Physics – Nuclear Physics – Nuclear Theory
Scientific paper
2010-06-18
Prog.Theor.Phys.Suppl.186:384-389,2010
Physics
Nuclear Physics
Nuclear Theory
6 pages, 5 figures, invited seminar in New Frontiers in QCD 2010 -Exotic Hadron Systems and Dense Matter- (NFQCD2010), Kyoto,
Scientific paper
10.1143/PTPS.186.384
The properties of strange mesons ($K$, $\bar K$ and $\bar K^*$) in dense matter are studied using a unitary approach in coupled channels for meson-baryon scattering. The kaon-nucleon interaction incorporates $s$- and $p$-wave contributions within a chiral model whereas the interaction of $\bar K^*$ with nucleons is obtained in the framework of the local hidden gauge formalism. The in-medium solution for the scattering amplitude accounts for Pauli blocking effects, mean-field binding on baryons, and meson self-energies. We obtain the $K$, $\bar K$ and $\bar K^*$ (off-shell) spectral functions in the nuclear medium and study their behaviour at finite density, temperature and momentum. We also analyze the energy weighted sum rules of the kaon propagator as a quality test of model calculations. We finally estimate the transparency ratio of the $\gamma A \to K^+ K^{*-} A^\prime$ reaction, which we propose as a feasible scenario at present facilities to detect in-medium modifications of the $\bar K^*$ meson.
Asensio Ramos Andrés
Cabrera Daniel
Molina Raquel
Oset Eulogio
Tolos Laura
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