PtEtaPhiMLorentzVector

class coffea.nanoevents.methods.vector.PtEtaPhiMLorentzVector[source]

A Lorentz vector using pseudorapidity and mass

This mixin class requires the parent class to provide items pt, eta, phi, and mass. Some additional properties are overridden for performance

Attributes Summary

`E`	Alias for `t`
`eta`	Pseudorapidity
`mass`	Invariant mass (+, -, -, -)
`mass2`	Squared `mass`
`phi`	Azimuthal angle relative to X axis in XY plane
`pt`	Alias for `r`
`r`	Distance from origin in XY plane
`rho`	Distance from origin in 3D
`rho2`	Squared `rho`
`t`	Cartesian time component
`theta`	Inclination angle from XY plane
`z`	Cartesian z value

Methods Summary

`multiply`(other)	Multiply this vector by a scalar elementwise using `x`, `y`, `z`, and `t` components
`negative`()	Returns the negative of the vector

Attributes Documentation

Pseudorapidity

\(-\ln\tan(\theta/2) = \text{arcsinh}(z/r)\)

mass

Invariant mass (+, -, -, -)

\(\sqrt{t^2-x^2-y^2-z^2}\)

Azimuthal angle relative to X axis in XY plane

\(\text{arctan2}(y, x)\)

Distance from origin in XY plane

\(\sqrt{x^2+y^2} = \rho \sin(\theta)\)

Distance from origin in 3D

\(\sqrt{x^2+y^2+z^2} = \sqrt{r^2+z^2}\)

Cartesian time component

\(\sqrt{\rho^2+m^2}\)

theta

Inclination angle from XY plane

\(\text{arctan2}(r, z) = 2\text{arctan}(e^{-\eta})\)

Cartesian z value

\(\rho \cos(\theta) = r \sinh(\eta)\)

Methods Documentation

multiply(other)[source]

Multiply this vector by a scalar elementwise using x, y, z, and t components

In reality, this directly adjusts pt, eta, phi and mass for performance