  We present results of a decay width calculation for a hybrid exotic meson(h,
JPC=1-+) in the decay channel h to pi+a1. This calculation uses quenched
lattice QCD and Luescher's finite box method. Operators for the h and pi+a1
states are used in a correlation matrix which was expanded by varying the
smearing and fuzzing levels at source and sink points. Scattering phase shifts
for a discrete set of relative pi+a1 momenta are determined using eigenvalues
of the correlation matrix and formulae derived by Luescher. The phase shift
data is very sparse, but fits to a Breit-Wigner model are made, resulting in a
decay width of about 80 MeV.
