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...
117 ///////////////////////////////////////////////////////////////////////////
118 AliJet::AliJet(Int_t n) : TNamed(),Ali4Vector()
120 // Create a jet to hold initially a maximum of n tracks
121 // All variables initialised to 0
131 cout << " *AliJet* Initial max. number of tracks entered : " << n << endl;
132 cout << " This is invalid. Default initial maximum will be used." << endl;
137 ///////////////////////////////////////////////////////////////////////////
140 // Default destructor
157 ///////////////////////////////////////////////////////////////////////////
158 void AliJet::SetOwner(Bool_t own)
160 // Set ownership of all added objects.
161 // The default parameter is own=kTRUE.
163 // Invokation of this memberfunction also sets all the copy modes
164 // (e.g. TrackCopy & co.) according to the value of own.
166 // This function (with own=kTRUE) is particularly useful when reading data
167 // from a tree/file, since Reset() will then actually remove all the
168 // added objects from memory irrespective of the copy mode settings
169 // during the tree/file creation process. In this way it provides a nice way
170 // of preventing possible memory leaks in the reading/analysis process.
172 // In addition this memberfunction can also be used as a shortcut to set all
173 // copy modes in one go during a tree/file creation process.
174 // However, in this case the user has to take care to only set/change the
175 // ownership (and copy mode) for empty objects (e.g. newly created objects
176 // or after invokation of the Reset() memberfunction) otherwise it will
177 // very likely result in inconsistent destructor behaviour.
181 if (fTracks) fTracks->SetOwner(own);
184 ///////////////////////////////////////////////////////////////////////////
185 AliJet::AliJet(const AliJet& j) : TNamed(j),Ali4Vector(j)
192 fTrackCopy=j.fTrackCopy;
194 if (j.fRef) fRef=new AliPositionObj(*(j.fRef));
201 fTracks=new TObjArray(fNtmax);
202 if (fTrackCopy) fTracks->SetOwner();
205 for (Int_t i=1; i<=fNtrk; i++)
207 AliTrack* tx=j.GetTrack(i);
210 fTracks->Add(tx->Clone());
218 ///////////////////////////////////////////////////////////////////////////
219 void AliJet::SetNtinit(Int_t n)
221 // Set the initial maximum number of tracks for this jet
236 ///////////////////////////////////////////////////////////////////////////
239 // Reset all variables to 0
240 // The max. number of tracks is set to the initial value again
244 Double_t a[4]={0,0,0,0};
246 if (fNtinit > 0) SetNtinit(fNtinit);
248 ///////////////////////////////////////////////////////////////////////////
249 void AliJet::AddTrack(AliTrack& t)
251 // Add a track to the jet.
252 // In case the maximum number of tracks has been reached
253 // space will be extended to hold an additional amount of tracks as
254 // was initially reserved.
255 // See SetTrackCopy() to tailor the functionality of the stored structures.
259 // In case a private copy is made, this is performed via the Clone() memberfunction.
260 // All AliTrack and derived classes have the default TObject::Clone() memberfunction.
261 // However, derived classes generally contain an internal data structure which may
262 // include pointers to other objects. Therefore it is recommended to provide
263 // for all derived classes a specific copy constructor and override the default Clone()
264 // memberfunction using this copy constructor.
265 // An example for this may be seen from AliTrack.
267 // In case NO private copy is made, a check will be performed if this
268 // specific track is already present in the jet.
269 // If this is the case, no action is performed to prevent multiple
270 // additions of the same track.
275 ///////////////////////////////////////////////////////////////////////////
276 void AliJet::AddTrack(AliTrack& t,Int_t copy)
278 // Internal memberfunction to actually add a track to the jet.
279 // In case the maximum number of tracks has been reached
280 // space will be extended to hold an additional amount of tracks as
281 // was initially reserved.
283 // If copy=0 NO copy of the track will be made, irrespective of the setting
284 // of the TrackCopy flag.
285 // This allows a proper treatment of automatically generated connecting
286 // tracks between vertices.
288 // In case NO copy of the track is made, a check will be performed if this
289 // specific track is already present in the jet.
290 // If this is the case, no action is performed to prevent multiple
291 // additions of the same track.
