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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 | // | |
39 | // t1.Info(); | |
40 | // t2.Info(); | |
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(); | |
139 | fNdec=t.GetNdecay(); | |
140 | fNsig=t.GetNsignals(); | |
141 | fNmasses=t.GetNMassHypotheses(); | |
142 | Set4Momentum((Ali4Vector&)t); | |
143 | fBegin=t.GetBeginPoint(); | |
144 | fEnd=t.GetEndPoint(); | |
145 | fImpactXY=t.GetImpactPoint("z"); | |
146 | fImpactXZ=t.GetImpactPoint("y"); | |
147 | fImpactYZ=t.GetImpactPoint("x"); | |
148 | fClosest=t.GetClosestPoint(); | |
149 | ||
150 | AliTrack* tx; | |
151 | if (fNdec) | |
152 | { | |
153 | fDecays=new TObjArray(fNdec); | |
154 | fDecays->SetOwner(); | |
155 | for (Int_t it=1; it<=fNdec; it++) | |
156 | { | |
157 | tx=t.GetDecayTrack(it); | |
158 | fDecays->Add(new AliTrack(*tx)); | |
159 | } | |
160 | } | |
161 | ||
162 | AliSignal* sx; | |
163 | if (fNsig) | |
164 | { | |
165 | fSignals=new TObjArray(fNsig); | |
166 | for (Int_t is=1; is<=fNsig; is++) | |
167 | { | |
168 | sx=t.GetSignal(is); | |
169 | fSignals->Add(sx); | |
170 | } | |
171 | } | |
172 | ||
173 | Double_t prob,m,dm; | |
174 | if (fNmasses) | |
175 | { | |
176 | fMasses=new TArrayD(fNmasses); | |
177 | fDmasses=new TArrayD(fNmasses); | |
178 | fPmasses=new TArrayD(fNmasses); | |
179 | for (Int_t ih=1; ih<=fNmasses; ih++) | |
180 | { | |
181 | prob=t.GetMassHypothesisProb(ih); | |
182 | m=t.GetMassHypothesis(ih); | |
183 | dm=t.GetResultError(); | |
184 | fMasses->AddAt(m,ih-1); | |
185 | fDmasses->AddAt(dm,ih-1); | |
186 | fPmasses->AddAt(prob,ih-1); | |
187 | } | |
188 | } | |
189 | } | |
190 | /////////////////////////////////////////////////////////////////////////// | |
d88f97cc | 191 | void AliTrack::Reset() |
192 | { | |
35044448 | 193 | // Reset all variables to 0 and delete all auto-generated decay tracks. |
d88f97cc | 194 | fQ=0; |
2693cb4e | 195 | fChi2=0; |
196 | fNdf=0; | |
43bfa5be | 197 | fUserId=0; |
d88f97cc | 198 | fNdec=0; |
959fbac5 | 199 | fNsig=0; |
f531a546 | 200 | fNmasses=0; |
d88f97cc | 201 | Double_t a[4]={0,0,0,0}; |
202 | SetVector(a,"sph"); | |
203 | if (fDecays) | |
204 | { | |
d88f97cc | 205 | delete fDecays; |
206 | fDecays=0; | |
207 | } | |
959fbac5 | 208 | if (fSignals) |
209 | { | |
210 | fSignals->Clear(); | |
211 | delete fSignals; | |
212 | fSignals=0; | |
213 | } | |
214 | Double_t b[3]={0,0,0}; | |
215 | fBegin.SetPosition(b,"sph"); | |
216 | fEnd.SetPosition(b,"sph"); | |
43bfa5be | 217 | fImpactXY.SetPosition(b,"sph"); |
218 | fImpactXZ.SetPosition(b,"sph"); | |
219 | fImpactYZ.SetPosition(b,"sph"); | |
220 | fClosest.SetPosition(b,"sph"); | |
f531a546 | 221 | if (fMasses) |
222 | { | |
223 | delete fMasses; | |
224 | fMasses=0; | |
225 | } | |
226 | if (fDmasses) | |
227 | { | |
228 | delete fDmasses; | |
229 | fDmasses=0; | |
230 | } | |
231 | if (fPmasses) | |
232 | { | |
233 | delete fPmasses; | |
234 | fPmasses=0; | |
235 | } | |
d88f97cc | 236 | } |
237 | /////////////////////////////////////////////////////////////////////////// | |
238 | void AliTrack::Set3Momentum(Ali3Vector& p) | |
239 | { | |
240 | // Set the track parameters according to the 3-momentum p | |
959fbac5 | 241 | Set3Vector(p); |
d88f97cc | 242 | } |
243 | /////////////////////////////////////////////////////////////////////////// | |
244 | void AliTrack::Set4Momentum(Ali4Vector& p) | |
245 | { | |
246 | // Set the track parameters according to the 4-momentum p | |
247 | Double_t E=p.GetScalar(); | |
959fbac5 | 248 | Double_t dE=p.GetResultError(); |
d88f97cc | 249 | Ali3Vector pv=p.Get3Vector(); |
250 | SetVector(E,pv); | |
959fbac5 | 251 | SetScalarError(dE); |
d88f97cc | 252 | } |
253 | /////////////////////////////////////////////////////////////////////////// | |
