* provided "as is" without express or implied warranty. *
**************************************************************************/
-/*
-$Log$
-Revision 1.2 1999/09/29 09:24:28 fca
-Introduction of the Copyright and cvs Log
-
-*/
+// $Id$
///////////////////////////////////////////////////////////////////////////
// Class AliJet
// Creation and investigation of a jet of particle tracks.
// An AliJet can be constructed by adding AliTracks.
//
+// To provide maximal flexibility to the user, two modes of track storage
+// are provided by means of the memberfunction SetTrackCopy().
+//
+// a) SetTrackCopy(0) (which is the default).
+// Only the pointers of the 'added' tracks are stored.
+// This mode is typically used by making jet studies based on a fixed list
+// of tracks which stays under user control or is contained for instance
+// in an AliEvent.
+// In this way the AliJet just represents a 'logical structure' for the
+// physics analysis which can be embedded in e.g. an AliEvent or AliVertex.
+//
+// Note :
+// Modifications made to the original tracks also affect the AliTrack objects
+// which are stored in the AliJet.
+//
+// b) SetTrackCopy(1).
+// Of every 'added' track a private copy will be made of which the pointer
+// will be stored.
+// In this way the AliJet represents an entity on its own and modifications
+// made to the original tracks do not affect the AliTrack objects which are
+// stored in the AliJet.
+// This mode will allow 'adding' many different AliTracks into an AliJet by
+// creating only one AliTrack instance in the main programme and using the
+// AliTrack::Reset() and AliTrack parameter setting memberfunctions.
+//
+// See also the documentation provided for the memberfunction SetOwner().
+//
// Coding example to make 2 jets j1 and j2.
// ----------------------------------------
-// j1 contains the AliTracks 1 and 2
-// j2 contains the AliTracks 3 and 4
+// j1 contains the AliTracks t1 and t2
+// j2 contains 10 different AliTracks via tx
//
-// AliTrack t1,t2,t3,t4;
+// AliTrack t1,t2;
// ...
// ... // code to fill the AliTrack data
// ...
-// AliJet j1(5);
-// AliJet j2(12);
-// j1.Add(t1);
-// j1.Add(t2);
-// j2.Add(t3);
-// j2.Add(t4);
+// AliJet j1();
+// j1.AddTrack(t1);
+// j1.AddTrack(t2);
//
-// j1.Info();
-// j2.Info("sph");
+// AliJet j2();
+// j2.SetTrackCopy(1);
+// AliTrack* tx=new AliTrack();
+// for (Int_t i=0; i<10; i++)
+// {
+// ...
+// ... // code to set momentum etc... of the track tx
+// ...
+// j2.AddTrack(tx);
+// tx->Reset();
+// }
+//
+// j1.Data();
+// j2.Data("sph");
//
// Float_t e1=j1.GetEnergy();
// Float_t pnorm=j1->GetMomentum();
// Int_t ntk=j1.GetNtracks();
// AliTrack* tj=j1.GetTrack(1);
//
+// delete tx;
+//
// Note : All quantities are in GeV, GeV/c or GeV/c**2
//
//--- Author: Nick van Eijndhoven 10-jul-1997 UU-SAP Utrecht
-//- Modified: NvE 06-apr-1999 UU-SAP Utrecht to inherit from Ali4Vector
+//- Modified: NvE $Date$ UU-SAP Utrecht
///////////////////////////////////////////////////////////////////////////
#include "AliJet.h"
+#include "Riostream.h"
ClassImp(AliJet) // Class implementation to enable ROOT I/O
-AliJet::AliJet()
+AliJet::AliJet() : TNamed(),Ali4Vector()
{
// Default constructor
// All variables initialised to 0
// Initial maximum number of tracks is set to the default value
- fTracks=0;
- fNtinit=0;
+ Init();
Reset();
SetNtinit();
}
///////////////////////////////////////////////////////////////////////////
-AliJet::AliJet(Int_t n)
+void AliJet::Init()
{
-// Create a jet to hold initially a maximum of n tracks
-// All variables initialised to 0
+// Initialisation of pointers etc...
