Coding convetion violations fixed.
[u/mrichter/AliRoot.git] / RALICE / AliTrack.cxx
CommitLineData
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//
25eefd00 86// Note : By default all quantities are in GeV, GeV/c or GeV/c**2
87// but the user can indicate the usage of a different scale
88// for the energy-momentum units via the SetEscale() memberfunction.
89// The actual energy-momentum unit scale can be obtained via the
90// GetEscale() memberfunction.
959fbac5 91//
92//--- Author: Nick van Eijndhoven 10-jul-1997 UU-SAP Utrecht
f531a546 93//- Modified: NvE $Date$ UU-SAP Utrecht
959fbac5 94///////////////////////////////////////////////////////////////////////////
95
c72198f1 96#include "Riostream.h"
fcf4326d 97#include "TObjArray.h"
98
99#include "AliBoost.h"
100#include "AliPositionObj.h"
101#include "AliSignal.h"
102#include "AliTimestamp.h"
103#include "AliTrack.h"
d88f97cc 104
105ClassImp(AliTrack) // Class implementation to enable ROOT I/O
106
5f25234b 107AliTrack::AliTrack() : TNamed(),Ali4Vector()
d88f97cc 108{
109// Default constructor
110// All variables initialised to 0
6516b62d 111 Init();
112 Reset();
113}
114///////////////////////////////////////////////////////////////////////////
115void AliTrack::Init()
116{
117// Initialisation of pointers etc...
d88f97cc 118 fDecays=0;
959fbac5 119 fSignals=0;
5f25234b 120 fHypotheses=0;
c72198f1 121 fBegin=0;
122 fEnd=0;
c5555bc0 123 fRef=0;
c72198f1 124 fImpactXY=0;
125 fImpactXZ=0;
126 fImpactYZ=0;
127 fClosest=0;
1fbffa23 128 fParent=0;
ea0b5b7f 129 fFit=0;
a7dc0627 130 fTstamp=0;
25eefd00 131 fEscale=1;
d88f97cc 132}
133///////////////////////////////////////////////////////////////////////////
134AliTrack::~AliTrack()
135{
5f25234b 136// Destructor to delete memory allocated for decay tracks array.
d0120ca2 137// This destructor automatically cleares all references to this AliTrack
138// from all the related AliSignal objects.
5f25234b 139 Int_t nsig=GetNsignals();
140 for (Int_t i=1; i<=nsig; i++)
141 {
142 AliSignal* s=GetSignal(i);
d0120ca2 143 if (s) s->RemoveTrack(*this,0);
5f25234b 144 }
145
d88f97cc 146 if (fDecays)
147 {
d88f97cc 148 delete fDecays;
149 fDecays=0;
150 }
959fbac5 151 if (fSignals)
152 {
959fbac5 153 delete fSignals;
154 fSignals=0;
155 }
5f25234b 156 if (fHypotheses)
c72198f1 157 {
5f25234b 158 delete fHypotheses;
159 fHypotheses=0;
c72198f1 160 }
161 if (fBegin)
162 {
163 delete fBegin;
164 fBegin=0;
165 }
166 if (fEnd)
167 {
168 delete fEnd;
169 fEnd=0;
170 }
c5555bc0 171 if (fRef)
172 {
173 delete fRef;
174 fRef=0;
175 }
c72198f1 176 if (fImpactXY)
177 {
178 delete fImpactXY;
179 fImpactXY=0;
180 }
181 if (fImpactXZ)
182 {
183 delete fImpactXZ;
184 fImpactXZ=0;
185 }
186 if (fImpactYZ)
187 {
188 delete fImpactYZ;
189 fImpactYZ=0;
190 }
191 if (fClosest)
192 {
193 delete fClosest;
194 fClosest=0;
195 }
ea0b5b7f 196 if (fFit)
197 {
198 delete fFit;
199 fFit=0;
200 }
a7dc0627 201 if (fTstamp)
202 {
203 delete fTstamp;
204 fTstamp=0;
205 }
d88f97cc 206}
207///////////////////////////////////////////////////////////////////////////
261c0caf 208AliTrack::AliTrack(const AliTrack& t) : TNamed(t),Ali4Vector(t)
6516b62d 209{
210// Copy constructor
211 Init();
212
c72198f1 213 fQ=t.fQ;
5f25234b 214 fProb=t.fProb;
c72198f1 215 if (t.fBegin) fBegin=new AliPositionObj(*(t.fBegin));
216 if (t.fEnd) fEnd=new AliPositionObj(*(t.fEnd));
c5555bc0 217 if (t.fRef) fRef=new AliPositionObj(*(t.fRef));
c72198f1 218 if (t.fImpactXY) fImpactXY=new AliPositionObj(*(t.fImpactXY));
219 if (t.fImpactXZ) fImpactXZ=new AliPositionObj(*(t.fImpactXZ));
220 if (t.fImpactYZ) fImpactYZ=new AliPositionObj(*(t.fImpactYZ));
221 if (t.fClosest) fClosest=new AliPositionObj(*(t.fClosest));
ea0b5b7f 222 if (t.fFit) fFit=t.fFit->Clone();
a7dc0627 223 if (t.fTstamp) fTstamp=new AliTimestamp(*(t.fTstamp));
c72198f1 224 fUserId=t.fUserId;
25eefd00 225 fEscale=t.fEscale;
c72198f1 226 fCode=t.fCode;
1fbffa23 227 fParent=t.fParent;
c72198f1 228
5f25234b 229 Int_t ndec=t.GetNdecay();
230 if (ndec)
6516b62d 231 {
5f25234b 232 fDecays=new TObjArray(ndec);
6516b62d 233 fDecays->SetOwner();
5f25234b 234 for (Int_t it=1; it<=ndec; it++)
6516b62d 235 {
c72198f1 236 AliTrack* tx=t.GetDecayTrack(it);
6516b62d 237 fDecays->Add(new AliTrack(*tx));
238 }
239 }
240
5f25234b 241 Int_t nsig=t.GetNsignals();
242 if (nsig)
6516b62d 243 {
5f25234b 244 fSignals=new TObjArray(nsig);
245 for (Int_t is=1; is<=nsig; is++)
6516b62d 246 {
c72198f1 247 AliSignal* sx=t.GetSignal(is);
6516b62d 248 fSignals->Add(sx);
249 }
250 }
5f25234b 251
252 Int_t nhyp=t.GetNhypotheses();
253 if (nhyp)
254 {
255 fHypotheses=new TObjArray(nhyp);
256 fHypotheses->SetOwner();
257 for (Int_t ih=1; ih<=nhyp; ih++)
258 {
259 AliTrack* tx=t.GetTrackHypothesis(ih);
260 fHypotheses->Add(new AliTrack(*tx));
261 }
262 }
6516b62d 263}
264///////////////////////////////////////////////////////////////////////////
d88f97cc 265void AliTrack::Reset()
266{
35044448 267// Reset all variables to 0 and delete all auto-generated decay tracks.
