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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" |
93 | ||
94 | ClassImp(AliTrack) // Class implementation to enable ROOT I/O | |
95 | ||
96 | AliTrack::AliTrack() | |
97 | { | |
98 | // Default constructor | |
99 | // All variables initialised to 0 | |
6516b62d | 100 | Init(); |
101 | Reset(); | |
102 | } | |
103 | /////////////////////////////////////////////////////////////////////////// | |
104 | void AliTrack::Init() | |
105 | { | |
106 | // Initialisation of pointers etc... | |
d88f97cc | 107 | fDecays=0; |
959fbac5 | 108 | fSignals=0; |
f531a546 | 109 | fMasses=0; |
110 | fDmasses=0; | |
111 | fPmasses=0; | |
d88f97cc | 112 | } |
113 | /////////////////////////////////////////////////////////////////////////// | |
114 | AliTrack::~AliTrack() | |
115 | { | |
116 | // Destructor to delete memory allocated for decay tracks array | |
117 | if (fDecays) | |
118 | { | |
d88f97cc | 119 | delete fDecays; |
120 | fDecays=0; | |
121 | } | |
959fbac5 | 122 | if (fSignals) |
123 | { | |
124 | fSignals->Clear(); | |
125 | delete fSignals; | |
126 | fSignals=0; | |
127 | } | |
d88f97cc | 128 | } |
129 | /////////////////////////////////////////////////////////////////////////// | |
6516b62d | 130 | AliTrack::AliTrack(AliTrack& t) |
131 | { | |
132 | // Copy constructor | |
133 | Init(); | |
134 | ||
135 | fQ=t.GetCharge(); | |
136 | fChi2=t.GetChi2(); | |
137 | fNdf=t.GetNdf(); | |
138 | fUserId=t.GetId(); | |
fdbea0ce | 139 | fCode=t.GetParticleCode(); |
6516b62d | 140 | fNdec=t.GetNdecay(); |
141 | fNsig=t.GetNsignals(); | |
142 | fNmasses=t.GetNMassHypotheses(); | |
143 | Set4Momentum((Ali4Vector&)t); | |
144 | fBegin=t.GetBeginPoint(); | |
145 | fEnd=t.GetEndPoint(); | |
146 | fImpactXY=t.GetImpactPoint("z"); | |
147 | fImpactXZ=t.GetImpactPoint("y"); | |
148 | fImpactYZ=t.GetImpactPoint("x"); | |
149 | fClosest=t.GetClosestPoint(); | |
150 | ||
151 | AliTrack* tx; | |
152 | if (fNdec) | |
153 | { | |
154 | fDecays=new TObjArray(fNdec); | |
155 | fDecays->SetOwner(); | |
156 | for (Int_t it=1; it<=fNdec; it++) | |
157 | { | |
158 | tx=t.GetDecayTrack(it); | |
159 | fDecays->Add(new AliTrack(*tx)); | |
160 | } | |
161 | } | |
162 | ||
163 | AliSignal* sx; | |
164 | if (fNsig) | |
165 | { | |
166 | fSignals=new TObjArray(fNsig); | |
167 | for (Int_t is=1; is<=fNsig; is++) | |
168 | { | |
169 | sx=t.GetSignal(is); | |
170 | fSignals->Add(sx); | |
171 | } | |
172 | } | |
173 | ||
174 | Double_t prob,m,dm; | |
175 | if (fNmasses) | |
176 | { | |
177 | fMasses=new TArrayD(fNmasses); | |
178 | fDmasses=new TArrayD(fNmasses); | |
179 | fPmasses=new TArrayD(fNmasses); | |
180 | for (Int_t ih=1; ih<=fNmasses; ih++) | |
181 | { | |
182 | prob=t.GetMassHypothesisProb(ih); | |
183 | m=t.GetMassHypothesis(ih); | |
184 | dm=t.GetResultError(); | |
185 | fMasses->AddAt(m,ih-1); | |
186 | fDmasses->AddAt(dm,ih-1); | |
187 | fPmasses->AddAt(prob,ih-1); | |
188 | } | |
189 | } | |
190 | } | |
191 | /////////////////////////////////////////////////////////////////////////// | |
d88f97cc | 192 | void AliTrack::Reset() |
193 | { | |
35044448 | 194 | // Reset all variables to 0 and delete all auto-generated decay tracks. |
d88f97cc | 195 | fQ=0; |
2693cb4e | 196 | fChi2=0; |
197 | fNdf=0; | |
43bfa5be | 198 | fUserId=0; |
fdbea0ce | 199 | fCode=0; |
d88f97cc | 200 | fNdec=0; |
959fbac5 | 201 | fNsig=0; |
f531a546 | 202 | fNmasses=0; |
d88f97cc | 203 | Double_t a[4]={0,0,0,0}; |
204 | SetVector(a,"sph"); | |
205 | if (fDecays) | |
206 | { | |
d88f97cc | 207 | delete fDecays; |
208 | fDecays=0; | |
209 | } | |
959fbac5 | 210 | if (fSignals) |
211 | { | |
212 | fSignals->Clear(); | |
213 | delete fSignals; | |
214 | fSignals=0; | |
215 | } | |
216 | Double_t b[3]={0,0,0}; | |
217 | fBegin.SetPosition(b,"sph"); | |
218 | fEnd.SetPosition(b,"sph"); | |
43bfa5be | 219 | fImpactXY.SetPosition(b,"sph"); |
220 | fImpactXZ.SetPosition(b,"sph"); | |
221 | fImpactYZ.SetPosition(b,"sph"); | |
222 | fClosest.SetPosition(b,"sph"); | |
f531a546 | 223 | if (fMasses) |
224 | { | |
