1 /**************************************************************************
2 * Copyright(c) 1998-1999, ALICE Experiment at CERN, All rights reserved. *
4 * Author: The ALICE Off-line Project. *
5 * Contributors are mentioned in the code where appropriate. *
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 **************************************************************************/
18 ///////////////////////////////////////////////////////////////////////////
20 // Creation and investigation of a jet of particle tracks.
21 // An AliJet can be constructed by adding AliTracks.
23 // To provide maximal flexibility to the user, two modes of track storage
24 // are provided by means of the memberfunction SetTrackCopy().
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
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.
35 // Modifications made to the original tracks also affect the AliTrack objects
36 // which are stored in the AliJet.
38 // b) SetTrackCopy(1).
39 // Of every 'added' track a private copy will be made of which the pointer
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.
48 // See also the documentation provided for the memberfunction SetOwner().
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
57 // ... // code to fill the AliTrack data
64 // j2.SetTrackCopy(1);
65 // AliTrack* tx=new AliTrack();
66 // for (Int_t i=0; i<10; i++)
69 // ... // code to set momentum etc... of the track tx
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);
87 // Note : All quantities are in GeV, GeV/c or GeV/c**2
89 //--- Author: Nick van Eijndhoven 10-jul-1997 UU-SAP Utrecht
90 //- Modified: NvE $Date$ UU-SAP Utrecht
91 ///////////////////////////////////////////////////////////////////////////
94 #include "Riostream.h"
96 ClassImp(AliJet) // Class implementation to enable ROOT I/O
98 AliJet::AliJet() : TNamed(),Ali4Vector()
100 // Default constructor
101 // All variables initialised to 0
102 // Initial maximum number of tracks is set to the default value
107 ///////////////////////////////////////////////////////////////////////////
110 // Initialisation of pointers etc...
116 ///////////////////////////////////////////////////////////////////////////
117 AliJet::AliJet(Int_t n) : TNamed(),Ali4Vector()
119 // Create a jet to hold initially a maximum of n tracks
120 // All variables initialised to 0
130 cout << " *AliJet* Initial max. number of tracks entered : " << n << endl;
131 cout << " This is invalid. Default initial maximum will be used." << endl;
136 ///////////////////////////////////////////////////////////////////////////
139 // Default destructor
151 ///////////////////////////////////////////////////////////////////////////
152 void AliJet::SetOwner(Bool_t own)
154 // Set ownership of all added objects.
155 // The default parameter is own=kTRUE.
157 // Invokation of this memberfunction also sets all the copy modes
158 // (e.g. TrackCopy & co.) according to the value of own.
160 // This function (with own=kTRUE) is particularly useful when reading data
161 // from a tree/file, since Reset() will then actually remove all the
162 // added objects from memory irrespective of the copy mode settings
163 // during the tree/file creation process. In this way it provides a nice way
164 // of preventing possible memory leaks in the reading/analysis process.
166 // In addition this memberfunction can also be used as a shortcut to set all
167 // copy modes in one go during a tree/file creation process.
168 // However, in this case the user has to take care to only set/change the
169 // ownership (and copy mode) for empty objects (e.g. newly created objects
170 // or after invokation of the Reset() memberfunction) otherwise it will
171 // very likely result in inconsistent destructor behaviour.
175 if (fTracks) fTracks->SetOwner(own);
178 ///////////////////////////////////////////////////////////////////////////
179 AliJet::AliJet(const AliJet& j) : TNamed(j),Ali4Vector(j)
186 fTrackCopy=j.fTrackCopy;
194 fTracks=new TObjArray(fNtmax);
195 if (fTrackCopy) fTracks->SetOwner();
198 for (Int_t i=1; i<=fNtrk; i++)
200 AliTrack* tx=j.GetTrack(i);
203 fTracks->Add(tx->Clone());
211 ///////////////////////////////////////////////////////////////////////////
212 void AliJet::SetNtinit(Int_t n)
214 // Set the initial maximum number of tracks for this jet
224 ///////////////////////////////////////////////////////////////////////////
227 // Reset all variables to 0
228 // The max. number of tracks is set to the initial value again
232 Double_t a[4]={0,0,0,0};
234 if (fNtinit > 0) SetNtinit(fNtinit);
236 ///////////////////////////////////////////////////////////////////////////
237 void AliJet::AddTrack(AliTrack& t)
239 // Add a track to the jet.
240 // In case the maximum number of tracks has been reached
241 // space will be extended to hold an additional amount of tracks as
242 // was initially reserved.
243 // See SetTrackCopy() to tailor the functionality of the stored structures.
246 // In case a private copy is made, this is performed via the Clone() memberfunction.
