Optimizing Distillation for charmonium and glueballs

TL;DR

This paper investigates the charmonium spectrum using lattice QCD with two heavy dynamical quarks, employing distillation techniques to improve state overlap, and provides preliminary glueball spectrum results.

Contribution

It introduces a robust lattice QCD approach with exact distillation and high statistics to accurately determine the charmonium spectrum and offers initial insights into glueball states.

Findings

Robust charmonium spectrum results with no light quark contamination

Enhanced state overlap using distillation with various smearing profiles

Preliminary glueball spectrum estimates in the same framework

Abstract

We study the charmonium spectrum on an ensemble with two heavy dynamical quarks with a mass at half the physical charm quark mass. Operators for different quantum numbers are used in the framework of distillation with different smearing profiles to increase the overlap with ground and excited states. The use of exact distillation, large statistics and the absence of light quarks gives robust results for the charmonium spectrum. We also present preliminary results for the glueball spectrum in this theory.