Baryon masses in a chiral expansion with meson-baryon form factors

Details Baryon masses in a chiral expansion with meson-baryon form factors Baryon masses in a chiral expansion with meson-baryon form factors

1996-02-14

arxiv.org/abs/hep-ph/9602312v1

J.Phys.G23:29-40,1997

Physics

High Energy Physics

High Energy Physics - Phenomenology

20 pages (RevTeX), 2 figures (attached)

Scientific paper

10.1088/0954-3899/23/1/003

The chiral expansion of the one-loop corrections to baryon masses is examined in a generic meson-cloud model with meson-baryon form factors. For pion loops, the expansion is rapidly convergent and at fourth order in $m_\pi$ accurately reproduces the full integral. In contrast, the expansion is found to converge very slowly for kaon loops, raising questions about the usefulness of chiral expansions for kaon-baryon physics. 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 cloud makes a significant contribution to the $\pi N$ sigma commutator, while kaon cloud gives a very small strangeness content in the nucleon.

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