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Pinch technique at two loops: The case of massless Yang-Mills theories

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Pinch technique at two loops: The case of massless Yang-Mills theories

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dc.contributor.author Papavassiliou, Joannis
dc.date.accessioned 2015-04-10T08:21:42Z
dc.date.available 2015-04-10T08:21:42Z
dc.date.issued 2000
dc.identifier.citation Papavassiliou, Joannis 2000 Pinch technique at two loops: The case of massless Yang-Mills theories Physical Review D 62 4 045006
dc.identifier.uri http://hdl.handle.net/10550/43002
dc.description.abstract The generalization of the pinch technique beyond one loop is presented. It is shown that the crucial physical principles of gauge-invariance, unitarity, and gauge-fixing-parameter independence single out at two loops exactly the same algorithm which has been used to define the pinch technique at one loop, without any additional assumptions. The two-loop construction of the pinch technique gluon self-energy, and quark-gluon vertex are carried out in detail for the case of mass-less Yang-Mills theories, such as perturbative QCD. We present two different but complementary derivations. First we carry out the construction by directly rearranging two-loop diagrams. The analysis reveals that, quite interestingly, the well-known one-loop correspondence between the pinch technique and the background field method in the Feynman gauge persists also at two-loops. The renormalization is discussed in detail, and is shown to respect the aforementioned correspondence. Second, we present an absorptive derivation, exploiting the unitarity of the S-matrix and the underlying BRS symmetry; at this stage we deal only with tree-level and one-loop physical amplitudes. The gauge-invariant sub-amplitudes defined by means of this absorptive construction correspond precisely to the imaginary parts of the n-point functions defined in the full two-loop derivation, thus furnishing a highly non-trivial self-consistency check for the entire method. Various future applications are briefly discussed.
dc.language.iso eng
dc.relation.ispartof Physical Review D, 2000, vol. 62, num. 4, p. 045006
dc.subject Física
dc.title Pinch technique at two loops: The case of massless Yang-Mills theories
dc.type journal article es_ES
dc.date.updated 2015-04-10T08:21:42Z
dc.identifier.doi 10.1103/PhysRevD.62.045006
dc.identifier.idgrec 091144
dc.rights.accessRights open access es_ES

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