Improved Reweighting for QCD Topology at High Temperature

Understand

In a previous paper \cite{Jahn:2018dke} we presented a methodology for computing the topological susceptibility of QCD at temperatures where it is small and standard methods fail.

• Here we improve on this methodology by removing two barriers to the reweighting method's moving between topological sectors.
• We present high-statistics, continuum-extrapolated results for the susceptibility of pure-glue QCD up to $7 T_c$.
• We show that the susceptibility varies with temperature as $T^{-6.7\pm 0.3}$ between $T=2.5 T_c$ and $T=7 T_c$, in good agreement with expectations based on the dilute instanton gas approximation.