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object --+ | diagram_generation.DiagramTag --+ | 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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dec_number = 1
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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).
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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. |
Move the wavefunction part of vertex id appropriately
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