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arXiv 0808.3787hep-ph
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SCET的手性反常

The Chiral Anomaly in SCET

Wouter J. Waalewijn

摘要:

反常现象是一种红外效应,但通常在有效理论中以非平凡的方式实现。本文研究了软共线有效理论(SCET)中的手征反常,其中反常方程在幂展开中有不同阶的贡献。在功率计数下,对SCET中的手征反常方程进行了非线性计算,得到了外共线和/或超软胶子的手征反常方程。我们利用QCD和SCET场之间的树级(LO in α_s)关系,将QCD反常方程展开。异常方程之间的这种对应关系的有效性是通过直接计算SCET中的单回路图来证实的。

英文摘要:

Anomalies are an infrared effect, but are often realized in effective theories in a non-trivial way. We study the chiral anomaly in Soft Collinear Effective Theory (SCET), where the anomaly equation has terms contributing at different orders in the power expansion. The chiral anomaly equations in SCET are computed up to NNLO in the power counting with external collinear and/or ultrasoft gluons. We do this by expanding the QCD anomaly equation, using the tree level (LO in α_s) relations between QCD and SCET fields. The validity of this correspondence between the anomaly equations is confirmed by direct computation of the one-loop diagrams in SCET.

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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