BARYON MASSES IN A CHIRAL EXPANSION WITH MESON-BARYON FORM-FACTORS

The chiral expansion of the one-loop corrections to baryon masses is e xamined in a generic meson-cloud model with meson-baryon form factors. For pion loops, the expansion is rapidly convergent and at fourth ord er in m(pi) accurately reproduces the full integral. In contrast, the expansion is found to converge very slowly for kaon loops. Despite the importance of high-order terms, relations like that of Gell-Mann and Okubo are well satisfied by the baryon masses calculated with the full integral. The pion cloud makes a significant contribution; to the pi N sigma commutator, while the kaon cloud gives a very small strangenes s content in the nucleon.