25eefd00 268// Note : The scale for the energy/momentum units will not be changed.
d88f97cc 269 fQ=0;
43bfa5be 270 fUserId=0;
fdbea0ce 271 fCode=0;
5f25234b 272 fProb=0;
d88f97cc 273 Double_t a[4]={0,0,0,0};
274 SetVector(a,"sph");
1fbffa23 275 fParent=0;
d88f97cc 276 if (fDecays)
277 {
d88f97cc 278 delete fDecays;
279 fDecays=0;
280 }
959fbac5 281 if (fSignals)
282 {
959fbac5 283 delete fSignals;
284 fSignals=0;
285 }
5f25234b 286 if (fHypotheses)
f531a546 287 {
5f25234b 288 delete fHypotheses;
289 fHypotheses=0;
f531a546 290 }
c72198f1 291 if (fBegin)
292 {
293 delete fBegin;
294 fBegin=0;
295 }
296 if (fEnd)
297 {
298 delete fEnd;
299 fEnd=0;
300 }
c5555bc0 301 if (fRef)
302 {
303 delete fRef;
304 fRef=0;
305 }
c72198f1 306 if (fImpactXY)
307 {
308 delete fImpactXY;
309 fImpactXY=0;
310 }
311 if (fImpactXZ)
312 {
313 delete fImpactXZ;
314 fImpactXZ=0;
315 }
316 if (fImpactYZ)
317 {
318 delete fImpactYZ;
319 fImpactYZ=0;
320 }
321 if (fClosest)
322 {
323 delete fClosest;
324 fClosest=0;
325 }
ea0b5b7f 326 if (fFit)
327 {
328 delete fFit;
329 fFit=0;
330 }
a7dc0627 331 if (fTstamp)
332 {
333 delete fTstamp;
334 fTstamp=0;
335 }
d88f97cc 336}
337///////////////////////////////////////////////////////////////////////////
338void AliTrack::Set3Momentum(Ali3Vector& p)
339{
261c0caf 340// Set the track parameters according to the 3-momentum p.
341// In case the mass was not yet set, the energy is set to correspond to m=0.
959fbac5 342 Set3Vector(p);
261c0caf 343 Double_t inv=GetInvariant();
344 if (inv<0) SetMass(0.);
d88f97cc 345}
346///////////////////////////////////////////////////////////////////////////
347void AliTrack::Set4Momentum(Ali4Vector& p)
348{
349// Set the track parameters according to the 4-momentum p
fcf4326d 350 Double_t eE=p.GetScalar();
959fbac5 351 Double_t dE=p.GetResultError();
d88f97cc 352 Ali3Vector pv=p.Get3Vector();
fcf4326d 353 SetVector(eE,pv);
959fbac5 354 SetScalarError(dE);
d88f97cc 355}
356///////////////////////////////////////////////////////////////////////////
959fbac5 357void AliTrack::SetMass(Double_t m,Double_t dm)
d88f97cc 358{
359// Set the particle mass
959fbac5 360// The default value for the error dm is 0.
361 Double_t inv=pow(m,2);
362 Double_t dinv=fabs(2.*m*dm);
363 SetInvariant(inv,dinv);
d88f97cc 364}
365///////////////////////////////////////////////////////////////////////////
366void AliTrack::SetCharge(Float_t q)
367{
368// Set the particle charge
369 fQ=q;
370}
371///////////////////////////////////////////////////////////////////////////
1f241680 372void AliTrack::Data(TString f,TString u)
d88f97cc 373{
374// Provide track information within the coordinate frame f
1f241680 375//
376// The string argument "u" allows to choose between different angular units
377// in case e.g. a spherical frame is selected.
378// u = "rad" : angles provided in radians
379// "deg" : angles provided in degrees
380//
381// The defaults are f="car" and u="rad".
382
959fbac5 383 Double_t m=GetMass();
384 Double_t dm=GetResultError();
5f25234b 385 const char* name=GetName();
386 const char* title=GetTitle();
387
388 cout << " *" << ClassName() << "::Data*";
ea0b5b7f 389 if (strlen(name)) cout << " Name : " << name;
390 if (strlen(title)) cout << " Title : " << title;
5f25234b 391 cout << endl;
a7dc0627 392 if (fTstamp) fTstamp->Date(1);
5f25234b 393 cout << " Id : " << fUserId << " Code : " << fCode
394 << " m : " << m << " dm : " << dm << " Charge : " << fQ
395 << " p : " << GetMomentum() << endl;
396 cout << " Nhypotheses : " << GetNhypotheses() << " Ndecay-tracks : " << GetNdecay()
25eefd00 397 << " Nsignals : " << GetNsignals() << " Energy scale : " << fEscale << " GeV" << endl;
ea0b5b7f 398 if (fParent)
399 {
400 cout << " Parent track Id : " << fParent->GetId() << " Code : " << fParent->GetParticleCode()
401 << " m : " << fParent->GetMass() << " Q : " << fParent->GetCharge()
402 << " p : " << fParent->GetMomentum();
403 const char* pname=fParent->GetName();
404 const char* ptitle=fParent->GetTitle();
405 if (strlen(pname)) cout << " Name : " << pname;
406 if (strlen(ptitle)) cout << " Title : " << ptitle;
407 cout << endl;
408 }
409 if (fFit)
410 {
411 cout << " Fit details present in object of class " << fFit->ClassName() << endl;
412 if (fFit->InheritsFrom("AliSignal")) ((AliSignal*)fFit)->List(-1);
413 }
1f241680 414 Ali4Vector::Data(f,u);
d88f97cc 415}
416///////////////////////////////////////////////////////////////////////////
1f241680 417void AliTrack::List(TString f,TString u)
d88f97cc 418{
419// Provide current track and decay level 1 information within coordinate frame f
1f241680 420//
421// The string argument "u" allows to choose between different angular units
422// in case e.g. a spherical frame is selected.
423// u = "rad" : angles provided in radians
424// "deg" : angles provided in degrees
425//
426// The defaults are f="car" and u="rad".
d88f97cc 427
1f241680 428 Data(f,u); // Information of the current track
e51b7d1a 429 if (fBegin) { cout << " Begin-point :"; fBegin->Data(f,u); }
430 if (fEnd) { cout << " End-point :"; fEnd->Data(f,u); }
431 if (fRef) { cout << " Ref-point :"; fRef->Data(f,u); }
d88f97cc 432
433 // Decay products of this track
434 AliTrack* td;
5f25234b 435 for (Int_t id=1; id<=GetNdecay(); id++)
d88f97cc 436 {
437 td=GetDecayTrack(id);
438 if (td)
439 {
440 cout << " ---Level 1 sec. track no. " << id << endl;
1f241680 441 td->Data(f,u);
d88f97cc 442 }
443 else
444 {
5f25234b 445 cout << " *AliTrack::List* Error : Empty decay track slot." << endl;
d88f97cc 446 }
447 }
448}
449///////////////////////////////////////////////////////////////////////////
1f241680 450void AliTrack::ListAll(TString f,TString u)
d88f97cc 451{
452// Provide complete track and decay information within the coordinate frame f
1f241680 453//
454// The string argument "u" allows to choose between different angular units
455// in case e.g. a spherical frame is selected.
