Hyperon nonleptonic decays in chiral perturbation theory
Oct, 199121 pages
Published in:
- Nucl.Phys.B 375 (1992) 561-581
- Published: 1992
Report number:
- UCSD-PTH-91-24
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Abstract: (Elsevier)
Leading non-analytic corrections to hyperon non-leptonic decay amplitudes are calculated in chiral perturbation theory. The success of the Lee-Sugawara relation for S-wave amplitudes is understood in the context of chiral perturbation theory since the chiral logarithmic correction to this relation is small. Although corrections to individual S-wave amplitudes are more sizeable, good agreement with experiment is achieved. P-wave amplitudes are not well-described by the one-loop chiral perturbation theory calculation because the tree-level SU(3) symmetric contribution to these amplitudes is significantly suppressed. This suppression causes SU(3)-violating chiral corrections to dominate the P-wave amplitudes, making an accurate computation of these amplitudes impossible in chiral perturbation theory. The large chiral correction to the P-wave amplitudes does not imply a breakdown of chiral perturbation theory.- hyperon: nonleptonic decay
- nonleptonic decay: hyperon
- amplitude analysis
- perturbation theory: chiral
- partial wave
- symmetry: SU(3)
- numerical calculations: interpretation of experiments
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