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We study the isospin symmetry breaking and mass splittings of the eightlowest-lying baryons. We consider three kinds of baryon mass terms, includingthe bare mass term, the electromagnetic terms and the spontaneous chiralsymmetry breaking terms. We include the mixing term between flavor-octet andflavor-decuplet baryons. This assumes that the lowest-lying Sigma and Xibaryons contain a few decuplet components and so are not purely flavor-octet.We achieve a good fitting that the difference between every fitted mass and itsexperimental value is less than 0.2 MeV.

Isospin Symmetry Breaking and Octet Baryon Masses due to Their Mixing with Decuplet Baryons