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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 | /* $Id$ */ | |
16 | ||
17 | /* History of cvs commits: | |
18 | * | |
19 | * $Log$ | |
20 | * Revision 1.7 2007/10/29 13:48:42 gustavo | |
21 | * Corrected coding violations | |
22 | * | |
23 | * Revision 1.5 2007/08/17 12:40:04 schutz | |
24 | * New analysis classes by Gustavo Conesa | |
25 | * | |
26 | * Revision 1.4.4.2 2007/07/26 10:32:09 schutz | |
27 | * new analysis classes in the the new analysis framework | |
28 | * | |
29 | * | |
30 | */ | |
31 | ||
32 | //_________________________________________________________________________ | |
33 | // Class for the analysis of gamma - hadron correlations | |
34 | //*-- Author: Gustavo Conesa (LNF-INFN) | |
35 | ////////////////////////////////////////////////////////////////////////////// | |
36 | ||
37 | ||
38 | // --- ROOT system --- | |
39 | #include "Riostream.h" | |
40 | ||
41 | //---- AliRoot system ---- | |
42 | #include "AliLog.h" | |
43 | #include "AliNeutralMesonSelection.h" | |
44 | #include "AliAnaGammaHadron.h" | |
45 | ||
46 | ClassImp(AliAnaGammaHadron) | |
47 | ||
48 | ||
49 | //____________________________________________________________________________ | |
50 | AliAnaGammaHadron::AliAnaGammaHadron() : | |
51 | AliAnaGammaCorrelation(), | |
52 | fhPhiCharged(0), fhPhiNeutral(0), fhEtaCharged(0), fhEtaNeutral(0), | |
53 | fhDeltaPhiGammaCharged(0), fhDeltaPhiGammaNeutral(0), | |
54 | fhDeltaEtaGammaCharged(0), fhDeltaEtaGammaNeutral(0), | |
55 | fhDeltaPhiChargedPt(0), | |
56 | fhCorrelationGammaNeutral(0), fhCorrelationGammaCharged(0) | |
57 | { | |
58 | //Default Ctor | |
59 | ||
60 | SetCorrelationType(kHadron); | |
61 | //Initialize parameters | |
62 | InitParameters(); | |
63 | } | |
64 | ||
65 | //____________________________________________________________________________ | |
66 | AliAnaGammaHadron::AliAnaGammaHadron(const AliAnaGammaHadron & g) : | |
67 | AliAnaGammaCorrelation(g), | |
68 | fhPhiCharged(g.fhPhiCharged), fhPhiNeutral(g.fhPhiNeutral), | |
69 | fhEtaCharged(g.fhEtaCharged), fhEtaNeutral(g.fhEtaNeutral), | |
70 | fhDeltaPhiGammaCharged(g.fhDeltaPhiGammaCharged), | |
71 | fhDeltaPhiGammaNeutral(g.fhDeltaPhiGammaNeutral), | |
72 | fhDeltaEtaGammaCharged(g.fhDeltaEtaGammaCharged), | |
73 | fhDeltaEtaGammaNeutral(g.fhDeltaEtaGammaNeutral), | |
74 | fhDeltaPhiChargedPt(g.fhDeltaPhiChargedPt), | |
75 | fhCorrelationGammaNeutral(g.fhCorrelationGammaNeutral), | |
76 | fhCorrelationGammaCharged(g.fhCorrelationGammaCharged) | |
77 | { | |
78 | // cpy ctor | |
79 | ||
80 | } | |
81 | ||
82 | //_________________________________________________________________________ | |
83 | AliAnaGammaHadron & AliAnaGammaHadron::operator = (const AliAnaGammaHadron & source) | |
84 | { | |
85 | // assignment operator | |
86 | ||
87 | if(this == &source)return *this; | |
