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object --+ | diagram_generation.DiagramTag --+ | CanonicalConfigTag
DiagramTag daughter class to create canonical order of config. Need to compare leg number, mass, width, and color. Also implement find s- and t-channels from the tag. Warning! The sorting in this tag must be identical to that of IdentifySGConfigTag in diagram_symmetry.py (apart from leg number) to make sure symmetry works!
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Get s and t channels from the tag, as two lists of vertices ordered from the outermost s-channel and in/down towards the highest number initial state leg. Algorithm: Start from the final tag. Check for final leg number for all links and move in the direction towards leg 2 (or 1, if 1 and 2 are in the same direction). |
Returns the end link for a leg needed to identify configs: ((leg numer, mass, width, color), number).
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Returns the info needed to identify configs: interaction color, mass, width. Also provide propagator PDG code. The third element of the tuple vertex_id serves to store potential necessary information regarding the shrunk loop. |
Move the wavefunction part of propagator id appropriately
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Return a leg from a link
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Return a vertex given a leg list and a vertex id |
Return the numerical vertex id from a link.vertex_id |
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