论文标题
Scotogenic Top-Quark FCNC衰变
Scotogenic top-quark FCNC decays
论文作者
论文摘要
由于标准模型（SM）中的Glashow-iliopoulos-Maiani机制，由于改变风味的中性电流（FCNC）顶峰衰减受到了高度抑制。如果$ t \ to q h，$ v = g，γ，z $均通过量子回路级别诱导，那么我们研究可以增强顶部FCNC的效果，直到在高光度（HL）LHC上设计的灵敏度。受Scotogenic中微子质量的机制的启发，我们通过在$ Z_2 $离散时包括$ Z_2 $ -ODD彩色费米子来扩展SM。 The results show that by taking $BR(t\to u g) \lesssim 0.61 \times 10^{-4}$ recently measured by ATLAS as an input, $t\to q γ$ can be indirectly bounded to be $BR(t\to q γ)\lesssim 3.2 \times 10^{-6}$, which is below the expected sensitivity at the HL LHC.在考虑了各种实验的潜在限制之后，循环诱导的$ t \ to q h $和$ t \ to qz $衰减的分支比率可能为$ O（10^{ - 4}）$，它属于HL LHC的敏感性。
Flavor-changing neutral current (FCNC) top-quark decays are highly suppressed due to the Glashow-Iliopoulos-Maiani mechanism in the standard model (SM). If $t\to q h, qV$ with $V=g,γ, Z$ are all induced via quantum loop levels, then we investigate the effect that can enhance the top-FCNC up to the sensitivity designed at the high-luminosity (HL) LHC. Inspired by the mechanism of the scotogenic neutrino mass, we extend the SM by including $Z_2$-odd colored fermions when a $Z_2$ discrete is imposed. The results show that by taking $BR(t\to u g) \lesssim 0.61 \times 10^{-4}$ recently measured by ATLAS as an input, $t\to q γ$ can be indirectly bounded to be $BR(t\to q γ)\lesssim 3.2 \times 10^{-6}$, which is below the expected sensitivity at the HL LHC. After taking potential constraints from various experiments into account, the obtained branching ratios for the loop-induced $t\to q h$ and $t\to qZ$ decays can be $O(10^{-4})$, which falls within the sensitivity at the HL LHC.
