Nuclear medium effects on the ${\bar{K}}^{\ast }$ meson

Abstract

The ${\bar{K}}^{\ast }$ meson in dense matter is analyzed by means of a unitary approach in coupled channels based on the local hidden gauge formalism. The ${\bar{K}}^{\ast }$ self-energy and the corresponding ${\bar{K}}^{\ast }$ spectral function in the nuclear medium are obtained. We observe that the ${\bar{K}}^{\ast }$ develops a width in matter up to five times bigger than in free space. We also estimate the transparency ratio of the $\gamma A\to K^{+}{K}^{\ast -}{A}^{\prime }$ reaction. This ratio is an excellent tool to detect experimentally modifications of the ${\bar{K}}^{\ast }$ meson in dense matter.

11 pages, 5 figures, contribution based on the invited talk at ECT* Workshop "Strange Hadronic Matter", September 26-30, 2011

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