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arXiv 1606.02722hep-phhep-ex
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LHC暗物质探测器的EFT振幅归一化

Unitarisation of EFT Amplitudes for Dark Matter Searches at the LHC

Nicole F. Bell, Giorgio Busoni, Archil Kobakhidze, David M. Long, Michael A. Schmidt

摘要:

我们提出了一种新的方法,大型强子对撞机暗物质搜索分析的有效场论(EFT)的框架内,利用K-矩阵酉化形式主义。这种方法提供了一个合理的估计暗物质生产截面在高能量,因此允许可靠的界限被放置在截断尺度的相关运营商,而不会遇到的问题微扰么正性破坏。我们在共线近似下对单喷流暗物质搜索中的有效算子D5进行了验证。我们比较我们的边界使用截断方法获得的,并确定一个参数区域的unitarisation处方导致更严格的界限。

英文摘要:

We propose a new approach to the LHC dark matter search analysis within the effective field theory (EFT) framework by utilising the K-matrix unitarisation formalism. This approach provides a reasonable estimate of the dark matter production cross section at high energies, and hence allows reliable bounds to be placed on the cut-off scale of relevant operators without running into the problem of perturbative unitarity violation. We exemplify this procedure for the effective operator D5 in monojet dark matter searches in the collinear approximation. We compare our bounds to those obtained using the truncation method and identify a parameter region where the unitarisation prescription leads to more stringent bounds.

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