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- W4225317103 abstract "Heavy quarks placed within a hot QCD medium undergo Brownian motion, characterized by specific transport coefficients. Their determination can be simplified by expanding them in $T/M$, where $T$ is the temperature and $M$ is a heavy quark mass. The leading term in the expansion originates from the colour-electric part of a Lorentz force, whereas the next-to-leading order involves the colour-magnetic part. We measure a colour-magnetic 2-point correlator in quenched QCD at $T sim 1.2 ... 2.0 T_{rm c}^{ }$. Employing multilevel techniques and non-perturbative renormalization, a good signal is obtained, and its continuum extrapolation can be estimated. Modelling the shape of the corresponding spectral function, we subsequently extract the momentum diffusion coefficient, $kappa$. For charm (bottom) quarks, the magnetic contribution adds $sim 30%$ ($10%$) to the electric one. The same increases apply also to the drag coefficient, $eta$. As an aside, the colour-magnetic spectral function is computed at NLO." @default.
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- W4225317103 date "2022-08-10" @default.
- W4225317103 modified "2023-09-25" @default.
- W4225317103 title "Lattice study of a magnetic contribution to heavy quark momentum diffusion" @default.
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- W4225317103 doi "https://doi.org/10.1007/jhep08(2022)128" @default.
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