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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 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; | |
113 | fImpactXY=0; | |
114 | fImpactXZ=0; | |
115 | fImpactYZ=0; | |
116 | fClosest=0; | |
1fbffa23 | 117 | fParent=0; |
d88f97cc | 118 | } |
119 | /////////////////////////////////////////////////////////////////////////// | |
120 | AliTrack::~AliTrack() | |
121 | { | |
5f25234b | 122 | // Destructor to delete memory allocated for decay tracks array. |
123 | // This destructor automatically cleares the pointer of this AliTrack | |
124 | // from all the link slots of the related AliSignal objects. | |
125 | ||
126 | Int_t nsig=GetNsignals(); | |
127 | for (Int_t i=1; i<=nsig; i++) | |
128 | { | |
129 | AliSignal* s=GetSignal(i); | |
130 | if (s) s->ResetLink(this); | |
131 | } | |
132 | ||
d88f97cc | 133 | if (fDecays) |
134 | { | |
d88f97cc | 135 | delete fDecays; |
136 | fDecays=0; | |
137 | } | |
959fbac5 | 138 | if (fSignals) |
139 | { | |
140 | fSignals->Clear(); | |
141 | delete fSignals; | |
142 | fSignals=0; | |
143 | } | |
5f25234b | 144 | if (fHypotheses) |
c72198f1 | 145 | { |
5f25234b | 146 | delete fHypotheses; |
147 | fHypotheses=0; | |
c72198f1 | 148 | } |
149 | if (fBegin) | |
150 | { | |
151 | delete fBegin; | |
152 | fBegin=0; | |
153 | } | |
154 | if (fEnd) | |
155 | { | |
156 | delete fEnd; | |
157 | fEnd=0; | |
158 | } | |
159 | if (fImpactXY) | |
160 | { | |
161 | delete fImpactXY; | |
162 | fImpactXY=0; | |
163 | } | |
164 | if (fImpactXZ) | |
165 | { | |
166 | delete fImpactXZ; | |
167 | fImpactXZ=0; | |
168 | } | |
169 | if (fImpactYZ) | |
170 | { | |
171 | delete fImpactYZ; | |
172 | fImpactYZ=0; | |
173 | } | |
174 | if (fClosest) | |
175 | { | |
176 | delete fClosest; | |
177 | fClosest=0; | |
178 | } | |
d88f97cc | 179 | } |
180 | /////////////////////////////////////////////////////////////////////////// | |
5f25234b | 181 | AliTrack::AliTrack(AliTrack& t) : TNamed(t),Ali4Vector(t) |
6516b62d | 182 | { |
183 | // Copy constructor | |
184 | Init(); | |
185 | ||
c72198f1 | 186 | fQ=t.fQ; |
5f25234b | 187 | fProb=t.fProb; |
c72198f1 | 188 | if (t.fBegin) fBegin=new AliPositionObj(*(t.fBegin)); |
189 | if (t.fEnd) fEnd=new AliPositionObj(*(t.fEnd)); | |
190 | if (t.fImpactXY) fImpactXY=new AliPositionObj(*(t.fImpactXY)); | |
191 | if (t.fImpactXZ) fImpactXZ=new AliPositionObj(*(t.fImpactXZ)); | |
192 | if (t.fImpactYZ) fImpactYZ=new AliPositionObj(*(t.fImpactYZ)); | |
193 | if (t.fClosest) fClosest=new AliPositionObj(*(t.fClosest)); | |
194 | fUserId=t.fUserId; | |
195 | fChi2=t.fChi2; | |
196 | fNdf=t.fNdf; | |
197 | fCode=t.fCode; | |
1fbffa23 | 198 | fParent=t.fParent; |
c72198f1 | 199 | |
5f25234b | 200 | Int_t ndec=t.GetNdecay(); |
201 | if (ndec) | |
6516b62d | 202 | { |
5f25234b | 203 | fDecays=new TObjArray(ndec); |
6516b62d | 204 | fDecays->SetOwner(); |
5f25234b | 205 | for (Int_t it=1; it<=ndec; it++) |
6516b62d | 206 | { |
c72198f1 | 207 | AliTrack* tx=t.GetDecayTrack(it); |
6516b62d | 208 | fDecays->Add(new AliTrack(*tx)); |
209 | } | |
210 | } | |
211 | ||
5f25234b | 212 | Int_t nsig=t.GetNsignals(); |
213 | if (nsig) | |
6516b62d | 214 | { |
5f25234b | 215 | fSignals=new TObjArray(nsig); |
216 | for (Int_t is=1; is<=nsig; is++) | |
6516b62d | 217 | { |
c72198f1 | 218 | AliSignal* sx=t.GetSignal(is); |
6516b62d | 219 | fSignals->Add(sx); |
220 | } | |
221 | } | |
5f25234b | 222 | |
223 | Int_t nhyp=t.GetNhypotheses(); | |
224 | if (nhyp) | |
225 | { | |
226 | fHypotheses=new TObjArray(nhyp); | |
227 | fHypotheses->SetOwner(); | |
228 | for (Int_t ih=1; ih<=nhyp; ih++) | |
229 | { | |
230 | AliTrack* tx=t.GetTrackHypothesis(ih); | |
231 | fHypotheses->Add(new AliTrack(*tx)); | |
232 | } | |
233 | } | |
6516b62d | 234 | } |
235 | /////////////////////////////////////////////////////////////////////////// | |
d88f97cc | 236 | void AliTrack::Reset() |
237 | { | |
35044448 | 238 | // Reset all variables to 0 and delete all auto-generated decay tracks. |
d88f97cc | 239 | fQ=0; |
2693cb4e | 240 | fChi2=0; |
241 | fNdf=0; | |
43bfa5be | 242 | fUserId=0; |
fdbea0ce | 243 | fCode=0; |
5f25234b | 244 | fProb=0; |
d88f97cc | 245 | Double_t a[4]={0,0,0,0}; |
246 | SetVector(a,"sph"); | |
1fbffa23 | 247 | fParent=0; |
d88f97cc | 248 | if (fDecays) |
249 | { | |
d88f97cc | 250 | delete fDecays; |
251 | fDecays=0; | |
252 | } | |
959fbac5 | 253 | if (fSignals) |
254 | { | |
255 | fSignals->Clear(); | |
256 | delete fSignals; | |
257 | fSignals=0; | |
258 | } | |
5f25234b | 259 | if (fHypotheses) |
f531a546 | 260 | { |
5f25234b | 261 | delete fHypotheses; |
262 | fHypotheses=0; | |
f531a546 | 263 | } |
c72198f1 | 264 | if (fBegin) |
