columnar::Detail::FullMomentumAccessorsPtEtaPhiM< CoreAccessors > Class Template Reference

generic columnar momentum accessors that use a pt, eta, phi, m representation underneath More...

#include <MomentumAccessors.h>

Inheritance diagram for columnar::Detail::FullMomentumAccessorsPtEtaPhiM< CoreAccessors >:

Collaboration diagram for columnar::Detail::FullMomentumAccessorsPtEtaPhiM< CoreAccessors >:

Public Types
using	CI = CoreAccessors::CI
using	CM = typename CoreAccessors::CM

Public Member Functions
double	e (ObjectId< CI, CM > object) const
double	rapidity (ObjectId< CI, CM > object) const

Detailed Description

template<typename CoreAccessors>
class columnar::Detail::FullMomentumAccessorsPtEtaPhiM< CoreAccessors >

generic columnar momentum accessors that use a pt, eta, phi, m representation underneath

This takes a template parameter for the implementation of a class that provides the accessors for pt, eta, phi, and m. That then allows to specialize it for different particle types which may have different implementations of the pt, eta, phi, and m accessors. Particularly m is different for each particle, but some particles may also vary other implementations, e.g. calorimeter eta for electrons and photons, or dressed properties for jets.

Definition at line 124 of file MomentumAccessors.h.

Member Typedef Documentation

CI

template<typename CoreAccessors>

using columnar::Detail::FullMomentumAccessorsPtEtaPhiM< CoreAccessors >::CI = CoreAccessors::CI

Definition at line 127 of file MomentumAccessors.h.

CM

template<typename CoreAccessors>

using columnar::Detail::FullMomentumAccessorsPtEtaPhiM< CoreAccessors >::CM = typename CoreAccessors::CM

Definition at line 128 of file MomentumAccessors.h.

Member Function Documentation

e()

template<typename CoreAccessors>

double columnar::Detail::FullMomentumAccessorsPtEtaPhiM< CoreAccessors >::e ( ObjectId< CI, CM > object ) const

inline

Definition at line 132 of file MomentumAccessors.h.

      {
        const double myPt = this->pt (object);
        const double myEta = this->eta (object);
        const double myM = this->m (object);
 
        // not reading phi, not part of the energy calculation
        const ROOT::Math::LorentzVector<ROOT::Math::PtEtaPhiM4D<double>> myP4 {myPt, myEta, 0, myM};
        return myP4.energy();
      }

rapidity()

template<typename CoreAccessors>

double columnar::Detail::FullMomentumAccessorsPtEtaPhiM< CoreAccessors >::rapidity ( ObjectId< CI, CM > object ) const

inline

Definition at line 143 of file MomentumAccessors.h.

      {
        const double myEta = this->eta(object);
        const double myM = this->m(object);
        if (myM == 0)
          return myEta; // for massless particles, rapidity is the same as eta
        const double myPt = this->pt(object);
 
        // not reading phi, not part of the rapidity calculation
        const ROOT::Math::LorentzVector<ROOT::Math::PtEtaPhiM4D<double>> myP4 {myPt, myEta, 0, myM};
        return myP4.Rapidity();
      }

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The documentation for this class was generated from the following file:

• MomentumAccessors.h