SU(3) breaking effects in hyperon semi-leptonic decays and the extraction of F and D

The analysis of hyperon semi-leptonic decay data is re-examined in the light of a recent suggestion that SU (3) symmetry breaking effects may be taken into account by applying a correction to the FD ratio obtained via naïve linear extrapolation in the hyperon masses. Comparison is made with the physically better motivated approach of applying so-called centre-of-mass corrections. This study (including all available data) reveals certain shortcomings of the former of the above treatments, highlights some interesting aspects of this type of analysis and attempts to pinpoint the decay data that might usefully be improved. A tantalising result of the SU (3) breaking analysis performed here is that the magnitude of recoil correction required by the data corresponds closely to that required for the standard explanation of the reduction of gA from its SU (6) value of 53. We also comment on other recent suggestions for taking into account the effects of SU (3) breaking. Finally a few remarks are made on the relevance for predicting the flavour nonsinglet contribution to the proton g1 and the Ellis-Jaffe sum rule.