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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 | ||
16 | // $Id$ | |
17 | ||
18 | /////////////////////////////////////////////////////////////////////////// | |
19 | // Class AliJet | |
20 | // Creation and investigation of a jet of particle tracks. | |
21 | // An AliJet can be constructed by adding AliTracks. | |
22 | // | |
23 | // To provide maximal flexibility to the user, two modes of track storage | |
24 | // are provided by means of the memberfunction SetTrackCopy(). | |
25 | // | |
26 | // a) SetTrackCopy(0) (which is the default). | |
27 | // Only the pointers of the 'added' tracks are stored. | |
28 | // This mode is typically used by making jet studies based on a fixed list | |
29 | // of tracks which stays under user control or is contained for instance | |
30 | // in an AliEvent. | |
31 | // In this way the AliJet just represents a 'logical structure' for the | |
32 | // physics analysis which can be embedded in e.g. an AliEvent or AliVertex. | |
33 | // | |
34 | // Note : | |
35 | // Modifications made to the original tracks also affect the AliTrack objects | |
36 | // which are stored in the AliJet. | |
37 | // | |
38 | // b) SetTrackCopy(1). | |
39 | // Of every 'added' track a private copy will be made of which the pointer | |
40 | // will be stored. | |
41 | // In this way the AliJet represents an entity on its own and modifications | |
42 | // made to the original tracks do not affect the AliTrack objects which are | |
43 | // stored in the AliJet. | |
44 | // This mode will allow 'adding' many different AliTracks into an AliJet by | |
45 | // creating only one AliTrack instance in the main programme and using the | |
46 | // AliTrack::Reset() and AliTrack parameter setting memberfunctions. | |
47 | // | |
48 | // See also the documentation provided for the memberfunction SetOwner(). | |
49 | // | |
50 | // Coding example to make 2 jets j1 and j2. | |
51 | // ---------------------------------------- | |
52 | // j1 contains the AliTracks t1 and t2 | |
53 | // j2 contains 10 different AliTracks via tx | |
54 | // | |
55 | // AliTrack t1,t2; | |
56 | // ... | |
57 | // ... // code to fill the AliTrack data | |
58 | // ... | |
59 | // AliJet j1(); | |
60 | // j1.AddTrack(t1); | |
61 | // j1.AddTrack(t2); | |
62 | // | |
63 | // AliJet j2(); | |
64 | // j2.SetTrackCopy(1); | |
65 | // AliTrack* tx=new AliTrack(); | |
66 | // for (Int_t i=0; i<10; i++) | |
67 | // { | |
68 | // ... | |
69 | // ... // code to set momentum etc... of the track tx | |
70 | // ... | |
71 | // j2.AddTrack(tx); | |
72 | // tx->Reset(); | |
73 | // } | |
74 | // | |
75 | // j1.Data(); | |
76 | // j2.Data("sph"); | |
77 | // | |
78 | // Float_t e1=j1.GetEnergy(); | |
79 | // Float_t pnorm=j1->GetMomentum(); | |
80 | // Ali3Vector p=j1->Get3Momentum(); | |
81 | // Float_t m=j1.GetInvmass(); | |
82 | // Int_t ntk=j1.GetNtracks(); | |
83 | // AliTrack* tj=j1.GetTrack(1); | |
84 | // | |
85 | // delete tx; | |
86 | // | |
87 | // Note : All quantities are in GeV, GeV/c or GeV/c**2 | |
88 | // | |
89 | //--- Author: Nick van Eijndhoven 10-jul-1997 UU-SAP Utrecht | |
90 | //- Modified: NvE $Date$ UU-SAP Utrecht | |
91 | /////////////////////////////////////////////////////////////////////////// | |
92 | ||
93 | #include "AliJet.h" | |
94 | #include "Riostream.h" | |
95 | ||
96 | ClassImp(AliJet) // Class implementation to enable ROOT I/O | |
97 | ||
98 | AliJet::AliJet() : TObject(),Ali4Vector() | |
99 | { | |
100 | // Default constructor | |
101 | // All variables initialised to 0 | |
102 | // Initial maximum number of tracks is set to the default value | |
103 | Init(); | |
104 | Reset(); | |
105 | SetNtinit(); | |
106 | } | |
107 | /////////////////////////////////////////////////////////////////////////// | |
108 | void AliJet::Init() | |
109 | { | |
