论文标题
$ t \ bar {t} $ threshold的顶级夸克质量测量
Top quark mass measurements at the $t\bar{t}$ threshold with CEPC
论文作者
论文摘要
我们在基于CEPC的$ t \ bar {t} $阈值上对顶级夸克质量测量结果进行了研究。使用$ t \ bar {t} $生产率评估了最高质量质量两次的质量能量扫描，并评估了顶部夸克质量，宽度和$α_s$的测量精度。讨论了阈值处的现实扫描策略，以最大程度地提高对顶级夸克属性的敏感性，同时在CEPC方案中同时且总体亮度有限为100 fb $^{ - 1} $。通过对单个物业测量值进行最佳扫描，预计最高的夸克质量精度为9 MeV，预计最高的夸克宽度精度为26 meV，并且可以以0.00039的精度测量$α_s$。考虑到理论，背景减法，梁能量和发光度谱系的不确定性，可以精确地测量顶部夸克质量，以14 MeV的速度为14 MeV，在CEPC上保守34 MEV。
We present a study of top quark mass measurements at the $t\bar{t}$ threshold based on CEPC. A centre-of-mass energy scan near two times of the top mass is performed and the measurement precision of top quark mass, width and $α_S$ are evaluated using the $t\bar{t}$ production rates. Realistic scan strategies at the threshold are discussed to maximise the sensitivity to the measurement of the top quark properties individually and simultaneously in the CEPC scenarios assuming a limited total luminosity of 100 fb$^{-1}$. With the optimal scan for individual property measurements, the top quark mass precision is expected to be 9 MeV, the top quark width precision is expected to be 26 MeV, and $α_S$ can be measured at a precision of 0.00039. Taking into account the uncertainties from theory, background subtraction, beam energy and luminosity spectrum, the top quark mass can be measured at a precision of 14 MeV optimistically and 34 MeV conservatively at CEPC.
