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1c5acb87 | 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: AliNeutralMesonSelection.cxx 27413 2008-07-18 13:28:12Z gconesab $ */ | |
16 | ||
17 | //_________________________________________________________________________ | |
18 | // Class that contains methods to select candidate pairs to neutral meson | |
19 | // 2 main selections, invariant mass around pi0 (also any other mass), | |
20 | // apperture angle to distinguish from combinatorial. | |
21 | //-- Author: Gustavo Conesa (INFN-LNF) | |
22 | ||
23 | // --- ROOT system --- | |
24 | #include <TLorentzVector.h> | |
25 | #include <TH2.h> | |
26 | #include <TList.h> | |
1c5acb87 | 27 | |
28 | //---- AliRoot system ---- | |
29 | #include "AliNeutralMesonSelection.h" | |
1c5acb87 | 30 | |
31 | ClassImp(AliNeutralMesonSelection) | |
32 | ||
33 | ||
34 | //____________________________________________________________________________ | |
35 | AliNeutralMesonSelection::AliNeutralMesonSelection() : | |
36 | TObject(), fM(0), | |
37 | fInvMassMaxCut(0.), fInvMassMinCut(0.), | |
38 | fAngleMaxParam(), fKeepNeutralMesonHistos(0), | |
39 | fhAnglePairNoCut(0), fhAnglePairOpeningAngleCut(0), | |
40 | fhAnglePairAllCut(0), | |
41 | fhInvMassPairNoCut(0), fhInvMassPairOpeningAngleCut(0), | |
42 | fhInvMassPairAllCut(0), | |
477d6cee | 43 | fHistoNEBins(0), fHistoEMax(0.), fHistoEMin(0.), |
44 | fHistoNPtBins(0), fHistoPtMax(0.), fHistoPtMin(0.), | |
45 | fHistoNAngleBins(0), fHistoAngleMax(0.), fHistoAngleMin(0.), | |
46 | fHistoNIMBins(0), fHistoIMMax(0.), fHistoIMMin(0.) | |
47 | { | |
1c5acb87 | 48 | //Default Ctor |
49 | ||
50 | //Initialize parameters | |
51 | ||
52 | // kGammaHadron and kGammaJet | |
53 | fAngleMaxParam.Set(4) ; | |
54 | fAngleMaxParam.Reset(0.); | |
55 | ||
56 | //Initialize parameters | |
57 | InitParameters(); | |
58 | } | |
59 | ||
60 | //____________________________________________________________________________ | |
61 | AliNeutralMesonSelection::AliNeutralMesonSelection(const AliNeutralMesonSelection & g) : | |
62 | TObject(), fM(g.fM), | |
63 | fInvMassMaxCut(g.fInvMassMaxCut), fInvMassMinCut(g.fInvMassMinCut), | |
64 | fAngleMaxParam(g.fAngleMaxParam), | |
65 | fKeepNeutralMesonHistos(g.fKeepNeutralMesonHistos), | |
66 | fhAnglePairNoCut(g. fhAnglePairNoCut), | |
67 | fhAnglePairOpeningAngleCut(g. fhAnglePairOpeningAngleCut), | |
68 | fhAnglePairAllCut(g. fhAnglePairAllCut), | |
69 | fhInvMassPairNoCut(g.fhInvMassPairNoCut), | |
70 | fhInvMassPairOpeningAngleCut(g.fhInvMassPairOpeningAngleCut), | |
71 | fhInvMassPairAllCut(g.fhInvMassPairAllCut), | |
72 | fHistoNEBins(g.fHistoNEBins), fHistoEMax(g.fHistoEMax), fHistoEMin(g.fHistoEMin), | |
73 | fHistoNPtBins(g.fHistoNPtBins), fHistoPtMax(g.fHistoPtMax), fHistoPtMin(g.fHistoPtMin), | |
74 | fHistoNAngleBins(g.fHistoNAngleBins), fHistoAngleMax(g.fHistoAngleMax), fHistoAngleMin(g.fHistoAngleMin), | |
75 | fHistoNIMBins(g.fHistoNIMBins), fHistoIMMax(g.fHistoIMMax), fHistoIMMin(g.fHistoIMMin) | |
76 | { | |
77 | // cpy ctor | |
78 | } | |
79 | ||
80 | //_________________________________________________________________________ | |
81 | AliNeutralMesonSelection & AliNeutralMesonSelection::operator = (const AliNeutralMesonSelection & source) | |
82 | { | |
83 | // assignment operator | |
84 | ||
85 | if(this == &source)return *this; | |