110 | // Initialisation of pointers etc... | |
111 | fTracks=0; | |
112 | fNtinit=0; | |
113 | fTrackCopy=0; | |
114 | } | |
115 | /////////////////////////////////////////////////////////////////////////// | |
116 | AliJet::AliJet(Int_t n) : TObject(),Ali4Vector() | |
117 | { | |
118 | // Create a jet to hold initially a maximum of n tracks | |
119 | // All variables initialised to 0 | |
120 | Init(); | |
121 | Reset(); | |
122 | if (n > 0) | |
123 | { | |
124 | SetNtinit(n); | |
125 | } | |
126 | else | |
127 | { | |
128 | cout << endl; | |
129 | cout << " *AliJet* Initial max. number of tracks entered : " << n << endl; | |
130 | cout << " This is invalid. Default initial maximum will be used." << endl; | |
131 | cout << endl; | |
132 | SetNtinit(); | |
133 | } | |
134 | } | |
135 | /////////////////////////////////////////////////////////////////////////// | |
136 | AliJet::~AliJet() | |
137 | { | |
138 | // Default destructor | |
139 | if (fTracks) | |
140 | { | |
141 | delete fTracks; | |
142 | fTracks=0; | |
143 | } | |
144 | } | |
145 | /////////////////////////////////////////////////////////////////////////// | |
146 | void AliJet::SetOwner(Bool_t own) | |
147 | { | |
148 | // Set ownership of all added objects. | |
149 | // The default parameter is own=kTRUE. | |
150 | // | |
151 | // Invokation of this memberfunction also sets all the copy modes | |
152 | // (e.g. TrackCopy & co.) according to the value of own. | |
153 | // | |
154 | // This function (with own=kTRUE) is particularly useful when reading data | |
155 | // from a tree/file, since Reset() will then actually remove all the | |
156 | // added objects from memory irrespective of the copy mode settings | |
157 | // during the tree/file creation process. In this way it provides a nice way | |
158 | // of preventing possible memory leaks in the reading/analysis process. | |
159 | // | |
160 | // In addition this memberfunction can also be used as a shortcut to set all | |
161 | // copy modes in one go during a tree/file creation process. | |
162 | // However, in this case the user has to take care to only set/change the | |
163 | // ownership (and copy mode) for empty objects (e.g. newly created objects | |
164 | // or after invokation of the Reset() memberfunction) otherwise it will | |
165 | // very likely result in inconsistent destructor behaviour. | |
166 | ||
167 | Int_t mode=1; | |
168 | if (!own) mode=0; | |
169 | if (fTracks) fTracks->SetOwner(own); | |
170 | fTrackCopy=mode; | |
171 | } | |
172 | /////////////////////////////////////////////////////////////////////////// | |
173 | AliJet::AliJet(AliJet& j) : TObject(j),Ali4Vector(j) | |
174 | { | |
175 | // Copy constructor | |
176 | fNtinit=j.fNtinit; | |
177 | fNtmax=j.fNtmax; | |
178 | fQ=j.fQ; | |
179 | fNtrk=j.fNtrk; | |
180 | fTrackCopy=j.fTrackCopy; | |
181 | fUserId=j.fUserId; | |
182 | ||
183 | fTracks=0; | |
184 | if (fNtrk) | |
185 | { | |
186 | fTracks=new TObjArray(fNtmax); | |
187 | if (fTrackCopy) fTracks->SetOwner(); | |
188 | } | |
189 | ||
190 | for (Int_t i=1; i<=fNtrk; i++) | |
191 | { | |
192 | AliTrack* tx=j.GetTrack(i); | |
193 | if (fTrackCopy) | |
194 | { | |
195 | fTracks->Add(new AliTrack(*tx)); | |
196 | } | |
197 | else | |
198 | { | |
199 | fTracks->Add(tx); | |
200 | } | |
201 | } | |
202 | } | |
203 | /////////////////////////////////////////////////////////////////////////// | |
204 | void AliJet::SetNtinit(Int_t n) | |
205 | { | |
206 | // Set the initial maximum number of tracks for this jet | |
207 | fNtinit=n; | |
208 | fNtmax=n; | |
209 | if (fTracks) | |
210 | { | |
211 | delete fTracks; | |
212 | fTracks=0; | |
213 | } | |
214 | } | |
215 | /////////////////////////////////////////////////////////////////////////// | |
216 | void AliJet::Reset() | |
217 | { | |
218 | // Reset all variables to 0 | |
219 | // The max. number of tracks is set to the initial value again | |
