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1 | /************************************************************************** | |
2 | * Copyright(c) 1998-2003, 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 | ||
16 | //----------------------------------------------------------------- | |
17 | // Implementation of the Primary Vertex class | |
18 | // | |
19 | // Origin: A.Dainese, Padova, andrea.dainese@pd.infn.it | |
20 | //----------------------------------------------------------------- | |
21 | ||
22 | //---- standard headers ---- | |
23 | #include "Riostream.h" | |
24 | //---- Root headers -------- | |
25 | #include <TMath.h> | |
26 | #include <TROOT.h> | |
27 | #include <TNamed.h> | |
28 | //---- AliRoot headers ----- | |
29 | #include "AliITSVertex.h" | |
30 | ||
31 | ||
32 | ClassImp(AliITSVertex) | |
33 | ||
34 | //-------------------------------------------------------------------------- | |
35 | AliITSVertex::AliITSVertex() { | |
36 | // | |
37 | // Default Constructor, set everything to 0 | |
38 | // | |
39 | SetToZero(); | |
40 | } | |
41 | //-------------------------------------------------------------------------- | |
42 | AliITSVertex::AliITSVertex(Double_t positionZ,Double_t sigmaZ, | |
43 | Int_t nContributors,Char_t *vtxName) { | |
44 | // | |
45 | // Constructor for vertex Z from pixels | |
46 | // | |
47 | ||
48 | SetToZero(); | |
49 | ||
50 | fPosition[2] = positionZ; | |
51 | fCovZZ = sigmaZ*sigmaZ; | |
52 | fNContributors = nContributors; | |
53 | SetName(vtxName); | |
54 | ||
55 | } | |
56 | //------------------------------------------------------------------------- | |
57 | AliITSVertex::AliITSVertex(Double_t phi, | |
58 | Double_t position[3],Double_t covmatrix[6], | |
59 | Double_t chi2,Int_t nContributors,Char_t *vtxName) { | |
60 | // | |
61 | // Constructor for vertex in 3D from tracks | |
62 | // | |
63 | ||
64 | SetToZero(); | |
65 | fPosition[0] = position[0]; | |
66 | fPosition[1] = position[1]; | |
67 | fPosition[2] = position[2]; | |
68 | fCovXX = covmatrix[0]; | |
69 | fCovXY = covmatrix[1]; | |
70 | fCovYY = covmatrix[2]; | |
71 | fCovXZ = covmatrix[3]; | |
72 | fCovYZ = covmatrix[4]; | |
73 | fCovZZ = covmatrix[5]; | |
74 | ||
75 | ||
76 | fPhi = phi; | |
77 | fChi2 = chi2; | |
78 | fNContributors = nContributors; | |
79 | ||
80 | SetName(vtxName); | |
81 | ||
82 | } | |
83 | //-------------------------------------------------------------------------- | |
84 | AliITSVertex::AliITSVertex(Double_t position[3],Double_t sigma[3], | |
85 | Char_t *vtxName) { | |
86 | // | |
87 | // Constructor for smearing of true position | |
88 | // | |
89 | ||
90 | SetToZero(); | |
91 | fPosition[0] = position[0]; | |
92 | fPosition[1] = position[1]; | |
93 | fPosition[2] = position[2]; | |
94 | fCovXX = sigma[0]*sigma[0]; | |
95 | fCovXY = 0; | |
96 | fCovYY = sigma[1]*sigma[1]; | |
97 | fCovXZ = 0; | |
98 | fCovYZ = 0; | |
99 | fCovZZ = sigma[2]*sigma[2]; | |
100 | ||
101 | ||
102 | SetName(vtxName); | |
103 | ||
104 | } | |
105 | //-------------------------------------------------------------------------- | |
106 | AliITSVertex::AliITSVertex(Double_t position[3],Double_t sigma[3], | |
107 | Double_t snr[3],Char_t *vtxName) { | |
108 | // | |
109 | // Constructor for Pb-Pb | |
110 | // | |
111 | ||
112 | SetToZero(); | |
113 | fPosition[0] = position[0]; | |
114 | fPosition[1] = position[1]; | |
115 | fPosition[2] = position[2]; | |
116 | fCovXX = sigma[0]*sigma[0]; | |
117 | fCovXY = 0; | |
118 | fCovYY = sigma[1]*sigma[1]; | |
119 | fCovXZ = 0; | |
120 | fCovYZ = 0; | |
121 | fCovZZ = sigma[2]*sigma[2]; | |
