黑暗企鹅在对撞机上发光
The Dark Penguin Shines Light at Colliders
摘要：
对撞机实验是限制暗物质相互作用的最有前途的方法之一。对于几种类型的DM-标准模型耦合，对结果的有意义的解释需要超越有效场论，考虑具有光介质的简化模型。这在环介导的相互作用的情况下尤其重要。在本文中，我们执行的磁偶极子相互作用DM的第一个简化模型研究，包括一个回路的动量依赖形状因子，调解耦合-给定的暗企鹅-在对撞机过程。我们计算边界的单喷流，双光子，双光子搜索的$8$和$14$ TeV LHC，并比较结果的直接和间接的检测实验。在$100$ TeV强子对撞机和在ILC的未来搜索也被解决。我们发现，最佳的搜索策略需要松散的削减失踪的横向能源，以捕获增强的形状因子的阈值附近的壳生产的调解人。我们认为这两个极小模型和模型的DM之外的一个额外的状态是可访问的。在后一种情况下，在暗区的无政府风味结构的假设下，LHC双光子和双光子搜索将能够设置比最小场景更强的边界。用$M_{T2}$变量来测定较重的暗费米子的质量也许是可行的。此外，如果暗企鹅味结构几乎与DM质量一致，则可以观察到较重的暗费米子衰变为DM和光子的位移信号。这使我们能够从现有的非指向光子搜索中对模型的混合和耦合设置约束。
英文摘要：
Collider experiments are one of the most promising ways to constrain Dark Matter (DM) interactions. For several types of DM-Standard Model couplings, a meaningful interpretation of the results requires to go beyond effective field theory, considering simplified models with light mediators. This is especially important in the case of loop-mediated interactions. In this paper we perform the first simplified model study of the magnetic dipole interacting DM, by including the one-loop momentum-dependent form factors that mediate the coupling -- given by the Dark Penguin -- in collider processes. We compute bounds from the monojet, monophoton, and diphoton searches at the $8$ and $14$ TeV LHC, and compare the results to those of direct and indirect detection experiments. Future searches at the $100$ TeV hadron collider and at the ILC are also addressed. We find that the optimal search strategy requires loose cuts on the missing transverse energy, to capture the enhancement of the form factors near the threshold for on-shell production of the mediators. We consider both minimal models and models where an additional state beyond the DM is accessible. In the latter case, under the assumption of anarchic flavor structure in the dark sector, the LHC monophoton and diphoton searches will be able to set much stronger bounds than in the minimal scenario. A determination of the mass of the heavier dark fermion might be feasible using the $M_{T2}$ variable. In addition, if the Dark Penguin flavor structure is almost aligned with that of the DM mass, a displaced signal from the decay of the heavier dark fermion into the DM and photon can be observed. This allows us to set constraints on the mixings and couplings of the model from an existing search for non-pointing photons.
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