类希格斯膨胀子
A Higgslike Dilaton
摘要：
我们研究的可能性，最近发现的125 GeV的希格斯粒子的共振实际上对应于一个玻色子：尺度不变性的戈德斯通玻色子自发地打破了规模f。通过与LHC实验数据的比较，我们发现只要f ~ v，弱标度，一个强子就能再现新共振的耦合。这对应于只有电弱规范群下带电的算子才能获得VEVs的动力学假设。更困难的任务是保持光的质量与理论的动力学尺度λ ~ 4 π f相比。在一般的非超对称理论中，人们会期望玻色子的质量与λ相似。只有在某些百分比水平（或更糟）的调谐和/或额外的动力学假设的代价下，才能降低凝聚子的质量：人们需要抑制凝聚对真空能量的贡献（这将导致大的凝聚子四次耦合），并且只允许CFT几乎是边缘的变形。
英文摘要：
We examine the possibility that the recently discovered 125 GeV higgs like resonance actually corresponds to a dilaton: the Goldstone boson of scale invariance spontaneously broken at a scale f. Comparing to LHC data we find that a dilaton can reproduce the observed couplings of the new resonance as long as f ~ v, the weak scale. This corresponds to the dynamical assumption that only operators charged under the electroweak gauge group obtain VEVs. The more difficult task is to keep the mass of the dilaton light compared to the dynamical scale, Lambda ~ 4 pi f, of the theory. In generic, non-supersymmetric theories one would expect the dilaton mass to be similar to Lambda. The mass of the dilaton can only be lowered at the price of some percent level (or worse) tuning and/or additional dynamical assumptions: one needs to suppress the contribution of the condensate to the vacuum energy (which would lead to a large dilaton quartic coupling), and to allow only almost marginal deformations of the CFT.
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