2026/07/24 by K. Azizi, N. Er, J. Y. Süngü
#hep-ph #hep-ex #hep-lat
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 OPE incorporates the full temperature- and density-dependent contributions from the quark, gluon, and mixed condensates. Computing the strange (Bs*0, Bs*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.