Exotic Meson Decay Widths using Lattice QCD

Abstract

A decay width calculation for a hybrid exotic meson h, with JPC=1-+, is presented for the channel h->pi+a1. This quenched lattice QCD simulation employs Luescher's finite box method. Operators coupling to the h and pi+a1 states are used at various levels of smearing and fuzzing, and at four quark masses. Eigenvalues of the corresponding correlation matrices yield energy spectra that determine scattering phase shifts for a discrete set of relative pi+a1 momenta. Although the phase shift data is sparse, fits to a Breit-Wigner model are attempted, resulting in a decay width of about 60 MeV when averaged over two lattice sizes.

9 pages, 8 figures, RevTex4, minor change to Fig. 1

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Cited by in corpus (6)

• Glueballs, Hybrids, Multiquarks. Experimental facts versus QCD inspired concepts
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• Hadronic decays from the lattice
• Volume Dependence of Spectral Weights for Unstable Particles in a Solvable Model
• Mass spectrum of 1-+ exotic mesons from lattice QCD
• Experimental Status of Exotic Mesons and the GlueX Experiment