Mesons in Nuclei: η and ω Mesons

Photoproduction of η-mesons from light nuclei

In a series of experiments coherent and quasifree η-photoproduction from light nuclei (He, He, H) was investigated with the TAPS-detector at the Mainz MAMI-accelerator. The experiments were motivated by two different subjects: the determination of the isospin structure of the electromagnetic excitation of the S11(1535) resonance and the study of the η-nucleon and η-nucleus interaction at small ...

Absorption of the ω and ϕ mesons in nuclei.

Because of their long lifetimes, the ω and ϕ mesons are the ideal candidates for the study of possible modifications of the in-medium meson-nucleon interaction through their absorption inside the nucleus. During the E01-112 experiment at the Thomas Jefferson National Accelerator Facility, the mesons were photoproduced from 2H, C, Ti, Fe, and Pb targets. This Letter reports the first measurement...

The η and η ′ mesons in QCD

Photoproduction of Quasi-bound Ω Mesons in Nuclei *

We propose the (γ, p) reaction as a means of producing possible quasi-bound states of ω mesons in nuclei. We use an effective Lagrangian, based on chiral SU (3) symmetry and vector meson dominance, in order to construct the ω-nuclear potential. The contribution of bound ω states is observable in the missing energy spectra of protons emitted in forward direction for several nuclei.

Ω Mesons in Medium -revisited

Recent experimental observation by the CBELSA/TAPS collaboration indicates a downward mass shift of the ω meson when put into a nuclear medium. Therefore it is worthwhile to take a look at theoretical approaches that can describe this mass shift. One such hadronic model was introduced by Klingl et al. [1]. We will demonstrate that the heavy baryon limit approximation used there has no justifica...