Discovery reach for generic supersymmetry at the LHC: MT2 versus missing transverse momentum selections for pMSSM searches
Discovery reach for generic supersymmetry at the LHC: MT2 versus missing transverse momentum selections for pMSSM searches
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LHC 通用超对称性的发现：MT2 与 pMSSM 搜索缺失横向动量选择
DOI：
10.1007/jhep07(2011)104
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发表时间：
2011
影响因子：
5.4
通讯作者：
C. Gwenlan
中科院分区：
文献类型：
--
作者：
B. Allanach;A. Barr;A. Dafinca;C. Gwenlan
大型强子对撞机使用早期数据的通用实验采用了不同的超对称搜索策略。正如他们的早期结果所证明的那样，这些策略是有希望的，但也提出了一个问题，即它们在未来的推广效果如何。我们通过研究2000个现象学最小超对称标准模型参数空间点来解决这个问题，这些点来自于对间接和宇宙学数据的拟合。考虑到标准模型背景，我们使用基于缺失横向动量（MET）的典型atlas型搜索、基于优化MT2切割的搜索以及两者的组合来检查点的5σ可发现性。策略的发现范围很大程度上依赖于背景中的系统不确定性，受裁剪的严格性和背景仿真的细节的影响。通过结合基于MET和MT2的策略，在7 TeV下的综合亮度为1 fb−1 (10 fb−1)，根据背景的系统不确定性，可以发现4-8%（42%）的点。在14tev和10fb−1时，96%的点被发现。虽然大多数点都可以在$ \sqrt {s} = 14 $ TeV和1fb−1时被两种策略发现，但仍有一些点未被MET搜索策略发现，但被MT2策略发现，反之亦然，因此必须并行执行这两种策略。我们讨论了一些可能使观点更难观察的因素。
Different search strategies for supersymmetry have been employed by the LHC general-purpose experiments using early data. As proven by their early results, these strategies are promising, but raise the question of how well they will generalize for the future. We address this question by studying two thousand phenomenological minimal supersymmetric standard model parameter space points that come from a fit to indirect and cosmological data. We examine the 5σ discoverability of the points employing a typical ATLAS-type search based on missing transverse momentum (MET), a search based on an optimised MT2 cut and a combination of the two, taking into account standard model backgrounds. The discovery reach of the strategies can depend strongly on the systematic uncertainty in the background, subject to the stringency of the cuts and the details of the background simulation. By combining the MET and MT2 based strategies, with an integrated luminosity of 1 fb−1 (10 fb−1) at 7 TeV, 4-8%(42%) of the points are discoverable, depending on the systematic uncertainty on the background. At 14TeVand with10fb−1, 96% of the points are discoverable. While the majority of points can be discovered by both strategies at $ \sqrt {s} = 14 $ TeV and with 1fb−1, there are some that are left undiscovered by a MET search strategy, but which are discovered by the MT2 strategy, and vice versa, therefore it is essential that one performs both in parallel. We discuss some of the factors that can make points more difficult to observe.
影响因子：
3.3
作者：
S. Gieseke;D. Grellscheid;Keith Hamilton;A. Papaefstathiou;S. Plätzer;P. Richardson;C. Rohr;P. Ruzicka;A. Siódmok;L. Suter;D. Winn
通讯作者：
S. Gieseke;D. Grellscheid;Keith Hamilton;A. Papaefstathiou;S. Plätzer;P. Richardson;C. Rohr;P. Ruzicka;A. Siódmok;L. Suter;D. Winn