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4c039060 | 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 | ||
16 | /* | |
17 | $Log$ | |
29beb80d | 18 | Revision 1.4 1999/11/03 14:23:18 fca |
19 | New version of RALICE introduced | |
20 | ||
959fbac5 | 21 | Revision 1.3 1999/09/29 09:24:28 fca |
22 | Introduction of the Copyright and cvs Log | |
23 | ||
4c039060 | 24 | */ |
25 | ||
959fbac5 | 26 | /////////////////////////////////////////////////////////////////////////// |
27 | // Class AliVertex | |
28 | // Creation and investigation of an AliVertex. | |
29 | // An AliVertex can be constructed by adding AliTracks and/or AliJets. | |
30 | // | |
31 | // Note : Also (secondary) vertices can be added to a vertex. | |
32 | // | |
33 | // Coding example to make 3 vertices v1, v2 and v3. | |
34 | // ------------------------------------------------ | |
35 | // v1 contains the tracks 1,2,3 and 4 | |
36 | // v2 contains the tracks 5,6 and 7 | |
37 | // v3 contains the jets 1 and 2 | |
38 | // | |
39 | // AliTrack t1,t2,t3,t4,t5,t6,t7; | |
40 | // ... | |
41 | // ... // code to fill the track data | |
42 | // ... | |
43 | // | |
44 | // AliJet j1,j2; | |
45 | // ... | |
46 | // ... // code to fill the jet data | |
47 | // ... | |
48 | // | |
49 | // AliVertex v1(5); | |
50 | // | |
51 | // v1.Add(t1); | |
52 | // v1.Add(t2); | |
53 | // v1.Add(t3); | |
54 | // v1.Add(t4); | |
55 | // | |
56 | // Float_t r1[3]={2.4,0.1,-8.5}; | |
57 | // v1.SetPosition(r1,"car"); | |
58 | // | |
59 | // AliVertex v2(2); | |
60 | // v2.Add(t5); | |
61 | // v2.Add(t6); | |
62 | // v2.Add(t7); | |
63 | // | |
64 | // Float_t r2[3]={1.6,-3.2,5.7}; | |
65 | // v2.SetPosition(r2,"car"); | |
66 | // | |
67 | // AliVertex v3; | |
68 | // | |
69 | // v3.Add(j1); | |
70 | // v3.Add(j2); | |
71 | // | |
72 | // Float_t r3[3]={6.2,4.8,1.3}; | |
73 | // v3.SetPosition(r3,"car"); | |
74 | // | |
75 | // v1.Info("sph"); | |
76 | // v2.ListAll(); | |
77 | // v3.List("cyl"); | |
78 | // | |
79 | // Float_t e1=v1.GetEnergy(); | |
80 | // Ali3Vector p1=v1.Get3Momentum(); | |
81 | // Float_t loc[3]; | |
82 | // v1.GetPosition(loc,"sph"); | |
83 | // AliPosition r=v2.GetPosition(); | |
84 | // r.Info(); | |
85 | // Int_t nt=v2.GetNtracks(); | |
86 | // AliTrack* tv=v2.GetTrack(1); // Access track number 1 of Vertex v2 | |
87 | // | |
88 | // Specify the vertices v2 and v3 as secondary vertices of v1 | |
89 | // | |
90 | // v1.Add(v2); | |
91 | // v1.Add(v3); | |
92 | // | |
93 | // v1.List(); | |
94 | // | |
95 | // Int_t nv=v1.GetNvtx(); | |
96 | // AliVertex* vx=v1.GetVertex(1); // Access 1st secondary vertex of v1 | |
97 | // Float_t e=vx->GetEnergy(); | |
98 | // | |
99 | // Float_t M=v1.GetInvmass(); | |
100 | // | |
101 | // Reconstruct Vertex v1 from scratch | |
102 | // | |
103 | // v1.Reset(); | |
104 | // v1.SetNvmax(25); // Increase initial no. of sec. vertices | |
105 | // v1.Add(t3); | |
106 | // v1.Add(t7); | |
107 | // v1.Add(j2); | |
108 | // Float_t pos[3]={7,9,4}; | |
109 | // v1.SetPosition(pos,"car"); | |
110 | // | |
111 | // Note : All quantities are in GeV, GeV/c or GeV/c**2 | |
112 | // | |
113 | //--- Author: Nick van Eijndhoven 04-apr-1998 UU-SAP Utrecht | |
114 | //- Modified: NvE 08-apr-1999 UU-SAP Utrecht to inherit from AliJet | |