225 | delete fMasses; | |
226 | fMasses=0; | |
227 | } | |
228 | if (fDmasses) | |
229 | { | |
230 | delete fDmasses; | |
231 | fDmasses=0; | |
232 | } | |
233 | if (fPmasses) | |
234 | { | |
235 | delete fPmasses; | |
236 | fPmasses=0; | |
237 | } | |
d88f97cc | 238 | } |
239 | /////////////////////////////////////////////////////////////////////////// | |
240 | void AliTrack::Set3Momentum(Ali3Vector& p) | |
241 | { | |
242 | // Set the track parameters according to the 3-momentum p | |
959fbac5 | 243 | Set3Vector(p); |
d88f97cc | 244 | } |
245 | /////////////////////////////////////////////////////////////////////////// | |
246 | void AliTrack::Set4Momentum(Ali4Vector& p) | |
247 | { | |
248 | // Set the track parameters according to the 4-momentum p | |
249 | Double_t E=p.GetScalar(); | |
959fbac5 | 250 | Double_t dE=p.GetResultError(); |
d88f97cc | 251 | Ali3Vector pv=p.Get3Vector(); |
252 | SetVector(E,pv); | |
959fbac5 | 253 | SetScalarError(dE); |
d88f97cc | 254 | } |
255 | /////////////////////////////////////////////////////////////////////////// | |
959fbac5 | 256 | void AliTrack::SetMass(Double_t m,Double_t dm) |
d88f97cc | 257 | { |
258 | // Set the particle mass | |
959fbac5 | 259 | // The default value for the error dm is 0. |
260 | Double_t inv=pow(m,2); | |
261 | Double_t dinv=fabs(2.*m*dm); | |
262 | SetInvariant(inv,dinv); | |
d88f97cc | 263 | } |
264 | /////////////////////////////////////////////////////////////////////////// | |
265 | void AliTrack::SetCharge(Float_t q) | |
266 | { | |
267 | // Set the particle charge | |
268 | fQ=q; | |
269 | } | |
270 | /////////////////////////////////////////////////////////////////////////// | |
84bb7c66 | 271 | void AliTrack::Data(TString f) |
d88f97cc | 272 | { |
273 | // Provide track information within the coordinate frame f | |
959fbac5 | 274 | Double_t m=GetMass(); |
275 | Double_t dm=GetResultError(); | |
84bb7c66 | 276 | cout << " *AliTrack::Data* Id : " << fUserId << " Code : " << fCode |
fdbea0ce | 277 | << " Mass : " << m << " error : " << dm << " Charge : " << fQ |
f531a546 | 278 | << " Momentum : " << GetMomentum() << " Nmass hyp. : " << fNmasses |
279 | << " Ntracks : " << fNdec << " Nsignals : " << fNsig << endl; | |
280 | for (Int_t i=0; i<fNmasses; i++) | |
281 | { | |
282 | cout << " Mass hypothesis " << (i+1) << " Mass : " << fMasses->At(i) | |
283 | << " error : " << fDmasses->At(i) << " prob. : " << fPmasses->At(i) | |
284 | << endl; | |
285 | } | |
84bb7c66 | 286 | Ali4Vector::Data(f); |
d88f97cc | 287 | } |
288 | /////////////////////////////////////////////////////////////////////////// | |
289 | void AliTrack::List(TString f) | |
290 | { | |
291 | // Provide current track and decay level 1 information within coordinate frame f | |
292 | ||
84bb7c66 | 293 | Data(f); // Information of the current track |
d88f97cc | 294 | |
295 | // Decay products of this track | |
296 | AliTrack* td; | |
297 | for (Int_t id=1; id<=fNdec; id++) | |
298 | { | |
299 | td=GetDecayTrack(id); | |
300 | if (td) | |
301 | { | |
302 | cout << " ---Level 1 sec. track no. " << id << endl; | |
84bb7c66 | 303 | td->Data(f); |
d88f97cc | 304 | } |
305 | else | |
306 | { | |
307 | cout << " *AliTrack::List* Error : No decay track present." << endl; | |
308 | } | |
309 | } | |
310 | } | |
311 | /////////////////////////////////////////////////////////////////////////// | |
312 | void AliTrack::ListAll(TString f) | |
313 | { | |
314 | // Provide complete track and decay information within the coordinate frame f | |
315 | ||
84bb7c66 | 316 | Data(f); // Information of the current track |
317 | cout << " Begin-point :"; fBegin.Data(f); | |
318 | cout << " End-point :"; fEnd.Data(f); | |
959fbac5 | 319 | for (Int_t is=1; is<=GetNsignals(); is++) |
320 | { | |
84bb7c66 | 321 | ((AliSignal*)GetSignal(is))->Data(f); |
959fbac5 | 322 | } |
d88f97cc | 323 | |
324 | AliTrack* t=this; | |
325 | Dump(t,1,f); // Information of all decay products | |
326 | } | |
327 | ////////////////////////////////////////////////////////////////////////// | |
