Phenomenology of relaxion-Higgs mixing
Phenomenology of relaxion-Higgs mixing
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DOI：
10.1007/jhep06(2017)050
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发表时间：
2017-06-12
影响因子：
5.4
通讯作者：
Perez, Gilad
中科院分区：
文献类型：
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作者：
Flacke, Thomas;Frugiuele, Claudia;Perez, Gilad
我们证明了弛豫一般在一个点上停止滚动，从而导致弛豫-希格斯混合。这为各种观测探测器打开了大门，因为可能的弛豫质量跨越了从亚电子伏到GeV尺度的广泛范围。我们从当前的实验（第五力、天体物理和宇宙探测器、束流堆、风味、LEP和LHC）中得出约束条件，并从NA62、SHiP和PIXIE等未来实验中提出预测。我们发现参数空间的一个很大的区域已经在实验的审查之下。我们推导出的所有实验约束同样适用于一般希格斯入口模型。此外，我们表明，简单的多轴（发条）UV补全存在轻微的微调问题，该问题随着位点数量的增加而增加。这些结果倾向于一个比现有理论界限更低的截止尺度。
We show that the relaxion generically stops its rolling at a point that breaks CP leading to relaxion-Higgs mixing. This opens the door to a variety of observational probes since the possible relaxion mass spans a broad range from sub-eV to the GeV scale. We derive constraints from current experiments (fifth force, astrophysical and cosmological probes, beam dump, flavour, LEP and LHC) and present projections from future experiments such as NA62, SHiP and PIXIE. We find that a large region of the parameter space is already under the experimental scrutiny. All the experimental constraints we derive are equally applicable for general Higgs portal models. In addition, we show that simple multiaxion (clockwork) UV completions suffer from a mild fine tuning problem, which increases with the number of sites. These results favour a cut-off scale lower than the existing theoretical bounds.