Chiral corrections to hyperon axial form factors

Journal Article · Thu May 01 04:00:00 EDT 2008 · Physical Review. D, Particles Fields

DOI:https://doi.org/10.1103/PHYSREVD.77.094506· OSTI ID:21250136

Fujiun, Jiang ^[1]; Tiburzi, B C ^[2]

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1. Institute for Theoretical Physics, Bern University, Sidlerstrasse 5, CH-3012 Bern (Switzerland)
2. Department of Physics, Duke University, Box 90305, Durham, North Carolina 27708-0305 (United States)

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.

• OSTI ID: 21250136
• Journal Information: Physical Review. D, Particles Fields, Journal Name: Physical Review. D, Particles Fields Journal Issue: 9 Vol. 77; ISSN PRVDAQ; ISSN 0556-2821
• Country of Publication: United States
• Language: English

Related Subjects

72 PHYSICS OF ELEMENTARY PARTICLES AND FIELDS
BARYONS
CHIRALITY
CORRECTIONS
FLAVOR MODEL
FORECASTING
FORM FACTORS
HYPERONS
MATRIX ELEMENTS
MESONS
MOMENTUM TRANSFER
PERTURBATION THEORY
SU-3 GROUPS
SYMMETRY BREAKING