H *→…中离壳希格斯玻色子产生的测量

IF 19 1区物理与天体物理 Q1 PHYSICS, MULTIDISCIPLINARY

Reports on Progress in Physics Pub Date : 2025-05-14 DOI:10.1088/1361-6633/adcd9a

The ATLAS Collaboration

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引用次数: 0

摘要

提出了一种在衰变通道中测量离壳希格斯玻色子产生的方法。该测量使用了大型强子对撞机ATLAS探测器在TeV下收集的140 fb−1的质子-质子碰撞，并取代了使用相同数据集在该衰变通道中的先前结果。数据分析使用基于神经模拟的推理方法进行，该方法使用神经网络构建每个事件的似然比。在68% CL的衰变通道中观测到的（预期的）离壳希格斯玻色子产生信号强度为（）。利用衰变通道产生离壳希格斯玻色子的证据的观测（预期）显著性为2.5σ (1.3σ)。与之前对相同数据集的分析相比，预期结果有了显著改善，预期显著性为0.5σ。当与最新的ATLAS在衰变通道中的测量相结合时，离壳希格斯玻色子产生的证据的观测（预期）显著性为3.7σ (2.4σ)。将脱壳测量与上壳希格斯玻色子产生的测量相结合，得到希格斯玻色子总宽度的约束条件。在68% CL处，希格斯玻色子宽度的观测值（预期值）为（）MeV。

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Measurement of off-shell Higgs boson production in the H ∗ →...

A measurement of off-shell Higgs boson production in the decay channel is presented. The measurement uses 140 fb−1 of proton–proton collisions at TeV collected by the ATLAS detector at the Large Hadron Collider and supersedes the previous result in this decay channel using the same dataset. The data analysis is performed using a neural simulation-based inference method, which builds per-event likelihood ratios using neural networks. The observed (expected) off-shell Higgs boson production signal strength in the decay channel at 68% CL is ( ). The evidence for off-shell Higgs boson production using the decay channel has an observed (expected) significance of 2.5σ (1.3σ). The expected result represents a significant improvement relative to that of the previous analysis of the same dataset, which obtained an expected significance of 0.5σ. When combined with the most recent ATLAS measurement in the decay channel, the evidence for off-shell Higgs boson production has an observed (expected) significance of 3.7σ (2.4σ). The off-shell measurements are combined with the measurement of on-shell Higgs boson production to obtain constraints on the Higgs boson total width. The observed (expected) value of the Higgs boson width at 68% CL is ( ) MeV.

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来源期刊

Reports on Progress in Physics 物理-物理：综合

CiteScore

31.90

自引率

0.00%

发文量

审稿时长

6-12 weeks

期刊介绍： Reports on Progress in Physics is a highly selective journal with a mission to publish ground-breaking new research and authoritative invited reviews of the highest quality and significance across all areas of physics and related areas. Articles must be essential reading for specialists, and likely to be of broader multidisciplinary interest with the expectation for long-term scientific impact and influence on the current state and/or future direction of a field.