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arXiv 1611.03399hep-exhep-ph
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理论不确定性对未来e+e对撞机阈值扫描顶夸克质量精度的影响

Impact of Theory Uncertainties on the Precision of the Top Quark Mass in a Threshold Scan at Future e+e- Colliders

Frank Simon

摘要:

未来的能量前沿正负电子对撞机将能够高精度地研究顶夸克的性质。在理论上定义良好的方案中,测量阈值附近的顶对产生截面提供了对顶夸克质量的访问,统计不确定性为20 MeV或更小,这取决于测量的假设积分亮度。在这种精确程度上,实验和理论系统学很可能变得重要,甚至占主导地位。这一贡献提出了第一个分析的影响,最近完成的计算的顶部对生产截面在NNNLO QCD包括交换希格斯玻色子上提取的顶夸克质量的阈值扫描剩余的不确定性。分析是基于重建效率和背景水平,在充分的模拟研究CLIC,结合信号截面从高阶计算。为了评估不同对撞机选项之间可能存在的差异,通过考虑光度光谱的差异,在CLIC,ILC和FCC-ee的背景下进行研究。

英文摘要:

Future energy-frontier electron-positron colliders will be capable of high-precision studies of top quark properties. The measurement of the top-pair production cross section around the threshold provides access to the mass of the top quark in theoretically well-defined schemes, with statistical uncertainties of 20 MeV or less, depending on the assumed integrated luminosity of the measurement. At this level of precision, experimental and theory systematics are likely to become important or even dominant. This contribution presents a first analysis of the impact of the remaining uncertainties of the recently completed calculation of the top pair production cross section at NNNLO QCD including the exchange of Higgs bosons on the extraction of the top quark mass from a threshold scan. The analysis is based on reconstruction efficiencies and background levels obtained in full simulation studies for CLIC, combined with signal cross sections from the higher-order calculations. To assess possible differences between different collider options, the study is performed in the context of CLIC, ILC and FCC-ee by considering the differences in the luminosity spectra.

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