294 // In case a private copy is made, this is performed via the Clone() memberfunction.
298 fTracks=new TObjArray(fNtmax);
299 if (fTrackCopy) fTracks->SetOwner();
301 else if (!fTrackCopy || !copy) // Check if this track is already present
303 for (Int_t i=0; i<fNtrk; i++)
305 AliTrack* tx=(AliTrack*)fTracks->At(i);
306 if (tx == &t) return;
310 if (fNtrk == fNtmax) // Check if maximum track number is reached
313 fTracks->Expand(fNtmax);
316 // Add the track to this jet
318 if (fTrackCopy && copy)
320 fTracks->Add(t.Clone());
327 (*this)+=(Ali4Vector&)t;
331 ///////////////////////////////////////////////////////////////////////////
332 void AliJet::Data(TString f,TString u)
334 // Provide jet information within the coordinate frame f
336 // The string argument "u" allows to choose between different angular units
337 // in case e.g. a spherical frame is selected.
338 // u = "rad" : angles provided in radians
339 // "deg" : angles provided in degrees
341 // The defaults are f="car" and u="rad".
343 const char* name=GetName();
344 const char* title=GetTitle();
346 cout << " *AliJet::Data*";
347 if (strlen(name)) cout << " Name : " << GetName();
348 if (strlen(title)) cout << " Title : " << GetTitle();
350 cout << " Id : " << fUserId << " Invmass : " << GetInvmass() << " Charge : " << fQ
351 << " Momentum : " << GetMomentum() << endl;
355 Ali4Vector::Data(f,u);
357 ///////////////////////////////////////////////////////////////////////////
358 void AliJet::List(TString f,TString u)
360 // Provide jet and primary track information within the coordinate frame f
362 // The string argument "u" allows to choose between different angular units
363 // in case e.g. a spherical frame is selected.
364 // u = "rad" : angles provided in radians
365 // "deg" : angles provided in degrees
367 // The defaults are f="car" and u="rad".
369 Data(f,u); // Information of the current jet
370 if (fRef) { cout << " Ref-point :"; fRef->Data(f,u); }
372 // The tracks of this jet
374 for (Int_t it=1; it<=fNtrk; it++)
379 cout << " ---Track no. " << it << endl;
385 cout << " *AliJet::List* Error : No track present." << endl;
389 ///////////////////////////////////////////////////////////////////////////
390 void AliJet::ListAll(TString f,TString u)
392 // Provide jet and prim.+sec. track information within the coordinate frame f
394 // The string argument "u" allows to choose between different angular units
395 // in case e.g. a spherical frame is selected.
396 // u = "rad" : angles provided in radians
397 // "deg" : angles provided in degrees
399 // The defaults are f="car" and u="rad".
401 Data(f,u); // Information of the current jet
402 if (fRef) { cout << " Ref-point :"; fRef->Data(f,u); }
404 // The tracks of this jet
406 for (Int_t it=1; it<=fNtrk; it++)
411 cout << " ---Track no. " << it << endl;
417 cout << " *AliJet::List* Error : No track present." << endl;
421 ///////////////////////////////////////////////////////////////////////////
422 Int_t AliJet::GetNtracks(Int_t idmode,Int_t chmode,Int_t pcode)
424 // Provide the number of user selected tracks in this jet based on the
425 // idmode, chmode and pcode selections as specified by the user.
426 // For specification of the selection parameters see GetTracks().
427 // The default parameters correspond to no selection, which implies
428 // that invokation of GetNtracks() just returns the total number of
429 // tracks registered in this jet.
431 // Note : In case certain selections are specified, this function
432 // invokes GetTracks(idmode,chmode,pcode) to determine the
433 // number of tracks corresponding to the selections.
434 // When the jet contains a large number of tracks, invokation
435 // of GetTracks(idmode,chmode,pcode) and subsequently invoking
436 // GetEntries() for the resulting TObjArray* might be slightly
440 if (idmode==0 && chmode==2 && pcode==0)
446 TObjArray* arr=GetTracks(idmode,chmode,pcode);
451 ///////////////////////////////////////////////////////////////////////////
452 Double_t AliJet::GetEnergy()
454 // Return the total energy of the jet
457 ///////////////////////////////////////////////////////////////////////////
458 Double_t AliJet::GetMomentum()
460 // Return the value of the total jet 3-momentum
461 // The error can be obtained by invoking GetResultError() after
462 // invokation of GetMomentum().
