feynlag.pheno.calculator.DecayChannel

class feynlag.pheno.calculator.DecayChannel(parent, children, width, vertex=None, color_factor=1, symmetry_factor=1)

One two-body channel and its partial width.

Parameters:

• parent (Expr)

• children (tuple)

• width (Expr)

• vertex (object)

• color_factor (Expr)

• symmetry_factor (Expr)

parent

the decaying field symbol.

Type:

sympy.core.expr.Expr

children

the two daughter symbols.

Type:

tuple

width

the symbolic partial width.

Type:

sympy.core.expr.Expr

vertex

the DecayVertex behind it.

Type:

object

color_factor

colour multiplicity applied (N_c, default 1).

Type:

sympy.core.expr.Expr

symmetry_factor

1/2 for identical daughters, else 1.

Type:

sympy.core.expr.Expr

__init__(parent, children, width, vertex=None, color_factor=1, symmetry_factor=1)

Parameters:

• parent (Expr)

• children (tuple)

• width (Expr)

• vertex (object)

• color_factor (Expr)

• symmetry_factor (Expr)

Return type:

None

Methods

__init__(parent, children, width[, vertex, ...])

Attributes

color_factor
symmetry_factor
vertex
parent
children
width