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Unified analysis of screening masses for vector and axial-vector mesons and their diquark partners in the contact interaction model

L. X. Gutiérrez-Guerrero1,*, M. A. Ramírez-Garrido2,†, M. A. Pérez de León2,3,‡, and R. J. Hernández-Pinto2,§

  • *Contact author: lxgutierrez@secihti.mx
  • †Contact author: miguelramirez.fcfm@ms.uas.edu.mx
  • ‡Contact author: marioaldair.perez@uas.edu.mx
  • §Contact author: roger@uas.edu.mx
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Phys. Rev. D 113, 014035 – Published 28 January, 2026

DOI: https://doi.org/10.1103/7y5n-mtwh

Abstract

We present a comprehensive study of the screening masses of vector and axial-vector mesons and their corresponding diquark partners within a symmetry-preserving vector-vector contact interaction approach. Our analysis includes mesons and diquarks composed of both light and heavy quarks, providing a unified description of their thermal behavior. The longitudinal and transverse modes of the screening masses are analyzed, and the results are systematically compared with other theoretical approaches. At T=0  MeV, our predictions agree with available experimental data, and a comparison with the expected free theory limit at high temperatures is also presented. Notably, the parity partners of the lightest mesons and diquarks converge at high temperatures, signaling chiral symmetry restoration within this framework. These results provide a consistent and detailed picture of meson and diquark properties at finite temperature and lay the groundwork for extending the capabilities of the model to baryon screening masses in the quark-diquark picture.

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Phys. Rev. D 113, 014035– Published 28 January, 2026
  • Received 10 September 2025
  • Accepted 7 January 2026
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Published by the American Physical Society under the terms of the Creative Commons Attribution 4.0 International license. Further distribution of this work must maintain attribution to the author(s) and the published article’s title, journal citation, and DOI. Funded by SCOAP3.

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