463 Double_t norm=fV.GetNorm();
464 fDresult=fV.GetResultError();
467 ///////////////////////////////////////////////////////////////////////////
468 Ali3Vector AliJet::Get3Momentum() const
470 // Return the the total jet 3-momentum
471 Ali3Vector p=Get3Vector();
474 ///////////////////////////////////////////////////////////////////////////
475 Double_t AliJet::GetInvmass()
477 // Return the invariant mass of the jet
478 Double_t m2=Dot(*this);
488 ///////////////////////////////////////////////////////////////////////////
489 Float_t AliJet::GetCharge() const
491 // Return the total charge of the jet
494 ///////////////////////////////////////////////////////////////////////////
495 AliTrack* AliJet::GetTrack(Int_t i) const
497 // Return the i-th track of this jet
499 if (!fTracks) return 0;
503 cout << " *AliJet*::GetTrack* Invalid argument i : " << i
504 << " Ntrk = " << fNtrk << endl;
509 return (AliTrack*)fTracks->At(i-1);
512 ///////////////////////////////////////////////////////////////////////////
513 AliTrack* AliJet::GetIdTrack(Int_t id) const
515 // Return the track with user identifier "id" of this jet
516 if (!fTracks) return 0;
519 for (Int_t i=0; i<fNtrk; i++)
521 tx=(AliTrack*)fTracks->At(i);
522 if (id == tx->GetId()) return tx;
524 return 0; // No matching id found
526 ///////////////////////////////////////////////////////////////////////////
527 TObjArray* AliJet::GetTracks(Int_t idmode,Int_t chmode,Int_t pcode)
529 // Provide references to user selected tracks based on the idmode, chmode
530 // and pcode selections as specified by the user.
532 // The following selection combinations are available :
533 // ----------------------------------------------------
534 // idmode = -1 ==> Select tracks with negative user identifier "id"
535 // 0 ==> No selection on user identifier
536 // 1 ==> Select tracks with positive user identifier "id"
538 // chmode = -1 ==> Select tracks with negative charge
539 // 0 ==> Select neutral tracks
540 // 1 ==> Select tracks with positive charge
541 // 2 ==> No selection on charge
542 // 3 ==> Select all charged tracks
544 // pcode = 0 ==> No selection on particle code
545 // X ==> Select tracks with particle code +X or -X
546 // This allows selection of both particles and anti-particles
547 // in case of PDG particle codes.
548 // Selection of either particles or anti-particles can be
549 // obtained in combination with the "chmode" selector.
553 // idmode=-1 chmode=0 pcode=0 : Selection of all neutral tracks with negative id.
554 // idmode=0 chmode=2 pcode=211 : Selection of all charged pions (PDG convention).
555 // idmode=0 chmode=1 pcode=321 : Selection of all positive kaons (PDG convention).
557 // The default values are idmode=0 chmode=2 pcode=0 (i.e. no selections applied).
561 // 1) In case the user has labeled simulated tracks with negative id and
562 // reconstructed tracks with positive id, this memberfunction provides
563 // easy access to either all simulated or reconstructed tracks.
564 // 2) Subsequent invokations of this memberfunction with e.g. chmode=-1 and chmode=1
565 // provides a convenient way to investigate particle pairs with opposite charge
566 // (e.g. for invariant mass analysis).
567 // 3) The selected track pointers are returned via a multi-purpose array,
568 // which will be overwritten by subsequent selections.
569 // In case the selected track list is to be used amongst other selections,
570 // the user is advised to store the selected track pointers in a local
571 // TObjArray or TRefArray.
579 fSelected=new TObjArray();
582 if (!fTracks) return fSelected;
588 for (Int_t i=0; i<fNtrk; i++)
590 tx=(AliTrack*)fTracks->At(i);
593 code=tx->GetParticleCode();
594 if (pcode && abs(pcode)!=abs(code)) continue;
597 if (idmode==-1 && id>=0) continue;
598 if (idmode==1 && id<=0) continue;
601 if (chmode==-1 && q>=0) continue;
602 if (chmode==0 && fabs(q)>1e-10) continue;
603 if (chmode==1 && q<=0) continue;
604 if (chmode==3 && fabs(q)<1e-10) continue;
611 ///////////////////////////////////////////////////////////////////////////
612 TObjArray* AliJet::GetTracks(TString name)
614 // Provide references to all tracks with the specified name.
