English (United Kingdom)

https://curated-unify.zendy.io/wp-json/zendy-region/v1/featured_content/oa?rat=en

https://curated-unify.zendy.io/wp-json/zendy-region/v1/highlighted_journal/

Zendy Open

Presents the pdf analysis as premium feature

PDF Analysis

Insights

Presents the summarisation as premium feature

Summarisation

Presents the keyphrase highlighting as premium feature

Keyphrase Highlighting

Presents the zaia usage as premium feature

ZAIA

Zendy Tools

Zendy Plus

Presents the access of premium content as premium feature

Premium Content

The width of the $\omega$ meson in cold nuclear matter is computed in ahadronic many-body approach, focusing on a detailed treatment of the mediummodifications of intermediate $\pi\rho$ states. The $\pi$ and $\rho$propagators are dressed by their selfenergies in nuclear matter taken frompreviously 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 full3-momentum dependence and vertex corrections, as well as direct resonance-holeexcitations; both contributions were quantitatively fit to totalphoto-absorption spectra and $\pi N\to\rho N$ scattering. Our calculationsaccount for in-medium decays of type $\omega N\to \pi N^{(*)}, \pi\piN(\Delta)$, and 2-body absorptions $\omega NN\to NN^{(*)},\pi NN$. This causesdeviations 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 matterdensity, with a moderate 3-momentum dependence. This largely resolves thediscrepancy of linear $T$-$\varrho$ approximations with the values deduced fromnuclear photoproduction measurements.

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