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b26900d0 | 1 | #include "AliFlowAnalysis.h" |
2 | //________________________________ | |
3 | /////////////////////////////////////////////////////////// | |
4 | // | |
5 | // class AliFlowAnalysis | |
6 | // | |
7 | // Flow Analysis | |
8 | // | |
9 | // | |
10 | // S.Radomski@gsi.de | |
11 | // Piotr.Skowronski@cern.ch | |
12 | // | |
13 | /////////////////////////////////////////////////////////// | |
14 | /*********************************************************/ | |
15 | ||
16 | #include <TString.h> | |
17 | #include <TParticle.h> | |
18 | ||
19 | #include <AliStack.h> | |
a5556ea5 | 20 | #include <AliAOD.h> |
afa8b37b | 21 | #include <AliVAODParticle.h> |
a5556ea5 | 22 | #include <AliAODParticleCut.h> |
23 | ||
b26900d0 | 24 | #include <AliESDtrack.h> |
25 | #include <AliESD.h> | |
26 | ||
27 | ClassImp(AliFlowAnalysis) | |
28 | ||
a5556ea5 | 29 | AliFlowAnalysis::AliFlowAnalysis(): |
30 | fPartCut(0x0) | |
31 | { | |
32 | //ctor | |
33 | } | |
34 | /*********************************************************/ | |
35 | ||
36 | AliFlowAnalysis::~AliFlowAnalysis() | |
37 | { | |
38 | //dtor | |
39 | delete fPartCut; | |
40 | } | |
41 | /*********************************************************/ | |
42 | ||
b26900d0 | 43 | Int_t AliFlowAnalysis::Init() |
44 | { | |
45 | //Initilizes anaysis | |
46 | Info("Init",""); | |
47 | return 0; | |
48 | } | |
b26900d0 | 49 | /*********************************************************/ |
50 | ||
a5556ea5 | 51 | Int_t AliFlowAnalysis::ProcessEvent(AliAOD* aodrec, AliAOD* aodsim) |
b26900d0 | 52 | { |
53 | ||
a5556ea5 | 54 | Info("ProcessEvent","Sim AOD address %#x",aodsim); |
55 | Double_t psi = 0, v2 = 0; | |
56 | if (aodrec) | |
57 | { | |
58 | GetFlow(aodrec,v2,psi); | |
59 | Info("ProcessEvent","Reconstructed Event: Event plane is %f, V2 is %f",psi,v2); | |
60 | } | |
61 | ||
62 | if (aodsim) | |
63 | { | |
64 | GetFlow(aodsim,v2,psi); | |
65 | Info("ProcessEvent","Simulated Event: Event plane is %f, V2 is %f",psi,v2); | |
66 | } | |
67 | ||
b26900d0 | 68 | return 0; |
69 | ||
70 | } | |
71 | /*********************************************************/ | |
72 | ||
73 | Int_t AliFlowAnalysis::Finish() | |
74 | { | |
75 | //Finish analysis and writes results | |
76 | Info("Init","Finish"); | |
77 | return 0; | |
78 | } | |
79 | /*********************************************************/ | |
80 | ||
a5556ea5 | 81 | Double_t AliFlowAnalysis::GetEventPlane(AliAOD* aod) |
82 | { | |
83 | //returns event plane in degrees | |
84 | if (aod == 0x0) | |
85 | { | |
86 | Error("AliFlowAnalysis::GetFlow","Pointer to AOD is NULL"); | |
87 | return -1.0; | |
88 | } | |
89 | ||
90 | Double_t psi; | |
91 | Int_t mult = aod->GetNumberOfParticles(); | |
92 | ||
93 | Double_t ssin = 0, scos = 0; | |
94 | ||
95 | for (Int_t i=0; i<mult; i++) | |
96 | { | |
afa8b37b | 97 | AliVAODParticle* aodtrack = aod->GetParticle(i); |
a5556ea5 | 98 | if (aodtrack == 0x0) |
99 | { | |
100 | Error("AliFlowAnalysis::GetEventPlane","Can not get track %d", i); | |
101 | continue; | |
102 | } | |
103 | ||
104 | if (fPartCut) | |
cea0a066 | 105 | if (fPartCut->Rejected(aodtrack)) |
a5556ea5 | 106 | continue; |
107 | ||
108 | Double_t phi = TMath::Pi()+TMath::ATan2(-aodtrack->Py(),-aodtrack->Px()); | |
109 | ||
110 | ssin += TMath::Sin( 2.0 * phi ); | |
111 | scos += TMath::Cos( 2.0 * phi ); | |
112 | } | |
113 | ||
114 | psi = atan2 (ssin, scos) / 2.0; | |
115 | psi = psi * 180. / TMath::Pi(); | |
116 | ||
117 | return psi; | |
118 | ||
119 | } | |
