Novel spectral broadening from vector--axial-vector mixing in dense matter

Abstract

In this write-up we summarize main result of our recent analysis on the mixing between transverse $ρ$ and $a_1$ mesons through a set of $ωρa_1$-type interactions in dense baryonic matter. In the analysis, we showed that a clear enhancement of the vector spectral function appears below $\sqrt{s}=m_ρ$ for small three-momenta of the $ρ$ meson, and thus the vector spectrum exhibits broadening.

Talk given by M. Harada at YITP workshop on "Thermal Quantum Field Theory and Their Applications 2009" (September, 3 - 5, 2009, Yukawa Institute, Kyoto, Japan)