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تسجيل مستخدم جديدThree-point vertex functions in Yang-Mills Theory and QCD in Landau gauge
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Solutions for the three-gluon and quark-gluon vertices from Dyson-Schwinger equations and the three-particle irreducible formalism are discussed. Dynamical quarks (``unquenching) change the three-gluon vertex via the quark-triangle diagrams which themselves include fully dressed quark-gluon vertex functions. On the other hand, the quark-swordfish diagram is, at least with the model used for the two-quark-two-gluon vertex employed here, of minor importance. For the leading tensor structure of the three-gluon vertex the unquenching effect can be summarized for the nonperturbative part as a shift of the related dressing function towards the infrared.
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