A three-channel, multi-resonance, unitary model developed in 1995 is used to determine the π N → η N and η N → η N amplitudes by re-analyzing the available data on π N elastic scattering and the weighted data for the π N → η N total and differential cross sections. The input π N elastic scattering amplitude in the S 11 channel has been improved, following suggestions of G. Höhler. Our new result of η N scattering length, a η N = (0.717±0.030)+ i · (0.263±0.025) fm, suggests that the η d system is unbound or loosely bound.
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Batinić et al. (1998) studied this question.
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