115 | /////////////////////////////////////////////////////////////////////////// | |
116 | ||
d88f97cc | 117 | #include "AliVertex.h" |
118 | ||
119 | ClassImp(AliVertex) // Class implementation to enable ROOT I/O | |
120 | ||
121 | AliVertex::AliVertex() | |
122 | { | |
959fbac5 | 123 | // Default constructor. |
124 | // All variables initialised to 0. | |
125 | // Initial maximum number of tracks is set to the default value. | |
126 | // Initial maximum number of sec. vertices is set to the default value. | |
d88f97cc | 127 | fNvmax=0; |
128 | fVertices=0; | |
29beb80d | 129 | fConnects=0; |
d88f97cc | 130 | Reset(); |
131 | SetNtinit(); | |
132 | SetNvmax(); | |
133 | } | |
134 | /////////////////////////////////////////////////////////////////////////// | |
135 | AliVertex::AliVertex(Int_t n) | |
136 | { | |
137 | // Create a vertex to hold initially a maximum of n tracks | |
138 | // All variables initialised to 0 | |
139 | fNvmax=0; | |
140 | fVertices=0; | |
29beb80d | 141 | fConnects=0; |
d88f97cc | 142 | Reset(); |
143 | if (n > 0) | |
144 | { | |
145 | SetNtinit(n); | |
146 | } | |
147 | else | |
148 | { | |
149 | cout << endl; | |
150 | cout << " *AliVertex* Initial max. number of tracks entered : " << n << endl; | |
151 | cout << " This is invalid. Default initial maximum will be used." << endl; | |
152 | cout << endl; | |
153 | SetNtinit(); | |
154 | } | |
155 | SetNvmax(); | |
156 | } | |
157 | /////////////////////////////////////////////////////////////////////////// | |
158 | AliVertex::~AliVertex() | |
159 | { | |
160 | // Default destructor | |
161 | if (fVertices) delete fVertices; | |
162 | fVertices=0; | |
29beb80d | 163 | if (fConnects) |
164 | { | |
165 | fConnects->Delete(); | |
166 | delete fConnects; | |
167 | fConnects=0; | |
168 | } | |
d88f97cc | 169 | } |
170 | /////////////////////////////////////////////////////////////////////////// | |
171 | void AliVertex::SetNvmax(Int_t n) | |
172 | { | |
173 | // Set the initial maximum number of (secondary) vertices | |
174 | if (n > 0) | |
175 | { | |
176 | fNvmax=n; | |
177 | } | |
178 | else | |
179 | { | |
180 | fNvmax=1; | |
181 | } | |
182 | if (fVertices) delete fVertices; | |
183 | fVertices=new TObjArray(fNvmax); | |
184 | } | |
185 | /////////////////////////////////////////////////////////////////////////// | |
186 | void AliVertex::Reset() | |
187 | { | |
188 | // Reset all variables to 0 | |
189 | // The max. number of tracks is set to the initial value again | |
190 | // The max. number of vertices is set to the default value again | |
191 | ||
192 | AliJet::Reset(); | |
193 | ||
194 | fNvtx=0; | |
195 | if (fNvmax>0) SetNvmax(fNvmax); | |
29beb80d | 196 | if (fConnects) |
197 | { | |
198 | fConnects->Delete(); | |
199 | delete fConnects; | |
200 | fConnects=0; | |
201 | } | |
d88f97cc | 202 | } |
203 | /////////////////////////////////////////////////////////////////////////// | |
204 | void AliVertex::Add(AliJet& j) | |
205 | { | |
206 | // Add the tracks of a jet to the vertex | |
207 | AliTrack* tj; | |
208 | for (Int_t i=1; i<=j.GetNtracks(); i++) | |
209 | { | |
210 | tj=j.GetTrack(i); | |
211 | AliJet::Add(tj); | |
212 | } | |
213 | } | |
