The Units namespace contains the declaration of a number of classes for variables with dimension. More...

Typedefs
typedef QTY< 0, 1, 0 >::Type	Energy
	Energy. More...

typedef Energy	Mass
	Mass has the same unit as Energy <=> c == 1. More...

typedef QTY< 1, 0, 0 >::Type	Length
	Length. More...

typedef Length	Time
	Time has the same unit as Length. More...

typedef QTY<-1, 0, 0 >::Type	InvLength
	Inverse Length. More...

typedef double	Velocity
	Velocities are dimensionless fractions of c. More...

typedef QTY< 0, 0, 1 >::Type	Charge
	Charge. More...

typedef QTY< 1, 1, 0 >::Type	AngularMomentum
	Angular momentum. More...

typedef QTY<-1, 1, 0 >::Type	Tension
	Tension. More...

typedef QTY< 2, 0, 0 >::Type	Area
	Area will be assumed to be Length . More...

typedef QTY<-2, 0, 0 >::Type	InvArea
	Inverse Area. More...

typedef Area	CrossSection
	Cross section is an area. More...

typedef QTY< 2, 2, 0 >::Type	Energy2XSec
	CrossSection*Energy2. More...

typedef QTY< 2,-2, 0 >::Type	DiffXSec
	CrossSection/Energy2. More...

typedef QTY< 2,-4, 0 >::Type	Diff2XSec
	CrossSection/Energy4. More...

typedef QTY< 2,-6, 0 >::Type	Diff3XSec
	CrossSection/Energy6.

typedef Energy2	Scale
	Scale is the same as a squared energy. More...

typedef ThreeVector< Length >	Point
	A point in three-dimensional euclidean space. More...

typedef ThreeVector< Length >	Distance
	A distance in three-dimensional euclidean space. More...

typedef ThreeVector< double >	Axis
	A direction in three-dimensional euclidean space. More...

typedef ThreeVector< Energy >	Momentum3
	A momentum in three-dimensional euclidean space. More...

typedef ThreeVector< double >	Boost
	A three-dimensional boost vector. More...

typedef LorentzVector< Length >	LorentzDistance
	A distance in four-dimensional space-time. More...

typedef Lorentz5Vector< Length >	Lorentz5Distance
	A distance in four-dimensional space-time with an explicit invariant time component. More...

typedef LorentzVector< Length >	LorentzPoint
	A point in four-dimensional space-time. More...

typedef LorentzVector< Energy >	LorentzMomentum
	A momentum in four-dimensional space-time. More...

typedef Lorentz5Vector< Energy >	Lorentz5Momentum
	A momentum in four-dimensional space-time with an explicit invariant mass component. More...

typedef Transverse< Energy >	TransverseMomentum
	Transverse components of a momentum. More...

Higher powers of energy.
Even higher powers can be created with similar typedefs.
typedef QTY< 0, 2, 0 >::Type	Energy2

typedef QTY< 0, 3, 0 >::Type	Energy3

typedef QTY< 0, 4, 0 >::Type	Energy4

typedef QTY< 0, 5, 0 >::Type	Energy5

typedef QTY< 0, 6, 0 >::Type	Energy6

typedef QTY< 0, 7, 0 >::Type	Energy7

typedef QTY< 0, 8, 0 >::Type	Energy8

typedef QTY< 0, 9, 0 >::Type	Energy9

typedef QTY< 0, 10, 0 >::Type	Energy10

typedef QTY< 0, 11, 0 >::Type	Energy11

typedef QTY< 0, 12, 0 >::Type	Energy12

typedef QTY< 0, 1, 0, 1, 2, 1 >::Type	SqrtEnergy

typedef QTY< 0,-1, 0, 1, 2, 1 >::Type	InvSqrtEnergy

typedef QTY< 0,-1, 0 >::Type	InvEnergy

typedef QTY< 0,-2, 0 >::Type	InvEnergy2

typedef QTY< 0,-3, 0 >::Type	InvEnergy3

typedef QTY< 0,-4, 0 >::Type	InvEnergy4

typedef QTY< 0,-5, 0 >::Type	InvEnergy5

typedef QTY< 0,-6, 0 >::Type	InvEnergy6

typedef QTY< 0,-7, 0 >::Type	InvEnergy7

typedef QTY< 0,-8, 0 >::Type	InvEnergy8

typedef QTY< 0,-9, 0 >::Type	InvEnergy9

typedef QTY< 0,-10, 0 >::Type	InvEnergy10

typedef QTY< 0,-11, 0 >::Type	InvEnergy11

typedef QTY< 0,-12, 0 >::Type	InvEnergy12

Variables
const QTY< 1, 1, 0 >::Type	hbarc = 197.326968e-15 * MeV * meter
	Planck's constant times c (PDG 2006 value 197.326968(17) MeV fm)

const QTY< 1, 1, 0 >::Type	hbar_Planck = hbarc / 1.0
	Planck's constant (PDG 2006 value 197.326968(17) MeV fm)

Pre-defined basic units.
const Length	millimeter = TypeTraits<Length>::baseunit

const Energy	MeV = TypeTraits<Energy>::baseunit

const Charge	eplus = TypeTraits<Charge>::baseunit

const Energy	keV = 1.0e-3 * MeV

const Energy	GeV = 1.0e3 * MeV

const Energy	TeV = 1.0e6 * MeV

const Energy2	MeV2 = MeV * MeV

const Energy2	GeV2 = GeV * GeV

const InvEnergy	InvGeV = 1/GeV

const Length	meter = 1.0e3 * millimeter

const Length	mm = millimeter

const Length	centimeter = 10.0*millimeter

const Length	micrometer = 1.0e-3 * millimeter

const Length	nanometer = 1.0e-6 * millimeter

const Length	picometer = 1.0e-9 * millimeter

const Length	femtometer = 1.0e-12 * millimeter

const Area	picobarn = 1.0e-40 * meter * meter

const Area	nanobarn = 1.0e3 * picobarn

const Area	microbarn = 1.0e6 * picobarn

const Area	millibarn = 1.0e9 * picobarn

const Area	barn = 1.0e12 * picobarn

const Area	femtobarn = 1.0e-3 * picobarn

Detailed Description

The Units namespace contains the declaration of a number of classes for variables with dimension.

Currently they are all typedefs of double, but in the future the SIUnits package will be used.

The file Utilities/UnitIO.h defines helper-classes and helper functions to read and write variables with dimensions. As an example, to read and write an energy variable e in units of GeV, use: os << ounit(e, GeV) and is >> iunit(e, GeV)