265 | { | |
266 | delete fBegin; | |
267 | fBegin=0; | |
268 | } | |
269 | if (fEnd) | |
270 | { | |
271 | delete fEnd; | |
272 | fEnd=0; | |
273 | } | |
274 | if (fImpactXY) | |
275 | { | |
276 | delete fImpactXY; | |
277 | fImpactXY=0; | |
278 | } | |
279 | if (fImpactXZ) | |
280 | { | |
281 | delete fImpactXZ; | |
282 | fImpactXZ=0; | |
283 | } | |
284 | if (fImpactYZ) | |
285 | { | |
286 | delete fImpactYZ; | |
287 | fImpactYZ=0; | |
288 | } | |
289 | if (fClosest) | |
290 | { | |
291 | delete fClosest; | |
292 | fClosest=0; | |
293 | } | |
d88f97cc | 294 | } |
295 | /////////////////////////////////////////////////////////////////////////// | |
296 | void AliTrack::Set3Momentum(Ali3Vector& p) | |
297 | { | |
298 | // Set the track parameters according to the 3-momentum p | |
959fbac5 | 299 | Set3Vector(p); |
d88f97cc | 300 | } |
301 | /////////////////////////////////////////////////////////////////////////// | |
302 | void AliTrack::Set4Momentum(Ali4Vector& p) | |
303 | { | |
304 | // Set the track parameters according to the 4-momentum p | |
305 | Double_t E=p.GetScalar(); | |
959fbac5 | 306 | Double_t dE=p.GetResultError(); |
d88f97cc | 307 | Ali3Vector pv=p.Get3Vector(); |
308 | SetVector(E,pv); | |
959fbac5 | 309 | SetScalarError(dE); |
d88f97cc | 310 | } |
311 | /////////////////////////////////////////////////////////////////////////// | |
959fbac5 | 312 | void AliTrack::SetMass(Double_t m,Double_t dm) |
d88f97cc | 313 | { |
314 | // Set the particle mass | |
959fbac5 | 315 | // The default value for the error dm is 0. |
316 | Double_t inv=pow(m,2); | |
317 | Double_t dinv=fabs(2.*m*dm); | |
318 | SetInvariant(inv,dinv); | |
d88f97cc | 319 | } |
320 | /////////////////////////////////////////////////////////////////////////// | |
321 | void AliTrack::SetCharge(Float_t q) | |
322 | { | |
323 | // Set the particle charge | |
324 | fQ=q; | |
325 | } | |
326 | /////////////////////////////////////////////////////////////////////////// | |
84bb7c66 | 327 | void AliTrack::Data(TString f) |
d88f97cc | 328 | { |
329 | // Provide track information within the coordinate frame f | |
959fbac5 | 330 | Double_t m=GetMass(); |
331 | Double_t dm=GetResultError(); | |
5f25234b | 332 | const char* name=GetName(); |
333 | const char* title=GetTitle(); | |
334 | ||
335 | cout << " *" << ClassName() << "::Data*"; | |
336 | if (strlen(name)) cout << " Name : " << GetName(); | |
337 | if (strlen(title)) cout << " Title : " << GetTitle(); | |
338 | cout << endl; | |
339 | cout << " Id : " << fUserId << " Code : " << fCode | |
340 | << " m : " << m << " dm : " << dm << " Charge : " << fQ | |
341 | << " p : " << GetMomentum() << endl; | |
342 | cout << " Nhypotheses : " << GetNhypotheses() << " Ndecay-tracks : " << GetNdecay() | |
343 | << " Nsignals : " << GetNsignals() << endl; | |
84bb7c66 | 344 | Ali4Vector::Data(f); |
d88f97cc | 345 | } |
346 | /////////////////////////////////////////////////////////////////////////// | |
347 | void AliTrack::List(TString f) | |
348 | { | |
349 | // Provide current track and decay level 1 information within coordinate frame f | |
350 | ||
84bb7c66 | 351 | Data(f); // Information of the current track |
d88f97cc | 352 | |
353 | // Decay products of this track | |
354 | AliTrack* td; | |
5f25234b | 355 | for (Int_t id=1; id<=GetNdecay(); id++) |
d88f97cc | 356 | { |
357 | td=GetDecayTrack(id); | |
358 | if (td) | |
359 | { | |
360 | cout << " ---Level 1 sec. track no. " << id << endl; | |
84bb7c66 | 361 | td->Data(f); |
d88f97cc | 362 | } |
363 | else | |
364 | { | |
5f25234b | 365 | cout << " *AliTrack::List* Error : Empty decay track slot." << endl; |
d88f97cc | 366 | } |
367 | } | |
368 | } | |
369 | /////////////////////////////////////////////////////////////////////////// | |
370 | void AliTrack::ListAll(TString f) | |
371 | { | |
372 | // Provide complete track and decay information within the coordinate frame f | |
373 | ||
84bb7c66 | 374 | Data(f); // Information of the current track |
c72198f1 | 375 | if (fBegin) { cout << " Begin-point :"; fBegin->Data(f); } |
376 | if (fEnd) { cout << " End-point :"; fEnd->Data(f); } | |
5f25234b | 377 | |
378 | Int_t nhyp=GetNhypotheses(); | |
379 | if (nhyp) | |
380 | { | |
381 | cout << " List of the " << nhyp << " track hypotheses : " << endl; | |
382 | for (Int_t ih=1; ih<=nhyp; ih++) | |
383 | { | |
384 | AliTrack* tx=GetTrackHypothesis(ih); | |
385 | if (tx) tx->Data(f); | |
386 | } | |
387 | } | |
388 | ||
389 | Int_t nsig=GetNsignals(); | |
390 | if (nsig) | |
959fbac5 | 391 | { |
5f25234b | 392 | cout << " List of the " << nsig << " related signals : " << endl; |
393 | for (Int_t is=1; is<=nsig; is++) | |
394 | { | |
