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bdcfac30 | 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 | ||
bdcfac30 | 17 | //_________________________________________________________________________ |
18 | // Class that contains methods to select candidate pairs to neutral meson | |
3bb2c538 | 19 | // 2 main selections, invariant mass around pi0 (also any other mass), |
20 | // apperture angle to distinguish from combinatorial. | |
bdcfac30 | 21 | //-- Author: Gustavo Conesa (INFN-LNF) |
22 | ||
23 | // --- ROOT system --- | |
bdcfac30 | 24 | #include <TLorentzVector.h> |
25 | #include <TH2.h> | |
26 | #include <TList.h> | |
3bb2c538 | 27 | #include <TArrayD.h> |
28 | ||
bdcfac30 | 29 | //---- AliRoot system ---- |
30 | #include "AliNeutralMesonSelection.h" | |
bdcfac30 | 31 | #include "AliLog.h" |
32 | ||
33 | ClassImp(AliNeutralMesonSelection) | |
34 | ||
35 | ||
36 | //____________________________________________________________________________ | |
37 | AliNeutralMesonSelection::AliNeutralMesonSelection() : | |
2c8efea8 | 38 | TObject(), fM(0), |
bdcfac30 | 39 | fInvMassMaxCut(0.), fInvMassMinCut(0.), |
2cc4014d | 40 | fAngleMaxParam(), fKeepNeutralMesonHistos(0), |
41 | fhAnglePairNoCut(0), fhAnglePairOpeningAngleCut(0), | |
42 | fhAnglePairAllCut(0), | |
2c8efea8 | 43 | fhInvMassPairNoCut(0), fhInvMassPairOpeningAngleCut(0), |
44 | fhInvMassPairAllCut(0) | |
bdcfac30 | 45 | { |
46 | //Default Ctor | |
47 | ||
48 | //Initialize parameters | |
49 | ||
50 | // kGammaHadron and kGammaJet | |
51 | fAngleMaxParam.Set(4) ; | |
52 | fAngleMaxParam.Reset(0.); | |
53 | ||
54 | //Initialize parameters | |
55 | InitParameters(); | |
56 | } | |
57 | ||
58 | //____________________________________________________________________________ | |
59 | AliNeutralMesonSelection::AliNeutralMesonSelection(const AliNeutralMesonSelection & g) : | |
2c8efea8 | 60 | TObject(), fM(g.fM), |
bdcfac30 | 61 | fInvMassMaxCut(g.fInvMassMaxCut), fInvMassMinCut(g.fInvMassMinCut), |
2c8efea8 | 62 | fAngleMaxParam(g.fAngleMaxParam), |
bdcfac30 | 63 | fKeepNeutralMesonHistos(g.fKeepNeutralMesonHistos), |
64 | fhAnglePairNoCut(g. fhAnglePairNoCut), | |
bdcfac30 | 65 | fhAnglePairOpeningAngleCut(g. fhAnglePairOpeningAngleCut), |
66 | fhAnglePairAllCut(g. fhAnglePairAllCut), | |
67 | fhInvMassPairNoCut(g.fhInvMassPairNoCut), | |
bdcfac30 | 68 | fhInvMassPairOpeningAngleCut(g.fhInvMassPairOpeningAngleCut), |
69 | fhInvMassPairAllCut(g.fhInvMassPairAllCut) | |
70 | { | |
71 | // cpy ctor | |
72 | } | |
73 | ||
74 | //_________________________________________________________________________ | |
75 | AliNeutralMesonSelection & AliNeutralMesonSelection::operator = (const AliNeutralMesonSelection & source) | |
76 | { | |
77 | // assignment operator | |
78 | ||
79 | if(this == &source)return *this; | |
80 | ((TObject *)this)->operator=(source); | |
81 | ||
bdcfac30 | 82 | fM = source.fM ; |
83 | fInvMassMaxCut = source.fInvMassMaxCut ; | |
84 | fInvMassMinCut = source.fInvMassMinCut ; | |
85 | fAngleMaxParam = source.fAngleMaxParam ; | |
bdcfac30 | 86 | fKeepNeutralMesonHistos = source.fKeepNeutralMesonHistos; |
87 | ||
88 | fhAnglePairNoCut = source. fhAnglePairNoCut ; | |
bdcfac30 | 89 | fhAnglePairOpeningAngleCut = source. fhAnglePairOpeningAngleCut ; |
90 | fhAnglePairAllCut = source. fhAnglePairAllCut ; | |
91 | fhInvMassPairNoCut = source.fhInvMassPairNoCut ; | |
bdcfac30 | 92 | fhInvMassPairOpeningAngleCut = source.fhInvMassPairOpeningAngleCut ; |
93 | fhInvMassPairAllCut = source.fhInvMassPairAllCut ; | |
94 | ||
95 | return *this; | |
96 | ||
97 | } | |
98 | ||
99 | //____________________________________________________________________________ | |
100 | AliNeutralMesonSelection::~AliNeutralMesonSelection() | |
