Direct instantons and nucleon magnetic moments

• Verfasst von: Aw, Mountaga [VerfasserIn]
• Verfasst von: Banerjee, M. K. [VerfasserIn]
• Verfasst von: Forkel, Hilmar [VerfasserIn]
• Titel: Direct instantons and nucleon magnetic moments
• Verf.angabe: M. Aw and M.K. Banerjee (Department of Physics, University of Maryland, College Park, MD 20742-4111), H. Forkel (Institut für Theoretische Physik, Universität Heidelberg, D-69120 Heidelberg, Germany)
• Jahr: 1999
• Umfang: 17 S.
• Fussnoten: Gesehen am 09.08.2019
• Titel Quelle: Enthalten in: De.arxiv.org
• Ort Quelle: [S.l.] : Arxiv.org, 1991
• Jahr Quelle: 1999
• Band/Heft Quelle: (1999) Artikel-Nummer 9902458, 17 Seiten
• Datenträger: Online-Ressource
• Sprache: eng
• Sach-SW: High Energy Physics - Phenomenology
• Sach-SW: Nuclear Theory
• K10plus-PPN: 1570426783

Abstract

We calculate the leading direct-instanton contributions to the operator product expansion of the nucleon correlator in a magnetic background field and set up improved QCD sum rules for the nucleon magnetic moments. Remarkably, the instanton contributions are found to affect only those sum rules which had previously been considered unstable. The new sum rules show good stability and reproduce the experimental values of the nucleon magnetic moments with values of $\chi$, the quark condensate magnetic susceptibility, consistent with other estimates.