395 | AliSignal* sx=GetSignal(is); | |
396 | if (sx) sx->Data(f); | |
397 | } | |
959fbac5 | 398 | } |
d88f97cc | 399 | |
400 | AliTrack* t=this; | |
1c01b4f8 | 401 | Dumps(t,1,f); // Information of all decay products |
d88f97cc | 402 | } |
403 | ////////////////////////////////////////////////////////////////////////// | |
1c01b4f8 | 404 | void AliTrack::Dumps(AliTrack* t,Int_t n,TString f) |
d88f97cc | 405 | { |
406 | // Recursively provide the info of all decay levels of this track | |
407 | AliTrack* td; | |
408 | for (Int_t id=1; id<=t->GetNdecay(); id++) | |
409 | { | |
410 | td=t->GetDecayTrack(id); | |
411 | if (td) | |
412 | { | |
413 | cout << " ---Level " << n << " sec. track no. " << id << endl; | |
84bb7c66 | 414 | td->Data(f); |
5f25234b | 415 | |
416 | Int_t nhyp=td->GetNhypotheses(); | |
417 | if (nhyp) | |
418 | { | |
419 | cout << " List of the " << nhyp << " track hypotheses : " << endl; | |
420 | for (Int_t ih=1; ih<=nhyp; ih++) | |
421 | { | |
422 | AliTrack* tx=td->GetTrackHypothesis(ih); | |
423 | if (tx) tx->Data(f); | |
424 | } | |
425 | } | |
426 | ||
427 | Int_t nsig=td->GetNsignals(); | |
428 | if (nsig) | |
959fbac5 | 429 | { |
5f25234b | 430 | cout << " List of the " << nsig << " related signals : " << endl; |
431 | for (Int_t is=1; is<=nsig; is++) | |
432 | { | |
433 | AliSignal* sx=td->GetSignal(is); | |
434 | if (sx) sx->Data(f); | |
435 | } | |
959fbac5 | 436 | } |
d88f97cc | 437 | |
438 | // Go for next decay level of this decay track recursively | |
1c01b4f8 | 439 | Dumps(td,n+1,f); |
d88f97cc | 440 | } |
441 | else | |
442 | { | |
5f25234b | 443 | cout << " *AliTrack::Dumps* Error : Empty decay track slot." << endl; |
d88f97cc | 444 | } |
445 | } | |
446 | } | |
447 | ////////////////////////////////////////////////////////////////////////// | |
448 | Double_t AliTrack::GetMomentum() | |
449 | { | |
959fbac5 | 450 | // Provide the value of the track 3-momentum. |
451 | // The error can be obtained by invoking GetResultError() after | |
452 | // invokation of GetMomentum(). | |
959fbac5 | 453 | Double_t norm=fV.GetNorm(); |
d071d629 | 454 | fDresult=fV.GetResultError(); |
959fbac5 | 455 | return norm; |
d88f97cc | 456 | } |
457 | /////////////////////////////////////////////////////////////////////////// | |
458 | Ali3Vector AliTrack::Get3Momentum() | |
459 | { | |
460 | // Provide the track 3-momentum | |
461 | return (Ali3Vector)Get3Vector(); | |
462 | } | |
463 | /////////////////////////////////////////////////////////////////////////// | |
464 | Double_t AliTrack::GetMass() | |
465 | { | |
959fbac5 | 466 | // Provide the particle mass. |
467 | // The error can be obtained by invoking GetResultError() after | |
468 | // invokation of GetMass(). | |
469 | Double_t inv=GetInvariant(); | |
470 | Double_t dinv=GetResultError(); | |
471 | Double_t dm=0; | |
472 | if (inv >= 0) | |
473 | { | |
474 | Double_t m=sqrt(inv); | |
475 | if (m) dm=dinv/(2.*m); | |
476 | fDresult=dm; | |
477 | return m; | |
478 | } | |
479 | else | |
480 | { | |
481 | cout << "*AliTrack::GetMass* Unphysical situation m**2 = " << inv << endl; | |
482 | cout << " Value 0 will be returned." << endl; | |
483 | fDresult=dm; | |
484 | return 0; | |
485 | } | |
d88f97cc | 486 | } |
487 | /////////////////////////////////////////////////////////////////////////// | |
488 | Float_t AliTrack::GetCharge() | |
489 | { | |
490 | // Provide the particle charge | |
491 | return fQ; | |
492 | } | |
493 | /////////////////////////////////////////////////////////////////////////// | |
494 | Double_t AliTrack::GetEnergy() | |
495 | { | |
959fbac5 | 496 | // Provide the particle's energy. |
497 | // The error can be obtained by invoking GetResultError() after | |
498 | // invokation of GetEnergy(). | |
499 | Double_t E=GetScalar(); | |
500 | if (E>0) | |
501 | { | |
502 | return E; | |
503 | } | |
504 | else | |
505 | { | |
506 | cout << "*AliTrack::GetEnergy* Unphysical situation E = " << E << endl; | |
507 | cout << " Value 0 will be returned." << endl; | |
508 | return 0; | |
509 | } | |
d88f97cc | 510 | } |
511 | /////////////////////////////////////////////////////////////////////////// | |
512 | void AliTrack::Decay(Double_t m1,Double_t m2,Double_t thcms,Double_t phicms) | |
513 | { | |
514 | // Perform 2-body decay of current track | |
515 | // m1 : mass of decay product 1 | |
516 | // m2 : mass of decay product 2 | |
517 | // thcms : cms theta decay angle (in rad.) of m1 | |
518 | // phicms : cms phi decay angle (in rad.) of m1 | |
519 | ||
959fbac5 | 520 | Double_t M=GetMass(); |
d88f97cc | 521 | |
522 | // Compute the 4-momenta of the decay products in the cms | |
523 | // Note : p2=p1=pnorm for a 2-body decay | |
