2026-08-20 ミシガン大学
A computer rendering showing a double-Higgs event inside the ATLAS detector, represented by the outer black and gray structures. Image credit: CERN
＜関連情報＞
- https://news.umich.edu/u-m-researchers-use-ai-to-help-set-record-setting-sensitivity-in-search-for-new-physics
- https://arxiv.org/abs/2607.26879
非共鳴ヒッグス粒子対生成の解析の改善bb¯τ+τ−最終状態196 fb−1収集されたデータ√s= 13 TeV および 13.6 TeV (ATLAS検出器使用時)
Improved analysis of non-resonant Higgs boson pair production in the bb¯τ+τ− final state with 196 fb−1 of data collected at √s = 13 TeV and 13.6 TeV with the ATLAS detector
The ATLAS Collaboration
A search for non-resonant Higgs boson pair production (HH) in the bb¯γ+γ– final state is performed using 140fb−1 and 56 fb−1 of proton–proton collision data at centre-of-mass energies of √s= 13 TeV and 13.6 TeV, respectively, recorded by the ATLAS detector during 2015–2023 at the CERN Large Hadron Collider. Relative to the previous ATLAS searches in the same final state, the analysis benefits from the additional dataset collected at 13.6 TeV and from improvements in both event reconstruction and analysis techniques. The Higgs boson pair production cross-section divided by the Standard Model (SM) prediction is found to be μHH= 2.6+1.4−1.0, consistent with the SM expectation. This corresponds to an observed (expected) significance of 2.6 (1.2) standard deviations over the background-only hypothesis of no production and 1.65 standard deviations with respect to the SM prediction. Under the assumption that all other Higgs boson couplings take their SM values, the observed (expected) 95% confidence level interval for the Higgs boson self-coupling modifier is found to be kϒ∈ [−3.4,1.6] ∪ [5.5,10.1] ( kϒ∈ [−1.7,8.5]). As a validation of the analysis strategy, measurements of the and processes are performed in the same final state using the same event selection, yielding observed (expected) significances of 3.5 (2.4) and 1.8 (2.7) standard deviations, respectively, relative to the background-only prediction.
