Charmonium and bottomonium spectral functions in the vector channel

TL;DR

This study uses lattice QCD simulations to analyze charmonium and bottomonium spectral functions in the vector channel across a range of temperatures, revealing insights into quarkonium dissociation and heavy quark diffusion.

Contribution

First lattice QCD study to analyze quarkonium spectral functions in the vector channel at high temperatures with relativistic treatment of charm and bottom quarks.

Findings

Quarkonium spectral functions show temperature-dependent dissociation.

Heavy quark diffusion coefficients estimated from spectral functions.

Relativistic treatment improves spectral function accuracy.

Abstract

In this paper we report our results on quarkonium spectral functions in the vector channel obtained from quenched lattice QCD simulations at $T\in[0.75, 2.25]~T_c$. The calculations have been performed on very large and fine isotropic lattices where both charm and bottom quarks can be treated relativistically. The spectral functions are reconstructed using the Maximum Entropy Method. We study the dissociation of quarkonium states from the temperature dependence of the spectral functions and estimate heavy quark diffusion coefficients using the low-frequency behavior of the vector spectral functions.