| Issue |
EPJ Web of Conferences
Volume 3, 2010
19th International IUPAP Conference on Few-Body Problems in Physics
|
|
|---|---|---|
| Article Number | 03008 | |
| Number of page(s) | 4 | |
| Section | Few-Hadron Systems | |
| DOI | https://doi.org/10.1051/epjconf/20100303008 | |
| Published online | 12 April 2010 | |
https://doi.org/10.1051/epjconf/20100303008
Quark-Model Predictions for Axial Charges of Nucleon and N* Resonances
Theoretical Physics, Institute of Physics, University of Graz,
Universitätsplatz 5, A-8010 Graz, Austria
a e-mail: ki.choi@uni-graz.at
We have investigated the axial charges of the nucleon and N* resonances in a relativistic framework. Besides the axial charge of the nucleon, first predictions are reported for the axial charges of all well-established N* resonances below ∼1.9 GeV as produced by the relativistic constituent quark models relying on Goldstoneboson-exchange and one-gluon-exchange hyperfine interactions. The results for the axial charge of the nucleon are found close to experiment but with somewhat smaller values, similar to modern findings from quantum chromodynamics on the lattice. The predictions of the axial charges of the negative-parity N* (1535) and N*(1650) resonances also agree with what has most recently become available from lattice calculations. We discuss the roles of the axial charges of the N* resonances for the phenomenon of chiral-symmetry restoration possibly occurring in the higher hadron spectra.
© Owned by the authors, published by EDP Sciences, 2010
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