Bruns, Peter and Mai, Maxim and Meißner, Ulf-G.
Chiral dynamics of the S11(1535) and S11(1650) resonances revisited.
We analyze s-wave pion-nucleon scattering in a unitarized chiral effective Lagrangian including all dimension two contact terms. We find that both the S11(1535) and the S11(1650) are dynamically generated, but the S31(1620) is not. We further discuss the structure of these dynamically generated resonances.
© 2012 American Institute of ...
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