fTracks=0;
fNtinit=0;
+ fTrackCopy=0;
+ fSelected=0;
+}
+///////////////////////////////////////////////////////////////////////////
+AliJet::AliJet(Int_t n) : TNamed(),Ali4Vector()
+{
+// Create a jet to hold initially a maximum of n tracks
+// All variables initialised to 0
+ Init();
Reset();
if (n > 0)
{
AliJet::~AliJet()
{
// Default destructor
- if (fTracks) delete fTracks;
+ if (fTracks)
+ {
+ delete fTracks;
+ fTracks=0;
+ }
+ if (fSelected)
+ {
+ delete fSelected;
+ fSelected=0;
+ }
+}
+///////////////////////////////////////////////////////////////////////////
+void AliJet::SetOwner(Bool_t own)
+{
+// Set ownership of all added objects.
+// The default parameter is own=kTRUE.
+//
+// Invokation of this memberfunction also sets all the copy modes
+// (e.g. TrackCopy & co.) according to the value of own.
+//
+// This function (with own=kTRUE) is particularly useful when reading data
+// from a tree/file, since Reset() will then actually remove all the
+// added objects from memory irrespective of the copy mode settings
+// during the tree/file creation process. In this way it provides a nice way
+// of preventing possible memory leaks in the reading/analysis process.
+//
+// In addition this memberfunction can also be used as a shortcut to set all
+// copy modes in one go during a tree/file creation process.
+// However, in this case the user has to take care to only set/change the
+// ownership (and copy mode) for empty objects (e.g. newly created objects
+// or after invokation of the Reset() memberfunction) otherwise it will
+// very likely result in inconsistent destructor behaviour.
+
+ Int_t mode=1;
+ if (!own) mode=0;
+ if (fTracks) fTracks->SetOwner(own);
+ fTrackCopy=mode;
+}
+///////////////////////////////////////////////////////////////////////////
+AliJet::AliJet(const AliJet& j) : TNamed(j),Ali4Vector(j)
+{
+// Copy constructor
+ fNtinit=j.fNtinit;
+ fNtmax=j.fNtmax;
+ fQ=j.fQ;
+ fNtrk=j.fNtrk;
+ fTrackCopy=j.fTrackCopy;
+ fUserId=j.fUserId;
+
+ fSelected=0;
+
fTracks=0;
+ if (fNtrk)
+ {
+ fTracks=new TObjArray(fNtmax);
+ if (fTrackCopy) fTracks->SetOwner();
+ }
+
+ for (Int_t i=1; i<=fNtrk; i++)
+ {
+ AliTrack* tx=j.GetTrack(i);
+ if (fTrackCopy)
+ {
+ fTracks->Add(tx->Clone());
+ }
+ else
+ {
+ fTracks->Add(tx);
+ }
+ }
}
///////////////////////////////////////////////////////////////////////////
void AliJet::SetNtinit(Int_t n)
// Set the initial maximum number of tracks for this jet
fNtinit=n;
fNtmax=n;
- if (fTracks) delete fTracks;
- fTracks=new TObjArray(fNtmax);
+
+ if (fTracks)
+ {
+ delete fTracks;
+ fTracks=0;
+ }
}
///////////////////////////////////////////////////////////////////////////
void AliJet::Reset()
// The max. number of tracks is set to the initial value again
fNtrk=0;
fQ=0;
+ fUserId=0;
Double_t a[4]={0,0,0,0};
SetVector(a,"sph");
if (fNtinit > 0) SetNtinit(fNtinit);
}
///////////////////////////////////////////////////////////////////////////
-void AliJet::Add(AliTrack& t)
+void AliJet::AddTrack(AliTrack& t)
{
-// Add a track to the jet
+// Add a track to the jet.
// In case the maximum number of tracks has been reached
// space will be extended to hold an additional amount of tracks as
-// was initially reserved
+// was initially reserved.
+// See SetTrackCopy() to tailor the functionality of the stored structures.
+//
+// Note :
+// In case a private copy is made, this is performed via the Clone() memberfunction.
+// All AliTrack and derived classes have the default TObject::Clone() memberfunction.
