论文标题
$ z $ -BOSON在LHC，HL-LHC和Future Lepton Colliders中腐烂到一个无形的深色光子
$Z$-boson decays into an invisible dark photon at the LHC, HL-LHC and future lepton colliders
论文作者
论文摘要
我们将$ z $ vector Boson的衰变纳入光子和高能碰撞中的无质量（无形）暗光子。光子可以用作事件的触发因素，而在事件最终状态中，将暗光子间接地视为缺失动量。我们研究了在LHC，HL-LHC和Future Lepton Colliders上搜索这种暗光子的可能性，并比较各自的敏感性。正如预期的那样，对于以$ z $质量，FCC-EE和CEPC运行的Lepton Colliders的最佳结果，对订单$ O（10^{ - 11}）$的分支比率的最终敏感性。我们还讨论了如何使用Lepton碰撞中事件的光子角分布来区分黑暗光子和伪轴状态（如轴）。
We study the decay of the $Z$ vector boson into a photon and a massless (invisible) dark photon in high-energy collisions. The photon can be used as trigger for the event, while the dark photon is detected indirectly as missing momentum in the event final state. We investigate the possibility of searching for such a dark photon at the LHC, HL-LHC and future lepton colliders, and compare the respective sensitivities. As expected, the best result is found for the lepton colliders running at the $Z$ mass, FCC-ee and CEPC, with a final sensitivity to branching ratios of order $O(10^{-11})$. We also discuss how to use the photon angular distribution of the events in lepton collisions to discriminate between the dark photon and a pseudo-scalar state like the axion.