328 | void AliTrack::Dump(AliTrack* t,Int_t n,TString f) | |
329 | { | |
330 | // Recursively provide the info of all decay levels of this track | |
331 | AliTrack* td; | |
332 | for (Int_t id=1; id<=t->GetNdecay(); id++) | |
333 | { | |
334 | td=t->GetDecayTrack(id); | |
335 | if (td) | |
336 | { | |
337 | cout << " ---Level " << n << " sec. track no. " << id << endl; | |
84bb7c66 | 338 | td->Data(f); |
959fbac5 | 339 | for (Int_t is=1; is<=td->GetNsignals(); is++) |
340 | { | |
84bb7c66 | 341 | ((AliSignal*)td->GetSignal(is))->Data(f); |
959fbac5 | 342 | } |
d88f97cc | 343 | |
344 | // Go for next decay level of this decay track recursively | |
345 | Dump(td,n+1,f); | |
346 | } | |
347 | else | |
348 | { | |
349 | cout << " *AliTrack::Dump* Error : No decay track present." << endl; | |
350 | } | |
351 | } | |
352 | } | |
353 | ////////////////////////////////////////////////////////////////////////// | |
354 | Double_t AliTrack::GetMomentum() | |
355 | { | |
959fbac5 | 356 | // Provide the value of the track 3-momentum. |
357 | // The error can be obtained by invoking GetResultError() after | |
358 | // invokation of GetMomentum(). | |
959fbac5 | 359 | Double_t norm=fV.GetNorm(); |
d071d629 | 360 | fDresult=fV.GetResultError(); |
959fbac5 | 361 | return norm; |
d88f97cc | 362 | } |
363 | /////////////////////////////////////////////////////////////////////////// | |
364 | Ali3Vector AliTrack::Get3Momentum() | |
365 | { | |
366 | // Provide the track 3-momentum | |
367 | return (Ali3Vector)Get3Vector(); | |
368 | } | |
369 | /////////////////////////////////////////////////////////////////////////// | |
370 | Double_t AliTrack::GetMass() | |
371 | { | |
959fbac5 | 372 | // Provide the particle mass. |
373 | // The error can be obtained by invoking GetResultError() after | |
374 | // invokation of GetMass(). | |
375 | Double_t inv=GetInvariant(); | |
376 | Double_t dinv=GetResultError(); | |
377 | Double_t dm=0; | |
378 | if (inv >= 0) | |
379 | { | |
380 | Double_t m=sqrt(inv); | |
381 | if (m) dm=dinv/(2.*m); | |
382 | fDresult=dm; | |
383 | return m; | |
384 | } | |
385 | else | |
386 | { | |
387 | cout << "*AliTrack::GetMass* Unphysical situation m**2 = " << inv << endl; | |
388 | cout << " Value 0 will be returned." << endl; | |
389 | fDresult=dm; | |
390 | return 0; | |
391 | } | |
d88f97cc | 392 | } |
393 | /////////////////////////////////////////////////////////////////////////// | |
394 | Float_t AliTrack::GetCharge() | |
395 | { | |
396 | // Provide the particle charge | |
397 | return fQ; | |
398 | } | |
399 | /////////////////////////////////////////////////////////////////////////// | |
400 | Double_t AliTrack::GetEnergy() | |
401 | { | |
959fbac5 | 402 | // Provide the particle's energy. |
403 | // The error can be obtained by invoking GetResultError() after | |
404 | // invokation of GetEnergy(). | |
405 | Double_t E=GetScalar(); | |
406 | if (E>0) | |
407 | { | |
408 | return E; | |
409 | } | |
410 | else | |
411 | { | |
412 | cout << "*AliTrack::GetEnergy* Unphysical situation E = " << E << endl; | |
413 | cout << " Value 0 will be returned." << endl; | |
414 | return 0; | |
415 | } | |
d88f97cc | 416 | } |
417 | /////////////////////////////////////////////////////////////////////////// | |
418 | void AliTrack::Decay(Double_t m1,Double_t m2,Double_t thcms,Double_t phicms) | |
419 | { | |
420 | // Perform 2-body decay of current track | |
421 | // m1 : mass of decay product 1 | |
422 | // m2 : mass of decay product 2 | |
423 | // thcms : cms theta decay angle (in rad.) of m1 | |
424 | // phicms : cms phi decay angle (in rad.) of m1 | |
425 | ||
426 | fNdec=2; // it's a 2-body decay | |
959fbac5 | 427 | |
428 | Double_t M=GetMass(); | |
d88f97cc | 429 | |
430 | // Compute the 4-momenta of the decay products in the cms | |
431 | // Note : p2=p1=pnorm for a 2-body decay | |
959fbac5 | 432 | Double_t e1=0; |
433 | if (M) e1=((M*M)+(m1*m1)-(m2*m2))/(2.*M); | |
434 | Double_t e2=0; | |
435 | if (M) e2=((M*M)+(m2*m2)-(m1*m1))/(2.*M); | |
d88f97cc | 436 | Double_t pnorm=(e1*e1)-(m1*m1); |
437 | if (pnorm>0.) | |
438 | { | |
