Direct instantons, topological charge screening, and QCD glueball sum rules

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dc.contributor.authorForkel, Hilmar [UNESP]
dc.contributor.institutionUniversidade Estadual Paulista (UNESP)
dc.contributor.institutionInst. Für Theoretische Physik, Universität Heidelberg
dc.date.accessioned2022-04-28T20:00:42Z
dc.date.available2022-04-28T20:00:42Z
dc.date.issued2005-03-01
dc.description.abstractNonperturbative Wilson coefficients of the operator product expansion (OPE) for the spin-0 glueball correlators are derived and analyzed. A systematic treatment of the direct instanton contributions is given, based on a realistic instanton size distribution and renormalization at the operator scale. In the pseudoscalar channel, topological charge screening is identified as an additional source of (semi-) hard nonperturbative physics. The screening contributions are shown to be vital for consistency with the anomalous axial Ward identity, and previously encountered pathologies (positivity violations and the disappearance of the 0<sup>-+</sup> glueball signal) are traced to their neglect. On the basis of the extended OPE, a comprehensive quantitative analysis of eight Borel-moment sum rules in both spin-0 glueball channels is then performed. The nonperturbative OPE coefficients turn out to be indispensable for consistent sum rules and for their reconciliation with the underlying low-energy theorems. The topological short-distance physics strongly affects the sum rule results and reveals a rather diverse pattern of glueball properties. New predictions for the spin-0 glueball masses and decay constants and an estimate of the scalar glueball width are given, and several implications for glueball structure and experimental glueball searches are discussed. ©2005 The American Physical Society.en
dc.description.affiliationIFT, Universidade Estadual Paulista, Rua Pamplona, 145, 01405-900 São Paulo, SP
dc.description.affiliationInst. Für Theoretische Physik, Universität Heidelberg, D-69120 Heidelberg
dc.description.affiliationUnespIFT, Universidade Estadual Paulista, Rua Pamplona, 145, 01405-900 São Paulo, SP
dc.format.extent1-45
dc.identifierhttp://dx.doi.org/10.1103/PhysRevD.71.054008
dc.identifier.citationPhysical Review D - Particles, Fields, Gravitation and Cosmology, v. 71, n. 5, p. 1-45, 2005.
dc.identifier.doi10.1103/PhysRevD.71.054008
dc.identifier.issn1550-2368
dc.identifier.issn1550-7998
dc.identifier.scopus2-s2.0-18544366700
dc.identifier.urihttp://hdl.handle.net/11449/224541
dc.language.isoeng
dc.relation.ispartofPhysical Review D - Particles, Fields, Gravitation and Cosmology
dc.sourceScopus
dc.titleDirect instantons, topological charge screening, and QCD glueball sum rulesen
dc.typeArtigo

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