探测暗物质EFT：QUEST-DMC项目：投影灵敏度和衰减上限
Probing the Dark Matter EFT with QUEST-DMC: Projected Sensitivities and Attenuation Ceilings
AI总结：
QUEST-DMC实验通过超流³He和纳米机械谐振器探测暗物质，利用低反冲能量阈值探测亚GeV暗物质，并在非相对论EFT框架下预测探测范围及耦合结构。
摘要：
本文总结了QUEST-DMC概念所预测的约束，这是一个基于表面的直接探测实验，使用在毫开尔文以下运行的超流³He，并配备由SQUID读出的纳米机械谐振器。低反冲能量阈值（对于SQUID配置降至亚电子伏特）使该实验能够探测跨多种相互作用结构的亚GeV暗物质，超越了标准的自旋无关和自旋相关限制。我们以非相对论有效场论（EFT）框架提出预测，扫描标准的十四种伽利略不变算符，并以有效暗物质-核子（或暗物质-中子）截面表达探测范围。由于QUEST-DMC在地表运行，我们还考虑了由于大气和地球中的散射导致的入射通量抑制，这在大耦合情况下会产生依赖相互作用的灵敏度上限。最后，我们概述了非相对论结果如何映射到代表性的相对论EFT暗物质-核子双线性项，从而以紫外动机的耦合结构形式简洁地解释预测的探测范围。
英文摘要：
This proceedings contribution summarises projected constraints from the QUEST-DMC concept, a surface-based direct-detection experiment using superfluid $^3$He operated below the millikelvin regime and instrumented with nanomechanical resonators read out by SQUIDs. The low recoil-energy threshold (down to sub-eV for the SQUID configuration) enables sensitivity to sub-GeV dark matter across a wide set of interaction structures beyond the canonical spin-independent and spin-dependent limits. We present projections in the non-relativistic Effective Field Theory (EFT) framework, scanning the standard set of fourteen Galilean-invariant operators and expressing reach in terms of effective dark matter-nucleon (or dark matter-neutron) cross sections. Because QUEST-DMC operates at the surface, we also account for suppression of the incident flux due to scattering in the atmosphere and Earth, which produces an interaction-dependent sensitivity ceiling at large couplings. Finally, we outline how the non-relativistic results map onto representative relativistic EFT dark matter-nucleon bilinears, enabling a compact interpretation of the projected reach in terms of UV-motivated coupling structures.
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