QCD effective charge from the three-gluon vertex of the background-field method
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QCD effective charge from the three-gluon vertex of the background-field method

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QCD effective charge from the three-gluon vertex of the background-field method

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dc.contributor.author Binosi, Daniele
dc.contributor.author Ibáñez Gil de Ramales, David
dc.contributor.author Papavassiliou, Joannis
dc.date.accessioned 2014-02-19T10:23:56Z
dc.date.available 2014-02-19T10:23:56Z
dc.date.issued 2013
dc.identifier.uri http://dx.doi.org/10.1103/PhysRevD.87.125026
dc.identifier.uri http://hdl.handle.net/10550/33085
dc.description.abstract In this article we study in detail the prospects of determining the infrared finite QCD effective charge from a special kinematic limit of the vertex function corresponding to three background gluons. This particular Green's function satisfies a QED-like Ward identity, relating it to the gluon propagator, with no reference to the ghost sector. Consequently, its longitudinal form factors may be expressed entirely in terms of the corresponding gluon wave function, whose inverse is proportional to the effective charge. After reviewing certain important theoretical properties, we consider a typical lattice quantity involving this vertex, and derive its exact dependence on the various form factors, for arbitrary momenta. We then focus on the particular momentum configuration that eliminates any dependence on the (unknown) transverse form factors, projecting out only the desired quantity. A preliminary numerical analysis indicates that the effective charge is relatively insensitive to the numerical uncertainties that may afflict future simulations of the aforementioned lattice quantity. The numerical difficulties associated with a parallel determination of the dynamical gluon mass are briefly discussed.
dc.relation.ispartof Physical Review D, 2013, vol. 87, num. 12, p. 125026
dc.rights.uri info:eu-repo/semantics/openAccess
dc.source Binosi, Daniele Ibañez, D. Papavassiliou, Joannis 2013 QCD effective charge from the three-gluon vertex of the background-field method Physical Review D 87 12 125026
dc.subject Física
dc.title QCD effective charge from the three-gluon vertex of the background-field method
dc.type info:eu-repo/semantics/article
dc.date.updated 2014-02-19T10:23:56Z
dc.identifier.doi http://dx.doi.org/10.1103/PhysRevD.87.125026
dc.identifier.idgrec 091163

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