P4PxPyPzEBase Class Reference

P4PxPyPzEBase is a base class for classes with 4-momentum behavior, for which Px, Py, Pz and M are natural parameters. More...

#include <P4PxPyPzEBase.h>

Inheritance diagram for P4PxPyPzEBase:

Collaboration diagram for P4PxPyPzEBase:

Public Types
enum	Kind {   P4EETAPHIM , P4IPTCOTTHPHIM , P4PTETAPHIM , P4PXPYPZE ,   UNKNOWN }

Public Member Functions
virtual	~P4PxPyPzEBase ()
	virtual destructor needed by pool
virtual double	m () const
	mass
virtual double	m2 () const
	mass squared
virtual double	eta () const
	pseudo rapidity
virtual double	phi () const
	phi in [-pi,pi[
virtual double	p () const
	momentum magnitude
virtual double	p2 () const
	square of momentum magnitude
virtual double	pt () const
	transverse momentum
virtual double	et () const
	transverse energy defined to be e*sin(theta)
virtual double	iPt () const
	inverse of transverse momentum
virtual double	rapidity () const
	rapidity
virtual double	cosPhi () const
	cosinus phi
virtual double	sinPhi () const
	sinus phi
virtual double	tanTh () const
	tan theta
virtual double	cotTh () const
	cottan theta
virtual double	cosTh () const
	cosinus theta
virtual double	sinTh () const
	sinus theta
virtual CLHEP::HepLorentzVector	hlv () const
	CLHEP HepLorentzVector.
virtual const I4MomentumError *	errors () const
	Access to errors, if available; returns 0 if no errors.
virtual void	set4Mom (const I4Momentum &theI4Mom)
	set all 4-mom from another I4Momentum reference DUMMY IMPLEMENTATION
virtual void	set4Mom (const I4Momentum *const theI4Mom)
	set all 4-mom from another I4Momentum pointer DUMMY IMPLEMENTATION
virtual void	set4Mom (const CLHEP::HepLorentzVector &theHlv)
	set all 4-mom from a CLHEP HepLorentzVector DUMMY IMPLEMENTATION
virtual I4Momentum::Kind	kind () const
	tells what kind of P4XYZT this is
virtual std::ostream &	dump (std::ostream &out) const
	Print I4Momentum content.
virtual double	px () const =0
	x component of momentum
virtual double	py () const =0
	y component of momentum
virtual double	pz () const =0
	z component of momentum
virtual double	e () const =0
	energy

Detailed Description

P4PxPyPzEBase is a base class for classes with 4-momentum behavior, for which Px, Py, Pz and M are natural parameters.

Any class deriving from it should implement px(), py(), pz(), e().

Author

David Rousseau rouss.nosp@m.eau@.nosp@m.lal.i.nosp@m.n2p3.nosp@m..fr

Definition at line 24 of file P4PxPyPzEBase.h.

Member Enumeration Documentation

Kind

enum I4Momentum::Kind

inherited

Enumerator
P4EETAPHIM
P4IPTCOTTHPHIM
P4PTETAPHIM
P4PXPYPZE
UNKNOWN

Definition at line 33 of file I4Momentum.h.

{ P4EETAPHIM, P4IPTCOTTHPHIM, P4PTETAPHIM, P4PXPYPZE, UNKNOWN };

Constructor & Destructor Documentation

~P4PxPyPzEBase()

P4PxPyPzEBase::~P4PxPyPzEBase ( )

virtual

virtual destructor needed by pool

Definition at line 11 of file P4PxPyPzEBase.cxx.

{}

Member Function Documentation

cosPhi()

double P4PxPyPzEBase::cosPhi ( ) const

virtual

cosinus phi

Implements I4Momentum.

Reimplemented in Nav4MomWrapper< Navigable_t, P4Momentum_t >.

Definition at line 77 of file P4PxPyPzEBase.cxx.

{
 return this->px()/this->pt();
}

cosTh()

double P4PxPyPzEBase::cosTh ( ) const

virtual

cosinus theta

Implements I4Momentum.

Reimplemented in Nav4MomWrapper< Navigable_t, P4Momentum_t >.

Definition at line 98 of file P4PxPyPzEBase.cxx.

{ 
  
  return this->pz()/this->p();
  
}

cotTh()

double P4PxPyPzEBase::cotTh ( ) const

virtual

cottan theta

Implements I4Momentum.