959fbac5 | 254 | void AliTrack::SetMass(Double_t m,Double_t dm) |
d88f97cc | 255 | { |
256 | // Set the particle mass | |
959fbac5 | 257 | // The default value for the error dm is 0. |
258 | Double_t inv=pow(m,2); | |
259 | Double_t dinv=fabs(2.*m*dm); | |
260 | SetInvariant(inv,dinv); | |
d88f97cc | 261 | } |
262 | /////////////////////////////////////////////////////////////////////////// | |
263 | void AliTrack::SetCharge(Float_t q) | |
264 | { | |
265 | // Set the particle charge | |
266 | fQ=q; | |
267 | } | |
268 | /////////////////////////////////////////////////////////////////////////// | |
269 | void AliTrack::Info(TString f) | |
270 | { | |
271 | // Provide track information within the coordinate frame f | |
959fbac5 | 272 | Double_t m=GetMass(); |
273 | Double_t dm=GetResultError(); | |
43bfa5be | 274 | cout << " *AliTrack::Info* Id : " << fUserId << " Mass : " << m |
959fbac5 | 275 | << " error : " << dm << " Charge : " << fQ |
f531a546 | 276 | << " Momentum : " << GetMomentum() << " Nmass hyp. : " << fNmasses |
277 | << " Ntracks : " << fNdec << " Nsignals : " << fNsig << endl; | |
278 | for (Int_t i=0; i<fNmasses; i++) | |
279 | { | |
280 | cout << " Mass hypothesis " << (i+1) << " Mass : " << fMasses->At(i) | |
281 | << " error : " << fDmasses->At(i) << " prob. : " << fPmasses->At(i) | |
282 | << endl; | |
283 | } | |
d88f97cc | 284 | Ali4Vector::Info(f); |
285 | } | |
286 | /////////////////////////////////////////////////////////////////////////// | |
287 | void AliTrack::List(TString f) | |
288 | { | |
289 | // Provide current track and decay level 1 information within coordinate frame f | |
290 | ||
291 | Info(f); // Information of the current track | |
292 | ||
293 | // Decay products of this track | |
294 | AliTrack* td; | |
295 | for (Int_t id=1; id<=fNdec; id++) | |
296 | { | |
297 | td=GetDecayTrack(id); | |
298 | if (td) | |
299 | { | |
300 | cout << " ---Level 1 sec. track no. " << id << endl; | |
d88f97cc | 301 | td->Info(f); |
302 | } | |
303 | else | |
304 | { | |
305 | cout << " *AliTrack::List* Error : No decay track present." << endl; | |
306 | } | |
307 | } | |
308 | } | |
309 | /////////////////////////////////////////////////////////////////////////// | |
310 | void AliTrack::ListAll(TString f) | |
311 | { | |
312 | // Provide complete track and decay information within the coordinate frame f | |
313 | ||
314 | Info(f); // Information of the current track | |
959fbac5 | 315 | cout << " Begin-point :"; fBegin.Info(f); |
316 | cout << " End-point :"; fEnd.Info(f); | |
317 | for (Int_t is=1; is<=GetNsignals(); is++) | |
318 | { | |
319 | ((AliSignal*)GetSignal(is))->Info(f); | |
320 | } | |
d88f97cc | 321 | |
322 | AliTrack* t=this; | |
323 | Dump(t,1,f); // Information of all decay products | |
324 | } | |
325 | ////////////////////////////////////////////////////////////////////////// | |
326 | void AliTrack::Dump(AliTrack* t,Int_t n,TString f) | |
327 | { | |
328 | // Recursively provide the info of all decay levels of this track | |
329 | AliTrack* td; | |
330 | for (Int_t id=1; id<=t->GetNdecay(); id++) | |
331 | { | |
332 | td=t->GetDecayTrack(id); | |
333 | if (td) | |
334 | { | |
335 | cout << " ---Level " << n << " sec. track no. " << id << endl; | |
d88f97cc | 336 | td->Info(f); |
959fbac5 | 337 | for (Int_t is=1; is<=td->GetNsignals(); is++) |
338 | { | |
339 | ((AliSignal*)td->GetSignal(is))->Info(f); | |
340 | } | |
d88f97cc | 341 | |
342 | // Go for next decay level of this decay track recursively | |
343 | Dump(td,n+1,f); | |
344 | } | |
345 | else | |
346 | { | |
347 | cout << " *AliTrack::Dump* Error : No decay track present." << endl; | |
348 | } | |
349 | } | |
350 | } | |
351 | ////////////////////////////////////////////////////////////////////////// | |
352 | Double_t AliTrack::GetMomentum() | |
353 | { | |
