Exploring the anisotropic HISQ (aHISQ) action
Proceedings of The 40th International Symposium on Lattice Field Theory — PoS(LATTICE2023)(2024)
摘要
The fate of heavy quarkonia states in quark-gluon plasma is encoded in the
temperature dependence of their spectral functions. Reconstruction of spectral
functions from Euclidean lattice correlators is an ill-posed problem. Despite a
variety of techniques developed recently, many questions remain unresolved. It
is known that the situation may be improved using anisotropic ensembles that
provide finer resolution in the temporal direction. To date, the effort focused
on Wilson fermions. We report on our first study with anisotropic improved
staggered quarks. To compute the spectrum of the anisotropic Highly Improved
Staggered Quarks (aHISQ) we generated a library of anisotropic pure gauge
ensembles. We discuss the gauge anisotropy tuning that is performed with the
Wilson and Symanzik gradient flow, as well as tuning of the strange quark mass
and quark anisotropy with aHISQ, using spectrum measurements on quenched
ensembles. Finally, we discuss the impact of anisotropy on pion taste
splittings for aHISQ.
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