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 AliTrack |
20 | // Handling of the attributes of a reconstructed particle track. |
21 | // |
22 | // Coding example : |
23 | // ---------------- |
24 | // |
25 | // Float_t a[4]={195.,1.2,-0.04,8.5}; |
26 | // Ali4Vector pmu; |
27 | // pmu.SetVector(a,"car"); |
28 | // AliTrack t1; |
29 | // t1.Set4Momentum(pmu); |
30 | // |
31 | // Float_t b[3]={1.2,-0.04,8.5}; |
32 | // Ali3Vector p; |
33 | // p.SetVector(b,"car"); |
34 | // AliTrack t2; |
35 | // t2.Set3Momentum(p); |
36 | // t2.SetCharge(0); |
37 | // t2.SetMass(1.115); |
38 | // |
84bb7c66 |
39 | // t1.Data(); |
40 | // t2.Data(); |
959fbac5 |
41 | // |
42 | // Float_t pi=acos(-1.); |
43 | // Float_t thcms=0.2*pi; // decay theta angle in cms |
44 | // Float_t phicms=pi/4.; // decay theta angle in cms |
45 | // Float_t m1=0.938; |
46 | // Float_t m2=0.140; |
47 | // t2.Decay(m1,m2,thcms,phicms); // Track t2 decay : Lambda -> proton + pion |
48 | // |
49 | // t2.List(); |
50 | // |
51 | // Int_t ndec=t2.GetNdecay(); |
52 | // AliTrack* d1=t2.GetDecayTrack(1); // Access to decay track number 1 |
53 | // AliTrack* d2=t2.GetDecayTrack(2); // Access to decay track number 2 |
54 | // |
55 | // AliSignal s1,s2,s3,s4; |
56 | // |
57 | // .... // Code (e.g. detector readout) to fill AliSignal data |
58 | // |
59 | // AliTrack trec; // Track which will be reconstructed from signals |
60 | // trec.AddSignal(s1); |
61 | // trec.AddSignal(s3); |
62 | // trec.AddSignal(s4); |
63 | // |
64 | // Ali3Vector P; |
65 | // Float_t Q,M; |
66 | // |
67 | // ... // Code which accesses signals from trec and reconstructs |
68 | // 3-momentum P, charge Q, mass M etc... |
69 | // |
70 | // trec.Set3Momentum(P); |
71 | // trec.SetCharge(Q); |
72 | // trec.SetMass(M); |
73 | // |
74 | // Float_t r1[3]={1.6,-3.8,25.7}; |
75 | // Float_t er1[3]={0.2,0.5,1.8}; |
76 | // Float_t r2[3]={8.6,23.8,-6.7}; |
77 | // Float_t er2[3]={0.93,1.78,0.8}; |
78 | // AliPosition begin,end; |
79 | // begin.SetPosition(r1,"car"); |
80 | // begin.SetPositionErrors(er1,"car"); |
81 | // end.SetPosition(r2,"car"); |
82 | // end.SetPositionErrors(er2,"car"); |
83 | // trec.SetBeginPoint(begin); |
84 | // trec.SetEndPoint(end); |
85 | // |
86 | // Note : All quantities are in GeV, GeV/c or GeV/c**2 |
87 | // |
88 | //--- Author: Nick van Eijndhoven 10-jul-1997 UU-SAP Utrecht |
f531a546 |
89 | //- Modified: NvE $Date$ UU-SAP Utrecht |
959fbac5 |
90 | /////////////////////////////////////////////////////////////////////////// |
91 | |
d88f97cc |
92 | #include "AliTrack.h" |
c72198f1 |
93 | #include "Riostream.h" |
d88f97cc |
94 | |
95 | ClassImp(AliTrack) // Class implementation to enable ROOT I/O |
96 | |
5f25234b |
97 | AliTrack::AliTrack() : TNamed(),Ali4Vector() |
d88f97cc |
98 | { |
99 | // Default constructor |
100 | // All variables initialised to 0 |
6516b62d |
101 | Init(); |
102 | Reset(); |
103 | } |
104 | /////////////////////////////////////////////////////////////////////////// |
105 | void AliTrack::Init() |
106 | { |
107 | // Initialisation of pointers etc... |
d88f97cc |
108 | fDecays=0; |
959fbac5 |
109 | fSignals=0; |
5f25234b |
110 | fHypotheses=0; |
c72198f1 |
111 | fBegin=0; |
112 | fEnd=0; |
c5555bc0 |
113 | fRef=0; |
c72198f1 |
114 | fImpactXY=0; |
115 | fImpactXZ=0; |
116 | fImpactYZ=0; |
117 | fClosest=0; |
1fbffa23 |
118 | fParent=0; |
ea0b5b7f |
119 | fFit=0; |
a7dc0627 |
120 | fTstamp=0; |
d88f97cc |
121 | } |
122 | /////////////////////////////////////////////////////////////////////////// |
123 | AliTrack::~AliTrack() |
124 | { |
5f25234b |
125 | // Destructor to delete memory allocated for decay tracks array. |
126 | // This destructor automatically cleares the pointer of this AliTrack |
127 | // from all the link slots of the related AliSignal objects. |
5f25234b |
128 | Int_t nsig=GetNsignals(); |
129 | for (Int_t i=1; i<=nsig; i++) |
130 | { |
131 | AliSignal* s=GetSignal(i); |
d0a8ef71 |
132 | if (s) s->ResetLinks(this); |
5f25234b |
133 | } |
134 | |
d88f97cc |
135 | if (fDecays) |
136 | { |
d88f97cc |
137 | delete fDecays; |
138 | fDecays=0; |
139 | } |
959fbac5 |
140 | if (fSignals) |
141 | { |
142 | fSignals->Clear(); |
143 | delete fSignals; |
144 | fSignals=0; |
145 | } |
5f25234b |
146 | if (fHypotheses) |
c72198f1 |
147 | { |
5f25234b |
148 | delete fHypotheses; |
149 | fHypotheses=0; |
c72198f1 |
150 | } |
151 | if (fBegin) |
152 | { |
153 | delete fBegin; |
154 | fBegin=0; |
155 | } |
156 | if (fEnd) |
157 | { |
158 | delete fEnd; |
159 | fEnd=0; |
160 | } |
c5555bc0 |
161 | if (fRef) |
162 | { |
163 | delete fRef; |
164 | fRef=0; |
165 | } |
c72198f1 |
166 | if (fImpactXY) |
167 | { |
168 | delete fImpactXY; |
169 | fImpactXY=0; |
170 | } |
171 | if (fImpactXZ) |
172 | { |
173 | delete fImpactXZ; |
174 | fImpactXZ=0; |
175 | } |
176 | if (fImpactYZ) |
177 | { |
178 | delete fImpactYZ; |
179 | fImpactYZ=0; |
180 | } |
181 | if (fClosest) |
182 | { |
183 | delete fClosest; |
184 | fClosest=0; |
185 | } |
ea0b5b7f |
186 | if (fFit) |
187 | { |
188 | delete fFit; |
189 | fFit=0; |
190 | } |
a7dc0627 |
191 | if (fTstamp) |
192 | { |
193 | delete fTstamp; |
194 | fTstamp=0; |
195 | } |
d88f97cc |
196 | } |
197 | /////////////////////////////////////////////////////////////////////////// |
261c0caf |
198 | AliTrack::AliTrack(const AliTrack& t) : TNamed(t),Ali4Vector(t) |
6516b62d |
199 | { |
200 | // Copy constructor |
201 | Init(); |
202 | |
c72198f1 |
203 | fQ=t.fQ; |
5f25234b |
204 | fProb=t.fProb; |
c72198f1 |
205 | if (t.fBegin) fBegin=new AliPositionObj(*(t.fBegin)); |
206 | if (t.fEnd) fEnd=new AliPositionObj(*(t.fEnd)); |
c5555bc0 |
207 | if (t.fRef) fRef=new AliPositionObj(*(t.fRef)); |
c72198f1 |
208 | if (t.fImpactXY) fImpactXY=new AliPositionObj(*(t.fImpactXY)); |
209 | if (t.fImpactXZ) fImpactXZ=new AliPositionObj(*(t.fImpactXZ)); |
210 | if (t.fImpactYZ) fImpactYZ=new AliPositionObj(*(t.fImpactYZ)); |
211 | if (t.fClosest) fClosest=new AliPositionObj(*(t.fClosest)); |
ea0b5b7f |
212 | if (t.fFit) fFit=t.fFit->Clone(); |
a7dc0627 |
213 | if (t.fTstamp) fTstamp=new AliTimestamp(*(t.fTstamp)); |
c72198f1 |
214 | fUserId=t.fUserId; |
215 | fChi2=t.fChi2; |
216 | fNdf=t.fNdf; |
217 | fCode=t.fCode; |
1fbffa23 |
218 | fParent=t.fParent; |
c72198f1 |
219 | |
5f25234b |
220 | Int_t ndec=t.GetNdecay(); |
221 | if (ndec) |
6516b62d |
222 | { |
5f25234b |
223 | fDecays=new TObjArray(ndec); |
6516b62d |
224 | fDecays->SetOwner(); |
