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arXiv 0902.1906hep-thhep-ph
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S-矩阵等价恢复

S-matrix equivalence restored

Chih-Hao Fu, Jonathan Fudger, Paul R. W. Mansfield, Tim R. Morris, Zhiguang Xiao

摘要:

将光锥杨-米尔斯理论映射到MHV规则的拉格朗日描述的正则变换是非局部的,因此两组场不一定生成相同的S-矩阵。通过导出正则变换展开系数的一个新的递推关系,我们找到了这些系数与树级光锥图之间的直接映射。我们用这一点来表明,至少到一个循环的维数正则化的MHV顶点,唯一的区别是省略了一个循环的振幅,其中所有的胶子有积极的螺旋性。

英文摘要:

The canonical transformation that maps light-cone Yang-Mills theory to a Lagrangian description of the MHV rules is non-local, consequently the two sets of fields do not necessarily generate the same S-matrix. By deriving a new recursion relation for the canonical transformation expansion coefficients, we find a direct map between these coefficients and tree level light-cone diagrams. We use this to show that, at least up to one-loop with dimensionally regularised MHV vertices, the only difference is the omission of the one-loop amplitudes in which all gluons have positive helicity.

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