Peter Arnold, Tyler Gorda, Shahin Iqbal
Published 2021-12-09, updated 2022-08-18Version 2
Consider the in-medium splitting $g \to gg$ of a very high-energy gluon traversing a QCD medium, accounting for the Landau-Pomeranchuk-Migdal (LPM) effect. It has been known for some time that soft radiative corrections to that splitting generate a double-log correction to the splitting rate, whose effects can be absorbed into running of the medium parameter $\hat q$ describing the rate of transverse momentum kicks to high-energy particles due to small-angle scattering from the medium. Less has been known about sub-leading, single logarithms in this context. In this paper, we find analytic formulas for those single logs (with various caveats and clarifications).
Comments: 54 pages, 20 figures. Chages from v1 are superficial -- mostly a slight expansion of the introduction and conclusion
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