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arXiv 1306.6073hep-phhep-exnucl-th
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核子电磁耦合的相对论π环修正剖析

Anatomy of relativistic pion loop corrections to the electromagnetic nucleon coupling

Chueng-Ryong Ji, W. Melnitchouk, A. W. Thomas

摘要:

我们提出了光阵面上光子与核子耦合的π环修正的相对论公式。顶点和波函数重整化常数计算到最低阶的π介子场,包括其非解析行为的手征极限,并研究了数值作为一个功能的紫外截止。特别注意明确验证规范不变性和Ward-Takahashi恒等式约束的m_pi展开的所有订单。结果被用来计算手征修正的矩阵元素的本地运营商,有关的时刻的深度非弹性结构功能。最后,赝矢量和赝标量耦合的结果的比较,允许解决一个长期存在的难题,在计算的π云修正结构功能的时刻。

英文摘要:

We present a relativistic formulation of pion loop corrections to the coupling of photons with nucleons on the light-front. Vertex and wave function renormalization constants are computed to lowest order in the pion field, including their nonanalytic behavior in the chiral limit, and studied numerically as a function of the ultraviolet cutoff. Particular care is taken to explicitly verify gauge invariance and Ward-Takahashi identity constraints to all orders in the m_pi expansion. The results are used to compute the chiral corrections to matrix elements of local operators, related to moments of deep-inelastic structure functions. Finally, comparisons of results for pseudovector and pseudoscalar coupling allows the resolution of a long-standing puzzle in the computation of pion cloud corrections to structure function moments.

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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