Reimplemented in Nav4MomWrapper< Navigable_t, P4Momentum_t >.

Definition at line 92 of file P4PxPyPzEBase.cxx.

{ 
 return this->pz()/this->pt();
}

dump()

std::ostream & P4PxPyPzEBase::dump ( std::ostream & out ) const

virtual

Print I4Momentum content.

Implements I4Momentum.

Reimplemented in Nav4MomWrapper< Navigable_t, P4Momentum_t >, and Rec::TrackParticle.

Definition at line 152 of file P4PxPyPzEBase.cxx.

{
 
  std::stringstream outx;
  outx << "[px,py,pz,e] ="
         << std::right << std::scientific << std::setprecision(8) 
         << std::setw(16) << this->px()
         << std::setw(16) << this->py()
         << std::setw(16) << this->pz()
         << std::setw(16) << this->e();
 
   out<<outx.str();
  
  return out;
 
}

e()

virtual double I4Momentum::e ( ) const

pure virtualinherited

energy

Implemented in CaloCell, CaloCluster, CaloTower, CaloVertexedCell, Nav4MomWrapper< Navigable_t, P4Momentum_t >, Nav4MomWrapper< Navigable< DataVector< INavigable4Momentum >, double, std::vector< std::pair< ElementLink< DataVector< INavigable4Momentum > >, double > > >, P4ImplPxPyPzE >, P4EEtaPhiM, P4Impl< P4Mom_t >, P4Impl< P4ImplEEtaPhiM >, P4Impl< P4ImplIPtCotThPhiM >, P4Impl< P4ImplPtEtaPhiM >, P4Impl< P4ImplPxPyPzE >, P4IPtCotThPhiMBase, P4PtEtaPhiMBase, P4PxPyPzE, ParticleImpl< INavigable_t, I4Momentum_t, IParticle_t >, ParticleImpl< ::Analysis::MuonNavigation, ::P4ImplIPtCotThPhiM >, ParticleImpl< ::Analysis::TauJetNavigation, ::P4ImplEEtaPhiM >, ParticleImpl< CompositeParticleNavigation, P4ImplPxPyPzE, ParticleEvent::Base >, ParticleImpl< egammaNavigation, P4ImplEEtaPhiM >, ParticleImpl< INavigable_t, I4Momentum_t, IParticle_t >, ParticleImpl< Navigable< DataVector< INavigable4Momentum >, double, std::vector< std::pair< ElementLink< DataVector< INavigable4Momentum > >, double > > >, P4ImplPxPyPzE, ParticleEvent::Base >, ParticleImpl< NavigableTerminalNode, P4ImplEEtaPhiM, ParticleEvent::Base >, ParticleImpl< NavigableTerminalNode, P4ImplIPtCotThPhiM, ParticleEvent::Base >, ParticleImpl< NavigableTerminalNode, P4ImplPxPyPzE, ParticleEvent::Base >, ParticleImpl< NavigableTerminalNode, P4PtEtaPhiM >, ParticleImpl< NeutrinoNavigation, P4ImplPxPyPzE >, ParticleImpl< TruthParticleNavigation, TruthParticleMomentum, TruthParticleBase >, ParticleSigStateImpl< INavigable_t, I4Momentum_t, IParticle_t >, ParticleSigStateImpl< INavigable_t, I4Momentum_t, IParticle_t >, ParticleSigStateImpl< Navigable< DataVector< INavigable4Momentum >, double, std::vector< std::pair< ElementLink< DataVector< INavigable4Momentum > >, double > > >, P4ImplPxPyPzE, ParticleEvent::Base >, ParticleSigStateImpl< Navigable< INavigable4MomentumCollection, double >, P4ImplPxPyPzE >, ParticleSigStateImpl< Navigable< INavigable4MomentumCollection, double >, P4ImplPxPyPzE, ParticleEvent::Base >, and TrigT2Jet.

errors()

const I4MomentumError * P4PxPyPzEBase::errors ( ) const

virtual

Access to errors, if available; returns 0 if no errors.

Implements I4Momentum.

Reimplemented in Nav4MomWrapper< Navigable_t, P4Momentum_t >, and P4PxPyPzE.

Definition at line 169 of file P4PxPyPzEBase.cxx.

{
  return 0;
}

et()

double P4PxPyPzEBase::et ( ) const

virtual

transverse energy defined to be e*sin(theta)

Implements I4Momentum.

