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New method for determining the quark-gluon vertex

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New method for determining the quark-gluon vertex

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dc.contributor.author Aguilar, Arlene Cristina
dc.contributor.author Binosi, Daniele
dc.contributor.author Ibáñez Gil de Ramales, David
dc.contributor.author Papavassiliou, Joannis
dc.date.accessioned 2015-04-10T07:43:45Z
dc.date.available 2015-04-10T07:43:45Z
dc.date.issued 2014
dc.identifier.citation Aguilar, Arlene Cristina Binosi, Daniele Ibáñez Gil de Ramales, David Papavassiliou, Joannis 2014 New method for determining the quark-gluon vertex Physical Review D 90 6 065027-1 065027-26
dc.identifier.uri http://hdl.handle.net/10550/42973
dc.description.abstract We present a novel nonperturbative approach for calculating the form factors of the quark-gluon vertex in terms of an unknown three-point function, in the Landau gauge. The key ingredient of this method is the exact all-order relation connecting the conventional quark-gluon vertex with the corresponding vertex of the background field method, which is Abelian-like. When this latter relation is combined with the standard gauge technique, supplemented by a crucial set of transverse Ward identities, it allows the approximate determination of the nonperturbative behavior of all 12 form factors comprising the quark-gluon vertex, for arbitrary values of the momenta. The actual implementation of this procedure is carried out in the Landau gauge, in order to make contact with the results of lattice simulations performed in this particular gauge. The most demanding technical aspect involves the approximate calculation of the components of the aforementioned (fully dressed) three-point function, using lattice data as input for the gluon propagators appearing in its diagrammatic expansion. The numerical evaluation of the relevant form factors in three special kinematical configurations (soft-gluon and quark symmetric limit, zero quark momentum) is carried out in detail, finding qualitative agreement with the available lattice data. Most notably, a concrete mechanism is proposed for explaining the puzzling divergence of one of these form factors observed in lattice simulations.
dc.language.iso eng
dc.relation.ispartof Physical Review D, 2014, vol. 90, num. 6, p. 065027-1-065027-26
dc.subject Física
dc.title New method for determining the quark-gluon vertex
dc.type journal article es_ES
dc.date.updated 2015-04-10T07:43:46Z
dc.identifier.doi 10.1103/PhysRevD.90.065027
dc.identifier.idgrec 102032
dc.rights.accessRights open access es_ES

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