1. Heavy quark momentum diffusion from the lattice using gradient flow
- Author
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Lukas Mazur, Luis Altenkort, Olaf Kaczmarek, H.-T. Shu, Guy D. Moore, and Alexander M. Eller
- Subjects
Quark ,Physics ,010308 nuclear & particles physics ,High Energy Physics::Lattice ,High Energy Physics - Lattice (hep-lat) ,Isotropy ,Extrapolation ,FOS: Physical sciences ,Quenched approximation ,Fermion ,01 natural sciences ,Momentum diffusion ,High Energy Physics - Phenomenology ,High Energy Physics - Phenomenology (hep-ph) ,High Energy Physics - Lattice ,Lattice (order) ,Quantum electrodynamics ,0103 physical sciences ,Balanced flow ,010306 general physics - Abstract
We apply the gradient flow on a color-electric two-point function that encodes the heavy quark momentum diffusion coefficient. The simulations are done on fine isotropic lattices in the quenched approximation at $1.5\,T_c$. The continuum extrapolation is performed at fixed flow time followed by a second extrapolation to zero flow time. Perturbative calculations of this correlation function under Wilson flow are used to enhance the extrapolations of the non-perturbative lattice correlator. The final estimate for the continuum correlator at zero flow time largely agrees with one obtained from a previous study using the multi-level algorithm. We perform a spectral reconstruction based on perturbative model fits to estimate the heavy quark momentum diffusion coefficient. The approach we present here yields high-precision data for the correlator and is also applicable for actions with dynamical fermions., Published version, 14 pages, 15 figures
- Published
- 2021