DataTree/interface/DecayParticle.h

//--------------------------------------------------------------------------------------------------
// $Id: DecayParticle.h,v 1.22 2009/02/17 15:09:45 bendavid Exp $
//
// DecayParticle
//
// The decay particle class is for use in vertexing based analyses. It
// stores vertex fit information (including four momentum) and links to daughters.
//
// Note that Charge() is still computed as a recursive loop over daughters, as inherited from
// CompositeParticle, but momentum is returned from the internally stored four vector.
//
// Authors: C.Paus, J.Bendavid
//--------------------------------------------------------------------------------------------------

#ifndef MITANA_DATATREE_DECAYPARTICLE_H
#define MITANA_DATATREE_DECAYPARTICLE_H
 
#include "MitAna/DataTree/interface/Types.h"
#include "MitAna/DataTree/interface/CompositeParticle.h"
#include "MitAna/DataTree/interface/DaughterData.h"
#include "MitAna/DataTree/interface/Vertex.h"
#include "MitAna/DataCont/interface/RefArray.h"
#include <TDatabasePDG.h>
#include <TParticlePDG.h> 

namespace mithep 
{
  class DecayParticle : public Particle
  {
    public:
      DecayParticle() :
        fAbsPdgId(0), fChi2(0), fNdof(0), fMassError(0), 
        fLxy(0), fLxyError(0), fDxy(0), fDxyError(0), fLz(0), fLzError(0) {}
      DecayParticle(Int_t absPdgId) : 
        fAbsPdgId(absPdgId), fChi2(0), fNdof(0), fMassError(0), 
        fLxy(0), fLxyError(0), fDxy(0), fDxyError(0), fLz(0), fLzError(0) {}

      UInt_t                    AbsPdgId()            const { return fAbsPdgId;                  }
      Double_t                  Chi2()                const { return fChi2;                      }
      const Particle           *Daughter(UInt_t i)    const { return DaughterDat(i)->Original(); }
      const DaughterData       *DaughterDat(UInt_t i) const { return fDaughterData.At(i);        }
      Double_t                  Dxy()                 const { return fDxy;                       }
      Double_t                  DxyError()            const { return fDxyError;                  }
      Bool_t                    HasDaughter(const Particle *p)            const;
      Bool_t                    HasCommonDaughter(const DecayParticle *p) const;
      Bool_t                    HasSameDaughters(const DecayParticle *p)  const;
      Bool_t                    HasPriVertex()        const { return fPriVtx.IsValid();          }
      Bool_t                    HasPriVertex(const Vertex *v) 
                                                      const { return fPriVtx.RefsObject(v);      }
      Double_t                  Lxy()                 const { return fLxy;       }
      Double_t                  LxyError()            const { return fLxyError;  }
      Double_t                  MassError()           const { return fMassError; }
      UInt_t                    Ndof()                const { return fNdof;      }
      Double_t                  Lz()                  const { return fLz;        }
      Double_t                  LzError()             const { return fLzError;   }
      UInt_t                    NDaughters()          const { return fDaughterData.Entries();    }
      EObjType                  ObjType()             const { return kDecayParticle;             }
      TParticlePDG             *ParticlePdgEntry()    const;
      Double_t                  PdgMass()             const;
      Double_t                  Prob()                const { return TMath::Prob(fChi2,fNdof);   }
      const ThreeVector         Position()            const;
      const ThreeVector         RelativePosition()    const;
      const Vertex             *PriVertex()           const { return fPriVtx.Obj();              }
      void                      AddDaughterData(const DaughterData *dd) { fDaughterData.Add(dd); }
      void                      SetAbsPdgId(UInt_t apid)                { fAbsPdgId=apid;        }
      void                      SetChi2(Double_t chi2)                  { fChi2 = chi2;          }
      void                      SetMassError(Double_t massError)        { fMassError = massError;}
      void                      SetMom(Double_t px, Double_t py, Double_t pz, Double_t e);
      void                      SetMom(const FourVector &p)             { fMomentum = p;         }
      void                      SetNdof(UInt_t   ndof)                  { fNdof = ndof;          }
      void                      SetDxy(Double_t dxy)                    { fDxy = dxy;            }
      void                      SetDxyError(Double_t dxyError)          { fDxyError = dxyError;  }
      void                      SetLxy(Double_t lxy)                    { fLxy = lxy;            }
      void                      SetLxyError(Double_t lxyError)          { fLxyError = lxyError;  }
      void                      SetLz(Double_t lz)                      { fLz = lz;              }
      void                      SetLzError(Double_t lzError)            { fLzError = lzError;    }
      void                      SetPriVertex(const Vertex *v)           { fPriVtx = v;           }
      using TObject::Error;

    protected:
      Double_t                  GetCharge()           const;
      void                      GetMom()              const;