959fbac5 | 354 | // Provide the value of the track 3-momentum. |
355 | // The error can be obtained by invoking GetResultError() after | |
356 | // invokation of GetMomentum(). | |
959fbac5 | 357 | Double_t norm=fV.GetNorm(); |
d071d629 | 358 | fDresult=fV.GetResultError(); |
959fbac5 | 359 | return norm; |
d88f97cc | 360 | } |
361 | /////////////////////////////////////////////////////////////////////////// | |
362 | Ali3Vector AliTrack::Get3Momentum() | |
363 | { | |
364 | // Provide the track 3-momentum | |
365 | return (Ali3Vector)Get3Vector(); | |
366 | } | |
367 | /////////////////////////////////////////////////////////////////////////// | |
368 | Double_t AliTrack::GetMass() | |
369 | { | |
959fbac5 | 370 | // Provide the particle mass. |
371 | // The error can be obtained by invoking GetResultError() after | |
372 | // invokation of GetMass(). | |
373 | Double_t inv=GetInvariant(); | |
374 | Double_t dinv=GetResultError(); | |
375 | Double_t dm=0; | |
376 | if (inv >= 0) | |
377 | { | |
378 | Double_t m=sqrt(inv); | |
379 | if (m) dm=dinv/(2.*m); | |
380 | fDresult=dm; | |
381 | return m; | |
382 | } | |
383 | else | |
384 | { | |
385 | cout << "*AliTrack::GetMass* Unphysical situation m**2 = " << inv << endl; | |
386 | cout << " Value 0 will be returned." << endl; | |
387 | fDresult=dm; | |
388 | return 0; | |
389 | } | |
d88f97cc | 390 | } |
391 | /////////////////////////////////////////////////////////////////////////// | |
392 | Float_t AliTrack::GetCharge() | |
393 | { | |
394 | // Provide the particle charge | |
395 | return fQ; | |
396 | } | |
397 | /////////////////////////////////////////////////////////////////////////// | |
398 | Double_t AliTrack::GetEnergy() | |
399 | { | |
959fbac5 | 400 | // Provide the particle's energy. |
401 | // The error can be obtained by invoking GetResultError() after | |
402 | // invokation of GetEnergy(). | |
403 | Double_t E=GetScalar(); | |
404 | if (E>0) | |
405 | { | |
406 | return E; | |
407 | } | |
408 | else | |
409 | { | |
410 | cout << "*AliTrack::GetEnergy* Unphysical situation E = " << E << endl; | |
411 | cout << " Value 0 will be returned." << endl; | |
412 | return 0; | |
413 | } | |
d88f97cc | 414 | } |
415 | /////////////////////////////////////////////////////////////////////////// | |
416 | void AliTrack::Decay(Double_t m1,Double_t m2,Double_t thcms,Double_t phicms) | |
417 | { | |
418 | // Perform 2-body decay of current track | |
419 | // m1 : mass of decay product 1 | |
420 | // m2 : mass of decay product 2 | |
421 | // thcms : cms theta decay angle (in rad.) of m1 | |
422 | // phicms : cms phi decay angle (in rad.) of m1 | |
423 | ||
424 | fNdec=2; // it's a 2-body decay | |
959fbac5 | 425 | |
426 | Double_t M=GetMass(); | |
d88f97cc | 427 | |
428 | // Compute the 4-momenta of the decay products in the cms | |
429 | // Note : p2=p1=pnorm for a 2-body decay | |
959fbac5 | 430 | Double_t e1=0; |
431 | if (M) e1=((M*M)+(m1*m1)-(m2*m2))/(2.*M); | |
432 | Double_t e2=0; | |
433 | if (M) e2=((M*M)+(m2*m2)-(m1*m1))/(2.*M); | |
d88f97cc | 434 | Double_t pnorm=(e1*e1)-(m1*m1); |
435 | if (pnorm>0.) | |
436 | { | |
437 | pnorm=sqrt(pnorm); | |
438 | } | |
439 | else | |
440 | { | |
441 | pnorm=0; | |
442 | } | |
443 | ||
444 | Double_t a[3]; | |
445 | a[0]=pnorm; | |
446 | a[1]=thcms; | |
447 | a[2]=phicms; | |
448 | Ali3Vector p; | |
449 | p.SetVector(a,"sph"); | |
450 | ||
451 | Ali4Vector pprim1; | |
452 | pprim1.SetVector(e1,p); | |
959fbac5 | 453 | pprim1.SetInvariant(m1*m1); |
d88f97cc | 454 | |
455 | Ali4Vector pprim2; | |
456 | p*=-1; | |
457 | pprim2.SetVector(e2,p); | |
959fbac5 | 458 | pprim2.SetInvariant(m2*m2); |
d88f97cc | 459 | |
460 | // Determine boost parameters from the parent particle | |
959fbac5 | 461 | Double_t E=GetEnergy(); |
d88f97cc | 462 | p=Get3Vector(); |
463 | Ali4Vector pmu; | |