5f25234b |
225 | for (Int_t it=1; it<=ndec; it++) |
6516b62d |
226 | { |
c72198f1 |
227 | AliTrack* tx=t.GetDecayTrack(it); |
6516b62d |
228 | fDecays->Add(new AliTrack(*tx)); |
229 | } |
230 | } |
231 | |
5f25234b |
232 | Int_t nsig=t.GetNsignals(); |
233 | if (nsig) |
6516b62d |
234 | { |
5f25234b |
235 | fSignals=new TObjArray(nsig); |
236 | for (Int_t is=1; is<=nsig; is++) |
6516b62d |
237 | { |
c72198f1 |
238 | AliSignal* sx=t.GetSignal(is); |
6516b62d |
239 | fSignals->Add(sx); |
240 | } |
241 | } |
5f25234b |
242 | |
243 | Int_t nhyp=t.GetNhypotheses(); |
244 | if (nhyp) |
245 | { |
246 | fHypotheses=new TObjArray(nhyp); |
247 | fHypotheses->SetOwner(); |
248 | for (Int_t ih=1; ih<=nhyp; ih++) |
249 | { |
250 | AliTrack* tx=t.GetTrackHypothesis(ih); |
251 | fHypotheses->Add(new AliTrack(*tx)); |
252 | } |
253 | } |
6516b62d |
254 | } |
255 | /////////////////////////////////////////////////////////////////////////// |
d88f97cc |
256 | void AliTrack::Reset() |
257 | { |
35044448 |
258 | // Reset all variables to 0 and delete all auto-generated decay tracks. |
d88f97cc |
259 | fQ=0; |
2693cb4e |
260 | fChi2=0; |
261 | fNdf=0; |
43bfa5be |
262 | fUserId=0; |
fdbea0ce |
263 | fCode=0; |
5f25234b |
264 | fProb=0; |
d88f97cc |
265 | Double_t a[4]={0,0,0,0}; |
266 | SetVector(a,"sph"); |
1fbffa23 |
267 | fParent=0; |
d88f97cc |
268 | if (fDecays) |
269 | { |
d88f97cc |
270 | delete fDecays; |
271 | fDecays=0; |
272 | } |
959fbac5 |
273 | if (fSignals) |
274 | { |
275 | fSignals->Clear(); |
276 | delete fSignals; |
277 | fSignals=0; |
278 | } |
5f25234b |
279 | if (fHypotheses) |
f531a546 |
280 | { |
5f25234b |
281 | delete fHypotheses; |
282 | fHypotheses=0; |
f531a546 |
283 | } |
c72198f1 |
284 | if (fBegin) |
285 | { |
286 | delete fBegin; |
287 | fBegin=0; |
288 | } |
289 | if (fEnd) |
290 | { |
291 | delete fEnd; |
292 | fEnd=0; |
293 | } |
c5555bc0 |
294 | if (fRef) |
295 | { |
296 | delete fRef; |
297 | fRef=0; |
298 | } |
c72198f1 |
299 | if (fImpactXY) |
300 | { |
301 | delete fImpactXY; |
302 | fImpactXY=0; |
303 | } |
304 | if (fImpactXZ) |
305 | { |
306 | delete fImpactXZ; |
307 | fImpactXZ=0; |
308 | } |
309 | if (fImpactYZ) |
310 | { |
311 | delete fImpactYZ; |
312 | fImpactYZ=0; |
313 | } |
314 | if (fClosest) |
315 | { |
316 | delete fClosest; |
317 | fClosest=0; |
318 | } |
ea0b5b7f |
319 | if (fFit) |
320 | { |
321 | delete fFit; |
322 | fFit=0; |
323 | } |
a7dc0627 |
324 | if (fTstamp) |
325 | { |
326 | delete fTstamp; |
327 | fTstamp=0; |
328 | } |
d88f97cc |
329 | } |
330 | /////////////////////////////////////////////////////////////////////////// |
331 | void AliTrack::Set3Momentum(Ali3Vector& p) |
332 | { |
261c0caf |
333 | // Set the track parameters according to the 3-momentum p. |
334 | // In case the mass was not yet set, the energy is set to correspond to m=0. |
959fbac5 |
335 | Set3Vector(p); |
261c0caf |
336 | Double_t inv=GetInvariant(); |
337 | if (inv<0) SetMass(0.); |
d88f97cc |
338 | } |
339 | /////////////////////////////////////////////////////////////////////////// |
340 | void AliTrack::Set4Momentum(Ali4Vector& p) |
341 | { |
342 | // Set the track parameters according to the 4-momentum p |
343 | Double_t E=p.GetScalar(); |
959fbac5 |
344 | Double_t dE=p.GetResultError(); |
d88f97cc |
345 | Ali3Vector pv=p.Get3Vector(); |
346 | SetVector(E,pv); |
959fbac5 |
347 | SetScalarError(dE); |
d88f97cc |
348 | } |
349 | /////////////////////////////////////////////////////////////////////////// |
959fbac5 |
350 | void AliTrack::SetMass(Double_t m,Double_t dm) |
d88f97cc |
351 | { |
352 | // Set the particle mass |
959fbac5 |
353 | // The default value for the error dm is 0. |
354 | Double_t inv=pow(m,2); |
355 | Double_t dinv=fabs(2.*m*dm); |
356 | SetInvariant(inv,dinv); |
d88f97cc |
357 | } |
358 | /////////////////////////////////////////////////////////////////////////// |
359 | void AliTrack::SetCharge(Float_t q) |
360 | { |
361 | // Set the particle charge |
362 | fQ=q; |
363 | } |
364 | /////////////////////////////////////////////////////////////////////////// |
1f241680 |
365 | void AliTrack::Data(TString f,TString u) |
d88f97cc |
366 | { |
367 | // Provide track information within the coordinate frame f |
1f241680 |
368 | // |
369 | // The string argument "u" allows to choose between different angular units |
370 | // in case e.g. a spherical frame is selected. |
371 | // u = "rad" : angles provided in radians |
372 | // "deg" : angles provided in degrees |
373 | // |
374 | // The defaults are f="car" and u="rad". |
375 | |
959fbac5 |
376 | Double_t m=GetMass(); |
377 | Double_t dm=GetResultError(); |
5f25234b |
378 | const char* name=GetName(); |
379 | const char* title=GetTitle(); |
380 | |
381 | cout << " *" << ClassName() << "::Data*"; |
ea0b5b7f |
382 | if (strlen(name)) cout << " Name : " << name; |
383 | if (strlen(title)) cout << " Title : " << title; |
5f25234b |
384 | cout << endl; |
a7dc0627 |
385 | if (fTstamp) fTstamp->Date(1); |
5f25234b |
386 | cout << " Id : " << fUserId << " Code : " << fCode |
387 | << " m : " << m << " dm : " << dm << " Charge : " << fQ |
388 | << " p : " << GetMomentum() << endl; |
389 | cout << " Nhypotheses : " << GetNhypotheses() << " Ndecay-tracks : " << GetNdecay() |
390 | << " Nsignals : " << GetNsignals() << endl; |
ea0b5b7f |
391 | if (fParent) |
392 | { |
393 | cout << " Parent track Id : " << fParent->GetId() << " Code : " << fParent->GetParticleCode() |
394 | << " m : " << fParent->GetMass() << " Q : " << fParent->GetCharge() |
395 | << " p : " << fParent->GetMomentum(); |
396 | const char* pname=fParent->GetName(); |
397 | const char* ptitle=fParent->GetTitle(); |
398 | if (strlen(pname)) cout << " Name : " << pname; |
399 | if (strlen(ptitle)) cout << " Title : " << ptitle; |
400 | cout << endl; |
401 | } |
402 | if (fFit) |
403 | { |
404 | cout << " Fit details present in object of class " << fFit->ClassName() << endl; |
405 | if (fFit->InheritsFrom("AliSignal")) ((AliSignal*)fFit)->List(-1); |
406 | } |
1f241680 |
407 | Ali4Vector::Data(f,u); |
d88f97cc |
408 | } |
409 | /////////////////////////////////////////////////////////////////////////// |
1f241680 |
410 | void AliTrack::List(TString f,TString u) |
d88f97cc |
411 | { |
412 | // Provide current track and decay level 1 information within coordinate frame f |
1f241680 |
413 | // |
414 | // The string argument "u" allows to choose between different angular units |