618 // 1) In case the user has labeled reconstructed tracks with the name of
619 // the applied reconstruction algorithm, this memberfunction provides
620 // easy access to all tracks reconstructed by a certain method.
621 // 2) The selected track pointers are returned via a multi-purpose array,
622 // which will be overwritten by subsequent selections.
623 // In case the selected track list is to be used amongst other selections,
624 // the user is advised to store the selected track pointers in a local
625 // TObjArray or TRefArray.
633 fSelected=new TObjArray();
636 if (!fTracks) return fSelected;
640 for (Int_t i=0; i<fNtrk; i++)
642 tx=(AliTrack*)fTracks->At(i);
646 if (s == name) fSelected->Add(tx);
651 ///////////////////////////////////////////////////////////////////////////
652 void AliJet::RemoveTracks(TString name)
654 // Remove all tracks with the specified name.
655 // If name="*" all tracks will be removed.
659 // In case the user has labeled reconstructed tracks with the name of
660 // the applied reconstruction algorithm, this memberfunction provides
661 // easy removal of all tracks reconstructed by a certain method.
663 if (!fTracks) return;
668 for (Int_t i=0; i<fNtrk; i++)
670 tx=(AliTrack*)fTracks->At(i);
674 if (s==name || name=="*")
676 obj=fTracks->Remove(tx);
677 if (obj && fTracks->IsOwner()) delete tx;
681 fNtrk=fTracks->GetEntries();
683 ///////////////////////////////////////////////////////////////////////////
684 void AliJet::RemoveTracks(Int_t idmode,Int_t chmode,Int_t pcode)
686 // Remove user selected tracks based on the idmode, chmode and pcode
687 // selections as specified by the user.
688 // For defintions of these selections see the corresponding GetTracks()
691 if (!fTracks) return;
693 TObjArray* arr=GetTracks(idmode,chmode,pcode);
696 Int_t ntk=arr->GetEntries();
701 for (Int_t i=0; i<ntk; i++)
703 tx=(AliTrack*)arr->At(i);
706 obj=fTracks->Remove(tx);
707 if (obj && fTracks->IsOwner()) delete tx;
710 fNtrk=fTracks->GetEntries();
713 ///////////////////////////////////////////////////////////////////////////
714 void AliJet::ShowTracks(Int_t mode)
716 // Provide an overview of the available tracks.
717 // The argument mode determines the amount of information as follows :
718 // mode = 0 ==> Only printout of the number of tracks
719 // 1 ==> Provide a listing with 1 line of info for each track
721 // The default is mode=1.
723 Int_t ntk=GetNtracks();
728 cout << " There are " << ntk << " tracks available." << endl;
732 cout << " The following " << ntk << " tracks are available :" << endl;
733 for (Int_t i=1; i<=ntk; i++)
735 AliTrack* tx=GetTrack(i);
738 const char* name=tx->GetName();
739 const char* title=tx->GetTitle();
740 cout << " Track : " << i;
741 cout << " Id : " << tx->GetId();
742 cout << " Q : " << tx->GetCharge() << " m : " << tx->GetMass() << " p : " << tx->GetMomentum();
743 if (strlen(name)) cout << " Name : " << name;
744 if (strlen(title)) cout << " Title : " << title;
752 cout << " No tracks are present." << endl;
755 ///////////////////////////////////////////////////////////////////////////
756 Double_t AliJet::GetPt()
758 // Provide trans. momentum value w.r.t. z-axis.
759 // The error on the value can be obtained by GetResultError()
760 // after invokation of GetPt().
763 Double_t norm=v.GetNorm();
764 fDresult=v.GetResultError();
768 ///////////////////////////////////////////////////////////////////////////
769 Double_t AliJet::GetPl()
771 // Provide long. momentum value w.r.t. z-axis.
772 // Note : the returned value can also be negative.