      UInt_t                    fAbsPdgId;     //absolute value of pid code
      Double32_t                fChi2;         //chi-squared of fit
      UInt_t                    fNdof;         //degrees of freedom for fit
      Double32_t                fMassError;    //fitted mass error
      Double32_t                fLxy;          //fitted lxy (decay length)
      Double32_t                fLxyError;     //fitted lxy error
      Double32_t                fDxy;          //fitted impact parameter
      Double32_t                fDxyError;     //fitted impact parameter error
      Double32_t                fLz;           //fitted lz (decay length)
      Double32_t                fLzError;      //fitted lz error
      FourVectorM32             fMomentum;     //momentum fourvector
      RefArray<DaughterData,32> fDaughterData; //momentum of daughters at vertex
      Ref<Vertex>               fPriVtx;    //reference to primary vertex
      
      ClassDef(DecayParticle, 1) // Decay particle class
  };
}

//--------------------------------------------------------------------------------------------------
inline Double_t mithep::DecayParticle::GetCharge() const 
{
  // Return sum of charge of daughter particles.

  Double_t charge = 0;
  for (UInt_t i=0; i<NDaughters(); ++i)
    charge += DaughterDat(i)->Charge();
  
  return charge;
}

//--------------------------------------------------------------------------------------------------
inline void mithep::DecayParticle::GetMom() const
{
  // Get momentum values from stored values.

  fCachedMom.SetCoordinates(fMomentum.Pt(),fMomentum.Eta(),
                            fMomentum.Phi(),fMomentum.M()); 
}

//--------------------------------------------------------------------------------------------------
inline TParticlePDG *mithep::DecayParticle::ParticlePdgEntry() const 
{ 
  // Return entry to pdg database for the particle.

  return TDatabasePDG::Instance()->GetParticle(fAbsPdgId); 
}

//--------------------------------------------------------------------------------------------------
inline void mithep::DecayParticle::SetMom(Double_t px, Double_t py, Double_t pz, Double_t e)
{ 
  // Set four vector.

  fMomentum.SetXYZT(px,py,pz,e);
}

//--------------------------------------------------------------------------------------------------
inline const mithep::ThreeVector mithep::DecayParticle::Position() const
{
  // Return absolute position of decay.

  const mithep::Vertex *pv = PriVertex();
    
  if (pv)
    return ( pv->Position() + RelativePosition() );
  else
    return RelativePosition();
}

//--------------------------------------------------------------------------------------------------
inline const mithep::ThreeVector mithep::DecayParticle::RelativePosition() const
{
  // Compute the position vector of the decay vertex relative to the primary vertex.

  mithep::ThreeVector dz(0,0,fLz*TMath::Abs(fMomentum.Pz())/fMomentum.Pz());
  mithep::ThreeVector momPerp(fMomentum.Px(),fMomentum.Py(),0);
  mithep::ThreeVector zHat(0,0,1.0);
  mithep::ThreeVector dxy   = -momPerp.Cross(zHat)*fDxy/momPerp.R();
  mithep::ThreeVector dlxy  =  momPerp*fLxy/momPerp.R();
  return (dxy+dlxy+dz);
}

