利用 ATLAS 实验对强子衰变τ轻子对末态中高洛伦兹 boost 希格斯玻色子产生的截面测量
Cross-section measurements of boosted Higgs boson production in final states with pairs of hadronically decaying $τ$-leptons with the ATLAS experiment
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中文总结 AI 辅助
利用 ATLAS 实验数据，通过专门技术重建小间距τ轻子对，将 H→ττ测量灵敏度扩展到希格斯玻色子横向动量高于 300 GeV，给出包含性和微分截面结果，为双τ末态 boost 区域希格斯玻色子产生提供证据。
中文摘要 AI 辅助
本文展示了在强子衰变τ轻子对末态中高洛伦兹 boost 希格斯玻色子产生的截面测量。分析基于质心能量√s = 13 TeV 的质子 - 质子碰撞的完整 Run 2 数据样本（对应积分亮度 140 fb⁻¹）以及 2022 - 2024 年用 ATLAS 实验收集的√s = 13.6 TeV、积分亮度 162 fb⁻¹ 的部分 Run 3 数据样本。通过在大半径喷注中重建小间距产生的τ轻子对，将先前 H→ττ测量的灵敏度扩展到希格斯玻色子横向动量高于 300 GeV 的情况。强子τ轻子的标准重建在此相空间效率有限，需要专门的 boost 双τ重建和识别技术，并结合多变量分析方法来提取信号。对于希格斯玻色子横向动量高于 300 GeV 的情况，给出了包含性和微分截面的结果。在简化模板截面框架内，提供了胶子 - 胶子融合产生的希格斯玻色子横向动量的微分截面测量以及矢量玻色子融合产生的包含性截面测量。对于包含性测量，分析在仅背景假设下产生了 3.8（3.3）标准偏差的观测（预期）显著性，为双τ末态 boost 区域中希格斯玻色子的产生提供了证据。
英文摘要
Cross section measurements of high-Lorentz boosted Higgs boson production in final states with pairs of hadronically decaying $τ$-leptons are presented. The analysis is based on the full Run 2 data sample of proton-proton collisions at a centre-of-mass energy of $\sqrt{s} = 13$ TeV, corresponding to an integrated luminosity of 140 $\mathrm{fb}^{-1}$, and a partial Run 3 data sample at $\sqrt{s} = 13.6$ TeV with an integrated luminosity of 162 $\mathrm{fb}^{-1}$ collected in 2022-2024 with the ATLAS experiment. The analysis extends the sensitivity of previous $H \to ττ$ measurements to Higgs boson transverse momenta above 300 GeV by reconstructing $τ$-lepton pairs produced with a small separation in large radius jets. The standard reconstruction of hadronic $τ$-leptons has limited efficiency in this phase space, requiring dedicated boosted di-$τ$ reconstruction and identification techniques, combined with multivariate analysis methods, to extract the signal. For Higgs boson transverse momenta above 300 GeV, results are presented for both inclusive and differential cross-sections. Within the simplified template cross-section framework, differential cross-section measurements in Higgs boson transverse momentum for gluon-gluon fusion production are provided, together with an inclusive cross-section measurement for vector-boson fusion production. For the inclusive measurement, the analysis yields an observed (expected) significance of 3.8 (3.3) standard deviations over the background-only hypothesis, providing evidence of Higgs boson production in the boosted regime of the di-$τ$ final state.
