Yet another four vector class, with metric +—. More...

#include <FourVector.h>

Collaboration diagram for FourVector:

Public Member Functions
	FourVector ()
	Default constructor.

	FourVector (double E_, double px_, double py_, double pz_)
	Constructor from the components.

	FourVector (double E_, const ThreeVector &p_)
	Constructor from energy and three momentum.

	FourVector (const ThreeVector &p_, double m_)
	Constructor from three momentum and mass.

double	getE () const
	Returns the energy / 0 component.

double	getPx () const
	Returns the x momentum / 1 component.

double	getPy () const
	Returns the y momentum / 2 component.

double	getPz () const
	Returns the z momentum / 3 component.

double	getM2 () const
	Returns the mass squared / magnitude squared.

double	getM () const
	Returns the mass / magnitude.

double	getMass () const
	Returns the mass / magnitude.

double	getP2 () const
	Returns the momentum squared / magnitude of the three vector squared.

double	getP () const
	Returns the momentum / magnitude of the three vector.

double	getPt2 () const
	Returns the transverse momentum squared / magnitude of the 1 and 2 component vector squared.

double	getPt () const
	Returns the transverse momentum / magnitude of the 1 and 2 component vector.

double	getPhi () const
	Returns the azimuthal angle of the momentum / three vector squared.

double	getTheta () const
	Returns the polar angle of the momentum / three vector squared.

double	getEta () const
	Returns the pseudo rapidity of the momentum / three vector squared.

double	getComponent (int i) const
	Returns the i'th component (starting from 0=energy)

ThreeVector	getBeta () const

double	getGamma () const

ThreeVector	getBetaGamma () const

const ThreeVector &	getThreeVector () const
	Returns the momentum three vector.

FourVector &	boost (const FourVector &P)

void	decayto (FourVector &d1, FourVector &d2) const

void	setValues (double E_, double px_, double py_, double pz_)

FourVector &	operator+= (const FourVector &rhs)

FourVector &	operator-= (const FourVector &rhs)

FourVector &	operator*= (double rhs)

Private Attributes
double	E
	The energy / 0 component.

ThreeVector	p
	The momentum three vector.

Related Functions
(Note that these are not member functions.)
FourVector	operator+ (const FourVector &lhs, const FourVector &rhs)
	Sum of two four vectors.

FourVector	operator- (const FourVector &lhs, const FourVector &rhs)
	Difference of two four vectors.

FourVector	operator- (const FourVector &rhs)
	Negative of a four vector.

FourVector	operator* (double lhs, const FourVector &rhs)
	Scalar product of a four vector.

double	operator* (const FourVector &lhs, const FourVector &rhs)
	Scalar product of a four vector.

std::ostream &	operator<< (std::ostream &os, const FourVector &rhs)
	Prints a four vector.

Detailed Description

Yet another four vector class, with metric +—.

Author: Benno List Last update:

Date: 2008/02/12 10:19:05

by:

Author: blist

Definition at line 43 of file FourVector.h.

Constructor & Destructor Documentation

◆ FourVector() [1/4]

FourVector ( )

inline

Default constructor.

Definition at line 111 of file FourVector.h.

112 : E(0), p()

113 {}

Belle2::OrcaKinFit::FourVector::E

double E

The energy / 0 component.

Definition: FourVector.h:107

Belle2::OrcaKinFit::FourVector::p

ThreeVector p

The momentum three vector.

Definition: FourVector.h:108

◆ FourVector() [2/4]

FourVector	(	double	E_,
		double	px_,
		double	py_,
		double	pz_
	)

inline

Constructor from the components.

Definition at line 115 of file FourVector.h.

116 : E(E_), p(px_, py_, pz_)

117 {}

◆ FourVector() [3/4]

FourVector	(	double	E_,
		const ThreeVector &	p_
	)

inline

Constructor from energy and three momentum.

Definition at line 119 of file FourVector.h.

120 : E(E_), p(p_)

121 {}

◆ FourVector() [4/4]

FourVector	(	const ThreeVector &	p_,
		double	m_
	)

inline

Constructor from three momentum and mass.

Definition at line 123 of file FourVector.h.

