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Chiral unitary approach to eta'N scattering at low energies
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We study the eta'N interaction within a chiral unitary approach which includes piN , etaN and related pseudoscalar meson-baryon coupled channels. Since the SU(3) singlet does not contribute to the standard interaction and the eta' is mostly a singlet, the resulting scattering amplitude is very small and inconsistent with experimental estimations of the eta' N scattering length. The additional consideration of vector meson-baryon states into the coupled channel scheme, via normal and anomalous couplings of pseudoscalar to vector mesons, enhances substantially the eta' N amplitude. We also exploit the freedom of adding to the Lagrangian a new term, allowed by the symmetries of QCD, which couples baryons to the singlet meson of SU(3). Adjusting the unknown strength to the eta' N scattering length, we obtain predictions for the elastic eta'N -> etaN and inelastic eta' N -> etaN , piN , KLambda, KEpsilon cross sections at low eta' energies, and discuss their significance.
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OSET BAGUENA, Eulogio, RAMOS GÓMEZ, Àngels. Chiral unitary approach to eta'N scattering at low energies. _Physics Letters B_. 2011. Vol. 704, núm. 4, pàgs. 334-342. [consulta: 20 de gener de 2026]. ISSN: 0370-2693. [Disponible a: https://hdl.handle.net/2445/21043]