Strange Meson Production at High Density and Temperature(Hadrons in Nuclei,New Frontiers in QCD 2010-Exotic Hadron Systems and Dense Matter-)

概要

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The properties of strange mesons (K, K^^- and 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 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, K^^- and 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 γA→K^+K^<*->A' reaction, which we propose as a feasible scenario at present facilities to detect in-medium modifications of the K^^-^* meson.
2010-12-17