Interactions of omega mesons in nuclear matter and with nuclei

TL;DR

This paper investigates omega meson interactions within nuclear matter and nuclei using a microscopic approach, deriving self-energies and applying them to experimental data, revealing bound states with finite lifetimes.

Contribution

It introduces a comprehensive microscopic framework for omega meson interactions in nuclear matter, including the first spectrum of omega-nucleus bound states.

Findings

Data on in-medium omega width are well explained by the model.

A spectrum of omega-nucleus bound states is predicted.

Self-energies include effects of S-wave and P-wave resonances.

Abstract

In-medium interactions of omega-mesons in infinite nuclear matter and finite nuclei are investigated in a microscopic approach with nucleon-nucleon and nucleon-resonance particle-hole polarization modes. The nuclear polarization tensor formalism is used. Covariant mean-field self-energies are taken into account. Longitudinal and transversal self-energies are derived. The theoretical results are applied to finite nuclei in local density approximation. Applications to recent data on the in-medium width of omega mesons in 93-Nb are presented. The data are well described by self-energies containing S-wave and P-wave resonances. Low-energy parameters are determined. For the first time a spectrum of omega-nucleus bound states is obtained, albeit with reduced lifetimes.