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    Kˉ∗\bar K^* meson in dense matter

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    We study the properties of Kˉ∗\bar K^* mesons in nuclear matter using a unitary approach in coupled channels within the framework of the local hidden gauge formalism and incorporating the Kˉπ\bar K \pi decay channel in matter. The in-medium Kˉ∗N\bar K^* N interaction accounts for Pauli blocking effects and incorporates the Kˉ∗\bar K^* self-energy in a self-consistent manner. We also obtain the Kˉ∗\bar K^* (off-shell) spectral function and analyze its behaviour at finite density and momentum. At normal nuclear matter density, the Kˉ∗\bar K^* meson feels a moderately attractive potential while the Kˉ∗\bar K^* width becomes five times larger than in free space. We estimate the transparency ratio of the γA→K+K∗−A′\gamma A \to K^+ K^{* -} A^\prime reaction, which we propose as a feasible scenario at present facilities to detect the changes of the properties of the Kˉ∗\bar K^* meson in the nuclear medium.Comment: 26 pages, 9 figures, one new section added, version published in Phys. ReV. C, http://link.aps.org/doi/10.1103/PhysRevC.82.04521
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