Reimplemented in Nav4MomWrapper< Navigable_t, P4Momentum_t >.

Definition at line 125 of file P4PxPyPzEBase.cxx.

   {
     //to be improved
  return this->e()*this->sinTh();
   }

eta()

double P4PxPyPzEBase::eta ( ) const

virtual

pseudo rapidity

Implements I4Momentum.

Reimplemented in Nav4MomWrapper< Navigable_t, P4Momentum_t >.

Definition at line 32 of file P4PxPyPzEBase.cxx.

{ 
  const double e=this->e();
  
  const double px=this->px();
  const double py=this->py();
  const double pz=this->pz();
  // FIXME: should we use a more underflow-friendly formula:
  //  sqrt(a**2 + b**2) 
  //   => y.sqrt(1+(x/y)**2) where y=max(|a|,|b|) and x=min(|a|,|b|)
  const double p =std::sqrt (px*px + py*py + pz*pz);
  if (p==0.0) return 0.0;
  if (p==+pz) return +std::numeric_limits<double>::infinity();
  if (p==-pz) return -std::numeric_limits<double>::infinity();
  //PO flip if negative e
  return (e>0 ? 1. : -1.)* 0.5*log((p+pz)/(p-pz));
}

hlv()

CLHEP::HepLorentzVector P4PxPyPzEBase::hlv ( ) const

virtual

CLHEP HepLorentzVector.

Implements I4Momentum.

Reimplemented in Nav4MomWrapper< Navigable_t, P4Momentum_t >.

Definition at line 147 of file P4PxPyPzEBase.cxx.

{ return CLHEP::HepLorentzVector(this->px(),this->py(),this->pz(),this->e());
 
}

iPt()

double P4PxPyPzEBase::iPt ( ) const

virtual

inverse of transverse momentum

Implements I4Momentum.

Reimplemented in Nav4MomWrapper< Navigable_t, P4Momentum_t >.

Definition at line 131 of file P4PxPyPzEBase.cxx.

  { return 1./this->pt();
   }

kind()

virtual I4Momentum::Kind P4PxPyPzEBase::kind ( ) const

inlinevirtual

tells what kind of P4XYZT this is

Implements I4Momentum.

Reimplemented in Nav4MomWrapper< Navigable_t, P4Momentum_t >.

Definition at line 59 of file P4PxPyPzEBase.h.

{ return I4Momentum::P4PXPYPZE; };

m()

double P4PxPyPzEBase::m ( ) const

virtual

mass

Implements I4Momentum.

Reimplemented in Nav4MomWrapper< Navigable_t, P4Momentum_t >.

Definition at line 25 of file P4PxPyPzEBase.cxx.

{
  const double m2 = this->m2();  
 
  return m2 < 0.0 ? -std::sqrt(-m2) : std::sqrt (m2);
}

m2()

double P4PxPyPzEBase::m2 ( ) const

virtual

mass squared

Implements I4Momentum.

Reimplemented in Nav4MomWrapper< Navigable_t, P4Momentum_t >.

Definition at line 14 of file P4PxPyPzEBase.cxx.

{
  const double px=this->px();
  const double py=this->py();
  const double pz=this->pz();
  const double e =this->e();
  
  const double m2 = e*e - (px*px + py*py + pz*pz);
  return m2;
}

p()

double P4PxPyPzEBase::p ( ) const

virtual

momentum magnitude

Implements I4Momentum.

Reimplemented in Nav4MomWrapper< Navigable_t, P4Momentum_t >.

Definition at line 68 of file P4PxPyPzEBase.cxx.

{ 
  //PO return the correc 
  const double e=this->e();
  
  return  (e>0 ? 1. : -1.)*std::sqrt(this->p2());
}

p2()

double P4PxPyPzEBase::p2 ( ) const

virtual

square of momentum magnitude

Implements I4Momentum.

Reimplemented in Nav4MomWrapper< Navigable_t, P4Momentum_t >.

Definition at line 59 of file P4PxPyPzEBase.cxx.

{ 
  const double px=this->px();
  const double py=this->py();
  const double pz=this->pz();
 
  return px*px+py*py+pz*pz;
}

phi()

double P4PxPyPzEBase::phi ( ) const

virtual

phi in [-pi,pi[

Implements I4Momentum.

Reimplemented in Nav4MomWrapper< Navigable_t, P4Momentum_t >.

