Kaon-nucleon couplings for weak decays of hypernuclei
- Department of Physics, Carnegie Mellon University, Pittsburgh, Pennsylvania 15213 (United States)
- Department of Physics, Duke University, Durham, North Carolina 27708 (United States)
We investigate the weak kaon-nucleon (NNK) {ital S}-wave and {ital P}-wave interactions using heavy baryon chiral perturbation theory. The leading one-loop SU(3) breaking contributions to the {ital ppK}, {ital pnK}, and {ital nnK} couplings are computed. We find that they suppress all NNK amplitudes by 30{percent} to 50{percent}. The ratio of neutron-induced to proton-induced hypernuclear decay widths is sensitive to such reductions. It has been argued that the discrepancy between the predicted and observed {ital P}-wave amplitudes in {Delta}{ital s}=1 hyperon decay results from an accidental cancellation between tree-level amplitudes, and is not a fundamental problem for chiral perturbation theory. Agreement between experimentally determined NNK {ital P}-wave amplitudes and our estimates would support this explanation. {copyright} {ital 1996 The American Physical Society.}
- Research Organization:
- Carnegie-Mellon University
- DOE Contract Number:
- FG02-91ER40682; FG05-90ER40592
- OSTI ID:
- 277424
- Journal Information:
- Physical Review, C, Vol. 53, Issue 1; Other Information: PBD: Jan 1996
- Country of Publication:
- United States
- Language:
- English
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