439 | pnorm=sqrt(pnorm); | |
440 | } | |
441 | else | |
442 | { | |
443 | pnorm=0; | |
444 | } | |
445 | ||
446 | Double_t a[3]; | |
447 | a[0]=pnorm; | |
448 | a[1]=thcms; | |
449 | a[2]=phicms; | |
450 | Ali3Vector p; | |
451 | p.SetVector(a,"sph"); | |
452 | ||
453 | Ali4Vector pprim1; | |
454 | pprim1.SetVector(e1,p); | |
959fbac5 | 455 | pprim1.SetInvariant(m1*m1); |
d88f97cc | 456 | |
457 | Ali4Vector pprim2; | |
458 | p*=-1; | |
459 | pprim2.SetVector(e2,p); | |
959fbac5 | 460 | pprim2.SetInvariant(m2*m2); |
d88f97cc | 461 | |
462 | // Determine boost parameters from the parent particle | |
959fbac5 | 463 | Double_t E=GetEnergy(); |
d88f97cc | 464 | p=Get3Vector(); |
465 | Ali4Vector pmu; | |
466 | pmu.SetVector(E,p); | |
467 | ||
468 | AliBoost q; | |
469 | q.Set4Momentum(pmu); | |
470 | ||
471 | Ali4Vector p1=q.Inverse(pprim1); // Boost decay product 1 | |
472 | Ali4Vector p2=q.Inverse(pprim2); // Boost decay product 2 | |
473 | ||
474 | // Enter the boosted data into the decay tracks array | |
475 | if (fDecays) | |
476 | { | |
d88f97cc | 477 | delete fDecays; |
6516b62d | 478 | fDecays=0; |
d88f97cc | 479 | } |
480 | fDecays=new TObjArray(); | |
6516b62d | 481 | fDecays->SetOwner(); |
d88f97cc | 482 | |
483 | fDecays->Add(new AliTrack); | |
484 | ((AliTrack*)fDecays->At(0))->Set4Momentum(p1); | |
959fbac5 | 485 | ((AliTrack*)fDecays->At(0))->SetMass(m1); |
d88f97cc | 486 | fDecays->Add(new AliTrack); |
487 | ((AliTrack*)fDecays->At(1))->Set4Momentum(p2); | |
d88f97cc | 488 | ((AliTrack*)fDecays->At(1))->SetMass(m2); |
489 | } | |
490 | /////////////////////////////////////////////////////////////////////////// | |
491 | Int_t AliTrack::GetNdecay() | |
492 | { | |
493 | // Provide the number of decay produced tracks | |
494 | return fNdec; | |
495 | } | |
496 | /////////////////////////////////////////////////////////////////////////// | |
497 | AliTrack* AliTrack::GetDecayTrack(Int_t j) | |
498 | { | |
499 | // Provide decay produced track number j | |
500 | // Note : j=1 denotes the first decay track | |
6516b62d | 501 | if (!fDecays) |
d88f97cc | 502 | { |
6516b62d | 503 | cout << " *AliTrack::GetDecayTrack* No tracks present." << endl; |
504 | return 0; | |
d88f97cc | 505 | } |
506 | else | |
507 | { | |
6516b62d | 508 | if ((j >= 1) && (j <= fNdec)) |
509 | { | |
510 | return (AliTrack*)fDecays->At(j-1); | |
511 | } | |
512 | else | |
513 | { | |
514 | cout << " *AliTrack* decay track number : " << j << " out of range." | |
515 | << " Ndec = " << fNdec << endl; | |
516 | return 0; | |
517 | } | |
d88f97cc | 518 | } |
519 | } | |
520 | /////////////////////////////////////////////////////////////////////////// | |
959fbac5 | 521 | void AliTrack::AddSignal(AliSignal& s) |
522 | { | |
523 | // Relate an AliSignal object to this track. | |
524 | if (!fSignals) fSignals=new TObjArray(); | |
525 | fNsig++; | |
526 | fSignals->Add(&s); | |
527 | } | |
528 | /////////////////////////////////////////////////////////////////////////// | |
529 | void AliTrack::RemoveSignal(AliSignal& s) | |
530 | { | |
531 | // Remove related AliSignal object to this track. | |
532 | if (fSignals) | |
533 | { | |
534 | AliSignal* test=(AliSignal*)fSignals->Remove(&s); | |
535 | if (test) | |
536 | { | |
537 | fNsig--; | |
538 | fSignals->Compress(); | |
539 | } | |
540 | } | |
541 | } | |
542 | /////////////////////////////////////////////////////////////////////////// | |
543 | Int_t AliTrack::GetNsignals() | |
544 | { | |
545 | // Provide the number of related AliSignals. | |
546 | return fNsig; | |
547 | } | |
548 | /////////////////////////////////////////////////////////////////////////// | |
549 | AliSignal* AliTrack::GetSignal(Int_t j) | |
550 | { | |
551 | // Provide the related AliSignal number j. | |
552 | // Note : j=1 denotes the first signal. | |
6516b62d | 553 | if (!fSignals) |
959fbac5 | 554 | { |
6516b62d | 555 | cout << " *AliTrack::GetSignal* No signals present." << endl; |
556 | return 0; | |
959fbac5 | 557 | } |
558 | else | |
559 | { | |
6516b62d | 560 | if ((j >= 1) && (j <= fNsig)) |
