class Rivet::ThreeMomentum

Rivet::ThreeMomentum #

Specialized version of the ThreeVector with momentum functionality.

#include <Vector3.hh>

Inherits from Rivet::Vector3, Rivet::Vector< 3 >

Public Types ##

Public Functions ##

Additional inherited members ##

Public Functions inherited from Rivet::Vector3

Friends inherited from Rivet::Vector3

Public Functions inherited from Rivet::Vector< 3 >

Friends inherited from Rivet::Vector< 3 >

Public Types Documentation ##

using EVector ##

using Rivet::Vector< N >::EVector =  Eigen::Matrix<double,N,1>;

Vector.

Public Functions Documentation ##

function setPx ##

inline ThreeMomentum & setPx(
    double px
)

Set x-component of momentum ( p_x ).

function setPy ##

inline ThreeMomentum & setPy(
    double py
)

Set y-component of momentum ( p_y ).

function setPz ##

inline ThreeMomentum & setPz(
    double pz
)

Set z-component of momentum ( p_z ).

function px ##

inline double px() const

Get x-component of momentum ( p_x ).

function px2 ##

inline double px2() const

Get x-squared ( p_x^2 ).

function py ##

inline double py() const

Get y-component of momentum ( p_y ).

function py2 ##

inline double py2() const

Get y-squared ( p_y^2 ).

function pz ##

inline double pz() const

Get z-component of momentum ( p_z ).

function pz2 ##

inline double pz2() const

Get z-squared ( p_z^2 ).

function p ##

inline double p() const

Get the modulus of the 3-momentum.

function p2 ##

inline double p2() const

Get the modulus-squared of the 3-momentum.

function pTvec ##

inline ThreeMomentum pTvec() const

Calculate the transverse momentum vector ( \vec{p}_T ).

function ptvec ##

inline ThreeMomentum ptvec() const

Synonym for pTvec.

function pT2 ##

inline double pT2() const

Calculate the squared transverse momentum ( p_T^2 ).

function pt2 ##

inline double pt2() const

Calculate the squared transverse momentum ( p_T^2 ).

function pT ##

inline double pT() const

Calculate the transverse momentum ( p_T ).

function pt ##

inline double pt() const

Calculate the transverse momentum ( p_T ).

function operator*= ##

inline ThreeMomentum & operator*=(
    double a
)

Multiply by a scalar.

function operator/= ##

inline ThreeMomentum & operator/=(
    double a
)

Divide by a scalar.

function operator+= ##

inline ThreeMomentum & operator+=(
    const ThreeMomentum & v
)

Add two 3-momenta.

function operator-= ##

inline ThreeMomentum & operator-=(
    const ThreeMomentum & v
)

Subtract two 3-momenta.

function operator- ##

inline ThreeMomentum operator-() const

Multiply all components by -1.

function ThreeMomentum ##

inline ThreeMomentum()

function ThreeMomentum ##

template <typename V3TYPE ,
typename std::enable_if< HasXYZ< V3TYPE >::value, int >::type DUMMY =0>
inline ThreeMomentum(
    const V3TYPE & other
)

function ThreeMomentum ##

inline ThreeMomentum(
    const Vector< 3 > & other
)

function ThreeMomentum ##

inline ThreeMomentum(
    const double px,
    const double py,
    const double pz
)

function ~ThreeMomentum ##

inline ~ThreeMomentum()

function x ##

inline double x() const

function x2 ##

inline double x2() const

function setX ##

inline Vector3 & setX(
    double x
)

function y ##

inline double y() const

function y2 ##

inline double y2() const

function setY ##

inline Vector3 & setY(
    double y
)

function z ##

inline double z() const

function z2 ##

inline double z2() const

function setZ ##

inline Vector3 & setZ(
    double z
)

function dot ##

inline double dot(
    const Vector3 & v
) const

Dot-product with another vector.

function cross ##

inline Vector3 cross(
    const Vector3 & v
) const

Cross-product with another vector.

function angle ##

inline double angle(
    const Vector3 & v
) const

Angle in radians to another vector.

function unitVec ##

inline Vector3 unitVec() const

Unit-normalized version of this vector.

function unit ##

inline Vector3 unit() const

Synonym for unitVec.

function polarVec ##

inline Vector3 polarVec() const

Polar projection of this vector into the x-y plane.

function perpVec ##

inline Vector3 perpVec() const

Synonym for polarVec.

function rhoVec ##

inline Vector3 rhoVec() const

Synonym for polarVec.

function polarRadius2 ##

inline double polarRadius2() const

Square of the polar radius (.

function perp2 ##

inline double perp2() const

Synonym for polarRadius2.

function rho2 ##

inline double rho2() const

Synonym for polarRadius2.

function polarRadius ##

inline double polarRadius() const

Polar radius.

function perp ##

inline double perp() const

Synonym for polarRadius.

function rho ##

inline double rho() const

Synonym for polarRadius.

function azimuthalAngle ##

inline double azimuthalAngle(
    const PhiMapping mapping =ZERO_2PI
) const

Angle subtended by the vector’s projection in x-y and the x-axis.

Note: Returns zero in the case of a vector with null x and y components.

Todo: Would it be better to return NaN in the null-perp case? Or throw?!

function phi ##

inline double phi(
    const PhiMapping mapping =ZERO_2PI
) const

Synonym for azimuthalAngle.

function tanTheta ##

inline double tanTheta() const

Tangent of the polar angle.

function polarAngle ##

inline double polarAngle() const

Angle subtended by the vector and the z-axis.

function theta ##

inline double theta() const

Synonym for polarAngle.

function pseudorapidity ##

inline double pseudorapidity() const

Purely geometric approximation to rapidity.

eta = -ln[ tan(theta/2) ]

Also invariant under z-boosts, equal to y for massless particles.

Implemented using the tan half-angle formula tan(theta/2) = sin(theta) / [1 + cos(theta)] = pT / (p + pz)

function eta ##

inline double eta() const

Synonym for pseudorapidity.

function abseta ##

inline double abseta() const

Convenience shortcut for fabs(eta())

function operator+= ##

inline Vector3 & operator+=(
    const Vector3 & v
)

In-place addition operator.

function operator-= ##

inline Vector3 & operator-=(
    const Vector3 & v
)

In-place subtraction operator.

function get ##

inline const double & get(
    const size_t index
) const

function get ##

inline double & get(
    const size_t index
)

function operator[] ##

inline const double & operator[](
    const size_t index
) const

Direct access to vector elements by index.

function operator[] ##

inline double & operator[](
    const size_t index
)

Direct access to vector elements by index.

function set ##

inline Vector< N > & set(
    const size_t index,
    const double value
)

Set indexed value.

function size ##

inline constexpr size_t size() const

Vector dimensionality.

function isZero ##

inline bool isZero(
    double tolerance =1E-5
) const

Check for nullness, allowing for numerical precision.

function mod2 ##

inline double mod2() const

Calculate the modulus-squared of a vector. ( \sum_{i=1}^N x_i^2 ).

function mod ##

inline double mod() const

Calculate the modulus of a vector. ( \sqrt{\sum_{i=1}^N x_i^2} ).

function operator== ##

inline bool operator==(
    const Vector< N > & a
) const

function operator!= ##

inline bool operator!=(
    const Vector< N > & a
) const

function mkX ##

static inline Vector3 mkX()

function mkY ##

static inline Vector3 mkY()

function mkZ ##

static inline Vector3 mkZ()

Updated on 2022-08-07 at 20:17:17 +0100