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arXiv 2403.01313hep-ex
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CMS实验中顶夸克质量测量的综述

Review of top quark mass measurements in CMS

CMS Collaboration

AI总结:

本文综述了CMS合作组在7、8和13 TeV能区开展的顶夸克质量直接与间接测量方法,并介绍了利用洛伦兹boosted顶夸克的新测量途径及其理论解释前景。

摘要:

顶夸克质量是标准模型(SM)中最引人注目的参数之一。其数值表明汤川耦合接近1,由此与希格斯物理产生的紧密联系使顶夸克质量成为理解标准模型电弱部分核心问题的关键要素。本综述首次全面概述了CMS合作组在质心能量为7、8和13 TeV下收集的数据所开展的顶夸克质量测量。此外,文中详细描述了顶夸克事例重建方法,并讨论了信号过程建模中主要不确定度的专门研究。将顶夸克质量的实验测量结果解释为标准模型拉格朗日量参数具有挑战性,这也是理论界持续讨论的焦点。CMS合作组开展了两种主要类型的顶夸克质量测量,从不同角度应对这一挑战:高精度的“直接”测量,基于重建的顶夸克衰变产物并完全依赖蒙特卡罗模拟;以及“间接”测量,利用模拟确定部分子级截面,并与固定阶微扰计算进行比较。近期利用洛伦兹boosted顶夸克进行的质量提取开辟了新的测量途径,该途径基于包含在单个粒子喷注中的顶夸克衰变产物,为精确的理论解释提供了良好前景。

英文摘要:

The top quark mass is one of the most intriguing parameters of the standard model (SM). Its value indicates a Yukawa coupling close to unity, and the resulting strong ties to Higgs physics make the top quark mass a crucial ingredient for understanding essential aspects of the electroweak sector of the SM. This review offers the first comprehensive overview of the top quark mass measurements performed by the CMS Collaboration using the data collected at centre-of-mass energies of 7, 8, and 13 TeV. Moreover, a detailed description of the top quark event reconstruction is provided and dedicated studies of the dominant uncertainties in the modelling of the signal processes are discussed. The interpretation of the experimental results on the top quark mass in terms of the SM Lagrangian parameter is challenging and is a focus of an ongoing discussion in the theory community. The CMS Collaboration has performed two main types of top quark mass measurements, addressing this challenge from different perspectives: highly precise `direct' measurements, based on reconstructed top quark decay products and relying exclusively on Monte-Carlo simulations, as well as `indirect' measurements, where the simulations are employed to determine parton-level cross sections that are compared to fixed-order perturbative calculations. Recent mass extractions using Lorentz-boosted top quarks open a new avenue of measurements based on top quark decay products contained in a single particle jet, with promising prospects for accurate theoretical interpretations.

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。

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