Decay width of light quark hybrid meson from the lattice

Abstract

Lattice QCD with $N_f=2$ flavours of sea quark is used to explore the spectrum and decay of a $J^{PC}=1^{-+}$ spin-exotic hybrid meson. We test lattice determination of S-wave decay amplitudes at threshold using $b_1\to \ddot{I}€\ddot{I}‰$ where agreement with data is found. We find a hybrid meson state at 2.2(2) GeV with a partial width to $\ddot{I}€b_1$ of 400(120) MeV and to $\ddot{I}€f_1$ of 90(60) MeV.

16 pages, 4 ps figures, version accepted for publication in Phys Rev D