Title: SU(4) Chiral Quark Model with Configuration Mixing Show Chinese title

Title: SU(4) 伴随夸克模型与组态混合

Abstract: Chiral quark model with configuration mixing and broken SU(3)\times U(1) symmetry has been extended to include the contribution from c\bar c fluctuations by considering broken SU(4) instead of SU(3). The implications of such a model have been studied for quark flavor and spin distribution functions corresponding to E866 and the NMC data. The predicted parameters regarding the charm spin distribution functions, for example, \Delta c, \frac{\Delta c}{{\Delta \Sigma}}, \frac{\Delta c}{c} as well as the charm quark distribution functions, for example, \bar c, \frac{2\bar c}{(\bar u+\bar d)}, \frac{2 \bar c}{(u+d)} and \frac{(c+ \bar c)}{\sum (q+\bar q)} are in agreement with other similar calculations. Specifically, we find \Delta c=-0.009, \frac{\Delta c}{{\Delta \Sigma}}=-0.02, \bar c=0.03 and \frac{(c+ \bar c)}{\sum (q+\bar q)}=0.02 for the \chiQM parameters a=0.1, \alpha=0.4, \beta=0.7, \zeta_{E866}=-1-2 \beta, \zeta_{NMC}=-2-2 \beta and \gamma=0.3, the latter appears due to the extension of SU(3) to SU(4). Show Chinese abstract

Abstract: 手征夸克模型，包含组态混合和破缺的SU(3)\times U(1)对称性，通过考虑破缺的SU(4)而非SU(3)来包括c\bar c涨落的贡献。 该模型的影响已针对E866和NMC数据对应的手征夸克味和自旋分布函数进行了研究。 预测的关于魅夸克自旋分布函数的参数，例如，\Delta c, \frac{\Delta c}{{\Delta \Sigma}}, \frac{\Delta c}{c}以及魅夸克分布函数，例如，\bar c, \frac{2\bar c}{(\bar u+\bar d)}, \frac{2 \bar c}{(u+d)} 和 \frac{(c+ \bar c)}{\sum (q+\bar q)}与其他类似计算的结果一致。 具体来说，我们找到\Delta c=-0.009，\frac{\Delta c}{{\Delta \Sigma}}=-0.02，\bar c=0.03 和\frac{(c+ \bar c)}{\sum (q+\bar q)}=0.02 对于\chiQM 参数 a=0.1，\alpha=0.4 ，\beta=0.7 ，\zeta _{E866}=-1-2\beta ，\zeta _{NMC}=-2-2\beta 和\gamma=0.3 ，后者是由于 SU(3) 扩展到 SU(4) 引起的。