Colorless Top Partners , a 125 GeV Higgs , and the Limits on Naturalness
Colorless Top Partners , a 125 GeV Higgs , and the Limits on Naturalness
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发表时间：
2016
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通讯作者：
G. Burdman;Z. Chacko;R. Harnik;L. Lima;C. Verhaaren
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作者：
G. Burdman;Z. Chacko;R. Harnik;L. Lima;C. Verhaaren
标准模型之外的物理学理论解决了等级问题，通常涉及顶级伙伴，即新粒子，它们抵消了与希格斯粒子与顶夸克的汤川耦合相关的二次发散。随着标准模型的扩展，包括新的有色粒子在对撞机搜索中受到压力，在强相互作用下顶级伙伴不带电荷的场景变得越来越引人注目。虽然直接搜索难以实现，但这些理论预测了希格斯玻色子与标准模型粒子的修正耦合。这导致了对希格斯粒子产生和衰变速率的修正，只要最上面的伙伴足够轻，理论就相应地自然，就可以在大型强子对撞机（LHC）上检测到希格斯粒子。在本文中，我们考虑三个理论，解决小层次问题，并涉及无色的顶部合作伙伴，特别是镜像双希格斯，折叠超对称，和古怪的小希格斯。对于每个模型，我们调查当前和未来的上限合作伙伴，以及相应的限制自然，可以从希格斯程序在LHC。我们的结论是，LHC将不能强烈地反对自然性，即使在14 TeV的3000 fb−1的数据下，仍允许在大约十分之一的水平上进行温和的调谐。
Theories of physics beyond the Standard Model that address the hierarchy problem generally involve top partners, new particles that cancel the quadratic divergences associated with the Yukawa coupling of the Higgs to the top quark. With extensions of the Standard Model that involve new colored particles coming under strain from collider searches, scenarios in which the top partners carry no charge under the strong interactions have become increasingly compelling. Although elusive for direct searches, these theories predict modified couplings of the Higgs boson to the Standard Model particles. This results in corrections to the Higgs production and decay rates that can be detected at the Large Hadron Collider (LHC) provided the top partners are sufficiently light, and the theory correspondingly natural. In this paper we consider three theories that address the little hierarchy problem and involve colorless top partners, specifically the Mirror Twin Higgs, Folded Supersymmetry, and the Quirky Little Higgs. For each model we investigate the current and future bounds on the top partners, and the corresponding limits on naturalness, that can be obtained from the Higgs program at the LHC. We conclude that the LHC will not be able to strongly disfavor naturalness, with mild tuning at the level of about one part in ten remaining allowed even with 3000 fb−1 of data at 14 TeV.