arXiv 2201.114282022-01hep-ex

用ATLAS探测器寻找希格斯玻色子衰变为粲夸克对Higgs-粲耦合的直接约束

Direct constraint on the Higgs-charm coupling from a search for Higgs boson decays into charm quarks with the ATLAS detector

ATLAS Collaboration

备注：: 58 pages in total, author list starting page 43, 17 figures, 5 tables, published in EPJC. All figures including auxiliary figures are available at http://atlas.web.cern.ch/Atlas/GROUPS/PHYSICS/PAPERS/HIGG-2021-12
发表信息：: Eur. Phys. J. C 82 (2022) 717
DOI：: 10.1140/epjc/s10052-022-10588-3

阅读 PDF

arXiv 页面 ↗HTML 原文 ↗

摘要：

寻找衰变为一对粲夸克的希格斯玻色子玻色子。该分析使用质子-质子碰撞来靶向与轻子衰变的$W$或$Z$玻色子相关的希格斯玻色子的产生。由大型强子对撞机以$\sqrt{s}=13$ TeV的质心能量提供并由ATLAS探测器记录的数据集对应于139 fb $^{-1}$的积分光度。味标记算法被用来识别喷流起源于强子化的魅力夸克。通过同时测量$WW,WZ$和$ZZ$产量，对分析方法进行了验证，对于$(W/Z)Z(\to c\bar{c})$工艺，$2.6$（$2.2$）标准偏差的观察（预期）显著性高于仅背景预测值，对于$(W/Z)W(\to cq)$工艺，$3.8$（$4.6$）标准偏差显著性高于仅背景预测值。$(W/Z)H(\to c \bar{c})$搜索产生了一个观测到的（预期的）$26$（$31$）上限乘以预测的标准模型横截面乘以质量为125 GeV的希格斯玻色子的分支分数，对应于在95%置信水平下观测到的（预期的）对粲汤川耦合修饰符$|κ_c| < 8.5 (12.4)$的约束。结合ATLAS $(W/Z)H, H\to b\bar{b}$分析，在95%的置信水平下，将比值$κ_c / κ_b$限制为小于4.5，小于$b$ -和$c$ -夸克质量的比值，因此确定Higgs-charm耦合在95%的置信水平下弱于Higgs-bottom耦合。

英文摘要：

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.

机构、总结、中文摘要均由AI分析而来，可能存在错误，请以论文正文为准。

摘要：

英文摘要：

相关论文