415 | // in case e.g. a spherical frame is selected. |
416 | // u = "rad" : angles provided in radians |
417 | // "deg" : angles provided in degrees |
418 | // |
419 | // The defaults are f="car" and u="rad". |
d88f97cc |
420 | |
1f241680 |
421 | Data(f,u); // Information of the current track |
e51b7d1a |
422 | if (fBegin) { cout << " Begin-point :"; fBegin->Data(f,u); } |
423 | if (fEnd) { cout << " End-point :"; fEnd->Data(f,u); } |
424 | if (fRef) { cout << " Ref-point :"; fRef->Data(f,u); } |
d88f97cc |
425 | |
426 | // Decay products of this track |
427 | AliTrack* td; |
5f25234b |
428 | for (Int_t id=1; id<=GetNdecay(); id++) |
d88f97cc |
429 | { |
430 | td=GetDecayTrack(id); |
431 | if (td) |
432 | { |
433 | cout << " ---Level 1 sec. track no. " << id << endl; |
1f241680 |
434 | td->Data(f,u); |
d88f97cc |
435 | } |
436 | else |
437 | { |
5f25234b |
438 | cout << " *AliTrack::List* Error : Empty decay track slot." << endl; |
d88f97cc |
439 | } |
440 | } |
441 | } |
442 | /////////////////////////////////////////////////////////////////////////// |
1f241680 |
443 | void AliTrack::ListAll(TString f,TString u) |
d88f97cc |
444 | { |
445 | // Provide complete track and decay information within the coordinate frame f |
1f241680 |
446 | // |
447 | // The string argument "u" allows to choose between different angular units |
448 | // in case e.g. a spherical frame is selected. |
449 | // u = "rad" : angles provided in radians |
450 | // "deg" : angles provided in degrees |
451 | // |
452 | // The defaults are f="car" and u="rad". |
d88f97cc |
453 | |
1f241680 |
454 | Data(f,u); // Information of the current track |
e51b7d1a |
455 | if (fBegin) { cout << " Begin-point :"; fBegin->Data(f,u); } |
456 | if (fEnd) { cout << " End-point :"; fEnd->Data(f,u); } |
457 | if (fRef) { cout << " Ref-point :"; fRef->Data(f,u); } |
5f25234b |
458 | |
459 | Int_t nhyp=GetNhypotheses(); |
460 | if (nhyp) |
461 | { |
462 | cout << " List of the " << nhyp << " track hypotheses : " << endl; |
463 | for (Int_t ih=1; ih<=nhyp; ih++) |
464 | { |
465 | AliTrack* tx=GetTrackHypothesis(ih); |
1f241680 |
466 | if (tx) tx->Data(f,u); |
5f25234b |
467 | } |
468 | } |
469 | |
470 | Int_t nsig=GetNsignals(); |
471 | if (nsig) |
959fbac5 |
472 | { |
d0a8ef71 |
473 | cout << " List of the corresponding slots for the " << nsig |
474 | << " related signals : " << endl; |
475 | AliPosition r; |
476 | Int_t nrefs,jslot; |
477 | TArrayI slotarr; |
5f25234b |
478 | for (Int_t is=1; is<=nsig; is++) |
479 | { |
480 | AliSignal* sx=GetSignal(is); |
d0a8ef71 |
481 | if (sx) |
482 | { |
483 | nrefs=sx->GetIndices(this,slotarr,0); |
484 | for (Int_t jref=0; jref<nrefs; jref++) |
485 | { |
486 | jslot=slotarr.At(jref); |
487 | sx->List(jslot); |
488 | } |
489 | r=sx->GetPosition(); |
490 | cout << " Position"; |
1f241680 |
491 | r.Data(f,u); |
d0a8ef71 |
492 | } |
5f25234b |
493 | } |
959fbac5 |
494 | } |
d88f97cc |
495 | |
496 | AliTrack* t=this; |
1f241680 |
497 | Dumps(t,1,f,u); // Information of all decay products |
d88f97cc |
498 | } |
499 | ////////////////////////////////////////////////////////////////////////// |
1f241680 |
500 | void AliTrack::Dumps(AliTrack* t,Int_t n,TString f,TString u) |
d88f97cc |
501 | { |
502 | // Recursively provide the info of all decay levels of this track |
503 | AliTrack* td; |
504 | for (Int_t id=1; id<=t->GetNdecay(); id++) |
505 | { |
506 | td=t->GetDecayTrack(id); |
507 | if (td) |
508 | { |
509 | cout << " ---Level " << n << " sec. track no. " << id << endl; |
1f241680 |
510 | td->Data(f,u); |
5f25234b |
511 | |
512 | Int_t nhyp=td->GetNhypotheses(); |
513 | if (nhyp) |
514 | { |
515 | cout << " List of the " << nhyp << " track hypotheses : " << endl; |
516 | for (Int_t ih=1; ih<=nhyp; ih++) |
517 | { |
518 | AliTrack* tx=td->GetTrackHypothesis(ih); |
1f241680 |
519 | if (tx) tx->Data(f,u); |
5f25234b |
520 | } |
521 | } |
522 | |
523 | Int_t nsig=td->GetNsignals(); |
524 | if (nsig) |
959fbac5 |
525 | { |
5f25234b |
526 | cout << " List of the " << nsig << " related signals : " << endl; |
527 | for (Int_t is=1; is<=nsig; is++) |
528 | { |
529 | AliSignal* sx=td->GetSignal(is); |
1f241680 |
530 | if (sx) sx->Data(f,u); |
5f25234b |
531 | } |
959fbac5 |
532 | } |
d88f97cc |
533 | |
534 | // Go for next decay level of this decay track recursively |
1f241680 |
535 | Dumps(td,n+1,f,u); |
d88f97cc |
536 | } |
537 | else |
538 | { |
5f25234b |
539 | cout << " *AliTrack::Dumps* Error : Empty decay track slot." << endl; |
d88f97cc |
540 | } |
541 | } |
542 | } |
543 | ////////////////////////////////////////////////////////////////////////// |
544 | Double_t AliTrack::GetMomentum() |
545 | { |
959fbac5 |
546 | // Provide the value of the track 3-momentum. |
547 | // The error can be obtained by invoking GetResultError() after |
548 | // invokation of GetMomentum(). |
959fbac5 |
549 | Double_t norm=fV.GetNorm(); |
d071d629 |
550 | fDresult=fV.GetResultError(); |
959fbac5 |
551 | return norm; |
d88f97cc |
552 | } |
553 | /////////////////////////////////////////////////////////////////////////// |
261c0caf |
554 | Ali3Vector AliTrack::Get3Momentum() const |
d88f97cc |
555 | { |
556 | // Provide the track 3-momentum |
557 | return (Ali3Vector)Get3Vector(); |
558 | } |
559 | /////////////////////////////////////////////////////////////////////////// |
560 | Double_t AliTrack::GetMass() |
561 | { |
959fbac5 |
562 | // Provide the particle mass. |
563 | // The error can be obtained by invoking GetResultError() after |
564 | // invokation of GetMass(). |
565 | Double_t inv=GetInvariant(); |
566 | Double_t dinv=GetResultError(); |
567 | Double_t dm=0; |
568 | if (inv >= 0) |
569 | { |
570 | Double_t m=sqrt(inv); |
571 | if (m) dm=dinv/(2.*m); |
572 | fDresult=dm; |
573 | return m; |
574 | } |
575 | else |
576 | { |
577 | cout << "*AliTrack::GetMass* Unphysical situation m**2 = " << inv << endl; |
578 | cout << " Value 0 will be returned." << endl; |
579 | fDresult=dm; |
580 | return 0; |
581 | } |
d88f97cc |
582 | } |
583 | /////////////////////////////////////////////////////////////////////////// |
261c0caf |
584 | Float_t AliTrack::GetCharge() const |
d88f97cc |
585 | { |
586 | // Provide the particle charge |
587 | return fQ; |
588 | } |
589 | /////////////////////////////////////////////////////////////////////////// |
590 | Double_t AliTrack::GetEnergy() |
591 | { |
959fbac5 |
592 | // Provide the particle's energy. |
