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arXiv · 2501.15115

Are Parton Showers in a Quark-Gluon Plasma Strongly Coupled? A Theorist's Test

Peter Arnold·Omar Elgedawy·Shahin Iqbal
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Abstract

We study whether in-medium showers of high-energy quarks and gluons can be treated as a sequence of individual splitting processes or whether there is significant quantum overlap between where one splitting ends and the next begins. Accounting for the Landau-Pomeranchuk-Migdal (LPM) effect, we calculate such overlap effects to leading order in high-energy $\alpha_s(\mu)$ for the simplest theoretical situation. We investigate a measure of overlap effects that is independent of physics that can be absorbed into an effective value $\hat{q}_{eff}$ of the jet-quenching parameter $\hat{q}$.

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Peter Arnold, Omar Elgedawy, Shahin Iqbal. 2025-01-25. Are Parton Showers in a Quark-Gluon Plasma Strongly Coupled? A Theorist's Test. https://doi.org/10.22323/1.476.0582

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