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arXiv 1505.04411hep-th
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关于NLSM的单软和双软行为

On single and double soft behaviors in NLSM

Yi-Jian Du, Hui Luo

摘要:

本文研究了非线性西格玛模型(NLSM)中三能级离壳电流和在壳振幅的单软和双软行为。我们首先提出并证明了具有单个软粒子的树能级电流的主导软行为。在壳层上的极限,这个单一的软发射成为阿德勒的零。然后,我们建立了两个相邻的软粒子的树级电流的领先和次领先的软行为。通过对在壳极限的分析,我们得到了两个软粒子相邻时在壳振幅的双软行为。利用Kleiss-Kuijf(KK)关系,我们进一步得到了两个不相邻软粒子的振幅超前和次超前行为。

英文摘要:

In this paper, we study the single and double soft behaviors of tree level off-shell currents and on-shell amplitudes in nonlinear sigma model(NLSM). We first propose and prove the leading soft behavior of the tree level currents with a single soft particle. In the on-shell limit, this single soft emission becomes the Adler's zero. Then we establish the leading and sub-leading soft behaviors of tree level currents with two adjacent soft particles. With a careful analysis of the on-shell limit, we obtain the double soft behaviors of on-shell amplitudes where the two soft particles are adjacent to each other. By applying Kleiss-Kuijf (KK) relation, we further obtain the leading and sub-leading behaviors of amplitudes with two nonadjacent soft particles.

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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