The total symmetry factor is 2, and the contribution of this diagram is divided by 2.
2.
If one encounters ( identical ) copies of a component within the Feynman diagram one has to include a " symmetry factor ".
3.
The symmetry factor theorem gives the symmetry factor for a general diagram : the contribution of each Feynman diagram must be divided by the order of its group of automorphisms, the number of symmetries that it has.
4.
The symmetry factor theorem gives the symmetry factor for a general diagram : the contribution of each Feynman diagram must be divided by the order of its group of automorphisms, the number of symmetries that it has.
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