Chiral Corrections to Hyperon Axial Form Factors

Details Chiral Corrections to Hyperon Axial Form Factors Chiral Corrections to Hyperon Axial Form Factors

2008-01-16

arxiv.org/abs/0801.2535v2

Phys.Rev.D77:094506,2008

Physics

High Energy Physics

High Energy Physics - Lattice

23 pages, 3 figures, typos corrected and a new NLO prediction added

Scientific paper

10.1103/PhysRevD.77.094506

We study the complete set of flavor changing hyperon axial current matrix elements at small momentum transfer. Using partially quenched heavy baryon chiral perturbation theory, we derive the chiral and momentum behavior of the axial and induced pseudoscalar form factors. The meson pole contributions to the latter posses a striking signal for chiral physics. We argue that the study of hyperon axial matrix elements enables a systematic lattice investigation of the efficacy of three flavor chiral expansions in the baryon sector. This can be achieved by considering chiral corrections to SU(3) symmetry predictions, and their partially quenched generalizations. In particular, despite the presence of eight unknown low-energy constants, we are able to make next-to-leading order symmetry breaking predictions for two linear combinations of axial charges.

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