手征反常与手征夸克孤子模型中的核子自旋分解
Chiral anomaly and nucleon spin decomposition in the chiral quark soliton model
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中文总结 AI 辅助
本研究在手征夸克孤子模型中引入手征反常诱导的味单态赝标量场,计算核子自旋分解,发现该场增强夸克螺旋度贡献,增大质量则抑制增强并增加轨道贡献,但整体影响适度,不改变传统模型结论。
中文摘要 AI 辅助
我们研究了手征反常如何影响核子自旋在夸克自旋与轨道运动之间的分解。我们通过引入一个味单态赝标量场来扩展手征夸克孤子模型,该场的质量由手征反常产生。在此框架内,我们计算了夸克和反夸克的自旋螺旋度及轨道角动量分布,并考虑了由孤子旋转诱导的单态场效应。我们在保持其余模型参数不变的情况下改变反常诱导质量,以考察反常对自旋分解的影响。与传统的仅含π介子模型相比,诱导场增强了夸克螺旋度贡献。增大该质量会抑制这种增强并增加轨道贡献,而这两部分贡献仍共同构成核子自旋。在所考察的参数范围内,这种重新分配是适度的,并未从根本上改变传统模型的自旋分解。
英文摘要
We investigate how the chiral anomaly influences the decomposition of nucleon spin between quark spin and orbital motion. We extend the chiral quark soliton model by including a flavor-singlet pseudoscalar field whose mass is generated by the chiral anomaly. Within this framework, we calculate the quark and antiquark helicity and orbital angular momentum distributions, accounting for the singlet field induced by the rotation of the soliton. We vary the anomaly-induced mass while keeping the remaining model parameters fixed to examine how the anomaly affects the spin decomposition. The induced field enhances the quark helicity contribution relative to the conventional pion-only model. Increasing the mass suppresses this enhancement and increases the orbital contribution, while the two contributions continue to account for the nucleon spin. This redistribution remains modest over the parameter values considered and does not qualitatively alter the spin decomposition of the conventional model.
发表机构
- The University of Tokyo(东京大学)
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