Definitions of objects inheriting from the classes defined in
helas_objects.py and which have special attributes and function devoted
to the treatment of Loop processes
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LoopHelasUVCTAmplitude
LoopHelasUVCTAmplitude object, behaving exactly as an amplitude
except that it also contains additional vertices with coupling
constants corresponding to the 'UVCTVertices' defined in the
'UVCTVertices ' of the loop_base_objects.LoopUVCTDiagram of the
LoopAmplitude.
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LoopHelasAmplitude
LoopHelasAmplitude object, behaving exactly as an amplitude except
that it also contains loop wave-functions closed on themselves,
building an amplitude corresponding to the closed loop.
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LoopHelasDiagram
LoopHelasDiagram object, behaving exactly as a Diagram except that
it has a couple of additional functions which can reconstruct and
handle loop amplitudes.
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LoopHelasMatrixElement
LoopHelasMatrixElement: list of processes with identical Helas
calls, and the list of LoopHelasDiagrams associated with the
processes.
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LoopHelasProcess
LoopHelasProcess: Analogous of HelasMultiProcess except that it is
suited for LoopAmplitude and with the peculiarity that it is always
treating only one loop amplitude.
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