AI 中文总结
ATLAS实验利用13TeV、最高140 fb⁻¹的质子-质子碰撞数据，组合测量希格斯玻色子的产生与衰变，得到其耦合修正、自耦合等结果，灵敏度较此前提升35%，并在标准模型有效场论框架下解释测量结果。
AI 中文摘要
本文报告了ATLAS实验利用大型强子对撞机（LHC）在质心系能量√s=13TeV下采集的、积分亮度最高达140 fb⁻¹的质子-质子碰撞数据，对希格斯玻色子的产生与衰变过程进行的组合测量。研究确定了希格斯玻色子的总产生事例率相对于标准模型预测值的比值为0.990⁺⁰.⁰⁵³₋₀.₀₅₁，该比值被分解为统计不确定性（±0.027）、实验不确定性（±0.024）、信号理论不确定性（⁺⁰.⁰³⁷₋₀.₀₃₅）以及本底理论不确定性（⁺⁰.⁰¹⁶₋₀.₀₁₅）四个分量，其中信号理论不确定性占比最大，主要源于量子色动力学（QCD）中缺失的高阶项以及部分子簇射效应的建模。研究还测量了希格斯玻色子的总产生截面和衰变分支比，灵敏度较ATLAS此前的测量结果提升了最高35%，同时给出了各衰变通道的产生截面。对结果的解释围绕希格斯玻色子的耦合修正因子展开：单希格斯玻色子与希格斯玻色子对产生测量的组合，得到希格斯自耦合的修正因子κ_λ=1.3⁺³.¹₋₁.₆，95%置信水平下的区间为[-1.5, 6.5]；利用H→b\bar{b}衰变道的部分宽度，首次通过ATLAS实验在修正最小减除方案下确定了希格斯玻色子质量标度下的b夸克跑动质量，结果为m_b(m_H)=2.73⁺⁰.²⁷₋₀.²⁵ GeV；基于希格斯玻色子在壳与离壳的产生率，测得其总宽度Γ_H=3.6⁺².¹₋₁.⁶ MeV。此外，研究在简化模板截面（Simplified Template Cross-sections）框架下，于44个运动学区域内探究了希格斯玻色子产生的运动学特性，并将结果置于标准模型有效场论（Standard Model Effective Field Theory）模型的框架下进行解释。
英文摘要
This paper presents combined measurements of Higgs boson production and decay using up to 140 fb$^{-1}$ of proton--proton collision data collected by the ATLAS experiment at the LHC at $\sqrt{s} = 13$ TeV. The inclusive Higgs boson event rate relative to its Standard Model prediction is determined to be $0.990 ^{+0.053}_{-0.051} = 0.990 \pm 0.027 \text{ (stat.) } \pm 0.024 \text{ (exp.) } ^{+0.037}_{-0.035} \text{ (sig. theo.) } ^{+0.016}_{-0.015} \text{ (bkg. theo.)}$, separating statistical, experimental, signal-theory and background-theory uncertainty components. The signal theory uncertainty is the largest contribution, dominated by missing higher-order terms in QCD and the modelling of parton shower effects. Inclusive production cross-sections and decay branching ratios are measured, with sensitivities improved by up to 35% relative to the previous ATLAS publication. Production cross-sections for individual decay channels are also reported. The results are interpreted in terms of modifiers to Higgs boson couplings. The combination of single Higgs boson and Higgs boson pair production measurements yields $κ_λ= 1.3^{+3.1}_{-1.6}$ for the modifier to the Higgs boson self-coupling, with an interval of $[-1.5, 6.5]$ at 95% confidence level. The partial width in the $H\to b\bar{b}$ decay channel is used to obtain the first ATLAS determination of the running mass of the $b$-quark at the Higgs boson mass scale in the modified minimal subtraction scheme, found to be $m_b(m_H) = 2.73^{+0.27}_{-0.25}$ GeV. The total width of the Higgs boson is measured to be $Γ_H = 3.6^{+2.1}_{-1.6}$ MeV based on its on- and off-shell production rates. The kinematics of Higgs boson production are probed within the framework of Simplified Template Cross-sections in 44 kinematic regions, and the results are interpreted in the context of Standard Model Effective Field Theory models.
CommentsComments: 118 pages in total, author list starting page 102, 49 figures, 26 tables, submitted to Rep. Prog. Phys. All figures including auxiliary figures are available at http://atlas.web.cern.ch/Atlas/GROUPS/PHYSICS/PAPERS/HIGP-2025-16
