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arXiv 1010.0445hep-phnucl-th
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夸克模型与1/Nc展开的匹配

Matching the quark model to the 1/Nc expansion

Dan Pirjol, Carlos Schat

摘要:

我们计算的有效质量算符的1/Nc展开为负宇称L=1激发重子使用Isgur-Karl模型的系数,以比较一般的方法,其中系数是通过拟合数据,与一个特定的组成夸克模型计算。我们讨论了最一般的两体夸克-夸克相互作用的标量部分的拟合系数背后的物理。我们发现,π交换和胶子交换导致了同一个算符在有效质量算符水平上的优势,这也是从数据中观察到的。

英文摘要:

We compute the coefficients of the effective mass operator of the 1/Nc expansion for negative parity L=1 excited baryons using the Isgur-Karl model in order to compare the general approach, where the coefficients are obtained by fitting to data, with a specific constituent quark model calculation. We discuss the physics behind the fitted coefficients for the scalar part of the most general two-body quark-quark interaction. We find that both pion exchange and gluon exchange lead to the dominance of the same operator at the level of the effective mass operator, which is also observed from data.

机构、总结、中文摘要均由AI分析而来,可能存在错误,请以论文正文为准。

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