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//--------------------------------------------------------------------------------------------------
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// $Id: Particle.h,v 1.32 2009/05/18 06:28:49 loizides Exp $
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//
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// Particle
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//
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// General particle class. It provides an abstract interface to kinematical quantities
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// computed by derived classes.
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//
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// Authors: C.Loizides
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//--------------------------------------------------------------------------------------------------
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#ifndef MITANA_DATATREE_PARTICLE_H
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#define MITANA_DATATREE_PARTICLE_H
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#include <TMath.h>
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#include "MitAna/DataCont/interface/CacheFlag.h"
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#include "MitAna/DataTree/interface/DataObject.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 Particle : public DataObject
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{
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public:
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Particle() {}
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Double_t AbsEta() const { return TMath::Abs(Eta()); }
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Double_t Charge() const;
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Int_t Compare(const TObject *o) const;
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Double_t E() const { return Mom().E(); }
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Double_t Et() const;
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Double_t Eta() const { return Mom().Eta(); }
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Bool_t IsSortable() const { return kTRUE; }
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Double_t Mass() const { return Mom().M(); }
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Double_t Mt() const { return Mom().Mt(); }
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const FourVectorM &Mom() const;
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EObjType ObjType() const { return kParticle; }
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Double_t Phi() const { return Mom().Phi(); }
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Double_t PhiDeg() const { return Phi() * 180 /TMath::Pi(); }
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void Print(Option_t *opt="") const;
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Double_t Pt() const { return Mom().Pt(); }
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Double_t Px() const { return Mom().Px(); }
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Double_t Py() const { return Mom().Py(); }
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Double_t Pz() const { return Mom().Pz(); }
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Double_t P() const { return Mom().P(); }
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Double_t Rapidity() const { return Mom().Rapidity(); }
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Double_t Theta() const { return Mom().Theta(); }
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Double_t TMass() const;
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protected:
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void ClearCharge() const { fCacheQFlag.ClearCache(); }
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void ClearMom() const { fCacheMomFlag.ClearCache(); }
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virtual Double_t GetCharge() const { return 0; }
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virtual Double_t GetMass() const { return 0; }
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virtual void GetMom() const = 0;
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mutable CacheFlag fCacheMomFlag; //||cache validity flag for momentum
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mutable CacheFlag fCacheQFlag; //||cache validity flag for charge
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mutable FourVectorM fCachedMom; //!cached momentum vector (filled by derived classes)
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mutable Double_t fCachedQ; //!chached charge value (filled by derived classes)
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ClassDef(Particle, 1) // Generic particle class
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};
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}
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//--------------------------------------------------------------------------------------------------
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inline Double_t mithep::Particle::Charge() const
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{
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// Return cached charge value.
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if (!fCacheQFlag.IsValid()) {
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fCachedQ = GetCharge();
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fCacheQFlag.SetValid();
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}
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return fCachedQ;
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}
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//--------------------------------------------------------------------------------------------------
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inline Int_t mithep::Particle::Compare(const TObject *o) const
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{
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// Default compare function for sorting according to transverse momentum.
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// Returns -1 if this object is smaller than given object, 0 if objects are
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// equal and 1 if this is larger than given object.
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const mithep::Particle *p = dynamic_cast<const mithep::Particle *>(o);
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if (!p)
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return 1;
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Double_t mypt = Pt();
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Double_t pt = p->Pt();
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if (mypt>pt)
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return -1;
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else if (pt>mypt)
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return +1;
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return 0;
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}
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//--------------------------------------------------------------------------------------------------
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inline Double_t mithep::Particle::Et() const
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{
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// Return transverse energy.
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return E()*Pt()/P();
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}
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//--------------------------------------------------------------------------------------------------
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inline const mithep::FourVectorM &mithep::Particle::Mom() const
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{
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// Return cached momentum value.
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if (!fCacheMomFlag.IsValid()) {
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GetMom();
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fCacheMomFlag.SetValid();
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}
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return fCachedMom;
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}
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//--------------------------------------------------------------------------------------------------
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inline Double_t mithep::Particle::TMass() const
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{
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// Return transverse mass.
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return Mass()*Pt()/P();
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}
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#endif
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