Exotic hybrid mesons from improved Kogut-Susskind fermions

TL;DR

This paper reports on lattice QCD calculations of the mass of the exotic $1^{-+}$ hybrid meson using improved Kogut-Susskind fermions, comparing quenched and dynamical quark simulations and extrapolating to physical quark masses.

Contribution

It provides new lattice QCD results for the $1^{-+}$ hybrid meson mass using improved fermion actions and compares different quark simulation methods.

Findings

Mass estimates for the $1^{-+}$ hybrid meson from quenched and dynamical simulations.

Comparison of results with Wilson quark calculations.

Extrapolated meson masses to physical quark masses.

Abstract

We summarize our measurement of the mass of the exotic $1^{-+}$ hybrid meson using an improved Kogut-Susskind action. We show results from both quenched and dynamical quark simulations and compare with results from Wilson quarks. Extrapolation of these results to the physical quark mass allows comparison with experimental candidates for the $1^{-+}$ hybrid meson.