Lattice calculation of $1^{-+}$ hybrid mesons with improved Kogut-Susskind fermions

Details Lattice calculation of $1^{-+}$ hybrid mesons with improved Kogut-Susskind fermions Lattice calculation of $1^{-+}$ hybrid mesons with improved Kogut-Susskind fermions

2003-01-23

arxiv.org/abs/hep-lat/0301024v2

Phys.Rev.D68:074505,2003

Physics

High Energy Physics

High Energy Physics - Lattice

24 pages, 12 figures. Replaced to match published version

Scientific paper

10.1103/PhysRevD.68.074505

We report on a lattice determination of the mass of the exotic $1^{-+}$ hybrid meson using an improved Kogut-Susskind action. Results from both quenched and dynamical quark simulations are presented. We also compare with earlier results using Wilson quarks at heavier quark masses. The results on lattices with three flavors of dynamical quarks show effects of sea quarks on the hybrid propagators which probably result from coupling to two meson states. We extrapolate the quenched results to the physical light quark mass to allow comparison with experimental candidates for the $1^{-+}$ hybrid meson. The lattice result remains somewhat heavier than the experimental result, although it may be consistent with the $\pi_1(1600)$.

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