使用轻微修饰提取短距离顶部体量
Extracting a Short Distance Top Mass with Light Grooming
摘要：
我们提出了一种基于因子分解公式的运动学方法，用于精确测量$pp$碰撞中的顶夸克质量$m_t$。通过使用轻梳理，这是一个数量级的侵略性比典型的梳理，我们保留了一个通用的描述的顶部质量计划和衰减效果，同时仍然有效地去除软污染的顶部射流。我们给出了重顶夸克引起的喷注的强子化修正的场论结果，表明它们是由一个普遍的强子参数描述的，该参数也出现在修饰的轻夸克喷注中。我们的结果的一个重要的唯象应用是，人们可以得到$m_t$在短距离方案通过拟合强子水平喷流质量分布，我们的因式分解公式预测，数据或Monte-Carlo校准。$pp$和$e^+e^-$碰撞的峰值分布是相似的，直到对潜在事件的敏感性，其被软丢弃显著降低。由于软滴意味着$t$和$\bar t$喷流质量可以独立测量，因此分析可以使用轻子+喷流样品。
英文摘要：
We propose a kinematic method based on a factorization formula for precisely measuring the top quark mass $m_t$ in $pp$ collisions using boosted top jets with light soft drop grooming. By using light grooming, which is an order of magnitude less aggressive than typical grooming, we retain a universal description of the top mass scheme and decay effects, while still effectively removing soft contamination from the top jet. We give field theory results for the hadronization corrections for jets induced by a heavy top quark, showing they are described by a universal hadronic parameter that also appears for groomed light quark jets. An important phenomenological application of our results is that one can obtain $m_t$ in a short distance scheme by fitting the hadron level jet mass distributions, predicted by our factorization formula, to data or by Monte-Carlo calibration. The peaked distributions for $pp$ and $e^+e^-$ collisions are similar, up to sensitivity to underlying event which is significantly reduced by soft drop. Since soft drop implies that the $t$ and $\bar t$ jet masses each can be independently measured, the analysis enables the use of lepton+jet samples.
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