P-Wave Polarization of the $\rho$-Meson and the Dilepton Spectrum in Dense Matter

Abstract

We study the $p$-wave polarization operator of the $\rho$-meson due to $\rho N$ interactions via the $N^{\ast }$ (1720) and $\Delta (1905)$ resonances and compute the corresponding production rate for $e^{+}{e}^{-}$-pairs at finite temperature and baryon density. At high baryon density we find a significant shift of the spectrum to lower invariant masses.

Comments: 22 pages, 8 Postscript figures, uses article.sty, epsf.sty, epsfig.sty