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arXiv 1209.3022hep-phhep-th
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光膨胀的有效理论

Effective Theory of a Light Dilaton

Zackaria Chacko, Rashmish K. Mishra

摘要:

我们考虑的情况下,强共形动力学构成紫外线完成的物理驱动电弱对称性破缺。我们表明,在理论中,负责破缺的共形对称性的运营商是接近边缘的破缺规模,的介子质量可以自然地低于规模的强动力学。然而,一般来说,在感兴趣的电弱对称性破缺的情况下,这个条件是不满足的,因此在这些理论中,光量子的存在与温和的调谐有关。在此框架下,我们构造了光量子的有效理论,并确定了它与标准模型态的耦合形式。我们发现,修正所产生的共形对称性破坏效应的相互作用的形式被抑制的平方比的强耦合尺度的介子质量,并在良好的理论控制。这些修正通常是次要的,除了在边缘算子的介子耦合的情况下,对称性破坏的影响有时可以占主导地位。我们调查的现象学影响,这些结果的模型的人工色,希格斯玻色子作为一个伪Nambu-戈德斯通玻色子,涉及强共形动力学在紫外线的模型。

英文摘要:

We consider scenarios where strong conformal dynamics constitutes the ultraviolet completion of the physics that drives electroweak symmetry breaking. We show that in theories where the operator responsible for the breaking of conformal symmetry is close to marginal at the breaking scale, the dilaton mass can naturally lie below the scale of the strong dynamics. However, in general this condition is not satisfied in the scenarios of interest for electroweak symmetry breaking, and so the presence of a light dilaton in these theories is associated with mild tuning. We construct the effective theory of the light dilaton in this framework, and determine the form of its couplings to Standard Model states. We show that corrections to the form of the dilaton interactions arising from conformal symmetry violating effects are suppressed by the square of the ratio of the dilaton mass to the strong coupling scale, and are under good theoretical control. These corrections are generally subleading, except in the case of dilaton couplings to marginal operators, when symmetry violating effects can sometimes dominate. We investigate the phenomenological implications of these results for models of technicolor, and for models of the Higgs as a pseudo-Nambu-Goldstone boson, that involve strong conformal dynamics in the ultraviolet.

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