456// u = "rad" : angles provided in radians
457// "deg" : angles provided in degrees
458//
459// The defaults are f="car" and u="rad".
d88f97cc 460
1f241680 461 Data(f,u); // Information of the current track
e51b7d1a 462 if (fBegin) { cout << " Begin-point :"; fBegin->Data(f,u); }
463 if (fEnd) { cout << " End-point :"; fEnd->Data(f,u); }
464 if (fRef) { cout << " Ref-point :"; fRef->Data(f,u); }
5f25234b 465
466 Int_t nhyp=GetNhypotheses();
467 if (nhyp)
468 {
469 cout << " List of the " << nhyp << " track hypotheses : " << endl;
470 for (Int_t ih=1; ih<=nhyp; ih++)
471 {
472 AliTrack* tx=GetTrackHypothesis(ih);
1f241680 473 if (tx) tx->Data(f,u);
5f25234b 474 }
475 }
476
477 Int_t nsig=GetNsignals();
478 if (nsig)
959fbac5 479 {
d0a8ef71 480 cout << " List of the corresponding slots for the " << nsig
481 << " related signals : " << endl;
482 AliPosition r;
483 Int_t nrefs,jslot;
484 TArrayI slotarr;
5f25234b 485 for (Int_t is=1; is<=nsig; is++)
486 {
487 AliSignal* sx=GetSignal(is);
d0a8ef71 488 if (sx)
489 {
490 nrefs=sx->GetIndices(this,slotarr,0);
491 for (Int_t jref=0; jref<nrefs; jref++)
492 {
493 jslot=slotarr.At(jref);
494 sx->List(jslot);
495 }
496 r=sx->GetPosition();
497 cout << " Position";
1f241680 498 r.Data(f,u);
d0a8ef71 499 }
5f25234b 500 }
959fbac5 501 }
d88f97cc 502
503 AliTrack* t=this;
1f241680 504 Dumps(t,1,f,u); // Information of all decay products
d88f97cc 505}
506//////////////////////////////////////////////////////////////////////////
fcf4326d 507void AliTrack::Dumps(const AliTrack* t,Int_t n,TString f,TString u)
d88f97cc 508{
509// Recursively provide the info of all decay levels of this track
510 AliTrack* td;
511 for (Int_t id=1; id<=t->GetNdecay(); id++)
512 {
513 td=t->GetDecayTrack(id);
514 if (td)
515 {
516 cout << " ---Level " << n << " sec. track no. " << id << endl;
1f241680 517 td->Data(f,u);
5f25234b 518
519 Int_t nhyp=td->GetNhypotheses();
520 if (nhyp)
521 {
522 cout << " List of the " << nhyp << " track hypotheses : " << endl;
523 for (Int_t ih=1; ih<=nhyp; ih++)
524 {
525 AliTrack* tx=td->GetTrackHypothesis(ih);
1f241680 526 if (tx) tx->Data(f,u);
5f25234b 527 }
528 }
529
530 Int_t nsig=td->GetNsignals();
531 if (nsig)
959fbac5 532 {
5f25234b 533 cout << " List of the " << nsig << " related signals : " << endl;
534 for (Int_t is=1; is<=nsig; is++)
535 {
536 AliSignal* sx=td->GetSignal(is);
1f241680 537 if (sx) sx->Data(f,u);
5f25234b 538 }
959fbac5 539 }
d88f97cc 540
541 // Go for next decay level of this decay track recursively
1f241680 542 Dumps(td,n+1,f,u);
d88f97cc 543 }
544 else
545 {
5f25234b 546 cout << " *AliTrack::Dumps* Error : Empty decay track slot." << endl;
d88f97cc 547 }
548 }
549}
550//////////////////////////////////////////////////////////////////////////
25eefd00 551Double_t AliTrack::GetMomentum(Float_t scale)
d88f97cc 552{
959fbac5 553// Provide the value of the track 3-momentum.
25eefd00 554// By default the momentum is returned in the units as it was stored in the track
555// structure. However, the user can select a different momentum unit scale by
556// specification of the scale parameter.
557// The convention is that scale=1 corresponds to GeV/c, so specification
558// of scale=0.001 will provide the momentum in MeV/c.
959fbac5 559// The error can be obtained by invoking GetResultError() after
560// invokation of GetMomentum().
25eefd00 561
959fbac5 562 Double_t norm=fV.GetNorm();
d071d629 563 fDresult=fV.GetResultError();
25eefd00 564 if (scale>0)
565 {
566 norm*=fEscale/scale;
567 fDresult*=fEscale/scale;
568 }
959fbac5 569 return norm;
d88f97cc 570}
571///////////////////////////////////////////////////////////////////////////
25eefd00 572Ali3Vector AliTrack::Get3Momentum(Float_t scale) const
d88f97cc 573{
25eefd00 574// Provide the track 3-momentum.
575// By default the components of the 3-momentum are returned in the units
576// as they were stored in the track structure.
577// However, the user can select a different momentum unit scale for the
578// components by specification of the scale parameter.
579// The convention is that scale=1 corresponds to GeV/c, so specification
580// of scale=0.001 will provide the 3-momentum in MeV/c.
581
582 Ali3Vector p=Get3Vector();
583 if (scale>0) p*=fEscale/scale;
584 return p;
d88f97cc 585}
586///////////////////////////////////////////////////////////////////////////
25eefd00 587Double_t AliTrack::GetMass(Float_t scale)
d88f97cc 588{
959fbac5 589// Provide the particle mass.
25eefd00 590// By default the mass is returned in the units as it was stored in the track
591// structure. However, the user can select a different mass unit scale by
592// specification of the scale parameter.
593// The convention is that scale=1 corresponds to GeV/c**2, so specification
594// of scale=0.001 will provide the mass in MeV/c**2.
959fbac5 595// The error can be obtained by invoking GetResultError() after
596// invokation of GetMass().
25eefd00 597
959fbac5 598 Double_t inv=GetInvariant();
599 Double_t dinv=GetResultError();
600 Double_t dm=0;
601 if (inv >= 0)
602 {
603 Double_t m=sqrt(inv);
604 if (m) dm=dinv/(2.*m);
25eefd00 605 if (scale>0)
606 {
607 m*=fEscale/scale;
608 dm*=fEscale/scale;
609 }
959fbac5 610 fDresult=dm;
611 return m;
612 }
613 else
614 {
615 cout << "*AliTrack::GetMass* Unphysical situation m**2 = " << inv << endl;
616 cout << " Value 0 will be returned." << endl;
617 fDresult=dm;
618 return 0;
619 }
d88f97cc 620}
621///////////////////////////////////////////////////////////////////////////
261c0caf 622Float_t AliTrack::GetCharge() const
d88f97cc 623{
624// Provide the particle charge
625 return fQ;
626}
627///////////////////////////////////////////////////////////////////////////
25eefd00 628Double_t AliTrack::GetEnergy(Float_t scale)
d88f97cc 629{
959fbac5 630// Provide the particle's energy.
25eefd00 631// By default the energy is returned in the units as it was stored in the track
632// structure. However, the user can select a different energy unit scale by
633// specification of the scale parameter.
634// The convention is that scale=1 corresponds to GeV, so specification
635// of scale=0.001 will provide the energy in MeV.
959fbac5 636// The error can be obtained by invoking GetResultError() after
637// invokation of GetEnergy().
fcf4326d 638 Double_t eE=GetScalar();
639 if (eE>0)
959fbac5 640 {
25eefd00 641 if (scale>0)
642 {
fcf4326d 643 eE*=fEscale/scale;
25eefd00 644 fDresult*=fEscale/scale;
645 }
fcf4326d 646 return eE;
959fbac5 647 }
648 else
649 {
fcf4326d 650 cout << "*AliTrack::GetEnergy* Unphysical situation E = " << eE << endl;
959fbac5 651 cout << " Value 0 will be returned." << endl;
652 return 0;
653 }
d88f97cc 654}
655///////////////////////////////////////////////////////////////////////////
656void AliTrack::Decay(Double_t m1,Double_t m2,Double_t thcms,Double_t phicms)
657{
658// Perform 2-body decay of current track
659// m1 : mass of decay product 1
660// m2 : mass of decay product 2
661// thcms : cms theta decay angle (in rad.) of m1
662// phicms : cms phi decay angle (in rad.) of m1
663
fcf4326d 664 Double_t mM=GetMass();
d88f97cc 665
666// Compute the 4-momenta of the decay products in the cms
667// Note : p2=p1=pnorm for a 2-body decay
959fbac5 668 Double_t e1=0;
fcf4326d 669 if (mM) e1=((mM*mM)+(m1*m1)-(m2*m2))/(2.*mM);
959fbac5 670 Double_t e2=0;
fcf4326d 671 if (mM) e2=((mM*mM)+(m2*m2)-(m1*m1))/(2.*mM);
d88f97cc 672 Double_t pnorm=(e1*e1)-(m1*m1);
673 if (pnorm>0.)