464 | pmu.SetVector(E,p); | |
465 | ||
466 | AliBoost q; | |
467 | q.Set4Momentum(pmu); | |
468 | ||
469 | Ali4Vector p1=q.Inverse(pprim1); // Boost decay product 1 | |
470 | Ali4Vector p2=q.Inverse(pprim2); // Boost decay product 2 | |
471 | ||
472 | // Enter the boosted data into the decay tracks array | |
473 | if (fDecays) | |
474 | { | |
d88f97cc | 475 | delete fDecays; |
6516b62d | 476 | fDecays=0; |
d88f97cc | 477 | } |
478 | fDecays=new TObjArray(); | |
6516b62d | 479 | fDecays->SetOwner(); |
d88f97cc | 480 | |
481 | fDecays->Add(new AliTrack); | |
482 | ((AliTrack*)fDecays->At(0))->Set4Momentum(p1); | |
959fbac5 | 483 | ((AliTrack*)fDecays->At(0))->SetMass(m1); |
d88f97cc | 484 | fDecays->Add(new AliTrack); |
485 | ((AliTrack*)fDecays->At(1))->Set4Momentum(p2); | |
d88f97cc | 486 | ((AliTrack*)fDecays->At(1))->SetMass(m2); |
487 | } | |
488 | /////////////////////////////////////////////////////////////////////////// | |
489 | Int_t AliTrack::GetNdecay() | |
490 | { | |
491 | // Provide the number of decay produced tracks | |
492 | return fNdec; | |
493 | } | |
494 | /////////////////////////////////////////////////////////////////////////// | |
495 | AliTrack* AliTrack::GetDecayTrack(Int_t j) | |
496 | { | |
497 | // Provide decay produced track number j | |
498 | // Note : j=1 denotes the first decay track | |
6516b62d | 499 | if (!fDecays) |
d88f97cc | 500 | { |
6516b62d | 501 | cout << " *AliTrack::GetDecayTrack* No tracks present." << endl; |
502 | return 0; | |
d88f97cc | 503 | } |
504 | else | |
505 | { | |
6516b62d | 506 | if ((j >= 1) && (j <= fNdec)) |
507 | { | |
508 | return (AliTrack*)fDecays->At(j-1); | |
509 | } | |
510 | else | |
511 | { | |
512 | cout << " *AliTrack* decay track number : " << j << " out of range." | |
513 | << " Ndec = " << fNdec << endl; | |
514 | return 0; | |
515 | } | |
d88f97cc | 516 | } |
517 | } | |
518 | /////////////////////////////////////////////////////////////////////////// | |
959fbac5 | 519 | void AliTrack::AddSignal(AliSignal& s) |
520 | { | |
521 | // Relate an AliSignal object to this track. | |
522 | if (!fSignals) fSignals=new TObjArray(); | |
523 | fNsig++; | |
524 | fSignals->Add(&s); | |
525 | } | |
526 | /////////////////////////////////////////////////////////////////////////// | |
527 | void AliTrack::RemoveSignal(AliSignal& s) | |
528 | { | |
529 | // Remove related AliSignal object to this track. | |
530 | if (fSignals) | |
531 | { | |
532 | AliSignal* test=(AliSignal*)fSignals->Remove(&s); | |
533 | if (test) | |
534 | { | |
535 | fNsig--; | |
536 | fSignals->Compress(); | |
537 | } | |
538 | } | |
539 | } | |
540 | /////////////////////////////////////////////////////////////////////////// | |
541 | Int_t AliTrack::GetNsignals() | |
542 | { | |
543 | // Provide the number of related AliSignals. | |
544 | return fNsig; | |
545 | } | |
546 | /////////////////////////////////////////////////////////////////////////// | |
547 | AliSignal* AliTrack::GetSignal(Int_t j) | |
548 | { | |
549 | // Provide the related AliSignal number j. | |
550 | // Note : j=1 denotes the first signal. | |
6516b62d | 551 | if (!fSignals) |
959fbac5 | 552 | { |
6516b62d | 553 | cout << " *AliTrack::GetSignal* No signals present." << endl; |
554 | return 0; | |
959fbac5 | 555 | } |
556 | else | |
557 | { | |
6516b62d | 558 | if ((j >= 1) && (j <= fNsig)) |
559 | { | |
560 | return (AliSignal*)fSignals->At(j-1); | |
561 | } | |
562 | else | |
563 | { | |
564 | cout << " *AliTrack* signal number : " << j << " out of range." | |
565 | << " Nsig = " << fNsig << endl; | |
566 | return 0; | |
567 | } | |
959fbac5 | 568 | } |
569 | } | |
570 | /////////////////////////////////////////////////////////////////////////// | |
571 | void AliTrack::SetBeginPoint(AliPosition p) | |
572 | { | |
