The $\pi \rho$ Cloud Contribution to the $\omega$ Width in Nuclear Matter

Abstract

The width of the $\omega$ meson in cold nuclear matter is computed in a hadronic many-body approach, focusing on a detailed treatment of the medium modifications of intermediate $\pi \rho$ states. The $\pi$ and $\rho$ propagators are dressed by their selfenergies in nuclear matter taken from previously constrained many-body calculations. The pion selfenergy includes $Nh$ and $\Delta h$ excitations with short-range correlations, while the $\rho$ selfenergy incorporates the same dressing of its $2\pi$ cloud with a full 3-momentum dependence and vertex corrections, as well as direct resonance-hole excitations; both contributions were quantitatively fit to total photo-absorption spectra and $\pi N\to \rho N$ scattering. Our calculations account for in-medium decays of type $\omega N\to \pi N^{(\ast )},\pi \pi N(\Delta )$, and 2-body absorptions $\omega NN\to N{N}^{(\ast )},\pi NN$. This causes deviations of the in-medium $\omega$ width from a linear behavior in density, with important contributions from spacelike $\rho$ propagators. The $\omega$ width from the $\rho \pi$ cloud may reach up to 200 MeV at normal nuclear matter density, with a moderate 3-momentum dependence. This largely resolves the discrepancy of linear $T$-$\varrho$ approximations with the values deduced from nuclear photoproduction measurements.

Comments: 7 pages, 4 eps figures; v2: includes 3-mom dependence of width and additional discussion