86 | ((TObject *)this)->operator=(source); | |
87 | ||
88 | fM = source.fM ; | |
89 | fInvMassMaxCut = source.fInvMassMaxCut ; | |
90 | fInvMassMinCut = source.fInvMassMinCut ; | |
91 | fAngleMaxParam = source.fAngleMaxParam ; | |
92 | fKeepNeutralMesonHistos = source.fKeepNeutralMesonHistos; | |
93 | ||
94 | fhAnglePairNoCut = source. fhAnglePairNoCut ; | |
95 | fhAnglePairOpeningAngleCut = source. fhAnglePairOpeningAngleCut ; | |
96 | fhAnglePairAllCut = source. fhAnglePairAllCut ; | |
97 | fhInvMassPairNoCut = source.fhInvMassPairNoCut ; | |
98 | fhInvMassPairOpeningAngleCut = source.fhInvMassPairOpeningAngleCut ; | |
99 | fhInvMassPairAllCut = source.fhInvMassPairAllCut ; | |
100 | ||
101 | fHistoNEBins = source.fHistoNEBins; fHistoEMax = source.fHistoEMax; fHistoEMin = source.fHistoEMin; | |
102 | fHistoNPtBins = source.fHistoNPtBins; fHistoPtMax = source.fHistoPtMax; fHistoPtMin = source.fHistoPtMin; | |
103 | fHistoNAngleBins = source.fHistoNAngleBins; fHistoAngleMax = source.fHistoAngleMax; fHistoAngleMin = source.fHistoAngleMin; | |
104 | fHistoNIMBins = source.fHistoNIMBins; fHistoIMMax = source.fHistoIMMax; fHistoIMMin = source.fHistoIMMin; | |
105 | ||
106 | return *this; | |
107 | ||
108 | } | |
109 | ||
110 | //____________________________________________________________________________ | |
111 | AliNeutralMesonSelection::~AliNeutralMesonSelection() | |
112 | { | |
113 | //dtor | |
114 | ||
115 | if(!fKeepNeutralMesonHistos){ | |
116 | //Histograms initialized and filled but not passed to output container | |
117 | //delete here, I am not sure this is correct | |
118 | ||
119 | if(fhAnglePairNoCut) delete fhAnglePairNoCut; | |
120 | if(fhAnglePairOpeningAngleCut) delete fhAnglePairOpeningAngleCut; | |
121 | if(fhAnglePairAllCut) delete fhAnglePairAllCut; | |
122 | if(fhInvMassPairNoCut) delete fhInvMassPairNoCut; | |
123 | if(fhInvMassPairOpeningAngleCut) delete fhInvMassPairOpeningAngleCut; | |
124 | if(fhInvMassPairAllCut) delete fhInvMassPairAllCut; | |
125 | ||
126 | } | |
127 | ||
128 | } | |
129 | //________________________________________________________________________ | |
130 | TList * AliNeutralMesonSelection::GetCreateOutputObjects() | |
131 | { | |
477d6cee | 132 | // Create histograms to be saved in output file and |
133 | // store them in outputContainer of the analysis class that calls this class. | |
134 | ||
135 | TList * outputContainer = new TList() ; | |
136 | outputContainer->SetName("MesonDecayHistos") ; | |
137 | ||
138 | fhAnglePairNoCut = new TH2F | |
1c5acb87 | 139 | ("AnglePairNoCut", |
140 | "Angle between all #gamma pair vs E_{#pi^{0}}",fHistoNEBins,fHistoEMin,fHistoEMax,fHistoNAngleBins,fHistoAngleMin,fHistoAngleMax); | |
477d6cee | 141 | fhAnglePairNoCut->SetYTitle("Angle (rad)"); |
142 | fhAnglePairNoCut->SetXTitle("E_{ #pi^{0}} (GeV)"); | |
143 | ||
144 | fhAnglePairOpeningAngleCut = new TH2F | |
1c5acb87 | 145 | ("AnglePairOpeningAngleCut", |
146 | "Angle between all #gamma pair (opening angle + azimuth cut) vs E_{#pi^{0}}" | |
147 | ,fHistoNEBins,fHistoEMin,fHistoEMax,fHistoNAngleBins,fHistoAngleMin,fHistoAngleMax); | |
477d6cee | 148 | fhAnglePairOpeningAngleCut->SetYTitle("Angle (rad)"); |
149 | fhAnglePairOpeningAngleCut->SetXTitle("E_{ #pi^{0}} (GeV)"); | |
150 | ||
151 | fhAnglePairAllCut = new TH2F | |
1c5acb87 | 152 | ("AnglePairAllCut", |
153 | "Angle between all #gamma pair (opening angle + inv mass cut+azimuth) vs E_{#pi^{0}}" | |