220 | fNtrk=0; | |
221 | fQ=0; | |
222 | fUserId=0; | |
223 | Double_t a[4]={0,0,0,0}; | |
224 | SetVector(a,"sph"); | |
225 | if (fNtinit > 0) SetNtinit(fNtinit); | |
226 | } | |
227 | /////////////////////////////////////////////////////////////////////////// | |
228 | void AliJet::AddTrack(AliTrack& t,Int_t copy) | |
229 | { | |
230 | // Add a track to the jet. | |
231 | // Note : The optional parameter "copy" is for internal use only. | |
232 | // In case the maximum number of tracks has been reached | |
233 | // space will be extended to hold an additional amount of tracks as | |
234 | // was initially reserved. | |
235 | if (!fTracks) | |
236 | { | |
237 | fTracks=new TObjArray(fNtmax); | |
238 | if (fTrackCopy) fTracks->SetOwner(); | |
239 | } | |
240 | if (fNtrk == fNtmax) // Check if maximum track number is reached | |
241 | { | |
242 | fNtmax+=fNtinit; | |
243 | fTracks->Expand(fNtmax); | |
244 | } | |
245 | ||
246 | // Add the track to this jet | |
247 | fNtrk++; | |
248 | if (fTrackCopy && copy) | |
249 | { | |
250 | fTracks->Add(new AliTrack(t)); | |
251 | } | |
252 | else | |
253 | { | |
254 | fTracks->Add(&t); | |
255 | } | |
256 | ||
257 | (*this)+=(Ali4Vector&)t; | |
258 | fQ+=t.GetCharge(); | |
259 | ||
260 | } | |
261 | /////////////////////////////////////////////////////////////////////////// | |
262 | void AliJet::Data(TString f) | |
263 | { | |
264 | // Provide jet information within the coordinate frame f | |
265 | cout << " *AliJet::Data* Id : " << fUserId << " Invmass : " << GetInvmass() << " Charge : " << fQ | |
266 | << " Momentum : " << GetMomentum() << " Ntracks : " << fNtrk << endl; | |
267 | ||
268 | Ali4Vector::Data(f); | |
269 | } | |
270 | /////////////////////////////////////////////////////////////////////////// | |
271 | void AliJet::List(TString f) | |
272 | { | |
273 | // Provide jet and primary track information within the coordinate frame f | |
274 | ||
275 | Data(f); // Information of the current jet | |
276 | ||
277 | // The tracks of this jet | |
278 | AliTrack* t; | |
279 | for (Int_t it=1; it<=fNtrk; it++) | |
280 | { | |
281 | t=GetTrack(it); | |
282 | if (t) | |
283 | { | |
284 | cout << " ---Track no. " << it << endl; | |
285 | cout << " "; | |
286 | t->Data(f); | |
287 | } | |
288 | else | |
289 | { | |
290 | cout << " *AliJet::List* Error : No track present." << endl; | |
291 | } | |
292 | } | |
293 | } | |
294 | /////////////////////////////////////////////////////////////////////////// | |
295 | void AliJet::ListAll(TString f) | |
296 | { | |
297 | // Provide jet and prim.+sec. track information within the coordinate frame f | |
298 | ||
299 | Data(f); // Information of the current jet | |
300 | ||
301 | // The tracks of this jet | |
302 | AliTrack* t; | |
303 | for (Int_t it=1; it<=fNtrk; it++) | |
304 | { | |
305 | t=GetTrack(it); | |
306 | if (t) | |
307 | { | |
308 | cout << " ---Track no. " << it << endl; | |
309 | cout << " "; | |
310 | t->ListAll(f); | |
311 | } | |
312 | else | |
313 | { | |
314 | cout << " *AliJet::List* Error : No track present." << endl; | |
315 | } | |
316 | } | |
317 | } | |
318 | /////////////////////////////////////////////////////////////////////////// | |
319 | Int_t AliJet::GetNtracks() | |
320 | { | |
321 | // Return the current number of tracks of this jet | |
322 | return fNtrk; | |
323 | } | |
324 | /////////////////////////////////////////////////////////////////////////// | |
325 | Double_t AliJet::GetEnergy() | |
326 | { | |
327 | // Return the total energy of the jet | |
328 | return GetScalar(); | |
329 | } | |
330 | /////////////////////////////////////////////////////////////////////////// | |
331 | Double_t AliJet::GetMomentum() | |
332 | { | |
333 | // Return the value of the total jet 3-momentum | |
334 | // The error can be obtained by invoking GetResultError() after | |
335 | // invokation of GetMomentum(). | |
