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arXiv 1105.5385hep-thhep-ph
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无质量振幅的库仑支S矩阵

The Coulomb-branch S-matrix from massless amplitudes

Michael Kiermaier

摘要:

本文提出了一种从模空间原点的壳层振幅的软标量极限中提取N=4 SYM库仑支上的整个树级S矩阵的系统方法。因此,自发破碎理论中的大质量振幅可以从无质量、未破碎理论中的壳层振幅计算出来。为了检查这种对应关系,我们首先证明,软共线发散所需的无质量振幅取消了明智的选择软标量动量。然后,我们明确验证我们的建议的例子中任意多个外部腿和所有订单的质量。作为一个副产品,建设导致一个大规模的CSW样的扩展,再现了几个已知的所有N结果的库仑分支振幅在一个毫不费力的方式。我们简要地讨论我们的方法循环被积函数的扩展。

英文摘要:

We present a systematic method to extract the entire tree-level S-matrix on the Coulomb branch of N=4 SYM from soft-scalar limits of on-shell amplitudes at the origin of moduli space. Massive amplitudes in the spontaneously-broken theory can thus be computed from on-shell amplitudes in the massless, unbroken theory. To check this correspondence, we first prove that soft and collinear divergences in the required massless amplitudes cancel for a judicious choice of soft-scalar momenta. We then explicitly verify our proposal in examples with arbitrarily many external legs and to all orders in the mass. As a byproduct, the construction leads to a massive CSW-like expansion that reproduces several known all-n results for Coulomb-branch amplitudes in an effortless way. We briefly discuss the extension of our method to loop integrands.

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