Lattice NRQCD study of quarkonium at non-zero temperature

TL;DR

This study uses lattice NRQCD to analyze how charmonium and bottomonium properties change at different temperatures, revealing that charmonium is more sensitive to temperature increases, consistent with sequential melting.

Contribution

It provides a detailed lattice NRQCD analysis of quarkonium correlators at finite temperature, highlighting the differential temperature dependence of charmonium and bottomonium.

Findings

Charmonium correlators show stronger temperature dependence than bottomonium.

Results support the sequential quarkonium melting hypothesis.

Temperature effects vary between different quarkonium states.

Abstract

To study the in-medium modification of quarkonium properties, charmonium correlators at $140.4 (\beta =6.664) \le T \le 221 (\beta = 7.280)$ (MeV) are calculated using the NRQCD formalism on $48^3 \times 12$ gauge configurations with dynamical $N_f = 2 + 1$ flavors of Highly Improved Staggered Quarks (HISQ). To determine the "zero energy shift" for these lattices, we perform a fine zero temperature scan ($\beta =6.664, 6.740, 6.800, 6.880, 6.950, 7.030, 7.150$ and $7.280$). We find that the temperature dependence of charmonium correlators is stronger than the temperature dependence of bottomonium correlators in a given channel. This fits into the expected pattern of sequential quarkonium melting.