561 | { | |
562 | return (AliSignal*)fSignals->At(j-1); | |
563 | } | |
564 | else | |
565 | { | |
566 | cout << " *AliTrack* signal number : " << j << " out of range." | |
567 | << " Nsig = " << fNsig << endl; | |
568 | return 0; | |
569 | } | |
959fbac5 | 570 | } |
571 | } | |
572 | /////////////////////////////////////////////////////////////////////////// | |
573 | void AliTrack::SetBeginPoint(AliPosition p) | |
574 | { | |
575 | // Store the position of the track begin-point. | |
576 | fBegin=p; | |
577 | } | |
578 | /////////////////////////////////////////////////////////////////////////// | |
579 | AliPosition AliTrack::GetBeginPoint() | |
580 | { | |
581 | // Provide the position of the track begin-point. | |
582 | return fBegin; | |
583 | } | |
584 | /////////////////////////////////////////////////////////////////////////// | |
585 | void AliTrack::SetEndPoint(AliPosition p) | |
586 | { | |
587 | // Store the position of the track end-point. | |
588 | fEnd=p; | |
589 | } | |
590 | /////////////////////////////////////////////////////////////////////////// | |
591 | AliPosition AliTrack::GetEndPoint() | |
592 | { | |
593 | // Provide the position of the track end-point. | |
594 | return fEnd; | |
595 | } | |
596 | /////////////////////////////////////////////////////////////////////////// | |
f531a546 | 597 | void AliTrack::AddMassHypothesis(Double_t prob,Double_t m,Double_t dm) |
598 | { | |
599 | // Add a mass hypothesis for this current track. | |
600 | // prob=probalility m=mass value dm=error on the mass value. | |
601 | // The default value for the mass error dm is 0. | |
602 | if (!fMasses) fMasses=new TArrayD(); | |
603 | if (!fDmasses) fDmasses=new TArrayD(); | |
604 | if (!fPmasses) fPmasses=new TArrayD(); | |
605 | ||
606 | fNmasses++; | |
607 | fMasses->Set(fNmasses); | |
608 | fDmasses->Set(fNmasses); | |
609 | fPmasses->Set(fNmasses); | |
610 | ||
611 | fMasses->AddAt(m,fNmasses-1); | |
612 | fDmasses->AddAt(dm,fNmasses-1); | |
613 | fPmasses->AddAt(prob,fNmasses-1); | |
614 | } | |
615 | /////////////////////////////////////////////////////////////////////////// | |
616 | Int_t AliTrack::GetNMassHypotheses() | |
617 | { | |
618 | // Provide the number of mass hypotheses for this track. | |
619 | return fNmasses; | |
620 | } | |
621 | /////////////////////////////////////////////////////////////////////////// | |
622 | Double_t AliTrack::GetMassHypothesis(Int_t j) | |
623 | { | |
624 | // Provide the mass of the jth hypothesis for this track. | |
625 | // Note : the first hypothesis is indicated by j=1. | |
626 | // Default : j=0 ==> Hypothesis with highest probability. | |
627 | // The error on the mass can be obtained by invoking GetResultError() | |
628 | // after invokation of GetMassHypothesis(j). | |
629 | ||
630 | Double_t m=0,dm=0,prob=0; | |
631 | ||
632 | // Check validity of index j | |
633 | if (j<0 || j>fNmasses) | |
634 | { | |
635 | cout << " *AliTrack::GetMassHypothesis* Invalid index j : " << j | |
636 | << " Number of mass hypotheses : " << fNmasses << endl; | |
637 | fDresult=0; | |
638 | return 0; | |
639 | } | |
640 | ||
641 | // Select mass hypothesis with highest probability | |
642 | if (j==0) | |
643 | { | |
644 | if (fNmasses) | |
645 | { | |
646 | m=fMasses->At(0); | |
647 | dm=fDmasses->At(0); | |
648 | prob=fPmasses->At(0); | |
649 | for (Int_t i=1; i<fNmasses; i++) | |
650 | { | |
651 | if (fPmasses->At(i)>prob) | |
652 | { | |
653 | m=fMasses->At(i); | |
654 | dm=fDmasses->At(i); | |
655 | } | |
656 | } | |
657 | } | |
658 | fDresult=dm; | |
659 | return m; | |
660 | } | |
661 | ||
662 | // Provide data of requested mass hypothesis | |
663 | m=fMasses->At(j-1); | |
664 | fDresult=fDmasses->At(j-1); | |
665 | return m; | |
666 | } | |
667 | /////////////////////////////////////////////////////////////////////////// | |
668 | Double_t AliTrack::GetMassHypothesisProb(Int_t j) | |
669 | { | |
670 | // Provide the probability of the jth hypothesis for this track. | |
671 | // Note : the first hypothesis is indicated by j=1. | |