120 | /*********************************************************/ | |
121 | ||
122 | void AliFlowAnalysis::GetFlow(AliAOD* aod,Double_t& v2,Double_t& psi) | |
123 | { | |
124 | //returns flow parameters: v2 and event plane | |
125 | if (aod == 0x0) | |
126 | { | |
127 | Error("AliFlowAnalysis::GetFlow","Pointer to AOD is NULL"); | |
128 | return; | |
129 | } | |
130 | ||
131 | psi = GetEventPlane(aod); | |
132 | Int_t mult = aod->GetNumberOfParticles(); | |
133 | ||
134 | Double_t ssin = 0, scos = 0; | |
135 | ||
136 | for (Int_t i=0; i<mult; i++) | |
137 | { | |
afa8b37b | 138 | AliVAODParticle* aodtrack = aod->GetParticle(i); |
a5556ea5 | 139 | if (aodtrack == 0x0) |
140 | { | |
141 | Error("AliFlowAnalysis::GetEventPlane","Can not get track %d", i); | |
142 | continue; | |
143 | } | |
144 | if (fPartCut) | |
cea0a066 | 145 | if (fPartCut->Rejected(aodtrack)) |
a5556ea5 | 146 | continue; |
147 | ||
148 | Double_t phi = TMath::Pi()+TMath::ATan2(-aodtrack->Py(),-aodtrack->Px()); | |
149 | ssin += TMath::Sin( 2.0 * (phi - psi)); | |
150 | scos += TMath::Cos( 2.0 * (phi - psi)); | |
151 | } | |
152 | ||
153 | v2 = TMath::Hypot(ssin,scos); | |
154 | } | |
155 | ||
156 | ||
157 | /*********************************************************/ | |
158 | ||
b26900d0 | 159 | Double_t AliFlowAnalysis::GetEventPlane(AliESD* esd) |
160 | { | |
161 | //returns event plane | |
e6577ac7 | 162 | if (esd == 0x0) |
163 | { | |
a5556ea5 | 164 | ::Error("AliFlowAnalysis::GetFlow","Pointer to ESD is NULL"); |
e6577ac7 | 165 | return -1.0; |
166 | } | |
167 | ||
b26900d0 | 168 | Double_t psi; |
169 | Int_t mult = esd->GetNumberOfTracks(); | |
170 | ||
171 | Double_t ssin = 0, scos = 0; | |
172 | ||
173 | for (Int_t i=0; i<mult; i++) | |
174 | { | |
175 | AliESDtrack* esdtrack = esd->GetTrack(i); | |
176 | if (esdtrack == 0x0) | |
177 | { | |
a5556ea5 | 178 | ::Error("AliFlowAnalysis::GetEventPlane","Can not get track %d", i); |
b26900d0 | 179 | continue; |
180 | } | |
181 | ||
182 | Double_t mom[3];//momentum | |
183 | esdtrack->GetPxPyPz(mom); | |
184 | Double_t phi = TMath::Pi()+TMath::ATan2(-mom[1],-mom[0]); | |
185 | ||
186 | ssin += TMath::Sin( 2.0 * phi ); | |
187 | scos += TMath::Cos( 2.0 * phi ); | |
188 | } | |
189 | ||
190 | psi = atan2 (ssin, scos) / 2.0; | |
191 | psi = psi * 180. / TMath::Pi(); | |
192 | ||
193 | return psi; | |
194 | ||
195 | } | |
a5556ea5 | 196 | /*********************************************************/ |
e6577ac7 | 197 | |
198 | void AliFlowAnalysis::GetFlow(AliESD* esd,Double_t& v2,Double_t& psi) | |
199 | { | |
200 | //returns flow parameters: v2 and event plane | |
201 | if (esd == 0x0) | |
202 | { | |
a5556ea5 | 203 | ::Error("AliFlowAnalysis::GetFlow","Pointer to ESD is NULL"); |
e6577ac7 | 204 | return; |
205 | } | |
206 | ||
207 | psi = GetEventPlane(esd); | |
208 | Int_t mult = esd->GetNumberOfTracks(); | |
209 | ||
210 | Double_t ssin = 0, scos = 0; | |
211 | ||
212 | for (Int_t i=0; i<mult; i++) | |
213 | { | |
214 | AliESDtrack* esdtrack = esd->GetTrack(i); | |
215 | if (esdtrack == 0x0) | |
216 | { | |
a5556ea5 | 217 | ::Error("AliFlowAnalysis::GetEventPlane","Can not get track %d", i); |
e6577ac7 | 218 | continue; |
219 | } | |
220 | ||
221 | Double_t mom[3];//momentum | |
222 | esdtrack->GetPxPyPz(mom); | |
223 | Double_t phi = TMath::Pi()+TMath::ATan2(-mom[1],-mom[0]); | |
224 | ||
225 | ssin += TMath::Sin( 2.0 * (phi - psi)); | |
226 | scos += TMath::Cos( 2.0 * (phi - psi)); | |
227 | } | |
228 | ||
229 | v2 = TMath::Hypot(ssin,scos); | |
230 | } | |
a5556ea5 | 231 | /*********************************************************/ |