Coupled channels approach to eta N and eta ' N interactions

0517483 - ÚJF 2020 RIV NL eng J - Článek v odborném periodiku
Bruns, Peter Christian - Cieplý, Aleš
Coupled channels approach to eta N and eta ' N interactions.
Nuclear Physics. A. Roč. 992, č. 12 (2019), č. článku 121630. ISSN 0375-9474. E-ISSN 1873-1554
Grant CEP: GA ČR GA19-19640S
Institucionální podpora: RVO:61389005
Klíčová slova: Chiral dynamics * Meson-nucleon interaction * Eta-eta' mixing * Baryon resonances
Obor OECD: Atomic, molecular and chemical physics (physics of atoms and molecules including collision, interaction with radiation, magnetic resonances, Mössbauer effect)
Impakt faktor: 1.695, rok: 2019
Způsob publikování: Omezený přístup
https://doi.org/10.1016/j.nuclphysa.2019.121630

We present a coupled channels separable potential approach to eta N and eta'N interactions using a chiral symmetric interaction kernel. The s-wave pi N amplitudes and pi(-) p induced total cross sections are reproduced satisfactorily in a broad interval of energies despite limiting the channel space to two-body interactions of pseudoscalar mesons with the baryon ground-state octet. It is demonstrated that an explicit inclusion of the eta 0 meson singlet field leads to a more attractive eta N interaction, with the real part of the scattering length exceeding 1 fm. The eta'N diagonal coupling appears sufficient to generate an eta'N bound state but the inter-channel dynamics moves the respective pole far from the physical region making the eta'N interaction repulsive at energies around the channel threshold. The N* (1535) and N* (1650) resonances are generated dynamically and the origin and properties of the S-matrix poles assigned to them are studied in detail. We also hint at a chance that the N* (1895) state might also be formed provided a suitably varied model setting is found.
Trvalý link: http://hdl.handle.net/11104/0302795