The In-Medium K^^-N Interaction within a Chiral Unitary Approach(Hadronic matter and equation of state, Chiral dynamics in nuclear medium, New Frontiers in QCD-Exotic Hadrons and Hadronic Matter-)

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The s- and p-wave contributions to the K^^-N interaction in dense nuclear matter are obtained using a chiral unitary approach. We perform a self-consistent calculation of the K^^- self-energy including Pauli blocking effects, meson self-energies modified by short-range correlations and baryon binding potentials. We find that the on-shell factorization cannot be applied to evaluate the in-medium corrections to p-wave amplitudes. Furthermore, the Λ and Σ develop a mass shift of -30MeV at saturation density while the Σ^* width increases to 80MeV. We conclude that no deep and narrow K^^- bound states could be observed.
2007-11-09