Higgs Couplings and Naturalness
Higgs Couplings and Naturalness
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DOI：
10.1103/physrevd.90.015014
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发表时间：
2013-05
影响因子：
5
通讯作者：
M. Farina;M. Perelstein;Nicolas Rey-Le Lorier
中科院分区：
文献类型：
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作者：
M. Farina;M. Perelstein;Nicolas Rey-Le Lorier
标准模型的许多扩展都假设存在新的弱耦合粒子，即 TeV 尺度或以下的顶部伙伴。顶部伙伴的作用是消除由于顶部环导致的希格斯质量参数的二次发散。我们指出自然性（获得观察到的电弱尺度所需的微调程度）与顶部伙伴环对希格斯与光子和胶子耦合的贡献大小之间的一般相关性。如果需要重新调整达到或低于某个水平，则可以对这些希格斯耦合与标准模型的偏差设置一个与模型无关的下限（假设来自不同来源的贡献之间没有抵消）。相反，如果希格斯耦合的精确测量显示与标准模型没有偏差，则需要进行一定量的微调。我们量化了这种联系，并认为以百分比水平测量希格斯耦合将提供对自然性的严肃而稳健的测试。
Many extensions of the Standard Model postulate the existence of new weakly coupled particles, the top partners, at or below the TeV scale. The role of the top partners is to cancel the quadratic divergence in the Higgs mass parameter due to top loops. We point out the generic correlation between naturalness (the degree of ne-tuning required to obtain the observed electroweak scale), and the size of top partner loop contributions to Higgs couplings to photons and gluons. If the ne-tuning is required to be at or below a certain level, a model-independent lower bound on the deviations of these Higgs couplings from the Standard Model can be placed (assuming no cancellations between contributions from various sources). Conversely, if a precise measurement of the Higgs couplings shows no deviation from the Standard Model, a certain amount of ne-tuning would be required. We quantify this connection, and argue that a measurement of the Higgs couplings at the per-cent level would provide a serious and robust test of naturalness.