Hybrid and Exotic Mesons from FLIC Fermions

TL;DR

This paper investigates the spectral properties of hybrid mesons using improved fermion operators and field operators, successfully isolating ground states and exploring exotic meson states with a variational approach.

Contribution

It introduces a novel combination of smeared-source fermion and chromo-field operators to study hybrid mesons, including exotic states, with improved spectral analysis techniques.

Findings

Ground state mesons effectively isolated with both standard and hybrid operators.

Effective mass of 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 port some values for excited mesonic states using a variational process.