论文标题
通过$ h \ toγγ$通道在HE-LHC和FCC-HH上探测顶级的玻色子FCNC耦合
Probing the top-Higgs boson FCNC couplings via the $h\to γγ$ channel at the HE-LHC and FCC-hh
论文作者
论文摘要
我们调查了未来对顶级玻色子风味变化中性电流（FCNC）耦合的敏感性$ tqh $〜（$ q = u，c $）在拟议的高能大型强体撞机〜（HE-LHC）和HADRON-HADRON-HADRON模式（FCC-HH）中的未来的圆形冲突（FCC-HH）。我们对$ H \至γγ$衰减通道（其中$ h $是发现的希格斯州）进行的两个过程进行了完整的模拟：与Higgs Boson（加上JET）和Top Quark Pair生产有关的单个顶级夸克FCNC生产，带有FCNC Decays $ t \ to qH $。所有相关的背景都在基于剪切的分析中考虑，以获得$ t \ to uh $和$ t \ to ch $的分支比率（BRS）的限制。结果表明，在HE-LHC上，集成的光度为15 ab $^{ - 1} $，在FCC-HH上，集成的光度为30 ab $^{ - 1} $，{{br（$ t \ to uh $）（br（$ t \ uh $）（br（$ t \ to ch $ to ch $））可以分别进行，分别为$ 7.0和$ 7.0（$ 7.0）（$ 7.0〜（to $ 7.0）（to to $ 7.0〜（$ 7.0）〜（\ 5） $ 2.3〜（3.0）\ times 10^{ - 5} $在95 \％置信度（CL）（假设背景上存在10 \％的系统不确定性），这比当前的13 TEV LHC LHC实验结果要好几乎两个数量级。
We investigate the sensitivity of future searches for the top-Higgs boson Flavour Changing Neutral Current (FCNC) couplings $tqh$~($q= u, c$) at the proposed High Energy Large Hadron Collider~(HE-LHC) and Future Circular Collider in hadron-hadron mode (FCC-hh). We perform a full simulation for two processes in the $h\to γγ$ decay channel (where $h$ is the discovered Higgs state): single top quark FCNC production in association with the Higgs boson (plus a jet) and top quark pair production with FCNC decays $t\to qh$. All the relevant backgrounds are considered in a cut based analysis to obtain the limits on the Branching Ratios (BRs) of $t\to uh$ and $t\to ch$. It is shown that, at the HE-LHC with an integrated luminosity of 15 ab$^{-1}$ and at the FCC-hh with an integrated luminosity of 30 ab$^{-1}$, {{the BR($t\to uh$) (BR($t\to ch$)) can be probed, respectively, to $7.0~(8.5)\times 10^{-5}$ and $2.3~(3.0) \times 10^{-5}$ at the 95\% Confidence Level (CL) (assuming a 10\% systematic uncertainty on the background), which is almost two orders of magnitude better than the current 13 TeV LHC experimental results.
