PoS - Proceedings of Science
Volume 387 - 10th International Conference on Hard and Electromagnetic Probes of High-Energy Nuclear Collisions (HardProbes2020) - New Theoretical Developments
The problem of overlapping formation times: A (nearly) complete result for QCD
S. Iqbal*, P. Arnold and T. Gorda
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Published on: September 01, 2021
Abstract
The splitting processes of bremsstrahlung and pair-production in a medium are coherent over large distances in the high energy limit leading to a suppression known as the Landau-Pomeranchuk-Migdal (LPM) effect. Avoiding soft-emission approximations and working in the large-Nc limit, we consider corrections to the LPM effect from cases where the coherence lengths of two consecutive splittings overlap. In this work, we present (i) complete results for the case of two overlapping gluon splittings (e.g. $g\rightarrow g g\rightarrow g g g$ and virtual corrections to single splitting $g\rightarrow g g^{*}\rightarrow g g g^{*}\rightarrow g g$) and (ii) confirm that earlier leading-log results for these effects are reproduced by our more-complete results in the appropriate soft limit. We also discuss how to combine the effects of overlapping real double splitting with the corresponding virtual corrections to single splitting in order to calculate IR-safe quantities such as in-medium energy loss.
DOI: https://doi.org/10.22323/1.387.0181
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