674 {
675 pnorm=sqrt(pnorm);
676 }
677 else
678 {
679 pnorm=0;
680 }
681
682 Double_t a[3];
683 a[0]=pnorm;
684 a[1]=thcms;
685 a[2]=phicms;
686 Ali3Vector p;
687 p.SetVector(a,"sph");
688
689 Ali4Vector pprim1;
690 pprim1.SetVector(e1,p);
959fbac5 691 pprim1.SetInvariant(m1*m1);
d88f97cc 692
693 Ali4Vector pprim2;
694 p*=-1;
695 pprim2.SetVector(e2,p);
959fbac5 696 pprim2.SetInvariant(m2*m2);
d88f97cc 697
698 // Determine boost parameters from the parent particle
fcf4326d 699 Double_t eE=GetEnergy();
d88f97cc 700 p=Get3Vector();
701 Ali4Vector pmu;
fcf4326d 702 pmu.SetVector(eE,p);
d88f97cc 703
704 AliBoost q;
705 q.Set4Momentum(pmu);
706
707 Ali4Vector p1=q.Inverse(pprim1); // Boost decay product 1
708 Ali4Vector p2=q.Inverse(pprim2); // Boost decay product 2
709
710 // Enter the boosted data into the decay tracks array
711 if (fDecays)
712 {
d88f97cc 713 delete fDecays;
6516b62d 714 fDecays=0;
d88f97cc 715 }
5f25234b 716 fDecays=new TObjArray(2);
6516b62d 717 fDecays->SetOwner();
d88f97cc 718
719 fDecays->Add(new AliTrack);
720 ((AliTrack*)fDecays->At(0))->Set4Momentum(p1);
959fbac5 721 ((AliTrack*)fDecays->At(0))->SetMass(m1);
d88f97cc 722 fDecays->Add(new AliTrack);
723 ((AliTrack*)fDecays->At(1))->Set4Momentum(p2);
d88f97cc 724 ((AliTrack*)fDecays->At(1))->SetMass(m2);
725}
726///////////////////////////////////////////////////////////////////////////
261c0caf 727Int_t AliTrack::GetNdecay() const
d88f97cc 728{
729// Provide the number of decay produced tracks
5f25234b 730 Int_t ndec=0;
731 if (fDecays) ndec=fDecays->GetEntries();
732 return ndec;
d88f97cc 733}
734///////////////////////////////////////////////////////////////////////////
261c0caf 735AliTrack* AliTrack::GetDecayTrack(Int_t j) const
d88f97cc 736{
737// Provide decay produced track number j
738// Note : j=1 denotes the first decay track
6516b62d 739 if (!fDecays)
d88f97cc 740 {
6516b62d 741 cout << " *AliTrack::GetDecayTrack* No tracks present." << endl;
742 return 0;
d88f97cc 743 }
744 else
745 {
5f25234b 746 if ((j >= 1) && (j <= GetNdecay()))
6516b62d 747 {
748 return (AliTrack*)fDecays->At(j-1);
749 }
750 else
751 {
752 cout << " *AliTrack* decay track number : " << j << " out of range."
5f25234b 753 << " Ndec = " << GetNdecay() << endl;
6516b62d 754 return 0;
755 }
d88f97cc 756 }
757}
758///////////////////////////////////////////////////////////////////////////
5f25234b 759void AliTrack::RemoveDecays()
760{
761// Remove all decay tracks from this track.
762 if (fDecays)
763 {
764 delete fDecays;
765 fDecays=0;
766 }
767}
768///////////////////////////////////////////////////////////////////////////
d0120ca2 769void AliTrack::AddSignal(AliSignal& s,Int_t mode)
959fbac5 770{
771// Relate an AliSignal object to this track.
d0120ca2 772//
773// mode = 0 : Only the reference to the specified signal is stored in
774// the current track, without storing the (backward) reference
775// to this track into the AliSignal structure.
776// 1 : The (backward) reference to the current track is also automatically
777// stored into the AliSignal (or derived) object specified in the
778// input argument.
779//
780// The default is mode=0.
781
5f25234b 782 if (!fSignals) fSignals=new TObjArray(1);
783
784 // Check if this signal is already stored for this track
785 Int_t nsig=GetNsignals();
786 for (Int_t i=0; i<nsig; i++)
787 {
788 if (&s==fSignals->At(i)) return;
789 }
790
959fbac5 791 fSignals->Add(&s);
d0120ca2 792 if (mode==1) s.AddTrack(*this,0);
959fbac5 793}
794///////////////////////////////////////////////////////////////////////////
d0120ca2 795void AliTrack::RemoveSignal(AliSignal& s,Int_t mode)
959fbac5 796{
5f25234b 797// Remove related AliSignal object from this track.
d0120ca2 798//
799// mode = 0 : Only the reference to the specified signal is removed from
800// the current track, without removing the (backward) reference(s)
801// to this track from the AliSignal structure.
802// 1 : The (backward) reference(s) to the current track are also automatically
803// removed from the AliSignal (or derived) object specified in the
804// input argument.
805//
806// The default is mode=1.
807
959fbac5 808 if (fSignals)
809 {
810 AliSignal* test=(AliSignal*)fSignals->Remove(&s);
5f25234b 811 if (test) fSignals->Compress();
812 }
d0120ca2 813 if (mode==1) s.RemoveTrack(*this,0);
5f25234b 814}
815///////////////////////////////////////////////////////////////////////////
d0120ca2 816void AliTrack::RemoveSignals(Int_t mode)
5f25234b 817{
818// Remove all related AliSignal objects from this track.
d0120ca2 819//
820// mode = 0 : All signal references are removed from the current track,
821// without removing the (backward) references to this track from
822// the corresponding AliSignal objects.
823// 1 : The (backward) references to the current track are also automatically
824// removed from the corresponding AliSignal (or derived) objects.
825//
826// The default is mode=1.
827
828 if (!fSignals) return;
829
830 Int_t ns=GetNsignals();
831 for (Int_t i=0; i<ns; i++)
5f25234b 832 {
d0120ca2 833 AliSignal* sx=(AliSignal*)fSignals->At(i);
834 if (sx && mode==1) sx->RemoveTrack(*this,0);
959fbac5 835 }
d0120ca2 836
837 delete fSignals;
838 fSignals=0;
959fbac5 839}
840///////////////////////////////////////////////////////////////////////////
261c0caf 841Int_t AliTrack::GetNsignals() const
959fbac5 842{
843// Provide the number of related AliSignals.
5f25234b 844 Int_t nsig=0;
845 if (fSignals) nsig=fSignals->GetEntries();
846 return nsig;
959fbac5 847}
848///////////////////////////////////////////////////////////////////////////
caa58e1a 849Int_t AliTrack::GetNsignals(const char* classname) const
850{
851// Provide the number of stored signals of the specified class.
852
853 Int_t nsigs=0;
854 for (Int_t isig=1; isig<=GetNsignals(); isig++)
855 {
856 TObject* obj=GetSignal(isig);
857 if (!obj) continue;
858
859 if (obj->InheritsFrom(classname)) nsigs++;
860 }
861 return nsigs;
862}
863///////////////////////////////////////////////////////////////////////////
261c0caf 864AliSignal* AliTrack::GetSignal(Int_t j) const
959fbac5 865{
866// Provide the related AliSignal number j.
