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//--------------------------------------------------------------------------------------------------
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// $Id: DecayData.h,v 1.1 2008/09/19 11:58:02 bendavid Exp $
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//
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// DecayData
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//
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// Additional information on a stable daughter which is specific to a particular decay
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//
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//
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// Authors: J.Bendavid
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//--------------------------------------------------------------------------------------------------
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#ifndef MITANA_DATATREE_DECAYDATA_H
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#define MITANA_DATATREE_DECAYDATA_H
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#include "MitAna/DataTree/interface/StableParticle.h"
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#include "MitAna/DataTree/interface/DaughterData.h"
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#include "MitAna/DataTree/interface/Types.h"
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namespace mithep
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{
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class DecayData : public DaughterData
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{
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public:
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DecayData() {}
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DecayData(Particle *p, const FourVector32 &mom) :
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DaughterData(p),
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fMomAtVertex(mom) {}
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virtual ~DecayData() {}
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Double32_t Px() const { return fMomAtVertex.Px(); }
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Double32_t Py() const { return fMomAtVertex.Py(); }
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Double32_t Pz() const { return fMomAtVertex.Pz(); }
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Double32_t P() const { return fMomAtVertex.P(); }
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Double32_t E() const { return fMomAtVertex.E(); }
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FourVector Mom() const { return fMomAtVertex; }
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void SetMom(Double32_t px, Double32_t y, Double32_t z, Double32_t e);
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void SetMom(const FourVector &mom) { fMomAtVertex = mom; }
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const ThreeVector32 RelativePosition() const;
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// Fitted Mass Error
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Double32_t MassError() const { return fMassError; }
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void SetMassError(Double32_t massError) { fMassError = massError;}
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// Lxy
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Double32_t Lxy() const { return fLxy; }
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void SetLxy(Double32_t lxy) { fLxy = lxy;}
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// Lxy Error
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Double32_t LxyError() const { return fLxyError; }
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void SetLxyError(Double32_t lxyError) { fLxyError = lxyError;}
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// Dxy (two dimensional impact parameter)
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Double32_t Dxy() const { return fDxy; }
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void SetDxy(Double32_t dxy) { fDxy = dxy;}
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// Dxy Error
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Double32_t DxyError() const { return fDxyError; }
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void SetDxyError(Double32_t dxyError) { fDxyError = dxyError;}
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// Lz
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Double32_t Lz() const { return fLz; }
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void SetLz(Double32_t lz) { fLz = lz;}
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// Lz Error
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Double32_t LzError() const { return fLzError; }
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void SetLzError(Double32_t lzError) { fLzError = lzError;}
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protected:
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FourVector32 fMomAtVertex; //fitted momentum at vertex
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Double32_t fMassError;
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Double32_t fLxy;
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Double32_t fLxyError;
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Double32_t fDxy;
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Double32_t fDxyError;
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Double32_t fLz;
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Double32_t fLzError;
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ClassDef(DecayData, 1) // Stable daughter class
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};
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}
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//--------------------------------------------------------------------------------------------------
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inline void mithep::DecayData::SetMom(Double32_t px, Double32_t py, Double32_t pz, Double32_t e)
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{
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// Set four momentum.
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fMomAtVertex.SetXYZT(px, py, pz, e);
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}
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//--------------------------------------------------------------------------------------------------
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inline const mithep::ThreeVector32 mithep::DecayData::RelativePosition() const
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{
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//compute the position vector of the decay vertex relative to the parent decay vertex
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mithep::ThreeVector32 dz(0,0,fLz*TMath::Abs(fMomAtVertex.Pz())/fMomAtVertex.Pz());
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mithep::ThreeVector32 momPerp(fMomAtVertex.Px(),fMomAtVertex.Py(),0);
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mithep::ThreeVector32 zHat(0,0,1.0);
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mithep::ThreeVector32 dxy = -momPerp.Cross(zHat)*fDxy/momPerp.R();
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mithep::ThreeVector32 dlxy = momPerp*fLxy/momPerp.R();
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return (dxy+dlxy+dz);
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}
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#endif
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