Abstract
Many lattice studies of heavy quark diffusion originate from a colour-electric correlator, obtained as a leading term after an expansion in the inverse of the heavy-quark mass. In view of the fact that the charm quark is not particularly heavy, we consider subleading terms in the expansion. Working out correlators up to \( \mathcal{O} \)(1/M2), we argue that the leading corrections are suppressed by \( \mathcal{O} \)(T/M), and one of them can be extracted from a colour-magnetic correlator. The corresponding transport coefficient is non-perturbative already at leading order in the weak-coupling expansion, and therefore requires a nonperturbative determination.
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Bouttefeux, A., Laine, M. Mass-suppressed effects in heavy quark diffusion. J. High Energ. Phys. 2020, 150 (2020). https://doi.org/10.1007/JHEP12(2020)150
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DOI: https://doi.org/10.1007/JHEP12(2020)150