Phys. Rev. D 78, 114003 (2008) [10 pages]Vector–axial-vector mixing from a chiral effective field theory at finite temperatureReceived 9 July 2008; revised 6 October 2008; published 3 December 2008 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 ρ meson mass and enhances it around the a1 meson mass. The coupling strength of a1 to ρ and π vanishes at the critical temperature due to the degenerate ρ-a1 masses. This feature holds rigorously in the chiral limit and still stays intact to good approximation for the physical pion mass. © 2008 The American Physical Society URL:
http://link.aps.org/doi/10.1103/PhysRevD.78.114003
DOI:
10.1103/PhysRevD.78.114003
PACS:
12.38.Aw, 11.30.Rd, 12.39.Fe
|
|
About | Terms and Conditions | Subscriptions | Search | Help
Use of the American Physical Society websites and journals implies that the user has read and agrees to our Terms and Conditions and any applicable Subscription Agreement. Physical Review®, Physical Review Letters®, Reviews of Modern Physics®, and Physical Review Special Topics® are trademarks of the American Physical Society.