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Toward the excited isoscalar meson spectrum from lattice QCD

2013; American Physical Society; Volume: 88; Issue: 9 Linguagem: Inglês

10.1103/physrevd.88.094505

1550-7998

Jo Dudek, Robert G. Edwards, Peng Guo, Christopher E. Thomas,

High-Energy Particle Collisions Research

We report on the extraction of an excited spectrum of isoscalar mesons using lattice QCD. Calculations on several lattice volumes are performed with a range of light quark masses corresponding to pion masses down to about 400 MeV. The distillation method enables us to evaluate the required disconnected contributions with high statistical precision for a large number of meson interpolating fields. We find relatively little mixing between light and strange in most JPC channels; one notable exception is the pseudoscalar sector where the approximate SU(3)F octet, singlet structure of the {\eta}, {\eta}' is reproduced. We extract exotic JPC states, identified as hybrid mesons in which an excited gluonic field is coupled to a color-octet qqbar pair, along with non-exotic hybrid mesons embedded in a qqbar-like spectrum.