154 | ,fHistoNEBins,fHistoEMin,fHistoEMax,fHistoNAngleBins,fHistoAngleMin,fHistoAngleMax); | |
477d6cee | 155 | fhAnglePairAllCut->SetYTitle("Angle (rad)"); |
156 | fhAnglePairAllCut->SetXTitle("E_{ #pi^{0}} (GeV)"); | |
157 | ||
158 | // | |
159 | fhInvMassPairNoCut = new TH2F | |
1c5acb87 | 160 | ("InvMassPairNoCut","Invariant Mass of all #gamma pair vs E_{#pi^{0}}", |
161 | fHistoNPtBins,fHistoPtMin,fHistoPtMax,fHistoNIMBins,fHistoIMMin,fHistoIMMax); | |
477d6cee | 162 | fhInvMassPairNoCut->SetYTitle("Invariant Mass (GeV/c^{2})"); |
163 | fhInvMassPairNoCut->SetXTitle("E_{ #pi^{0}} (GeV)"); | |
164 | ||
165 | fhInvMassPairOpeningAngleCut = new TH2F | |
1c5acb87 | 166 | ("InvMassPairOpeningAngleCut", |
167 | "Invariant Mass of #gamma pair (angle cut) vs E_{#pi^{0}}", | |
168 | fHistoNPtBins,fHistoPtMin,fHistoPtMax,fHistoNIMBins,fHistoIMMin,fHistoIMMax); | |
477d6cee | 169 | fhInvMassPairOpeningAngleCut->SetYTitle("Invariant Mass (GeV/c^{2})"); |
170 | fhInvMassPairOpeningAngleCut->SetXTitle(" E_{#pi^{0}}(GeV)"); | |
171 | ||
172 | fhInvMassPairAllCut = new TH2F | |
1c5acb87 | 173 | ("InvMassPairAllCut", |
174 | "Invariant Mass of #gamma pair (opening angle+invmass cut) vs E_{#pi^{0}}", | |
175 | fHistoNPtBins,fHistoPtMin,fHistoPtMax,fHistoNIMBins,fHistoIMMin,fHistoIMMax); | |
477d6cee | 176 | fhInvMassPairAllCut->SetYTitle("Invariant Mass (GeV/c^{2})"); |
177 | fhInvMassPairAllCut->SetXTitle("E_{#pi^{0}}(GeV)"); | |
178 | ||
179 | outputContainer->Add(fhAnglePairNoCut) ; | |
180 | outputContainer->Add(fhAnglePairOpeningAngleCut) ; | |
181 | outputContainer->Add(fhAnglePairAllCut) ; | |
182 | ||
183 | outputContainer->Add(fhInvMassPairNoCut) ; | |
184 | outputContainer->Add(fhInvMassPairOpeningAngleCut) ; | |
185 | outputContainer->Add(fhInvMassPairAllCut) ; | |
186 | ||
187 | return outputContainer; | |
1c5acb87 | 188 | } |
189 | ||
477d6cee | 190 | //____________________________________________________________________________ |
1c5acb87 | 191 | void AliNeutralMesonSelection::InitParameters() |
192 | { | |
477d6cee | 193 | |
1c5acb87 | 194 | //Initialize the parameters of the analysis. |
195 | fKeepNeutralMesonHistos = kFALSE ; | |
477d6cee | 196 | |
1c5acb87 | 197 | fAngleMaxParam.Set(4) ; |
198 | fAngleMaxParam.AddAt(0.4,0);//={0.4,-0.25,0.025,-2e-4}; | |
199 | fAngleMaxParam.AddAt(-0.25,1) ; | |
200 | fAngleMaxParam.AddAt(0.025,2) ; | |
201 | fAngleMaxParam.AddAt(-2e-4,3) ; | |
202 | ||
203 | fInvMassMaxCut = 0.16 ; | |
204 | fInvMassMinCut = 0.11 ; | |
205 | ||
206 | fM = 0.1349766;//neutralMeson mass, pi0 | |
207 | ||
208 | //Histogrammes settings | |
209 | fHistoNEBins = 100 ; | |
210 | fHistoEMax = 50 ; | |
211 | fHistoEMin = 0. ; | |
212 | ||
213 | fHistoNPtBins = 240 ; | |
214 | fHistoPtMax = 120 ; | |
215 | fHistoPtMin = 0. ; | |
216 | ||
217 | fHistoNAngleBins = 200 ; | |
218 | fHistoAngleMax = 0.2; | |
219 | fHistoAngleMin = 0. ; | |
220 | ||
221 | fHistoNIMBins = 300 ; | |
222 | fHistoIMMax = 0.5 ; | |
223 | fHistoIMMin = 0. ; | |
224 | } | |
225 | ||
226 | //__________________________________________________________________________- | |
227 | Bool_t AliNeutralMesonSelection::IsAngleInWindow(const Float_t angle,const Float_t e) const { | |
228 | //Check if the opening angle of the candidate pairs is inside | |
229 | //our selection windowd | |
230 | ||
231 | Bool_t result = kFALSE; | |
