Light-Quark FLIC Fermion Simulations of the $1^{-+}$ Exotic Meson
  We investigate the mass of the $1^{-+}$ exotic meson, created with hybrid interpolating fields. Access to light quark masses approaching 25 MeV is facilitated by the use of the Fat-Link Irrelevant Clover (FLIC) fermion action, and large ($20^3 \times 40$) lattices. Our results indicate that the $1^{-+}$ exotic exhibits significant curvature close to the chiral limit, and yield a $1^{-+}$ mass in agreement with the $\pi_1 (1600)$ candidate and exclusive of the $\pi_1 (1400)$. 
J.N. Hedditch, W. Kamleh, B.G. Lasscock, D.B. Leinweber, A.G.   Williams, J.M. Zanotti