Article ID | Journal | Published Year | Pages | File Type |
---|---|---|---|---|
10721892 | Physics Letters B | 2011 | 9 Pages |
Abstract
We study the ηâ²N interaction within a chiral unitary approach which includes ÏN, ηN and related pseudoscalar meson-baryon coupled channels. Since the SU(3) singlet does not contribute to the standard interaction and the ηⲠis mostly a singlet, the resulting scattering amplitude is very small and inconsistent with the experimental 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 ηâ²N 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 ηâ²N scattering length, we obtain predictions for the elastic ηâ²Nâηâ²N and inelastic ηâ²NâηN, ÏN, KÎ, KΣ cross sections at low ηⲠenergies, and discuss their significance.
Related Topics
Physical Sciences and Engineering
Physics and Astronomy
Nuclear and High Energy Physics
Authors
E. Oset, A. Ramos,