Abstract
Octet-decuplet mixing offers a possible explanation for experimental disagreements of quark model and SU (6) predictions for strange baryons while not affecting these predictions for nucleons. The second order correction to the Gell-Mann-Okubo mass formula is calculated using as input the observed mass splitting in the baryon octet and the observed excitation energy of the Δ (1900) 1 2 + . Good agreement with experimental baryon masses is obtained.
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