867// Note : j=1 denotes the first signal.
6516b62d 868 if (!fSignals)
959fbac5 869 {
6516b62d 870 cout << " *AliTrack::GetSignal* No signals present." << endl;
871 return 0;
959fbac5 872 }
873 else
874 {
5f25234b 875 if ((j >= 1) && (j <= GetNsignals()))
6516b62d 876 {
877 return (AliSignal*)fSignals->At(j-1);
878 }
879 else
880 {
881 cout << " *AliTrack* signal number : " << j << " out of range."
5f25234b 882 << " Nsig = " << GetNsignals() << endl;
6516b62d 883 return 0;
884 }
959fbac5 885 }
886}
887///////////////////////////////////////////////////////////////////////////
5f25234b 888void AliTrack::AddTrackHypothesis(AliTrack& t)
959fbac5 889{
5f25234b 890// Relate a track hypothesis to this track.
891// Note : a private copy of the input track will be made via the Clone()
892// facility.
893 if (!fHypotheses)
c72198f1 894 {
5f25234b 895 fHypotheses=new TObjArray(1);
896 fHypotheses->SetOwner();
c72198f1 897 }
5f25234b 898 fHypotheses->Add(t.Clone());
959fbac5 899}
900///////////////////////////////////////////////////////////////////////////
5f25234b 901void AliTrack::AddTrackHypothesis(Double_t prob,Double_t m,Double_t dm)
959fbac5 902{
5f25234b 903// Add a track hypothesis by explicitly setting the mass and probability.
904// This will affect e.g. the hypothesis track's energy, since the momentum
905// and all other attributes will be copied from the current track.
906//
907// Input arguments :
908// -----------------
909// prob=probalility m=mass value dm=error on the mass value.
910// The default value for the mass error dm is 0.
911
912 AliTrack t(*this);
913 t.RemoveDecays();
914 t.RemoveTrackHypotheses();
915 t.RemoveSignals();
916 t.SetTitle("Mass hypothesis");
917 t.SetMass(m,dm);
918 t.SetProb(prob);
919 AddTrackHypothesis(t);
959fbac5 920}
921///////////////////////////////////////////////////////////////////////////
5f25234b 922void AliTrack::RemoveTrackHypothesis(AliTrack& t)
959fbac5 923{
5f25234b 924// Remove the specified track hypothesis from this track.
925 if (fHypotheses)
c72198f1 926 {
5f25234b 927 AliTrack* test=(AliTrack*)fHypotheses->Remove(&t);
928 if (test) fHypotheses->Compress();
c72198f1 929 }
959fbac5 930}
931///////////////////////////////////////////////////////////////////////////
5f25234b 932void AliTrack::RemoveTrackHypotheses()
959fbac5 933{
5f25234b 934// Remove all track hypotheses from this track.
935 if (fHypotheses)
936 {
937 delete fHypotheses;
938 fHypotheses=0;
939 }
f531a546 940}
941///////////////////////////////////////////////////////////////////////////
261c0caf 942Int_t AliTrack::GetNhypotheses() const
f531a546 943{
5f25234b 944// Provide the number of track hypotheses.
945 Int_t nhyp=0;
946 if (fHypotheses) nhyp=fHypotheses->GetEntries();
947 return nhyp;
f531a546 948}
949///////////////////////////////////////////////////////////////////////////
261c0caf 950AliTrack* AliTrack::GetTrackHypothesis(Int_t j) const
f531a546 951{
5f25234b 952// Provide the j-th track hypothesis.
953// Note : j=1 denotes the first hypothesis.
f531a546 954// Default : j=0 ==> Hypothesis with highest probability.
f531a546 955
5f25234b 956 if (!fHypotheses) return 0;
957
958 Int_t nhyp=GetNhypotheses();
f531a546 959
960 // Check validity of index j
5f25234b 961 if (j<0 || j>nhyp)
f531a546 962 {
5f25234b 963 cout << " *AliTrack* hypothesis number : " << j << " out of range."
964 << " Nhyp = " << nhyp << endl;
965 return 0;
966 }
f531a546 967
5f25234b 968 AliTrack* t=0;
969
970 if (j==0) // Provide track hypothesis with highest probability
f531a546 971 {
5f25234b 972 Float_t prob=0;
973 t=(AliTrack*)fHypotheses->At(0);
974 if (t) prob=t->GetProb();
975 Float_t probx=0;
976 for (Int_t ih=1; ih<nhyp; ih++)
f531a546 977 {
5f25234b 978 AliTrack* tx=(AliTrack*)fHypotheses->At(ih);
979 if (tx)
f531a546 980 {
5f25234b 981 probx=tx->GetProb();
982 if (probx > prob) t=tx;
f531a546 983 }
984 }
5f25234b 985 return t;
986 }
987 else // Provide requested j-th track hypothesis
988 {
989 return (AliTrack*)fHypotheses->At(j-1);
f531a546 990 }
f531a546 991}
992///////////////////////////////////////////////////////////////////////////
5f25234b 993void AliTrack::SetBeginPoint(AliPosition& p)
f531a546 994{
5f25234b 995// Store the position of the track begin-point.
f4d1f676 996 if (fBegin) delete fBegin;
997 fBegin=new AliPositionObj(p);
f531a546 998}
999///////////////////////////////////////////////////////////////////////////
fcf4326d 1000AliPosition* AliTrack::GetBeginPoint() const
f531a546 1001{
5f25234b 1002// Provide the position of the track begin-point.
1003 return fBegin;
1004}
1005///////////////////////////////////////////////////////////////////////////
1006void AliTrack::SetEndPoint(AliPosition& p)
1007{
1008// Store the position of the track end-point.
f4d1f676 1009 if (fEnd) delete fEnd;
1010 fEnd=new AliPositionObj(p);
f531a546 1011}
1012///////////////////////////////////////////////////////////////////////////
fcf4326d 1013AliPosition* AliTrack::GetEndPoint() const
5f25234b 1014{
1015// Provide the position of the track end-point.
1016 return fEnd;
1017}
1018///////////////////////////////////////////////////////////////////////////
c5555bc0 1019void AliTrack::SetReferencePoint(AliPosition& p)
1020{
1021// Store the position of the track reference-point.
1022// The reference-point is the point on the track in which the
1023// 3-momentum vector components have been defined.
1024// This reference point is the preferable point to start track extrapolations
1025// etc... which are sensitive to the components of the 3-momentum vector.
f4d1f676 1026 if (fRef) delete fRef;
1027 fRef=new AliPositionObj(p);
c5555bc0 1028}
1029///////////////////////////////////////////////////////////////////////////
fcf4326d 1030AliPosition* AliTrack::GetReferencePoint() const
c5555bc0 1031{
1032// Provide the position of the track reference-point.
1033// The reference-point is the point on the track in which the
1034// 3-momentum vector components have been defined.
1035// This reference point is the preferable point to start track extrapolations
1036// etc... which are sensitive to the components of the 3-momentum vector.
