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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 | ||
f531a546 | 16 | // $Id$ |
4c039060 | 17 | |
959fbac5 | 18 | /////////////////////////////////////////////////////////////////////////// |
19 | // Class AliVertex | |
20 | // Creation and investigation of an AliVertex. | |
21 | // An AliVertex can be constructed by adding AliTracks and/or AliJets. | |
22 | // | |
23 | // Note : Also (secondary) vertices can be added to a vertex. | |
24 | // | |
25 | // Coding example to make 3 vertices v1, v2 and v3. | |
26 | // ------------------------------------------------ | |
27 | // v1 contains the tracks 1,2,3 and 4 | |
28 | // v2 contains the tracks 5,6 and 7 | |
29 | // v3 contains the jets 1 and 2 | |
30 | // | |
31 | // AliTrack t1,t2,t3,t4,t5,t6,t7; | |
32 | // ... | |
33 | // ... // code to fill the track data | |
34 | // ... | |
35 | // | |
36 | // AliJet j1,j2; | |
37 | // ... | |
38 | // ... // code to fill the jet data | |
39 | // ... | |
40 | // | |
41 | // AliVertex v1(5); | |
42 | // | |
f531a546 | 43 | // v1.AddTrack(t1); |
44 | // v1.AddTrack(t2); | |
45 | // v1.AddTrack(t3); | |
46 | // v1.AddTrack(t4); | |
959fbac5 | 47 | // |
48 | // Float_t r1[3]={2.4,0.1,-8.5}; | |
49 | // v1.SetPosition(r1,"car"); | |
50 | // | |
51 | // AliVertex v2(2); | |
f531a546 | 52 | // v2.AddTrack(t5); |
53 | // v2.AddTrack(t6); | |
54 | // v2.AddTrack(t7); | |
959fbac5 | 55 | // |
56 | // Float_t r2[3]={1.6,-3.2,5.7}; | |
57 | // v2.SetPosition(r2,"car"); | |
58 | // | |
59 | // AliVertex v3; | |
60 | // | |
f531a546 | 61 | // v3.AddJet(j1); |
62 | // v3.AddJet(j2); | |
959fbac5 | 63 | // |
64 | // Float_t r3[3]={6.2,4.8,1.3}; | |
65 | // v3.SetPosition(r3,"car"); | |
66 | // | |
67 | // v1.Info("sph"); | |
68 | // v2.ListAll(); | |
69 | // v3.List("cyl"); | |
70 | // | |
71 | // Float_t e1=v1.GetEnergy(); | |
72 | // Ali3Vector p1=v1.Get3Momentum(); | |
73 | // Float_t loc[3]; | |
74 | // v1.GetPosition(loc,"sph"); | |
75 | // AliPosition r=v2.GetPosition(); | |
76 | // r.Info(); | |
77 | // Int_t nt=v2.GetNtracks(); | |
78 | // AliTrack* tv=v2.GetTrack(1); // Access track number 1 of Vertex v2 | |
79 | // | |
80 | // Specify the vertices v2 and v3 as secondary vertices of v1 | |
81 | // | |
f531a546 | 82 | // v1.AddVertex(v2); |
83 | // v1.AddVertex(v3); | |
959fbac5 | 84 | // |
85 | // v1.List(); | |
86 | // | |
87 | // Int_t nv=v1.GetNvtx(); | |
88 | // AliVertex* vx=v1.GetVertex(1); // Access 1st secondary vertex of v1 | |
89 | // Float_t e=vx->GetEnergy(); | |
90 | // | |
91 | // Float_t M=v1.GetInvmass(); | |
92 | // | |
93 | // Reconstruct Vertex v1 from scratch | |
94 | // | |
95 | // v1.Reset(); | |
96 | // v1.SetNvmax(25); // Increase initial no. of sec. vertices | |
f531a546 | 97 | // v1.AddTrack(t3); |
98 | // v1.AddTrack(t7); | |
99 | // v1.AddJet(j2); | |
959fbac5 | 100 | // Float_t pos[3]={7,9,4}; |
101 | // v1.SetPosition(pos,"car"); | |
102 | // | |
103 | // Note : All quantities are in GeV, GeV/c or GeV/c**2 | |
104 | // | |
105 | //--- Author: Nick van Eijndhoven 04-apr-1998 UU-SAP Utrecht | |
f531a546 | 106 | //- Modified: NvE $Date$ UU-SAP Utrecht |
959fbac5 | 107 | /////////////////////////////////////////////////////////////////////////// |
108 | ||
