Monojet与世界其他地区的比较I：T型通道型号
Monojet versus rest of the world I: t-channel Models
摘要：
利用有效场论（EFT）算子的单射流搜索通常被解释为对直接探测（DD）散射截面的鲁棒和模型无关的约束。同时，在大型强子对撞机上产生暗物质（DM）的介质粒子必须存在。该介体粒子可以在壳上产生，使得对介体粒子的直接搜索可以约束应用于单射流约束的有效算子。在这第一篇论文中，我们做了一个案例研究的t-通道模型在单喷射搜索，（标准模型单重态）DM是通过一个t-通道介导的粒子，其超对称模拟是squark对产生。我们比较单射流约束直接约束单或对生产的调解人从多射流加上失踪的能源搜索，我们确定的地区，后者占主导地位的前者。我们表明，计算边界使用超对称简化模型和窄宽度近似，在以前的工作中所做的文献中，错过了重要的定量效果。我们进行了完整的事件模拟和统计分析，我们计算的影响上和离壳生产的介导粒子，表明单喷流和多喷流加上丢失的能量搜索，以前推导的界限提供了更保守的界限比可以提取的包括所有相关的过程中的模拟。单喷流和超对称性搜索（SUSY）提供了一个范围广泛的参数空间可比的边界，与SUSY搜索通常提供更强的边界，除了在DM粒子和介质非常质量简并的区域。EFT近似很少能够再现实际极限。在接下来的第二篇论文中，我们考虑了s通道介质的情况。
英文摘要：
Monojet searches using Effective Field Theory (EFT) operators are usually interpreted as a robust and model independent constraint on direct detection (DD) scattering cross-sections. At the same time, a mediator particle must be present to produce the dark matter (DM) at the LHC. This mediator particle may be produced on shell, so that direct searches for the mediating particle can constrain the effective operator being applied to monojet constraints. In this first paper, we do a case study on t-channel models in monojet searches, where the (Standard Model singlet) DM is pair produced via a t-channel mediating particle, whose supersymmetric analogue is the squark. We compare monojet constraints to direct constraints on single or pair production of the mediator from multi-jets plus missing energy searches and we identify the regions where the latter dominate over the former. We show that computing bounds using supersymmetric simplified models and in the narrow width approximation, as done in previous work in the literature, misses important quantitative effects. We perform a full event simulation and statistical analysis, and we compute the effects of both on- and off-shell production of the mediating particle, showing that for both the monojet and multi-jets plus missing energy searches, previously derived bounds provided more conservative bounds than what can be extracted by including all relevant processes in the simulation. Monojets and searches for supersymmetry (SUSY) provide comparable bounds on a wide range of the parameter space, with SUSY searches usually providing stronger bounds, except in the regions where the DM particle and the mediator are very mass degenerate. The EFT approximation rarely is able to reproduce the actual limits. In a second paper to follow, we consider the case of s-channel mediators.
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