Critical Analysis of Baryon Masses and Sigma-Terms in Heavy Baryon Chiral Perturbation Theory

Abstract

We present an analysis of the octet baryon masses and the $\pi N$ and $KN$ $\sigma$--terms in the framework of heavy baryon chiral perturbation theory. At next-to-leading order, $\mathcal{O}(q^3)$, knowledge of the baryon masses and ${\sigma }_{\pi N}(0)$ allows to determine the three corresponding finite low--energy constants and to predict the the two $KN$ $\sigma$--terms ${\sigma }_{KN}^{(1,2)}(0)$. We also include the spin-3/2 decuplet in the effective theory. The presence of the non--vanishing energy scale due to the octet--decuplet splitting shifts the average octet baryon mass by an infinite amount and leads to infinite renormalizations of the low--energy constants. The first observable effect of the decuplet intermediate states to the baryon masses starts out at order $q^4$. We argue that it is not sufficient to retain only these but no other higher order terms to achieve a consistent description of the three--flavor scalar sector of baryon CHPT. In addition, we critically discuss an SU(2) result which allows to explain the large shift of ${\sigma }_{\pi N}(2M_{\pi }^2)-{\sigma }_{\pi N}(0)$ via intermediate $\Delta (1232)$ states.

18 pp, TeX, BUTP-93/05 and CRN-93-06

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• Electromagnetic Polarisability of the Nucleon in Chiral Perturbation Theory

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