Abstract
Abstract We investigate the nonrelativistic quark model with a residual pion-quark interaction of the Weinberg-Schwinger type including p-wave and s-wave coupling. The pion-nucleon vertex is renormalised to third order in the pion-quark coupling constant ƒπ and adjusted to reproduce the empirical pion-nucleon coupling strength, leading to an axial charge gA = 1.42 and a value of ƒ π = 98.8 MeV. Including the pion exchange currents dynamically through one-pion loops, we reproduce the nucleon magnetic moments within less than 10% for any quark core radius 0.3 fm ⩽ rq ⩽ 0.7 fm. All these results change by less than 5% if the pion mass is varied from zero to its physical value.
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