Speaker
Description
We investigate meson-glueball mixing on the lattice by means of improved interpolating operators. On the meson side, we extend the Hadron Spectrum Collaboration's derivative-based basis with optimal distillation profiles, resulting in a clearer resolution of the spectrum. On the glueball side, we build operators using the chromo-magnetic field and its gauge-covariant derivatives which couple strongly to states with fixed continuum $J^{PC}$, making them a better-conditioned basis compared to spatial Wilson loops generally used in lattice glueball studies. We map the low-lying scalar iso-vector and iso-scalar spectrum in a simulation with 2 degenerate quarks at $m_{\pi} \approx 2.2$ GeV using these meson and glueball operators, as well as quantify how these operators couple to the energy eigenstates to understand the composition of these states.