标题： 探测未来实验中的轻暗标量 显示英文标题

标题： Probing light dark scalars with future experiments

摘要： 我们研究一个包含一对轻型非简并标量粒子的暗物质领域，其质量在MeV-GeV范围内，并通过更重的媒介粒子与可见领域耦合。最重的暗态是长寿命的，其衰变提供了新的可检验信号。我们分析了利用提议的束流散射设施SHiP以及提议的LHC实验FASER和MATHUSLA进行探测的可能性。此外，我们还考虑了来自束流散射实验CHARM以及对撞机（LEP、LHC和BaBar）的限制。我们既从有效场论的角度，其中更重的媒介粒子已被积分掉，也从包含一个矢量玻色子媒介的简化模型的角度展示了我们的结果，该媒介可以是重的$\gtrsim\mathcal{O}(1)$ TeV，或者是轻的$\mathcal{O}(10)$ GeV。我们表明，未来的实验可以检验目前尚未探索的参数空间的大部分区域，并且它们与未来高亮度LHC搜索是互补的。 显示英文摘要

摘要： We investigate a dark sector containing a pair of light non-degenerate scalar particles, with masses in the MeV-GeV range, coupled to the visible sector through heavier mediators. The heaviest dark state is long-lived, and its decays offer new testable signals. We analyze the prospects for detection with the proposed beam-dump facility SHiP, and the proposed LHC experiments FASER and MATHUSLA. Moreover, we consider bounds from the beam-dump experiment CHARM and from colliders (LEP, LHC and BaBar). We present our results both in terms of an effective field theory, where the heavy mediators have been integrated out, and of a simplified model containing a vector boson mediator, which can be heavy $\gtrsim\mathcal{O}(1)$ TeV, or light $\mathcal{O}(10)$ GeV. We show that future experiments can test large portions of the parameter space currently unexplored, and that they are complementary to future High-Luminosity LHC searches.