离轴液态氩中微子探测器上的暗三叉戟
Dark Tridents at Off-Axis Liquid Argon Neutrino Detectors
摘要：
我们提出了暗三叉戟，一个新的渠道，探索暗部门在短基线中微子实验。暗三叉戟是干净的，独特的事件，就像中微子三叉戟一样，一个非常弱耦合的粒子的散射导致轻子-反轻子对的产生。暗三叉戟的产生发生在长寿命的暗扇区粒子与中微子一起在束流转储环境中产生的模型中，并与下游的中微子探测器相互作用，产生一个壳层玻色子，衰变为一对带电轻子。我们专注于一个简单的模型，其中暗物质粒子与标准模型相互作用完全通过一个暗光子，并集中在该区域的参数空间的暗光子质量小于两倍的暗物质粒子，因此完全衰变成标准模型粒子。我们计算事件发生率，并讨论搜索策略的暗三叉戟从暗物质在当前和即将到来的液氩探测器对准的助推器光束在费米实验室- MicroBooNE，SBND，和ICARUS -假设暗扇区粒子产生离轴在更高的能量NuMI光束。我们发现，MicroBooNE已经记录了足够的数据，与现有的界限在这个黑暗的部门模型的竞争，和参数空间的新区域将探索与未来的数据和实验。
英文摘要：
We present dark tridents, a new channel for exploring dark sectors in short-baseline neutrino experiments. Dark tridents are clean, distinct events where, like neutrino tridents, the scattering of a very weakly coupled particle leads to the production of a lepton--antilepton pair. Dark trident production occurs in models where long-lived dark-sector particles are produced along with the neutrinos in a beam-dump environment and interact with neutrino detectors downstream, producing an on-shell boson which decays into a pair of charged leptons. We focus on a simple model where the dark matter particle interacts with the standard model exclusively through a dark photon, and concentrate on the region of parameter space where the dark photon mass is smaller than twice that of the dark matter particle and hence decays exclusively into standard-model particles. We compute event rates and discuss search strategies for dark tridents from dark matter at the current and upcoming liquid argon detectors aligned with the Booster beam at Fermilab -- MicroBooNE, SBND, and ICARUS -- assuming the dark sector particles are produced off-axis in the higher energy NuMI beam. We find that MicroBooNE has already recorded enough data to be competitive with existing bounds on this dark sector model, and that new regions of parameter space will be probed with future data and experiments.
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