Towards a No-Lose Theorem for Naturalness
Towards a No-Lose Theorem for Naturalness
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DOI：
10.1103/physrevd.93.055044
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发表时间：
2015-09
影响因子：
5
通讯作者：
D. Curtin;Prashant Saraswat
中科院分区：
文献类型：
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作者：
D. Curtin;Prashant Saraswat
我们推导出一个现象学的不输定理的自然性高达TeV规模，适用于当量子校正的希格斯质量从顶夸克被取消的扰动超出标准模型（BSM）粒子（顶部合作伙伴）的类似的多重性，由于一些对称性。LHC的搜索结果似乎已经不利于这些伙伴，如果他们是有色的。任何具有SM电荷和100TeV质量的伙伴都将被LHC和未来的100 TeV对撞机彻底探测。因此，我们专注于中立的顶级合作伙伴。虽然这些出现在孪生希格斯理论，我们分析中性的顶部合作伙伴作为模型独立的尽可能使用有效场理论和简化的模型方法。我们分类所有微扰中性的顶级合作伙伴结构，以计算其不可约的低能量签名在未来的轻子和强子对撞机，以及在每种情况下遭受的不可约调谐。我们的定理的核心是假设SM充电BSM状态出现在中性自然的UV完成，这是在所有已知的例子的情况。在100 TeV的对撞机上直接生产，然后允许在100 TeV的水平上探测这个尺度。我们发现，建议未来的对撞机探测任何这样的情况下的自然与10%或更好的调整。这为新的轻子和强子对撞机提供了非常强大的模型独立动力，它们串联起来充当发现一般自然性的机器。我们把我们的研究结果的背景下，讨论其他可能性的自然，包括“成群”的顶级合作伙伴，固有的非微扰或异国情调的物理，或理论没有SM带电状态的紫外线完成。实现一个具体的场景，避免我们的论点，同时仍然缺乏实验签名仍然是一个开放的模型建设的挑战。
We derive a phenomenological no-lose theorem for naturalness up to the TeV scale, which applies when quantum corrections to the Higgs mass from top quarks are canceled by perturbative beyond Standard Model (BSM) particles (top partners) of similar multiplicity due to to some symmetry. Null results from LHC searches already seem to disfavor such partners if they are colored. Any partners with SM charges and ∼TeV masses will be exhaustively probed by the LHC and a future 100 TeV collider. Therefore, we focus on neutral top partners. While these arise in twin Higgs theories, we analyze neutral top partners as model-independently as possible using effective field theory and simplified model methods. We classify all perturbative neutral top partner structures in order to compute their irreducible low-energy signatures at proposed future lepton and hadron colliders, as well as the irreducible tunings suffered in each scenario. Central to our theorem is the assumption that SM-charged BSM states appear in the UV completion of neutral naturalness, which is the case in all known examples. Direct production at the 100 TeV collider then allows this scale to be probed at the ∼10 TeV level. We find that proposed future colliders probe any such scenario of naturalness with tuning of 10% or better. This provides very strong model-independent motivation for both new lepton and hadron colliders, which in tandem act as discovery machines for general naturalness. We put our results in context by discussing other possibilities for naturalness, including “swarms” of top partners, inherently nonperturbative or exotic physics, or theories without SM-charged states in the UV completion. Realizing a concrete scenario which avoids our arguments while still lacking experimental signatures remains an open model-building challenge.