88 | ((AliAnaGammaCorrelation *)this)->operator=(source); | |
89 | ||
90 | fhPhiCharged = source.fhPhiCharged ; fhPhiNeutral = source.fhPhiNeutral ; | |
91 | fhEtaCharged = source.fhEtaCharged ; fhEtaNeutral = source.fhEtaNeutral ; | |
92 | fhDeltaPhiGammaCharged = source.fhDeltaPhiGammaCharged ; | |
93 | fhDeltaPhiGammaNeutral = source.fhDeltaPhiGammaNeutral ; | |
94 | fhDeltaEtaGammaCharged = source.fhDeltaEtaGammaCharged ; | |
95 | fhDeltaEtaGammaNeutral = source.fhDeltaEtaGammaNeutral ; | |
96 | fhDeltaPhiChargedPt = source.fhDeltaPhiChargedPt ; | |
97 | ||
98 | fhCorrelationGammaNeutral = source.fhCorrelationGammaNeutral ; | |
99 | fhCorrelationGammaCharged = source.fhCorrelationGammaCharged ; | |
100 | ||
101 | return *this; | |
102 | ||
103 | } | |
104 | ||
105 | //____________________________________________________________________________ | |
106 | AliAnaGammaHadron::~AliAnaGammaHadron() | |
107 | { | |
108 | // Remove all pointers except analysis output pointers. | |
109 | } | |
110 | ||
111 | ||
112 | //________________________________________________________________________ | |
113 | TList * AliAnaGammaHadron::GetCreateOutputObjects() | |
114 | { | |
115 | ||
116 | // Create histograms to be saved in output file and | |
117 | // store them in fOutputContainer | |
118 | TList * outputContainer = new TList() ; | |
119 | outputContainer->SetName("GammaCorrelationHistos") ; | |
120 | ||
121 | fhPhiCharged = new TH2F | |
122 | ("PhiCharged","#phi_{#pi^{#pm}} vs p_{T #gamma}", | |
123 | 120,0,120,120,0,7); | |
124 | fhPhiCharged->SetYTitle("#phi_{#pi^{#pm}} (rad)"); | |
125 | fhPhiCharged->SetXTitle("p_{T #gamma} (GeV/c)"); | |
126 | ||
127 | fhEtaCharged = new TH2F | |
128 | ("EtaCharged","#eta_{#pi^{#pm}} vs p_{T #gamma}", | |
129 | 120,0,120,120,-1,1); | |
130 | fhEtaCharged->SetYTitle("#eta_{#pi^{#pm}} (rad)"); | |
131 | fhEtaCharged->SetXTitle("p_{T #gamma} (GeV/c)"); | |
132 | ||
133 | fhDeltaPhiGammaCharged = new TH2F | |
134 | ("DeltaPhiGammaCharged","#phi_{#gamma} - #phi_{charged #pi} vs p_{T #gamma}", | |
135 | 200,0,120,200,0,6.4); | |
136 | fhDeltaPhiGammaCharged->SetYTitle("#Delta #phi"); | |
137 | fhDeltaPhiGammaCharged->SetXTitle("p_{T #gamma} (GeV/c)"); | |
138 | ||
139 | fhDeltaPhiChargedPt = new TH2F | |
140 | ("DeltaPhiChargedPt","#phi_{#gamma} - #phi_{charged #pi} vs p_{T #pi}", | |
141 | 200,0,120,200,0,6.4); | |
142 | fhDeltaPhiChargedPt->SetYTitle("#Delta #phi"); | |
143 | fhDeltaPhiChargedPt->SetXTitle("p_{T #pi} (GeV/c)"); | |
144 | ||
145 | fhDeltaEtaGammaCharged = new TH2F | |
146 | ("DeltaEtaGammaCharged","#eta_{#gamma} - #eta_{#pi^{#pm}} vs p_{T #gamma}", | |
147 | 200,0,120,200,-2,2); | |
148 | fhDeltaEtaGammaCharged->SetYTitle("#Delta #eta"); | |
149 | fhDeltaEtaGammaCharged->SetXTitle("p_{T #gamma} (GeV/c)"); | |
150 | ||
151 | fhCorrelationGammaCharged = | |
152 | new TH2F("CorrelationGammaCharged","z_{#gamma #pi} = p_{T #pi^{#pm}} / p_{T #gamma}", | |