593 | // The error can be obtained by invoking GetResultError() after |
594 | // invokation of GetEnergy(). |
595 | Double_t E=GetScalar(); |
596 | if (E>0) |
597 | { |
598 | return E; |
599 | } |
600 | else |
601 | { |
602 | cout << "*AliTrack::GetEnergy* Unphysical situation E = " << E << endl; |
603 | cout << " Value 0 will be returned." << endl; |
604 | return 0; |
605 | } |
d88f97cc |
606 | } |
607 | /////////////////////////////////////////////////////////////////////////// |
608 | void AliTrack::Decay(Double_t m1,Double_t m2,Double_t thcms,Double_t phicms) |
609 | { |
610 | // Perform 2-body decay of current track |
611 | // m1 : mass of decay product 1 |
612 | // m2 : mass of decay product 2 |
613 | // thcms : cms theta decay angle (in rad.) of m1 |
614 | // phicms : cms phi decay angle (in rad.) of m1 |
615 | |
959fbac5 |
616 | Double_t M=GetMass(); |
d88f97cc |
617 | |
618 | // Compute the 4-momenta of the decay products in the cms |
619 | // Note : p2=p1=pnorm for a 2-body decay |
959fbac5 |
620 | Double_t e1=0; |
621 | if (M) e1=((M*M)+(m1*m1)-(m2*m2))/(2.*M); |
622 | Double_t e2=0; |
623 | if (M) e2=((M*M)+(m2*m2)-(m1*m1))/(2.*M); |
d88f97cc |
624 | Double_t pnorm=(e1*e1)-(m1*m1); |
625 | if (pnorm>0.) |
626 | { |
627 | pnorm=sqrt(pnorm); |
628 | } |
629 | else |
630 | { |
631 | pnorm=0; |
632 | } |
633 | |
634 | Double_t a[3]; |
635 | a[0]=pnorm; |
636 | a[1]=thcms; |
637 | a[2]=phicms; |
638 | Ali3Vector p; |
639 | p.SetVector(a,"sph"); |
640 | |
641 | Ali4Vector pprim1; |
642 | pprim1.SetVector(e1,p); |
959fbac5 |
643 | pprim1.SetInvariant(m1*m1); |
d88f97cc |
644 | |
645 | Ali4Vector pprim2; |
646 | p*=-1; |
647 | pprim2.SetVector(e2,p); |
959fbac5 |
648 | pprim2.SetInvariant(m2*m2); |
d88f97cc |
649 | |
650 | // Determine boost parameters from the parent particle |
959fbac5 |
651 | Double_t E=GetEnergy(); |
d88f97cc |
652 | p=Get3Vector(); |
653 | Ali4Vector pmu; |
654 | pmu.SetVector(E,p); |
655 | |
656 | AliBoost q; |
657 | q.Set4Momentum(pmu); |
658 | |
659 | Ali4Vector p1=q.Inverse(pprim1); // Boost decay product 1 |
660 | Ali4Vector p2=q.Inverse(pprim2); // Boost decay product 2 |
661 | |
662 | // Enter the boosted data into the decay tracks array |
663 | if (fDecays) |
664 | { |
d88f97cc |
665 | delete fDecays; |
6516b62d |
666 | fDecays=0; |
d88f97cc |
667 | } |
5f25234b |
668 | fDecays=new TObjArray(2); |
6516b62d |
669 | fDecays->SetOwner(); |
d88f97cc |
670 | |
671 | fDecays->Add(new AliTrack); |
672 | ((AliTrack*)fDecays->At(0))->Set4Momentum(p1); |
959fbac5 |
673 | ((AliTrack*)fDecays->At(0))->SetMass(m1); |
d88f97cc |
674 | fDecays->Add(new AliTrack); |
675 | ((AliTrack*)fDecays->At(1))->Set4Momentum(p2); |
d88f97cc |
676 | ((AliTrack*)fDecays->At(1))->SetMass(m2); |
677 | } |
678 | /////////////////////////////////////////////////////////////////////////// |
261c0caf |
679 | Int_t AliTrack::GetNdecay() const |
d88f97cc |
680 | { |
681 | // Provide the number of decay produced tracks |
5f25234b |
682 | Int_t ndec=0; |
683 | if (fDecays) ndec=fDecays->GetEntries(); |
684 | return ndec; |
d88f97cc |
685 | } |
686 | /////////////////////////////////////////////////////////////////////////// |
261c0caf |
687 | AliTrack* AliTrack::GetDecayTrack(Int_t j) const |
d88f97cc |
688 | { |
689 | // Provide decay produced track number j |
690 | // Note : j=1 denotes the first decay track |
6516b62d |
691 | if (!fDecays) |
d88f97cc |
692 | { |
6516b62d |
693 | cout << " *AliTrack::GetDecayTrack* No tracks present." << endl; |
694 | return 0; |
d88f97cc |
695 | } |
696 | else |
697 | { |
5f25234b |
698 | if ((j >= 1) && (j <= GetNdecay())) |
6516b62d |
699 | { |
700 | return (AliTrack*)fDecays->At(j-1); |
701 | } |
702 | else |
703 | { |
704 | cout << " *AliTrack* decay track number : " << j << " out of range." |
5f25234b |
705 | << " Ndec = " << GetNdecay() << endl; |
6516b62d |
706 | return 0; |
707 | } |
d88f97cc |
708 | } |
709 | } |
710 | /////////////////////////////////////////////////////////////////////////// |
5f25234b |
711 | void AliTrack::RemoveDecays() |
712 | { |
713 | // Remove all decay tracks from this track. |
714 | if (fDecays) |
715 | { |
716 | delete fDecays; |
717 | fDecays=0; |
718 | } |
719 | } |
720 | /////////////////////////////////////////////////////////////////////////// |
959fbac5 |
721 | void AliTrack::AddSignal(AliSignal& s) |
722 | { |
723 | // Relate an AliSignal object to this track. |
5f25234b |
724 | if (!fSignals) fSignals=new TObjArray(1); |
725 | |
726 | // Check if this signal is already stored for this track |
727 | Int_t nsig=GetNsignals(); |
728 | for (Int_t i=0; i<nsig; i++) |
729 | { |
730 | if (&s==fSignals->At(i)) return; |
731 | } |
732 | |
959fbac5 |
733 | fSignals->Add(&s); |
734 | } |
735 | /////////////////////////////////////////////////////////////////////////// |
736 | void AliTrack::RemoveSignal(AliSignal& s) |
737 | { |
5f25234b |
738 | // Remove related AliSignal object from this track. |
959fbac5 |
739 | if (fSignals) |
740 | { |
741 | AliSignal* test=(AliSignal*)fSignals->Remove(&s); |
5f25234b |
742 | if (test) fSignals->Compress(); |
743 | } |
744 | } |
745 | /////////////////////////////////////////////////////////////////////////// |
746 | void AliTrack::RemoveSignals() |
747 | { |
748 | // Remove all related AliSignal objects from this track. |
749 | if (fSignals) |
750 | { |
751 | fSignals->Clear(); |
752 | delete fSignals; |
753 | fSignals=0; |
959fbac5 |
754 | } |
755 | } |
756 | /////////////////////////////////////////////////////////////////////////// |
261c0caf |
757 | Int_t AliTrack::GetNsignals() const |
959fbac5 |
758 | { |
759 | // Provide the number of related AliSignals. |
5f25234b |
760 | Int_t nsig=0; |
761 | if (fSignals) nsig=fSignals->GetEntries(); |
762 | return nsig; |
959fbac5 |
763 | } |
764 | /////////////////////////////////////////////////////////////////////////// |
261c0caf |
765 | AliSignal* AliTrack::GetSignal(Int_t j) const |
959fbac5 |
766 | { |
767 | // Provide the related AliSignal number j. |
768 | // Note : j=1 denotes the first signal. |
6516b62d |
769 | if (!fSignals) |
959fbac5 |
770 | { |
6516b62d |
771 | cout << " *AliTrack::GetSignal* No signals present." << endl; |
772 | return 0; |
959fbac5 |
773 | } |
774 | else |
775 | { |
5f25234b |
776 | if ((j >= 1) && (j <= GetNsignals())) |
6516b62d |
777 | { |
778 | return (AliSignal*)fSignals->At(j-1); |
779 | } |
780 | else |
781 | { |