247 // All AliTrack and derived classes have the default TObject::Clone() memberfunction.
248 // However, derived classes generally contain an internal data structure which may
249 // include pointers to other objects. Therefore it is recommended to provide
250 // for all derived classes a specific copy constructor and override the default Clone()
251 // memberfunction using this copy constructor.
252 // An example for this may be seen from AliTrack.
256 ///////////////////////////////////////////////////////////////////////////
257 void AliJet::AddTrack(AliTrack& t,Int_t copy)
259 // Internal memberfunction to actually add a track to the jet.
260 // In case the maximum number of tracks has been reached
261 // space will be extended to hold an additional amount of tracks as
262 // was initially reserved.
264 // If copy=0 NO copy of the track will be made, irrespective of the setting
265 // of the TrackCopy flag.
266 // This allows a proper treatment of automatically generated connecting
267 // tracks between vertices.
270 // In case a private copy is made, this is performed via the Clone() memberfunction.
274 fTracks=new TObjArray(fNtmax);
275 if (fTrackCopy) fTracks->SetOwner();
277 if (fNtrk == fNtmax) // Check if maximum track number is reached
280 fTracks->Expand(fNtmax);
283 // Add the track to this jet
285 if (fTrackCopy && copy)
287 fTracks->Add(t.Clone());
294 (*this)+=(Ali4Vector&)t;
298 ///////////////////////////////////////////////////////////////////////////
299 void AliJet::Data(TString f)
301 // Provide jet information within the coordinate frame f
302 const char* name=GetName();
303 const char* title=GetTitle();
305 cout << " *AliJet::Data*";
306 if (strlen(name)) cout << " Name : " << GetName();
307 if (strlen(title)) cout << " Title : " << GetTitle();
309 cout << " Id : " << fUserId << " Invmass : " << GetInvmass() << " Charge : " << fQ
310 << " Momentum : " << GetMomentum() << endl;
316 ///////////////////////////////////////////////////////////////////////////
317 void AliJet::List(TString f)
319 // Provide jet and primary track information within the coordinate frame f
321 Data(f); // Information of the current jet
323 // The tracks of this jet
325 for (Int_t it=1; it<=fNtrk; it++)
330 cout << " ---Track no. " << it << endl;
336 cout << " *AliJet::List* Error : No track present." << endl;
340 ///////////////////////////////////////////////////////////////////////////
341 void AliJet::ListAll(TString f)
343 // Provide jet and prim.+sec. track information within the coordinate frame f
345 Data(f); // Information of the current jet
347 // The tracks of this jet
349 for (Int_t it=1; it<=fNtrk; it++)
354 cout << " ---Track no. " << it << endl;
360 cout << " *AliJet::List* Error : No track present." << endl;
364 ///////////////////////////////////////////////////////////////////////////
365 Int_t AliJet::GetNtracks(Int_t idmode,Int_t chmode,Int_t pcode)
367 // Provide the number of user selected tracks in this jet based on the
368 // idmode, chmode and pcode selections as specified by the user.
369 // For specification of the selection parameters see GetTracks().
370 // The default parameters correspond to no selection, which implies
371 // that invokation of GetNtracks() just returns the total number of
372 // tracks registered in this jet.
374 // Note : In case certain selections are specified, this function
375 // invokes GetTracks(idmode,chmode,pcode) to determine the
376 // number of tracks corresponding to the selections.
377 // When the jet contains a large number of tracks, invokation
378 // of GetTracks(idmode,chmode,pcode) and subsequently invoking
379 // GetEntries() for the resulting TObjArray* might be slightly
383 if (idmode==0 && chmode==2 && pcode==0)
389 TObjArray* arr=GetTracks(idmode,chmode,pcode);
394 ///////////////////////////////////////////////////////////////////////////
395 Double_t AliJet::GetEnergy()
397 // Return the total energy of the jet
400 ///////////////////////////////////////////////////////////////////////////
401 Double_t AliJet::GetMomentum()
403 // Return the value of the total jet 3-momentum
404 // The error can be obtained by invoking GetResultError() after
405 // invokation of GetMomentum().
