Abstract
A proton model with three valence quarks, a sea of nonstrange quark-antiquark pairs and no strange quarks is shown to fit all the EMC and semileptonic baryon decay data used in previous analyses. Conclusions requiring strange quarks in the proton are shown to depend crucially on a model-dependent assumption, invalid for this model, that SU(3) symmetry relates matrix elements of charged and neutral axial currents. The nonstrange sea breaks SU(3) badly and contributes to the neutral current matrix elements measured in the EMC experiment but not to the charged current matrix elements relevant to semileptonic decays. Thus the standard SU(3) analysis of semileptonic decays holds for this model but gives no information on the sea contribution to EMC.
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