2008/07/31 by M. Harada, Masayasu Harada, Chihiro Sasaki +2
Physics and Astronomy · #High-Energy Particle Collisions Research #Particle physics theoretical and experimental studies #Quantum Chromodynamics and Particle Interactions #hep-ph #nucl-th
paper · pdf · doi:10.1103/physrevd.78.114003
published as Phys.Rev.D78:114003,2008 · v2:11 pages, 6 figures, reorganized and expanded the text, new plots and references added, main result and conclusions unchanged
arxiv created 2008/10/06 · openalex publication_date 2008/12/03 · arxiv updated 2009/12/01 · openalex created_date 2025/10/10 · openalex updated_date 2026/07/28
We study the vector--axial-vector mixing in a hot medium and its evolution toward the chiral phase transition using different symmetry restoration scenarios based on the generalized hidden local symmetry framework. We show that the presence of the a1 meson reduces the vector spectral function around the \ensuremathρ meson mass and enhances it around the a1 meson mass. The coupling strength of a1 to \ensuremathρ and \ensuremathπ vanishes at the critical temperature due to the degenerate \ensuremathρ-a1 masses. This feature holds rigorously in the chiral limit and still stays intact to good approximation for the physical pion mass.