672 | // Default : j=0 ==> Hypothesis with highest probability. | |
673 | ||
674 | Double_t prob=0; | |
675 | ||
676 | // Check validity of index j | |
677 | if (j<0 || j>fNmasses) | |
678 | { | |
679 | cout << " *AliTrack::GetMassHypothesisProb* Invalid index j : " << j | |
680 | << " Number of mass hypotheses : " << fNmasses << endl; | |
681 | return 0; | |
682 | } | |
683 | ||
684 | // Select mass hypothesis with highest probability | |
685 | if (j==0) | |
686 | { | |
687 | if (fNmasses) | |
688 | { | |
689 | prob=fPmasses->At(0); | |
690 | for (Int_t i=1; i<fNmasses; i++) | |
691 | { | |
692 | if (fPmasses->At(i)>prob) prob=fPmasses->At(i); | |
693 | } | |
694 | } | |
695 | return prob; | |
696 | } | |
697 | ||
698 | // Provide probability of requested mass hypothesis | |
699 | prob=fPmasses->At(j-1); | |
700 | return prob; | |
701 | } | |
702 | /////////////////////////////////////////////////////////////////////////// | |
703 | void AliTrack::SetMass() | |
704 | { | |
705 | // Set the mass and error to the value of the hypothesis with highest prob. | |
706 | ||
707 | Double_t m=0,dm=0,prob=0; | |
708 | ||
709 | // Select mass hypothesis with highest probability | |
710 | if (fNmasses) | |
711 | { | |
712 | m=fMasses->At(0); | |
713 | dm=fDmasses->At(0); | |
714 | prob=fPmasses->At(0); | |
715 | for (Int_t i=1; i<fNmasses; i++) | |
716 | { | |
717 | if (fPmasses->At(i)>prob) | |
718 | { | |
719 | m=fMasses->At(i); | |
720 | dm=fDmasses->At(i); | |
721 | } | |
722 | } | |
723 | SetMass(m,dm); | |
724 | } | |
725 | else | |
726 | { | |
727 | cout << " *AliTrack::SetMass()* No hypothesis present => No action." << endl; | |
728 | } | |
729 | } | |
730 | /////////////////////////////////////////////////////////////////////////// | |
731 | void AliTrack::RemoveMassHypothesis(Int_t j) | |
732 | { | |
733 | // Remove the jth mass hypothesis for this track. | |
734 | // Note : the first hypothesis is indicated by j=1. | |
735 | ||
736 | if (j<=0 || j>fNmasses) // Check validity of index j | |
737 | { | |
738 | cout << " *AliTrack::RemoveMassHypothesis* Invalid index j : " << j | |
739 | << " Number of mass hypotheses : " << fNmasses << endl; | |
740 | } | |
741 | else | |
742 | { | |
743 | if (j != fNmasses) | |
744 | { | |
745 | fMasses->AddAt(fMasses->At(fNmasses-1),j-1); | |
746 | fDmasses->AddAt(fDmasses->At(fNmasses-1),j-1); | |
747 | fPmasses->AddAt(fPmasses->At(fNmasses-1),j-1); | |
748 | } | |
749 | fMasses->AddAt(0,fNmasses-1); | |
750 | fDmasses->AddAt(0,fNmasses-1); | |
751 | fPmasses->AddAt(0,fNmasses-1); | |
752 | fNmasses--; | |
753 | fMasses->Set(fNmasses); | |
754 | fDmasses->Set(fNmasses); | |
755 | fPmasses->Set(fNmasses); | |
756 | } | |
757 | } | |
758 | /////////////////////////////////////////////////////////////////////////// | |
d071d629 | 759 | Double_t AliTrack::GetPt() |
760 | { | |
761 | // Provide trans. momentum value w.r.t. z-axis. | |
762 | // The error on the value can be obtained by GetResultError() | |
763 | // after invokation of GetPt(). | |
764 | Ali3Vector v; | |
765 | v=GetVecTrans(); | |
766 | Double_t norm=v.GetNorm(); | |
767 | fDresult=v.GetResultError(); | |
768 | ||
769 | return norm; | |
770 | } | |
771 | /////////////////////////////////////////////////////////////////////////// | |
772 | Double_t AliTrack::GetPl() | |
773 | { | |
774 | // Provide long. momentum value w.r.t. z-axis. | |
8adaf597 | 775 | // Note : the returned value can also be negative. |
d071d629 | 776 | // The error on the value can be obtained by GetResultError() |
777 | // after invokation of GetPl(). | |
778 | Ali3Vector v; | |
779 | v=GetVecLong(); | |
8adaf597 | 780 | |
781 | Double_t pl=v.GetNorm(); | |
d071d629 | 782 | fDresult=v.GetResultError(); |
783 | ||
8adaf597 | 784 | Double_t a[3]; |
785 | v.GetVector(a,"sph"); | |
786 | if (cos(a[1])<0) pl=-pl; | |
787 | ||
788 | return pl; | |
d071d629 | 789 | } |
790 | /////////////////////////////////////////////////////////////////////////// | |
791 | Double_t AliTrack::GetEt() | |
792 | { | |
793 | // Provide trans. energy value w.r.t. z-axis. | |
