论文标题
搜索125 GEV Higgs玻色子的腐烂成Z玻色子和$ρ$或$ ϕ $ MESON
Search for decays of the 125 GeV Higgs boson into a Z boson and a $ρ$ or $ϕ$ meson
论文作者
论文摘要
搜索125 GEV Higgs Boson腐烂到Z Boson，以及$ρ^0 $（770）或$ ϕ $（1020）MESON，以搜索使用CMS实验收集的Proton-Proton碰撞数据，该数据在LHC上收集的Proton-Proton碰撞数据，$ \ sqrt {s} = $ 13 tev。分析的数据集对应于137 fb $^{ - 1} $的集成光度。选择了Z玻色子腐烂成一对电子或一对Muons的事件，以及分别为pions和Kaons成对的$ρ$和$ ϕ $ MESON的腐烂。没有观察到高于背景模型的显着多余。由于Z玻色子的衰减产物和$ρ$或$ ϕ $中的衰减产物的不同极化状态可能会影响信号接受度，因此考虑了衰减的纵向或横向极化的场景。希格斯玻色子分支分支为z $ρ$和z $ ϕ $的95％置信度的上限分别为1.04-1.31％和0.31-0.40％，其中范围反映了所考虑的极化场景；这些值是比各自的标准模型期望大的740-940和730-950倍。这些结果构成了两个衰减通道上的第一个实验限制。
Decays of the 125 GeV Higgs boson into a Z boson and a $ρ^0$(770) or $ϕ$(1020) meson are searched for using proton-proton collision data collected by the CMS experiment at the LHC at $\sqrt{s} = $ 13 TeV. The analysed data set corresponds to an integrated luminosity of 137 fb$^{-1}$. Events are selected in which the Z boson decays into a pair of electrons or a pair of muons, and the $ρ$ and $ϕ$ mesons decay into pairs of pions and kaons, respectively. No significant excess above the background model is observed. As different polarization states are possible for the decay products of the Z boson and $ρ$ or $ϕ$ mesons, affecting the signal acceptance, scenarios in which the decays are longitudinally or transversely polarized are considered. Upper limits at the 95% confidence level on the Higgs boson branching fractions into Z$ρ$ and Z$ϕ$ are determined to be 1.04-1.31% and 0.31-0.40%, respectively, where the ranges reflect the considered polarization scenarios; these values are 740-940 and 730-950 times larger than the respective standard model expectations. These results constitute the first experimental limits on the two decay channels.
