Hedditch, J.Kamleh, W.Lasscock, B.Leinweber, D.Williams, A.2006-12-032006-12-032005Physical Review D: Particles, Fields, Gravitation and Cosmology, 2005; 72(11):114507-1-114507-81550-79980556-2821http://hdl.handle.net/2440/17575The 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.en©2005 American Physical SocietyJournal article002005183310.1103/PhysRevD.72.1145070002342744000352-s2.0-2984443423254056Kamleh, W. [0000-0002-6177-5366]Leinweber, D. [0000-0002-4745-6027]Williams, A. [0000-0002-1472-1592]