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//--------------------------------------------------------------------------------------------------
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// $Id: DecayData.h,v 1.13 2009/07/13 11:00:27 loizides 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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// Authors: J.Bendavid, C.Paus
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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 "MitCommon/DataFormats/interface/Vect4M.h"
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#include "MitAna/DataTree/interface/DaughterData.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() : fMassError(0), fLxy(0), fLxyError(0),
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fDxy(0), fDxyError(0), fLz(0), fLzError(0) {}
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DecayData(const Particle *p, const FourVector &mom) : DaughterData(p), fMomAtVertex(mom),
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fMassError(0), fLxy(0), fLxyError(0), fDxy(0), fDxyError(0), fLz(0), fLzError(0) {}
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Double_t Dxy() const { return fDxy; }
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Double_t DxyError() const { return fDxyError; }
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Double_t Lxy() const { return fLxy; }
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Double_t LxyError() const { return fLxyError; }
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Double_t Lz() const { return fLz; }
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Double_t LzError() const { return fLzError; }
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Double_t MassError() const { return fMassError; }
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EObjType ObjType() const { return kDecayData; }
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const ThreeVector RelativePosition() const;
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void SetDxy(Double_t dxy) { fDxy = dxy; }
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void SetDxyError(Double_t dxyError) { fDxyError = dxyError; }
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void SetLxy(Double_t lxy) { fLxy = lxy; }
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void SetLxyError(Double_t lxyError) { fLxyError = lxyError; }
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void SetLz(Double_t lz) { fLz = lz; }
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void SetLzError(Double_t lzError) { fLzError = lzError; }
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void SetMom(Double_t px, Double_t y, Double_t z, Double_t e);
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void SetMassError(Double_t massError) { fMassError = massError; }
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protected:
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void GetMom() const;
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Vect4M fMomAtVertex; //fitted momentum at vertex
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Double32_t fMassError; //[0,0,14]fitted mass error
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Double32_t fLxy; //[0,0,14]fitted lxy
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Double32_t fLxyError; //[0,0,14]fitted lxy error
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Double32_t fDxy; //[0,0,14]fitted impact parameter
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Double32_t fDxyError; //[0,0,14]fitted impact parameter error
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Double32_t fLz; //[0,0,14]fitted lz
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Double32_t fLzError; //[0,0,14]fitted lz error
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ClassDef(DecayData, 1) // Decay data for stable daughter class
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};
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}
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//--------------------------------------------------------------------------------------------------
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inline void mithep::DecayData::GetMom() const
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{
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// Get momentum values from stored values.
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fCachedMom.SetCoordinates(fMomAtVertex.Pt(),fMomAtVertex.Eta(),
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fMomAtVertex.Phi(),fMomAtVertex.M());
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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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ClearMom();
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}
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//--------------------------------------------------------------------------------------------------
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inline const mithep::ThreeVector 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::ThreeVector dz(0,0,fLz*TMath::Abs(Pz())/Pz());
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mithep::ThreeVector momPerp(Px(),Py(),0);
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mithep::ThreeVector zHat(0,0,1.0);
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mithep::ThreeVector dxy = -momPerp.Cross(zHat)*fDxy/momPerp.R();
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mithep::ThreeVector 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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