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arXiv 1207.4482hep-ph
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在LHC的自然度是2:1?

2:1 for Naturalness at the LHC?

Nima Arkani-Hamed, Kfir Blum, Raffaele Tito D'Agnolo, JiJi Fan

摘要:

在双光子通道中,希格斯粒子的产生和衰变大大增强了1.5 - 2倍,而在ZZ通道中几乎没有偏差,这只能由与希格斯粒子有大耦合的新带电粒子环产生。我们表明,只允许新的费米子在弱尺度的边缘相互作用,所需的汤川耦合的2倍增强是如此之大,希格斯四次耦合被推到大的负值在紫外线,引发一个不可接受的真空不稳定性远低于10 TeV的规模。如果带电费米子的能量小于150 GeV,则可以容纳1.5倍的增强,在LHC运行的8 TeV的几乎所有情况下,甚至在最困难的情况下,在14 TeV下,都可以发现。因此,如果双光子增强能经受住进一步的检验,并且没有发现150 GeV以下的带电费米子,那么一定有远低于10 TeV的新玻色子。这将明确地排除一大类标准模型之外的物理学微调理论,包括分裂超对称性及其许多变体,并为TeV尺度下的电弱对称性破缺的自然理论提供强有力的间接证据。或者,在弱尺度下只有单个微调希格斯玻色子和新费米子的理论,在截止值远大于10 TeV尺度的情况下没有额外的标量或规范玻色子,可以明确地预测,当前数据中大双光子增强的暗示将消失。

英文摘要:

A large enhancement of a factor of 1.5 - 2 in Higgs production and decay in the diphoton channel, with little deviation in the ZZ channel, can only plausibly arise from a loop of new charged particles with large couplings to the Higgs. We show that, allowing only new fermions with marginal interactions at the weak scale, the required Yukawa couplings for a factor of 2 enhancement are so large that the Higgs quartic coupling is pushed to large negative values in the UV, triggering an unacceptable vacuum instability far beneath the 10 TeV scale. An enhancement by a factor of 1.5 can be accommodated if the charged fermions are lighter than 150 GeV, within reach of discovery in almost all cases in the 8 TeV run at the LHC, and in even the most difficult cases at 14 TeV. Thus if the diphoton enhancement survives further scrutiny, and no charged fermions beneath 150 GeV are found, there must be new bosons far beneath the 10 TeV scale. This would unambiguously rule out a large class of fine-tuned theories for physics beyond the Standard Model, including split SUSY and many of its variants, and provide strong circumstantial evidence for a natural theory of electroweak symmetry breaking at the TeV scale. Alternately, theories with only a single fine-tuned Higgs and new fermions at the weak scale, with no additional scalars or gauge bosons up to a cutoff much larger than the 10 TeV scale, unambiguously predict that the hints for a large diphoton enhancement in the current data will disappear.

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