#endif
Revision:	1.23
Committed:	Wed Feb 18 15:38:54 2009 UTC (16 years, 2 months ago) by loizides
Content type:	text/plain
Branch:	MAIN
Changes since 1.22:	+47 -24 lines
Log Message:	Reworked particle interface to cache FourVectorM
#	User	Rev	Content
1	loizides	1.1	//--------------------------------------------------------------------------------------------------
2	loizides	1.23	// $Id: DecayParticle.h,v 1.22 2009/02/17 15:09:45 bendavid Exp $
3	loizides	1.1	//
4	loizides	1.20	// DecayParticle
5	loizides	1.1	//
6	loizides	1.20	// The decay particle class is for use in vertexing based analyses. It
7			// stores vertex fit information (including four momentum) and links to daughters.
8	loizides	1.1	//
9	loizides	1.20	// Note that Charge() is still computed as a recursive loop over daughters, as inherited from
10			// CompositeParticle, but momentum is returned from the internally stored four vector.
11	bendavid	1.10	//
12	loizides	1.14	// Authors: C.Paus, J.Bendavid
13	loizides	1.1	//--------------------------------------------------------------------------------------------------
14
15	loizides	1.21	#ifndef MITANA_DATATREE_DECAYPARTICLE_H
16			#define MITANA_DATATREE_DECAYPARTICLE_H
17	loizides	1.1
18	loizides	1.20	#include "MitAna/DataTree/interface/Types.h"
19	loizides	1.1	#include "MitAna/DataTree/interface/CompositeParticle.h"
20	bendavid	1.11	#include "MitAna/DataTree/interface/DaughterData.h"
21	bendavid	1.13	#include "MitAna/DataTree/interface/Vertex.h"
22			#include "MitAna/DataCont/interface/RefArray.h"
23	loizides	1.20	#include <TDatabasePDG.h>
24			#include <TParticlePDG.h>
25
26	loizides	1.1	namespace mithep
27			{
28	bendavid	1.13	class DecayParticle : public Particle
29	loizides	1.1	{
30			public:
31	loizides	1.23	DecayParticle() :
32			fAbsPdgId(0), fChi2(0), fNdof(0), fMassError(0),
33			fLxy(0), fLxyError(0), fDxy(0), fDxyError(0), fLz(0), fLzError(0) {}
34	loizides	1.20	DecayParticle(Int_t absPdgId) :
35	loizides	1.23	fAbsPdgId(absPdgId), fChi2(0), fNdof(0), fMassError(0),
36			fLxy(0), fLxyError(0), fDxy(0), fDxyError(0), fLz(0), fLzError(0) {}
37	bendavid	1.7
38	loizides	1.20	UInt_t AbsPdgId() const { return fAbsPdgId; }
39			Double_t Chi2() const { return fChi2; }
40			const Particle *Daughter(UInt_t i) const { return DaughterDat(i)->Original(); }
41			const DaughterData *DaughterDat(UInt_t i) const { return fDaughterData.At(i); }
42			Double_t Dxy() const { return fDxy; }
43			Double_t DxyError() const { return fDxyError; }
44			Bool_t HasDaughter(const Particle *p) const;
45			Bool_t HasCommonDaughter(const DecayParticle *p) const;
46			Bool_t HasSameDaughters(const DecayParticle *p) const;
47	loizides	1.23	Bool_t HasPriVertex() const { return fPriVtx.IsValid(); }
48			Bool_t HasPriVertex(const Vertex *v)
49			const { return fPriVtx.RefsObject(v); }
50	loizides	1.20	Double_t Lxy() const { return fLxy; }
51			Double_t LxyError() const { return fLxyError; }
52			Double_t MassError() const { return fMassError; }
53			UInt_t Ndof() const { return fNdof; }
54			Double_t Lz() const { return fLz; }
55			Double_t LzError() const { return fLzError; }
56			UInt_t NDaughters() const { return fDaughterData.Entries(); }
57			EObjType ObjType() const { return kDecayParticle; }
58			TParticlePDG *ParticlePdgEntry() const;
59			Double_t PdgMass() const;
60			Double_t Prob() const { return TMath::Prob(fChi2,fNdof); }
61			const ThreeVector Position() const;
62			const ThreeVector RelativePosition() const;
63	loizides	1.23	const Vertex *PriVertex() const { return fPriVtx.Obj(); }
64	loizides	1.20	void AddDaughterData(const DaughterData *dd) { fDaughterData.Add(dd); }
65	loizides	1.23	void SetAbsPdgId(UInt_t apid) { fAbsPdgId=apid; }
66			void SetChi2(Double_t chi2) { fChi2 = chi2; }
67			void SetMassError(Double_t massError) { fMassError = massError;}
68	loizides	1.20	void SetMom(Double_t px, Double_t py, Double_t pz, Double_t e);
69	loizides	1.23	void SetMom(const FourVector &p) { fMomentum = p; }
70			void SetNdof(UInt_t ndof) { fNdof = ndof; }