124 : E(std::sqrt(p_.getP2() + m * m)), p(p_)

125 {}

Member Function Documentation

◆ getBeta()

ThreeVector getBeta ( ) const

inline

Definition at line 89 of file FourVector.h.

89{ assert(E > 0); return (1. / E) * p;};

◆ getBetaGamma()

ThreeVector getBetaGamma ( ) const

inline

Definition at line 91 of file FourVector.h.

91{ assert(getM() > 0); return (1. / getM() > 0) * p;};

Belle2::OrcaKinFit::FourVector::getM

double getM() const

Returns the mass / magnitude.

Definition: FourVector.h:139

◆ getComponent()

double getComponent ( int i ) const

inline

Returns the i'th component (starting from 0=energy)

Definition at line 147 of file FourVector.h.

    {
      switch (i) {
        case 1: return getPx();
        case 2: return getPy();
        case 3: return getPz();
      }
      return getE();
    }

◆ getE()

double getE ( ) const

inline

Returns the energy / 0 component.

Definition at line 127 of file FourVector.h.

127{ return E; }

◆ getEta()

double getEta ( ) const

inline

Returns the pseudo rapidity of the momentum / three vector squared.

Definition at line 145 of file FourVector.h.

145{ return p.getEta(); }

◆ getGamma()

double getGamma ( ) const

inline

Definition at line 90 of file FourVector.h.

90{ assert(getM() > 0); return getE() / getM();};

◆ getM()

double getM ( ) const

inline

Returns the mass / magnitude.

Definition at line 139 of file FourVector.h.

139{ return std::sqrt(getM2()); }

Belle2::OrcaKinFit::FourVector::getM2

double getM2() const

Returns the mass squared / magnitude squared.

Definition: FourVector.h:138

◆ getM2()

double getM2 ( ) const

inline

Returns the mass squared / magnitude squared.

Definition at line 138 of file FourVector.h.

138{ return std::abs(getE() * getE() - getP2()); }

Belle2::OrcaKinFit::FourVector::getP2

double getP2() const

Returns the momentum squared / magnitude of the three vector squared.

Definition: FourVector.h:135

◆ getMass()

double getMass ( ) const

inline

Returns the mass / magnitude.

Definition at line 140 of file FourVector.h.

140{ return std::sqrt(getM2()); }

◆ getP()

double getP ( ) const

inline

Returns the momentum / magnitude of the three vector.

Definition at line 136 of file FourVector.h.

136{ return p.getP(); }

◆ getP2()

double getP2 ( ) const

inline

Returns the momentum squared / magnitude of the three vector squared.

Definition at line 135 of file FourVector.h.

135{ return p.getP2(); }

◆ getPhi()

double getPhi ( ) const

inline

Returns the azimuthal angle of the momentum / three vector squared.

Definition at line 142 of file FourVector.h.

142{ return p.getPhi(); }

◆ getPt()

double getPt ( ) const

inline

Returns the transverse momentum / magnitude of the 1 and 2 component vector.

Definition at line 133 of file FourVector.h.

133{ return p.getPt(); }

◆ getPt2()

double getPt2 ( ) const

inline

Returns the transverse momentum squared / magnitude of the 1 and 2 component vector squared.

Definition at line 132 of file FourVector.h.

132{ return p.getPt2(); }

◆ getPx()

double getPx ( ) const

inline

Returns the x momentum / 1 component.

Definition at line 128 of file FourVector.h.

128{ return p.getPx(); }

◆ getPy()

double getPy ( ) const

inline

Returns the y momentum / 2 component.

Definition at line 129 of file FourVector.h.

129{ return p.getPy(); }

◆ getPz()

double getPz ( ) const

inline

Returns the z momentum / 3 component.

Definition at line 130 of file FourVector.h.

130{ return p.getPz(); }

◆ getTheta()

double getTheta ( ) const

inline

Returns the polar angle of the momentum / three vector squared.

Definition at line 143 of file FourVector.h.

143{ return p.getTheta(); }

◆ getThreeVector()

const ThreeVector & getThreeVector ( ) const

inline

Returns the momentum three vector.

Definition at line 94 of file FourVector.h.

94{ return p;}

◆ operator*=()

FourVector & operator*= ( double rhs )

inline

Definition at line 177 of file FourVector.h.