Definition at line 50 of file P4PxPyPzEBase.cxx.

{ 
  const double e=this->e();
  const double px= (e>0 ? 1. : -1.)*this->px();
  const double py= (e>0 ? 1. : -1.)*this->py();
  return px == 0.0 && py == 0.0 ? 0.0 : atan2(py,px);
}

pt()

double P4PxPyPzEBase::pt ( ) const

virtual

transverse momentum

Implements I4Momentum.

Reimplemented in Nav4MomWrapper< Navigable_t, P4Momentum_t >.

Definition at line 114 of file P4PxPyPzEBase.cxx.

{
  const double e=this->e();
  const double px=this->px();
  const double py=this->py();
  //PO flip sign if negative energy
  return  (e>0 ? 1. : -1.)*std::sqrt(px*px+py*py);
 
   }

px()

virtual double I4Momentum::px ( ) const

pure virtualinherited

x component of momentum

Implemented in Nav4MomWrapper< Navigable_t, P4Momentum_t >, Nav4MomWrapper< Navigable< DataVector< INavigable4Momentum >, double, std::vector< std::pair< ElementLink< DataVector< INavigable4Momentum > >, double > > >, P4ImplPxPyPzE >, P4EEtaPhiMBase, P4Impl< P4Mom_t >, P4Impl< P4ImplEEtaPhiM >, P4Impl< P4ImplIPtCotThPhiM >, P4Impl< P4ImplPtEtaPhiM >, P4Impl< P4ImplPxPyPzE >, P4IPtCotThPhiMBase, P4PtEtaPhiMBase, P4PxPyPzE, ParticleImpl< INavigable_t, I4Momentum_t, IParticle_t >, ParticleImpl< ::Analysis::MuonNavigation, ::P4ImplIPtCotThPhiM >, ParticleImpl< ::Analysis::TauJetNavigation, ::P4ImplEEtaPhiM >, ParticleImpl< CompositeParticleNavigation, P4ImplPxPyPzE, ParticleEvent::Base >, ParticleImpl< egammaNavigation, P4ImplEEtaPhiM >, ParticleImpl< INavigable_t, I4Momentum_t, IParticle_t >, ParticleImpl< Navigable< DataVector< INavigable4Momentum >, double, std::vector< std::pair< ElementLink< DataVector< INavigable4Momentum > >, double > > >, P4ImplPxPyPzE, ParticleEvent::Base >, ParticleImpl< NavigableTerminalNode, P4ImplEEtaPhiM, ParticleEvent::Base >, ParticleImpl< NavigableTerminalNode, P4ImplIPtCotThPhiM, ParticleEvent::Base >, ParticleImpl< NavigableTerminalNode, P4ImplPxPyPzE, ParticleEvent::Base >, ParticleImpl< NavigableTerminalNode, P4PtEtaPhiM >, ParticleImpl< NeutrinoNavigation, P4ImplPxPyPzE >, ParticleImpl< TruthParticleNavigation, TruthParticleMomentum, TruthParticleBase >, ParticleSigStateImpl< INavigable_t, I4Momentum_t, IParticle_t >, ParticleSigStateImpl< INavigable_t, I4Momentum_t, IParticle_t >, ParticleSigStateImpl< Navigable< DataVector< INavigable4Momentum >, double, std::vector< std::pair< ElementLink< DataVector< INavigable4Momentum > >, double > > >, P4ImplPxPyPzE, ParticleEvent::Base >, ParticleSigStateImpl< Navigable< INavigable4MomentumCollection, double >, P4ImplPxPyPzE >, and ParticleSigStateImpl< Navigable< INavigable4MomentumCollection, double >, P4ImplPxPyPzE, ParticleEvent::Base >.

