Chiral dynamics of the S11(1535) and S11(1650) resonances revisited

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 reso...

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Veröffentlicht in:Physics letters. B 2011-03, Vol.697 (3), p.254-259
Hauptverfasser: Bruns, Peter C., Mai, Maxim, Meißner, Ulf-G.
Format: Artikel
Sprache:eng
Schlagworte:
Baryon resonances
Chiral Lagrangians
Exact sciences and technology
Nuclear physics
Physics
Pion–baryon interactions
The physics of elementary particles and fields
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Zusammenfassung: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.
ISSN:0370-2693
1873-2445
DOI:10.1016/j.physletb.2011.02.008