+// However, derived classes generally contain an internal data structure which may
+// include pointers to other objects. Therefore it is recommended to provide
+// for all derived classes a specific copy constructor and override the default Clone()
+// memberfunction using this copy constructor.
+// An example for this may be seen from AliTrack.
+
+ AddTrack(t,1);
+}
+///////////////////////////////////////////////////////////////////////////
+void AliJet::AddTrack(AliTrack& t,Int_t copy)
+{
+// Internal memberfunction to actually add a track to the jet.
+// In case the maximum number of tracks has been reached
+// space will be extended to hold an additional amount of tracks as
+// was initially reserved.
+//
+// If copy=0 NO copy of the track will be made, irrespective of the setting
+// of the TrackCopy flag.
+// This allows a proper treatment of automatically generated connecting
+// tracks between vertices.
+//
+// Note :
+// In case a private copy is made, this is performed via the Clone() memberfunction.
+
+ if (!fTracks)
+ {
+ fTracks=new TObjArray(fNtmax);
+ if (fTrackCopy) fTracks->SetOwner();
+ }
if (fNtrk == fNtmax) // Check if maximum track number is reached
{
fNtmax+=fNtinit;
// Add the track to this jet
fNtrk++;
- fTracks->Add(&t);
+ if (fTrackCopy && copy)
+ {
+ fTracks->Add(t.Clone());
+ }
+ else
+ {
+ fTracks->Add(&t);
+ }
+
(*this)+=(Ali4Vector&)t;
fQ+=t.GetCharge();
+
}
///////////////////////////////////////////////////////////////////////////
-void AliJet::Info(TString f)
+void AliJet::Data(TString f)
{
// Provide jet information within the coordinate frame f
- cout << " *AliJet::Info* Invmass : " << GetInvmass() << " Charge : " << fQ
- << " Momentum : " << GetMomentum() << " Ntracks : " << fNtrk << endl;
- cout << " ";
- Ali4Vector::Info(f);
+ const char* name=GetName();
+ const char* title=GetTitle();
+
+ cout << " *AliJet::Data*";
+ if (strlen(name)) cout << " Name : " << GetName();
+ if (strlen(title)) cout << " Title : " << GetTitle();
+ cout << endl;
+ cout << " Id : " << fUserId << " Invmass : " << GetInvmass() << " Charge : " << fQ
+ << " Momentum : " << GetMomentum() << endl;
+
+ ShowTracks(0);
+
+ Ali4Vector::Data(f);
}
///////////////////////////////////////////////////////////////////////////
void AliJet::List(TString f)
{
// Provide jet and primary track information within the coordinate frame f
- Info(f); // Information of the current jet
+ Data(f); // Information of the current jet
// The tracks of this jet
AliTrack* t;
{
cout << " ---Track no. " << it << endl;
cout << " ";
- t->Info(f);
+ t->Data(f);
}
else
{
{
// Provide jet and prim.+sec. track information within the coordinate frame f
- Info(f); // Information of the current jet
+ Data(f); // Information of the current jet
// The tracks of this jet
AliTrack* t;
}
}
///////////////////////////////////////////////////////////////////////////
-Int_t AliJet::GetNtracks()
+Int_t AliJet::GetNtracks(Int_t idmode,Int_t chmode,Int_t pcode)
{
-// Return the current number of tracks of this jet
- return fNtrk;
+// Provide the number of user selected tracks in this jet based on the
+// idmode, chmode and pcode selections as specified by the user.
+// For specification of the selection parameters see GetTracks().
+// The default parameters correspond to no selection, which implies
+// that invokation of GetNtracks() just returns the total number of
+// tracks registered in this jet.
+//
+// Note : In case certain selections are specified, this function
+// invokes GetTracks(idmode,chmode,pcode) to determine the
+// number of tracks corresponding to the selections.
+// When the jet contains a large number of tracks, invokation
+// of GetTracks(idmode,chmode,pcode) and subsequently invoking
+// GetEntries() for the resulting TObjArray* might be slightly
+// faster.