1037 return fRef;
1038}
1039///////////////////////////////////////////////////////////////////////////
5f25234b 1040void AliTrack::SetMass()
f531a546 1041{
5f25234b 1042// Set the mass and error to the value of the hypothesis with highest prob.
f531a546 1043
5f25234b 1044 Double_t m=0,dm=0;
1045
1046 // Select mass hypothesis with highest probability
1047 AliTrack* t=GetTrackHypothesis(0);
1048 if (t)
f531a546 1049 {
5f25234b 1050 m=t->GetMass();
1051 dm=t->GetResultError();
1052 SetMass(m,dm);
f531a546 1053 }
1054 else
1055 {
5f25234b 1056 cout << " *AliTrack::SetMass()* No hypothesis present => No action." << endl;
f531a546 1057 }
1058}
1059///////////////////////////////////////////////////////////////////////////
25eefd00 1060Double_t AliTrack::GetPt(Float_t scale)
d071d629 1061{
25eefd00 1062// Provide the transverse momentum value w.r.t. z-axis.
1063// By default the value is returned in the units as it was stored in the track
1064// structure. However, the user can select a different momentum unit scale by
1065// specification of the scale parameter.
1066// The convention is that scale=1 corresponds to GeV/c, so specification
1067// of scale=0.001 will provide the transverse momentum in MeV/c.
d071d629 1068// The error on the value can be obtained by GetResultError()
1069// after invokation of GetPt().
1070 Ali3Vector v;
1071 v=GetVecTrans();
1072 Double_t norm=v.GetNorm();
1073 fDresult=v.GetResultError();
25eefd00 1074 if (scale>0)
1075 {
1076 norm*=fEscale/scale;
1077 fDresult*=fEscale/scale;
1078 }
d071d629 1079
1080 return norm;
1081}
1082///////////////////////////////////////////////////////////////////////////
25eefd00 1083Double_t AliTrack::GetPl(Float_t scale)
d071d629 1084{
25eefd00 1085// Provide the longitudinal momentum value w.r.t. z-axis.
1086// By default the value is returned in the units as it was stored in the track
1087// structure. However, the user can select a different momentum unit scale by
1088// specification of the scale parameter.
1089// The convention is that scale=1 corresponds to GeV/c, so specification
1090// of scale=0.001 will provide the longitudinal momentum in MeV/c.
8adaf597 1091// Note : the returned value can also be negative.
d071d629 1092// The error on the value can be obtained by GetResultError()
1093// after invokation of GetPl().
25eefd00 1094
d071d629 1095 Ali3Vector v;
1096 v=GetVecLong();
8adaf597 1097
1098 Double_t pl=v.GetNorm();
d071d629 1099 fDresult=v.GetResultError();
1100
8adaf597 1101 Double_t a[3];
1102 v.GetVector(a,"sph");
1103 if (cos(a[1])<0) pl=-pl;
25eefd00 1104 if (scale>0)
1105 {
1106 pl*=fEscale/scale;
1107 fDresult*=fEscale/scale;
1108 }
8adaf597 1109
1110 return pl;
d071d629 1111}
1112///////////////////////////////////////////////////////////////////////////
25eefd00 1113Double_t AliTrack::GetEt(Float_t scale)
d071d629 1114{
25eefd00 1115// Provide transverse energy value w.r.t. z-axis.
1116// By default the value is returned in the units as it was stored in the track
1117// structure. However, the user can select a different energy unit scale by
1118// specification of the scale parameter.
1119// The convention is that scale=1 corresponds to GeV, so specification
1120// of scale=0.001 will provide the transverse energy in MeV.
d071d629 1121// The error on the value can be obtained by GetResultError()
1122// after invokation of GetEt().
25eefd00 1123
d071d629 1124 Double_t et=GetScaTrans();
25eefd00 1125 if (scale>0)
1126 {
1127 et*=fEscale/scale;
1128 fDresult*=fEscale/scale;
1129 }
d071d629 1130
1131 return et;
1132}
1133///////////////////////////////////////////////////////////////////////////
25eefd00 1134Double_t AliTrack::GetEl(Float_t scale)
d071d629 1135{
25eefd00 1136// Provide longitudinal energy value w.r.t. z-axis.
1137// By default the value is returned in the units as it was stored in the track
1138// structure. However, the user can select a different energy unit scale by
1139// specification of the scale parameter.
1140// The convention is that scale=1 corresponds to GeV, so specification
1141// of scale=0.001 will provide the longitudinal energy in MeV.
8adaf597 1142// Note : the returned value can also be negative.
d071d629 1143// The error on the value can be obtained by GetResultError()
1144// after invokation of GetEl().
25eefd00 1145
d071d629 1146 Double_t el=GetScaLong();
25eefd00 1147 if (scale>0)
1148 {
1149 el*=fEscale/scale;
1150 fDresult*=fEscale/scale;
1151 }
d071d629 1152
1153 return el;
1154}
1155///////////////////////////////////////////////////////////////////////////
25eefd00 1156Double_t AliTrack::GetMt(Float_t scale)
d071d629 1157{
1158// Provide transverse mass value w.r.t. z-axis.
25eefd00 1159// By default the value is returned in the units as it was stored in the track
1160// structure. However, the user can select a different energy unit scale by
1161// specification of the scale parameter.
1162// The convention is that scale=1 corresponds to GeV, so specification
1163// of scale=0.001 will provide the transverse mass in MeV.
d071d629 1164// The error on the value can be obtained by GetResultError()
1165// after invokation of GetMt().
1166 Double_t pt=GetPt();
1167 Double_t dpt=GetResultError();
1168 Double_t m=GetMass();
1169 Double_t dm=GetResultError();
1170
1171 Double_t mt=sqrt(pt*pt+m*m);
1172 Double_t dmt2=0;
1173 if (mt) dmt2=(pow((pt*dpt),2)+pow((m*dm),2))/(mt*mt);
1174
1175 fDresult=sqrt(dmt2);
25eefd00 1176 if (scale>0)
1177 {
1178 mt*=fEscale/scale;
1179 fDresult*=fEscale/scale;
1180 }
d071d629 1181 return mt;
1182}
1183///////////////////////////////////////////////////////////////////////////
8adaf597 1184Double_t AliTrack::GetRapidity()
1185{
1186// Provide rapidity value w.r.t. z-axis.
1187// The error on the value can be obtained by GetResultError()
1188// after invokation of GetRapidity().
1189// Note : Also GetPseudoRapidity() is available since this class is
1190// derived from Ali4Vector.
1191 Double_t e=GetEnergy();
1192 Double_t de=GetResultError();
1193 Double_t pl=GetPl();
1194 Double_t dpl=GetResultError();
1195 Double_t sum=e+pl;
1196 Double_t dif=e-pl;
1197
1198 Double_t y=9999,dy2=0;
1199 if (sum && dif) y=0.5*log(sum/dif);
1200
1201 if (sum*dif) dy2=(1./(sum*dif))*(pow((pl*de),2)+pow((e*dpl),2));
1202
1203 fDresult=sqrt(dy2);
1204 return y;
1205}
1206///////////////////////////////////////////////////////////////////////////
c72198f1 1207void AliTrack::SetImpactPoint(AliPosition& p,TString q)
43bfa5be 1208{
1209// Store the position of the impact-point in the plane "q=0".
1210// Here q denotes one of the axes X, Y or Z.
1211// Note : The character to denote the axis may be entered in lower or
1212// in uppercase.