d88f97cc | 109 | #include "AliVertex.h" |
110 | ||
111 | ClassImp(AliVertex) // Class implementation to enable ROOT I/O | |
112 | ||
113 | AliVertex::AliVertex() | |
114 | { | |
959fbac5 | 115 | // Default constructor. |
116 | // All variables initialised to 0. | |
117 | // Initial maximum number of tracks is set to the default value. | |
118 | // Initial maximum number of sec. vertices is set to the default value. | |
d88f97cc | 119 | fNvmax=0; |
120 | fVertices=0; | |
29beb80d | 121 | fConnects=0; |
d88f97cc | 122 | Reset(); |
123 | SetNtinit(); | |
124 | SetNvmax(); | |
125 | } | |
126 | /////////////////////////////////////////////////////////////////////////// | |
127 | AliVertex::AliVertex(Int_t n) | |
128 | { | |
129 | // Create a vertex to hold initially a maximum of n tracks | |
130 | // All variables initialised to 0 | |
131 | fNvmax=0; | |
132 | fVertices=0; | |
29beb80d | 133 | fConnects=0; |
d88f97cc | 134 | Reset(); |
135 | if (n > 0) | |
136 | { | |
137 | SetNtinit(n); | |
138 | } | |
139 | else | |
140 | { | |
141 | cout << endl; | |
142 | cout << " *AliVertex* Initial max. number of tracks entered : " << n << endl; | |
143 | cout << " This is invalid. Default initial maximum will be used." << endl; | |
144 | cout << endl; | |
145 | SetNtinit(); | |
146 | } | |
147 | SetNvmax(); | |
148 | } | |
149 | /////////////////////////////////////////////////////////////////////////// | |
150 | AliVertex::~AliVertex() | |
151 | { | |
152 | // Default destructor | |
153 | if (fVertices) delete fVertices; | |
154 | fVertices=0; | |
29beb80d | 155 | if (fConnects) |
156 | { | |
157 | fConnects->Delete(); | |
158 | delete fConnects; | |
159 | fConnects=0; | |
160 | } | |
d88f97cc | 161 | } |
162 | /////////////////////////////////////////////////////////////////////////// | |
163 | void AliVertex::SetNvmax(Int_t n) | |
164 | { | |
165 | // Set the initial maximum number of (secondary) vertices | |
166 | if (n > 0) | |
167 | { | |
168 | fNvmax=n; | |
169 | } | |
170 | else | |
171 | { | |
172 | fNvmax=1; | |
173 | } | |
174 | if (fVertices) delete fVertices; | |
175 | fVertices=new TObjArray(fNvmax); | |
176 | } | |
177 | /////////////////////////////////////////////////////////////////////////// | |
178 | void AliVertex::Reset() | |
179 | { | |
180 | // Reset all variables to 0 | |
181 | // The max. number of tracks is set to the initial value again | |
182 | // The max. number of vertices is set to the default value again | |
183 | ||
184 | AliJet::Reset(); | |
185 | ||
f531a546 | 186 | Double_t a[3]={0,0,0}; |
187 | SetPosition(a,"sph"); | |
188 | SetPositionErrors(a,"car"); | |
189 | ||
d88f97cc | 190 | fNvtx=0; |
191 | if (fNvmax>0) SetNvmax(fNvmax); | |
29beb80d | 192 | if (fConnects) |
193 | { | |
194 | fConnects->Delete(); | |
195 | delete fConnects; | |
196 | fConnects=0; | |
197 | } | |
d88f97cc | 198 | } |
199 | /////////////////////////////////////////////////////////////////////////// | |
f531a546 | 200 | void AliVertex::AddJet(AliJet& j) |
d88f97cc | 201 | { |
202 | // Add the tracks of a jet to the vertex | |
203 | AliTrack* tj; | |
204 | for (Int_t i=1; i<=j.GetNtracks(); i++) | |
205 | { | |
206 | tj=j.GetTrack(i); | |
f531a546 | 207 | AliJet::AddTrack(tj); |
d88f97cc | 208 | } |
209 | } | |
