论文标题
$ cp $ higgs玻色子的属性与$ t \ bar {t} h $中的顶级夸克和使用$ h \rightarrowγγ$与Atlas检测器一起使用$ t \ bar {t} h $和$ th $
$CP$ Properties of Higgs Boson Interactions with Top Quarks in the $t\bar{t}H$ and $tH$ Processes Using $H \rightarrow γγ$ with the ATLAS Detector
论文作者
论文摘要
提出了对希格斯玻色子与顶级夸克之间相互作用的$ CP $属性的研究。 Higgs玻色子是通过Diphoton Decay频道（$ h \rightarrowγγ$）鉴定的，它们与顶级夸克对（$ t \ bar {t} h $）或单个顶级夸克（$ th $）的生产进行了研究。该分析使用139 fb $^{ - 1} $的质子 - 普罗顿碰撞数据记录在$ \ sqrt {s} $ = 13 tev的质量中心能量中，并带有大型强子对撞机的地图集检测器。假设$ cp $ - 几点耦合，则观察到$ t \ bar {t} h $进程的显着性为5.2标准偏差。测得的横截面$ h \至γγ$分支比为$ 1.64 \;^{+0.38} _ { - 0.36} \; \ text {（stat。 $ t \ bar {t} h $是$ 1.43 \;^{+0.33} _ { - 0.31} \; \; \ text {（stat。未观察到$ TH $生产过程，其设定了标准模型期望的12倍的上限。 $ cp $ - 混合角度大于43（-43）$^\ circ $的置信度为95％。
A study of the $CP$ properties of the interaction between the Higgs boson and top quarks is presented. Higgs bosons are identified via the diphoton decay channel ($H \rightarrow γγ$) and their production in association with a top quark pair ($t\bar{t}H$) or single top quark ($tH$) is studied. The analysis uses 139 fb$^{-1}$ of proton-proton collision data recorded at a center-of-mass energy of $\sqrt{s}$ = 13 TeV with the ATLAS detector at the Large Hadron Collider. Assuming a $CP$-even coupling, the $t\bar{t}H$ process is observed with a significance of 5.2 standard deviations. The measured cross section times $H \to γγ$ branching ratio is $1.64\;^{+0.38}_{-0.36}\;\text{(stat.)}\;^{+0.17}_{-0.14}\;(\text{sys.})$ fb, and the measured rate for $t\bar{t}H$ is $1.43\;^{+0.33}_{-0.31}\;\text{(stat.)}\;^{+0.21}_{-0.15}\;(\text{sys.})$ times the Standard Model expectation. The $tH$ production process is not observed and an upper limit on its rate of 12 times the Standard Model expectation is set. A $CP$-mixing angle greater (less) than 43 (-43)$^\circ$ is excluded at 95% confidence level.