573 | // Store the position of the track begin-point. | |
574 | fBegin=p; | |
575 | } | |
576 | /////////////////////////////////////////////////////////////////////////// | |
577 | AliPosition AliTrack::GetBeginPoint() | |
578 | { | |
579 | // Provide the position of the track begin-point. | |
580 | return fBegin; | |
581 | } | |
582 | /////////////////////////////////////////////////////////////////////////// | |
583 | void AliTrack::SetEndPoint(AliPosition p) | |
584 | { | |
585 | // Store the position of the track end-point. | |
586 | fEnd=p; | |
587 | } | |
588 | /////////////////////////////////////////////////////////////////////////// | |
589 | AliPosition AliTrack::GetEndPoint() | |
590 | { | |
591 | // Provide the position of the track end-point. | |
592 | return fEnd; | |
593 | } | |
594 | /////////////////////////////////////////////////////////////////////////// | |
f531a546 | 595 | void AliTrack::AddMassHypothesis(Double_t prob,Double_t m,Double_t dm) |
596 | { | |
597 | // Add a mass hypothesis for this current track. | |
598 | // prob=probalility m=mass value dm=error on the mass value. | |
599 | // The default value for the mass error dm is 0. | |
600 | if (!fMasses) fMasses=new TArrayD(); | |
601 | if (!fDmasses) fDmasses=new TArrayD(); | |
602 | if (!fPmasses) fPmasses=new TArrayD(); | |
603 | ||
604 | fNmasses++; | |
605 | fMasses->Set(fNmasses); | |
606 | fDmasses->Set(fNmasses); | |
607 | fPmasses->Set(fNmasses); | |
608 | ||
609 | fMasses->AddAt(m,fNmasses-1); | |
610 | fDmasses->AddAt(dm,fNmasses-1); | |
611 | fPmasses->AddAt(prob,fNmasses-1); | |
612 | } | |
613 | /////////////////////////////////////////////////////////////////////////// | |
614 | Int_t AliTrack::GetNMassHypotheses() | |
615 | { | |
616 | // Provide the number of mass hypotheses for this track. | |
617 | return fNmasses; | |
618 | } | |
619 | /////////////////////////////////////////////////////////////////////////// | |
620 | Double_t AliTrack::GetMassHypothesis(Int_t j) | |
621 | { | |
622 | // Provide the mass of the jth hypothesis for this track. | |
623 | // Note : the first hypothesis is indicated by j=1. | |
624 | // Default : j=0 ==> Hypothesis with highest probability. | |
625 | // The error on the mass can be obtained by invoking GetResultError() | |
626 | // after invokation of GetMassHypothesis(j). | |
627 | ||
628 | Double_t m=0,dm=0,prob=0; | |
629 | ||
630 | // Check validity of index j | |
631 | if (j<0 || j>fNmasses) | |
632 | { | |
633 | cout << " *AliTrack::GetMassHypothesis* Invalid index j : " << j | |
634 | << " Number of mass hypotheses : " << fNmasses << endl; | |
635 | fDresult=0; | |
636 | return 0; | |
637 | } | |
638 | ||
639 | // Select mass hypothesis with highest probability | |
640 | if (j==0) | |
641 | { | |
642 | if (fNmasses) | |
643 | { | |
644 | m=fMasses->At(0); | |
645 | dm=fDmasses->At(0); | |
646 | prob=fPmasses->At(0); | |
647 | for (Int_t i=1; i<fNmasses; i++) | |
648 | { | |
649 | if (fPmasses->At(i)>prob) | |
650 | { | |
651 | m=fMasses->At(i); | |
652 | dm=fDmasses->At(i); | |
653 | } | |
654 | } | |
655 | } | |
656 | fDresult=dm; | |
657 | return m; | |
658 | } | |
659 | ||
660 | // Provide data of requested mass hypothesis | |
661 | m=fMasses->At(j-1); | |
662 | fDresult=fDmasses->At(j-1); | |
663 | return m; | |
664 | } | |
665 | /////////////////////////////////////////////////////////////////////////// | |
666 | Double_t AliTrack::GetMassHypothesisProb(Int_t j) | |
667 | { | |
668 | // Provide the probability of the jth hypothesis for this track. | |
669 | // Note : the first hypothesis is indicated by j=1. | |
670 | // Default : j=0 ==> Hypothesis with highest probability. | |
671 | ||
672 | Double_t prob=0; | |
673 | ||
674 | // Check validity of index j | |
675 | if (j<0 || j>fNmasses) | |
676 | { | |
