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arXiv 1104.2050hep-thhep-ph
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N=4 SYM库仑支的巨大振幅

Massive amplitudes on the Coulomb branch of N=4 SYM

Nathaniel Craig, Henriette Elvang, Michael Kiermaier, Tracy Slatyer

摘要:

本文在N=4超杨-米尔斯理论的库仑分支上,对有质量外粒子的振幅进行了系统的研究:1)提出了无质量振幅在模空间原点处的(多)软标极限可以用来确定库仑分支振幅到质量的首阶。这在许多例子中得到证明。2)我们发现紧凑的明确的表达式几个塔的树级振幅,包括散射的两个大规模的W-玻色子与任何数量的正螺旋胶子,适用于所有的质量值。3)给出了库仑分支上的超振幅的一般结构。例如,n点“MHV带”超振幅与混合次数为4到12的格拉斯曼多项式成比例,这是由超对称性唯一确定的。我们发现明确的树级超级振幅这个MHV带和其他简单的部门的理论。4)构造了对偶共形生成元,并讨论了最简质量振幅的对偶共形性质。我们紧凑的振幅和超级振幅的表达式应该是理论和唯象的兴趣,特别是树级的结果结转到截断的理论与超对称性较低。

英文摘要:

We initiate a systematic study of amplitudes with massive external particles on the Coulomb-branch of N=4 super Yang Mills theory: 1) We propose that (multi-)soft-scalar limits of massless amplitudes at the origin of moduli space can be used to determine Coulomb-branch amplitudes to leading order in the mass. This is demonstrated in numerous examples. 2) We find compact explicit expressions for several towers of tree-level amplitudes, including scattering of two massive W-bosons with any number of positive helicity gluons, valid for all values of the mass. 3) We present the general structure of superamplitudes on the Coulomb branch. For example, the n-point "MHV-band" superamplitude is proportional to a Grassmann polynomial of mixed degree 4 to 12, which is uniquely determined by supersymmetry. We find explicit tree-level superamplitudes for this MHV band and for other simple sectors of the theory. 4) Dual conformal generators are constructed, and we explore the dual conformal properties of the simplest massive amplitudes. Our compact expressions for amplitudes and superamplitudes should be of both theoretical and phenomenological interest; in particular the tree-level results carry over to truncations of the theory with less supersymmetry.

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