Supersymmetry and the LHC inverse problem
Supersymmetry and the LHC inverse problem
复制标题
超对称性和 LHC 逆问题
DOI：
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发表时间：
2005
期刊：
影响因子：
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通讯作者：
Lian
中科院分区：
文献类型：
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作者：
N. Arkani;G. Kane;J. Thaler;Lian
在LHC的实验证据中，物理学超越了标准模型，我们如何确定基本理论的性质？我们提出了一种方法来研究从LHC签名空间到低能超对称理论模型参数空间的“逆映射”，使用1808个LHC观测值，包括文献中提出的所有观测值和超对称标准模型的15维参数化。我们表明，在签名空间中的一个点的逆映射由参数空间中的一些孤岛，表明存在的“退化”-定性不同的模型具有相同的LHC签名。简并具有简单的物理特征，主要反映了电弱离子谱的离散模糊性，伴随着对剩余软参数的小调整。简并福尔斯的数量在1 < d < 100的范围内，这取决于级联衰变中是否大量产生了slepton。这个数字大到足以代表一个明确的挑战，但小到足以鼓励寻找新的可观测量，可以进一步打破简并，并在LHC确定我们关心的大部分超对称物理。退化的发生是因为签名不是独立的，我们的方法允许测试任何新的签名的独立性。我们的方法也可以应用于标准模型之外的任何其他物理理论，允许人们研究模型足迹在签名空间中的差异，并测试在LHC中区分新物理学的定性不同可能性的方法。
Given experimental evidence at the LHC for physics beyond the standard model, how can we determine the nature of the underlying theory? We initiate an approach to studying the ``inverse map from the space of LHC signatures to the parameter space of theoretical models within the context of low-energy supersymmetry, using 1808 LHC observables including essentially all those suggested in the literature and a 15 dimensional parametrization of the supersymmetric standard model. We show that the inverse map of a point in signature space consists of a number of isolated islands in parameter space, indicating the existence of ``degeneracies — qualitatively different models with the same LHC signatures. The degeneracies have simple physical characterizations, largely reflecting discrete ambiguities in electroweak-ino spectrum, accompanied by small adjustments for the remaining soft parameters. The number of degeneracies falls in the range 1 < d < 100, depending on whether or not sleptons are copiously produced in cascade decays. This number is large enough to represent a clear challenge but small enough to encourage looking for new observables that can further break the degeneracies and determine at the LHC most of the SUSY physics we care about. Degeneracies occur because signatures are not independent, and our approach allows testing of any new signature for its independence. Our methods can also be applied to any other theory of physics beyond the standard model, allowing one to study how model footprints differ in signature space and to test ways of distinguishing qualitatively different possibilities for new physics at the LHC.