Properties of hyperons in chiral perturbation theory

Abstract

The development of chiral perturbation theory in hyperon phenomenology has been troubled due to power-counting subtleties and to a possible slow convergence. Furthermore, the presence of baryon-resonances, e.g. the lowest-lying decuplet, complicates the approach, and the inclusion of their effects may become necessary. Recently, we have shown that a fairly good convergence is possible using a renormalization prescription of the loop-divergencies which recovers the power counting, is covariant and consistent with analyticity. Moreover, we have systematically incorporated the decuplet resonances taking care of both power-counting and $consistency$ problems. A model-independent understanding of diferent properties including the magnetic moments of the baryon-octet, the electromagnetic structure of the decuplet resonances and the hyperon vector coupling $f_1(0)$, has been successfully achieved within this approach. We will briefly review these developments and stress the important role they play for an accurate determination of the Cabibbo-Kobayashi-Maskawa matrix element $V_{us}$ from hyperon semileptonic decay data.

To appear in HypX Proceedings

References in corpus (9)

• Leading SU(3)-breaking corrections to the baryon magnetic moments in Chiral Perturbation Theory
• Electromagnetic structure of the lowest-lying decuplet resonances in covariant chiral perturbation theory
• Semileptonic decays of the light J(P)=1/2(+) ground state baryon octet
• Lattice study of flavor SU(3) breaking in hyperon beta decay
• Leading-order decuplet contributions to the baryon magnetic moments in Chiral Perturbation Theory
• First Lattice QCD Study of the Sigma -> n Axial and Vector Form Factors with SU(3) Breaking Corrections
• SU(3)-breaking corrections to the hyperon vector coupling $f_1(0)$ in covariant baryon chiral perturbation theory
• Chiral Corrections to the Hyperon Vector Form Factors
• Hyperon decay form factors in chiral perturbation theory

Cited by in corpus (2)

• The lowest-lying baryon masses in covariant SU(3)-flavor chiral perturbation theory
• Properties of the ground-state baryons in chiral perturbation theory