用遗传算法优化CLIC的顶夸克阈值扫描
Optimising top-quark threshold scan at CLIC using genetic algorithm
摘要：
未来$e^+e^-$对撞机的重要目标之一是在对产生阈值的扫描中测量顶夸克的质量和宽度。然而，在阈值处的成对产生截面的形状还取决于其他模型参数，如顶部汤川耦合，并且测量受到许多系统不确定性的影响。本文研究了CLIC阈扫描测量顶夸克质量的方法。最一般的方法是使用所有相关的模型参数和选定的系统不确定性包括在拟合过程中。其他测量的预期限制也被考虑在内。它表明，顶夸克质量可以提取的精度为30至40兆电子伏的顺序，包括考虑系统的不确定性，已经为100 FB $^{-1}$的数据收集在阈值。如果运行场景得到优化，还可以进行其他改进。基于遗传算法的优化过程的质量测量的统计不确定度可以减少约20%。还研究了对撞机光度谱对测量精度的影响。
英文摘要：
One of the important goals at the future $e^+e^-$ colliders is to measure the top-quark mass and width in a scan of the pair production threshold. However, the shape of the pair-production cross section at the threshold depends also on other model parameters, as the top Yukawa coupling, and the measurement is a subject to many systematic uncertainties. Presented in this work is the study of the top-quark mass determination from the threshold scan at CLIC. The most general approach is used with all relevant model parameters and selected systematic uncertainties included in the fit procedure. Expected constraints from other measurements are also taken into account. It is demonstrated that the top-quark mass can be extracted with precision of the order of 30 to 40 MeV, including considered systematic uncertainties, already for 100 fb$^{-1}$ of data collected at the threshold. Additional improvement is possible, if the running scenario is optimised. With the optimisation procedure based on the genetic algorithm the statistical uncertainty of the mass measurement can be reduced by about 20%. Influence of the collider luminosity spectra on the expected precision of the measurement is also studied.
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