AI 中文总结
该研究利用CMS探测器在LHC 13和13.6 TeV数据中搜索希格斯玻色子复合性，通过双轻子末态约束斜参数，并在新物理场景下首次探索大宽度Z'共振，设置更严格的复合性限制。
AI 中文摘要
利用CMS探测器在高双电子和双缪子末态中搜索超出标准模型效应的研究，特别关注希格斯玻色子的复合性。该搜索使用LHC在13和13.6 TeV质心能量下收集的数据，对应的总积分亮度为207 fb$^{-1}$。复合性会表现为观测到的双轻子质量谱的畸变以及束缚态的存在，例如希格斯玻色子和新的重矢量玻色子共振态。假设存在质量远高于TeV能标的新玻色子态，有效场论方法对斜参数$\mathcal{W}$和$\mathcal{Y}$提供了严格的约束，这两个参数在标准模型中为零。一维拟合中仅允许一个斜参数偏离零，在95%置信水平下给出以下限制：$-3.9 \times 10^{-4} \lt \mathcal{Y} \lt 3.5 \times 10^{-4}$和$-2.1 \times 10^{-4} \lt \mathcal{W} \lt 1.6 \times 10^{-4}$。在假设新的Z'共振实际存在于可见双轻子质量谱内或略高于该谱的几种新物理场景下，在TeV能标设置了更严格的复合性限制。在此背景下，首次探索了具有大共振衰变宽度的情况。
英文摘要
A search for beyond the standard model effects in high-mass dielectron and dimuon final states with the CMS detector is performed, with a specific focus on Higgs boson compositeness. The search uses data collected at the LHC at 13 and 13.6 TeV center-of-mass energies, corresponding to a total integrated luminosity of 207 fb$^{-1}$. Compositeness would manifest as distortions in the observed dilepton mass spectrum and the presence of bound states, such as the Higgs boson and new massive vector boson resonances. Assuming the existence of new boson states with masses well above the TeV scale, an effective field theory approach provides stringent bounds on the oblique parameters $\mathcal{W}$ and $\mathcal{Y}$, which are zero in the standard model. One-dimensional fits, in which only one of the oblique parameters is allowed to deviate from zero, provide the following limits: $-$3.9 $\times$ 10$^{-4}$$\lt$ $\mathcal{Y}$ $\lt$ 3.5 $\times$ 10$^{-4}$ and $-$2.1 $\times$ 10$^{-4}$ $\lt$ $\mathcal{W}$ $\lt$ 1.6 $\times$ 10$^{-4}$ at 95% confidence level. More stringent compositeness limits at the TeV scale are set in several new physics scenarios under the assumption that a new Z' resonance is physically present within or slightly above the visible dilepton mass spectrum. In this context, cases with large resonance decay widths are explored for the first time.
CommentsSubmitted to the Journal of High Energy Physics. All figures and tables can be found at http://cms-results.web.cern.ch/cms-results/public-results/publications/EXO-25-001 (CMS Public Pages)
