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bde49c8a | 1 | /************************************************************************* |
2 | * Copyright(c) 1998-2008, 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 | ||
410ff8cc | 16 | // --------------------------------------------------- |
17 | // MC event level cuts for azimuthal isotropic | |
18 | // expansion in highly central collisions analysis | |
19 | // author: Cristian ANDREI | |
20 | // acristian@niham.nipne.ro | |
21 | // ---------------------------------------------------- | |
22 | ||
bde49c8a | 23 | |
24 | #include <TParticle.h> | |
25 | ||
26 | #include "AliMCEvent.h" | |
27 | #include "AliStack.h" | |
28 | ||
29 | #include "AliAnalysisCentralCutEvtMC.h" | |
410ff8cc | 30 | |
31 | ||
32 | class TObject; | |
33 | ||
bde49c8a | 34 | //____________________________________________________________________ |
35 | ClassImp(AliAnalysisCentralCutEvtMC) | |
36 | ||
37 | //____________________________________________________________________ | |
38 | AliAnalysisCentralCutEvtMC::AliAnalysisCentralCutEvtMC(const Char_t* name, const Char_t* title) | |
39 | :AliAnalysisCuts(name,title) | |
40 | ,fReqMult(kFALSE) | |
41 | ,fReqDir(kFALSE) | |
42 | ,fReqDirUnit(kFALSE) | |
43 | ,fMultMin(0) | |
44 | ,fMultMax(0) | |
45 | ,fDirMin(0) | |
46 | ,fDirMax(0) | |
47 | ,fDirUMin(0) | |
48 | ,fDirUMax(0) | |
49 | ||
50 | { | |
51 | //constructor | |
0fb1f0cf | 52 | |
bde49c8a | 53 | } |
54 | ||
55 | AliAnalysisCentralCutEvtMC::~AliAnalysisCentralCutEvtMC(){ | |
56 | //destructor | |
0fb1f0cf | 57 | |
bde49c8a | 58 | } |
59 | ||
60 | //___________________________________________________________________________ | |
9eeae5d5 | 61 | Bool_t AliAnalysisCentralCutEvtMC::IsSelected(TObject *obj){ |
bde49c8a | 62 | // Checks whether the event passes the cuts |
63 | ||
64 | if (!obj){ | |
65 | printf("Pointer to MC Event is null! \n"); | |
66 | return kFALSE; | |
67 | } | |
68 | ||
69 | AliMCEvent *mcEvent = dynamic_cast<AliMCEvent*> (obj); | |
70 | if(!mcEvent){ | |
71 | printf("AliAnalysisCentralCutEvtMC -> Can't get MCEvt!\n"); | |
72 | return kFALSE; | |
73 | } | |
74 | ||
75 | ||
76 | if(fReqMult){ | |
77 | Int_t mult = CalcMult(mcEvent); | |
78 | if((mult<fMultMin)||(mult>fMultMax)){ | |
79 | return kFALSE; | |
80 | } | |
81 | } | |
82 | ||
83 | if(fReqDir){ | |
84 | Double_t dir = CalcDir(mcEvent); | |
85 | if((dir<fDirMin)||(dir>fDirMax)){ | |
86 | return kFALSE; | |
87 | } | |
88 | } | |
89 | ||
90 | if(fReqDirUnit){ | |
91 | Double_t dirU = CalcDirUnit(mcEvent); | |
92 | if((dirU<fDirUMin)||(dirU>fDirUMax)){ | |
93 | return kFALSE; | |
94 | } | |
95 | } | |
96 | ||
97 | return kTRUE; | |
98 | } | |
99 | ||
100 | //___________________________________________________________________________ | |
101 | Int_t AliAnalysisCentralCutEvtMC::CalcMult(AliMCEvent* const mcEvent) { | |
102 | // Computes the multiplicity of the event | |
103 | ||
104 | AliStack *stack=mcEvent->Stack(); | |
105 | if(!stack) return -1; | |
106 | ||
107 | Int_t nPrim = stack->GetNprimary(); | |
108 | ||
109 | Int_t charged = 0; | |
110 | Double_t eta; | |
111 | ||
112 | for(Int_t i = 0; i < nPrim; i++){//track loop -> compute multiplicity | |
113 | ||
114 | TParticle *particle=stack->Particle(i); | |
115 | if(!particle){ | |
116 | continue; | |
117 | } | |
118 | ||
119 | eta = particle->Eta(); | |
120 | ||
121 | if((eta > 0.5)||(eta < -0.5)){ //------------mid-rapidity | |
122 | continue; | |
123 | } | |
124 | ||
125 | TParticlePDG *particlePDG = particle->GetPDG(0); | |
126 | if(!particlePDG){ | |
127 | continue; | |
128 | } | |
129 | ||
