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arXiv · 2605.27347

Polarization dependence of the $\phi$ meson from finite-temperature QCD sum rules

Hidefumi Matsuda·Philipp Gubler·Koichi Hattori
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Abstract

We study the $\phi$ meson at finite temperature and finite momentum using QCD sum rules. The presence of medium breaks the Lorentz invariance, and induces distinct in-medium modifications of the transverse and longitudinal modes at finite momentum. We find that, with increasing momentum, the masses of both modes increase and a clear transverse--longitudinal splitting develops. The splitting is found to grow with temperature and to be mainly generated by the dimension-four spin-dependent thermal condensates.

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Hidefumi Matsuda, Philipp Gubler, Koichi Hattori. 2026-05-26. Polarization dependence of the $\phi$ meson from finite-temperature QCD sum rules. https://arxiv.org/abs/2605.27347

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