论文标题
在HL-LHC，He-LHC和FCC-HH的三立蛋白信号中探测TQZ异常耦合
Probing tqZ anomalous couplings in the trilepton signal at the HL-LHC, HE-LHC and FCC-hh
论文作者
论文摘要
我们通过两个生产过程来研究发现风味变化的中性电流（FCNC）$ TQZ $耦合的前景：顶级Quark Pair Producation $ PP \ to T \ bar {t} $，其中一个顶级腐烂到$ z $ boson和$ z $ boson和一个轻型Jot and a nomalous Singles top top $ z $ boson $ boson $ boson $ pp $ pp。我们研究了大型强子对撞机〜（LHC）的各种后继者，即认可的高亮度LHC（HL-LHC），以及拟议的高能量LHC〜（HE-LHC）和在Hadron-Hadron模式（FCC-HH）中提出的高能量LHC（HE-LHC）和未来的圆形撞机。我们对信号和相关标准模型（SM）背景执行完整的模拟，并获得$ t \ to qz〜（q = u，c）$的分支比率（BRS）的限制，最终通过衰减模式$ t \ t \ w^{+} \ to b \ ell^el^el^el^Z $ t \ z = \ ell^{+} \ ell^{ - } $。这些FCNC BRS在95 \％置信度（Cl）上的上限是在HL-LHC处获得的，$ \ sqrt s = 14 $ tev和3 ab $^{ - 1} $，he-lhc，he-lhc，$ \ sqrt s = 27 $ = 27 $ tev和15 ab $^$^{ - 1} $及$^{ - 1} $及30 $ ust tev and yt tev and yt tev fcc and y y y at te = sev and pcc-hh， ab $^{ - 1} $。
We investigate the prospects for discovering the Flavour Changing Neutral Current (FCNC) $tqZ$ couplings via two production processes yielding trilepton signals: top quark pair production $pp\to t\bar{t}$ with one top decaying to the $Z$ boson and one light jet and the anomalous single top plus $Z$ boson production process $pp\to tZ$. We study these channels at various successors of the Large Hadron Collider~(LHC), i.e., the approved High-Luminosity LHC (HL-LHC) as well as the proposed High-Energy LHC~(HE-LHC) and Future Circular Collider in hadron-hadron mode (FCC-hh). We perform a full simulation for the signals and the relevant Standard Model (SM) backgrounds and obtain limits on the Branching Ratios (BRs) of $t\to qZ~(q=u,c)$, eventually yielding a trilepton final state through the decay modes $t\to b W^{+}\to b\ell^{+}ν_{\ell}$ and $Z\to \ell^{+}\ell^{-}$. The upper limits on these FCNC BRs at 95\% Confidence Level (CL) are obtained at the HL-LHC with $\sqrt s=14$ TeV and 3 ab$^{-1}$, at the HE-LHC with $\sqrt s=27$ TeV and 15 ab$^{-1}$ as well as at the FCC-hh with $\sqrt s=100$ TeV and 30 ab$^{-1}$.
