AI 中文总结
利用CMS实验记录的质心能量√s = 13 TeV、积分亮度138 fb⁻¹的质子-质子碰撞数据，寻找末态有六个底夸克的非共振三希格斯玻色子产生，设定了信号截面上限并对耦合修饰符给出限制。
AI 中文摘要
使用CMS实验记录的质心能量√s = 13 TeV、对应积分亮度138 fb⁻¹的质子-质子碰撞数据，开展末态有六个底夸克的非共振三希格斯玻色子（HHH）产生的搜寻。未发现显著超出背景预测的事件。给出了信号截面的95%置信水平上限及对三线性耦合修饰符κ₃、四次耦合修饰符κ₄的限制。
英文摘要
A search for nonresonant triple Higgs boson (HHH) production in the final state with six bottom quarks is performed using proton-proton collisions at $\sqrt{s}$ = 13 TeV corresponding to an integrated luminosity of 138 fb$^{-1}$ recorded by the CMS experiment. No significant excess of events over the background prediction is seen. Observed (expected) 95% confidence level upper limits on the signal cross section are set at 44 (43) fb, corresponding to 588 (572) times the standard model expectation. The observed (expected) constraint on the trilinear coupling modifier $κ_3$ is $-$7.4 $\lt$ $κ_3$ $\lt$ 12.4 ($-$6.4 $\lt$ κ_3 $\lt$ 11.2), assuming the quartic coupling modifier $κ_4$ = 1. The corresponding constraint on $κ_4$ is $-$177 $\lt$ $κ_4$ $\lt$ 185 ($-$180 $\lt$ $κ_4$ $\lt$ 190), assuming $κ_3$ = 1. This analysis provides the most stringent constraint to date on nonresonant HHH production and excludes, for the first time, part of the $(κ_3,κ_4)$ space allowed by the perturbative unitarity bound.
CommentsThis version has an updated author list. Submitted to Physical Review Letters. All figures and tables can be found at http://cms-results.web.cern.ch/cms-results/public-results/publications/HIG-24-012 (CMS Public Pages)