232 | Double_t max = fAngleMaxParam.At(0)*TMath::Exp(fAngleMaxParam.At(1)*e) | |
233 | +fAngleMaxParam.At(2)+fAngleMaxParam.At(3)*e; | |
234 | Double_t arg = (e*e-2*fM*fM)/(e*e); | |
235 | Double_t min = 100. ; | |
236 | if(arg>0.) | |
237 | min = TMath::ACos(arg); | |
238 | ||
239 | if((angle<max)&&(angle>=min)) | |
240 | result = kTRUE; | |
241 | ||
242 | return result; | |
243 | } | |
244 | ||
245 | //____________________________________________________________________________ | |
246 | Bool_t AliNeutralMesonSelection::SelectPair(TLorentzVector gammai, TLorentzVector gammaj) | |
247 | { | |
248 | ||
249 | //Search for the neutral pion within selection cuts | |
250 | Bool_t goodpair = kFALSE ; | |
251 | ||
477d6cee | 252 | // Double_t pt = (gammai+gammaj).Pt(); |
1c5acb87 | 253 | Double_t phi = (gammai+gammaj).Phi(); |
254 | if(phi < 0) | |
255 | phi+=TMath::TwoPi(); | |
256 | Double_t invmass = (gammai+gammaj).M(); | |
257 | Double_t angle = gammaj.Angle(gammai.Vect()); | |
258 | Double_t e = (gammai+gammaj).E(); | |
259 | ||
260 | //Fill histograms with no cuts applied. | |
261 | fhAnglePairNoCut->Fill(e,angle); | |
262 | fhInvMassPairNoCut->Fill(e,invmass); | |
263 | ||
264 | //Cut on the aperture of the pair | |
265 | if(IsAngleInWindow(angle,e)){ | |
266 | fhAnglePairOpeningAngleCut ->Fill(e,angle); | |
267 | fhInvMassPairOpeningAngleCut->Fill(e,invmass); | |
477d6cee | 268 | //AliDebug(2,Form("Angle cut: pt %f, phi %f",pt,phi)); |
1c5acb87 | 269 | |
270 | //Cut on the invariant mass of the pair | |
271 | if((invmass>fInvMassMinCut) && (invmass<fInvMassMaxCut)){ | |
272 | fhInvMassPairAllCut ->Fill(e,invmass); | |
273 | fhAnglePairAllCut ->Fill(e,angle); | |
274 | goodpair = kTRUE; | |
477d6cee | 275 | //AliDebug(2,Form("IM cut: pt %f, phi %f",pt,phi)); |
1c5acb87 | 276 | }//(invmass>0.125) && (invmass<0.145) |
277 | }//Opening angle cut | |
278 | ||
279 | return goodpair; | |
280 | ||
281 | } | |
282 | ||
283 | //__________________________________________________________________ | |
284 | void AliNeutralMesonSelection::Print(const Option_t * opt) const | |
285 | { | |
286 | ||
287 | //Print some relevant parameters set for the analysis | |
288 | if(! opt) | |
289 | return; | |
290 | ||
a3aebfff | 291 | printf("**** Print %s %s ****\n", GetName(), GetTitle() ) ; |
1c5acb87 | 292 | |
293 | printf("mass : %f \n", fM ); | |
294 | printf("Invariant mass limits : %f < m < %f \n", fInvMassMinCut , fInvMassMinCut ); | |
295 | printf("Angle selection param: \n"); | |
fbeaf916 | 296 | printf("p0 : %f\n", fAngleMaxParam.At(0)); |
297 | printf("p1 : %f\n", fAngleMaxParam.At(1)); | |
298 | printf("p2 : %f\n", fAngleMaxParam.At(2)); | |
299 | printf("p3 : %f\n", fAngleMaxParam.At(3)); | |
1c5acb87 | 300 | |
301 | printf("Keep Neutral Meson Histos = %d\n",fKeepNeutralMesonHistos); | |
302 | ||
303 | if(fKeepNeutralMesonHistos){ | |
477d6cee | 304 | printf("Histograms: %3.1f < E < %3.1f, Nbin = %d\n", fHistoEMin, fHistoEMax, fHistoNEBins); |
305 | printf("Histograms: %3.1f < pT < %3.1f, Nbin = %d\n", fHistoPtMin, fHistoPtMax, fHistoNPtBins); | |
306 | printf("Histograms: %3.1f < angle < %3.1f, Nbin = %d\n", fHistoAngleMin, fHistoAngleMax, fHistoNAngleBins); | |
307 | printf("Histograms: %3.1f < IM < %3.1f, Nbin = %d\n", fHistoIMMin, fHistoIMMax, fHistoNIMBins); | |
308 | ||
1c5acb87 | 309 | } |
477d6cee | 310 | |
1c5acb87 | 311 | } |