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arXiv 0911.2607hep-ph
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在LHC上用运动学拟合确定超对称质量

Determination of supersymmetric masses using kinematic fits at the LHC

Christian Autermann, Benedikt Mura, Christian Sander, Hannes Schettler, Peter Schleper

摘要:

如果在LHC上发现超对称性,目标将是确定基本理论,其基本参数和超对称粒子的质量。我们在这里遵循的方法来重建的超对称事件的衰变链的假设下,共同的中间质量。由于在R-宇称守恒的情况下无法测量LSP动量,因此不能从每个事件中提取这些质量。但是,如果衰变链足够长,使得有足够的质量约束,则事件的集合可以被过度约束。在这里,我们提出了一种新的方法结合a)超对称质量扫描,b)基于遗传算法的衰变链重建的运动学拟合,和c)使用角衰减信息来抑制来自其他超对称过程的背景。考虑到充分的组合背景和实验分辨率在最困难的情况下,完全强子衰变模式,我们证明,在一个超对称的情况下,这种方法可以用来推导出超对称参数空间的概率图。

英文摘要:

In case of the discovery of supersymmetry at the LHC, the goal will be to identify the underlying theory, its fundamental parameters, and the masses of SUSY particles. We followed here the approach to reconstruct the decay chains in SUSY events under the assumption of common intermediate masses. These masses cannot be extracted from each event because of the unmeasured LSP momenta in case of R-parity conservation. But an ensemble of events can be over-constrained, if the decay chains are long enough, such that enough mass constraints are available. Here, we present a new method combining a) a SUSY mass scan, b) a kinematic fitting based on a genetic algorithm for decay chain reconstruction, and c) the usage of angular decay information to suppress the background from other SUSY processes. Taking into account the full combinatorial background and experimental resolutions in the most difficult case of the fully hadronic decay mode, we demonstrate, within one SUSY scenario, that this method can be used to derive a probability map of the SUSY parameter space.

机构、总结、中文摘要均由AI分析而来,可能存在错误,请以论文正文为准。

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