论文标题
在$ \ sqrt {s} $ = 13 tev中，搜索Higgs玻色子腐烂到Z玻色子和Proton-Proton碰撞中的光子
Search for Higgs boson decays to a Z boson and a photon in proton-proton collisions at $\sqrt{s}$ = 13 TeV
论文作者
论文摘要
从搜索Higgs玻色子衰变H $ \至$ z $γ$，其中z $ \ to $ \ ell^+el^+el^ - $带有$ \ ell $ = e或$μ$。搜索是使用质子 - 蛋白质（PP）碰撞数据的样品在13 TEV的质量中心能量中进行的，由CMS实验在LHC上记录，对应于138 fb $^{ - 1} $的集成光度。事件被分配给相互排斥的类别，这些类别利用了事件拓扑的差异和不同HIGGS生产机制的运动学差异，以增强信号灵敏度。信号强度$ $ $，被定义为横截面的产物和分支分数[$σ（$ PP $ \ to $ h $）\ Mathcal {b}（$ h $ \ to $ z $γ$），相对于标准模型预测，从同时提取的标准模型预测中提取了$ \ ell^+eell^+eell^ - eell^ - eell^ - eell^ - eell^-γ- Higgs玻色子质量为125.38 GEV的2.4 $ \ pm $ 0.9。观察到的事件过剩的统计显着性是2.7标准偏差。此测量对应于$σ（$ pp $ \ to $ h $）\ MATHCAL {B}（$ H $ \ to $ z $γ）$ = 0.21 $ \ pm $ 0.08 pb。 $μ$ $ $的95％置信度的观察到的（预期）上限为4.1（1.8）。 The ratio of branching fractions $\mathcal{B}($H $\to$ Z$γ) / \mathcal{B}($H $\to$ $γγ)$ is measured to be 1.5 $^{+0.7}_{-0.6}$, which agrees with the standard model prediction of 0.69 $\pm$ 0.04 at the 1.5 standard deviation level.
Results are presented from a search for the Higgs boson decay H $\to$ Z$γ$, where Z $\to$ $\ell^+\ell^-$ with $\ell$ = e or $μ$. The search is performed using a sample of proton-proton (pp) collision data at a center-of-mass energy of 13 TeV, recorded by the CMS experiment at the LHC, corresponding to an integrated luminosity of 138 fb$^{-1}$. Events are assigned to mutually exclusive categories, which exploit differences in both event topology and kinematics of distinct Higgs production mechanisms to enhance signal sensitivity. The signal strength $μ$, defined as the product of the cross section and the branching fraction [$σ($pp $\to$ H$)\mathcal{B}($H $\to$ Z$γ)$] relative to the standard model prediction, is extracted from a simultaneous fit to the $\ell^+\ell^-γ$ invariant mass distributions in all categories and is found to be $μ$ = 2.4 $\pm$ 0.9 for a Higgs boson mass of 125.38 GeV. The statistical significance of the observed excess of events is 2.7 standard deviations. This measurement corresponds to $σ($pp $\to$ H$)\mathcal{B}($H $\to$ Z$γ)$ = 0.21 $\pm$ 0.08 pb. The observed (expected) upper limit at 95% confidence level on $μ$ is 4.1 (1.8). The ratio of branching fractions $\mathcal{B}($H $\to$ Z$γ) / \mathcal{B}($H $\to$ $γγ)$ is measured to be 1.5 $^{+0.7}_{-0.6}$, which agrees with the standard model prediction of 0.69 $\pm$ 0.04 at the 1.5 standard deviation level.
