Chiral Corrections to the Hyperon Vector Form Factors

Abstract

We present the complete calculation of the SU(3)-breaking corrections to the hyperon vector form factors up to O(p^4) in the Heavy Baryon Chiral Perturbation Theory. Because of the Ademollo-Gatto theorem, at this order the results do not depend on unknown low energy constants and allow to test the convergence of the chiral expansion. We complete and correct previous calculations and find that O(p^3) and O(1/M_0) corrections are important. We also study the inclusion of the decuplet degrees of freedom, showing that in this case the perturbative expansion is jeopardized. These results raise doubts on the reliability of the chiral expansion for hyperons.

20 pages, 4 figures, v2: published version

References in corpus (1)

• First Lattice QCD Study of the Sigma -> n Axial and Vector Form Factors with SU(3) Breaking Corrections

Cited by in corpus (9)

• Lattice study of flavor SU(3) breaking in hyperon beta decay
• Hyperons in Two Flavor Chiral Perturbation Theory
• Tests of non-standard electroweak couplings of right-handed quarks
• 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
• Hyperon decay form factors in chiral perturbation theory
• Decuplet contribution to the meson-baryon scattering lengths
• Analysis of the $\Sigma -n$ form factors with light-cone QCD sum rules
• Chiral corrections to the vector and axial couplings of quarks and baryons