Abstract
The FASTSUM Collaboration has calculated several quantities relevant for QCD studies at non-zero temperature using the lattice technique. We report here our results for the (i) interquark potential in charmonium; (ii) bottomonium spectral functions; and (iii) electrical conductivity. All results were obtained with 2+1 flavours of dynamical fermions on an anisotropic lattice which allows greater resolution in the temporal direction.
Highlights
The Particle Data Book [1] is a repository of particle physics knowledge, and yet it contains no entries on the deconfined phase of QCD
We present here some lattice calculations of phenomena in the quark-gluon plasma (QGP) phase with the ultimate aim of addressing this omission
I will discuss three lattice results obtained by the FASTSUM Collaboration at μ = 0 and non-zero temperature, T, above and below the deconfining temperature, Tc, all produced on our 2+1 flavour, anisotropic lattices
Summary
The Particle Data Book [1] is a repository of particle physics knowledge, and yet it contains no entries on the deconfined phase of QCD. While the lattice technique has had many successes in calculating phenomenologically relevant quantities at zero chemical potential, μ, in the confined phase of QCD, it has a significant limitation for μ > 0 This is the well-known “sign problem” which has haunted efforts to extend our knowledge into the entire (T, μ) plane. I will discuss three lattice results obtained by the FASTSUM Collaboration at μ = 0 and non-zero temperature, T , above and below the deconfining temperature, Tc, all produced on our 2+1 flavour, anisotropic lattices These topics are a calculation of the potential in the charmonium system (Sec.2), bottomonium spectral functions (Sec.3), and a determination of the electrical conductivity of QCD as a function of T (Sec.). These results contrast with the χb case where the ground state (1P) appears to melt at T ≈ Tc, see Fig. (Right)
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