由ATLAS和CMS实验在sqrt[s]=7和8TeV时收集的数据对顶夸克质量的测量组合

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Updated: Jun 21, 2025

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Setting Limits on Supersymmetry Using Simplified Models

Published on: November 15, 2013

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A Hayrapetyan¹, A Tumasyan¹, W Adam²

¹Yerevan Physics Institute, Yerevan, Armenia.

Physical review letters

|July 12, 2024

概括

这项研究结合了来自大型强子对撞机 (LHC) 的ATLAS和CMS实验的15个顶级夸克质量测量结果. 结合的结果产生了更精确的顶夸克质量,这对于标准模型精度测试至关重要.

科学领域:

粒子物理学粒子物理学
高能物理高能物理
粒子物理学的标准模型

背景情况:

顶夸克是标准模型中的基本粒子,它的质量是一个关键参数.
对顶夸克质量的精确测量对于测试标准模型的一致性至关重要.
以前的ATLAS和CMS实验的测量提供了顶级夸克质量的有价值但独立的确定.

研究的目的:

将来自ATLAS和CMS实验的15个个别顶夸克质量测量结果结合起来.
通过利用更大的数据集并考虑相关性,实现更精确地确定顶夸克质量.
为了提高顶部夸克质量的精度,超出任何单一贡献测量的精度.

主要方法:

结合了来自ATLAS和CMS的十五个顶夸克质量测量结果.
使用质子对质子碰撞数据,质量中心能量为7 TeV和8 TeV,集成光度高达5和20 fb^{-1}.
包括顶部夸克对产生的测量 (半子和子衰变) 和单个顶部夸克产生的测量 (电弱t通道).

主要成果:

结合的顶部夸克质量被确定为m_{t}=172.52±0.14(stat) ±0.30(syst) GeV.
综合测量的总不确定性为0.33 GeV.
与最精确的个人输入测量相比,总不确定性提高了31%.

结论:

综合分析提供了迄今为止最精确的顶级夸克质量的测量.
顶夸克质量的这个精确值为理论计算和寻找新物理学提供了严格的约束.
结合策略通过结合各种测量技术和大型数据集,有效地减少不确定性.

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