Light flavor baryon spectrum with higher order hyperfine interactions

Details Light flavor baryon spectrum with higher order hyperfine interactions Light flavor baryon spectrum with higher order hyperfine interactions

2009-11-06

arxiv.org/abs/0911.1156v1

Nucl.Phys.A831:1-21,2009

Physics

High Energy Physics

High Energy Physics - Phenomenology

31 latex pages, final version in journal publication

Scientific paper

10.1016/j.nuclphysa.2009.09.005

We study the spectrum of light flavor baryons in a quark-model framework by taking into account the order $\mathrm{O}(\alpha_s^2)$ 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.

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