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arXiv · 2304.09187

Soft gluon self-energy at finite temperature and density: hard NLO corrections in general covariant gauge

Tyler Gorda·Risto Paatelainen·Saga Säppi·Kaapo Seppänen
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Abstract

We compute the next-to-leading order (NLO) hard correction to the gluon self-energy tensor with arbitrary soft momenta in a hot and/or dense weakly coupled plasma in Quantum Chromodynamics. Our diagrammatic computations of the two-loop and power corrections are performed within the hard-thermal-loop (HTL) framework and in general covariant gauge, using the real-time formalism. We find that after renormalization our individual results are finite and gauge-dependent, and they reproduce previously computed results in Quantum Electrodynamics in the appropriate limit. Combining our results, we also recover a formerly known gauge-independent matching coefficient and associated screening mass in a specific kinematic limit. Our NLO results supersede leading-order HTL results from the 1980s and pave the way to an improved understanding of the bulk properties of deconfined matter, such as the equation of state.

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Tyler Gorda, Risto Paatelainen, Saga Säppi, Kaapo Seppänen. 2023-04-18. Soft gluon self-energy at finite temperature and density: hard NLO corrections in general covariant gauge. https://doi.org/10.1007/jhep08(2023)021

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