101 | { | |
2c8efea8 | 102 | //dtor |
bdcfac30 | 103 | |
2c8efea8 | 104 | if(!fKeepNeutralMesonHistos){ |
105 | //Histograms initialized and filled but not passed to output container | |
106 | //delete here, I am not sure this is correct | |
107 | ||
108 | if(fhAnglePairNoCut) delete fhAnglePairNoCut; | |
109 | if(fhAnglePairOpeningAngleCut) delete fhAnglePairOpeningAngleCut; | |
110 | if(fhAnglePairAllCut) delete fhAnglePairAllCut; | |
111 | if(fhInvMassPairNoCut) delete fhInvMassPairNoCut; | |
112 | if(fhInvMassPairOpeningAngleCut) delete fhInvMassPairOpeningAngleCut; | |
113 | if(fhInvMassPairAllCut) delete fhInvMassPairAllCut; | |
bdcfac30 | 114 | |
2c8efea8 | 115 | } |
116 | ||
117 | } | |
bdcfac30 | 118 | //________________________________________________________________________ |
119 | TList * AliNeutralMesonSelection::GetCreateOutputObjects() | |
120 | { | |
121 | ||
122 | // Create histograms to be saved in output file and | |
2c8efea8 | 123 | // store them in outputContainer of the analysis class that calls this class. |
124 | ||
bdcfac30 | 125 | TList * outputContainer = new TList() ; |
126 | outputContainer->SetName("MesonDecayHistos") ; | |
127 | ||
128 | fhAnglePairNoCut = new TH2F | |
129 | ("AnglePairNoCut", | |
130 | "Angle between all #gamma pair vs E_{#pi^{0}}",200,0,50,200,0,0.2); | |
131 | fhAnglePairNoCut->SetYTitle("Angle (rad)"); | |
132 | fhAnglePairNoCut->SetXTitle("E_{ #pi^{0}} (GeV)"); | |
133 | ||
134 | fhAnglePairOpeningAngleCut = new TH2F | |
135 | ("AnglePairOpeningAngleCut", | |
136 | "Angle between all #gamma pair (opening angle + azimuth cut) vs E_{#pi^{0}}" | |
137 | ,200,0,50,200,0,0.2); | |
138 | fhAnglePairOpeningAngleCut->SetYTitle("Angle (rad)"); | |
139 | fhAnglePairOpeningAngleCut->SetXTitle("E_{ #pi^{0}} (GeV)"); | |
140 | ||
141 | fhAnglePairAllCut = new TH2F | |
142 | ("AnglePairAllCut", | |
143 | "Angle between all #gamma pair (opening angle + inv mass cut+azimuth) vs E_{#pi^{0}}" | |
144 | ,200,0,50,200,0,0.2); | |
145 | fhAnglePairAllCut->SetYTitle("Angle (rad)"); | |
146 | fhAnglePairAllCut->SetXTitle("E_{ #pi^{0}} (GeV)"); | |
147 | ||
148 | // | |
149 | fhInvMassPairNoCut = new TH2F | |
150 | ("InvMassPairNoCut","Invariant Mass of all #gamma pair vs E_{#pi^{0}}", | |
151 | 120,0,120,360,0,0.5); | |
152 | fhInvMassPairNoCut->SetYTitle("Invariant Mass (GeV/c^{2})"); | |
153 | fhInvMassPairNoCut->SetXTitle("E_{ #pi^{0}} (GeV)"); | |
154 | ||
155 | fhInvMassPairOpeningAngleCut = new TH2F | |
156 | ("InvMassPairOpeningAngleCut", | |
157 | "Invariant Mass of #gamma pair (angle cut) vs E_{#pi^{0}}", | |
158 | 120,0,120,360,0,0.5); | |
159 | fhInvMassPairOpeningAngleCut->SetYTitle("Invariant Mass (GeV/c^{2})"); | |
160 | fhInvMassPairOpeningAngleCut->SetXTitle(" E_{#pi^{0}}(GeV)"); | |
161 | ||
162 | fhInvMassPairAllCut = new TH2F | |
163 | ("InvMassPairAllCut", | |
164 | "Invariant Mass of #gamma pair (opening angle+invmass cut) vs E_{#pi^{0}}", | |
165 | 120,0,120,360,0,0.5); | |
166 | fhInvMassPairAllCut->SetYTitle("Invariant Mass (GeV/c^{2})"); | |
167 | fhInvMassPairAllCut->SetXTitle("E_{#pi^{0}}(GeV)"); | |
168 | ||
bdcfac30 | 169 | outputContainer->Add(fhAnglePairNoCut) ; |
170 | outputContainer->Add(fhAnglePairOpeningAngleCut) ; | |
171 | outputContainer->Add(fhAnglePairAllCut) ; | |
172 | ||
173 | outputContainer->Add(fhInvMassPairNoCut) ; | |
174 | outputContainer->Add(fhInvMassPairOpeningAngleCut) ; | |
175 | outputContainer->Add(fhInvMassPairAllCut) ; | |
bdcfac30 | 176 | |
177 | return outputContainer; | |
178 | } | |
179 | ||
180 | //____________________________________________________________________________ | |
181 | void AliNeutralMesonSelection::InitParameters() | |
182 | { | |
183 | ||