+
+ Int_t n=0;
+ if (idmode==0 && chmode==2 && pcode==0)
+ {
+ return fNtrk;
+ }
+ else
+ {
+ TObjArray* arr=GetTracks(idmode,chmode,pcode);
+ n=arr->GetEntries();
+ return n;
+ }
}
///////////////////////////////////////////////////////////////////////////
Double_t AliJet::GetEnergy()
Double_t AliJet::GetMomentum()
{
// Return the value of the total jet 3-momentum
- Ali3Vector p=Get3Vector();
- Double_t p2=p.Dot(p);
- return sqrt(p2);
+// The error can be obtained by invoking GetResultError() after
+// invokation of GetMomentum().
+ Double_t norm=fV.GetNorm();
+ fDresult=fV.GetResultError();
+ return norm;
}
///////////////////////////////////////////////////////////////////////////
-Ali3Vector AliJet::Get3Momentum()
+Ali3Vector AliJet::Get3Momentum() const
{
// Return the the total jet 3-momentum
Ali3Vector p=Get3Vector();
}
}
///////////////////////////////////////////////////////////////////////////
-Float_t AliJet::GetCharge()
+Float_t AliJet::GetCharge() const
{
// Return the total charge of the jet
return fQ;
}
///////////////////////////////////////////////////////////////////////////
-AliTrack* AliJet::GetTrack(Int_t i)
+AliTrack* AliJet::GetTrack(Int_t i) const
{
// Return the i-th track of this jet
- return (AliTrack*)fTracks->At(i-1);
+
+ if (!fTracks) return 0;
+
+ if (i<=0 || i>fNtrk)
+ {
+ cout << " *AliJet*::GetTrack* Invalid argument i : " << i
+ << " Ntrk = " << fNtrk << endl;
+ return 0;
+ }
+ else
+ {
+ return (AliTrack*)fTracks->At(i-1);
+ }
+}
+///////////////////////////////////////////////////////////////////////////
+AliTrack* AliJet::GetIdTrack(Int_t id) const
+{
+// Return the track with user identifier "id" of this jet
+ if (!fTracks) return 0;
+
+ AliTrack* tx=0;
+ for (Int_t i=0; i<fNtrk; i++)
+ {
+ tx=(AliTrack*)fTracks->At(i);
+ if (id == tx->GetId()) return tx;
+ }
+ return 0; // No matching id found
+}
+///////////////////////////////////////////////////////////////////////////
+TObjArray* AliJet::GetTracks(Int_t idmode,Int_t chmode,Int_t pcode)
+{
+// Provide references to user selected tracks based on the idmode, chmode
+// and pcode selections as specified by the user.
+//
+// The following selection combinations are available :
+// ----------------------------------------------------
+// idmode = -1 ==> Select tracks with negative user identifier "id"
+// 0 ==> No selection on user identifier
+// 1 ==> Select tracks with positive user identifier "id"
+//
+// chmode = -1 ==> Select tracks with negative charge
+// 0 ==> Select neutral tracks
+// 1 ==> Select tracks with positive charge
+// 2 ==> No selection on charge
+// 3 ==> Select all charged tracks
+//
+// pcode = 0 ==> No selection on particle code
+// X ==> Select tracks with particle code +X or -X
+// This allows selection of both particles and anti-particles
+// in case of PDG particle codes.
+// Selection of either particles or anti-particles can be
+// obtained in combination with the "chmode" selector.
+//
+// Examples :
+// ----------
+// idmode=-1 chmode=0 pcode=0 : Selection of all neutral tracks with negative id.
+// idmode=0 chmode=2 pcode=211 : Selection of all charged pions (PDG convention).
+// idmode=0 chmode=1 pcode=321 : Selection of all positive kaons (PDG convention).
+//
+// The default values are idmode=0 chmode=2 pcode=0 (i.e. no selections applied).
+//
+// Notes :
+// -------
+// 1) In case the user has labeled simulated tracks with negative id and
+// reconstructed tracks with positive id, this memberfunction provides
+// easy access to either all simulated or reconstructed tracks.
+// 2) Subsequent invokations of this memberfunction with e.g. chmode=-1 and chmode=1
+// provides a convenient way to investigate particle pairs with opposite charge
+// (e.g. for invariant mass analysis).