214 | /////////////////////////////////////////////////////////////////////////// | |
29beb80d | 215 | void AliVertex::Add(AliVertex& v,Int_t connect) |
d88f97cc | 216 | { |
217 | // Add a (secondary) vertex to the current vertex. | |
218 | // In case the maximum number of (secondary) vertices has been reached, | |
219 | // the array space will be extended automatically | |
220 | // | |
29beb80d | 221 | // Note : By default the 4-momentum and charge of the current (primary) vertex |
222 | // are updated by automatically creating the track connecting | |
223 | // both vertices. The track parameters are taken from the | |
224 | // 4-momentum and charge of the secondary vertex. | |
225 | // The automatic creation of the connecting track and updating | |
226 | // of the (primary) vertex 4-momentum and charge can be suppressed | |
227 | // by specifying connect=0. In this case, however, the user | |
228 | // has to introduce the connecting track lateron by hand | |
229 | // explicitly in order to match the kinematics and charge. | |
d88f97cc | 230 | // |
231 | if (fNvtx == fNvmax) // Check if maximum vertex number is reached | |
232 | { | |
233 | fNvmax++; | |
234 | fVertices->Expand(fNvmax); | |
235 | } | |
29beb80d | 236 | |
237 | // Add the linked (secondary) vertex to the list | |
d88f97cc | 238 | fNvtx++; |
239 | fVertices->Add(&v); | |
29beb80d | 240 | |
241 | // Create connecting track and update 4-momentum and charge for current vertex | |
242 | if (connect) | |
243 | { | |
244 | AliPosition r1=GetPosition(); | |
245 | AliPosition r2=v.GetPosition(); | |
246 | Float_t q=v.GetCharge(); | |
247 | Ali3Vector p=v.Get3Momentum(); | |
248 | Double_t v2=v.GetInvariant(); | |
249 | Double_t dv2=v.Ali4Vector::GetResultError(); | |
250 | ||
251 | AliTrack* t=new AliTrack; | |
252 | t->SetBeginPoint(r1); | |
253 | t->SetEndPoint(r2); | |
254 | t->SetCharge(q); | |
255 | t->Set3Momentum(p); | |
256 | t->SetInvariant(v2,dv2); | |
257 | ||
258 | AliJet::Add(t); | |
259 | ||
260 | if (!fConnects) fConnects=new TObjArray(fNvmax); | |
261 | fConnects->Add(t); | |
262 | } | |
d88f97cc | 263 | } |
264 | /////////////////////////////////////////////////////////////////////////// | |
265 | void AliVertex::Info(TString f) | |
266 | { | |
267 | // Provide vertex information within the coordinate frame f | |
268 | cout << " *AliVertex::Info* Invmass : " << GetInvmass() | |
269 | << " Charge : " << GetCharge() << " Momentum : " << GetMomentum() | |
270 | << " Ntracks : " << GetNtracks() << " Nvertices : " << fNvtx << endl; | |
271 | cout << " "; | |
272 | Ali4Vector::Info(f); | |
273 | cout << " Position"; | |
274 | AliPosition::Info(f); | |
275 | } | |
276 | /////////////////////////////////////////////////////////////////////////// | |
277 | void AliVertex::List(TString f) | |
278 | { | |
279 | // Provide primary track and sec. vertex information within the coordinate frame f | |
280 | ||
281 | Info(f); // Information of the current vertex | |
282 | ||
283 | // The tracks of this vertex | |
284 | AliTrack* t; | |
285 | for (Int_t it=1; it<=GetNtracks(); it++) | |
286 | { | |
287 | t=GetTrack(it); | |
288 | if (t) | |
289 | { | |
290 | cout << " ---Track no. " << it << endl; | |
291 | cout << " "; | |
292 | t->Info(f); | |
293 | } | |
