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

Registro completo de metadados
MetadadosDescriçãoIdioma
Autor(es): dc.contributorUniversidade Estadual Paulista (UNESP)-
Autor(es): dc.contributorInst. Für Theoretische Physik, Universität Heidelberg-
Autor(es): dc.creatorForkel, Hilmar-
Data de aceite: dc.date.accessioned2025-08-21T19:06:32Z-
Data de disponibilização: dc.date.available2025-08-21T19:06:32Z-
Data de envio: dc.date.issued2022-04-28-
Data de envio: dc.date.issued2022-04-28-
Data de envio: dc.date.issued2005-03-01-
Fonte completa do material: dc.identifierhttp://dx.doi.org/10.1103/PhysRevD.71.054008-
Fonte completa do material: dc.identifierhttp://hdl.handle.net/11449/224541-
Fonte: dc.identifier.urihttp://educapes.capes.gov.br/handle/11449/224541-
Descrição: dc.descriptionNonperturbative 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.-
Descrição: dc.descriptionIFT, Universidade Estadual Paulista, Rua Pamplona, 145, 01405-900 São Paulo, SP-
Descrição: dc.descriptionInst. Für Theoretische Physik, Universität Heidelberg, D-69120 Heidelberg-
Descrição: dc.descriptionIFT, Universidade Estadual Paulista, Rua Pamplona, 145, 01405-900 São Paulo, SP-
Formato: dc.format1-45-
Idioma: dc.languageen-
Relação: dc.relationPhysical Review D - Particles, Fields, Gravitation and Cosmology-
???dc.source???: dc.sourceScopus-
Título: dc.titleDirect instantons, topological charge screening, and QCD glueball sum rules-
Tipo de arquivo: dc.typelivro digital-
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