The diquark and nucleon are studied in a non-local NJL model. We solve therelativistic Faddeev equation and compare the results with the ordinary NJLmodel. Although the model is quark confining, it is not diquark confining inthe rainbow-ladder approximation. We show that the off-shell contribution tothe diquark $T$ matrix is crucial for the structure of the nucleon: without itsinclusion the attraction in the scalar channel is too weak to form a three-bodybound state.
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机译：在非局部NJL模型中研究了双夸克和核子。我们求解相对论的Faddeev方程，并将结果与普通的NJL模型进行比较。尽管模型是夸克约束，但在彩虹梯形逼近中它不是双夸克约束。我们表明，脱壳对双夸克$ T $矩阵的贡献对于核子的结构至关重要：如果没有包含，则标量通道中的吸引力太弱而无法形成三体结合状态。
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