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Type: Journal article
Title: Lattice baryon spectroscopy with multiparticle interpolators
Author: Kiratidis, A.
Kamleh, W.
Leinweber, D.
Owen, B.
Citation: Physical Review D: Particles, Fields, Gravitation and Cosmology, 2015; 91(9):094509-1-094509-13
Publisher: American Physical Society
Issue Date: 2015
ISSN: 1550-7998
Statement of
Adrian L. Kiratidis, Waseem Kamleh, Derek B. Leinweber, and Benjamin J. Owen
Abstract: In 2 + 1 flavor lattice QCD, the spectrum of the nucleon is presented for both parities using local meson-baryon-type interpolating fields in addition to the standard three-quark nucleon interpolators. The role of local five-quark operators in extracting the nucleon excited-state spectrum via correlation matrix techniques is explored on dynamical gauge fields with mπ = 293 MeV, leading to the observation of a state in the region of the noninteracting S-wave Nπ scattering threshold in the negative-parity sector. Furthermore, the robustness of the variational technique is examined by studying the spectrum on a variety of operator bases. Fitting a single-state ansatz to the eigenstate-projected correlators provides robust energies for the low-lying spectrum that are essentially invariant despite being extracted from qualitatively different bases.
Rights: © 2015 American Physical Society
DOI: 10.1103/PhysRevD.91.094509
Grant ID: ARC
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