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