In-medium static inter-quark potential on high resolution quenched lattices
arxiv(2024)
摘要
We re-investigate the interactions between static color sources in a finite
temperature gluonic medium using both high resolution isotropic and anisotropic
quenched lattice QCD ensembles. The underlying ill-posed inverse problem,
related to the extraction of spectral functions, is attacked with a range of
different methods, including Bayesian inference, Padé interpolation and model
fits. Among the latter we include a tail amended Gaussian ansatz and a
HTL-inspired fit ansatz. We reconfirm the presence of a dominant low-lying
spectral feature that supports the existence of a potential picture for the
in-medium evolution of the static charges at late real times. Using the raw
unmodified lattice data, all applicable methods show clear signs of screening
of the real-part of the potential. After applying a subtraction procedure
featured in a previous study we find however that screening disappears from the
extracted potential. Paths towards the resolution of this puzzle are discussed.
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