959fbac5 | 524 | Double_t e1=0; |
525 | if (M) e1=((M*M)+(m1*m1)-(m2*m2))/(2.*M); | |
526 | Double_t e2=0; | |
527 | if (M) e2=((M*M)+(m2*m2)-(m1*m1))/(2.*M); | |
d88f97cc | 528 | Double_t pnorm=(e1*e1)-(m1*m1); |
529 | if (pnorm>0.) | |
530 | { | |
531 | pnorm=sqrt(pnorm); | |
532 | } | |
533 | else | |
534 | { | |
535 | pnorm=0; | |
536 | } | |
537 | ||
538 | Double_t a[3]; | |
539 | a[0]=pnorm; | |
540 | a[1]=thcms; | |
541 | a[2]=phicms; | |
542 | Ali3Vector p; | |
543 | p.SetVector(a,"sph"); | |
544 | ||
545 | Ali4Vector pprim1; | |
546 | pprim1.SetVector(e1,p); | |
959fbac5 | 547 | pprim1.SetInvariant(m1*m1); |
d88f97cc | 548 | |
549 | Ali4Vector pprim2; | |
550 | p*=-1; | |
551 | pprim2.SetVector(e2,p); | |
959fbac5 | 552 | pprim2.SetInvariant(m2*m2); |
d88f97cc | 553 | |
554 | // Determine boost parameters from the parent particle | |
959fbac5 | 555 | Double_t E=GetEnergy(); |
d88f97cc | 556 | p=Get3Vector(); |
557 | Ali4Vector pmu; | |
558 | pmu.SetVector(E,p); | |
559 | ||
560 | AliBoost q; | |
561 | q.Set4Momentum(pmu); | |
562 | ||
563 | Ali4Vector p1=q.Inverse(pprim1); // Boost decay product 1 | |
564 | Ali4Vector p2=q.Inverse(pprim2); // Boost decay product 2 | |
565 | ||
566 | // Enter the boosted data into the decay tracks array | |
567 | if (fDecays) | |
568 | { | |
d88f97cc | 569 | delete fDecays; |
6516b62d | 570 | fDecays=0; |
d88f97cc | 571 | } |
5f25234b | 572 | fDecays=new TObjArray(2); |
6516b62d | 573 | fDecays->SetOwner(); |
d88f97cc | 574 | |
575 | fDecays->Add(new AliTrack); | |
576 | ((AliTrack*)fDecays->At(0))->Set4Momentum(p1); | |
959fbac5 | 577 | ((AliTrack*)fDecays->At(0))->SetMass(m1); |
d88f97cc | 578 | fDecays->Add(new AliTrack); |
579 | ((AliTrack*)fDecays->At(1))->Set4Momentum(p2); | |
d88f97cc | 580 | ((AliTrack*)fDecays->At(1))->SetMass(m2); |
581 | } | |
582 | /////////////////////////////////////////////////////////////////////////// | |
583 | Int_t AliTrack::GetNdecay() | |
584 | { | |
585 | // Provide the number of decay produced tracks | |
5f25234b | 586 | Int_t ndec=0; |
587 | if (fDecays) ndec=fDecays->GetEntries(); | |
588 | return ndec; | |
d88f97cc | 589 | } |
590 | /////////////////////////////////////////////////////////////////////////// | |
591 | AliTrack* AliTrack::GetDecayTrack(Int_t j) | |
592 | { | |
593 | // Provide decay produced track number j | |
594 | // Note : j=1 denotes the first decay track | |
6516b62d | 595 | if (!fDecays) |
d88f97cc | 596 | { |
6516b62d | 597 | cout << " *AliTrack::GetDecayTrack* No tracks present." << endl; |
598 | return 0; | |
d88f97cc | 599 | } |
600 | else | |
601 | { | |
5f25234b | 602 | if ((j >= 1) && (j <= GetNdecay())) |
6516b62d | 603 | { |
604 | return (AliTrack*)fDecays->At(j-1); | |
605 | } | |
606 | else | |
607 | { | |
608 | cout << " *AliTrack* decay track number : " << j << " out of range." | |
5f25234b | 609 | << " Ndec = " << GetNdecay() << endl; |
6516b62d | 610 | return 0; |
611 | } | |
d88f97cc | 612 | } |
613 | } | |
614 | /////////////////////////////////////////////////////////////////////////// | |
5f25234b | 615 | void AliTrack::RemoveDecays() |
616 | { | |
617 | // Remove all decay tracks from this track. | |
618 | if (fDecays) | |
619 | { | |
620 | delete fDecays; | |
621 | fDecays=0; | |
622 | } | |
623 | } | |
624 | /////////////////////////////////////////////////////////////////////////// | |
959fbac5 | 625 | void AliTrack::AddSignal(AliSignal& s) |
626 | { | |
627 | // Relate an AliSignal object to this track. | |
5f25234b | 628 | if (!fSignals) fSignals=new TObjArray(1); |
629 | ||
630 | // Check if this signal is already stored for this track | |
631 | Int_t nsig=GetNsignals(); | |
632 | for (Int_t i=0; i<nsig; i++) | |
633 | { | |
634 | if (&s==fSignals->At(i)) return; | |
635 | } | |
636 | ||
959fbac5 | 637 | fSignals->Add(&s); |
638 | } | |
639 | /////////////////////////////////////////////////////////////////////////// | |
640 | void AliTrack::RemoveSignal(AliSignal& s) | |
641 | { | |
5f25234b | 642 | // Remove related AliSignal object from this track. |
959fbac5 | 643 | if (fSignals) |
644 | { | |
645 | AliSignal* test=(AliSignal*)fSignals->Remove(&s); | |
5f25234b | 646 | if (test) fSignals->Compress(); |
647 | } | |
648 | } | |
649 | /////////////////////////////////////////////////////////////////////////// | |
650 | void AliTrack::RemoveSignals() | |
651 | { | |
652 | // Remove all related AliSignal objects from this track. | |
653 | if (fSignals) | |
654 | { | |
655 | fSignals->Clear(); | |
656 | delete fSignals; | |
657 | fSignals=0; | |
959fbac5 | 658 | } |
659 | } | |
660 | /////////////////////////////////////////////////////////////////////////// | |
661 | Int_t AliTrack::GetNsignals() | |