153 | 240,0.,120.,1000,0.,1.2); | |
154 | fhCorrelationGammaCharged->SetYTitle("z_{#gamma #pi}"); | |
155 | fhCorrelationGammaCharged->SetXTitle("p_{T #gamma}"); | |
156 | ||
157 | outputContainer->Add(fhPhiCharged) ; | |
158 | outputContainer->Add(fhEtaCharged) ; | |
159 | outputContainer->Add(fhDeltaPhiGammaCharged) ; | |
160 | outputContainer->Add(fhDeltaEtaGammaCharged) ; | |
161 | outputContainer->Add(fhCorrelationGammaCharged) ; | |
162 | outputContainer->Add(fhDeltaPhiChargedPt) ; | |
163 | ||
164 | if(!AreJetsOnlyInCTS()){ | |
165 | //---- kHadron and kJetLeadCone ---- | |
166 | fhPhiNeutral = new TH2F | |
167 | ("PhiNeutral","#phi_{#pi^{0}} vs p_{T #gamma}", | |
168 | 120,0,120,120,0,7); | |
169 | fhPhiNeutral->SetYTitle("#phi_{#pi^{0}} (rad)"); | |
170 | fhPhiNeutral->SetXTitle("p_{T #gamma} (GeV/c)"); | |
171 | ||
172 | fhEtaNeutral = new TH2F | |
173 | ("EtaNeutral","#eta_{#pi^{0}} vs p_{T #gamma}", | |
174 | 120,0,120,120,-1,1); | |
175 | fhEtaNeutral->SetYTitle("#eta_{#pi^{0}} (rad)"); | |
176 | fhEtaNeutral->SetXTitle("p_{T #gamma} (GeV/c)"); | |
177 | ||
178 | fhDeltaPhiGammaNeutral = new TH2F | |
179 | ("DeltaPhiGammaNeutral","#phi_{#gamma} - #phi_{#pi^{0}} vs p_{T #gamma}", | |
180 | 200,0,120,200,0,6.4); | |
181 | fhDeltaPhiGammaNeutral->SetYTitle("#Delta #phi"); | |
182 | fhDeltaPhiGammaNeutral->SetXTitle("p_{T #gamma} (GeV/c)"); | |
183 | ||
184 | fhDeltaEtaGammaNeutral = new TH2F | |
185 | ("DeltaEtaGammaNeutral","#eta_{#gamma} - #eta_{#pi^{#pm}} vs p_{T #gamma}", | |
186 | 200,0,120,200,-2,2); | |
187 | fhDeltaEtaGammaNeutral->SetYTitle("#Delta #eta"); | |
188 | fhDeltaEtaGammaNeutral->SetXTitle("p_{T #gamma} (GeV/c)"); | |
189 | ||
190 | fhCorrelationGammaNeutral = | |
191 | new TH2F("CorrelationGammaNeutral","z_{#gamma #pi} = p_{T #pi^{0}} / p_{T #gamma}", | |
192 | 240,0.,120.,1000,0.,1.2); | |
193 | fhCorrelationGammaNeutral->SetYTitle("z_{#gamma #pi}"); | |
194 | fhCorrelationGammaNeutral->SetXTitle("p_{T #gamma}"); | |
195 | ||
196 | outputContainer->Add(fhPhiNeutral) ; | |
197 | outputContainer->Add(fhEtaNeutral) ; | |
198 | outputContainer->Add(fhDeltaPhiGammaNeutral) ; | |
199 | outputContainer->Add(fhDeltaEtaGammaNeutral) ; | |
200 | outputContainer->Add(fhCorrelationGammaNeutral) ; | |
201 | } | |
202 | ||
203 | SetOutputContainer(outputContainer); | |
204 | ||
205 | return outputContainer; | |
206 | } | |
207 | ||
208 | //____________________________________________________________________________ | |
209 | void AliAnaGammaHadron::InitParameters() | |
210 | { | |
211 | ||
212 | //Initialize the parameters of the analysis. | |
213 | ||
214 | SetMinPtHadron(2.) ; | |
215 | SetDeltaPhiCutRange(1.5,4.5); | |
216 | SetJetsOnlyInCTS(kFALSE) ; | |
217 | ||
218 | } | |
219 | ||
220 | //__________________________________________________________________ | |