1213 Int_t axis=0;
1214 if (q=="x" || q=="X") axis=1;
1215 if (q=="y" || q=="Y") axis=2;
1216 if (q=="z" || q=="Z") axis=3;
1217
1218 switch (axis)
1219 {
1220 case 1: // Impact-point in the plane X=0
f4d1f676 1221 if (fImpactYZ) delete fImpactYZ;
1222 fImpactYZ=new AliPositionObj(p);
43bfa5be 1223 break;
1224
1225 case 2: // Impact-point in the plane Y=0
f4d1f676 1226 if (fImpactXZ) delete fImpactXZ;
1227 fImpactXZ=new AliPositionObj(p);
43bfa5be 1228 break;
1229
1230 case 3: // Impact-point in the plane Z=0
f4d1f676 1231 if (fImpactXY) delete fImpactXY;
1232 fImpactXY=new AliPositionObj(p);
43bfa5be 1233 break;
1234
1235 default: // Unsupported axis
1236 cout << "*AliTrack::SetImpactPoint* Unsupported axis : " << q << endl
1237 << " Possible axes are 'X', 'Y' and 'Z'." << endl;
1238 break;
1239 }
1240}
1241///////////////////////////////////////////////////////////////////////////
fcf4326d 1242AliPosition* AliTrack::GetImpactPoint(TString q) const
43bfa5be 1243{
1244// Provide the position of the impact-point in the plane "q=0".
1245// Here q denotes one of the axes X, Y or Z.
1246// Note : The character to denote the axis may be entered in lower or
1247// in uppercase.
43bfa5be 1248 Int_t axis=0;
1249 if (q=="x" || q=="X") axis=1;
1250 if (q=="y" || q=="Y") axis=2;
1251 if (q=="z" || q=="Z") axis=3;
1252
1253 switch (axis)
1254 {
1255 case 1: // Impact-point in the plane X=0
1256 return fImpactYZ;
1257
1258 case 2: // Impact-point in the plane Y=0
1259 return fImpactXZ;
1260
1261 case 3: // Impact-point in the plane Z=0
1262 return fImpactXY;
1263
1264 default: // Unsupported axis
1265 cout << "*AliTrack::GetImpactPoint* Unsupported axis : " << q << endl
1266 << " Possible axes are 'X', 'Y' and 'Z'." << endl;
c72198f1 1267 return 0;
43bfa5be 1268 }
1269}
1270///////////////////////////////////////////////////////////////////////////
1271void AliTrack::SetId(Int_t id)
1272{
fdbea0ce 1273// Set a user defined unique identifier for this track.
43bfa5be 1274 fUserId=id;
1275}
1276///////////////////////////////////////////////////////////////////////////
261c0caf 1277Int_t AliTrack::GetId() const
43bfa5be 1278{
fdbea0ce 1279// Provide the user defined unique identifier of this track.
43bfa5be 1280 return fUserId;
1281}
1282///////////////////////////////////////////////////////////////////////////
c72198f1 1283void AliTrack::SetClosestPoint(AliPosition& p)
43bfa5be 1284{
1285// Set position p as the point of closest approach w.r.t. some reference
f4d1f676 1286 if (fClosest) delete fClosest;
1287 fClosest=new AliPositionObj(p);
43bfa5be 1288}
1289///////////////////////////////////////////////////////////////////////////
fcf4326d 1290AliPosition* AliTrack::GetClosestPoint() const
43bfa5be 1291{
1292// Provide the point of closest approach w.r.t. some reference
1293 return fClosest;
1294}
1295///////////////////////////////////////////////////////////////////////////
25eefd00 1296void AliTrack::SetEscale(Float_t scale)
2693cb4e 1297{
25eefd00 1298// Indicate the energy/momentum scale as used by the user.
1299// The convention is that scale=1 indicates values in units
1300// of GeV, GeV/c or GeV/c**2.
1301// So, in case one decides to store values in units of MeV, MeV/c or MeV/c**2
1302// the scale indicator should be set to scale=0.001.
1303//
1304// By default scale=1 is set in the constructor.
1305
1306 if (scale>0)
2693cb4e 1307 {
25eefd00 1308 fEscale=scale;
2693cb4e 1309 }
1310 else
1311 {
25eefd00 1312 cout << " *AliTrack::SetEscale* Invalid scale value : " << scale << endl;
2693cb4e 1313 }
1314}
1315///////////////////////////////////////////////////////////////////////////
25eefd00 1316Float_t AliTrack::GetEscale() const
2693cb4e 1317{
25eefd00 1318// Provide the energy/momentum scale as used by the user.
1319// The convention is that scale=1 indicates values in units
1320// of GeV, GeV/c or GeV/c**2.
1321// So, a value of scale=0.001 indicates that energy/momentum values are
1322// stored in units of MeV, MeV/c or MeV/c**2.
1323 return fEscale;
2693cb4e 1324}
1325///////////////////////////////////////////////////////////////////////////
fdbea0ce 1326void AliTrack::SetParticleCode(Int_t code)
1327{
1328// Set the user defined particle id code (e.g. the PDF convention).
1329 fCode=code;
1330}
1331///////////////////////////////////////////////////////////////////////////
261c0caf 1332Int_t AliTrack::GetParticleCode() const
fdbea0ce 1333{
1334// Provide the user defined particle id code.
1335 return fCode;
1336}
1337///////////////////////////////////////////////////////////////////////////
fcf4326d 1338void AliTrack::SetParentTrack(AliTrack * const t)
1fbffa23 1339{
1340// Set pointer to the parent track.
1341 fParent=t;
1342}
1343///////////////////////////////////////////////////////////////////////////
fcf4326d 1344AliTrack* AliTrack::GetParentTrack() const
1fbffa23 1345{
1346// Provide pointer to the parent track.
1347 return fParent;
1348}
1349///////////////////////////////////////////////////////////////////////////
5f25234b 1350void AliTrack::SetProb(Double_t prob)
1351{
1352// Set hypothesis probability for this track.
1353 fProb=prob;
1354}
1355///////////////////////////////////////////////////////////////////////////
261c0caf 1356Float_t AliTrack::GetProb() const
5f25234b 1357{
1358// Provide the hypothesis probability for this track.
1359 return fProb;
1360}
1361///////////////////////////////////////////////////////////////////////////
fcf4326d 1362void AliTrack::SetFitDetails(const TObject* obj)
ea0b5b7f 1363{
1364// Enter the object containing the fit details.
1365// In case an object to hold fit details was already present, this
1366// will be deleted first before the new one is stored.
1367// This means that SetFitDetails(0) can be used to just remove the
1368// existing object with the fit details.
1369// All objects derived from TObject can be entered in this way.
1370// Obvious candidates for objects containing detailed fit information
1371// are functions (e.g. TF1) and histograms (e.g. TH1F).
1372// However, using an AliDevice object provides a very versatile facility
1373// to store the parameters of various fit procedures.
1374// In such a case the AliDevice can be used to provide the various fit
1375// definitions and the corresponding fit parameters can be entered as
1376// separate AliSignal objects which are stored as hits to the AliDevice.
1377// In addition various functions and histograms can be linked to the
1378// various AliSignal instances
1379// The latter procedure is based on the original idea of Adam Bouchta.
1380//
1381// Note : The entered object is owned by this AliTrack instance.
1382// As such, a private copy of obj will be stored using the Clone()
1383// memberfunction.
1384// In case the entered object contains pointers to other objects,
1385// the user has to provide the appropriate Clone() memberfunction
1386// for the class to which the entered object belongs.
1387// An example can be seen from AliTrack::Clone().
1388//
1389 if (fFit)
1390 {
1391 delete fFit;
1392 fFit=0;
1393 }
1394
1395 if (obj) fFit=obj->Clone();
1396}
1397///////////////////////////////////////////////////////////////////////////
fcf4326d 1398TObject* AliTrack::GetFitDetails() const
ea0b5b7f 1399{
1400// Provide the pointer to the object containing the fit details.
