AI 中文总结
ATLAS探测器结合13 TeV与13.6 TeV的质子-质子碰撞数据，寻找高质量自旋1的ee、μμ共振态，未发现显著偏差，给出相关上限，提取了Z'模型的最严格质量限。
AI 中文摘要
本文提出对高质量范围内自旋为1的电子对（ee）和μ子对（μμ）共振态的寻找研究，利用了欧洲核子中心（CERN）大型强子对撞机（LHC）上ATLAS探测器记录的两组质子-质子碰撞数据集。首先使用2022至2024年间质心系能量为13.6 TeV的数据集开展寻找，对应积分亮度为165 fb⁻¹；随后将该寻找结果与2015至2018年间质心系能量为13 TeV、对应积分亮度为140 fb⁻¹的数据结果进行统计组合。通过函数形式拟合双轻子不变质量谱，以建模标准模型（Standard Model）本底过程的贡献，采用通用自旋1信号形状确定观测结果与本底预期的偏差显著性。未观测到显著偏差，因此在95%置信水平下，针对自旋1共振态，按不同宽度假设、分别针对ee、μμ末态及其组合，设定了 fiducial 截面乘以分支比的上限。从13 TeV与13.6 TeV的组合结果中，提取了各类基准模型玻色子的质量限，包括Z'_SSM（5.5 TeV）、Z'_χ（5.1 TeV）和Z'_ψ（4.8 TeV）。这些结果构成了迄今针对所考虑的Z'模型高质量双轻子共振态的最严格限制。
英文摘要
A search for spin-1 $ee$ and $μμ$ resonances in the high-mass range is presented. Two proton-proton ($pp$) collision datasets recorded by the ATLAS detector at CERN's Large Hadron Collider are utilised. A search is first performed using a dataset recorded at a center-of-mass energy of 13.6 TeV between 2022 and 2024, corresponding to an integrated luminosity of 165 fb$^{-1}$. The results of this search are subsequently statistically combined with results using 140 fb$^{-1}$ of data recorded between 2015 and 2018 at 13 TeV. The dilepton invariant mass spectrum is fitted with a functional form to model the contribution from Standard Model background processes. A generic spin-1 signal shape is used to determine the significance of observed deviations from the background expectation. No significant deviation is observed, therefore upper limits are placed at the 95% confidence level on the fiducial cross-section times branching ratio for a spin-1 resonance with various width hypotheses, individually for $ee$, $μμ$ final states and for their combination. From the combined 13 TeV and 13.6 TeV results, mass limits are extracted for various benchmark model bosons, including a $Z^{\prime}_{\text{SSM}}$ (5.5 TeV), $Z^{\prime}_χ$ (5.1 TeV) and $Z^{\prime}_ψ$ (4.8 TeV). These results represent the most stringent limits to date on high-mass dilepton resonances on the considered $Z'$ models.
Comments38 pages in total, author list starting page 21, 4 figures, 3 tables, submitted to PLB. All figures including auxiliary figures are available at https://atlas.web.cern.ch/Atlas/GROUPS/PHYSICS/PAPERS/EXOT-2025-09
