SignedKinematics.h

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/*
 * Copyright (C) 2002-2019 CERN for the benefit of the ATLAS collaboration
 */
 
/******************************************************************************
 * @package Trigger/TrigAlgorithms/TrigEFMissingET
 *
 * @brief Helper class to describe the kinematics of an object that can have
 * negative energies.
 * @author Jon Burr
 *****************************************************************************/
 
#ifndef TRIGEFMISSINGET_SIGNEDKINEMATICS_H
#define TRIGEFMISSINGET_SIGNEDKINEMATICS_H
 
#include "Math/Vector4D.h"
 
// Forward declares
class TLorentzVector;
 
namespace xAOD {
  class IParticle;
}
 
namespace HLT { namespace MET {

  class SignedKinematics {
    public:
      SignedKinematics();
      SignedKinematics(double px, double py, double pz, double energy);
      SignedKinematics(const TLorentzVector& tlv);
      SignedKinematics(const xAOD::IParticle& particle);
      static SignedKinematics fromEnergyEtaPhi(
          double energy, double eta, double phi);
      static SignedKinematics fromEnergyEtaPhiM(
          double energy, double eta, double phi, double mass);
      static SignedKinematics fromEtEtaPhi(
          double et, double eta, double phi);
      static SignedKinematics fromEtEtaPhiM(
          double et, double eta, double phi, double mass);

      int sign() const;

      double eta() const;
      double phi() const;
      double sinPhi() const;
      double cosPhi() const;
      double sinhEta() const;
      double coshEta() const;

      double p() const;
      double absP() const;
      double p2() const;
      double pt() const;
      double absPt() const;
      double pt2() const;
      double px() const;
      double py() const;
      double pz() const;

      double energy() const;
      double absEnergy() const;
      double energy2() const;
      double et() const;
      double absEt() const;
      double et2() const;
      double ex() const;
      double ey() const;
      double ez() const;

      double m2() const;
 
      explicit operator ROOT::Math::PxPyPzEVector() const;

      SignedKinematics& operator+=(const SignedKinematics& other);
      SignedKinematics& operator-=(const SignedKinematics& other);
    private:
      ROOT::Math::PxPyPzEVector m_p4;
  }; //> end class SignedKinematics

  SignedKinematics operator+(const SignedKinematics& lhs, const SignedKinematics& rhs);
  SignedKinematics operator-(const SignedKinematics& lhs, const SignedKinematics& rhs);
 
} } //> end namespace HLT::MET
#endif //> !TRIGEFMISSINGET_SIGNEDKINEMATICS_H