773 // The error on the value can be obtained by GetResultError()
774 // after invokation of GetPl().
778 Double_t pl=v.GetNorm();
779 fDresult=v.GetResultError();
782 v.GetVector(a,"sph");
783 if (cos(a[1])<0) pl=-pl;
787 ///////////////////////////////////////////////////////////////////////////
788 Double_t AliJet::GetEt()
790 // Provide trans. energy value w.r.t. z-axis.
791 // The error on the value can be obtained by GetResultError()
792 // after invokation of GetEt().
793 Double_t et=GetScaTrans();
797 ///////////////////////////////////////////////////////////////////////////
798 Double_t AliJet::GetEl()
800 // Provide long. energy value w.r.t. z-axis.
801 // Note : the returned value can also be negative.
802 // The error on the value can be obtained by GetResultError()
803 // after invokation of GetEl().
804 Double_t el=GetScaLong();
808 ///////////////////////////////////////////////////////////////////////////
809 Double_t AliJet::GetMt()
811 // Provide transverse mass value w.r.t. z-axis.
812 // The error on the value can be obtained by GetResultError()
813 // after invokation of GetMt().
815 Double_t dpt=GetResultError();
816 Double_t m=GetInvmass();
817 Double_t dm=GetResultError();
819 Double_t mt=sqrt(pt*pt+m*m);
821 if (mt) dmt2=(pow((pt*dpt),2)+pow((m*dm),2))/(mt*mt);
826 ///////////////////////////////////////////////////////////////////////////
827 Double_t AliJet::GetRapidity()
829 // Provide rapidity value w.r.t. z-axis.
830 // The error on the value can be obtained by GetResultError()
831 // after invokation of GetRapidity().
832 // Note : Also GetPseudoRapidity() is available since this class is
833 // derived from Ali4Vector.
834 Double_t e=GetEnergy();
835 Double_t de=GetResultError();
837 Double_t dpl=GetResultError();
841 Double_t y=9999,dy2=0;
842 if (sum && dif) y=0.5*log(sum/dif);
844 if (sum*dif) dy2=(1./(sum*dif))*(pow((pl*de),2)+pow((e*dpl),2));
849 ///////////////////////////////////////////////////////////////////////////
850 void AliJet::SetTrackCopy(Int_t j)
852 // (De)activate the creation of private copies of the added tracks.
853 // j=0 ==> No private copies are made; pointers of original tracks are stored.
854 // j=1 ==> Private copies of the tracks are made and these pointers are stored.
856 // Note : Once the storage contains pointer(s) to AliTrack(s) one cannot
857 // change the TrackCopy mode anymore.
858 // To change the TrackCopy mode for an existing AliJet containing
859 // tracks one first has to invoke Reset().
868 cout << "*AliJet::SetTrackCopy* Invalid argument : " << j << endl;
873 cout << "*AliJet::SetTrackCopy* Storage already contained tracks."
874 << " ==> TrackCopy mode not changed." << endl;
877 ///////////////////////////////////////////////////////////////////////////
878 Int_t AliJet::GetTrackCopy() const
880 // Provide value of the TrackCopy mode.
881 // 0 ==> No private copies are made; pointers of original tracks are stored.
882 // 1 ==> Private copies of the tracks are made and these pointers are stored.
885 ///////////////////////////////////////////////////////////////////////////
886 void AliJet::SetId(Int_t id)
888 // Set a user defined identifier for this jet.
891 ///////////////////////////////////////////////////////////////////////////
892 Int_t AliJet::GetId() const
894 // Provide the user defined identifier of this jet.
897 ///////////////////////////////////////////////////////////////////////////
898 void AliJet::SetReferencePoint(AliPosition& p)
900 // Store the position of the jet reference-point.
901 // The reference-point of a jet provides a means to define a generic
902 // space-time location for the jet as a whole.
903 // This doesn't have to be necessarily the location where all the constituent
904 // tracks originate (e.g. a bundle of parallel tracks doesn't have such
905 // a location). As such the meaning of this reference-point is different from
906 // a normal vertex position and allows to provide complimentary information.
907 // This reference point is the preferable point to start e.g. extrapolations
908 // and investigate coincidences in space and/or time.
