2017/02/08 by Seyong Kim, Kim, Seyong
Physics and Astronomy · #FOS: Physical sciences #High Energy Physics - Lattice (hep-lat) #High Energy Physics - Phenomenology (hep-ph) #High-Energy Particle Collisions Research #Nuclear Theory (nucl-th) #Particle physics theoretical and experimental studies #Quantum Chromodynamics and Particle Interactions
paper · pdf · doi:10.48550/arxiv.1702.02297
openalex publication_date 2017/02/08 · openalex created_date 2025/10/10 · openalex updated_date 2026/07/28
Recent progresses in lattice studies of heavy quark and quarkonium at non-zero temperature are discussed. Formulating a tail of spectral functions as a transport coefficient allows lattice determination of momentum diffusion coefficient (κ) for charm quark in the heavy quark mass limit and lattice determination of heavy quark/heavy anti-quark chemical equilibration rate in NRQCD. Quenched lattice study on a large volume gives κ/T3 = 1.8 ⋯ 3.4 in the continuum limit. A recent study with Nf = 2+1 configurations estimates the charmonium chemical equilibration rate Γ\rm chem. At T = 400 MeV with M ∼ 1.5 GeV, Γ\rm chem-1 ∼ 150 fm/c. Earlier results from the two studies (with different lattice setups and with different Bayesian priors) which calculate bottomonium correlators using NRQCD and employ Bayesian method to calculate spectral functions are summarized: Υ(1S) survives upto T ∼ 1.9 Tc and excited states of Υ are sequentially suppressed. The spectral functions of χb1 channel shows a Bayesian prior dependence of its thermal behavior: the χb1 spectral function with MEM prior shows melting above Tc but that with a new Bayesian prior hints survival of χb1 upto ∼ 1.6 Tc. Preliminary results from the efforts to understand the difference in the behavior of χb1 spectral function is given.