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Type: Journal article
Title: Flavor-singlet baryons in the graded symmetry approach to partially quenched QCD
Author: Hall, J.
Leinweber, D.
Citation: Physical Review D: Particles, Fields, Gravitation and Cosmology, 2016; 94(9):094004-1-094004-10
Publisher: American Physical Society
Issue Date: 2016
ISSN: 1550-7998
Statement of
Jonathan M. M. Hall and Derek B. Leinweber
Abstract: Progress in the calculation of the electromagnetic properties of baryon excitations in lattice QCD presents new challenges in the determination of sea-quark loop contributions to matrix elements. A reliable estimation of the sea-quark loop contributions represents a pressing issue in the accurate comparison of lattice QCD results with experiment. In this article, an extension of the graded symmetry approach to partially quenched QCD is presented, which builds on previous theory by explicitly including flavor-singlet baryons in its construction. The formalism takes into account the interactions among both octet and singlet baryons, octet mesons, and their ghost counterparts; the latter enables the isolation of the quark-flow disconnected sea-quark loop contributions. The introduction of flavor-singlet states enables systematic studies of the internal structure of Λ-baryon excitations in lattice QCD, including the topical Λ(1405).
Description: Published 4 November 2016
Rights: © 2016 American Physical Society.
DOI: 10.1103/PhysRevD.94.094004
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