909 if (fRef) delete fRef;
910 fRef=new AliPositionObj(p);
912 ///////////////////////////////////////////////////////////////////////////
913 AliPosition* AliJet::GetReferencePoint()
915 // Provide the position of the jet reference-point.
916 // The reference-point of a jet provides a means to define a generic
917 // space-time location for the jet as a whole.
918 // This doesn't have to be necessarily the location where all the constituent
919 // tracks originate (e.g. a bundle of parallel tracks doesn't have such
920 // a location). As such the meaning of this reference-point is different from
921 // a normal vertex position and allows to provide complimentary information.
922 // This reference point is the preferable point to start e.g. extrapolations
923 // and investigate coincidences in space and/or time.
926 ///////////////////////////////////////////////////////////////////////////
927 TObjArray* AliJet::SortTracks(Int_t mode,TObjArray* tracks)
929 // Order the references to an array of tracks by looping over the input array "tracks"
930 // and checking the value of a certain observable.
931 // The ordered array is returned as a TObjArray.
932 // In case tracks=0 (default), the registered tracks of the current jet are used.
933 // Note that the original track array is not modified.
934 // Via the "mode" argument the user can specify the observable to be checked upon
935 // and specify whether sorting should be performed in decreasing order (mode<0)
936 // or in increasing order (mode>0).
938 // The convention for the observable selection is the following :
939 // mode : 1 ==> Number of signals associated to the track
940 // 2 ==> Track energy
941 // 3 ==> Track momentum
942 // 4 ==> Mass of the track
943 // 5 ==> Transverse momentum of the track
944 // 6 ==> Longitudinal momentum of the track
945 // 7 ==> Transverse energy of the track
946 // 8 ==> Longitudinal energy of the track
947 // 9 ==> Transverse mass of the track
948 // 10 ==> Track rapidity
949 // 11 ==> Pseudo-rapidity of the track
951 // The default is mode=-1.
953 // Note : This sorting routine uses a common area in memory, which is used
954 // by various other sorting facilities as well.
955 // This means that the resulting sorted TObjArray may be overwritten
956 // when another sorting is invoked.
957 // To retain the sorted list of pointers, the user is advised to copy
958 // the pointers contained in the returned TObjArray into a private
959 // TObjArray instance.
967 if (!tracks) tracks=fTracks;
969 if (abs(mode)>11 || !tracks) return fSelected;
971 Int_t ntracks=tracks->GetEntries();
978 fSelected=new TObjArray(ntracks);
981 Double_t val1,val2; // Values of the observable to be tested upon
984 for (Int_t i=0; i<ntracks; i++) // Loop over all tracks of the array
986 AliTrack* tx=(AliTrack*)tracks->At(i);
990 if (nord == 0) // store the first track at the first ordered position
993 fSelected->AddAt(tx,nord-1);
997 for (Int_t j=0; j<=nord; j++) // put track in the right ordered position
999 if (j == nord) // track has smallest (mode<0) or largest (mode>0) observable value seen so far
1002 fSelected->AddAt(tx,j); // add track at the end
1003 break; // go for next track
1012 val1=tx->GetNsignals();
1013 val2=((AliTrack*)fSelected->At(j))->GetNsignals();
1016 val1=tx->GetEnergy();
1017 val2=((AliTrack*)fSelected->At(j))->GetEnergy();
1020 val1=tx->GetMomentum();
1021 val2=((AliTrack*)fSelected->At(j))->GetMomentum();
1025 val2=((AliTrack*)fSelected->At(j))->GetMass();
1029 val2=((AliTrack*)fSelected->At(j))->GetPt();
1033 val2=((AliTrack*)fSelected->At(j))->GetPl();
1037 val2=((AliTrack*)fSelected->At(j))->GetEt();
1041 val2=((AliTrack*)fSelected->At(j))->GetEl();
1045 val2=((AliTrack*)fSelected->At(j))->GetMt();
1048 val1=tx->GetRapidity();
1049 val2=((AliTrack*)fSelected->At(j))->GetRapidity();
1052 val1=tx->GetPseudoRapidity();
1053 val2=((AliTrack*)fSelected->At(j))->GetPseudoRapidity();
1057 if (mode<0 && val1 <= val2) continue;
1058 if (mode>0 && val1 >= val2) continue;
1061 for (Int_t k=nord-1; k>j; k--) // create empty position
1063 fSelected->AddAt(fSelected->At(k-1),k);
1065 fSelected->AddAt(tx,j); // put track at empty position
1066 break; // go for next track
1071 ///////////////////////////////////////////////////////////////////////////
1072 Double_t AliJet::GetDistance(AliPosition* p)
1074 // Provide distance of the current jet to the position p.
