Representation of particles from a HepMC::GenEvent. More...

#include <Particle.hh>

Inheritance diagram for Particle:

Collaboration diagram for Particle:

Public Member Functions
	Particle ()
	Particle (PdgId pid, const FourMomentum &mom)
	Constructor without GenParticle.
	Particle (const GenParticle &gp)
	Constructor from a HepMC GenParticle.
const GenParticle &	genParticle () const
	Get a const reference to the original GenParticle.
bool	hasGenParticle () const
	Check if the particle corresponds to a GenParticle.
PdgId	pdgId () const
	The PDG ID code for this Particle.
Particle &	setMomentum (const FourMomentum &momentum)
	Set the momentum of this Particle.
const FourMomentum &	momentum () const
	The momentum of this Particle.
double	energy () const
	The energy of this Particle.
double	mass () const
	The mass of this Particle.
bool	hasAncestor (PdgId pdg_id) const
	Check whether a given PID is found in the GenParticle's ancestor list.
Private Attributes
const GenParticle *	_original
	A pointer to the original GenParticle from which this Particle is projected.
PdgId	_id
	The PDG ID code for this Particle.
FourMomentum	_momentum
	The momentum of this projection of the Particle.

Detailed Description

Representation of particles from a HepMC::GenEvent.

Definition at line 16 of file Particle.hh.

Constructor & Destructor Documentation

Particle ( ) [inline]

Default constructor.

Deprecated:: A particle without info is useless. This only exists to keep STL containers happy.

Definition at line 21 of file Particle.hh.

      : ParticleBase(),
        _original(0), _id(0), _momentum()
    { }

Particle	(	PdgId	pid,
		const FourMomentum &	mom
	)		`[inline]`

Constructor without GenParticle.

Definition at line 27 of file Particle.hh.

      : ParticleBase(),
        _original(0), _id(pid), _momentum(mom)
    { }

Particle ( const GenParticle & gp ) [inline]

Constructor from a HepMC GenParticle.

Definition at line 33 of file Particle.hh.

      : ParticleBase(),
        _original(&gp), _id(gp.pdg_id()),
        _momentum(gp.momentum())
    { }

Member Function Documentation

double energy ( ) const [inline]

The energy of this Particle.

Definition at line 73 of file Particle.hh.

References FourMomentum::E(), and Particle::momentum().

                          {
      return momentum().E();
    }

const GenParticle& genParticle ( ) const [inline]

Get a const reference to the original GenParticle.

Definition at line 43 of file Particle.hh.

References Particle::_original.

Referenced by FinalState::accept(), BABAR_2005_S6181155::analyze(), BELLE_2001_S4598261::analyze(), BELLE_2006_S6265367::analyze(), ARGUS_1993_S2653028::analyze(), BABAR_2007_S7266081::analyze(), ARGUS_1993_S2789213::analyze(), ARGUS_1993_S2669951::analyze(), H1_1994_S2919893::analyze(), ATLAS_2011_S8994773::analyze(), CDF_2008_S7540469::analyze(), D0_2010_S8570965::analyze(), ATLAS_2010_S8894728::analyze(), InvMassFinalState::calc(), Jet::containsBottom(), Jet::containsCharm(), Jet::containsParticle(), ATLAS_2011_I944826::daughtersSurviveCuts(), LHCB_2010_S8758301::getLongestLivedAncestor(), LHCB_2011_I917009::getMotherLifeTimeSum(), ATLAS_2011_I944826::getPerpFlightDistance(), Particle::hasAncestor(), hasDecayedTo(), MergedFinalState::project(), and DISFinalState::project().

                                           {
      assert(_original);
      return *_original;
    }

bool hasAncestor ( PdgId pdg_id ) const

Check whether a given PID is found in the GenParticle's ancestor list.

Definition at line 7 of file Particle.cc.

References Particle::genParticle(), and Rivet::particles().

Referenced by ALICE_2011_S8909580::analyze(), ALICE_2011_S8945144::analyze(), and CMS_2011_S8978280::analyze().

                                               {
    GenVertex* prodVtx = genParticle().production_vertex();
    if (prodVtx == 0) return false;
    foreach (const GenParticle* ancestor, particles(prodVtx, HepMC::ancestors)) {
      if (ancestor->pdg_id() == pdg_id) return true;
    }
    return false;
  }

bool hasGenParticle ( ) const [inline]

Check if the particle corresponds to a GenParticle.

Definition at line 50 of file Particle.hh.

References Particle::_original.

Referenced by FinalState::accept(), LHCB_2010_S8758301::getLongestLivedAncestor(), LHCB_2011_I917009::getMotherLifeTimeSum(), and DISLepton::project().

                                {
      return bool(_original);
    }

double mass ( ) const [inline]

The mass of this Particle.

Definition at line 78 of file Particle.hh.

References FourMomentum::mass(), and Particle::momentum().

Referenced by ALICE_2011_S8945144::analyze().

                        {
      return momentum().mass();
    }

const FourMomentum& momentum ( ) const [inline, virtual]

The momentum of this Particle.

Implements ParticleBase.

Definition at line 68 of file Particle.hh.

References Particle::_momentum.

                                         {
      return _momentum;
    }

PdgId pdgId ( ) const [inline]

The PDG ID code for this Particle.

Definition at line 56 of file Particle.hh.

References Particle::_id.

                        {
      return _id;
    }

Particle& setMomentum ( const FourMomentum & momentum ) [inline]

Set the momentum of this Particle.

Definition at line 62 of file Particle.hh.

References Particle::_momentum, and Particle::momentum().

Referenced by ClusteredLepton::addPhoton(), and DISFinalState::project().

                                                        {
      _momentum = momentum;
      return *this;
    }

Member Data Documentation

PdgId _id [private]

The PDG ID code for this Particle.

Definition at line 103 of file Particle.hh.

Referenced by Particle::pdgId().

FourMomentum _momentum [private]

The momentum of this projection of the Particle.

Definition at line 106 of file Particle.hh.

Referenced by Particle::momentum(), and Particle::setMomentum().

const GenParticle* _original [private]

A pointer to the original GenParticle from which this Particle is projected.

Definition at line 100 of file Particle.hh.

Referenced by Particle::genParticle(), and Particle::hasGenParticle().

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

Public Member Functions

Private Attributes

Detailed Description

Constructor & Destructor Documentation

Member Function Documentation

Member Data Documentation