论文标题
$ \ mathrm {t \ bar {t}} $ h生产的测量以及higgs boson和diphoton decay频道中的顶级夸克之间的Yukawa相互作用的CP结构
Measurements of $\mathrm{t\bar{t}}$H production and the CP structure of the Yukawa interaction between the Higgs boson and the top quark in the diphoton decay channel
论文作者
论文摘要
出现了最终状态（h $ \toγγ$）的全部重建，对$ \ mathrm {t \ bar {t}} $ h进程的首次观察，其显着性为6.6标准偏差（$σ$）。测量了希格斯玻色子耦合的CP结构，测量了最高Yukawa耦合的纯CP-ODD结构，以3.2 $σ$排除。测量结果基于在质量中心能量$ \ sqrt {s} = $ 13 TEV在LHC上收集的$ 13 TEV的质子 - 普罗顿碰撞样本，对应于137 fb $^{ - 1} $的集成亮度。 $ \ mathrm {t \ bar {t}} $ h过程的横截面时间分支的分支为$σ_{\ Mathrm {\ mathrm {t \ bar {t} h}} \ Mathcal {b}用标准模型预测为1.13 $^{+0.08} _ { - 0.11} $ fb。 CP-ODD组件的分数贡献被测量为$ f^{\ mathrm {htt}} _ \ Mathrm {cp} = $ 0.00 $ \ pm $ 0.33。
The first observation of the $\mathrm{t\bar{t}}$H process in a single Higgs boson decay channel with the full reconstruction of the final state (H$\toγγ$) is presented, with a significance of 6.6 standard deviations ($σ$). The CP structure of Higgs boson couplings to fermions is measured, resulting in an exclusion of the pure CP-odd structure of the top Yukawa coupling at 3.2$σ$. The measurements are based on a sample of proton-proton collisions at a center-of-mass energy $\sqrt{s} =$ 13 TeV collected by the CMS detector at the LHC, corresponding to an integrated luminosity of 137 fb$^{-1}$. The cross section times branching fraction of the $\mathrm{t\bar{t}}$H process is measured to be $σ_{\mathrm{t\bar{t}H}}\mathcal{B}_{γγ} =$ 1.56 $^{+0.34}_{-0.32}$ fb, which is compatible with the standard model prediction of 1.13 $^{+0.08}_{-0.11}$ fb. The fractional contribution of the CP-odd component is measured to be $f^{\mathrm{Htt}}_\mathrm{CP} =$ 0.00 $\pm$ 0.33.