1075 // The error on the result can be obtained as usual by invoking
1076 // GetResultError() afterwards.
1078 // The distance will be provided in the unit scale of the AliPosition p.
1079 // As such it is possible to obtain a correctly computed distance even in case
1080 // the jet parameters have a different unit scale.
1081 // However, it is recommended to work always with one single unit scale.
1083 // Note : In case of incomplete information, a distance value of -1 is
1089 if (!p) return dist;
1091 // Obtain a defined position on this jet
1092 AliPosition* rx=fRef;
1094 if (!rx) return dist;
1096 Ali3Vector pj=Get3Momentum();
1098 if (pj.GetNorm() <= 0.) return dist;
1101 tj.Set3Momentum(pj);
1102 tj.SetReferencePoint(*rx);
1103 dist=tj.GetDistance(p);
1104 fDresult=tj.GetResultError();
1107 ///////////////////////////////////////////////////////////////////////////
1108 Double_t AliJet::GetDistance(AliTrack* t)
1110 // Provide distance of the current jet to the track t.
1111 // The error on the result can be obtained as usual by invoking
1112 // GetResultError() afterwards.
1114 // The distance will be provided in the unit scale of the current jet.
1115 // As such it is possible to obtain a correctly computed distance even in case
1116 // the jet and track parameters have a different unit scale.
1117 // However, it is recommended to work always with one single unit scale.
1119 // Note : In case of incomplete information, a distance value of -1 is
1125 if (!t) return dist;
1127 // Obtain a defined position on this jet
1128 AliPosition* rx=fRef;
1130 if (!rx) return dist;
1132 Ali3Vector pj=Get3Momentum();
1134 if (pj.GetNorm() <= 0.) return dist;
1137 tj.Set3Momentum(pj);
1138 tj.SetReferencePoint(*rx);
1139 dist=tj.GetDistance(t);
1140 fDresult=tj.GetResultError();
1143 ///////////////////////////////////////////////////////////////////////////
1144 Double_t AliJet::GetDistance(AliJet* j)
1146 // Provide distance of the current jet to the jet j.
1147 // The error on the result can be obtained as usual by invoking
1148 // GetResultError() afterwards.
1150 // The distance will be provided in the unit scale of the current jet.
1151 // As such it is possible to obtain a correctly computed distance even in case
1152 // the jet and track parameters have a different unit scale.
1153 // This implies that in such cases the results of j1.GetDistance(j2) and
1154 // j2.GetDistance(j1) will be numerically different.
1155 // However, it is recommended to work always with one single unit scale.
1157 // Note : In case of incomplete information, a distance value of -1 is
1163 if (!j) return dist;
1165 // Obtain a defined position on jet j
1166 AliPosition* rx=j->GetReferencePoint();
1168 if (!rx) return dist;
1170 Ali3Vector pj=j->Get3Momentum();
1172 if (pj.GetNorm() <= 0.) return dist;
1175 tj.Set3Momentum(pj);
1176 tj.SetReferencePoint(*rx);
1177 dist=GetDistance(tj);
1180 ///////////////////////////////////////////////////////////////////////////
1181 TObject* AliJet::Clone(const char* name) const
1183 // Make a deep copy of the current object and provide the pointer to the copy.
1184 // This memberfunction enables automatic creation of new objects of the
1185 // correct type depending on the object type, a feature which may be very useful
1186 // for containers when adding objects in case the container owns the objects.
1187 // This feature allows e.g. AliVertex to store either AliJet objects or
1188 // objects derived from AliJet via the AddJet memberfunction, provided
1189 // these derived classes also have a proper Clone memberfunction.
1191 AliJet* jet=new AliJet(*this);
1194 if (strlen(name)) jet->SetName(name);
1198 ///////////////////////////////////////////////////////////////////////////