+
+ if (fSelected)
+ {
+ fSelected->Clear();
+ }
+ else
+ {
+ fSelected=new TObjArray();
+ }
+
+ if (!fTracks) return fSelected;
+
+ AliTrack* tx=0;
+ Int_t code=0;
+ Int_t id=0;
+ Float_t q=0;
+ for (Int_t i=0; i<fNtrk; i++)
+ {
+ tx=(AliTrack*)fTracks->At(i);
+ if (!tx) continue;
+
+ code=tx->GetParticleCode();
+ if (pcode && abs(pcode)!=abs(code)) continue;
+
+ id=tx->GetId();
+ if (idmode==-1 && id>=0) continue;
+ if (idmode==1 && id<=0) continue;
+
+ q=tx->GetCharge();
+ if (chmode==-1 && q>=0) continue;
+ if (chmode==0 && fabs(q)>1e-10) continue;
+ if (chmode==1 && q<=0) continue;
+ if (chmode==3 && fabs(q)<1e-10) continue;
+
+ fSelected->Add(tx);
+ }
+
+ return fSelected;
+}
+///////////////////////////////////////////////////////////////////////////
+void AliJet::ShowTracks(Int_t mode)
+{
+// Provide an overview of the available tracks.
+// The argument mode determines the amount of information as follows :
+// mode = 0 ==> Only printout of the number of tracks
+// 1 ==> Provide a listing with 1 line of info for each track
+//
+// The default is mode=1.
+//
+ Int_t ntk=GetNtracks();
+ if (ntk)
+ {
+ if (!mode)
+ {
+ cout << " There are " << ntk << " tracks available." << endl;
+ }
+ else
+ {
+ cout << " The following " << ntk << " tracks are available :" << endl;
+ for (Int_t i=1; i<=ntk; i++)
+ {
+ AliTrack* tx=GetTrack(i);
+ if (tx)
+ {
+ const char* name=tx->GetName();
+ const char* title=tx->GetTitle();
+ cout << " Track : " << i;
+ cout << " Id : " << tx->GetId();
+ cout << " Q : " << tx->GetCharge() << " m : " << tx->GetMass() << " p : " << tx->GetMomentum();
+ if (strlen(name)) cout << " Name : " << name;
+ if (strlen(title)) cout << " Title : " << title;
+ cout << endl;
+ }
+ }
+ }
+ }
+ else
+ {
+ cout << " No tracks are present." << endl;
+ }
+}
+///////////////////////////////////////////////////////////////////////////
+Double_t AliJet::GetPt()
+{
+// Provide trans. momentum value w.r.t. z-axis.
+// The error on the value can be obtained by GetResultError()
+// after invokation of GetPt().
+ Ali3Vector v;
+ v=GetVecTrans();
+ Double_t norm=v.GetNorm();
+ fDresult=v.GetResultError();
+
+ return norm;
+}
+///////////////////////////////////////////////////////////////////////////
+Double_t AliJet::GetPl()
+{
+// Provide long. momentum value w.r.t. z-axis.
+// Note : the returned value can also be negative.
+// The error on the value can be obtained by GetResultError()
+// after invokation of GetPl().
+ Ali3Vector v;
+ v=GetVecLong();
+
+ Double_t pl=v.GetNorm();
+ fDresult=v.GetResultError();
+
+ Double_t a[3];
+ v.GetVector(a,"sph");
+ if (cos(a[1])<0) pl=-pl;
+
+ return pl;
+}
+///////////////////////////////////////////////////////////////////////////
+Double_t AliJet::GetEt()
+{
+// Provide trans. energy value w.r.t. z-axis.
+// The error on the value can be obtained by GetResultError()
+// after invokation of GetEt().
+ Double_t et=GetScaTrans();
+
+ return et;
+}
+///////////////////////////////////////////////////////////////////////////
+Double_t AliJet::GetEl()
+{
+// Provide long. energy value w.r.t. z-axis.
+// Note : the returned value can also be negative.
+// The error on the value can be obtained by GetResultError()
+// after invokation of GetEl().
