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arXiv 1302.6486hep-phhep-th
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体稳定化、超维Higgs入口和Higgs事件中的能量缺失

Bulk Stabilization, the Extra-Dimensional Higgs Portal and Missing Energy in Higgs Events

Ross Diener, C. P. Burgess

摘要:

为了解决层次问题,额外维度模型必须解释为什么新维度稳定在正确的大小,而已知的机制需要耦合到膜的体标量。由于这些耦合,维度稳定的能量学与希格斯真空的能量学竞争,具有潜在的可观察效应。这些效应对于一个或两个额外维度特别强,因为体-希格斯耦合可以是超重整化的或无量纲的。这种额外维度的希格斯“门户”的实验范围比引力耦合更强,因为它们在低能量下受到的抑制更少。我们计算如何通过这样一个门户与两个额外的维度希格斯体耦合反作用到希格斯玻色子的属性。当KK质量小于希格斯质量时,与KK模式的混合会导致不可见的希格斯衰变宽度,高能对撞机的能量信号丢失,以及恒星和超新星中能量损失的新机制。天体物理学的界限是对对撞机测量的补充,现有的限制允许可观测的LHC信号。我们评论的变化所造成的希格斯质量耦合关系的希格斯体混合,以及由此产生的修改如何运行的希格斯耦合改变真空稳定性和平凡的界限。

英文摘要:

To solve the hierarchy problem, extra-dimensional models must explain why the new dimensions stabilize to the right size, and the known mechanisms for doing so require bulk scalars that couple to the branes. Because of these couplings the energetics of dimensional stabilization competes with the energetics of the Higgs vacuum, with potentially observable effects. These effects are particularly strong for one or two extra dimensions because the bulk-Higgs couplings can then be super-renormalizable or dimensionless. Experimental reach for such extra-dimensional Higgs `portals' are stronger than for gravitational couplings because they are less suppressed at low-energies. We compute how Higgs-bulk coupling through such a portal with two extra dimensions back-reacts onto properties of the Higgs boson. When the KK mass is smaller than the Higgs mass, mixing with KK modes results in an invisible Higgs decay width, missing-energy signals at high-energy colliders, and new mechanisms of energy loss in stars and supernovae. Astrophysical bounds turn out to be complementary to collider measurements, with observable LHC signals allowed by existing constraints. We comment on the changes to the Higgs mass-coupling relationship caused by Higgs-bulk mixing, and how the resulting modifications to the running of Higgs couplings alter vacuum-stability and triviality bounds.

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