677 | cout << " *AliTrack::GetMassHypothesisProb* Invalid index j : " << j | |
678 | << " Number of mass hypotheses : " << fNmasses << endl; | |
679 | return 0; | |
680 | } | |
681 | ||
682 | // Select mass hypothesis with highest probability | |
683 | if (j==0) | |
684 | { | |
685 | if (fNmasses) | |
686 | { | |
687 | prob=fPmasses->At(0); | |
688 | for (Int_t i=1; i<fNmasses; i++) | |
689 | { | |
690 | if (fPmasses->At(i)>prob) prob=fPmasses->At(i); | |
691 | } | |
692 | } | |
693 | return prob; | |
694 | } | |
695 | ||
696 | // Provide probability of requested mass hypothesis | |
697 | prob=fPmasses->At(j-1); | |
698 | return prob; | |
699 | } | |
700 | /////////////////////////////////////////////////////////////////////////// | |
701 | void AliTrack::SetMass() | |
702 | { | |
703 | // Set the mass and error to the value of the hypothesis with highest prob. | |
704 | ||
705 | Double_t m=0,dm=0,prob=0; | |
706 | ||
707 | // Select mass hypothesis with highest probability | |
708 | if (fNmasses) | |
709 | { | |
710 | m=fMasses->At(0); | |
711 | dm=fDmasses->At(0); | |
712 | prob=fPmasses->At(0); | |
713 | for (Int_t i=1; i<fNmasses; i++) | |
714 | { | |
715 | if (fPmasses->At(i)>prob) | |
716 | { | |
717 | m=fMasses->At(i); | |
718 | dm=fDmasses->At(i); | |
719 | } | |
720 | } | |
721 | SetMass(m,dm); | |
722 | } | |
723 | else | |
724 | { | |
725 | cout << " *AliTrack::SetMass()* No hypothesis present => No action." << endl; | |
726 | } | |
727 | } | |
728 | /////////////////////////////////////////////////////////////////////////// | |
729 | void AliTrack::RemoveMassHypothesis(Int_t j) | |
730 | { | |
731 | // Remove the jth mass hypothesis for this track. | |
732 | // Note : the first hypothesis is indicated by j=1. | |
733 | ||
734 | if (j<=0 || j>fNmasses) // Check validity of index j | |
735 | { | |
736 | cout << " *AliTrack::RemoveMassHypothesis* Invalid index j : " << j | |
737 | << " Number of mass hypotheses : " << fNmasses << endl; | |
738 | } | |
739 | else | |
740 | { | |
741 | if (j != fNmasses) | |
742 | { | |
743 | fMasses->AddAt(fMasses->At(fNmasses-1),j-1); | |
744 | fDmasses->AddAt(fDmasses->At(fNmasses-1),j-1); | |
745 | fPmasses->AddAt(fPmasses->At(fNmasses-1),j-1); | |
746 | } | |
747 | fMasses->AddAt(0,fNmasses-1); | |
748 | fDmasses->AddAt(0,fNmasses-1); | |
749 | fPmasses->AddAt(0,fNmasses-1); | |
750 | fNmasses--; | |
751 | fMasses->Set(fNmasses); | |
752 | fDmasses->Set(fNmasses); | |
753 | fPmasses->Set(fNmasses); | |
754 | } | |
755 | } | |
756 | /////////////////////////////////////////////////////////////////////////// | |
d071d629 | 757 | Double_t AliTrack::GetPt() |
758 | { | |
759 | // Provide trans. momentum value w.r.t. z-axis. | |
760 | // The error on the value can be obtained by GetResultError() | |
761 | // after invokation of GetPt(). | |
762 | Ali3Vector v; | |
763 | v=GetVecTrans(); | |
764 | Double_t norm=v.GetNorm(); | |
765 | fDresult=v.GetResultError(); | |
766 | ||
767 | return norm; | |
768 | } | |
769 | /////////////////////////////////////////////////////////////////////////// | |
770 | Double_t AliTrack::GetPl() | |
771 | { | |
772 | // Provide long. momentum value w.r.t. z-axis. | |
8adaf597 | 773 | // Note : the returned value can also be negative. |
d071d629 | 774 | // The error on the value can be obtained by GetResultError() |
775 | // after invokation of GetPl(). | |
776 | Ali3Vector v; | |
777 | v=GetVecLong(); | |
8adaf597 | 778 | |
779 | Double_t pl=v.GetNorm(); | |
d071d629 | 780 | fDresult=v.GetResultError(); |
781 | ||
8adaf597 | 782 | Double_t a[3]; |
783 | v.GetVector(a,"sph"); | |
784 | if (cos(a[1])<0) pl=-pl; | |
785 | ||
786 | return pl; | |
d071d629 | 787 | } |
788 | /////////////////////////////////////////////////////////////////////////// | |
789 | Double_t AliTrack::GetEt() | |
790 | { | |