122 | ||
123 | fSNR[0] = snr[0]; | |
124 | fSNR[1] = snr[1]; | |
125 | fSNR[2] = snr[2]; | |
126 | ||
127 | SetName(vtxName); | |
128 | ||
129 | } | |
130 | //-------------------------------------------------------------------------- | |
131 | void AliITSVertex::SetToZero() { | |
132 | // | |
133 | // Set some data members to 0. Used by constructors | |
134 | // | |
135 | for(Int_t i=0; i<3; i++){ | |
136 | fPosition[i] = 0.; | |
137 | fTruePos[i] = 0; | |
138 | fSNR[i] = 0.; | |
139 | } | |
140 | fCovXX = 0; | |
141 | fCovXY = 0; | |
142 | fCovYY = 0; | |
143 | fCovXZ = 0; | |
144 | fCovYZ = 0; | |
145 | fCovZZ = 0; | |
146 | ||
147 | fPhi = 0; | |
148 | fChi2 = 0; | |
149 | fNContributors = 0; | |
150 | ||
151 | SetDebug(); | |
152 | } | |
153 | //-------------------------------------------------------------------------- | |
154 | AliITSVertex::~AliITSVertex() { | |
155 | // | |
156 | // Default Destructor | |
157 | // | |
158 | ||
159 | } | |
160 | //-------------------------------------------------------------------------- | |
161 | void AliITSVertex::GetXYZ(Double_t position[3]) const { | |
162 | // | |
163 | // Return position of the vertex in global frame | |
164 | // | |
165 | position[0] = fPosition[0]*TMath::Cos(fPhi)-fPosition[1]*TMath::Sin(fPhi); | |
166 | position[1] = fPosition[0]*TMath::Sin(fPhi)+fPosition[1]*TMath::Cos(fPhi); | |
167 | position[2] = fPosition[2]; | |
168 | ||
169 | return; | |
170 | } | |
171 | //-------------------------------------------------------------------------- | |
172 | void AliITSVertex::GetXYZ_ThrustFrame(Double_t position[3]) const { | |
173 | // | |
174 | // Return position of the vertex in thrust frame | |
175 | // | |
176 | position[0] = fPosition[0]; | |
177 | position[1] = fPosition[1]; | |
178 | position[2] = fPosition[2]; | |
179 | ||
180 | return; | |
181 | } | |
182 | //-------------------------------------------------------------------------- | |
183 | void AliITSVertex::GetSigmaXYZ(Double_t sigma[3]) const { | |
184 | // | |
185 | // Return errors on vertex position in global frame | |
186 | // | |
187 | Double_t cm[6]; | |
188 | GetCovMatrix(cm); | |
189 | sigma[0] = TMath::Sqrt(cm[0]); | |
190 | sigma[1] = TMath::Sqrt(cm[2]); | |
191 | sigma[2] = TMath::Sqrt(cm[5]); | |
192 | ||
193 | return; | |
194 | } | |
195 | //-------------------------------------------------------------------------- | |
196 | void AliITSVertex::GetSigmaXYZ_ThrustFrame(Double_t sigma[3]) const { | |
197 | // | |
198 | // Return errors on vertex position in thrust frame | |
199 | // | |
200 | sigma[0] = TMath::Sqrt(fCovXX); | |
201 | sigma[1] = TMath::Sqrt(fCovYY); | |
202 | sigma[2] = TMath::Sqrt(fCovZZ); | |
203 | ||
204 | return; | |
205 | } | |
206 | //-------------------------------------------------------------------------- | |
207 | void AliITSVertex::GetCovMatrix(Double_t covmatrix[6]) const { | |
208 | // | |
209 | // Return covariance matrix of the vertex | |
210 | // | |
211 | Double_t cPhi = TMath::Cos(fPhi); | |
212 | Double_t sPhi = TMath::Sin(fPhi); | |
213 | ||
214 | covmatrix[0] = fCovXX*cPhi*cPhi-2.*fCovXY*cPhi*sPhi+fCovYY*sPhi*sPhi; | |
215 | covmatrix[1] = (fCovXX-fCovYY)*cPhi*sPhi+fCovXY*(cPhi*cPhi-sPhi*sPhi); | |
216 | covmatrix[2] = fCovXX*sPhi*sPhi+2.*fCovXY*cPhi*sPhi+fCovYY*cPhi*cPhi; | |
217 | covmatrix[3] = fCovXZ*cPhi-fCovYZ*sPhi; | |
218 | covmatrix[4] = fCovXZ*sPhi+fCovYZ*cPhi; | |
219 | covmatrix[5] = fCovZZ; | |
220 | ||
221 | return; | |
222 | } | |
223 | //-------------------------------------------------------------------------- | |
224 | void AliITSVertex::GetCovMatrix_ThrustFrame(Double_t covmatrix[6]) const { | |
