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#ifndef Particle_H
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#define Particle_H
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#include <vector>
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#include "Math/LorentzVector.h"
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#include "Math/PtEtaPhiE4D.h"
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#include "TObject.h"
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#ifndef PI
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#define PI 3.14159265358979323846264338328
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#endif
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typedef ROOT::Math::LorentzVector< ROOT::Math::PtEtaPhiE4D< Double32_t > > LorentzVector;
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/**
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* @short generic particle class
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* @author Thomas Peiffer
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*/
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class Particle{
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public:
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/// Default constructor
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Particle(){
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m_charge=0;
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m_pt=0;
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m_eta=0;
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m_phi=0;
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m_energy=0;
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};
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/// Default destructor
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~Particle(){
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};
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/// four-momentum
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LorentzVector v4() const{
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LorentzVector v4;
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v4.SetPt(m_pt);
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v4.SetEta(m_eta);
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v4.SetPhi(m_phi);
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v4.SetE(m_energy);
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return v4;
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};
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/// charge
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float charge() const{return m_charge;}
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/// transverse momentum
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float pt() const {return m_pt;}
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/// pseudo-rapidity
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float eta() const{return m_eta;}
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/// phi
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float phi() const{return m_phi;}
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///energy
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float energy() const{return m_energy;}
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/// set charge
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void set_charge(float charge){m_charge=charge;}
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/// set transverse momentum
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void set_pt(float pt){m_pt=pt;}
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/// set pseudo-rapidity
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void set_eta(float eta){m_eta=eta;}
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/// set phi
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void set_phi(float phi){m_phi=phi;}
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/// set energy
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void set_energy(float energy){m_energy=energy;}
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/// set four-momentum
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void set_v4(LorentzVector v4){
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set_pt(v4.Pt());
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set_eta(v4.Eta());
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set_phi(v4.Phi());
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set_energy(v4.E());
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}
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/// distance in phi to particle p2
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double deltaPhi(const Particle p2) const{
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double deltaphi = fabs(this->phi() - p2.phi());
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if(deltaphi > PI) deltaphi = 2* PI - deltaphi;
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return deltaphi;
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}
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/// distance in eta-phi plane to particle p2
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double deltaR(const Particle p2) const{
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double deltaeta = this->eta() - p2.eta();
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return sqrt(deltaeta*deltaeta+deltaPhi(p2)*deltaPhi(p2));
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}
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private:
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float m_charge;
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float m_pt;
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float m_eta;
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float m_phi;
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float m_energy;
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};
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#endif
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