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Hot and dense medium effects on the Bs* and B* multiplets

K. Azizi1,2,*, N. Er3, and J. Y. Süngü4

  • *Contact author: kazem.azizi@ut.ac.ir
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Phys. Rev. D 114, 074022 – Published 9 October, 2026

DOI: https://doi.org/10.1103/by1b-zx8n

Abstract

We present an extensive analysis of the in-medium masses and decay constants of the Bs*(5415) and B*(5325) multiplets, including both particles and antiparticles, using QCD sum rules at finite temperature and density. The operator product expansion incorporates the full temperature- and density-dependent contributions from the quark, gluon, and mixed condensates. Computing the strange (Bs*0, B¯s*0), charged (B*±), and neutral (B*0, B¯*0) doublet properties allows us to study the effects of flavor symmetry breaking, strangeness, and heavy-quark decoupling on the beauty vector mesons in the medium. Our results indicate that the mass is remarkably resistant to the medium across the entire multiplet: no state loses more than ∼13% of its vacuum value, even at T=Tc and n=5n0, the extreme conditions explored here. The decay constant is far more sensitive, losing up to ∼78% at the same point. Baryon density clearly dominates the medium response, while temperature plays a secondary role until the system approaches the deconfinement crossover. At zero density, every state loses almost the same fraction of its mass and decay constant: mass shifts lie between −(0.5–1.1)% and decay-constant shifts between −(3.9–5.3)%, regardless of charge or flavor, so temperature alone does not distinguish a particle from its antiparticle. At finite baryon density, a clear particle-antiparticle asymmetry emerges: at T=0 and n=5n0, the B¯*0 mass decreases by 12.9%, whereas the B*0 mass shifts by only 6.1%, a gap of nearly seven percentage points driven entirely by the vector self-energy. This provides a theoretical basis for the future heavy-ion collision program at RHIC, LHC, FAIR, and NICA.

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Phys. Rev. D 114, 074022– Published 9 October, 2026
  • Received 24 July 2026
  • Accepted 24 September 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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