225 | // | |
226 | // Return covariance matrix of the vertex | |
227 | // | |
228 | covmatrix[0] = fCovXX; | |
229 | covmatrix[1] = fCovXY; | |
230 | covmatrix[2] = fCovYY; | |
231 | covmatrix[3] = fCovXZ; | |
232 | covmatrix[4] = fCovYZ; | |
233 | covmatrix[5] = fCovZZ; | |
234 | ||
235 | return; | |
236 | } | |
237 | //-------------------------------------------------------------------------- | |
238 | Double_t AliITSVertex::GetXv() const { | |
239 | // | |
240 | // Return global x | |
241 | // | |
242 | return fPosition[0]*TMath::Cos(fPhi)-fPosition[1]*TMath::Sin(fPhi); | |
243 | } | |
244 | //-------------------------------------------------------------------------- | |
245 | Double_t AliITSVertex::GetYv() const { | |
246 | // | |
247 | // Return global y | |
248 | // | |
249 | return fPosition[0]*TMath::Sin(fPhi)+fPosition[1]*TMath::Cos(fPhi); | |
250 | } | |
251 | //-------------------------------------------------------------------------- | |
252 | Double_t AliITSVertex::GetZv() const { | |
253 | // | |
254 | // Return global z | |
255 | // | |
256 | return fPosition[2]; | |
257 | } | |
258 | //-------------------------------------------------------------------------- | |
259 | Double_t AliITSVertex::GetXRes() const { | |
260 | // | |
261 | // Return error on global x | |
262 | // | |
263 | Double_t cm[6]; | |
264 | GetCovMatrix(cm); | |
265 | return TMath::Sqrt(cm[0]); | |
266 | } | |
267 | //-------------------------------------------------------------------------- | |
268 | Double_t AliITSVertex::GetYRes() const { | |
269 | // | |
270 | // Return error on global y | |
271 | // | |
272 | Double_t cm[6]; | |
273 | GetCovMatrix(cm); | |
274 | return TMath::Sqrt(cm[2]); | |
275 | } | |
276 | //-------------------------------------------------------------------------- | |
277 | Double_t AliITSVertex::GetZRes() const { | |
278 | // | |
279 | // Return error on global z | |
280 | // | |
281 | Double_t cm[6]; | |
282 | GetCovMatrix(cm); | |
283 | return TMath::Sqrt(cm[5]); | |
284 | } | |
285 | //-------------------------------------------------------------------------- | |
286 | void AliITSVertex::GetSNR(Double_t snr[3]) const { | |
287 | // | |
288 | // Return S/N ratios | |
289 | // | |
290 | for(Int_t i=0;i<3;i++) snr[i] = fSNR[i]; | |
291 | ||
292 | return; | |
293 | } | |
294 | //-------------------------------------------------------------------------- | |
295 | void AliITSVertex::PrintStatus() const { | |
296 | // | |
297 | // Print out information on all data members | |
298 | // | |
299 | if(fPhi) { | |
300 | printf(" ! The vertex fitting has been done in the thrust frame !\n"); | |
301 | printf(" The rotation angle is %f. Numbers are given in the rotated frame.\n",fPhi); | |
302 | } | |
303 | printf(" Vertex position:\n"); | |
304 | printf(" x = %f +- %f\n",fPosition[0],TMath::Sqrt(fCovXX)); | |
305 | printf(" y = %f +- %f\n",fPosition[1],TMath::Sqrt(fCovYY)); | |
306 | printf(" z = %f +- %f\n",fPosition[2],TMath::Sqrt(fCovZZ)); | |
307 | printf(" Covariance matrix:\n"); | |
308 | printf(" %12.10f %12.10f %12.10f\n %12.10f %12.10f %12.10f\n %12.10f %12.10f %12.10f\n",fCovXX,fCovXY,fCovXZ,fCovXY,fCovYY,fCovYZ,fCovXZ,fCovYZ,fCovZZ); | |
309 | printf(" S/N = (%f, %f, %f)\n",fSNR[0],fSNR[1],fSNR[2]); | |
310 | printf(" chi2 = %f\n",fChi2); | |
311 | printf(" # tracks (or tracklets) = %d\n",fNContributors); | |
312 | ||
313 | printf(" True vertex position - for comparison: %12.10f %12.10f %12.10f\n ",fTruePos[0],fTruePos[1],fTruePos[2]); | |
314 | ||
315 | return; | |
316 | } | |
317 | ||
318 | ||
319 | ||
320 |