论文标题
中微子实验中暗部门的不可知论探针
Model Agnostic Probes of Dark Sectors at Neutrino Experiments
论文作者
论文摘要
当前和即将进行的中微子实验可以对与标准模型相互作用的黑暗领域具有相当大的敏感性。我们认为黑暗部门通过不相关的门户与SM相互作用，这些门户是基于一般原则的动机。我们通过考虑中微子检测器内部的黑暗扇区激发的衰减来得出界限，并从目标下游放置。我们的方法是模型不可知论，适用于强烈和弱耦合的广泛的黑暗扇区模型。在这种方法中，黑暗扇区的特征是两个量表：$λ_\ text {uv} $（质量生成门户的质量）和$λ_\ text {ir} $（黑暗扇区的质量间隙）。在远离这些尺度的中间能量中，该理论近似比例不变。尽管需要一些温和的模型依赖性假设，但这允许计算与阈值校正无关的生产率。我们查看与中微子实验相关的各种黑暗部门生产过程，例如介子腐烂，直接的partonic生产和深色bremsstrahlung。我们考虑了来自过去（魅力），现在（伊卡洛斯，新星，微酮）和即将到来的未来（Dune-MPD）的代表性实验，并将其与高能实验（LHC和LEP）和专用的未来LLP实验（船舶）的现有界限进行比较。我们发现，TEV范围内即将推出的Dune-MPD可以在0.1-1 GEV系列中探测$λ_\ text {uv} $，$λ_\ text {ir} $在0.1-1 GEV系列中，涵盖了当前在高能实验中无法访问的参数空间的一部分，并且是固定的目标/束/束式实验实验，并且与未来的实验相比。通常，未来的中微子实验可以是对黑暗领域的有效探测，从而提供了参数空间中的互补和新覆盖范围。
Present and upcoming neutrino experiments can have considerable sensitivity to dark sectors that interact feebly with the Standard Model. We consider dark sectors interacting with the SM through irrelevant portals that are motivated on general principles. We derive bounds on such scenarios by considering decays of dark sector excitations inside the neutrino detector, placed downstream from the target. Our approach is model agnostic and applies to a wide range of dark sector models, both strongly and weakly coupled. In this approach, the dark sector is characterized by two scales: $Λ_\text{UV}$ (mass of mediators generating the portals) and $Λ_\text{IR}$ (mass gap of the dark sector). At intermediate energies, far away from these scales, the theory is approximately scale-invariant. This allows the calculation of production rates independent of the threshold corrections, although some mild model-dependent assumptions are needed. We look at various dark sector production processes relevant at neutrino experiments such as meson decays, direct partonic production, and dark bremsstrahlung. We consider representative experiments from past (CHARM), present (ICARUS, NOvA, MicroBooNE), and upcoming future (DUNE-MPD), and compare their reach to existing bounds from high energy experiments (LHC and LEP) and dedicated future LLP experiments (SHiP). We find that the upcoming DUNE-MPD can probe $Λ_\text{UV}$ in the TeV range, and $Λ_\text{IR}$ in the 0.1-1 GeV range, covering parts of parameter space currently inaccessible in high energy experiments and fixed-target/beam-dump experiments, and is comparable to future LLP experiments. In general, future neutrino experiments can be an efficient probe of dark sectors, providing complementary as well as new reach in parameter space.
