SMEFT框架下缩小与扩大范围的FCC-ee运行场景
Descoped and Upscoped FCC-ee Running Scenarios in the SMEFT
浏览论文内容
中文总结 AI 辅助
该研究在SMEFT框架下，分析了FCC-ee缩小、扩大范围的运行场景对新物理的灵敏度，明确了顶夸克运行对FCC-ee物理潜力的重要性，还探讨了其与（HL）-LHC测量的互补性。
中文摘要 AI 辅助
我们在标准模型有效场论（SMEFT）框架下，给出了缩小与扩大范围的FCC-ee场景对新物理的灵敏度预测。从基线FCC-ee计划出发，我们依次分析了以下操作的后续影响：首先取消顶夸克运行，随后将束流功率从50兆瓦降至30兆瓦，最后取消两个对撞点（IP），所有情况均通过参数不确定性的增加传递顶夸克质量精度的损失。我们还分析了分阶段顶夸克运行的可能性，即若仅在后期获得资金，可部分恢复顶夸克运行。受束流功率与运营成本间权衡的驱动，我们还考虑了两种扩大范围的场景：要么在所有能量运行中均匀提升亮度，要么仅针对顶夸克运行提升亮度。我们探究了每种场景的灵敏度与局限性，并特别强调了FCC-ee预测与（HL）-LHC测量之间的互补性。通过将不同运行场景的物理影响与FCC-ee基线对比，我们明确展示了顶夸克运行的重要性，表明FCC-ee的大部分物理潜力依赖于它。
英文摘要
We present projections for the sensitivity to new physics of descoped and upscoped FCC-ee scenarios in the framework of the Standard Model Effective Field Theory (SMEFT). Starting from the baseline FCC-ee programme, we analyse the subsequent impact of, first, removing the top-quark run, then reducing the beam power from 50 MW to 30 MW, and finally removing two interaction points (IPs), in all cases propagating the resulting loss in top-quark mass precision through increased parametric uncertainties. We also analyse the possibility of a staged top-quark run, where the top-quark run is partially restored in case funding becomes available only at a later stage. Motivated by the trade-off between beam power and operational costs, we also consider two upscoped scenarios, either through a uniform increase in luminosity across all energy runs, or through a luminosity enhancement targeting exclusively the top-quark run. We explore the sensitivity and limitations of each scenario and highlight in particular the complementarity between the FCC-ee projections and the (HL)-LHC measurements. By comparing the physics impact of the different running scenarios with the FCC-ee baseline, we show explicitly the importance of the top-quark run, indicating that a substantial fraction of the FCC-ee physics potential depends on it.