184 | //Initialize the parameters of the analysis. | |
2c8efea8 | 185 | fKeepNeutralMesonHistos = kFALSE ; |
bdcfac30 | 186 | |
187 | //-------------kHadron, kJetLeadCone----------------- | |
188 | fAngleMaxParam.Set(4) ; | |
189 | fAngleMaxParam.AddAt(0.4,0);//={0.4,-0.25,0.025,-2e-4}; | |
190 | fAngleMaxParam.AddAt(-0.25,1) ; | |
191 | fAngleMaxParam.AddAt(0.025,2) ; | |
192 | fAngleMaxParam.AddAt(-2e-4,3) ; | |
193 | ||
194 | fInvMassMaxCut = 0.16 ; | |
195 | fInvMassMinCut = 0.11 ; | |
196 | ||
197 | fM = 0.1349766;//neutralMeson mass | |
bdcfac30 | 198 | } |
199 | ||
200 | //__________________________________________________________________________- | |
3bb2c538 | 201 | Bool_t AliNeutralMesonSelection::IsAngleInWindow(const Float_t angle,const Float_t e) const { |
bdcfac30 | 202 | //Check if the opening angle of the candidate pairs is inside |
203 | //our selection windowd | |
204 | ||
205 | Bool_t result = kFALSE; | |
206 | Double_t max = fAngleMaxParam.At(0)*TMath::Exp(fAngleMaxParam.At(1)*e) | |
207 | +fAngleMaxParam.At(2)+fAngleMaxParam.At(3)*e; | |
208 | Double_t arg = (e*e-2*fM*fM)/(e*e); | |
209 | Double_t min = 100. ; | |
210 | if(arg>0.) | |
211 | min = TMath::ACos(arg); | |
212 | ||
213 | if((angle<max)&&(angle>=min)) | |
214 | result = kTRUE; | |
215 | ||
216 | return result; | |
217 | } | |
218 | ||
219 | //____________________________________________________________________________ | |
2c8efea8 | 220 | Bool_t AliNeutralMesonSelection::SelectPair(TLorentzVector gammai, TLorentzVector gammaj) |
bdcfac30 | 221 | { |
222 | ||
223 | //Search for the neutral pion within selection cuts | |
bdcfac30 | 224 | Bool_t goodpair = kFALSE ; |
225 | ||
226 | Double_t pt = (gammai+gammaj).Pt(); | |
227 | Double_t phi = (gammai+gammaj).Phi(); | |
228 | if(phi < 0) | |
229 | phi+=TMath::TwoPi(); | |
230 | Double_t invmass = (gammai+gammaj).M(); | |
231 | Double_t angle = gammaj.Angle(gammai.Vect()); | |
232 | Double_t e = (gammai+gammaj).E(); | |
233 | ||
234 | //Fill histograms with no cuts applied. | |
235 | fhAnglePairNoCut->Fill(e,angle); | |
236 | fhInvMassPairNoCut->Fill(e,invmass); | |
bdcfac30 | 237 | |
2c8efea8 | 238 | //Cut on the aperture of the pair |
239 | if(IsAngleInWindow(angle,e)){ | |
240 | fhAnglePairOpeningAngleCut ->Fill(e,angle); | |
241 | fhInvMassPairOpeningAngleCut->Fill(e,invmass); | |
242 | AliDebug(2,Form("Angle cut: pt %f, phi %f",pt,phi)); | |
bdcfac30 | 243 | |
2c8efea8 | 244 | //Cut on the invariant mass of the pair |
245 | if((invmass>fInvMassMinCut) && (invmass<fInvMassMaxCut)){ | |
246 | fhInvMassPairAllCut ->Fill(e,invmass); | |
247 | fhAnglePairAllCut ->Fill(e,angle); | |
248 | goodpair = kTRUE; | |
249 | AliDebug(2,Form("IM cut: pt %f, phi %f",pt,phi)); | |
250 | }//(invmass>0.125) && (invmass<0.145) | |
251 | }//Opening angle cut | |
bdcfac30 | 252 | |
253 | return goodpair; | |
254 | ||
255 | } | |
256 | ||
257 | //__________________________________________________________________ | |
258 | void AliNeutralMesonSelection::Print(const Option_t * opt) const | |
259 | { | |
260 | ||
261 | //Print some relevant parameters set for the analysis | |
262 | if(! opt) | |
263 | return; | |
264 | ||
265 | Info("Print", "%s %s", GetName(), GetTitle() ) ; | |
266 | ||
267 | printf("mass : %f \n", fM ); | |
268 | printf("Invariant mass limits : %f < m < %f \n", fInvMassMinCut , fInvMassMinCut ); | |
269 | printf("Angle selection param: \n"); | |
270 | printf("p0 : %f", fAngleMaxParam.At(0)); | |
271 | printf("p1 : %f", fAngleMaxParam.At(1)); | |
272 | printf("p2 : %f", fAngleMaxParam.At(2)); | |
273 | printf("p3 : %f", fAngleMaxParam.At(3)); | |
274 | ||
bdcfac30 | 275 | printf("Keep Neutral Meson Histos = %d\n",fKeepNeutralMesonHistos); |
276 | ||
277 | } |