130 | if(TMath::Abs(particlePDG->Charge()) < 3){ | |
131 | continue; | |
132 | } | |
133 | ||
134 | charged++; | |
135 | ||
136 | }//end track loop | |
137 | ||
138 | return charged; | |
139 | ||
140 | } | |
141 | ||
142 | //____________________________________________________________________________ | |
143 | Double_t AliAnalysisCentralCutEvtMC::CalcDir(AliMCEvent* const mcEvent) { | |
144 | // computes the directivity of the event | |
145 | ||
146 | AliStack *stack=mcEvent->Stack(); | |
147 | if(!stack) return -1; | |
148 | ||
149 | Int_t nPrim = stack->GetNprimary(); | |
150 | ||
151 | Int_t goodtrack = 0; | |
152 | ||
153 | Double_t eta; | |
154 | Double_t pt; | |
155 | ||
156 | Double_t dir; | |
157 | Double_t px,py; | |
158 | Double_t sumaPt = 0; | |
159 | Double_t sumaPx = 0; | |
160 | Double_t sumaPy = 0; | |
161 | ||
162 | for(Int_t i = 0; i < nPrim; i++){//track loop -> compute directivity | |
163 | ||
164 | TParticle *particle=stack->Particle(i); | |
165 | if(!particle){ | |
166 | continue; | |
167 | } | |
168 | ||
169 | eta = particle->Eta(); | |
170 | ||
171 | if((eta > 1.9)||(eta < 0.0)){ // half of the SPD coverage -> directivity | |
172 | continue; | |
173 | } | |
174 | ||
175 | TParticlePDG *particlePDG = particle->GetPDG(0); | |
176 | if(!particlePDG){ | |
177 | continue; | |
178 | } | |
179 | ||
180 | if(TMath::Abs(particlePDG->Charge()) < 3){ | |
181 | continue; | |
182 | } | |
183 | ||
184 | px = particle->Px(); | |
185 | py = particle->Py(); | |
186 | ||
187 | pt = particle->Pt(); | |
188 | ||
189 | sumaPx = sumaPx + px; | |
190 | sumaPy = sumaPy + py; | |
191 | ||
192 | sumaPt = sumaPt + pt; | |
193 | ||
194 | goodtrack++; | |
195 | ||
196 | }//end track loop | |
197 | ||
198 | ||
199 | if(sumaPt < 0.0000001){ | |
200 | return -1; | |
201 | } | |
202 | ||
203 | dir = (sqrt(pow(sumaPx,2)+pow(sumaPy,2)))/sumaPt; | |
204 | ||
205 | return dir; | |
206 | } | |
207 | ||
208 | //__________________________________________________________________ | |
209 | Double_t AliAnalysisCentralCutEvtMC::CalcDirUnit(AliMCEvent* const mcEvent) { | |
210 | // computes the directivity using only the SPD unity vectors | |
211 | ||
212 | AliStack *stack=mcEvent->Stack(); | |
213 | if(!stack){ | |
214 | return -1; | |
215 | } | |
216 | ||
217 | Int_t nPrim = stack->GetNprimary(); | |
218 | ||
219 | Int_t goodtrack = 0; | |
220 | ||
221 | Double_t eta; | |
222 | Double_t pt; | |
223 | ||
224 | Double_t dirU; | |
225 | Double_t px,py,pxU,pyU; | |
226 | Double_t sumaPxU = 0; | |
227 | Double_t sumaPyU = 0; | |
228 | ||
229 | ||
230 | for(Int_t i = 0; i < nPrim; i++){//track loop -> compute directivity | |
231 | ||
232 | TParticle *particle=stack->Particle(i); | |
233 | if(!particle){ | |
234 | continue; | |
235 | } | |
236 | ||
237 | eta = particle->Eta(); | |
238 | ||
239 | if((eta > 1.9)||(eta < 0.0)){ // half of the SPD coverage -> directivity | |
240 | continue; | |
241 | } | |
242 | ||
243 | TParticlePDG *particlePDG = particle->GetPDG(0); | |
244 | if(!particlePDG){ | |
245 | continue; | |
246 | } | |
247 | ||
248 | if(TMath::Abs(particlePDG->Charge()) < 3){ | |
249 | continue; | |
250 | } | |
251 | ||
252 | px = particle->Px(); | |
253 | py = particle->Py(); | |
254 | pt = particle->Pt(); | |
255 | ||
256 | pxU = px/pt; | |
257 | pyU = py/pt; | |
258 | ||
259 | sumaPxU = sumaPxU + pxU; | |
260 | sumaPyU = sumaPyU + pyU; | |
261 | ||
262 | goodtrack++; | |
263 | ||
264 | }//end track loop | |
265 | ||
266 | if(goodtrack == 0){ | |
267 | return -1; | |
268 | } | |
269 | ||
270 | dirU = (sqrt(pow(sumaPxU,2)+pow(sumaPyU,2)))/goodtrack; | |
271 | ||
272 | ||
273 | return dirU; | |
274 | } |