791 | // Provide trans. energy value w.r.t. z-axis. | |
792 | // The error on the value can be obtained by GetResultError() | |
793 | // after invokation of GetEt(). | |
794 | Double_t et=GetScaTrans(); | |
795 | ||
796 | return et; | |
797 | } | |
798 | /////////////////////////////////////////////////////////////////////////// | |
799 | Double_t AliTrack::GetEl() | |
800 | { | |
801 | // Provide long. energy value w.r.t. z-axis. | |
8adaf597 | 802 | // Note : the returned value can also be negative. |
d071d629 | 803 | // The error on the value can be obtained by GetResultError() |
804 | // after invokation of GetEl(). | |
805 | Double_t el=GetScaLong(); | |
806 | ||
807 | return el; | |
808 | } | |
809 | /////////////////////////////////////////////////////////////////////////// | |
810 | Double_t AliTrack::GetMt() | |
811 | { | |
812 | // Provide transverse mass value w.r.t. z-axis. | |
813 | // The error on the value can be obtained by GetResultError() | |
814 | // after invokation of GetMt(). | |
815 | Double_t pt=GetPt(); | |
816 | Double_t dpt=GetResultError(); | |
817 | Double_t m=GetMass(); | |
818 | Double_t dm=GetResultError(); | |
819 | ||
820 | Double_t mt=sqrt(pt*pt+m*m); | |
821 | Double_t dmt2=0; | |
822 | if (mt) dmt2=(pow((pt*dpt),2)+pow((m*dm),2))/(mt*mt); | |
823 | ||
824 | fDresult=sqrt(dmt2); | |
825 | return mt; | |
826 | } | |
827 | /////////////////////////////////////////////////////////////////////////// | |
828 | Double_t AliTrack::GetMt(Int_t j) | |
829 | { | |
830 | // Provide transverse mass value w.r.t. z-axis and jth mass hypothesis. | |
831 | // Note : the first hypothesis is indicated by j=1. | |
832 | // j=0 ==> Hypothesis with highest probability. | |
833 | // The error on the value can be obtained by GetResultError() | |
834 | // after invokation of GetMt(j). | |
835 | Double_t pt=GetPt(); | |
836 | Double_t dpt=GetResultError(); | |
837 | Double_t m=GetMassHypothesis(j); | |
838 | Double_t dm=GetResultError(); | |
839 | ||
840 | Double_t mt=sqrt(pt*pt+m*m); | |
841 | Double_t dmt2=0; | |
842 | if (mt) dmt2=(pow((pt*dpt),2)+pow((m*dm),2))/(mt*mt); | |
843 | ||
844 | fDresult=sqrt(dmt2); | |
845 | return mt; | |
846 | } | |
847 | /////////////////////////////////////////////////////////////////////////// | |
8adaf597 | 848 | Double_t AliTrack::GetRapidity() |
849 | { | |
850 | // Provide rapidity value w.r.t. z-axis. | |
851 | // The error on the value can be obtained by GetResultError() | |
852 | // after invokation of GetRapidity(). | |
853 | // Note : Also GetPseudoRapidity() is available since this class is | |
854 | // derived from Ali4Vector. | |
855 | Double_t e=GetEnergy(); | |
856 | Double_t de=GetResultError(); | |
857 | Double_t pl=GetPl(); | |
858 | Double_t dpl=GetResultError(); | |
859 | Double_t sum=e+pl; | |
860 | Double_t dif=e-pl; | |
861 | ||
862 | Double_t y=9999,dy2=0; | |
863 | if (sum && dif) y=0.5*log(sum/dif); | |
864 | ||
865 | if (sum*dif) dy2=(1./(sum*dif))*(pow((pl*de),2)+pow((e*dpl),2)); | |
866 | ||
867 | fDresult=sqrt(dy2); | |
868 | return y; | |
869 | } | |
870 | /////////////////////////////////////////////////////////////////////////// | |
43bfa5be | 871 | void AliTrack::SetImpactPoint(AliPosition p,TString q) |
872 | { | |
873 | // Store the position of the impact-point in the plane "q=0". | |
874 | // Here q denotes one of the axes X, Y or Z. | |
875 | // Note : The character to denote the axis may be entered in lower or | |
876 | // in uppercase. | |
877 | Int_t axis=0; | |
878 | if (q=="x" || q=="X") axis=1; | |
879 | if (q=="y" || q=="Y") axis=2; | |
880 | if (q=="z" || q=="Z") axis=3; | |
881 | ||
882 | switch (axis) | |
883 | { | |
884 | case 1: // Impact-point in the plane X=0 | |
885 | fImpactYZ=p; | |
886 | break; | |
887 | ||
888 | case 2: // Impact-point in the plane Y=0 | |
889 | fImpactXZ=p; | |
