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arXiv · 2606.16377

Static linear response of hot and dense QCD matter to electromagnetic fields: Leading hard and soft QCD corrections

Osvaldo Ferreira·Eduardo S. Fraga·Tyler Gorda·Risto Paatelainen·Leon Sandbote·Kaapo Seppänen
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Abstract

We compute the static electromagnetic susceptibilities of a hot and dense quark-gluon plasma using perturbative Quantum Chromodynamics (QCD). Our evaluation includes the leading $\mathcal{O}(\alpha_s)$ correction as well as the leading soft, resummed contribution of $\mathcal{O}(\alpha_s^{3/2})$ within electrostatic QCD. By matching to Lattice QCD at vanishing baryon chemical potential through Lattice perturbation theory, we establish a connection between perturbative results and Lattice simulations and assess the size of higher-order corrections. This extends the electromagnetic susceptibilities to finite baryon chemical potential, where Lattice methods are not applicable and establishes first-principle constraints on the quark-gluon plasma's electromagnetic response at temperatures and densities relevant for intermediate-energy heavy-ion collisions.

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Osvaldo Ferreira, Eduardo S. Fraga, Tyler Gorda, Risto Paatelainen, Leon Sandbote, Kaapo Seppänen. 2026-06-15. Static linear response of hot and dense QCD matter to electromagnetic fields: Leading hard and soft QCD corrections. https://arxiv.org/abs/2606.16377

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