SU(3) Breaking in Hyperon Beta Decays: a Prediction for Xi0 -> Sigma+ e nu-bar
Abstract
On the basis of a previous analysis of hyperon semi-leptonic decay data, a prediction is presented for g1/f1 in the Xi0 -> Sigma+ e nu-bar beta-decay. The analysis takes into account SU(3) breaking in this sector via the inclusion of mass-driven corrections. A rather precise measurement of the above channel by the KTeV experiment at Fermilab will shortly be available. Since the dependence on the SU(3) parameters, F and D, is identical to that of the neutron beta-decay, such a measurement will provide a rather stringent test of SU(3) and the models used to describe its violation in these decays. The prediction given here for the above decay is g1/f1=1.17, which leads to a rate of 0.80 x 106 s-1 and thus a branching fraction of 2.3 x 10-4.
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