336 | Double_t norm=fV.GetNorm(); | |
337 | fDresult=fV.GetResultError(); | |
338 | return norm; | |
339 | } | |
340 | /////////////////////////////////////////////////////////////////////////// | |
341 | Ali3Vector AliJet::Get3Momentum() | |
342 | { | |
343 | // Return the the total jet 3-momentum | |
344 | Ali3Vector p=Get3Vector(); | |
345 | return p; | |
346 | } | |
347 | /////////////////////////////////////////////////////////////////////////// | |
348 | Double_t AliJet::GetInvmass() | |
349 | { | |
350 | // Return the invariant mass of the jet | |
351 | Double_t m2=Dot(*this); | |
352 | if (m2>0) | |
353 | { | |
354 | return sqrt(m2); | |
355 | } | |
356 | else | |
357 | { | |
358 | return 0; | |
359 | } | |
360 | } | |
361 | /////////////////////////////////////////////////////////////////////////// | |
362 | Float_t AliJet::GetCharge() | |
363 | { | |
364 | // Return the total charge of the jet | |
365 | return fQ; | |
366 | } | |
367 | /////////////////////////////////////////////////////////////////////////// | |
368 | AliTrack* AliJet::GetTrack(Int_t i) | |
369 | { | |
370 | // Return the i-th track of this jet | |
371 | if (!fTracks) | |
372 | { | |
373 | cout << " *AliJet*::GetTrack* No tracks present." << endl; | |
374 | return 0; | |
375 | } | |
376 | else | |
377 | { | |
378 | if (i<=0 || i>fNtrk) | |
379 | { | |
380 | cout << " *AliJet*::GetTrack* Invalid argument i : " << i | |
381 | << " Ntrk = " << fNtrk << endl; | |
382 | return 0; | |
383 | } | |
384 | else | |
385 | { | |
386 | return (AliTrack*)fTracks->At(i-1); | |
387 | } | |
388 | } | |
389 | } | |
390 | /////////////////////////////////////////////////////////////////////////// | |
391 | AliTrack* AliJet::GetIdTrack(Int_t id) | |
392 | { | |
393 | // Return the track with user identifier "id" of this jet | |
394 | AliTrack* tx=0; | |
395 | AliTrack* t=0; | |
396 | if (!fTracks) | |
397 | { | |
398 | cout << " *AliJet*::GetIdTrack* No tracks present." << endl; | |
399 | return 0; | |
400 | } | |
401 | else | |
402 | { | |
403 | for (Int_t i=0; i<fNtrk; i++) | |
404 | { | |
405 | tx=(AliTrack*)fTracks->At(i); | |
406 | if (id == tx->GetId()) t=tx; | |
407 | } | |
408 | return t; | |
409 | } | |
410 | } | |
411 | /////////////////////////////////////////////////////////////////////////// | |
412 | Double_t AliJet::GetPt() | |
413 | { | |
414 | // Provide trans. momentum value w.r.t. z-axis. | |
415 | // The error on the value can be obtained by GetResultError() | |
416 | // after invokation of GetPt(). | |
417 | Ali3Vector v; | |
418 | v=GetVecTrans(); | |
419 | Double_t norm=v.GetNorm(); | |
420 | fDresult=v.GetResultError(); | |
421 | ||
422 | return norm; | |
423 | } | |
424 | /////////////////////////////////////////////////////////////////////////// | |
425 | Double_t AliJet::GetPl() | |
426 | { | |
427 | // Provide long. momentum value w.r.t. z-axis. | |
428 | // Note : the returned value can also be negative. | |
429 | // The error on the value can be obtained by GetResultError() | |
430 | // after invokation of GetPl(). | |
431 | Ali3Vector v; | |
432 | v=GetVecLong(); | |
433 | ||
434 | Double_t pl=v.GetNorm(); | |
435 | fDresult=v.GetResultError(); | |
436 | ||
437 | Double_t a[3]; | |
438 | v.GetVector(a,"sph"); | |
439 | if (cos(a[1])<0) pl=-pl; | |
440 | ||
441 | return pl; | |
442 | } | |
443 | /////////////////////////////////////////////////////////////////////////// | |
444 | Double_t AliJet::GetEt() | |
445 | { | |
446 | // Provide trans. energy value w.r.t. z-axis. | |
447 | // The error on the value can be obtained by GetResultError() | |
448 | // after invokation of GetEt(). | |
449 | Double_t et=GetScaTrans(); | |
450 | ||
451 | return et; | |
452 | } | |
453 | /////////////////////////////////////////////////////////////////////////// | |
454 | Double_t AliJet::GetEl() | |
455 | { | |