890 | break; | |
891 | ||
892 | case 3: // Impact-point in the plane Z=0 | |
893 | fImpactXY=p; | |
894 | break; | |
895 | ||
896 | default: // Unsupported axis | |
897 | cout << "*AliTrack::SetImpactPoint* Unsupported axis : " << q << endl | |
898 | << " Possible axes are 'X', 'Y' and 'Z'." << endl; | |
899 | break; | |
900 | } | |
901 | } | |
902 | /////////////////////////////////////////////////////////////////////////// | |
903 | AliPosition AliTrack::GetImpactPoint(TString q) | |
904 | { | |
905 | // Provide the position of the impact-point in the plane "q=0". | |
906 | // Here q denotes one of the axes X, Y or Z. | |
907 | // Note : The character to denote the axis may be entered in lower or | |
908 | // in uppercase. | |
909 | AliPosition dummy; | |
910 | Int_t axis=0; | |
911 | if (q=="x" || q=="X") axis=1; | |
912 | if (q=="y" || q=="Y") axis=2; | |
913 | if (q=="z" || q=="Z") axis=3; | |
914 | ||
915 | switch (axis) | |
916 | { | |
917 | case 1: // Impact-point in the plane X=0 | |
918 | return fImpactYZ; | |
919 | ||
920 | case 2: // Impact-point in the plane Y=0 | |
921 | return fImpactXZ; | |
922 | ||
923 | case 3: // Impact-point in the plane Z=0 | |
924 | return fImpactXY; | |
925 | ||
926 | default: // Unsupported axis | |
927 | cout << "*AliTrack::GetImpactPoint* Unsupported axis : " << q << endl | |
928 | << " Possible axes are 'X', 'Y' and 'Z'." << endl; | |
929 | return dummy; | |
930 | } | |
931 | } | |
932 | /////////////////////////////////////////////////////////////////////////// | |
933 | void AliTrack::SetId(Int_t id) | |
934 | { | |
935 | // Set a user defined identifier for this track. | |
936 | fUserId=id; | |
937 | } | |
938 | /////////////////////////////////////////////////////////////////////////// | |
939 | Int_t AliTrack::GetId() | |
940 | { | |
941 | // Provide the user defined identifier of this track. | |
942 | return fUserId; | |
943 | } | |
944 | /////////////////////////////////////////////////////////////////////////// | |
945 | void AliTrack::SetClosestPoint(AliPosition p) | |
946 | { | |
947 | // Set position p as the point of closest approach w.r.t. some reference | |
948 | fClosest=p; | |
949 | } | |
950 | /////////////////////////////////////////////////////////////////////////// | |
951 | AliPosition AliTrack::GetClosestPoint() | |
952 | { | |
953 | // Provide the point of closest approach w.r.t. some reference | |
954 | return fClosest; | |
955 | } | |
956 | /////////////////////////////////////////////////////////////////////////// | |
2693cb4e | 957 | void AliTrack::SetChi2(Float_t chi2) |
958 | { | |
959 | // Set the chi-squared value of the track fit. | |
960 | if (chi2<0) | |
961 | { | |
962 | cout << " *AliTrack::SetChi2* Invalid chi2 value : " << chi2 << endl; | |
963 | } | |
964 | else | |
965 | { | |
966 | fChi2=chi2; | |
967 | } | |
968 | } | |
969 | /////////////////////////////////////////////////////////////////////////// | |
970 | void AliTrack::SetNdf(Int_t ndf) | |
971 | { | |
972 | // Set the number of degrees of freedom for the track fit. | |
973 | if (ndf<0) | |
974 | { | |
975 | cout << " *AliTrack::SetNdf* Invalid ndf value : " << ndf << endl; | |
976 | } | |
977 | else | |
978 | { | |
979 | fNdf=ndf; | |
980 | } | |
981 | } | |
982 | /////////////////////////////////////////////////////////////////////////// | |
983 | Float_t AliTrack::GetChi2() | |
984 | { | |
985 | // Provide the chi-squared value of the track fit. | |
986 | return fChi2; | |
987 | } | |
988 | /////////////////////////////////////////////////////////////////////////// | |
989 | Int_t AliTrack::GetNdf() | |
990 | { | |
991 | // Provide the number of degrees of freedom for the track fit. | |
992 | return fNdf; | |
993 | } | |
994 | /////////////////////////////////////////////////////////////////////////// |