782 | cout << " *AliTrack* signal number : " << j << " out of range." |
5f25234b |
783 | << " Nsig = " << GetNsignals() << endl; |
6516b62d |
784 | return 0; |
785 | } |
959fbac5 |
786 | } |
787 | } |
788 | /////////////////////////////////////////////////////////////////////////// |
5f25234b |
789 | void AliTrack::AddTrackHypothesis(AliTrack& t) |
959fbac5 |
790 | { |
5f25234b |
791 | // Relate a track hypothesis to this track. |
792 | // Note : a private copy of the input track will be made via the Clone() |
793 | // facility. |
794 | if (!fHypotheses) |
c72198f1 |
795 | { |
5f25234b |
796 | fHypotheses=new TObjArray(1); |
797 | fHypotheses->SetOwner(); |
c72198f1 |
798 | } |
5f25234b |
799 | fHypotheses->Add(t.Clone()); |
959fbac5 |
800 | } |
801 | /////////////////////////////////////////////////////////////////////////// |
5f25234b |
802 | void AliTrack::AddTrackHypothesis(Double_t prob,Double_t m,Double_t dm) |
959fbac5 |
803 | { |
5f25234b |
804 | // Add a track hypothesis by explicitly setting the mass and probability. |
805 | // This will affect e.g. the hypothesis track's energy, since the momentum |
806 | // and all other attributes will be copied from the current track. |
807 | // |
808 | // Input arguments : |
809 | // ----------------- |
810 | // prob=probalility m=mass value dm=error on the mass value. |
811 | // The default value for the mass error dm is 0. |
812 | |
813 | AliTrack t(*this); |
814 | t.RemoveDecays(); |
815 | t.RemoveTrackHypotheses(); |
816 | t.RemoveSignals(); |
817 | t.SetTitle("Mass hypothesis"); |
818 | t.SetMass(m,dm); |
819 | t.SetProb(prob); |
820 | AddTrackHypothesis(t); |
959fbac5 |
821 | } |
822 | /////////////////////////////////////////////////////////////////////////// |
5f25234b |
823 | void AliTrack::RemoveTrackHypothesis(AliTrack& t) |
959fbac5 |
824 | { |
5f25234b |
825 | // Remove the specified track hypothesis from this track. |
826 | if (fHypotheses) |
c72198f1 |
827 | { |
5f25234b |
828 | AliTrack* test=(AliTrack*)fHypotheses->Remove(&t); |
829 | if (test) fHypotheses->Compress(); |
c72198f1 |
830 | } |
959fbac5 |
831 | } |
832 | /////////////////////////////////////////////////////////////////////////// |
5f25234b |
833 | void AliTrack::RemoveTrackHypotheses() |
959fbac5 |
834 | { |
5f25234b |
835 | // Remove all track hypotheses from this track. |
836 | if (fHypotheses) |
837 | { |
838 | delete fHypotheses; |
839 | fHypotheses=0; |
840 | } |
f531a546 |
841 | } |
842 | /////////////////////////////////////////////////////////////////////////// |
261c0caf |
843 | Int_t AliTrack::GetNhypotheses() const |
f531a546 |
844 | { |
5f25234b |
845 | // Provide the number of track hypotheses. |
846 | Int_t nhyp=0; |
847 | if (fHypotheses) nhyp=fHypotheses->GetEntries(); |
848 | return nhyp; |
f531a546 |
849 | } |
850 | /////////////////////////////////////////////////////////////////////////// |
261c0caf |
851 | AliTrack* AliTrack::GetTrackHypothesis(Int_t j) const |
f531a546 |
852 | { |
5f25234b |
853 | // Provide the j-th track hypothesis. |
854 | // Note : j=1 denotes the first hypothesis. |
f531a546 |
855 | // Default : j=0 ==> Hypothesis with highest probability. |
f531a546 |
856 | |
5f25234b |
857 | if (!fHypotheses) return 0; |
858 | |
859 | Int_t nhyp=GetNhypotheses(); |
f531a546 |
860 | |
861 | // Check validity of index j |
5f25234b |
862 | if (j<0 || j>nhyp) |
f531a546 |
863 | { |
5f25234b |
864 | cout << " *AliTrack* hypothesis number : " << j << " out of range." |
865 | << " Nhyp = " << nhyp << endl; |
866 | return 0; |
867 | } |
f531a546 |
868 | |
5f25234b |
869 | AliTrack* t=0; |
870 | |
871 | if (j==0) // Provide track hypothesis with highest probability |
f531a546 |
872 | { |
5f25234b |
873 | Float_t prob=0; |
874 | t=(AliTrack*)fHypotheses->At(0); |
875 | if (t) prob=t->GetProb(); |
876 | Float_t probx=0; |
877 | for (Int_t ih=1; ih<nhyp; ih++) |
f531a546 |
878 | { |
5f25234b |
879 | AliTrack* tx=(AliTrack*)fHypotheses->At(ih); |
880 | if (tx) |
f531a546 |
881 | { |
5f25234b |
882 | probx=tx->GetProb(); |
883 | if (probx > prob) t=tx; |
f531a546 |
884 | } |
885 | } |
5f25234b |
886 | return t; |
887 | } |
888 | else // Provide requested j-th track hypothesis |
889 | { |
890 | return (AliTrack*)fHypotheses->At(j-1); |
f531a546 |
891 | } |
f531a546 |
892 | } |
893 | /////////////////////////////////////////////////////////////////////////// |
5f25234b |
894 | void AliTrack::SetBeginPoint(AliPosition& p) |
f531a546 |
895 | { |
5f25234b |
896 | // Store the position of the track begin-point. |
f4d1f676 |
897 | if (fBegin) delete fBegin; |
898 | fBegin=new AliPositionObj(p); |
f531a546 |
899 | } |
900 | /////////////////////////////////////////////////////////////////////////// |
5f25234b |
901 | AliPosition* AliTrack::GetBeginPoint() |
f531a546 |
902 | { |
5f25234b |
903 | // Provide the position of the track begin-point. |
904 | return fBegin; |
905 | } |
906 | /////////////////////////////////////////////////////////////////////////// |
907 | void AliTrack::SetEndPoint(AliPosition& p) |
908 | { |
909 | // Store the position of the track end-point. |
f4d1f676 |
910 | if (fEnd) delete fEnd; |
911 | fEnd=new AliPositionObj(p); |
f531a546 |
912 | } |
913 | /////////////////////////////////////////////////////////////////////////// |
5f25234b |
914 | AliPosition* AliTrack::GetEndPoint() |
915 | { |
916 | // Provide the position of the track end-point. |
917 | return fEnd; |
918 | } |
919 | /////////////////////////////////////////////////////////////////////////// |
c5555bc0 |
920 | void AliTrack::SetReferencePoint(AliPosition& p) |
921 | { |
922 | // Store the position of the track reference-point. |
923 | // The reference-point is the point on the track in which the |
924 | // 3-momentum vector components have been defined. |
925 | // This reference point is the preferable point to start track extrapolations |
926 | // etc... which are sensitive to the components of the 3-momentum vector. |
f4d1f676 |
927 | if (fRef) delete fRef; |
928 | fRef=new AliPositionObj(p); |
c5555bc0 |
929 | } |
930 | /////////////////////////////////////////////////////////////////////////// |
931 | AliPosition* AliTrack::GetReferencePoint() |
932 | { |
933 | // Provide the position of the track reference-point. |
934 | // The reference-point is the point on the track in which the |
935 | // 3-momentum vector components have been defined. |
936 | // This reference point is the preferable point to start track extrapolations |
