Simplified models for a first characterization of new physics at the LHC
Simplified models for a first characterization of new physics at the LHC
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DOI：
10.1103/physrevd.79.075020
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发表时间：
2009-04-01
影响因子：
5
通讯作者：
Toro, Natalia
中科院分区：
文献类型：
--
作者：
Alwall, Johan;Schuster, Philip C.;Toro, Natalia
低能超对称（SUSY）和其他几个解决层次问题的理论预测，在大型强子对撞机中，具有标准模型量子数的粒子会衰变为喷流、缺失能量和可能的轻子。如果在大型强子对撞机的数据中发现了过多的此类事件，那么描述它的理论框架对于约束新物理的结构至关重要。我们提出了四个故意简化模型的基础，每个模型仅由2-3个质量和4-5个分支比率指定，用于数据的第一次表征。这些简化模型与数据的拟合提供了与探测器效应无关的射流结构、电弱衰变和数据重味成分的定量描述。这些拟合，连同将其预测与数据分布进行比较的图表，可以用作描述任何完整理论模型中的数据的目标。
Low-energy supersymmetry (SUSY) and several other theories that address the hierarchy problem predict pair-production at the LHC of particles with standard model quantum numbers that decay to jets, missing energy, and possibly leptons. If an excess of such events is seen in LHC data, a theoretical framework in which to describe it will be essential to constraining the structure of the new physics. We propose a basis of four deliberately simplified models, each specified by only 2-3 masses and 4-5 branching ratios, for use in a first characterization of data. Fits of these simplified models to the data furnish a quantitative presentation of the jet structure, electroweak decays, and heavy-flavor content of the data, independent of detector effects. These fits, together with plots comparing their predictions to distributions in data, can be used as targets for describing the data within any full theoretical model.