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Massless bound-state excitations and the Schwinger mechanism in QCD

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Massless bound-state excitations and the Schwinger mechanism in QCD

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dc.contributor.author Aguilar, Arlene Cristina
dc.contributor.author Ibáñez Gil de Ramales, David
dc.contributor.author Mathieu, Vincent
dc.contributor.author Papavassiliou, Joannis
dc.date.accessioned 2015-04-23T08:18:27Z
dc.date.available 2015-04-23T08:18:27Z
dc.date.issued 2012
dc.identifier.citation Aguilar, Arlene Cristina Ibáñez Gil de Ramales, David Mathieu, Vincent Papavassiliou, Joannis 2012 Massless bound-state excitations and the Schwinger mechanism in QCD Physical Review D 85 1 014018-1 014018-21
dc.identifier.uri http://hdl.handle.net/10550/43297
dc.description.abstract The gauge invariant generation of an effective gluon mass proceeds through the well-known Schwinger mechanism, whose key dynamical ingredient is the nonperturbative formation of longitudinally coupled massless bound-state excitations. These excitations introduce poles in the vertices of the theory, in such a way as to maintain the Slavnov-Taylor identities intact in the presence of massive gluon propagators. In the present work we first focus on the modifications induced to the nonperturbative three-gluon vertex by the inclusion of massless two-gluon bound-states into the kernels appearing in its skeleton-expansion. Certain general relations between the basic building blocks of these bound-states and the gluon mass are then obtained from the Slavnov-Taylor identities and the Schwinger-Dyson equation governing the gluon propagator. The homogeneous Bethe-Salpeter equation determining the wave-function of the aforementioned bound state is then derived, under certain simplifying assumptions. It is then shown, through a detailed analytical and numerical study, that this equation admits non-trivial solutions, indicating that the QCD dynamics support indeed the formation of such massless bound states. These solutions are subsequently used, in conjunction with the aforementioned relations, to determine the momentum-dependence of the dynamical gluon mass. Finally, further possibilities and open questions are briefly discussed.
dc.language.iso eng
dc.relation.ispartof Physical Review D, 2012, vol. 85, num. 1, p. 014018-1-014018-21
dc.subject Física
dc.title Massless bound-state excitations and the Schwinger mechanism in QCD
dc.type journal article es_ES
dc.date.updated 2015-04-23T08:18:27Z
dc.identifier.doi 10.1103/PhysRevD.85.014018
dc.identifier.idgrec 080418
dc.rights.accessRights open access es_ES

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