Coupled channels approach to eta N and eta ' N interactions
Result description
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.
Keywords
Chiral dynamicsMeson-nucleon interactionEta-eta' mixingBaryon resonances
The result's identifiers
Result code in IS VaVaI
Result on the web
DOI - Digital Object Identifier
Alternative languages
Result language
angličtina
Original language name
Coupled channels approach to eta N and eta ' N interactions
Original language description
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.
Czech name
—
Czech description
—
Classification
Type
Jimp - Article in a specialist periodical, which is included in the Web of Science database
CEP classification
—
OECD FORD branch
10301 - Atomic, molecular and chemical physics (physics of atoms and molecules including collision, interaction with radiation, magnetic resonances, Mössbauer effect)
Result continuities
Project
GA19-19640S: Study of Hadron Interactions, Production and Bound States
Continuities
I - Institucionalni podpora na dlouhodoby koncepcni rozvoj vyzkumne organizace
Others
Publication year
2019
Confidentiality
S - Úplné a pravdivé údaje o projektu nepodléhají ochraně podle zvláštních právních předpisů
Data specific for result type
Name of the periodical
Nuclear Physics. A
ISSN
0375-9474
e-ISSN
—
Volume of the periodical
992
Issue of the periodical within the volume
12
Country of publishing house
NL - THE KINGDOM OF THE NETHERLANDS
Number of pages
33
Pages from-to
121630
UT code for WoS article
000497602500018
EID of the result in the Scopus database
2-s2.0-85072705673
Basic information
Result type
Jimp - Article in a specialist periodical, which is included in the Web of Science database
OECD FORD
Atomic, molecular and chemical physics (physics of atoms and molecules including collision, interaction with radiation, magnetic resonances, Mössbauer effect)
Year of implementation
2019