794 | // The error on the value can be obtained by GetResultError() | |
795 | // after invokation of GetEt(). | |
796 | Double_t et=GetScaTrans(); | |
797 | ||
798 | return et; | |
799 | } | |
800 | /////////////////////////////////////////////////////////////////////////// | |
801 | Double_t AliTrack::GetEl() | |
802 | { | |
803 | // Provide long. energy value w.r.t. z-axis. | |
8adaf597 | 804 | // Note : the returned value can also be negative. |
d071d629 | 805 | // The error on the value can be obtained by GetResultError() |
806 | // after invokation of GetEl(). | |
807 | Double_t el=GetScaLong(); | |
808 | ||
809 | return el; | |
810 | } | |
811 | /////////////////////////////////////////////////////////////////////////// | |
812 | Double_t AliTrack::GetMt() | |
813 | { | |
814 | // Provide transverse mass value w.r.t. z-axis. | |
815 | // The error on the value can be obtained by GetResultError() | |
816 | // after invokation of GetMt(). | |
817 | Double_t pt=GetPt(); | |
818 | Double_t dpt=GetResultError(); | |
819 | Double_t m=GetMass(); | |
820 | Double_t dm=GetResultError(); | |
821 | ||
822 | Double_t mt=sqrt(pt*pt+m*m); | |
823 | Double_t dmt2=0; | |
824 | if (mt) dmt2=(pow((pt*dpt),2)+pow((m*dm),2))/(mt*mt); | |
825 | ||
826 | fDresult=sqrt(dmt2); | |
827 | return mt; | |
828 | } | |
829 | /////////////////////////////////////////////////////////////////////////// | |
830 | Double_t AliTrack::GetMt(Int_t j) | |
831 | { | |
832 | // Provide transverse mass value w.r.t. z-axis and jth mass hypothesis. | |
833 | // Note : the first hypothesis is indicated by j=1. | |
834 | // j=0 ==> Hypothesis with highest probability. | |
835 | // The error on the value can be obtained by GetResultError() | |
836 | // after invokation of GetMt(j). | |
837 | Double_t pt=GetPt(); | |
838 | Double_t dpt=GetResultError(); | |
839 | Double_t m=GetMassHypothesis(j); | |
840 | Double_t dm=GetResultError(); | |
841 | ||
842 | Double_t mt=sqrt(pt*pt+m*m); | |
843 | Double_t dmt2=0; | |
844 | if (mt) dmt2=(pow((pt*dpt),2)+pow((m*dm),2))/(mt*mt); | |
845 | ||
846 | fDresult=sqrt(dmt2); | |
847 | return mt; | |
848 | } | |
849 | /////////////////////////////////////////////////////////////////////////// | |
8adaf597 | 850 | Double_t AliTrack::GetRapidity() |
851 | { | |
852 | // Provide rapidity value w.r.t. z-axis. | |
853 | // The error on the value can be obtained by GetResultError() | |
854 | // after invokation of GetRapidity(). | |
855 | // Note : Also GetPseudoRapidity() is available since this class is | |
856 | // derived from Ali4Vector. | |
857 | Double_t e=GetEnergy(); | |
858 | Double_t de=GetResultError(); | |
859 | Double_t pl=GetPl(); | |
860 | Double_t dpl=GetResultError(); | |
861 | Double_t sum=e+pl; | |
862 | Double_t dif=e-pl; | |
863 | ||
864 | Double_t y=9999,dy2=0; | |
865 | if (sum && dif) y=0.5*log(sum/dif); | |
866 | ||
867 | if (sum*dif) dy2=(1./(sum*dif))*(pow((pl*de),2)+pow((e*dpl),2)); | |
868 | ||
869 | fDresult=sqrt(dy2); | |
870 | return y; | |
871 | } | |
872 | /////////////////////////////////////////////////////////////////////////// | |
43bfa5be | 873 | void AliTrack::SetImpactPoint(AliPosition p,TString q) |
874 | { | |
875 | // Store the position of the impact-point in the plane "q=0". | |
876 | // Here q denotes one of the axes X, Y or Z. | |
877 | // Note : The character to denote the axis may be entered in lower or | |
878 | // in uppercase. | |
879 | Int_t axis=0; | |
880 | if (q=="x" || q=="X") axis=1; | |
881 | if (q=="y" || q=="Y") axis=2; | |
882 | if (q=="z" || q=="Z") axis=3; | |
883 | ||
884 | switch (axis) | |
885 | { | |
886 | case 1: // Impact-point in the plane X=0 | |
887 | fImpactYZ=p; | |
888 | break; | |
889 | ||
890 | case 2: // Impact-point in the plane Y=0 | |
891 | fImpactXZ=p; | |
892 | break; | |
893 | ||
894 | case 3: // Impact-point in the plane Z=0 | |
895 | fImpactXY=p; | |
896 | break; | |
897 | ||
898 | default: // Unsupported axis | |
899 | cout << "*AliTrack::SetImpactPoint* Unsupported axis : " << q << endl | |
900 | << " Possible axes are 'X', 'Y' and 'Z'." << endl; | |
