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arXiv 1007.1321hep-ph
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测量超对称性

Measuring Supersymmetry

Dirk Zerwas

摘要:

超对称性是粒子物理学标准模型的一个有吸引力的扩展。它将每一个玻色子自由度与一个费米子自由度联系起来,反之亦然。超对称性统一了电磁力、弱力和强力在高尺度上的耦合常数,并为难以捉摸的暗物质提供了候选者。超对称性可以在大型强子对撞机(LHC)上发现,大型强子对撞机是欧洲核子研究中心的质子-质子对撞机,已于2008年开始运行。预计LHC的质心能量将达到14 TeV,这为ATLAS和CMS实验探索超对称粒子开辟了一个新的质量范围。用于这些探测器的电子器件的开发和生产一直是一个挑战,例如用于电磁量热计的读出板。在广泛的试验束研究和蒙特卡罗模拟中,以最高的精度重建物理事件,特别是重建和识别大QCD背景中的电子和光子。如果希格斯玻色子和超对称性被发现,(s)粒子的性质,如质量,分支比必须被精确测量,无论是在大型强子对撞机还是在未来的e+e-线性对撞机上。SFitter项目旨在从相关的实验测量(包括理论误差)中确定基础理论模型参数。该方法被应用于提取超对称性的基本参数以及在LHC的希格斯玻色子玻色子耦合的测量。超对称参数从弱标度外推到大统一标度可以为引力的包含提供基础。

英文摘要:

Supersymmetry is an attractive extension of the standard model of particle physics. It associates to every bosonic degree of freedom a fermionic one and vice versa. Supersymmetry unifies the coupling constants of the electromagnetic, weak and strong forces at a high scale and provides a candidate for the elusive dark matter. Supersymmetry could be discovered at the LHC, the proton--proton collider at CERN which has started operations in 2008. The LHC is foreseen to have a center--of--mass energy of 14~TeV, opening up a new mass range to be explored to search for supersymmetric particles with the ATLAS and CMS experiments. The development and production of electronics for these detectors has been a challenge, e.g. for the readout board for the electromagnetic calorimeter. Reconstructing the physics events with the best precision, in particular the reconstruction and identification of electrons and photons in the large QCD background has been prepared in extensive test beam studies and Monte Carlo simulations. If the Higgs boson and supersymmetry are discovered, the properties of the (s)particles such as the masses, branching ratios must be measured precisely, either at the LHC or at a future e+e- linear collider. The SFitter project aims to determine the underlying theoretical model parameters from the correlated experimental measurements including theoretical errors. The methods are applied to the extraction of the fundamental parameters of supersymmetry as well the measurement of the Higgs boson couplings at the LHC. The extrapolation of the supersymmetric parameters from the weak scale to the Grand Unification Scale could provide the basis towards the inclusion of gravity.

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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