梦醒时分：在LHC的超对称性发现中解开潜在的物理学
Dreaming Awake: Disentangling the Underlying Physics in Case of a SUSY-like Discovery at the LHC
摘要：
这篇评论的目的是调查什么样的物理可以提取在大型强子对撞机，假设一个发现是在失踪的横向动量的事件，一般预期在超对称性（SUSY）与R-宇称守恒。为了设置场景，我们首先讨论六种可能的电弱子基准场景的对撞机现象学，因为它们提供了对LHC可能面临的问题的宝贵见解。我们回顾了现有的方法，从测量的运动学端点的分布适当的变量，例如，各种可见衰变产物的不变质量，以及变量的$M_{T2}$和$M_2$类型。我们建议将这些方法的应用扩展到各种拓扑结构的完全强子的最终状态，可能与强子重建的大质量玻色子（W，Z或h）。我们测试的想法与简化的模拟事件中的主要electroweakino基准场景。我们发现，完全强子事件允许完全确定相关的质谱。为了比较，我们还审查了潜在的标准运动学终点方法的最终状态，涉及轻子衰变（上壳或离壳）slepton。我们发现，与300 $fb^{-1}$，轻子事件的统计是非常边缘的，他们看起来不太有希望比完全强子通道。这与通常的范式完全相反，在通常的范式中，轻子事件构成了镀金的超对称性通道。最后，我们将所有可用的信息汇总在一起，并总结可以达到的对基础物理学的理解水平。我们表明，作为质量重建的副产品，它也可以确定的生产截面和衰变分支比，这反过来又使我们能够查明的基础模型。
英文摘要：
The purpose of this review is to investigate what kind of physics can be extracted at the LHC, assuming a discovery is made in events with missing transverse momentum, as generically expected in supersymmetry (SUSY) with R-parity conservation. To set the scene, we first discuss the collider phenomenology of the six possible electroweakino benchmark scenarios, as they provide valuable insight into what one might be facing at the LHC. We review the existing methods for mass reconstruction from measured kinematic endpoints in the distributions of suitable variables, e.g., the invariant masses of various sets of visible decay products, as well as the $M_{T2}$ and the $M_2$ types of variables. We propose to extend the application of these methods to the various topologies of fully hadronic final states, possibly with hadronically reconstructed massive bosons (W, Z or h). We test the idea with a simplified simulation of events in the main electroweakino benchmark scenarios. We find that the fully hadronic events allow the complete determination of the relevant mass spectrum. For comparison, we also review the potential of the standard kinematic endpoint methods for final states involving leptons from the decays of (on-shell or off-shell) sleptons. We find that with 300 $fb^{-1}$, the statistics for the leptonic events is very marginal and they look less promising than the fully hadronic channels. This corresponds to a complete reversal of the usual paradigm, where leptonic events comprised the gold-plated SUSY channels. Finally, we put together all available information and summarize what level of understanding of the underlying physics can be achieved. We show that, as a by-product of the mass reconstruction, it is also possible to determine the production cross sections and decay branching ratios, which in turn enable us to pinpoint the underlying model.
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