221 | void AliAnaGammaHadron::Print(const Option_t * opt) const | |
222 | { | |
223 | ||
224 | //Print some relevant parameters set for the analysis | |
225 | if(! opt) | |
226 | return; | |
227 | ||
228 | Info("Print", "%s %s", GetName(), GetTitle() ) ; | |
229 | printf("Correlation analysis = %d\n", kHadron) ; | |
230 | printf("pT Hadron > %f\n", GetMinPtHadron()) ; | |
231 | printf("Phi gamma-Hadron < %f\n", GetDeltaPhiMaxCut()) ; | |
232 | printf("Phi gamma-Hadron > %f\n", GetDeltaPhiMinCut()) ; | |
233 | ||
234 | ||
235 | } | |
236 | ||
237 | //____________________________________________________________________________ | |
238 | void AliAnaGammaHadron::MakeGammaCorrelation(TParticle * pGamma, TClonesArray * plCTS, TClonesArray * plCalo) | |
239 | { | |
240 | //Gamma Hadron Correlation Analysis | |
241 | AliDebug(2, "Make gamma-hadron correlation"); | |
242 | ||
243 | MakeGammaChargedCorrelation(pGamma, plCTS); | |
244 | if(!AreJetsOnlyInCTS()) | |
245 | MakeGammaNeutralCorrelation(pGamma, plCalo); | |
246 | ||
247 | ||
248 | } | |
249 | ||
250 | //____________________________________________________________________________ | |
251 | void AliAnaGammaHadron::MakeGammaChargedCorrelation(TParticle * pGamma, TClonesArray * pl) | |
252 | { | |
253 | //Gamma Charged Hadron Correlation Analysis | |
254 | AliDebug(2,"Make gamma-charged hadron correlation"); | |
255 | ||
256 | Double_t ptg = pGamma->Pt(); | |
257 | Double_t phig = pGamma->Phi(); | |
258 | Double_t pt = -100.; | |
259 | Double_t rat = -100.; | |
260 | Double_t phi = -100. ; | |
261 | ||
262 | for(Int_t ipr = 0;ipr < pl->GetEntries() ; ipr ++ ){ | |
263 | ||
264 | TParticle * particle = dynamic_cast<TParticle *>(pl->At(ipr)) ; | |
265 | ||
266 | pt = particle->Pt(); | |
267 | rat = pt/ptg ; | |
268 | phi = particle->Phi() ; | |
269 | ||
270 | AliDebug(3,Form("pt %f, phi %f, phi gamma %f. Cuts: delta phi min %f, max%f, pT min %f",pt,phi,phig,GetDeltaPhiMinCut(),GetDeltaPhiMaxCut(),GetMinPtHadron())); | |
271 | ||
272 | fhEtaCharged->Fill(ptg,particle->Eta()); | |
273 | fhPhiCharged->Fill(ptg,phi); | |
274 | fhDeltaEtaGammaCharged->Fill(ptg,pGamma->Eta()-particle->Eta()); | |
275 | fhDeltaPhiGammaCharged->Fill(ptg,phig-phi); | |
276 | fhDeltaPhiChargedPt->Fill(pt,phig-phi); | |
277 | ||
278 | //Selection within angular and energy limits | |
279 | if(((phig-phi)> GetDeltaPhiMinCut()) && ((phig-phi)<GetDeltaPhiMaxCut()) && pt > GetMinPtHadron()){ | |
280 | AliDebug(2,Form("Selected: pt %f, phi %f",pt,phi)); | |
281 | fhCorrelationGammaCharged->Fill(ptg,rat); | |
282 | } | |
283 | }//particle loop | |
284 | } | |
285 | ||
286 | //____________________________________________________________________________ | |
287 | void AliAnaGammaHadron::MakeGammaNeutralCorrelation(TParticle * pGamma, TClonesArray * pl) | |
288 | { | |
289 | //Gamma Neutral Hadron Correlation Analysis | |
290 | AliDebug(2,"Make gamma-neutral hadron correlation"); | |