1401 return fFit;
1402}
1403///////////////////////////////////////////////////////////////////////////
a7dc0627 1404void AliTrack::SetTimestamp(AliTimestamp& t)
1405{
1406// Store the timestamp for this track.
1407 if (fTstamp) delete fTstamp;
1408 fTstamp=new AliTimestamp(t);
1409}
1410///////////////////////////////////////////////////////////////////////////
fcf4326d 1411AliTimestamp* AliTrack::GetTimestamp() const
a7dc0627 1412{
1413// Provide the timestamp of this track.
1414 return fTstamp;
1415}
1416///////////////////////////////////////////////////////////////////////////
1417void AliTrack::RemoveTimestamp()
1418{
1419// Remove the timestamp from this track.
1420 if (fTstamp)
1421 {
1422 delete fTstamp;
1423 fTstamp=0;
1424 }
1425}
1426///////////////////////////////////////////////////////////////////////////
fcf4326d 1427Double_t AliTrack::GetDistance(AliPosition* const p,Float_t scale)
1c96d8dc 1428{
1429// Provide distance of the current track to the position p.
1430// The error on the result can be obtained as usual by invoking
1431// GetResultError() afterwards.
1432//
25eefd00 1433// By default the distance will be provided in the metric unit scale of
1434// the AliPosition p.
1435// However, the user can select a different metric unit scale by
1436// specification of the scale parameter.
1437// The convention is that scale=1 corresponds to meter, so specification
1438// of scale=0.01 will provide the distance in cm.
1c96d8dc 1439// As such it is possible to obtain a correctly computed distance even in case
1440// the track parameters have a different unit scale.
1441// However, it is recommended to work always with one single unit scale.
1442//
1443// Note : In case of incomplete information, a distance value of -1 is
1444// returned.
1445
1446 Double_t dist=-1.;
1447 fDresult=0.;
1448
1449 if (!p) return dist;
1450
1451 // Obtain a defined position on this track
1452 AliPosition* rx=fRef;
1453 if (!rx) rx=fBegin;
1454 if (!rx) rx=fEnd;
1455
1456 if (!rx) return dist;
1457
9427ac75 1458 Ali3Vector p1=Get3Momentum();
1459
1460 if (p1.GetNorm() <= 0.) return dist;
1461
1c96d8dc 1462 Ali3Vector r0=(Ali3Vector)(*rx);
1463
1464 Float_t tscale=rx->GetUnitScale();
1465 Float_t pscale=p->GetUnitScale();
1466 if ((tscale/pscale > 1.1) || (pscale/tscale > 1.1)) r0=r0*(tscale/pscale);
1467
1468 // Obtain the direction unit vector of this track
1469 Double_t vec[3];
1470 Double_t err[3];
1c96d8dc 1471 p1.GetVector(vec,"sph");
1472 p1.GetErrors(err,"sph");
1473 vec[0]=1.;
1474 err[0]=0.;
1475 p1.SetVector(vec,"sph");
1476 p1.SetErrors(err,"sph");
1477
1478 Ali3Vector q=(Ali3Vector)(*p);
1479 Ali3Vector r=q-r0;
1480 Ali3Vector d=r.Cross(p1);
1481 dist=d.GetNorm();
1482 fDresult=d.GetResultError();
25eefd00 1483 if (scale>0)
1484 {
1485 dist*=pscale/scale;
1486 fDresult*=pscale/scale;
1487 }
1c96d8dc 1488 return dist;
1489}
1490///////////////////////////////////////////////////////////////////////////
fcf4326d 1491Double_t AliTrack::GetDistance(AliTrack* const t,Float_t scale)
9427ac75 1492{
1493// Provide distance of the current track to the track t.
1494// The error on the result can be obtained as usual by invoking
1495// GetResultError() afterwards.
1496//
25eefd00 1497// By default the distance will be provided in the metric unit scale of
1498// the current track.
1499// This implies that the results of t1.GetDistance(t2) and t2.GetDistance(t1)
1500// may be numerically different in case t1 and t2 have different metric units.
1501// However, the user can specify a required metric unit scale by specification
1502// of the scale parameter.
1503// The convention is that scale=1 corresponds to meter, so specification
1504// of scale=0.01 will provide the distance in cm.
9427ac75 1505// As such it is possible to obtain a correctly computed distance even in case
1506// the track parameters have a different unit scale.
9427ac75 1507// However, it is recommended to work always with one single unit scale.
1508//
1509// Note : In case of incomplete information, a distance value of -1 is
1510// returned.
1511
1512 Double_t dist=-1.;
1513 fDresult=0.;
1514
1515 if (!t) return dist;
1516
1517 // Obtain a defined position on this track
1518 AliPosition* rx=fRef;
1519 if (!rx) rx=fBegin;
1520 if (!rx) rx=fEnd;
1521
1522 if (!rx) return dist;
1523
1524 // Obtain a defined position on track t
1525 AliPosition* ry=t->GetReferencePoint();
1526 if (!ry) ry=t->GetBeginPoint();
1527 if (!ry) ry=t->GetEndPoint();
1528
1529 if (!ry) return dist;
1530
1531 Ali3Vector p1=Get3Momentum();
1532 Ali3Vector p2=t->Get3Momentum();
1533
1534 if (p1.GetNorm() <= 0. || p2.GetNorm() <= 0.) return dist;
1535
1536 // The vector normal to both track directions
1537 Ali3Vector n=p1.Cross(p2);
1538
25eefd00 1539 Float_t scalex=rx->GetUnitScale();
1540 Float_t scaley=ry->GetUnitScale();
1541
9427ac75 1542 if (n.GetNorm() > 1.e-10)
1543 {
1544 // Normalise n to a unit vector
1545 Double_t vec[3];
1546 Double_t err[3];
1547 n.GetVector(vec,"sph");
1548 n.GetErrors(err,"sph");
1549 vec[0]=1.;
1550 err[0]=0.;
1551 n.SetVector(vec,"sph");
1552 n.SetErrors(err,"sph");
1553 Ali3Vector r1=(Ali3Vector)(*rx);
1554 Ali3Vector r2=(Ali3Vector)(*ry);
1555 // Correct components of r2 in case of different unit scales
25eefd00 1556 if ((scaley/scalex > 1.1) || (scalex/scaley > 1.1)) r2=r2*(scaley/scalex);
9427ac75 1557 Ali3Vector r=r1-r2;
1558 dist=fabs(r.Dot(n));
1559 fDresult=r.GetResultError();
1560 }
1561 else // Parallel tracks
1562 {
1563 dist=t->GetDistance(rx);
1564 fDresult=t->GetResultError();
1565 }
25eefd00 1566
1567 if (scale>0)
1568 {
1569 dist*=scalex/scale;
1570 fDresult*=scalex/scale;
1571 }
9427ac75 1572 return dist;
1573}
1574///////////////////////////////////////////////////////////////////////////
261c0caf 1575TObject* AliTrack::Clone(const char* name) const
5f25234b 1576{
1577// Make a deep copy of the current object and provide the pointer to the copy.
1578// This memberfunction enables automatic creation of new objects of the
1579// correct type depending on the object type, a feature which may be very useful
1580// for containers when adding objects in case the container owns the objects.
1581// This feature allows e.g. AliJet to store either AliTrack objects or
1582// objects derived from AliTrack via the AddTrack memberfunction, provided
1583// these derived classes also have a proper Clone memberfunction.
1584
1585 AliTrack* trk=new AliTrack(*this);
1586 if (name)
1587 {
1588 if (strlen(name)) trk->SetName(name);
1589 }
1590 return trk;
1591}
1592///////////////////////////////////////////////////////////////////////////