论文标题
希格斯玻色子至$γz$衰减，以探测风味变化的中性Yukawa联轴器
Higgs boson to $γZ$ decay as a probe of flavour changing neutral Yukawa couplings
论文作者
论文摘要
通过对希格斯粒子的更深入的研究，可以将希格斯精度测量用于间接探测新的物理学。在许多新的物理模型中，类似矢量的夸克$ t_l，〜t_r $自然发生。重要的是要探测与标准模型颗粒的耦合。在这项工作中，我们考虑了Singlet $ t_l，〜t_r $扩展模型，并展示如何通过$ h \rightarrowγZ$ decay限制$ tth $耦合。首先，我们在$ | y_ {l，〜r}^{tt} | $的其他耦合上得出了扰动的unitarity界限。为了优化情况，考虑实验约束，我们采用$ M_T $ = 400 GEV和$ S_L $ = 0.2。在这个基准点下，我们发现未来从$ h \rightarrowγZ$衰减界限可以限制$ y_ {l，〜r}^{tt} $的真实部分，因为双增强功能是o（1）。对于$ y_ {l，〜r}^{tt} $的真实部分，在负方向上，它始终被扰动的单位性超越。此外，我们发现顶级的夸克电动偶极矩可以比扰动的uniTarity和$ h \rightArrowγZ$衰减在Off-Axis区域的$ y_ {l，〜r，〜r}^{tt} $的界限更强的界限。
With the deeper study of Higgs particle, Higgs precision measurements can be served to probe new physics indirectly. In many new physics models, vector-like quarks $T_L,~T_R$ occur naturally. It is important to probe their couplings with standard model particles. In this work, we consider the singlet $T_L,~T_R$ extended models and show how to constrain the $Tth$ couplings through the $h\rightarrowγZ$ decay at high-luminosity LHC. Firstly, we derive the perturbative unitarity bounds on $|y_{L,~R}^{tT}|$ with other couplings set to be zeros simply. To optimize the situation, we take $m_T$ = 400 GeV and $s_L$ = 0.2 considering the experimental constraints. Under this benchmark point, we find that the future bounds from $h\rightarrowγZ$ decay can limit the real parts of $y_{L,~R}^{tT}$ in the positive direction to be O(1) because of the double enhancement. For the real parts of $y_{L,~R}^{tT}$ in the negative direction, it is always surpassed by the perturbative unitarity. Moreover, we find that the top quark electric dipole moment can give stronger bounds (especially the imaginary parts of $y_{L,~R}^{tT}$) than the perturbative unitarity and $h\rightarrowγZ$ decay in the off-axis regions for some scenarios.