71			void SetDxy(Double_t dxy) { fDxy = dxy; }
72			void SetDxyError(Double_t dxyError) { fDxyError = dxyError; }
73			void SetLxy(Double_t lxy) { fLxy = lxy; }
74			void SetLxyError(Double_t lxyError) { fLxyError = lxyError; }
75			void SetLz(Double_t lz) { fLz = lz; }
76			void SetLzError(Double_t lzError) { fLzError = lzError; }
77			void SetPriVertex(const Vertex *v) { fPriVtx = v; }
78	loizides	1.12	using TObject::Error;
79	loizides	1.20
80	loizides	1.1	protected:
81	loizides	1.23	Double_t GetCharge() const;
82			void GetMom() const;
83
84	loizides	1.20	UInt_t fAbsPdgId; //absolute value of pid code
85			Double32_t fChi2; //chi-squared of fit
86			UInt_t fNdof; //degrees of freedom for fit
87			Double32_t fMassError; //fitted mass error
88			Double32_t fLxy; //fitted lxy (decay length)
89			Double32_t fLxyError; //fitted lxy error
90			Double32_t fDxy; //fitted impact parameter
91			Double32_t fDxyError; //fitted impact parameter error
92			Double32_t fLz; //fitted lz (decay length)
93			Double32_t fLzError; //fitted lz error
94			FourVectorM32 fMomentum; //momentum fourvector
95	bendavid	1.16	RefArray<DaughterData,32> fDaughterData; //momentum of daughters at vertex
96	loizides	1.23	Ref<Vertex> fPriVtx; //reference to primary vertex
97	loizides	1.1
98	loizides	1.20	ClassDef(DecayParticle, 1) // Decay particle class
99	loizides	1.1	};
100			}
101	bendavid	1.7
102			//--------------------------------------------------------------------------------------------------
103	loizides	1.23	inline Double_t mithep::DecayParticle::GetCharge() const
104			{
105			// Return sum of charge of daughter particles.
106
107			Double_t charge = 0;
108			for (UInt_t i=0; i<NDaughters(); ++i)
109			charge += DaughterDat(i)->Charge();
110
111			return charge;
112			}
113
114			//--------------------------------------------------------------------------------------------------
115			inline void mithep::DecayParticle::GetMom() const
116			{
117			// Get momentum values from stored values.
118
119			fCachedMom.SetCoordinates(fMomentum.Pt(),fMomentum.Eta(),
120			fMomentum.Phi(),fMomentum.M());
121			}
122
123			//--------------------------------------------------------------------------------------------------
124	bendavid	1.7	inline TParticlePDG *mithep::DecayParticle::ParticlePdgEntry() const
125			{
126	loizides	1.20	// Return entry to pdg database for the particle.
127	bendavid	1.7
128			return TDatabasePDG::Instance()->GetParticle(fAbsPdgId);
129			}
130	bendavid	1.8
131			//--------------------------------------------------------------------------------------------------
132			inline void mithep::DecayParticle::SetMom(Double_t px, Double_t py, Double_t pz, Double_t e)
133			{
134	loizides	1.20	// Set four vector.
135	bendavid	1.8
136	bendavid	1.11	fMomentum.SetXYZT(px,py,pz,e);
137			}
138
139			//--------------------------------------------------------------------------------------------------
140	bendavid	1.13	inline const mithep::ThreeVector mithep::DecayParticle::Position() const
141			{
142	loizides	1.20	// Return absolute position of decay.
143	bendavid	1.13
144			const mithep::Vertex *pv = PriVertex();
145
146			if (pv)
147			return ( pv->Position() + RelativePosition() );
148			else
149			return RelativePosition();
150			}
151
152			//--------------------------------------------------------------------------------------------------
153			inline const mithep::ThreeVector mithep::DecayParticle::RelativePosition() const
154			{
155	loizides	1.20	// Compute the position vector of the decay vertex relative to the primary vertex.
156	bendavid	1.13
157			mithep::ThreeVector dz(0,0,fLz*TMath::Abs(fMomentum.Pz())/fMomentum.Pz());
158			mithep::ThreeVector momPerp(fMomentum.Px(),fMomentum.Py(),0);
159			mithep::ThreeVector zHat(0,0,1.0);
160	paus	1.17	mithep::ThreeVector dxy = -momPerp.Cross(zHat)*fDxy/momPerp.R();
161			mithep::ThreeVector dlxy = momPerp*fLxy/momPerp.R();
162	bendavid	1.13	return (dxy+dlxy+dz);
163			}
164
165	loizides	1.1	#endif