210 | /////////////////////////////////////////////////////////////////////////// | |
f531a546 | 211 | void AliVertex::AddVertex(AliVertex& v,Int_t connect) |
d88f97cc | 212 | { |
213 | // Add a (secondary) vertex to the current vertex. | |
214 | // In case the maximum number of (secondary) vertices has been reached, | |
215 | // the array space will be extended automatically | |
216 | // | |
29beb80d | 217 | // Note : By default the 4-momentum and charge of the current (primary) vertex |
218 | // are updated by automatically creating the track connecting | |
219 | // both vertices. The track parameters are taken from the | |
220 | // 4-momentum and charge of the secondary vertex. | |
221 | // The automatic creation of the connecting track and updating | |
222 | // of the (primary) vertex 4-momentum and charge can be suppressed | |
223 | // by specifying connect=0. In this case, however, the user | |
224 | // has to introduce the connecting track lateron by hand | |
225 | // explicitly in order to match the kinematics and charge. | |
d88f97cc | 226 | // |
227 | if (fNvtx == fNvmax) // Check if maximum vertex number is reached | |
228 | { | |
229 | fNvmax++; | |
230 | fVertices->Expand(fNvmax); | |
231 | } | |
29beb80d | 232 | |
233 | // Add the linked (secondary) vertex to the list | |
d88f97cc | 234 | fNvtx++; |
235 | fVertices->Add(&v); | |
29beb80d | 236 | |
237 | // Create connecting track and update 4-momentum and charge for current vertex | |
238 | if (connect) | |
239 | { | |
240 | AliPosition r1=GetPosition(); | |
241 | AliPosition r2=v.GetPosition(); | |
242 | Float_t q=v.GetCharge(); | |
243 | Ali3Vector p=v.Get3Momentum(); | |
244 | Double_t v2=v.GetInvariant(); | |
245 | Double_t dv2=v.Ali4Vector::GetResultError(); | |
246 | ||
247 | AliTrack* t=new AliTrack; | |
248 | t->SetBeginPoint(r1); | |
249 | t->SetEndPoint(r2); | |
250 | t->SetCharge(q); | |
251 | t->Set3Momentum(p); | |
252 | t->SetInvariant(v2,dv2); | |
253 | ||
f531a546 | 254 | AliJet::AddTrack(t); |
29beb80d | 255 | |
256 | if (!fConnects) fConnects=new TObjArray(fNvmax); | |
257 | fConnects->Add(t); | |
258 | } | |
d88f97cc | 259 | } |
260 | /////////////////////////////////////////////////////////////////////////// | |
261 | void AliVertex::Info(TString f) | |
262 | { | |
263 | // Provide vertex information within the coordinate frame f | |
264 | cout << " *AliVertex::Info* Invmass : " << GetInvmass() | |
265 | << " Charge : " << GetCharge() << " Momentum : " << GetMomentum() | |
266 | << " Ntracks : " << GetNtracks() << " Nvertices : " << fNvtx << endl; | |
267 | cout << " "; | |
268 | Ali4Vector::Info(f); | |
269 | cout << " Position"; | |
270 | AliPosition::Info(f); | |
271 | } | |
272 | /////////////////////////////////////////////////////////////////////////// | |
273 | void AliVertex::List(TString f) | |
274 | { | |
275 | // Provide primary track and sec. vertex information within the coordinate frame f | |
276 | ||
277 | Info(f); // Information of the current vertex | |
278 | ||
279 | // The tracks of this vertex | |
280 | AliTrack* t; | |
281 | for (Int_t it=1; it<=GetNtracks(); it++) | |
282 | { | |
283 | t=GetTrack(it); | |
284 | if (t) | |
285 | { | |
286 | cout << " ---Track no. " << it << endl; | |
287 | cout << " "; | |
