Light flavor baryon spectrum with higher order hyperfine interactions
arXiv:0911.1156 · doi:10.1016/j.nuclphysa.2009.09.005
Abstract
We study the spectrum of light flavor baryons in a quark-model framework by taking into account the order $\mathrm{O}(α_s^2)$ hyperfine interactions due to two-gluon exchange between quarks. The calculated spectrum agree better with the experimental data than the results from hyperfine interactions with only one-gluon exchange. It is also shown that two-gluon exchange hyperfine interactions bring a significantly improved correction to the Gell-Mann--Okubo mass formula. Two-gluon exchange corrections on baryon excitations (including negative parity baryons) are also briefly discussed.
31 latex pages, final version in journal publication