Physics – High Energy Physics – High Energy Physics - Phenomenology
Scientific paper
1999-10-08
Phys.Rev. D61 (2000) 114006
Physics
High Energy Physics
High Energy Physics - Phenomenology
The final version accepted for publication in Phys. Rev. D. 18 pages, RevTex is used with 4 figures included
Scientific paper
10.1103/PhysRevD.61.114006
We investigate the hyperon semileptonic decays and the quark spin content of the proton $\Delta \Sigma$ taking into account flavor SU(3) symmetry breaking. Symmetry breaking is implemented with the help of the chiral quark-soliton model in an approach, in which the dynamical parameters are fixed by the experimental data for six hyperon semileptonic decay constants. As a result we predict the unmeasured decay constants, particularly for $\Xi^0 \to \Sigma^+$, which will be soon measured and examine the effect of the SU(3) symmetry breaking on the spin content $\Delta \Sigma $ of the proton. Unfortunately large experimental errors of $\Xi^-$ decays propagate in our analysis making $\Delta \Sigma$ and $\Delta s$ practically undetermined. We conclude that statements concerning the values of these two quantities, which are based on the exact SU(3) symmetry, are premature. We stress that the meaningful results can be obtained only if the experimental errors for the $\Xi$ decays are reduced.
Goeke Klaus
Kim Hyun-Chul
Praszalowicz Michal
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