406 Double_t norm=fV.GetNorm();
407 fDresult=fV.GetResultError();
410 ///////////////////////////////////////////////////////////////////////////
411 Ali3Vector AliJet::Get3Momentum() const
413 // Return the the total jet 3-momentum
414 Ali3Vector p=Get3Vector();
417 ///////////////////////////////////////////////////////////////////////////
418 Double_t AliJet::GetInvmass()
420 // Return the invariant mass of the jet
421 Double_t m2=Dot(*this);
431 ///////////////////////////////////////////////////////////////////////////
432 Float_t AliJet::GetCharge() const
434 // Return the total charge of the jet
437 ///////////////////////////////////////////////////////////////////////////
438 AliTrack* AliJet::GetTrack(Int_t i) const
440 // Return the i-th track of this jet
442 if (!fTracks) return 0;
446 cout << " *AliJet*::GetTrack* Invalid argument i : " << i
447 << " Ntrk = " << fNtrk << endl;
452 return (AliTrack*)fTracks->At(i-1);
455 ///////////////////////////////////////////////////////////////////////////
456 AliTrack* AliJet::GetIdTrack(Int_t id) const
458 // Return the track with user identifier "id" of this jet
459 if (!fTracks) return 0;
462 for (Int_t i=0; i<fNtrk; i++)
464 tx=(AliTrack*)fTracks->At(i);
465 if (id == tx->GetId()) return tx;
467 return 0; // No matching id found
469 ///////////////////////////////////////////////////////////////////////////
470 TObjArray* AliJet::GetTracks(Int_t idmode,Int_t chmode,Int_t pcode)
472 // Provide references to user selected tracks based on the idmode, chmode
473 // and pcode selections as specified by the user.
475 // The following selection combinations are available :
476 // ----------------------------------------------------
477 // idmode = -1 ==> Select tracks with negative user identifier "id"
478 // 0 ==> No selection on user identifier
479 // 1 ==> Select tracks with positive user identifier "id"
481 // chmode = -1 ==> Select tracks with negative charge
482 // 0 ==> Select neutral tracks
483 // 1 ==> Select tracks with positive charge
484 // 2 ==> No selection on charge
485 // 3 ==> Select all charged tracks
487 // pcode = 0 ==> No selection on particle code
488 // X ==> Select tracks with particle code +X or -X
489 // This allows selection of both particles and anti-particles
490 // in case of PDG particle codes.
491 // Selection of either particles or anti-particles can be
492 // obtained in combination with the "chmode" selector.
496 // idmode=-1 chmode=0 pcode=0 : Selection of all neutral tracks with negative id.
497 // idmode=0 chmode=2 pcode=211 : Selection of all charged pions (PDG convention).
498 // idmode=0 chmode=1 pcode=321 : Selection of all positive kaons (PDG convention).
500 // The default values are idmode=0 chmode=2 pcode=0 (i.e. no selections applied).
504 // 1) In case the user has labeled simulated tracks with negative id and
505 // reconstructed tracks with positive id, this memberfunction provides
506 // easy access to either all simulated or reconstructed tracks.
507 // 2) Subsequent invokations of this memberfunction with e.g. chmode=-1 and chmode=1
508 // provides a convenient way to investigate particle pairs with opposite charge
509 // (e.g. for invariant mass analysis).
517 fSelected=new TObjArray();
520 if (!fTracks) return fSelected;
526 for (Int_t i=0; i<fNtrk; i++)
528 tx=(AliTrack*)fTracks->At(i);
531 code=tx->GetParticleCode();
532 if (pcode && abs(pcode)!=abs(code)) continue;
535 if (idmode==-1 && id>=0) continue;
536 if (idmode==1 && id<=0) continue;
539 if (chmode==-1 && q>=0) continue;
540 if (chmode==0 && fabs(q)>1e-10) continue;
541 if (chmode==1 && q<=0) continue;
542 if (chmode==3 && fabs(q)<1e-10) continue;
549 ///////////////////////////////////////////////////////////////////////////
550 void AliJet::ShowTracks(Int_t mode)
552 // Provide an overview of the available tracks.
553 // The argument mode determines the amount of information as follows :
554 // mode = 0 ==> Only printout of the number of tracks
555 // 1 ==> Provide a listing with 1 line of info for each track
557 // The default is mode=1.
559 Int_t ntk=GetNtracks();
564 cout << " There are " << ntk << " tracks available." << endl;
568 cout << " The following " << ntk << " tracks are available :" << endl;
569 for (Int_t i=1; i<=ntk; i++)
571 AliTrack* tx=GetTrack(i);
574 const char* name=tx->GetName();
575 const char* title=tx->GetTitle();
576 cout << " Track : " << i;
577 cout << " Id : " << tx->GetId();
578 cout << " Q : " << tx->GetCharge() << " m : " << tx->GetMass() << " p : " << tx->GetMomentum();
579 if (strlen(name)) cout << " Name : " << name;
580 if (strlen(title)) cout << " Title : " << title;
588 cout << " No tracks are present." << endl;
591 ///////////////////////////////////////////////////////////////////////////
592 Double_t AliJet::GetPt()
594 // Provide trans. momentum value w.r.t. z-axis.
