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arXiv 1602.02793hep-phhep-exhep-th
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弯曲紧化的Kaluza-Klein引力子现象学和750 GeV双光子过剩

Kaluza-Klein graviton phenomenology for warped compactifications, and the 750 GeV diphoton excess

Steven B. Giddings, Hao Zhang

摘要:

在TeV尺度的碰撞中,对于额外维度的普遍预测是存在引力子的卡鲁扎-克莱因激发。对于一个广泛的强扭曲的场景,人们希望最初找到一个孤立的共振,其现象在最简单的情况下是由一个简化的模型描述的两个参数,它的质量,和一个常数$Λ$与质量单位参数化其耦合到标准模型应力张量。这些参数又由翘曲紧化的几何构型决定。我们探讨了最近在ATLAS和CMS的13 TeV数据中看到的750 GeV过量可能是这种扭曲的卡鲁扎-克莱因引力子的可能性,并找到了最佳拟合值$Λ\approx 60$ TeV。我们发现,虽然有一些紧张之间的解释和数据从8 TeV和双轻子通道在13 TeV,它并没有被强烈排除。然而,在这种最简单的情况下,这样的信号很快就会在双光子和双轻子通道中变得明显。

英文摘要:

A generic prediction of scenarios with extra dimensions accessible in TeV-scale collisions is the existence of Kaluza-Klein excitations of the graviton. For a broad class of strongly-warped scenarios one expects to initially find an isolated resonance, whose phenomenology in the simplest cases is described by a simplified model with two parameters, its mass, and a constant $Λ$ with units of mass parameterizing its coupling to the Standard Model stress tensor. These parameters are in turn determined by the geometrical configuration of the warped compactification. We explore the possibility that the 750 GeV excess recently seen in 13 TeV data at ATLAS and CMS could be such a warped Kaluza-Klein graviton, and find a best-fit value $Λ\approx 60$ TeV. We find that while there is some tension between this interpretation and data from 8 TeV and from the dilepton channel at 13 TeV, it is not strongly excluded. However, in the simplest scenarios of this kind, such a signal should soon become apparent in both diphoton and dilepton channels.

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