662 | { | |
663 | // Provide the number of related AliSignals. | |
5f25234b | 664 | Int_t nsig=0; |
665 | if (fSignals) nsig=fSignals->GetEntries(); | |
666 | return nsig; | |
959fbac5 | 667 | } |
668 | /////////////////////////////////////////////////////////////////////////// | |
669 | AliSignal* AliTrack::GetSignal(Int_t j) | |
670 | { | |
671 | // Provide the related AliSignal number j. | |
672 | // Note : j=1 denotes the first signal. | |
6516b62d | 673 | if (!fSignals) |
959fbac5 | 674 | { |
6516b62d | 675 | cout << " *AliTrack::GetSignal* No signals present." << endl; |
676 | return 0; | |
959fbac5 | 677 | } |
678 | else | |
679 | { | |
5f25234b | 680 | if ((j >= 1) && (j <= GetNsignals())) |
6516b62d | 681 | { |
682 | return (AliSignal*)fSignals->At(j-1); | |
683 | } | |
684 | else | |
685 | { | |
686 | cout << " *AliTrack* signal number : " << j << " out of range." | |
5f25234b | 687 | << " Nsig = " << GetNsignals() << endl; |
6516b62d | 688 | return 0; |
689 | } | |
959fbac5 | 690 | } |
691 | } | |
692 | /////////////////////////////////////////////////////////////////////////// | |
5f25234b | 693 | void AliTrack::AddTrackHypothesis(AliTrack& t) |
959fbac5 | 694 | { |
5f25234b | 695 | // Relate a track hypothesis to this track. |
696 | // Note : a private copy of the input track will be made via the Clone() | |
697 | // facility. | |
698 | if (!fHypotheses) | |
c72198f1 | 699 | { |
5f25234b | 700 | fHypotheses=new TObjArray(1); |
701 | fHypotheses->SetOwner(); | |
c72198f1 | 702 | } |
5f25234b | 703 | fHypotheses->Add(t.Clone()); |
959fbac5 | 704 | } |
705 | /////////////////////////////////////////////////////////////////////////// | |
5f25234b | 706 | void AliTrack::AddTrackHypothesis(Double_t prob,Double_t m,Double_t dm) |
959fbac5 | 707 | { |
5f25234b | 708 | // Add a track hypothesis by explicitly setting the mass and probability. |
709 | // This will affect e.g. the hypothesis track's energy, since the momentum | |
710 | // and all other attributes will be copied from the current track. | |
711 | // | |
712 | // Input arguments : | |
713 | // ----------------- | |
714 | // prob=probalility m=mass value dm=error on the mass value. | |
715 | // The default value for the mass error dm is 0. | |
716 | ||
717 | AliTrack t(*this); | |
718 | t.RemoveDecays(); | |
719 | t.RemoveTrackHypotheses(); | |
720 | t.RemoveSignals(); | |
721 | t.SetTitle("Mass hypothesis"); | |
722 | t.SetMass(m,dm); | |
723 | t.SetProb(prob); | |
724 | AddTrackHypothesis(t); | |
959fbac5 | 725 | } |
726 | /////////////////////////////////////////////////////////////////////////// | |
5f25234b | 727 | void AliTrack::RemoveTrackHypothesis(AliTrack& t) |
959fbac5 | 728 | { |
5f25234b | 729 | // Remove the specified track hypothesis from this track. |
730 | if (fHypotheses) | |
c72198f1 | 731 | { |
5f25234b | 732 | AliTrack* test=(AliTrack*)fHypotheses->Remove(&t); |
733 | if (test) fHypotheses->Compress(); | |
c72198f1 | 734 | } |
959fbac5 | 735 | } |
736 | /////////////////////////////////////////////////////////////////////////// | |
5f25234b | 737 | void AliTrack::RemoveTrackHypotheses() |
959fbac5 | 738 | { |
5f25234b | 739 | // Remove all track hypotheses from this track. |
740 | if (fHypotheses) | |
741 | { | |
742 | delete fHypotheses; | |
743 | fHypotheses=0; | |
744 | } | |
f531a546 | 745 | } |
746 | /////////////////////////////////////////////////////////////////////////// | |
5f25234b | 747 | Int_t AliTrack::GetNhypotheses() |
f531a546 | 748 | { |
5f25234b | 749 | // Provide the number of track hypotheses. |
750 | Int_t nhyp=0; | |
751 | if (fHypotheses) nhyp=fHypotheses->GetEntries(); | |
752 | return nhyp; | |
f531a546 | 753 | } |
754 | /////////////////////////////////////////////////////////////////////////// | |
5f25234b | 755 | AliTrack* AliTrack::GetTrackHypothesis(Int_t j) |
f531a546 | 756 | { |
5f25234b | 757 | // Provide the j-th track hypothesis. |
758 | // Note : j=1 denotes the first hypothesis. | |
f531a546 | 759 | // Default : j=0 ==> Hypothesis with highest probability. |
f531a546 | 760 | |
5f25234b | 761 | if (!fHypotheses) return 0; |
762 | ||
763 | Int_t nhyp=GetNhypotheses(); | |
f531a546 | 764 | |
765 | // Check validity of index j | |
5f25234b | 766 | if (j<0 || j>nhyp) |
f531a546 | 767 | { |
5f25234b | 768 | cout << " *AliTrack* hypothesis number : " << j << " out of range." |
769 | << " Nhyp = " << nhyp << endl; | |
770 | return 0; | |
771 | } | |
f531a546 | 772 | |
5f25234b | 773 | AliTrack* t=0; |
774 | ||
775 | if (j==0) // Provide track hypothesis with highest probability | |
f531a546 | 776 | { |
5f25234b | 777 | Float_t prob=0; |
778 | t=(AliTrack*)fHypotheses->At(0); | |
