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

摘要

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.