937 | // etc... which are sensitive to the components of the 3-momentum vector. |
938 | return fRef; |
939 | } |
940 | /////////////////////////////////////////////////////////////////////////// |
5f25234b |
941 | void AliTrack::SetMass() |
f531a546 |
942 | { |
5f25234b |
943 | // Set the mass and error to the value of the hypothesis with highest prob. |
f531a546 |
944 | |
5f25234b |
945 | Double_t m=0,dm=0; |
946 | |
947 | // Select mass hypothesis with highest probability |
948 | AliTrack* t=GetTrackHypothesis(0); |
949 | if (t) |
f531a546 |
950 | { |
5f25234b |
951 | m=t->GetMass(); |
952 | dm=t->GetResultError(); |
953 | SetMass(m,dm); |
f531a546 |
954 | } |
955 | else |
956 | { |
5f25234b |
957 | cout << " *AliTrack::SetMass()* No hypothesis present => No action." << endl; |
f531a546 |
958 | } |
959 | } |
960 | /////////////////////////////////////////////////////////////////////////// |
d071d629 |
961 | Double_t AliTrack::GetPt() |
962 | { |
963 | // Provide trans. momentum value w.r.t. z-axis. |
964 | // The error on the value can be obtained by GetResultError() |
965 | // after invokation of GetPt(). |
966 | Ali3Vector v; |
967 | v=GetVecTrans(); |
968 | Double_t norm=v.GetNorm(); |
969 | fDresult=v.GetResultError(); |
970 | |
971 | return norm; |
972 | } |
973 | /////////////////////////////////////////////////////////////////////////// |
974 | Double_t AliTrack::GetPl() |
975 | { |
976 | // Provide long. momentum value w.r.t. z-axis. |
8adaf597 |
977 | // Note : the returned value can also be negative. |
d071d629 |
978 | // The error on the value can be obtained by GetResultError() |
979 | // after invokation of GetPl(). |
980 | Ali3Vector v; |
981 | v=GetVecLong(); |
8adaf597 |
982 | |
983 | Double_t pl=v.GetNorm(); |
d071d629 |
984 | fDresult=v.GetResultError(); |
985 | |
8adaf597 |
986 | Double_t a[3]; |
987 | v.GetVector(a,"sph"); |
988 | if (cos(a[1])<0) pl=-pl; |
989 | |
990 | return pl; |
d071d629 |
991 | } |
992 | /////////////////////////////////////////////////////////////////////////// |
993 | Double_t AliTrack::GetEt() |
994 | { |
995 | // Provide trans. energy value w.r.t. z-axis. |
996 | // The error on the value can be obtained by GetResultError() |
997 | // after invokation of GetEt(). |
998 | Double_t et=GetScaTrans(); |
999 | |
1000 | return et; |
1001 | } |
1002 | /////////////////////////////////////////////////////////////////////////// |
1003 | Double_t AliTrack::GetEl() |
1004 | { |
1005 | // Provide long. energy value w.r.t. z-axis. |
8adaf597 |
1006 | // Note : the returned value can also be negative. |
d071d629 |
1007 | // The error on the value can be obtained by GetResultError() |
1008 | // after invokation of GetEl(). |
1009 | Double_t el=GetScaLong(); |
1010 | |
1011 | return el; |
1012 | } |
1013 | /////////////////////////////////////////////////////////////////////////// |
1014 | Double_t AliTrack::GetMt() |
1015 | { |
1016 | // Provide transverse mass value w.r.t. z-axis. |
1017 | // The error on the value can be obtained by GetResultError() |
1018 | // after invokation of GetMt(). |
1019 | Double_t pt=GetPt(); |
1020 | Double_t dpt=GetResultError(); |
1021 | Double_t m=GetMass(); |
1022 | Double_t dm=GetResultError(); |
1023 | |
1024 | Double_t mt=sqrt(pt*pt+m*m); |
1025 | Double_t dmt2=0; |
1026 | if (mt) dmt2=(pow((pt*dpt),2)+pow((m*dm),2))/(mt*mt); |
1027 | |
1028 | fDresult=sqrt(dmt2); |
1029 | return mt; |
1030 | } |
1031 | /////////////////////////////////////////////////////////////////////////// |
8adaf597 |
1032 | Double_t AliTrack::GetRapidity() |
1033 | { |
1034 | // Provide rapidity value w.r.t. z-axis. |
1035 | // The error on the value can be obtained by GetResultError() |
1036 | // after invokation of GetRapidity(). |
1037 | // Note : Also GetPseudoRapidity() is available since this class is |
1038 | // derived from Ali4Vector. |
1039 | Double_t e=GetEnergy(); |
1040 | Double_t de=GetResultError(); |
1041 | Double_t pl=GetPl(); |
1042 | Double_t dpl=GetResultError(); |
1043 | Double_t sum=e+pl; |
1044 | Double_t dif=e-pl; |
1045 | |
1046 | Double_t y=9999,dy2=0; |
1047 | if (sum && dif) y=0.5*log(sum/dif); |
1048 | |
1049 | if (sum*dif) dy2=(1./(sum*dif))*(pow((pl*de),2)+pow((e*dpl),2)); |
1050 | |
1051 | fDresult=sqrt(dy2); |
1052 | return y; |
1053 | } |
1054 | /////////////////////////////////////////////////////////////////////////// |
c72198f1 |
1055 | void AliTrack::SetImpactPoint(AliPosition& p,TString q) |
43bfa5be |
1056 | { |
1057 | // Store the position of the impact-point in the plane "q=0". |
1058 | // Here q denotes one of the axes X, Y or Z. |
1059 | // Note : The character to denote the axis may be entered in lower or |
1060 | // in uppercase. |
1061 | Int_t axis=0; |
1062 | if (q=="x" || q=="X") axis=1; |
1063 | if (q=="y" || q=="Y") axis=2; |
1064 | if (q=="z" || q=="Z") axis=3; |
1065 | |
1066 | switch (axis) |
1067 | { |
1068 | case 1: // Impact-point in the plane X=0 |
f4d1f676 |
1069 | if (fImpactYZ) delete fImpactYZ; |
1070 | fImpactYZ=new AliPositionObj(p); |
43bfa5be |
1071 | break; |
1072 | |
1073 | case 2: // Impact-point in the plane Y=0 |
f4d1f676 |
1074 | if (fImpactXZ) delete fImpactXZ; |
1075 | fImpactXZ=new AliPositionObj(p); |
43bfa5be |
1076 | break; |
1077 | |
1078 | case 3: // Impact-point in the plane Z=0 |
f4d1f676 |
1079 | if (fImpactXY) delete fImpactXY; |
1080 | fImpactXY=new AliPositionObj(p); |
43bfa5be |
1081 | break; |
1082 | |
1083 | default: // Unsupported axis |
1084 | cout << "*AliTrack::SetImpactPoint* Unsupported axis : " << q << endl |
1085 | << " Possible axes are 'X', 'Y' and 'Z'." << endl; |
1086 | break; |
1087 | } |
1088 | } |
1089 | /////////////////////////////////////////////////////////////////////////// |
c72198f1 |
1090 | AliPosition* AliTrack::GetImpactPoint(TString q) |
43bfa5be |
1091 | { |
1092 | // Provide the position of the impact-point in the plane "q=0". |
1093 | // Here q denotes one of the axes X, Y or Z. |
1094 | // Note : The character to denote the axis may be entered in lower or |
1095 | // in uppercase. |
43bfa5be |
1096 | Int_t axis=0; |
1097 | if (q=="x" || q=="X") axis=1; |
1098 | if (q=="y" || q=="Y") axis=2; |
1099 | if (q=="z" || q=="Z") axis=3; |
1100 | |
1101 | switch (axis) |
1102 | { |
1103 | case 1: // Impact-point in the plane X=0 |
1104 | return fImpactYZ; |
1105 | |
1106 | case 2: // Impact-point in the plane Y=0 |
