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arXiv · 2601.21655

Cone-Dependent Jet Collisional Energy Loss in Finite QCD Medium

Magdalena Djordjevic·Bojana Ilic·Marko Djordjevic
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Abstract

We derive a compact HTL-resummed expression for the leading-order jet collisional energy loss in a finite-size, finite-temperature QCD medium. Defining the jet energy inside a cone of radius $R$, we obtain the out-of-cone elastic energy loss with an explicit separation between contributions from the primary jet parton and recoiling medium partons. The result reproduces the known partonic limit as $R\!\to\!0$, vanishes for $R\!\to\!\pi$, and applies to both light- and heavy-flavor jets. Numerically, the elastic component shows a pronounced non-linear $R$ dependence relative to the radiative baseline, and its importance increases with $R$, becoming comparable to or exceeding the radiative contribution for sufficiently large jet radii. The path-length dependence remains close to linear for all $R$, while the medium-response contribution can exceed $10\%$ for realistic jet radii.

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Magdalena Djordjevic, Bojana Ilic, Marko Djordjevic. 2026-01-29. Cone-Dependent Jet Collisional Energy Loss in Finite QCD Medium. https://arxiv.org/abs/2601.21655

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