py()

virtual double I4Momentum::py ( ) const

pure virtualinherited

y component of momentum

Implemented in Nav4MomWrapper< Navigable_t, P4Momentum_t >, Nav4MomWrapper< Navigable< DataVector< INavigable4Momentum >, double, std::vector< std::pair< ElementLink< DataVector< INavigable4Momentum > >, double > > >, P4ImplPxPyPzE >, P4EEtaPhiMBase, P4Impl< P4Mom_t >, P4Impl< P4ImplEEtaPhiM >, P4Impl< P4ImplIPtCotThPhiM >, P4Impl< P4ImplPtEtaPhiM >, P4Impl< P4ImplPxPyPzE >, P4IPtCotThPhiMBase, P4PtEtaPhiMBase, P4PxPyPzE, ParticleImpl< INavigable_t, I4Momentum_t, IParticle_t >, ParticleImpl< ::Analysis::MuonNavigation, ::P4ImplIPtCotThPhiM >, ParticleImpl< ::Analysis::TauJetNavigation, ::P4ImplEEtaPhiM >, ParticleImpl< CompositeParticleNavigation, P4ImplPxPyPzE, ParticleEvent::Base >, ParticleImpl< egammaNavigation, P4ImplEEtaPhiM >, ParticleImpl< INavigable_t, I4Momentum_t, IParticle_t >, ParticleImpl< Navigable< DataVector< INavigable4Momentum >, double, std::vector< std::pair< ElementLink< DataVector< INavigable4Momentum > >, double > > >, P4ImplPxPyPzE, ParticleEvent::Base >, ParticleImpl< NavigableTerminalNode, P4ImplEEtaPhiM, ParticleEvent::Base >, ParticleImpl< NavigableTerminalNode, P4ImplIPtCotThPhiM, ParticleEvent::Base >, ParticleImpl< NavigableTerminalNode, P4ImplPxPyPzE, ParticleEvent::Base >, ParticleImpl< NavigableTerminalNode, P4PtEtaPhiM >, ParticleImpl< NeutrinoNavigation, P4ImplPxPyPzE >, ParticleImpl< TruthParticleNavigation, TruthParticleMomentum, TruthParticleBase >, ParticleSigStateImpl< INavigable_t, I4Momentum_t, IParticle_t >, ParticleSigStateImpl< INavigable_t, I4Momentum_t, IParticle_t >, ParticleSigStateImpl< Navigable< DataVector< INavigable4Momentum >, double, std::vector< std::pair< ElementLink< DataVector< INavigable4Momentum > >, double > > >, P4ImplPxPyPzE, ParticleEvent::Base >, ParticleSigStateImpl< Navigable< INavigable4MomentumCollection, double >, P4ImplPxPyPzE >, and ParticleSigStateImpl< Navigable< INavigable4MomentumCollection, double >, P4ImplPxPyPzE, ParticleEvent::Base >.

pz()

virtual double I4Momentum::pz ( ) const

pure virtualinherited

z component of momentum

Implemented in Nav4MomWrapper< Navigable_t, P4Momentum_t >, Nav4MomWrapper< Navigable< DataVector< INavigable4Momentum >, double, std::vector< std::pair< ElementLink< DataVector< INavigable4Momentum > >, double > > >, P4ImplPxPyPzE >, P4EEtaPhiMBase, P4Impl< P4Mom_t >, P4Impl< P4ImplEEtaPhiM >, P4Impl< P4ImplIPtCotThPhiM >, P4Impl< P4ImplPtEtaPhiM >, P4Impl< P4ImplPxPyPzE >, P4IPtCotThPhiMBase, P4PtEtaPhiMBase, P4PxPyPzE, ParticleImpl< INavigable_t, I4Momentum_t, IParticle_t >, ParticleImpl< ::Analysis::MuonNavigation, ::P4ImplIPtCotThPhiM >, ParticleImpl< ::Analysis::TauJetNavigation, ::P4ImplEEtaPhiM >, ParticleImpl< CompositeParticleNavigation, P4ImplPxPyPzE, ParticleEvent::Base >, ParticleImpl< egammaNavigation, P4ImplEEtaPhiM >, ParticleImpl< INavigable_t, I4Momentum_t, IParticle_t >, ParticleImpl< Navigable< DataVector< INavigable4Momentum >, double, std::vector< std::pair< ElementLink< DataVector< INavigable4Momentum > >, double > > >, P4ImplPxPyPzE, ParticleEvent::Base >, ParticleImpl< NavigableTerminalNode, P4ImplEEtaPhiM, ParticleEvent::Base >, ParticleImpl< NavigableTerminalNode, P4ImplIPtCotThPhiM, ParticleEvent::Base >, ParticleImpl< NavigableTerminalNode, P4ImplPxPyPzE, ParticleEvent::Base >, ParticleImpl< NavigableTerminalNode, P4PtEtaPhiM >, ParticleImpl< NeutrinoNavigation, P4ImplPxPyPzE >, ParticleImpl< TruthParticleNavigation, TruthParticleMomentum, TruthParticleBase >, ParticleSigStateImpl< INavigable_t, I4Momentum_t, IParticle_t >, ParticleSigStateImpl< INavigable_t, I4Momentum_t, IParticle_t >, ParticleSigStateImpl< Navigable< DataVector< INavigable4Momentum >, double, std::vector< std::pair< ElementLink< DataVector< INavigable4Momentum > >, double > > >, P4ImplPxPyPzE, ParticleEvent::Base >, ParticleSigStateImpl< Navigable< INavigable4MomentumCollection, double >, P4ImplPxPyPzE >, and ParticleSigStateImpl< Navigable< INavigable4MomentumCollection, double >, P4ImplPxPyPzE, ParticleEvent::Base >.

