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arXiv 0910.0930hep-thhep-ph
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次简单的量子场论

The Next-to-Simplest Quantum Field Theories

Shailesh Lal, Suvrat Raju

摘要:

我们描述了N=1和N=2规范理论中树振幅的新的壳层递归关系,并利用这些关系证明了纯N=1和N=2规范理论中S矩阵的结构类似于纯杨-米尔斯的结构.我们继续研究任意表象中耦合到物质的规范理论中的胶子散射。物质对气泡和三角形系数的贡献分别取决于物质表象的四阶和六阶指数。因此,单圈振幅没有气泡和三角形的条件可以写成一组包含这些高阶指数的线性丢番图方程。这些方程简化了超对称理论。我们提出了新的例子,超对称理论只有盒子(没有三角形或气泡在一个循环)和非超对称理论是免费的气泡。特别地,我们的结果表明,在N=2的SU(K)理论中,具有对称张量超多重态和反对称张量超多重态的单圈散射振幅与N=4理论中的单圈散射振幅相同.

英文摘要:

We describe new on-shell recursion relations for tree-amplitudes in N=1 and N=2 gauge theories and use these to show that the structure of the S-matrix in pure N=1 and N=2 gauge theories resembles that of pure Yang-Mills. We proceed to study gluon scattering in gauge theories coupled to matter in arbitrary representations. The contribution of matter to individual bubble and triangle coefficients can depend on the fourth and sixth order Indices of the matter representation respectively. So, the condition that one-loop amplitudes be free of bubbles and triangles can be written as a set of linear Diophantine equations involving these higher-order Indices. These equations simplify for supersymmetric theories. We present new examples of supersymmetric theories that have only boxes (and no triangles or bubbles at one-loop) and non-supersymmetric theories that are free of bubbles. In particular, our results indicate that one-loop scattering amplitudes in the N=2, SU(K) theory with a symmetric tensor hypermultiplet and an anti-symmetric tensor hypermultiplet are simple like those in the N=4 theory.

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