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Type: Journal article
Title: 1⁻⁺ exotic meson at light quark masses
Other Titles: 1(-+) exotic meson at light quark masses
Author: Hedditch, J.
Kamleh, W.
Lasscock, B.
Leinweber, D.
Williams, A.
Citation: Physical Review D: Particles, Fields, Gravitation and Cosmology, 2005; 72(11):114507-1-114507-8
Publisher: American Physical Soc
Issue Date: 2005
ISSN: 1550-7998
Statement of
J. N. Hedditch, W. Kamleh, B. G. Lasscock, D. B. Leinweber, A. G. Williams and J.M. Zanotti
Abstract: The mass of the 1⁻⁺ exotic meson, created with hybrid interpolating fields, is explored in numerical simulations of quenched QCD on large (20³×40) lattices to obtain good control of statistical and finite volume errors. Using the Fat-Link Irrelevant Clover (FLIC) fermion action, the properties of the 1⁻⁺ are investigated at light quark masses approaching 25 MeV (mπ/mρ≃1/3). Under the standard assumption that the coupling to the quenched a1η′ channel comes with a negative metric, our results indicate that the 1-+ exotic exhibits significant curvature close to the chiral limit, suggesting previous linear extrapolations have overestimated the mass of the 1⁻⁺. We find for the first time in lattice studies a 1⁻⁺ mass consistent with the π1(1600) candidate. We also find a strangeness ±1 JP=1- state with a mass close to 2 GeV.
Rights: ©2005 American Physical Society
DOI: 10.1103/PhysRevD.72.114507
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