288 | t->Info(f); | |
289 | } | |
290 | else | |
291 | { | |
292 | cout << " *AliVertex::List* Error : No track present." << endl; | |
293 | } | |
294 | } | |
295 | ||
296 | // The secondary vertices of this vertex | |
297 | AliVertex* v; | |
298 | for (Int_t iv=1; iv<=GetNvertices(); iv++) | |
299 | { | |
300 | v=GetVertex(iv); | |
301 | if (v) | |
302 | { | |
303 | cout << " ---Level 1 sec. vertex no. " << iv << endl; | |
304 | cout << " "; | |
305 | v->Info(f); | |
306 | } | |
307 | else | |
308 | { | |
309 | cout << " *AliVertex::List* Error : No sec. vertex present." << endl; | |
310 | } | |
311 | } | |
312 | } | |
313 | /////////////////////////////////////////////////////////////////////////// | |
314 | void AliVertex::ListAll(TString f) | |
315 | { | |
316 | // Provide complete (sec) vertex and (decay) track info within the coordinate frame f | |
317 | ||
318 | Info(f); // Information of the current vertex | |
319 | ||
320 | // The tracks of this vertex | |
321 | AliTrack* t; | |
322 | for (Int_t it=1; it<=GetNtracks(); it++) | |
323 | { | |
324 | t=GetTrack(it); | |
325 | if (t) | |
326 | { | |
327 | cout << " ---Track no. " << it << endl; | |
328 | cout << " "; | |
329 | t->ListAll(f); | |
330 | } | |
331 | else | |
332 | { | |
333 | cout << " *AliVertex::ListAll* Error : No track present." << endl; | |
334 | } | |
335 | } | |
336 | ||
337 | AliVertex* v=this; | |
338 | Dump(v,1,f); // Information of all sec. vertices | |
339 | } | |
340 | ////////////////////////////////////////////////////////////////////////// | |
341 | void AliVertex::Dump(AliVertex* v,Int_t n,TString f) | |
342 | { | |
343 | // Recursively provide the info of all secondary vertices of this vertex | |
344 | AliVertex* vs; | |
345 | for (Int_t iv=1; iv<=v->GetNvertices(); iv++) | |
346 | { | |
347 | vs=v->GetVertex(iv); | |
348 | if (vs) | |
349 | { | |
350 | cout << " ---Level " << n << " sec. vertex no. " << iv << endl; | |
351 | cout << " "; | |
352 | vs->Info(f); | |
353 | ||
354 | // The tracks of this vertex | |
355 | AliTrack* t; | |
356 | for (Int_t it=1; it<=vs->GetNtracks(); it++) | |
357 | { | |
358 | t=vs->GetTrack(it); | |
359 | if (t) | |
360 | { | |
361 | cout << " ---Track no. " << it << endl; | |
362 | cout << " "; | |
363 | t->ListAll(f); | |
364 | } | |
365 | else | |
366 | { | |
367 | cout << " *AliVertex::Dump* Error : No track present." << endl; | |
368 | } | |
369 | } | |
370 | ||
371 | // Go for next sec. vertex level of this sec. vertex recursively | |
372 | Dump(vs,n+1,f); | |
373 | } | |
374 | else | |
375 | { | |
376 | cout << " *AliVertex::Dump* Error : No sec. vertex present." << endl; | |
377 | } | |
378 | } | |
379 | } | |
380 | ////////////////////////////////////////////////////////////////////////// | |
381 | Int_t AliVertex::GetNvertices() | |
382 | { | |
383 | // Return the current number of (secondary) vertices | |
384 | return fNvtx; | |
385 | } | |
386 | /////////////////////////////////////////////////////////////////////////// | |
387 | AliVertex* AliVertex::GetVertex(Int_t i) | |
388 | { | |
389 | // Return the i-th (secondary) vertex of the current vertex | |
390 | return (AliVertex*)fVertices->At(i-1); | |
391 | } | |
392 | /////////////////////////////////////////////////////////////////////////// |