294 | else | |
295 | { | |
296 | cout << " *AliVertex::List* Error : No track present." << endl; | |
297 | } | |
298 | } | |
299 | ||
300 | // The secondary vertices of this vertex | |
301 | AliVertex* v; | |
302 | for (Int_t iv=1; iv<=GetNvertices(); iv++) | |
303 | { | |
304 | v=GetVertex(iv); | |
305 | if (v) | |
306 | { | |
307 | cout << " ---Level 1 sec. vertex no. " << iv << endl; | |
308 | cout << " "; | |
309 | v->Info(f); | |
310 | } | |
311 | else | |
312 | { | |
313 | cout << " *AliVertex::List* Error : No sec. vertex present." << endl; | |
314 | } | |
315 | } | |
316 | } | |
317 | /////////////////////////////////////////////////////////////////////////// | |
318 | void AliVertex::ListAll(TString f) | |
319 | { | |
320 | // Provide complete (sec) vertex and (decay) track info within the coordinate frame f | |
321 | ||
322 | Info(f); // Information of the current vertex | |
323 | ||
324 | // The tracks of this vertex | |
325 | AliTrack* t; | |
326 | for (Int_t it=1; it<=GetNtracks(); it++) | |
327 | { | |
328 | t=GetTrack(it); | |
329 | if (t) | |
330 | { | |
331 | cout << " ---Track no. " << it << endl; | |
332 | cout << " "; | |
333 | t->ListAll(f); | |
334 | } | |
335 | else | |
336 | { | |
337 | cout << " *AliVertex::ListAll* Error : No track present." << endl; | |
338 | } | |
339 | } | |
340 | ||
341 | AliVertex* v=this; | |
342 | Dump(v,1,f); // Information of all sec. vertices | |
343 | } | |
344 | ////////////////////////////////////////////////////////////////////////// | |
345 | void AliVertex::Dump(AliVertex* v,Int_t n,TString f) | |
346 | { | |
347 | // Recursively provide the info of all secondary vertices of this vertex | |
348 | AliVertex* vs; | |
349 | for (Int_t iv=1; iv<=v->GetNvertices(); iv++) | |
350 | { | |
351 | vs=v->GetVertex(iv); | |
352 | if (vs) | |
353 | { | |
354 | cout << " ---Level " << n << " sec. vertex no. " << iv << endl; | |
355 | cout << " "; | |
356 | vs->Info(f); | |
357 | ||
358 | // The tracks of this vertex | |
359 | AliTrack* t; | |
360 | for (Int_t it=1; it<=vs->GetNtracks(); it++) | |
361 | { | |
362 | t=vs->GetTrack(it); | |
363 | if (t) | |
364 | { | |
365 | cout << " ---Track no. " << it << endl; | |
366 | cout << " "; | |
367 | t->ListAll(f); | |
368 | } | |
369 | else | |
370 | { | |
371 | cout << " *AliVertex::Dump* Error : No track present." << endl; | |
372 | } | |
373 | } | |
374 | ||
375 | // Go for next sec. vertex level of this sec. vertex recursively | |
376 | Dump(vs,n+1,f); | |
377 | } | |
378 | else | |
379 | { | |
380 | cout << " *AliVertex::Dump* Error : No sec. vertex present." << endl; | |
381 | } | |
382 | } | |
383 | } | |
384 | ////////////////////////////////////////////////////////////////////////// | |
385 | Int_t AliVertex::GetNvertices() | |
386 | { | |
387 | // Return the current number of (secondary) vertices | |
388 | return fNvtx; | |
389 | } | |
390 | /////////////////////////////////////////////////////////////////////////// | |
391 | AliVertex* AliVertex::GetVertex(Int_t i) | |
392 | { | |
393 | // Return the i-th (secondary) vertex of the current vertex | |
394 | return (AliVertex*)fVertices->At(i-1); | |
395 | } | |
396 | /////////////////////////////////////////////////////////////////////////// |