779 | if (t) prob=t->GetProb(); | |
780 | Float_t probx=0; | |
781 | for (Int_t ih=1; ih<nhyp; ih++) | |
f531a546 | 782 | { |
5f25234b | 783 | AliTrack* tx=(AliTrack*)fHypotheses->At(ih); |
784 | if (tx) | |
f531a546 | 785 | { |
5f25234b | 786 | probx=tx->GetProb(); |
787 | if (probx > prob) t=tx; | |
f531a546 | 788 | } |
789 | } | |
5f25234b | 790 | return t; |
791 | } | |
792 | else // Provide requested j-th track hypothesis | |
793 | { | |
794 | return (AliTrack*)fHypotheses->At(j-1); | |
f531a546 | 795 | } |
f531a546 | 796 | } |
797 | /////////////////////////////////////////////////////////////////////////// | |
5f25234b | 798 | void AliTrack::SetBeginPoint(AliPosition& p) |
f531a546 | 799 | { |
5f25234b | 800 | // Store the position of the track begin-point. |
801 | if (!fBegin) | |
f531a546 | 802 | { |
5f25234b | 803 | fBegin=new AliPositionObj(p); |
f531a546 | 804 | } |
5f25234b | 805 | else |
f531a546 | 806 | { |
5f25234b | 807 | fBegin->Load(p); |
f531a546 | 808 | } |
f531a546 | 809 | } |
810 | /////////////////////////////////////////////////////////////////////////// | |
5f25234b | 811 | AliPosition* AliTrack::GetBeginPoint() |
f531a546 | 812 | { |
5f25234b | 813 | // Provide the position of the track begin-point. |
814 | return fBegin; | |
815 | } | |
816 | /////////////////////////////////////////////////////////////////////////// | |
817 | void AliTrack::SetEndPoint(AliPosition& p) | |
818 | { | |
819 | // Store the position of the track end-point. | |
820 | if (!fEnd) | |
f531a546 | 821 | { |
5f25234b | 822 | fEnd=new AliPositionObj(p); |
f531a546 | 823 | } |
824 | else | |
825 | { | |
5f25234b | 826 | fEnd->Load(p); |
f531a546 | 827 | } |
828 | } | |
829 | /////////////////////////////////////////////////////////////////////////// | |
5f25234b | 830 | AliPosition* AliTrack::GetEndPoint() |
831 | { | |
832 | // Provide the position of the track end-point. | |
833 | return fEnd; | |
834 | } | |
835 | /////////////////////////////////////////////////////////////////////////// | |
836 | void AliTrack::SetMass() | |
f531a546 | 837 | { |
5f25234b | 838 | // Set the mass and error to the value of the hypothesis with highest prob. |
f531a546 | 839 | |
5f25234b | 840 | Double_t m=0,dm=0; |
841 | ||
842 | // Select mass hypothesis with highest probability | |
843 | AliTrack* t=GetTrackHypothesis(0); | |
844 | if (t) | |
f531a546 | 845 | { |
5f25234b | 846 | m=t->GetMass(); |
847 | dm=t->GetResultError(); | |
848 | SetMass(m,dm); | |
f531a546 | 849 | } |
850 | else | |
851 | { | |
5f25234b | 852 | cout << " *AliTrack::SetMass()* No hypothesis present => No action." << endl; |
f531a546 | 853 | } |
854 | } | |
855 | /////////////////////////////////////////////////////////////////////////// | |
d071d629 | 856 | Double_t AliTrack::GetPt() |
857 | { | |
858 | // Provide trans. momentum value w.r.t. z-axis. | |
859 | // The error on the value can be obtained by GetResultError() | |
860 | // after invokation of GetPt(). | |
861 | Ali3Vector v; | |
862 | v=GetVecTrans(); | |
863 | Double_t norm=v.GetNorm(); | |
864 | fDresult=v.GetResultError(); | |
865 | ||
866 | return norm; | |
867 | } | |
868 | /////////////////////////////////////////////////////////////////////////// | |
869 | Double_t AliTrack::GetPl() | |
870 | { | |
871 | // Provide long. momentum value w.r.t. z-axis. | |
8adaf597 | 872 | // Note : the returned value can also be negative. |
d071d629 | 873 | // The error on the value can be obtained by GetResultError() |
874 | // after invokation of GetPl(). | |
875 | Ali3Vector v; | |
876 | v=GetVecLong(); | |
8adaf597 | 877 | |
878 | Double_t pl=v.GetNorm(); | |
d071d629 | 879 | fDresult=v.GetResultError(); |
880 | ||
8adaf597 | 881 | Double_t a[3]; |
882 | v.GetVector(a,"sph"); | |
883 | if (cos(a[1])<0) pl=-pl; | |
884 | ||
885 | return pl; | |
d071d629 | 886 | } |
887 | /////////////////////////////////////////////////////////////////////////// | |
888 | Double_t AliTrack::GetEt() | |
889 | { | |
890 | // Provide trans. energy value w.r.t. z-axis. | |
891 | // The error on the value can be obtained by GetResultError() | |
892 | // after invokation of GetEt(). | |
893 | Double_t et=GetScaTrans(); | |
894 | ||
895 | return et; | |
896 | } | |
897 | /////////////////////////////////////////////////////////////////////////// | |
898 | Double_t AliTrack::GetEl() | |
899 | { | |
900 | // Provide long. energy value w.r.t. z-axis. | |
8adaf597 | 901 | // Note : the returned value can also be negative. |
d071d629 | 902 | // The error on the value can be obtained by GetResultError() |
903 | // after invokation of GetEl(). | |
904 | Double_t el=GetScaLong(); | |
905 | ||
906 | return el; | |
907 | } | |
