en; | |
246 | ifstream in; | |
247 | Int_t nlines = 0; | |
248 | // we assume a file basic.dat in the current directory | |
249 | // this file has 3 columns of float data | |
250 | in.open(datafile); | |
251 | while (1) { | |
252 | in >> px >> py >> pz >> en; | |
253 | if (!in.good()) break; | |
254 | //printf("px=%8f, py=%8f, pz=%8fn",px,py,pz); | |
255 | nlines++; | |
256 | inputParticles.push_back(fastjet::PseudoJet(px,py,pz,en)); | |
257 | } | |
258 | //printf(" found %d pointsn",nlines); | |
259 | in.close(); | |
260 | ////////////////////////////////////////////////// | |
261 | ||
262 | // create an object that represents your choice of jet algorithm, and | |
263 | // the associated parameters | |
264 | double rParam = 1.0; | |
265 | fastjet::Strategy strategy = fastjet::Best; | |
266 | fastjet::RecombinationScheme recombScheme = fastjet::BIpt_scheme; | |
267 | fastjet::JetDefinition jetDef(fastjet::kt_algorithm, rParam, recombScheme, strategy); | |
268 | ||
269 | // create an object that specifies how we to define the area | |
270 | fastjet::AreaDefinition areaDef; | |
271 | double ghostEtamax = 7.0; | |
272 | double ghostArea = 0.05; | |
273 | int activeAreaRepeats = 1; | |
274 | ||
275 | // now create the object that holds info about ghosts | |
276 | fastjet::GhostedAreaSpec ghostSpec(ghostEtamax, activeAreaRepeats, ghostArea); | |
277 | // and from that get an area definition | |
278 | areaDef = fastjet::AreaDefinition(fastjet::active_area,ghostSpec); | |
279 | ||
280 | // run the jet clustering with the above jet definition | |
281 | fastjet::ClusterSequenceArea clust_seq(inputParticles, jetDef, areaDef); | |
282 | ||
283 | // tell the user what was done | |
284 | cout << "--------------------------------------------------------" << endl; | |
285 | cout << "Jet definition was: " << jetDef.description() << endl; | |
286 | cout << "Area definition was: " << areaDef.description() << endl; | |
287 | cout << "Strategy adopted by FastJet was "<< clust_seq.strategy_string()<<endl<<endl; | |
288 | cout << "--------------------------------------------------------" << endl; | |
289 | ||
290 | // extract the inclusive jets with pt > 5 GeV, sorted by pt | |
291 | double ptmin = 5.0; | |
292 | vector<fastjet::PseudoJet> inclusiveJets = clust_seq.inclusive_jets(ptmin); | |
293 | ||
294 | cout << "Number of unclustered particles: " << clust_seq.unclustered_particles().size() << endl; | |
295 | ||
296 | //subtract background // =========================================== | |
297 | // set the rapididty range within which to study the background | |
298 | double rapMax = ghostEtamax - rParam; | |
299 | fastjet::RangeDefinition range(rapMax); | |
300 | // subtract background | |
301 | vector<fastjet::PseudoJet> subJets = clust_seq.subtracted_jets(range,ptmin); | |
302 | ||
303 | // print them out //================================================ | |
304 | cout << "Printing inclusive jets after background subtraction \n"; | |
305 | cout << "------------------------------------------------------\n"; | |
306 | // sort jets into increasing pt | |
307 | vector<fastjet::PseudoJet> jets = sorted_by_pt(subJets); | |
308 | ||
309 | printf(" ijet rap phi Pt area +- err\n"); | |
310 | for (size_t j = 0; j < jets.size(); j++) { | |
311 | double area = clust_seq.area(jets[j]); | |
312 | double areaError = clust_seq.area_error(jets[j]); | |
313 | printf("%5d %9.5f %8.5f %10.3f %8.3f +- %6.3f\n",(Int_t)j,jets[j].rap(), | |
314 | jets[j].phi(),jets[j].perp(), area, areaError); | |
315 | } | |
316 | cout << endl; | |
317 | // ================================================================ | |
318 | ||
319 | } | |
320 | ||
321 | //____________________________________________________________________________ | |
322 | void AliFastJetFinder::WriteJHeaderToFile() const | |
323 | { | |
324 | // Write Jet Header to file | |
325 | fHeader->Write(); | |
326 | ||
327 | } | |
328 | ||
329 | //____________________________________________________________________________ | |
330 | Bool_t AliFastJetFinder::ProcessEvent() | |
331 | { | |
332 | // Process one event | |
333 | // Charged only or charged+neutral jets | |
334 | ||
335 | fInputFJ->SetHeader(fHeader); | |
336 | fInputFJ->SetCalTrkEvent(GetCalTrkEvent()); | |
337 | fInputFJ->FillInput(); | |
338 | ||
339 | // Find Jets | |
340 | FindJets(); | |
341 | ||
342 | // Background | |
343 | if(fAODEvBkg){ | |
344 | AliFastJetHeaderV1 *header = (AliFastJetHeaderV1*)fHeader; | |
345 | ||
346 | fJetBkg->SetHeader(fHeader); | |
347 | fJetBkg->SetFastJetInput(fInputFJ); | |
348 | ||
349 | Int_t count = 0; | |
350 | if(header->GetBkgFastJetb()){ | |
351 | Double_t sigma1 = 0 , meanarea1= 0, bkg1 = 0; | |
352 | fJetBkg->BkgFastJetb(bkg1,sigma1,meanarea1); | |
353 | fAODEvBkg->SetBackground(count,bkg1,sigma1,meanarea1); | |
354 | count++; | |
355 | } | |
356 | ||
357 | if(header->GetBkgFastJetWoHardest()){ | |
358 | Double_t sigma2 = 0 , meanarea2 = 0, bkg2 = 0; | |
359 | fJetBkg->BkgFastJetWoHardest(bkg2,sigma2,meanarea2); | |
360 | fAODEvBkg->SetBackground(count,bkg2,sigma2,meanarea2); | |
361 | count++; | |
362 | } | |
363 | ||
364 | } | |
365 | ||
366 | Reset(); | |
367 | return kTRUE; | |
368 | ||
369 | } |