291 | ||
292 | Double_t pt = -100.; | |
293 | Double_t rat = -100.; | |
294 | Double_t phi = -100. ; | |
295 | Double_t ptg = pGamma->Pt(); | |
296 | Double_t phig = pGamma->Phi(); | |
297 | ||
298 | TIter next(pl); | |
299 | TParticle * particlei = 0; | |
300 | TParticle * particlej = 0; | |
301 | TLorentzVector gammai; | |
302 | TLorentzVector gammaj; | |
303 | ||
304 | Int_t iPrimary = -1; | |
305 | Int_t ksPdg = 0; | |
306 | Int_t jPrimary=-1; | |
307 | ||
308 | while ( (particlei = (TParticle*)next()) ) { | |
309 | iPrimary++; | |
310 | ksPdg = particlei->GetPdgCode(); | |
311 | AliDebug(2, Form("neutral particles opposite to gamma: pt %f, pdg %d", particlei->Pt(),ksPdg)); | |
312 | //2 gamma overlapped, found with PID | |
313 | if(ksPdg == 111){ | |
314 | pt = particlei->Pt(); | |
315 | rat = pt/ptg ; | |
316 | phi = particlei->Phi() ; | |
317 | fhEtaNeutral->Fill(ptg,particlei->Eta()); | |
318 | fhPhiNeutral->Fill(ptg,phi); | |
319 | fhDeltaEtaGammaNeutral->Fill(ptg,pGamma->Eta()-particlei->Eta()); | |
320 | fhDeltaPhiGammaNeutral->Fill(ptg,phig-phi); | |
321 | ||
322 | //Selection within angular and energy limits | |
323 | if( (phig-phi)>GetDeltaPhiMinCut() && (phig-phi)<GetDeltaPhiMaxCut() && pt > GetMinPtHadron()){ | |
324 | fhCorrelationGammaNeutral ->Fill(ptg,rat); | |
325 | AliDebug(2,Form("Selected pi0: pt %f, phi %f",pt,phi)); | |
326 | }// cuts | |
327 | }// pdg = 111 | |
328 | ||
329 | //Make invariant mass analysis | |
330 | else if(ksPdg == 22){// gamma i | |
331 | ||
332 | //Search the photon companion in case it comes from a Pi0 decay | |
333 | //Apply several cuts to select the good pair; | |
334 | particlei->Momentum(gammai); | |
335 | jPrimary=-1; | |
336 | TIter next2(pl); | |
337 | while ( (particlej = (TParticle*)next2()) ) { | |
338 | jPrimary++; | |
339 | if(jPrimary>iPrimary){ | |
340 | ksPdg = particlej->GetPdgCode(); | |
341 | particlej->Momentum(gammaj); | |
342 | if(ksPdg == 22 ){ | |
343 | ||
344 | phi = (gammai+gammaj).Phi(); | |
345 | if(phi < 0) | |
346 | phi+=TMath::TwoPi(); | |
347 | rat = (gammai+gammaj).Pt()/ptg ; | |
348 | ||
349 | //Fill histograms | |
350 | fhEtaNeutral->Fill(ptg,(gammai+gammaj).Eta()); | |
351 | fhPhiNeutral->Fill(ptg,phi); | |
352 | fhDeltaEtaGammaNeutral->Fill(ptg,pGamma->Eta()-(gammai+gammaj).Eta()); | |
353 | fhDeltaPhiGammaNeutral->Fill(ptg,phig-phi); | |
354 | ||
355 | //Select good pair (good phit, pt cuts, aperture and invariant mass) | |
356 | if(GetNeutralMesonSelection()->SelectPair(pGamma, gammai, gammaj)){ | |
357 | AliDebug(2,Form("Selected gamma pair: pt %f, phi %f",(gammai+gammaj).Pt(),phi)); | |
358 | //correlation histogram | |
359 | fhCorrelationGammaNeutral ->Fill(ptg,rat); | |
360 | }//pair selection | |
361 | }//if pair of gammas | |
362 | }//jPrimary>iPrimary | |
363 | }//while | |
364 | }// if pdg = 22 | |
365 | }//while | |
366 | ||
367 | } |