1107 | return fImpactXZ; |
1108 | |
1109 | case 3: // Impact-point in the plane Z=0 |
1110 | return fImpactXY; |
1111 | |
1112 | default: // Unsupported axis |
1113 | cout << "*AliTrack::GetImpactPoint* Unsupported axis : " << q << endl |
1114 | << " Possible axes are 'X', 'Y' and 'Z'." << endl; |
c72198f1 |
1115 | return 0; |
43bfa5be |
1116 | } |
1117 | } |
1118 | /////////////////////////////////////////////////////////////////////////// |
1119 | void AliTrack::SetId(Int_t id) |
1120 | { |
fdbea0ce |
1121 | // Set a user defined unique identifier for this track. |
43bfa5be |
1122 | fUserId=id; |
1123 | } |
1124 | /////////////////////////////////////////////////////////////////////////// |
261c0caf |
1125 | Int_t AliTrack::GetId() const |
43bfa5be |
1126 | { |
fdbea0ce |
1127 | // Provide the user defined unique identifier of this track. |
43bfa5be |
1128 | return fUserId; |
1129 | } |
1130 | /////////////////////////////////////////////////////////////////////////// |
c72198f1 |
1131 | void AliTrack::SetClosestPoint(AliPosition& p) |
43bfa5be |
1132 | { |
1133 | // Set position p as the point of closest approach w.r.t. some reference |
f4d1f676 |
1134 | if (fClosest) delete fClosest; |
1135 | fClosest=new AliPositionObj(p); |
43bfa5be |
1136 | } |
1137 | /////////////////////////////////////////////////////////////////////////// |
c72198f1 |
1138 | AliPosition* AliTrack::GetClosestPoint() |
43bfa5be |
1139 | { |
1140 | // Provide the point of closest approach w.r.t. some reference |
1141 | return fClosest; |
1142 | } |
1143 | /////////////////////////////////////////////////////////////////////////// |
2693cb4e |
1144 | void AliTrack::SetChi2(Float_t chi2) |
1145 | { |
1146 | // Set the chi-squared value of the track fit. |
1147 | if (chi2<0) |
1148 | { |
1149 | cout << " *AliTrack::SetChi2* Invalid chi2 value : " << chi2 << endl; |
1150 | } |
1151 | else |
1152 | { |
1153 | fChi2=chi2; |
1154 | } |
1155 | } |
1156 | /////////////////////////////////////////////////////////////////////////// |
1157 | void AliTrack::SetNdf(Int_t ndf) |
1158 | { |
1159 | // Set the number of degrees of freedom for the track fit. |
1160 | if (ndf<0) |
1161 | { |
1162 | cout << " *AliTrack::SetNdf* Invalid ndf value : " << ndf << endl; |
1163 | } |
1164 | else |
1165 | { |
1166 | fNdf=ndf; |
1167 | } |
1168 | } |
1169 | /////////////////////////////////////////////////////////////////////////// |
261c0caf |
1170 | Float_t AliTrack::GetChi2() const |
2693cb4e |
1171 | { |
1172 | // Provide the chi-squared value of the track fit. |
1173 | return fChi2; |
1174 | } |
1175 | /////////////////////////////////////////////////////////////////////////// |
261c0caf |
1176 | Int_t AliTrack::GetNdf() const |
2693cb4e |
1177 | { |
1178 | // Provide the number of degrees of freedom for the track fit. |
1179 | return fNdf; |
1180 | } |
1181 | /////////////////////////////////////////////////////////////////////////// |
fdbea0ce |
1182 | void AliTrack::SetParticleCode(Int_t code) |
1183 | { |
1184 | // Set the user defined particle id code (e.g. the PDF convention). |
1185 | fCode=code; |
1186 | } |
1187 | /////////////////////////////////////////////////////////////////////////// |
261c0caf |
1188 | Int_t AliTrack::GetParticleCode() const |
fdbea0ce |
1189 | { |
1190 | // Provide the user defined particle id code. |
1191 | return fCode; |
1192 | } |
1193 | /////////////////////////////////////////////////////////////////////////// |
1fbffa23 |
1194 | void AliTrack::SetParentTrack(AliTrack* t) |
1195 | { |
1196 | // Set pointer to the parent track. |
1197 | fParent=t; |
1198 | } |
1199 | /////////////////////////////////////////////////////////////////////////// |
1200 | AliTrack* AliTrack::GetParentTrack() |
1201 | { |
1202 | // Provide pointer to the parent track. |
1203 | return fParent; |
1204 | } |
1205 | /////////////////////////////////////////////////////////////////////////// |
5f25234b |
1206 | void AliTrack::SetProb(Double_t prob) |
1207 | { |
1208 | // Set hypothesis probability for this track. |
1209 | fProb=prob; |
1210 | } |
1211 | /////////////////////////////////////////////////////////////////////////// |
261c0caf |
1212 | Float_t AliTrack::GetProb() const |
5f25234b |
1213 | { |
1214 | // Provide the hypothesis probability for this track. |
1215 | return fProb; |
1216 | } |
1217 | /////////////////////////////////////////////////////////////////////////// |
ea0b5b7f |
1218 | void AliTrack::SetFitDetails(TObject* obj) |
1219 | { |
1220 | // Enter the object containing the fit details. |
1221 | // In case an object to hold fit details was already present, this |
1222 | // will be deleted first before the new one is stored. |
1223 | // This means that SetFitDetails(0) can be used to just remove the |
1224 | // existing object with the fit details. |
1225 | // All objects derived from TObject can be entered in this way. |
1226 | // Obvious candidates for objects containing detailed fit information |
1227 | // are functions (e.g. TF1) and histograms (e.g. TH1F). |
1228 | // However, using an AliDevice object provides a very versatile facility |
1229 | // to store the parameters of various fit procedures. |
1230 | // In such a case the AliDevice can be used to provide the various fit |
1231 | // definitions and the corresponding fit parameters can be entered as |
1232 | // separate AliSignal objects which are stored as hits to the AliDevice. |
1233 | // In addition various functions and histograms can be linked to the |
1234 | // various AliSignal instances |
1235 | // The latter procedure is based on the original idea of Adam Bouchta. |
1236 | // |
1237 | // Note : The entered object is owned by this AliTrack instance. |
1238 | // As such, a private copy of obj will be stored using the Clone() |
1239 | // memberfunction. |
1240 | // In case the entered object contains pointers to other objects, |
1241 | // the user has to provide the appropriate Clone() memberfunction |
1242 | // for the class to which the entered object belongs. |
1243 | // An example can be seen from AliTrack::Clone(). |
1244 | // |
1245 | if (fFit) |
1246 | { |
1247 | delete fFit; |
1248 | fFit=0; |
1249 | } |
1250 | |
1251 | if (obj) fFit=obj->Clone(); |
1252 | } |
1253 | /////////////////////////////////////////////////////////////////////////// |
1254 | TObject* AliTrack::GetFitDetails() |
1255 | { |
1256 | // Provide the pointer to the object containing the fit details. |
