AI 中文总结
该研究利用CMS实验数据，通过四轻子衰变通道测量离壳希格斯玻色子。进行复合希格斯玻色子模型测试、胶子融合产生测试等，获得自耦合约束，给出轻夸克汤川耦合最严约束，还得到希格斯玻色子宽度及排除无离壳产生情况等成果。
AI 中文摘要
本文利用四轻子衰变通道给出了离壳区域希格斯玻色子产生的测量结果。使用了欧洲核子研究中心大型强子对撞机质子-质子碰撞数据，由CMS实验收集，质心能量13 TeV，积分亮度138 fb⁻¹。首次对复合希格斯玻色子模型进行直接测试，在95%置信水平下，复合性尺度Λₕ下限设定为870 GeV。在标准模型有效场论框架内对胶子融合产生进行测试，获得离壳区域希格斯玻色子自耦合的首个约束。通过结合壳上和壳下测量，对轻夸克汤川耦合给出最严格约束，放松了如希格斯玻色子与矢量玻色子耦合的限制，提供更独立于模型的结果。考虑一系列超出标准模型的效应，包括胶子融合产生回路中的轻、重粒子以及与矢量玻色子的修正耦合，给出希格斯玻色子宽度的约束。对H→ZZ和PH→WW通道进行联合分析提高对希格斯玻色子宽度的灵敏度，得到Γₕ = 5.1⁺².⁰₋₁.⁸ MeV。排除了无离壳希格斯玻色子产生的情况，置信水平超过5个标准差。
英文摘要
Measurements of Higgs boson production in the off-shell region are presented, using the four-lepton decay channel. Data from proton-proton collisions at the CERN LHC, collected by the CMS experiment and corresponding to an integrated luminosity of 138 fb$^{-1}$ at a center-of-mass energy of 13 TeV, are utilized. The first direct test of composite Higgs boson models is performed, with a lower limit on the compositeness scale $Λ_\mathrm{H}$ set at 870 GeV at the 95% confidence level. Tests of gluon-fusion production within the standard model effective field theory framework are performed. The first constraint on the Higgs boson self-coupling in the off-shell region is obtained. By combining on- and off-shell measurements, the analysis sets the tightest constraints to date on light-quark Yukawa couplings, while relaxing assumptions such as the bound on the Higgs boson coupling to vector bosons, thereby providing more model-independent results. Constraints on the Higgs boson width are provided while accounting for a range of beyond-the-standard-model effects, including both light and heavy particles in the gluon-fusion production loop, as well as modified couplings to vector bosons. A combined analysis of the H$\to$ZZ and PH$\to$WW channels is performed to improve sensitivity to the Higgs boson width, yielding $Γ_\mathrm{H}$ = 5.1$^{+2.0}_{-1.8}$ MeV. The scenario of no off-shell Higgs boson production is excluded at a confidence level exceeding 5 standard deviations.
CommentsThis version has an updated author list. Submitted to Physical Review D. All figures and tables can be found at http://cms-results.web.cern.ch/cms-results/public-results/publications/HIG-25-003 (CMS Public Pages)