908 | /////////////////////////////////////////////////////////////////////////// | |
909 | Double_t AliTrack::GetMt() | |
910 | { | |
911 | // Provide transverse mass value w.r.t. z-axis. | |
912 | // The error on the value can be obtained by GetResultError() | |
913 | // after invokation of GetMt(). | |
914 | Double_t pt=GetPt(); | |
915 | Double_t dpt=GetResultError(); | |
916 | Double_t m=GetMass(); | |
917 | Double_t dm=GetResultError(); | |
918 | ||
919 | Double_t mt=sqrt(pt*pt+m*m); | |
920 | Double_t dmt2=0; | |
921 | if (mt) dmt2=(pow((pt*dpt),2)+pow((m*dm),2))/(mt*mt); | |
922 | ||
923 | fDresult=sqrt(dmt2); | |
924 | return mt; | |
925 | } | |
926 | /////////////////////////////////////////////////////////////////////////// | |
8adaf597 | 927 | Double_t AliTrack::GetRapidity() |
928 | { | |
929 | // Provide rapidity value w.r.t. z-axis. | |
930 | // The error on the value can be obtained by GetResultError() | |
931 | // after invokation of GetRapidity(). | |
932 | // Note : Also GetPseudoRapidity() is available since this class is | |
933 | // derived from Ali4Vector. | |
934 | Double_t e=GetEnergy(); | |
935 | Double_t de=GetResultError(); | |
936 | Double_t pl=GetPl(); | |
937 | Double_t dpl=GetResultError(); | |
938 | Double_t sum=e+pl; | |
939 | Double_t dif=e-pl; | |
940 | ||
941 | Double_t y=9999,dy2=0; | |
942 | if (sum && dif) y=0.5*log(sum/dif); | |
943 | ||
944 | if (sum*dif) dy2=(1./(sum*dif))*(pow((pl*de),2)+pow((e*dpl),2)); | |
945 | ||
946 | fDresult=sqrt(dy2); | |
947 | return y; | |
948 | } | |
949 | /////////////////////////////////////////////////////////////////////////// | |
c72198f1 | 950 | void AliTrack::SetImpactPoint(AliPosition& p,TString q) |
43bfa5be | 951 | { |
952 | // Store the position of the impact-point in the plane "q=0". | |
953 | // Here q denotes one of the axes X, Y or Z. | |
954 | // Note : The character to denote the axis may be entered in lower or | |
955 | // in uppercase. | |
956 | Int_t axis=0; | |
957 | if (q=="x" || q=="X") axis=1; | |
958 | if (q=="y" || q=="Y") axis=2; | |
959 | if (q=="z" || q=="Z") axis=3; | |
960 | ||
961 | switch (axis) | |
962 | { | |
963 | case 1: // Impact-point in the plane X=0 | |
c72198f1 | 964 | if (!fImpactYZ) |
965 | { | |
966 | fImpactYZ=new AliPositionObj(p); | |
967 | } | |
968 | else | |
969 | { | |
970 | fImpactYZ->Load(p); | |
971 | } | |
43bfa5be | 972 | break; |
973 | ||
974 | case 2: // Impact-point in the plane Y=0 | |
c72198f1 | 975 | if (!fImpactXZ) |
976 | { | |
977 | fImpactXZ=new AliPositionObj(p); | |
978 | } | |
979 | else | |
980 | { | |
981 | fImpactXZ->Load(p); | |
982 | } | |
43bfa5be | 983 | break; |
984 | ||
985 | case 3: // Impact-point in the plane Z=0 | |
c72198f1 | 986 | if (!fImpactXY) |
987 | { | |
988 | fImpactXY=new AliPositionObj(p); | |
989 | } | |
990 | else | |
991 | { | |
992 | fImpactXY->Load(p); | |
993 | } | |
43bfa5be | 994 | break; |
995 | ||
996 | default: // Unsupported axis | |
997 | cout << "*AliTrack::SetImpactPoint* Unsupported axis : " << q << endl | |
998 | << " Possible axes are 'X', 'Y' and 'Z'." << endl; | |
999 | break; | |
1000 | } | |
1001 | } | |
1002 | /////////////////////////////////////////////////////////////////////////// | |
c72198f1 | 1003 | AliPosition* AliTrack::GetImpactPoint(TString q) |
43bfa5be | 1004 | { |
1005 | // Provide the position of the impact-point in the plane "q=0". | |
1006 | // Here q denotes one of the axes X, Y or Z. | |
1007 | // Note : The character to denote the axis may be entered in lower or | |
1008 | // in uppercase. | |
43bfa5be | 1009 | Int_t axis=0; |
1010 | if (q=="x" || q=="X") axis=1; | |
1011 | if (q=="y" || q=="Y") axis=2; | |
1012 | if (q=="z" || q=="Z") axis=3; | |
1013 | ||
1014 | switch (axis) | |
1015 | { | |
1016 | case 1: // Impact-point in the plane X=0 | |
1017 | return fImpactYZ; | |
1018 | ||
1019 | case 2: // Impact-point in the plane Y=0 | |
1020 | return fImpactXZ; | |
1021 | ||
1022 | case 3: // Impact-point in the plane Z=0 | |
1023 | return fImpactXY; | |
1024 | ||
1025 | default: // Unsupported axis | |
1026 | cout << "*AliTrack::GetImpactPoint* Unsupported axis : " << q << endl | |
1027 | << " Possible axes are 'X', 'Y' and 'Z'." << endl; | |
c72198f1 | 1028 | return 0; |
43bfa5be | 1029 | } |
1030 | } | |
1031 | /////////////////////////////////////////////////////////////////////////// | |
1032 | void AliTrack::SetId(Int_t id) | |
1033 | { | |
fdbea0ce | 1034 | // Set a user defined unique identifier for this track. |
43bfa5be | 1035 | fUserId=id; |
1036 | } | |
1037 | /////////////////////////////////////////////////////////////////////////// | |
1038 | Int_t AliTrack::GetId() | |
1039 | { | |
