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