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arXiv · 0902.3608

A novel spectral broadening from vector--axial-vector mixing in dense matter

M. Harada·C. Sasaki
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Abstract

The presence of baryonic matter leads to the mixing between transverse $ρ$ and $a_1$ mesons through a set of $ωρa_1$-type interactions, which results in the modification to the dispersion relation. We show 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. We also discuss its relevance to dilepton measurements.

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M. Harada, C. Sasaki. 2009-02-20. A novel spectral broadening from vector--axial-vector mixing in dense matter. https://doi.org/10.1103/physrevc.80.054912

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