Class IdentifyMETag
source code
object --+
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diagram_generation.DiagramTag --+
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IdentifyMETag
DiagramTag daughter class to identify processes with identical matrix
elements. Need to compare leg number, color, lorentz, coupling, state,
spin, self_antipart, mass, width, color, decay and is_part.
Note that we also need to check that the processes agree on
has_mirror_process, process id, and identical_particle_factor. Don't
allow combining decay chains.
We also don't want to combine processes with different possibly
onshell s-channel propagators (i.e., with non-zero width and onshell=True
or None) since we want the right propagator written in the event file in
the end. This is done by the vertex.
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Inherited from diagram_generation.DiagramTag:
__eq__,
__gt__,
__init__,
__lt__,
__ne__,
__repr__,
__str__,
get_external_numbers
Inherited from object:
__delattr__,
__format__,
__getattribute__,
__hash__,
__new__,
__reduce__,
__reduce_ex__,
__setattr__,
__sizeof__,
__subclasshook__
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create_tag(amplitude,
identical_particle_factor=0)
Create a tag which identifies identical matrix elements |
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prepare_comp_dict(process,
numbers)
Prepare a dictionary from leg number to [positions] in such a way
that identical particles are treated in a symmetric way |
source code
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link_from_leg(leg,
model)
Returns the end link for a leg needed to identify matrix elements:
((leg numer, state, spin, self_antipart, mass, width, color, decay
and is_part), number). |
source code
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vertex_id_from_vertex(vertex,
last_vertex,
model,
ninitial)
Returns the info needed to identify matrix elements: interaction
color, lorentz, coupling, and wavefunction spin, self_antipart, mass,
width, color, decay and is_part, plus PDG code if possible onshell
s-channel prop. |
source code
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Inherited from diagram_generation.DiagramTag:
reorder_permutation
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Inherited from object:
__class__
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vertex_id_from_vertex(vertex,
last_vertex,
model,
ninitial)
Static Method
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Returns the info needed to identify matrix elements: interaction
color, lorentz, coupling, and wavefunction spin, self_antipart, mass,
width, color, decay and is_part, plus PDG code if possible onshell
s-channel prop. Note that is_part and PDG code needs to be flipped if we
move the final vertex around.
- Overrides:
diagram_generation.DiagramTag.vertex_id_from_vertex
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