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Diquark correlators and phase structure in the quark-meson-diquark model beyond mean field

Ugo Mire1,* and Bernd-Jochen Schaefer1,2,†

  • *Contact author: ugo.louis.tryphon.mire@physik.uni-giessen.de
  • †Contact author: bernd-jochen.schaefer@uni-giessen.de
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Phys. Rev. D 114, 054036 – Published 17 September, 2026

DOI: https://doi.org/10.1103/vfsb-3xyg

Abstract

A comprehensive study of the phase structure of the two-flavor quark-meson-diquark model is presented within the nonperturbative functional renormalization group framework. The influence of mesonic fluctuations beyond the mean-field approximation is investigated and two-point functions of the diquark fields are computed at finite real-time frequencies. Renormalization group consistency of the effective potential is ensured in order to avoid cutoff artifacts. Substantial modifications of the phase structure are found once mesonic fluctuations are included, and for sufficiently strong diquark couplings the dynamics become dominated by diquark condensation. These effects are elucidated through an analysis of the diquark pole mass and the Silver-Blaze property.

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Phys. Rev. D 114, 054036– Published 17 September, 2026
  • Received 20 May 2026
  • Accepted 11 August 2026
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