论文标题
直接限制了Higgs-Charm耦合，从搜索Higgs Boson腐烂到具有Atlas检测器的魅力夸克
Direct constraint on the Higgs-charm coupling from a search for Higgs boson decays into charm quarks with the ATLAS detector
论文作者
论文摘要
提出了将希格斯玻色子腐烂成一对魅力夸克的搜索。该分析使用Proton-Proton碰撞来针对Higgs Boson的生产，并与衰减的$ W $或$ Z $ Boson联合使用。 LHC以$ \ sqrt {s} = 13 $ tev的质量中心能量传递的数据集并由地图集检测器记录的数据集对应于139 fb $^{ - 1} $的集成光度。使用标签算法来识别源自Charm Quarks强调的喷气机。分析方法通过同时测量$ ww，wz $和$ zz $的产量进行验证，并观察到（预期）$ 2.6 $（$ 2.2 $）的标准偏差，高于$（w/z）z（\ to c \ bar {c}）的$（w/z）$ 3.8 $ 3.8 $（$ 4.6 $）$（$ 4.6 $）的标准偏差（$） 过程。 $（w/z）h（\ to c \ bar {c}）$搜索产生的（预期的）上限为$ 26 $（$ 31 $）乘以预测的标准型号横截面时间分支分支的higgs玻色子分数，其质量为125 GEV，质量为125 GEV，对应于and and an chnm yukawa couififring modififring coupling coupling coupling coupling coupling modifring coupling coupling | | | | | | <8.5（12.4）$，在95％的置信度下。 A combination with the ATLAS $(W/Z)H, H\to b\bar{b}$ analysis is performed, allowing the ratio $κ_c / κ_b$ to be constrained to less than 4.5 at the 95% confidence level, smaller than the ratio of the $b$- and $c$-quark masses, and therefore determines the Higgs-charm coupling to be weaker than the Higgs-bottom耦合在95％的置信度水平。
A search for the Higgs boson decaying into a pair of charm quarks is presented. The analysis uses proton-proton collisions to target the production of a Higgs boson in association with a leptonically decaying $W$ or $Z$ boson. The dataset delivered by the LHC at a centre-of-mass energy of $\sqrt{s}=13$ TeV and recorded by the ATLAS detector corresponds to an integrated luminosity of 139 fb$^{-1}$. Flavour-tagging algorithms are used to identify jets originating from the hadronisation of charm quarks. The analysis method is validated with the simultaneous measurement of $WW,WZ$ and $ZZ$ production, with observed (expected) significances of $2.6$ ($2.2$) standard deviations above the background-only prediction for the $(W/Z)Z(\to c\bar{c})$ process and $3.8$ ($4.6$) standard deviations for the $(W/Z)W(\to cq)$ process. The $(W/Z)H(\to c \bar{c})$ search yields an observed (expected) upper limit of $26$ ($31$) times the predicted Standard Model cross-section times branching fraction for a Higgs boson with a mass of 125 GeV, corresponding to an observed (expected) constraint on the charm Yukawa coupling modifier $|κ_c| < 8.5 (12.4)$, at the 95% confidence level. A combination with the ATLAS $(W/Z)H, H\to b\bar{b}$ analysis is performed, allowing the ratio $κ_c / κ_b$ to be constrained to less than 4.5 at the 95% confidence level, smaller than the ratio of the $b$- and $c$-quark masses, and therefore determines the Higgs-charm coupling to be weaker than the Higgs-bottom coupling at the 95% confidence level.
