align

import ampform.helicity.align

Different formalisms for aligning amplitudes in different sub-systems.

class SpinAlignment

Bases: ABC

abstract formulate_amplitude(reaction: ReactionInfo) → Expr

abstract define_symbols(reaction: ReactionInfo) → dict[Symbol, Expr]

class NoAlignment

Bases: SpinAlignment

Sum the amplitudes without any spin alignment.

static formulate_amplitude(reaction: ReactionInfo) → Expr

static define_symbols(reaction: ReactionInfo) → dict[Symbol, Expr]

Submodules and Subpackages

• axisangle
  • AxisAngleAlignment
    • AxisAngleAlignment.formulate_amplitude()
    • AxisAngleAlignment.define_symbols()
  • formulate_axis_angle_alignment()
  • formulate_rotation_chain()
  • formulate_helicity_rotation_chain()
  • formulate_wigner_rotation()
  • formulate_helicity_rotation()
  • get_opposite_helicity_sign()
• dpd
  • DalitzPlotDecomposition
    • DalitzPlotDecomposition.reference_subsystem
    • DalitzPlotDecomposition.formulate_amplitude()
    • DalitzPlotDecomposition.define_symbols()
  • T
  • relabel_edge_ids()