901 | break; | |
902 | } | |
903 | } | |
904 | /////////////////////////////////////////////////////////////////////////// | |
905 | AliPosition AliTrack::GetImpactPoint(TString q) | |
906 | { | |
907 | // Provide the position of the impact-point in the plane "q=0". | |
908 | // Here q denotes one of the axes X, Y or Z. | |
909 | // Note : The character to denote the axis may be entered in lower or | |
910 | // in uppercase. | |
911 | AliPosition dummy; | |
912 | Int_t axis=0; | |
913 | if (q=="x" || q=="X") axis=1; | |
914 | if (q=="y" || q=="Y") axis=2; | |
915 | if (q=="z" || q=="Z") axis=3; | |
916 | ||
917 | switch (axis) | |
918 | { | |
919 | case 1: // Impact-point in the plane X=0 | |
920 | return fImpactYZ; | |
921 | ||
922 | case 2: // Impact-point in the plane Y=0 | |
923 | return fImpactXZ; | |
924 | ||
925 | case 3: // Impact-point in the plane Z=0 | |
926 | return fImpactXY; | |
927 | ||
928 | default: // Unsupported axis | |
929 | cout << "*AliTrack::GetImpactPoint* Unsupported axis : " << q << endl | |
930 | << " Possible axes are 'X', 'Y' and 'Z'." << endl; | |
931 | return dummy; | |
932 | } | |
933 | } | |
934 | /////////////////////////////////////////////////////////////////////////// | |
935 | void AliTrack::SetId(Int_t id) | |
936 | { | |
fdbea0ce | 937 | // Set a user defined unique identifier for this track. |
43bfa5be | 938 | fUserId=id; |
939 | } | |
940 | /////////////////////////////////////////////////////////////////////////// | |
941 | Int_t AliTrack::GetId() | |
942 | { | |
fdbea0ce | 943 | // Provide the user defined unique identifier of this track. |
43bfa5be | 944 | return fUserId; |
945 | } | |
946 | /////////////////////////////////////////////////////////////////////////// | |
947 | void AliTrack::SetClosestPoint(AliPosition p) | |
948 | { | |
949 | // Set position p as the point of closest approach w.r.t. some reference | |
950 | fClosest=p; | |
951 | } | |
952 | /////////////////////////////////////////////////////////////////////////// | |
953 | AliPosition AliTrack::GetClosestPoint() | |
954 | { | |
955 | // Provide the point of closest approach w.r.t. some reference | |
956 | return fClosest; | |
957 | } | |
958 | /////////////////////////////////////////////////////////////////////////// | |
2693cb4e | 959 | void AliTrack::SetChi2(Float_t chi2) |
960 | { | |
961 | // Set the chi-squared value of the track fit. | |
962 | if (chi2<0) | |
963 | { | |
964 | cout << " *AliTrack::SetChi2* Invalid chi2 value : " << chi2 << endl; | |
965 | } | |
966 | else | |
967 | { | |
968 | fChi2=chi2; | |
969 | } | |
970 | } | |
971 | /////////////////////////////////////////////////////////////////////////// | |
972 | void AliTrack::SetNdf(Int_t ndf) | |
973 | { | |
974 | // Set the number of degrees of freedom for the track fit. | |
975 | if (ndf<0) | |
976 | { | |
977 | cout << " *AliTrack::SetNdf* Invalid ndf value : " << ndf << endl; | |
978 | } | |
979 | else | |
980 | { | |
981 | fNdf=ndf; | |
982 | } | |
983 | } | |
984 | /////////////////////////////////////////////////////////////////////////// | |
985 | Float_t AliTrack::GetChi2() | |
986 | { | |
987 | // Provide the chi-squared value of the track fit. | |
988 | return fChi2; | |
989 | } | |
990 | /////////////////////////////////////////////////////////////////////////// | |
991 | Int_t AliTrack::GetNdf() | |
992 | { | |
993 | // Provide the number of degrees of freedom for the track fit. | |
994 | return fNdf; | |
995 | } | |
996 | /////////////////////////////////////////////////////////////////////////// | |
fdbea0ce | 997 | void AliTrack::SetParticleCode(Int_t code) |
998 | { | |
999 | // Set the user defined particle id code (e.g. the PDF convention). | |
1000 | fCode=code; | |
1001 | } | |
1002 | /////////////////////////////////////////////////////////////////////////// | |
1003 | Int_t AliTrack::GetParticleCode() | |
1004 | { | |
1005 | // Provide the user defined particle id code. | |
1006 | return fCode; | |
1007 | } | |
1008 | /////////////////////////////////////////////////////////////////////////// |