- graphicle.transform.split_momentum(momentum: MomentumArray, z: float, angle: float, axis: tuple[float, float] | SphericalAngle) MomentumArray[source]
Splits the momentum of the given particle into two momenta. Energy and 3-momentum is conserved. Hardness and collinearity of the split are determined by
zandangle.New in version 0.4.0.
- Parameters:¶
- momentum : MomentumArray¶
Four-momentum prior to splitting. Must contain only one element.
- z : float¶
Energy fraction retained by the first child after the split. Must be in range
0.0 < z <= 0.5.- angle : float¶
Angular displacement of the first child after the split.
- axis : SphericalAngle or tuple[float, float], optional¶
The theta and phi values of the axis vector about which to rotate the momentum. If
None, will choose the axis normal to the plane swept out by the hardest and softest momentum constituents.
- Returns:¶
Four-momenta of two particles produced by splitting.
- Return type:¶
See also
soft_hard_axisAxis of plane swept by softest and hardest momenta.
rotation_matrixMatrix to rotate 3-vectors about a given axis.
Last update:
Jun 27, 2025