Meson correlation functions at high temperatures

TL;DR

This paper investigates meson correlation functions at high temperatures using lattice QCD, focusing on controlling cut-off and finite-volume effects, and analyzing screening masses above the deconfining temperature.

Contribution

It provides preliminary lattice results for meson correlation and spectral functions at high temperatures, comparing different fermion actions and extrapolating screening masses.

Findings

Screening masses increase above the deconfining temperature.

Hypercube fermion action shows reduced cut-off effects.

Results guide understanding of meson behavior in quark-gluon plasma.

Abstract

We present preliminary results for the correlation- and spectral functions of different meson channels on the lattice. The main focus lies on gaining control over cut-off as well as on the finite-volume effects. Extrapolations of screening masses above the deconfining temperature are guided by the result of the free ($T=\infty$) case on the lattice and in the continuum. We study the quenched non-perturbatively improved Wilson-clover fermion as well as the hypercube fermion action which might show less cut-off effects.