Tuning anisotropies for dynamical gauge configurations

Abstract

We present methods and results for the tuning of quark and gluon anisotropies for improved actions in N f = 2 QCD.

Charmonium spectroscopy on dynamical anisotropic lattices

“…We find a renormalized anisotropy determined at the charm quark mass which is significantly higher than what is found at the strange quark mass [14]. This discrepancy may be due to aM errors, but it may also have its origins in the different methods used to determine the anisotropy (point propagators in [14] vs. all-to-all propagators here), combined with the short temporal extent of our lattice. This is currently under investigation, using lattices with a longer time extent.…”

Dynamical QCD simulations on anisotropic lattices

“…These lattices will in the future be employed for a wide range of physics investigations, including charm physics and heavy exotics [16], spectral functions at high temperature [19], static-light mesons and baryons [20], strong decays and flavour singlets including glueballs. These studies will be carried out on larger lattice volumes.…”

An Introduction to the Spectral Analysis of the QGP

“…The ideal way to resolve the above ambiguity would be to calculate the cc spectrum directly on the lattice, and this is indeed what lattice studies aim to do [11,12,13,14,15,16]. More specifically, they calculate the cc spectrum σ(ω, T ) in the appropriate quantum channel, as a function of the temperature T and the cc energy ω. Boundstates show up as resonances in a plot of σ versus ω.…”

“…Since at high energy, the dominant part of Scc comes from gluon fusion (Fig. 1.10), we can write 16) with gp(x) and gt(x) denoting the gluon densities and x1 and x2 the fractional momenta of the gluons from projectile and target, respectively; σ is the gg → cc cross section.…”