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The soliton bag model of Friedberg and Lee is investigated. We study in detail the numerical solution of the mean-field limit of the model and develop quantum corrections to this approximation. Both the MIT and SLAC bags are recovered as limiting cases of the model. The surface bag excitations coupled to quark-antiquark excitations and their relation to the virtual-meson cloud as well as other aspects of the model are discussed.
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Goldflam et al. (1982) studied this question.
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