456 | // Provide long. energy value w.r.t. z-axis. | |
457 | // Note : the returned value can also be negative. | |
458 | // The error on the value can be obtained by GetResultError() | |
459 | // after invokation of GetEl(). | |
460 | Double_t el=GetScaLong(); | |
461 | ||
462 | return el; | |
463 | } | |
464 | /////////////////////////////////////////////////////////////////////////// | |
465 | Double_t AliJet::GetMt() | |
466 | { | |
467 | // Provide transverse mass value w.r.t. z-axis. | |
468 | // The error on the value can be obtained by GetResultError() | |
469 | // after invokation of GetMt(). | |
470 | Double_t pt=GetPt(); | |
471 | Double_t dpt=GetResultError(); | |
472 | Double_t m=GetInvmass(); | |
473 | Double_t dm=GetResultError(); | |
474 | ||
475 | Double_t mt=sqrt(pt*pt+m*m); | |
476 | Double_t dmt2=0; | |
477 | if (mt) dmt2=(pow((pt*dpt),2)+pow((m*dm),2))/(mt*mt); | |
478 | ||
479 | fDresult=sqrt(dmt2); | |
480 | return mt; | |
481 | } | |
482 | /////////////////////////////////////////////////////////////////////////// | |
483 | Double_t AliJet::GetRapidity() | |
484 | { | |
485 | // Provide rapidity value w.r.t. z-axis. | |
486 | // The error on the value can be obtained by GetResultError() | |
487 | // after invokation of GetRapidity(). | |
488 | // Note : Also GetPseudoRapidity() is available since this class is | |
489 | // derived from Ali4Vector. | |
490 | Double_t e=GetEnergy(); | |
491 | Double_t de=GetResultError(); | |
492 | Double_t pl=GetPl(); | |
493 | Double_t dpl=GetResultError(); | |
494 | Double_t sum=e+pl; | |
495 | Double_t dif=e-pl; | |
496 | ||
497 | Double_t y=9999,dy2=0; | |
498 | if (sum && dif) y=0.5*log(sum/dif); | |
499 | ||
500 | if (sum*dif) dy2=(1./(sum*dif))*(pow((pl*de),2)+pow((e*dpl),2)); | |
501 | ||
502 | fDresult=sqrt(dy2); | |
503 | return y; | |
504 | } | |
505 | /////////////////////////////////////////////////////////////////////////// | |
506 | void AliJet::SetTrackCopy(Int_t j) | |
507 | { | |
508 | // (De)activate the creation of private copies of the added tracks. | |
509 | // j=0 ==> No private copies are made; pointers of original tracks are stored. | |
510 | // j=1 ==> Private copies of the tracks are made and these pointers are stored. | |
511 | // | |
512 | // Note : Once the storage contains pointer(s) to AliTrack(s) one cannot | |
513 | // change the TrackCopy mode anymore. | |
514 | // To change the TrackCopy mode for an existing AliJet containing | |
515 | // tracks one first has to invoke Reset(). | |
516 | if (!fTracks) | |
517 | { | |
518 | if (j==0 || j==1) | |
519 | { | |
520 | fTrackCopy=j; | |
521 | } | |
522 | else | |
523 | { | |
524 | cout << "*AliJet::SetTrackCopy* Invalid argument : " << j << endl; | |
525 | } | |
526 | } | |
527 | else | |
528 | { | |
529 | cout << "*AliJet::SetTrackCopy* Storage already contained tracks." | |
530 | << " ==> TrackCopy mode not changed." << endl; | |
531 | } | |
532 | } | |
533 | /////////////////////////////////////////////////////////////////////////// | |
534 | Int_t AliJet::GetTrackCopy() | |
535 | { | |
536 | // Provide value of the TrackCopy mode. | |
537 | // 0 ==> No private copies are made; pointers of original tracks are stored. | |
538 | // 1 ==> Private copies of the tracks are made and these pointers are stored. | |
539 | return fTrackCopy; | |
540 | } | |
541 | /////////////////////////////////////////////////////////////////////////// | |
542 | void AliJet::SetId(Int_t id) | |
543 | { | |
544 | // Set a user defined identifier for this jet. | |
545 | fUserId=id; | |
546 | } | |
547 | /////////////////////////////////////////////////////////////////////////// | |
548 | Int_t AliJet::GetId() | |
549 | { | |
550 | // Provide the user defined identifier of this jet. | |
551 | return fUserId; | |
552 | } | |
553 | /////////////////////////////////////////////////////////////////////////// |