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arXiv · 0807.1417

Vector-axialvector mixing from a chiral effective field theory at finite temperature

M. Harada·C. Sasaki·W. Weise
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Abstract

We study the vector-axialvector 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 $a_1$ meson reduces the vector spectral function around $ρ$ meson mass and enhances it around $a_1$ meson mass. The coupling strength of $a_1$ to $ρ$ and $π$ vanishes at the critical temperature due to the degenerate $ρ$-$a_1$ masses. This feature holds rigorously in the chiral limit and still stays intact to good approximation for the physical pion mass.

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M. Harada, C. Sasaki, W. Weise. 2008-10-06. Vector-axialvector mixing from a chiral effective field theory at finite temperature. https://doi.org/10.1103/physrevd.78.114003

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