Hybrid Meson Spectrum from the FLIC action

TL;DR

This paper investigates the spectral properties of hybrid mesons using improved lattice operators, successfully isolating ground states and providing data on exotic and excited mesons.

Contribution

It introduces a novel approach with smeared-source fermion and chromo-field operators to study hybrid mesons, including exotic states, on the lattice.

Findings

Ground state mesons effectively isolated with hybrid operators

Effective mass of the exotic 1^{-+} meson reported

Some excited mesonic states characterized using variational methods

Abstract

The spectral properties of hybrid meson interpolating fields are investigated. The quantum numbers of the meson are carried by smeared-source fermion operators and highly-improved chromo-electric and -magnetic field operators composed with APE-smeared links. The effective masses of standard and hybrid operators indicate that the ground state meson is effectively isolated using both standard and hybrid interpolating fields. Focus is placed on interpolating fields in which the large spinor components of the quark and antiquark fields are merged. In particular, the effective mass of the exotic $1^{-+}$ meson is reported. Further, we report some values for excited mesonic states using a variational process.