论文标题
在proton-proton碰撞中，在$ \ sqrt {s} $ = 13 TEV中搜索proton-proton碰撞中的$ cp $违规和TH生产。
Search for $CP$ violation in ttH and tH production in multilepton channels in proton-proton collisions at $\sqrt{s}$ = 13 TeV
论文作者
论文摘要
Yukawa（H）玻色子和顶级夸克之间的Yukawa相互作用的电荷 - 含量（$ cp $）的结构是在$ \ mathrm {t \ bar {t}} $中的数据样本中测量的通过CERN LHC的CMS实验。该研究针对的是H玻色子通过H $ \ to $ ww或H $ \ to $ $ττ$腐烂的事件，而最终的Quarks衰减是通过T $ \ to $ WB衰减的：W型玻色子腐烂或强调衰减，并且最终状态是至少存在两个Leptons的表征。机器学习技术适用于这些最终状态，以增强$ CP $的分离 - 即使从$ CP $ -ODD方案中。二维置信区域设置为$κ__\ mathrm {t} $和$ \tildeκ_\ Mathrm {t} $，它们的定义分别定义为$ cp $ -even和$ cp $ -CP $ -ODD TOP-HIGGS YUKAWA YUKAWA YUKAWA COUPLING COUPLING修饰。观察到没有明显的分数$ cp $ -odd贡献，由数量$ \ lvert {f_ {cp}^{\ mathrm {htt}}}} \ rvert $进行参数；该参数被确定为$ \ lvert {f_ {cp}^{\ mathrm {htt}}}}} \ rvert $ = 0.59，间隔为68％的置信度（0.24，0.81）。结果与先前的结果结合在一起，涵盖了h $ \ to $ zz和h $ \ to $ $γγ$衰减模式，在$κ__\ mathrm {t} $和$ \tildeκ_\ mathrm {t} $上产生了两维的信心区域，而$ \ lvert {f_ {cp}^{\ mathrm {\ mathrm {htt}}}} \ rvert $确定为$ \ lvert {f_ {f_ {cp}^{\ mathrm {htt}}}} \ rvert $ = 0.28 $ \ lvert {f_ {cp}^{\ Mathrm {\ Mathrm {htt}}} \ rvert $ $ $ $ \ lt $ 0.55在68％的置信度下，与标准模型$ cp $ - even的预测$ \ \ lvert的预测一致。
The charge-parity ($CP$) structure of the Yukawa interaction between the Higgs (H) boson and the top quark is measured in a data sample enriched in the $\mathrm{t\bar{t}}$ and tH associated production, using 138 fb$^{-1}$ of data collected in proton-proton collisions at $\sqrt{s}$ = 13 TeV by the CMS experiment at the CERN LHC. The study targets events where the H boson decays via H $\to$ WW or H $\to$ $ττ$ and the top quarks decay via t $\to$ Wb: the W bosons decay either leptonically or hadronically, and final states characterized by the presence of at least two leptons are studied. Machine learning techniques are applied to these final states to enhance the separation of $CP$-even from $CP$-odd scenarios. Two-dimensional confidence regions are set on $κ_\mathrm{t}$ and $\tildeκ_\mathrm{t}$, which are respectively defined as the $CP$-even and $CP$-odd top-Higgs Yukawa coupling modifiers. No significant fractional $CP$-odd contributions, parameterized by the quantity $\lvert{f_{CP}^{\mathrm{Htt}}}\rvert$ are observed; the parameter is determined to be $\lvert{f_{CP}^{\mathrm{Htt}}}\rvert$ = 0.59 with an interval of (0.24, 0.81) at 68% confidence level. The results are combined with previous results covering the H $\to$ ZZ and H $\to$ $γγ$ decay modes, yielding two- and one-dimensional confidence regions on $κ_\mathrm{t}$ and $\tildeκ_\mathrm{t}$, while $\lvert{f_{CP}^{\mathrm{Htt}}}\rvert$ is determined to be $\lvert{f_{CP}^{\mathrm{Htt}}}\rvert$ = 0.28 with an interval of $\lvert{f_{CP}^{\mathrm{Htt}}}\rvert$ $\lt$ 0.55 at 68% confidence level, in agreement with the standard model $CP$-even prediction of $\lvert{f_{CP}^{\mathrm{Htt}}}\rvert$ = 0.