595 // The error on the value can be obtained by GetResultError()
596 // after invokation of GetPt().
599 Double_t norm=v.GetNorm();
600 fDresult=v.GetResultError();
604 ///////////////////////////////////////////////////////////////////////////
605 Double_t AliJet::GetPl()
607 // Provide long. momentum value w.r.t. z-axis.
608 // Note : the returned value can also be negative.
609 // The error on the value can be obtained by GetResultError()
610 // after invokation of GetPl().
614 Double_t pl=v.GetNorm();
615 fDresult=v.GetResultError();
618 v.GetVector(a,"sph");
619 if (cos(a[1])<0) pl=-pl;
623 ///////////////////////////////////////////////////////////////////////////
624 Double_t AliJet::GetEt()
626 // Provide trans. energy value w.r.t. z-axis.
627 // The error on the value can be obtained by GetResultError()
628 // after invokation of GetEt().
629 Double_t et=GetScaTrans();
633 ///////////////////////////////////////////////////////////////////////////
634 Double_t AliJet::GetEl()
636 // Provide long. energy value w.r.t. z-axis.
637 // Note : the returned value can also be negative.
638 // The error on the value can be obtained by GetResultError()
639 // after invokation of GetEl().
640 Double_t el=GetScaLong();
644 ///////////////////////////////////////////////////////////////////////////
645 Double_t AliJet::GetMt()
647 // Provide transverse mass value w.r.t. z-axis.
648 // The error on the value can be obtained by GetResultError()
649 // after invokation of GetMt().
651 Double_t dpt=GetResultError();
652 Double_t m=GetInvmass();
653 Double_t dm=GetResultError();
655 Double_t mt=sqrt(pt*pt+m*m);
657 if (mt) dmt2=(pow((pt*dpt),2)+pow((m*dm),2))/(mt*mt);
662 ///////////////////////////////////////////////////////////////////////////
663 Double_t AliJet::GetRapidity()
665 // Provide rapidity value w.r.t. z-axis.
666 // The error on the value can be obtained by GetResultError()
667 // after invokation of GetRapidity().
668 // Note : Also GetPseudoRapidity() is available since this class is
669 // derived from Ali4Vector.
670 Double_t e=GetEnergy();
671 Double_t de=GetResultError();
673 Double_t dpl=GetResultError();
677 Double_t y=9999,dy2=0;
678 if (sum && dif) y=0.5*log(sum/dif);
680 if (sum*dif) dy2=(1./(sum*dif))*(pow((pl*de),2)+pow((e*dpl),2));
685 ///////////////////////////////////////////////////////////////////////////
686 void AliJet::SetTrackCopy(Int_t j)
688 // (De)activate the creation of private copies of the added tracks.
689 // j=0 ==> No private copies are made; pointers of original tracks are stored.
690 // j=1 ==> Private copies of the tracks are made and these pointers are stored.
692 // Note : Once the storage contains pointer(s) to AliTrack(s) one cannot
693 // change the TrackCopy mode anymore.
694 // To change the TrackCopy mode for an existing AliJet containing
695 // tracks one first has to invoke Reset().
704 cout << "*AliJet::SetTrackCopy* Invalid argument : " << j << endl;
709 cout << "*AliJet::SetTrackCopy* Storage already contained tracks."
710 << " ==> TrackCopy mode not changed." << endl;
713 ///////////////////////////////////////////////////////////////////////////
714 Int_t AliJet::GetTrackCopy() const
716 // Provide value of the TrackCopy mode.
717 // 0 ==> No private copies are made; pointers of original tracks are stored.
718 // 1 ==> Private copies of the tracks are made and these pointers are stored.
721 ///////////////////////////////////////////////////////////////////////////
722 void AliJet::SetId(Int_t id)
724 // Set a user defined identifier for this jet.
727 ///////////////////////////////////////////////////////////////////////////
728 Int_t AliJet::GetId() const
730 // Provide the user defined identifier of this jet.
733 ///////////////////////////////////////////////////////////////////////////
734 TObject* AliJet::Clone(const char* name) const
736 // Make a deep copy of the current object and provide the pointer to the copy.
737 // This memberfunction enables automatic creation of new objects of the
738 // correct type depending on the object type, a feature which may be very useful
739 // for containers when adding objects in case the container owns the objects.
740 // This feature allows e.g. AliVertex to store either AliJet objects or
741 // objects derived from AliJet via the AddJet memberfunction, provided
742 // these derived classes also have a proper Clone memberfunction.
744 AliJet* jet=new AliJet(*this);
747 if (strlen(name)) jet->SetName(name);
751 ///////////////////////////////////////////////////////////////////////////