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arXiv · 1502.03278

Eta-nuclear interaction: optical vs. coupled channels

J. A. Niskanen
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Abstract

The existence of etamesic nuclei has been speculated for a long time without firm experimental evidence. Much of the effort has taken place in final state interactions on production. One crucial factor in seeing a quasibound state is its width, which should be related to the imaginary part of the scattering length. Comparing two models for eta-N scattering giving the same elementary scattering length, a simple optical potential and an explicit coupling to the pionic channel, it is seen that the latter yields a much smaller imaginary part for eta-nucleus scattering. This decrease of absorption may also mean a possibility for narrow eta-nuclear states.

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J. A. Niskanen. 2015-11-26. Eta-nuclear interaction: optical vs. coupled channels. https://doi.org/10.1103/physrevc.92.055205

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