Improved opacity expansion at NNLO for medium induced gluon radiation

Abstract

When an energetic parton propagates in a hot and dense QCD medium it loses energy by elastic scatterings or by medium-induced gluon radiation. The gluon radiation spectrum is suppressed at high frequency due to the LPM effect and encompasses two regimes that are known analytically: at high frequencies $\omega >{\omega }_c=\hat{q}{L}^2$, where $\hat{q}$ is the jet quenching transport coefficient and $L$ the length of the medium, the spectrum is dominated by a single hard scattering, whereas the regime $\omega <{\omega }_c$ is dominated by multiple low momentum transfers. In this paper, we extend a recent approach (dubbed the Improved Opacity Expansion (IOE)), which allows an analytic (and systematic) treatment beyond the multiple soft scattering approximation, matching this result with the single hard emission spectrum. We calculate in particular the NNLO correction analytically and numerically and show that it is strongly suppressed compared to the NLO indicating a fast convergence of the IOE scheme and thus, we conclude that it is sufficient to truncate the series at NLO. We also propose a prescription to compare the GW and the HTL potentials and relate their parameters for future phenomenological works.

27 pages, 5 figures, submitted to JHEP

References in corpus (4)

• Jet physics in heavy-ion collisions
• Finite-size effects on the radiative energy loss of a fast parton in hot and dense strongly interacting matter
• Simple Formula for High-Energy Gluon Bremsstrahlung in a Finite, Expanding Medium
• Medium-induced gluon radiation and colour decoherence beyond the soft approximation

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