Eta-nuclear interaction: optical vs. coupled channels

@inproceedings{Niskanen2015EtanuclearIO,
  title={Eta-nuclear interaction: optical vs. coupled channels},
  author={Jouni A. Niskanen},
  year={2015}
}
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 ηN scattering giving the same elementary scattering length, a simple optical potential and an explicit coupling to the pionic channel, it is seen that the… 
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