symmetry breaking in hyperon semileptonic decays
- 5 October 1998
- journal article
- Published by American Physical Society (APS) in Physical Review D
- Vol. 58 (9)
- https://doi.org/10.1103/physrevd.58.094028
Abstract
Flavor SU(3) symmetry breaking in the hyperon semileptonic decay form-factors is analyzed using the 1/N expansion. A detailed comparison with experimental data shows that corrections to f_1 are approximately 10%, which agrees with theoretical expectations. Corrections to g_1 are compatible with first-order symmetry breaking. A fit to the experimental data allows one to predict the g_1 form factor for Xi^0 -> Sigma^+ decay. The proton matrix element of the T^8 component of the axial current (which is equal to 3F-D in the SU(3) symmetry limit) is found to be approximately 0.34.Comment: 18 pages (revtex). Discussion of theory errors added. Two redundant parameters for symmetry breaking in f1 deleted. Central values for the fits remain unchanged, but some of the errors are modifieKeywords
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