论文标题
在$ \ sqrt {s} $ = 13 TEV中搜索Higgs Boson腐烂到Proton-Proton碰撞中的魅力Quark-Antiquark对
Search for Higgs boson decay to a charm quark-antiquark pair in proton-proton collisions at $\sqrt{s}$ = 13 TeV
论文作者
论文摘要
搜索标准型号的higgs玻色子腐烂到魅力夸克 - 易药对，h $ \ to $ \ $ \ mathrm {c \ bar {c}} $，与leptonically腐烂的V（W或z）玻色子结合而产生。该搜索是用$ \ sqrt {s} $ = 13 TEV的质子 - 普罗顿碰撞执行的，与CMS实验收集的13 tev，对应于138 fb $^{ - 1} $的集成光度。采用了使用机器学习技术的新型魅力喷气识别和分析方法。通过在VZ事件中搜索Z $ \至$ $ \ MATHRM {C \ BAR {C}} $的Z $ \至$ \ Mathrm {C \ bar {c}} $来验证分析，从而导致其在强子对撞机上的首次观察，其显着性为5.7标准偏差。观察到的（预期的）上限$σ$（VH）$ \ MATHCAL {B} $（H $ \ to $ \ $ \ MATHRM {C \ BAR {C}} $）为0.94（0.50 $^{+0.22} _ {+0.22} _ { - 0.15} $ { - 0.15} $ at 95％信心级别（14） $^{+3.4} _ { - 2.3} $）乘以标准模型预测。对于Higgs-Charm Yukawa耦合修饰符，$κ__\ MATHRM {C} $，观察到的（预期）95％Cl间隔为1.1 $ \ lt $ $ $ \ $ \Vertκ_\vertκ_\ Mathrm {C} 3.4），日期最严格的约束。
A search for the standard model Higgs boson decaying to a charm quark-antiquark pair, H $\to$ $\mathrm{c\bar{c}}$, produced in association with a leptonically decaying V (W or Z) boson is presented. The search is performed with proton-proton collisions at $\sqrt{s}$ = 13 TeV collected by the CMS experiment, corresponding to an integrated luminosity of 138 fb$^{-1}$. Novel charm jet identification and analysis methods using machine learning techniques are employed. The analysis is validated by searching for Z $\to$ $\mathrm{c\bar{c}}$ in VZ events, leading to its first observation at a hadron collider with a significance of 5.7 standard deviations. The observed (expected) upper limit on $σ$(VH)$ \mathcal{B}$(H $\to$ $\mathrm{c\bar{c}}$) is 0.94 (0.50 $^{+0.22}_{-0.15}$) pb at 95% confidence level (CL), corresponding to 14 (7.6 $^{+3.4}_{-2.3}$) times the standard model prediction. For the Higgs-charm Yukawa coupling modifier, $κ_\mathrm{c}$, the observed (expected) 95% CL interval is 1.1 $\lt$ $\vertκ_\mathrm{C}\vert$ $\lt$ 5.5 ($\vertκ_\mathrm{c}\vert$ $\lt$ 3.4), the most stringent constraint to date.
