arXivDaily arXiv每日学术速递 周一至周五更新
arXiv 1409.6553hep-ph
收藏

Higgs-top反常耦合的探索

Exploring the Anomalous Higgs-top Couplings

Sara Khatibi, Mojtaba Mohammadi Najafabadi

摘要:

顶夸克及其大的汤川耦合对TeV尺度物理的研究具有重要意义。因此,对Higgs-top扇区的研究具有很高的动机,以寻找任何偏离标准模型预测。Higgs-top Yukawa耦合的最一般的最低阶拉格朗日量具有标量($κ$)和赝标量($\tildeκ$)分量。目前,这些耦合是间接限制使用目前的实验限制希格斯- $γ$ - $γ$和希格斯-胶子-胶子耦合。此外,利用电偶极矩(EDM)的极限得到了$κ$和$\tildeκ$的更强的界.在这项工作中,我们提出了一个不对称的可观察的$O_ϕ$在LHC生产的$t\bar{t}H$探测希格斯顶耦合和标量和赝标量组件之间的区别。我们还表明,在希格斯顶汤川耦合的赝标分量的存在下,导致一个相当大的顶夸克EDM值。结果表明,$10^{-19}$ e.cm,这是未来的$e^{-}e^{+}$对撞机实现的限制,允许我们排除在$(κ,\tildeκ)$平面中的一个显着的区域。

英文摘要:

Top quark with its large Yukawa coupling is crucially important to explore TeV scale physics. Therefore, the study of Higgs-top sector is highly motivated to look for any deviations from the standard model predictions. The most general lowest order Lagrangian for the Higgs-top Yukawa coupling has scalar ($κ$) and pseudoscalar ($\tildeκ$) components. Currently, these couplings are constrained indirectly using the present experimental limits on the Higgs-$γ$-$γ$ and Higgs-gluon-gluon couplings. Furthermore, stronger bounds on $κ$ and $\tildeκ$ are obtained using the limits on the electric dipole moments (EDM). In this work, we propose an asymmetry-like observable $O_ϕ$ in $t\bar{t}H$ production at the LHC to probe the Higgs-top coupling and to distinguish between the scalar and pseudoscalar components. We also show that the presence of the pseudoscalar component in the Higgs-top Yukawa coupling leads to a sizeable value for the top quark EDM. It is shown that a limit of $10^{-19}$ e.cm, which is achievable by the future $e^{-}e^{+}$ collider, allows us to exclude a significant region in the $(κ,\tildeκ)$ plane.

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。

↑