1257 | return fFit; |
1258 | } |
1259 | /////////////////////////////////////////////////////////////////////////// |
a7dc0627 |
1260 | void AliTrack::SetTimestamp(AliTimestamp& t) |
1261 | { |
1262 | // Store the timestamp for this track. |
1263 | if (fTstamp) delete fTstamp; |
1264 | fTstamp=new AliTimestamp(t); |
1265 | } |
1266 | /////////////////////////////////////////////////////////////////////////// |
1267 | AliTimestamp* AliTrack::GetTimestamp() |
1268 | { |
1269 | // Provide the timestamp of this track. |
1270 | return fTstamp; |
1271 | } |
1272 | /////////////////////////////////////////////////////////////////////////// |
1273 | void AliTrack::RemoveTimestamp() |
1274 | { |
1275 | // Remove the timestamp from this track. |
1276 | if (fTstamp) |
1277 | { |
1278 | delete fTstamp; |
1279 | fTstamp=0; |
1280 | } |
1281 | } |
1282 | /////////////////////////////////////////////////////////////////////////// |
1c96d8dc |
1283 | Double_t AliTrack::GetDistance(AliPosition* p) |
1284 | { |
1285 | // Provide distance of the current track to the position p. |
1286 | // The error on the result can be obtained as usual by invoking |
1287 | // GetResultError() afterwards. |
1288 | // |
1289 | // The distance will be provided in the unit scale of the AliPosition p. |
1290 | // As such it is possible to obtain a correctly computed distance even in case |
1291 | // the track parameters have a different unit scale. |
1292 | // However, it is recommended to work always with one single unit scale. |
1293 | // |
1294 | // Note : In case of incomplete information, a distance value of -1 is |
1295 | // returned. |
1296 | |
1297 | Double_t dist=-1.; |
1298 | fDresult=0.; |
1299 | |
1300 | if (!p) return dist; |
1301 | |
1302 | // Obtain a defined position on this track |
1303 | AliPosition* rx=fRef; |
1304 | if (!rx) rx=fBegin; |
1305 | if (!rx) rx=fEnd; |
1306 | |
1307 | if (!rx) return dist; |
1308 | |
9427ac75 |
1309 | Ali3Vector p1=Get3Momentum(); |
1310 | |
1311 | if (p1.GetNorm() <= 0.) return dist; |
1312 | |
1c96d8dc |
1313 | Ali3Vector r0=(Ali3Vector)(*rx); |
1314 | |
1315 | Float_t tscale=rx->GetUnitScale(); |
1316 | Float_t pscale=p->GetUnitScale(); |
1317 | if ((tscale/pscale > 1.1) || (pscale/tscale > 1.1)) r0=r0*(tscale/pscale); |
1318 | |
1319 | // Obtain the direction unit vector of this track |
1320 | Double_t vec[3]; |
1321 | Double_t err[3]; |
1c96d8dc |
1322 | p1.GetVector(vec,"sph"); |
1323 | p1.GetErrors(err,"sph"); |
1324 | vec[0]=1.; |
1325 | err[0]=0.; |
1326 | p1.SetVector(vec,"sph"); |
1327 | p1.SetErrors(err,"sph"); |
1328 | |
1329 | Ali3Vector q=(Ali3Vector)(*p); |
1330 | Ali3Vector r=q-r0; |
1331 | Ali3Vector d=r.Cross(p1); |
1332 | dist=d.GetNorm(); |
1333 | fDresult=d.GetResultError(); |
1334 | return dist; |
1335 | } |
1336 | /////////////////////////////////////////////////////////////////////////// |
9427ac75 |
1337 | Double_t AliTrack::GetDistance(AliTrack* t) |
1338 | { |
1339 | // Provide distance of the current track to the track t. |
1340 | // The error on the result can be obtained as usual by invoking |
1341 | // GetResultError() afterwards. |
1342 | // |
1343 | // The distance will be provided in the unit scale of the current track. |
1344 | // As such it is possible to obtain a correctly computed distance even in case |
1345 | // the track parameters have a different unit scale. |
1346 | // This implies that in such cases the results of t1.GetDistance(t2) and |
1347 | // t2.GetDistance(t1) will be numerically different. |
1348 | // However, it is recommended to work always with one single unit scale. |
1349 | // |
1350 | // Note : In case of incomplete information, a distance value of -1 is |
1351 | // returned. |
1352 | |
1353 | Double_t dist=-1.; |
1354 | fDresult=0.; |
1355 | |
1356 | if (!t) return dist; |
1357 | |
1358 | // Obtain a defined position on this track |
1359 | AliPosition* rx=fRef; |
1360 | if (!rx) rx=fBegin; |
1361 | if (!rx) rx=fEnd; |
1362 | |
1363 | if (!rx) return dist; |
1364 | |
1365 | // Obtain a defined position on track t |
1366 | AliPosition* ry=t->GetReferencePoint(); |
1367 | if (!ry) ry=t->GetBeginPoint(); |
1368 | if (!ry) ry=t->GetEndPoint(); |
1369 | |
1370 | if (!ry) return dist; |
1371 | |
1372 | Ali3Vector p1=Get3Momentum(); |
1373 | Ali3Vector p2=t->Get3Momentum(); |
1374 | |
1375 | if (p1.GetNorm() <= 0. || p2.GetNorm() <= 0.) return dist; |
1376 | |
1377 | // The vector normal to both track directions |
1378 | Ali3Vector n=p1.Cross(p2); |
1379 | |
1380 | if (n.GetNorm() > 1.e-10) |
1381 | { |
1382 | // Normalise n to a unit vector |
1383 | Double_t vec[3]; |
1384 | Double_t err[3]; |
1385 | n.GetVector(vec,"sph"); |
1386 | n.GetErrors(err,"sph"); |
1387 | vec[0]=1.; |
1388 | err[0]=0.; |
1389 | n.SetVector(vec,"sph"); |
1390 | n.SetErrors(err,"sph"); |
1391 | Ali3Vector r1=(Ali3Vector)(*rx); |
1392 | Ali3Vector r2=(Ali3Vector)(*ry); |
1393 | // Correct components of r2 in case of different unit scales |
1394 | Float_t scale=rx->GetUnitScale(); |
1395 | Float_t tscale=ry->GetUnitScale(); |
1396 | if ((tscale/scale > 1.1) || (scale/tscale > 1.1)) r2=r2*(tscale/scale); |
1397 | Ali3Vector r=r1-r2; |
1398 | dist=fabs(r.Dot(n)); |
1399 | fDresult=r.GetResultError(); |
1400 | } |
1401 | else // Parallel tracks |
1402 | { |
1403 | dist=t->GetDistance(rx); |
1404 | fDresult=t->GetResultError(); |
1405 | } |
1406 | return dist; |
1407 | } |
1408 | /////////////////////////////////////////////////////////////////////////// |
261c0caf |
1409 | TObject* AliTrack::Clone(const char* name) const |
5f25234b |
1410 | { |
1411 | // Make a deep copy of the current object and provide the pointer to the copy. |
1412 | // This memberfunction enables automatic creation of new objects of the |
1413 | // correct type depending on the object type, a feature which may be very useful |
1414 | // for containers when adding objects in case the container owns the objects. |
1415 | // This feature allows e.g. AliJet to store either AliTrack objects or |
1416 | // objects derived from AliTrack via the AddTrack memberfunction, provided |
1417 | // these derived classes also have a proper Clone memberfunction. |
1418 | |
1419 | AliTrack* trk=new AliTrack(*this); |
1420 | if (name) |
1421 | { |
1422 | if (strlen(name)) trk->SetName(name); |
1423 | } |
1424 | return trk; |
1425 | } |
1426 | /////////////////////////////////////////////////////////////////////////// |