Chiral Corrections to the Hyperon Vector Form Factors

Details Chiral Corrections to the Hyperon Vector Form Factors Chiral Corrections to the Hyperon Vector Form Factors

2006-03-28

arxiv.org/abs/hep-ph/0603226v2

Phys.Rev. D74 (2006) 014018

Physics

High Energy Physics

High Energy Physics - Phenomenology

20 pages, 4 figures, v2: published version

Scientific paper

10.1103/PhysRevD.74.014018

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.

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