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arXiv 1201.3191hep-thhep-ph
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无质量粒子的树级S矩阵的探索

Exploration of the Tree-Level S-Matrix of Massless Particles

Paolo Benincasa

摘要:

近年来,BCFW结构为计算散射振幅提供了一个非常有力的工具,同时也揭示了微扰理论的结构。在这次演讲中,我们讨论了长期存在的问题,即当一些动量沿着某些复方向被取到无穷大时,振幅不会消失时产生的边界项。特别是,我们提供了一套新的壳递归关系有效的理论,并讨论其后果,我们的理解上的扰动理论结构的S-矩阵。

英文摘要:

In recent years, the BCFW construction provided a very powerful tool for computing scattering amplitudes as well as it shed light on the perturbation theory structure. In this talk, we discuss the long-standing issue of the boundary term arising when the amplitudes do not vanish as some momenta are taken to infinity along some complex direction. In particular, we provide a new set of on-shell recursion relations valid for such theories and discuss its consequences on our understanding on the perturbation theory structure of the S-Matrix.

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