在多TeV缪子对撞机上通过希格斯玻色子对产生测量希格斯自耦合三线性项
Measuring the trilinear Higgs self-coupling in Higgs boson pair production at multi-TeV muon colliders
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中文总结 AI 辅助
该研究评估多TeV缪子对撞机通过希格斯对产生测量κ₃的灵敏度，结合多种方法实现信号提取，10 TeV下测量精度大幅超越HL-LHC预期。
中文摘要 AI 辅助
希格斯自耦合三线性项决定了希格斯势的形状，对其测量是未来对撞机的核心目标。我们评估多TeV缪子对撞机在矢量玻色子融合产生希格斯玻色子对过程中对耦合修饰因子κ₃的灵敏度，采用√s=3 TeV、积分亮度1 ab⁻¹和10 TeV、积分亮度10 ab⁻¹的b̄b b̄b末态数据。对事件在两个互补区域分析：含四喷注的分辨区域和含两大半径喷注的增强区域。为从大几个数量级的本底中提取信号，我们结合基于SPANet方法的有监督喷注-希格斯配对网络、事件能量流的拓扑数据分析，以及两个专用分类器：用于信号-本底分离的D_HH和用于κ₃形状信息的D_κ₃。通过对两个分类器输出分布的二维似然拟合提取耦合值。结合两个区域，在68%置信水平下，3 TeV时得到0.80<κ₃<1.29，10 TeV时得到0.96<κ₃<1.05。该10 TeV下的测量在这一统计受限投影中达到百分之几的精度，大幅超越HL-LHC预期的精度。
英文摘要
The trilinear Higgs self-coupling determines the shape of the Higgs potential, and its measurement is a central goal of future colliders. We assess the sensitivity of multi-TeV muon colliders to the coupling modifier $κ_3$ in Higgs boson pair production via vector boson fusion, using the $b\bar{b}b\bar{b}$ final state at $\sqrt{s}=3$ TeV with $1$ ab$^{-1}$ and at $10$ TeV with $10$ ab$^{-1}$. Events are analyzed in two complementary regions, a resolved region with four jets and a boosted region with two large-radius jets. To extract the signal from backgrounds a few orders of magnitude larger, we combine a supervised jet-to-Higgs pairing network based on the SPANet approach, topological data analysis of the event energy flow, and two dedicated classifiers, $D_{\rm HH}$ for the signal-to-background separation and $D_{κ_3}$ for the $κ_3$ shape information. The coupling is extracted from a two-dimensional likelihood fit to the distribution of the two classifier outputs. Combining the two regions, we obtain $0.80<κ_3<1.29$ at $3$ TeV and $0.96<κ_3<1.05$ at $10$ TeV at $68\%$ confidence level. The $10$ TeV determination reaches the few-percent level in this statistics-limited projection, which surpasses by a large amount the precision projected for the HL-LHC.