    {
      p *= rhs;
      E *= rhs;
      return *this;
    }

◆ operator+=()

FourVector & operator+= ( const FourVector & rhs )

inline

Definition at line 163 of file FourVector.h.

    {
      p += rhs.p;
      E += rhs.E;
      return *this;
    }

◆ operator-=()

FourVector & operator-= ( const FourVector & rhs )

inline

Definition at line 170 of file FourVector.h.

    {
      p -= rhs.p;
      E -= rhs.E;
      return *this;
    }

◆ setValues()

void setValues	(	double	E_,
		double	px_,
		double	py_,
		double	pz_
	)

inline

Definition at line 157 of file FourVector.h.

    {
      E = E_;
      p.setValues(px_, py_, pz_);
    }

Friends And Related Function Documentation

◆ operator*() [1/2]

double operator*	(	const FourVector &	lhs,
		const FourVector &	rhs
	)

Definition at line 224 of file FourVector.h.

    {
      return lhs.getE() * rhs.getE() - lhs.getPx() * rhs.getPx() - lhs.getPy() * rhs.getPy() - lhs.getPz() * rhs.getPz();
    }

◆ operator*() [2/2]

FourVector operator*	(	double	lhs,
		const FourVector &	rhs
	)

Definition at line 215 of file FourVector.h.

    {
      return FourVector(lhs * rhs.getE(), lhs * rhs.getPx(), lhs * rhs.getPy(), lhs * rhs.getPz());
    }

◆ operator+()

FourVector operator+	(	const FourVector &	lhs,
		const FourVector &	rhs
	)

Definition at line 188 of file FourVector.h.

    {
      return FourVector(lhs.getE() + rhs.getE(), lhs.getPx() + rhs.getPx(), lhs.getPy() + rhs.getPy(), lhs.getPz() + rhs.getPz());
    }

◆ operator-() [1/2]

FourVector operator-	(	const FourVector &	lhs,
		const FourVector &	rhs
	)

Definition at line 197 of file FourVector.h.

    {
      return FourVector(lhs.getE() - rhs.getE(), lhs.getPx() - rhs.getPx(), lhs.getPy() - rhs.getPy(), lhs.getPz() - rhs.getPz());
    }

◆ operator-() [2/2]

FourVector operator- ( const FourVector & rhs )

Definition at line 206 of file FourVector.h.

    {
      return FourVector(-rhs.getE(), -rhs.getPx(), -rhs.getPy(), -rhs.getPz());
    }

◆ operator<<()

std::ostream & operator<<	(	std::ostream &	os,
		const FourVector &	rhs
	)

Definition at line 234 of file FourVector.h.

    {
      os << "(" << rhs.getE() << ", " << rhs.getPx() << ", " << rhs.getPy() << ", " << rhs.getPz() << ")";
      return os;
    }

Member Data Documentation

◆ E

double E

private

The energy / 0 component.

Definition at line 107 of file FourVector.h.

◆ p

ThreeVector p

private

The momentum three vector.

Definition at line 108 of file FourVector.h.

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

analysis/OrcaKinFit/include/FourVector.h

Public Member Functions

Private Attributes

Related Functions

Detailed Description

Constructor & Destructor Documentation

◆ FourVector() [1/4]

◆ FourVector() [2/4]

◆ FourVector() [3/4]

◆ FourVector() [4/4]

Member Function Documentation

◆ getBeta()

◆ getBetaGamma()

◆ getComponent()

◆ getE()

◆ getEta()

◆ getGamma()

◆ getM()

◆ getM2()

◆ getMass()

◆ getP()

◆ getP2()

◆ getPhi()

◆ getPt()

◆ getPt2()

◆ getPx()

◆ getPy()

◆ getPz()

◆ getTheta()

◆ getThreeVector()

◆ operator*=()

◆ operator+=()

◆ operator-=()

◆ setValues()

Friends And Related Function Documentation

◆ operator*() [1/2]

◆ operator*() [2/2]

◆ operator+()

◆ operator-() [1/2]

◆ operator-() [2/2]

◆ operator<<()

Member Data Documentation

◆ E

◆ p