fdbea0ce | 1040 | // Provide the user defined unique identifier of this track. |
43bfa5be | 1041 | return fUserId; |
1042 | } | |
1043 | /////////////////////////////////////////////////////////////////////////// | |
c72198f1 | 1044 | void AliTrack::SetClosestPoint(AliPosition& p) |
43bfa5be | 1045 | { |
1046 | // Set position p as the point of closest approach w.r.t. some reference | |
c72198f1 | 1047 | if (!fClosest) |
1048 | { | |
1049 | fClosest=new AliPositionObj(p); | |
1050 | } | |
1051 | else | |
1052 | { | |
1053 | fClosest->Load(p); | |
1054 | } | |
43bfa5be | 1055 | } |
1056 | /////////////////////////////////////////////////////////////////////////// | |
c72198f1 | 1057 | AliPosition* AliTrack::GetClosestPoint() |
43bfa5be | 1058 | { |
1059 | // Provide the point of closest approach w.r.t. some reference | |
1060 | return fClosest; | |
1061 | } | |
1062 | /////////////////////////////////////////////////////////////////////////// | |
2693cb4e | 1063 | void AliTrack::SetChi2(Float_t chi2) |
1064 | { | |
1065 | // Set the chi-squared value of the track fit. | |
1066 | if (chi2<0) | |
1067 | { | |
1068 | cout << " *AliTrack::SetChi2* Invalid chi2 value : " << chi2 << endl; | |
1069 | } | |
1070 | else | |
1071 | { | |
1072 | fChi2=chi2; | |
1073 | } | |
1074 | } | |
1075 | /////////////////////////////////////////////////////////////////////////// | |
1076 | void AliTrack::SetNdf(Int_t ndf) | |
1077 | { | |
1078 | // Set the number of degrees of freedom for the track fit. | |
1079 | if (ndf<0) | |
1080 | { | |
1081 | cout << " *AliTrack::SetNdf* Invalid ndf value : " << ndf << endl; | |
1082 | } | |
1083 | else | |
1084 | { | |
1085 | fNdf=ndf; | |
1086 | } | |
1087 | } | |
1088 | /////////////////////////////////////////////////////////////////////////// | |
1089 | Float_t AliTrack::GetChi2() | |
1090 | { | |
1091 | // Provide the chi-squared value of the track fit. | |
1092 | return fChi2; | |
1093 | } | |
1094 | /////////////////////////////////////////////////////////////////////////// | |
1095 | Int_t AliTrack::GetNdf() | |
1096 | { | |
1097 | // Provide the number of degrees of freedom for the track fit. | |
1098 | return fNdf; | |
1099 | } | |
1100 | /////////////////////////////////////////////////////////////////////////// | |
fdbea0ce | 1101 | void AliTrack::SetParticleCode(Int_t code) |
1102 | { | |
1103 | // Set the user defined particle id code (e.g. the PDF convention). | |
1104 | fCode=code; | |
1105 | } | |
1106 | /////////////////////////////////////////////////////////////////////////// | |
1107 | Int_t AliTrack::GetParticleCode() | |
1108 | { | |
1109 | // Provide the user defined particle id code. | |
1110 | return fCode; | |
1111 | } | |
1112 | /////////////////////////////////////////////////////////////////////////// | |
1fbffa23 | 1113 | void AliTrack::SetParentTrack(AliTrack* t) |
1114 | { | |
1115 | // Set pointer to the parent track. | |
1116 | fParent=t; | |
1117 | } | |
1118 | /////////////////////////////////////////////////////////////////////////// | |
1119 | AliTrack* AliTrack::GetParentTrack() | |
1120 | { | |
1121 | // Provide pointer to the parent track. | |
1122 | return fParent; | |
1123 | } | |
1124 | /////////////////////////////////////////////////////////////////////////// | |
5f25234b | 1125 | void AliTrack::SetProb(Double_t prob) |
1126 | { | |
1127 | // Set hypothesis probability for this track. | |
1128 | fProb=prob; | |
1129 | } | |
1130 | /////////////////////////////////////////////////////////////////////////// | |
1131 | Float_t AliTrack::GetProb() | |
1132 | { | |
1133 | // Provide the hypothesis probability for this track. | |
1134 | return fProb; | |
1135 | } | |
1136 | /////////////////////////////////////////////////////////////////////////// | |
1137 | TObject* AliTrack::Clone(char* name) | |
1138 | { | |
1139 | // Make a deep copy of the current object and provide the pointer to the copy. | |
1140 | // This memberfunction enables automatic creation of new objects of the | |
1141 | // correct type depending on the object type, a feature which may be very useful | |
1142 | // for containers when adding objects in case the container owns the objects. | |
1143 | // This feature allows e.g. AliJet to store either AliTrack objects or | |
1144 | // objects derived from AliTrack via the AddTrack memberfunction, provided | |
1145 | // these derived classes also have a proper Clone memberfunction. | |
1146 | ||
1147 | AliTrack* trk=new AliTrack(*this); | |
1148 | if (name) | |
1149 | { | |
1150 | if (strlen(name)) trk->SetName(name); | |
1151 | } | |
1152 | return trk; | |
1153 | } | |
1154 | /////////////////////////////////////////////////////////////////////////// |