arXivDaily arXiv每日学术速递 周一至周五更新
arXiv 1908.02179hep-ph
收藏

顶夸克对的不变质量分布和顶夸克质量的确定

Invariant-mass distribution of top-quark pairs and top-quark mass determination

Wan-Li Ju, Guoxing Wang, Xing Wang, Xiaofeng Xu, Yongqi Xu, Li Lin Yang

摘要:

我们研究了顶夸克对在$2m_t$阈值附近的不变质量分布,它对顶夸克质量$m_t$的确定有很大的影响。我们表明,高阶非相对论修正导致大的贡献,这是不包括在国家的最先进的理论预测。我们推导出一个因式分解公式来恢复这样的校正强耦合中的所有订单,并计算必要的成分,以执行下一个领先的权力重申。我们结合的revermation与固定顺序的结果,并提出唯象相关的数值结果。我们发现,再热效应显著增强了阈值区的微分截面,使理论预测与实验数据更加一致。我们估计,在测定$m_t$中使用我们的预测将导致更接近直接测量结果的值。

英文摘要:

We investigate the invariant-mass distribution of top-quark pairs near the $2m_t$ threshold, which has strong impact on the determination of the top-quark mass $m_t$. We show that higher-order non-relativistic corrections lead to large contributions which are not included in the state-of-the-art theoretical predictions. We derive a factorization formula to resum such corrections to all orders in the strong-coupling, and calculate necessary ingredients to perform the resummation at next-to-leading power. We combine the resummation with fixed-order results and present phenomenologically relevant numeric results. We find that the resummation effect significantly enhances the differential cross section in the threshold region, and makes the theoretical prediction more compatible with experimental data. We estimate that using our prediction in the determination of $m_t$ will lead to a value closer to the result of direct measurement.

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。

↑