AI 中文总结
CMS实验利用200 fb⁻¹积分亮度的13、13.6 TeV质子-质子碰撞数据，寻找H→Zγ稀有衰变，测得信号强度μ为1.10⁺⁰·⁵²₋₀·⁶¹，显著性为1.9个标准偏差。
AI 中文摘要
本文介绍了对稀有圈诱导希格斯玻色子衰变H→Zγ的寻找，其中Z衰变到ℓ⁺ℓ⁻，ℓ为电子或μ子。该寻找利用了大型强子对撞机（LHC）上CMS实验记录的质心系能量为13和13.6 TeV的质子-质子（pp）碰撞数据样本，对应总积分亮度为200 fb⁻¹。分析设计分别考虑并优化了对胶子-胶子融合、矢量玻色子融合及伴随产生过程产生希格斯玻色子的灵敏度。通过对各产生道和事件类别中ℓ⁺ℓ⁻γ系统的不变质量分布进行同时拟合来提取信号。在希格斯玻色子质量为125.38 GeV时，观测到的（预期的）信号强度μ定义为测量的产生截面与衰变分支比乘积σ(pp→H)B(H→Zγ)与标准模型预测对应值的比值，结果为μ=1.10⁺⁰·⁵²₋₀·⁶¹（1.00⁺⁰·⁴⁹₋₀·⁴⁶）。该信号的观测（预期）显著性为1.9（2.3）个标准偏差。
英文摘要
A search is presented for the rare, loop-induced Higgs boson decay H $\to$ Z$γ$, where Z $\to$ $\ell^+\ell^-$ and $\ell$ = e or $μ$. The search is performed using a sample of proton-proton (pp) collision data at the center-of-mass energies of 13 and 13.6 TeV, recorded by the CMS experiment at the LHC and corresponding to a total integrated luminosity of 200 fb$^{-1}$. The analysis design separately considers and optimizes sensitivity to Higgs boson production via gluon-gluon fusion, vector boson fusion, and associated-production processes. The signal is extracted from a simultaneous fit to the invariant mass distributions of the $\ell^+\ell^-γ$ system in the various production channels and event categories. The observed (expected) signal strength $μ$, defined as the ratio of the measured product the of cross section and decay branching fraction value $σ$(pp $\to$ H)$\mathcal{B}$(H $\to$ Z$γ$) to the corresponding value predicted in the standard model, is found to be $μ$ = 1.10$^{+0.52}_{-0.61}$ (1.00$^{+0.49}_{-0.46}$) for a Higgs boson mass of 125.38 GeV. The signal has an observed (expected) significance of 1.9 (2.3) standard deviations.
CommentsSubmitted to Physics Letters B. All figures and tables can be found at http://cms-results.web.cern.ch/cms-results/public-results/publications/HIG-25-010 (CMS Public Pages)
