论文标题
从$ \ mathrm {t \ bar {t}} $ kinematic发行版的proton-proton碰撞中的$ \ sqrt {s} = $ 13 tev的测量
Measurement of the top quark Yukawa coupling from $\mathrm{t\bar{t}}$ kinematic distributions in the dilepton final state in proton-proton collisions at $\sqrt{s} =$ 13 TeV
论文作者
论文摘要
使用Proton-Proton碰撞数据$ \ sqrt {s} = $ 13 TEV对Higgs Boson Yukawa耦合到顶部的夸克，对应于137 fb $^{ - 1} $，记录在CMS探测器上。相对于标准模型值的耦合强度，$ y_ \ mathrm {t} $，是根据$ \ mathrm {t \ bar {t}} $最终状态含有ee，$μun$ $或e $ $ $ $ $ pairs确定的。 Yukawa耦合强度的变化导致$ \ mathrm {t \ bar {t}} $生产的修改分布。特别是，$ \ mathrm {t \ bar {t}} $ system的质量分布以及顶级夸克和古夸克的速度差异对$ y_ \ m athrm {t} $的值敏感。该测量值的最佳拟合值为$ y_ \ mathrm {t} = $ 1.16 $^{+0.24} _ { - 0.35} $，边界$ y_ \ mathrm {t} $ $ \ lt $ \ lt $ 1.54在95％的信心水平下。
A measurement of the Higgs boson Yukawa coupling to the top quark is presented using proton-proton collision data at $\sqrt{s} =$ 13 TeV, corresponding to an integrated luminosity of 137 fb$^{-1}$, recorded with the CMS detector. The coupling strength with respect to the standard model value, $Y_\mathrm{t}$, is determined from kinematic distributions in $\mathrm{t\bar{t}}$ final states containing ee, $μμ$, or e$μ$ pairs. Variations of the Yukawa coupling strength lead to modified distributions for $\mathrm{t\bar{t}}$ production. In particular, the distributions of the mass of the $\mathrm{t\bar{t}}$ system and the rapidity difference of the top quark and antiquark are sensitive to the value of $Y_\mathrm{t}$. The measurement yields a best fit value of $Y_\mathrm{t} =$ 1.16 $^{+0.24}_{-0.35}$, bounding $Y_\mathrm{t}$ $\lt$ 1.54 at a 95% confidence level.