rapidity()

double P4PxPyPzEBase::rapidity ( ) const

virtual

rapidity

Implements I4Momentum.

Reimplemented in Nav4MomWrapper< Navigable_t, P4Momentum_t >.

Definition at line 136 of file P4PxPyPzEBase.cxx.

{
  const double e =this->e();
  const double pz=this->pz();
  if (e==0.0) return 0.0;
  if (e==+pz) return +std::numeric_limits<double>::infinity();
  if (e==-pz) return -std::numeric_limits<double>::infinity();
  //PO invariant under flipping of 4-mom with neg E
  return 0.5*std::log((e+pz)/(e-pz));
}

set4Mom() [1/3]

void P4PxPyPzEBase::set4Mom ( const CLHEP::HepLorentzVector & theHlv )

virtual

set all 4-mom from a CLHEP HepLorentzVector DUMMY IMPLEMENTATION

Implements I4Momentum.

Reimplemented in Nav4MomWrapper< Navigable_t, P4Momentum_t >, P4PxPyPzE, and Rec::TrackParticle.

Definition at line 188 of file P4PxPyPzEBase.cxx.

{
  std::cout << "FATAL ERROR dummy P4PxPyPzEBase::set4Mom called " << std::endl ;
  std::abort();
}

set4Mom() [2/3]

void P4PxPyPzEBase::set4Mom ( const I4Momentum & theI4Mom )

virtual

set all 4-mom from another I4Momentum reference DUMMY IMPLEMENTATION

Implements I4Momentum.

Reimplemented in Nav4MomWrapper< Navigable_t, P4Momentum_t >, P4PxPyPzE, and Rec::TrackParticle.

Definition at line 175 of file P4PxPyPzEBase.cxx.

{ 
  std::cout << "FATAL ERROR dummy P4PxPyPzEBase::set4Mom called " << std::endl ;
  std::abort();
}

set4Mom() [3/3]

void P4PxPyPzEBase::set4Mom ( const I4Momentum *const theI4Mom )

virtual

set all 4-mom from another I4Momentum pointer DUMMY IMPLEMENTATION

Implements I4Momentum.

Reimplemented in Nav4MomWrapper< Navigable_t, P4Momentum_t >, P4PxPyPzE, and Rec::TrackParticle.

Definition at line 181 of file P4PxPyPzEBase.cxx.

{ 
  std::cout << "FATAL ERROR dummy P4PxPyPzEBase::set4Mom called " << std::endl ;
  std::abort();
 
}

sinPhi()

double P4PxPyPzEBase::sinPhi ( ) const

virtual

sinus phi

Implements I4Momentum.

Reimplemented in Nav4MomWrapper< Navigable_t, P4Momentum_t >.

Definition at line 82 of file P4PxPyPzEBase.cxx.

{
 return this->py()/this->pt();
}

sinTh()

double P4PxPyPzEBase::sinTh ( ) const

virtual

sinus theta

Implements I4Momentum.

Reimplemented in Nav4MomWrapper< Navigable_t, P4Momentum_t >.

Definition at line 106 of file P4PxPyPzEBase.cxx.

{ 
  
 return this->pt()/this->p();
 
}

tanTh()

double P4PxPyPzEBase::tanTh ( ) const

virtual

tan theta

Implements I4Momentum.

Reimplemented in Nav4MomWrapper< Navigable_t, P4Momentum_t >.

Definition at line 87 of file P4PxPyPzEBase.cxx.

{ 
 return this->pt()/this->pz();
}

---

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

• P4PxPyPzEBase.h
• P4PxPyPzEBase.cxx