+ Double_t el=GetScaLong();
+
+ return el;
+}
+///////////////////////////////////////////////////////////////////////////
+Double_t AliJet::GetMt()
+{
+// Provide transverse mass value w.r.t. z-axis.
+// The error on the value can be obtained by GetResultError()
+// after invokation of GetMt().
+ Double_t pt=GetPt();
+ Double_t dpt=GetResultError();
+ Double_t m=GetInvmass();
+ Double_t dm=GetResultError();
+
+ Double_t mt=sqrt(pt*pt+m*m);
+ Double_t dmt2=0;
+ if (mt) dmt2=(pow((pt*dpt),2)+pow((m*dm),2))/(mt*mt);
+
+ fDresult=sqrt(dmt2);
+ return mt;
+}
+///////////////////////////////////////////////////////////////////////////
+Double_t AliJet::GetRapidity()
+{
+// Provide rapidity value w.r.t. z-axis.
+// The error on the value can be obtained by GetResultError()
+// after invokation of GetRapidity().
+// Note : Also GetPseudoRapidity() is available since this class is
+// derived from Ali4Vector.
+ Double_t e=GetEnergy();
+ Double_t de=GetResultError();
+ Double_t pl=GetPl();
+ Double_t dpl=GetResultError();
+ Double_t sum=e+pl;
+ Double_t dif=e-pl;
+
+ Double_t y=9999,dy2=0;
+ if (sum && dif) y=0.5*log(sum/dif);
+
+ if (sum*dif) dy2=(1./(sum*dif))*(pow((pl*de),2)+pow((e*dpl),2));
+
+ fDresult=sqrt(dy2);
+ return y;
+}
+///////////////////////////////////////////////////////////////////////////
+void AliJet::SetTrackCopy(Int_t j)
+{
+// (De)activate the creation of private copies of the added tracks.
+// j=0 ==> No private copies are made; pointers of original tracks are stored.
+// j=1 ==> Private copies of the tracks are made and these pointers are stored.
+//
+// Note : Once the storage contains pointer(s) to AliTrack(s) one cannot
+// change the TrackCopy mode anymore.
+// To change the TrackCopy mode for an existing AliJet containing
+// tracks one first has to invoke Reset().
+ if (!fTracks)
+ {
+ if (j==0 || j==1)
+ {
+ fTrackCopy=j;
+ }
+ else
+ {
+ cout << "*AliJet::SetTrackCopy* Invalid argument : " << j << endl;
+ }
+ }
+ else
+ {
+ cout << "*AliJet::SetTrackCopy* Storage already contained tracks."
+ << " ==> TrackCopy mode not changed." << endl;
+ }
+}
+///////////////////////////////////////////////////////////////////////////
+Int_t AliJet::GetTrackCopy() const
+{
+// Provide value of the TrackCopy mode.
+// 0 ==> No private copies are made; pointers of original tracks are stored.
+// 1 ==> Private copies of the tracks are made and these pointers are stored.
+ return fTrackCopy;
+}
+///////////////////////////////////////////////////////////////////////////
+void AliJet::SetId(Int_t id)
+{
+// Set a user defined identifier for this jet.
+ fUserId=id;
+}
+///////////////////////////////////////////////////////////////////////////
+Int_t AliJet::GetId() const
+{
+// Provide the user defined identifier of this jet.
+ return fUserId;
+}
+///////////////////////////////////////////////////////////////////////////
+TObject* AliJet::Clone(const char* name) const
+{
+// Make a deep copy of the current object and provide the pointer to the copy.
+// This memberfunction enables automatic creation of new objects of the
+// correct type depending on the object type, a feature which may be very useful
+// for containers when adding objects in case the container owns the objects.
+// This feature allows e.g. AliVertex to store either AliJet objects or
+// objects derived from AliJet via the AddJet memberfunction, provided
+// these derived classes also have a proper Clone memberfunction.
+
+ AliJet* jet=new AliJet(*this);
+ if (name)
+ {
+ if (strlen(name)) jet->SetName(name);
+ }
+ return jet;
}
///////////////////////////////////////////////////////////////////////////
git://git.uio.no / u / mrichter / AliRoot.git / blobdiff