赝标量介导暗物质的自旋无关散射
Spin-independent scattering of pseudoscalar-mediated dark matter
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中文总结 AI 辅助
该研究在亚电弱有效场论框架下计算赝标量介导暗物质的一圈自旋无关散射，发现其可产生高于中微子地板的信号，但需引入TeV以下新物理。
中文摘要 AI 辅助
具有赝标量耦合的暗物质提供了一个动机良好的场景，其中直接探测信号在树级被抑制，因为与原子核的散射既是自旋相关的又受到动量抑制。虽然自旋无关散射在树级不存在，但它在一圈图出现，并可提供主要的直接探测信号。我们在一个包含光赝标量介体的一般亚电弱有效场论中重新审视这一场景，包括直至质量维度为六的相互作用。我们计算到与直接探测相关的夸克和胶子算符的匹配，以确定该场景是否能在未来的实验中被探测到，同时要求与观测到的暗物质遗迹丰度和间接探测限制保持一致。我们发现，虽然具有赝标量介体的模型可以产生高于中微子地板的自旋无关截面，但这通常需要低于TeV能标的新物理。
英文摘要
Dark matter with pseudoscalar couplings provides a well-motivated scenario in which direct-detection signals are suppressed at tree level, since the scattering off nuclei is both spin-dependent and momentum suppressed. While spin-independent scattering is absent at tree level, it arises at one loop and can provide the leading direct-detection signal. We revisit this scenario in a general sub-electroweak effective field theory with a light pseudoscalar mediator, including interactions through to mass-dimension-six. We compute the matching onto the quark and gluon operators relevant for direct detection to determine whether this scenario could be detectable at future experiments, while also requiring consistency with the observed dark matter relic-abundance and indirect-detection limits. We find that while models with a pseudoscalar mediator can generate spin-independent cross sections above the neutrino floor, this generally requires additional new physics below the TeV scale.
发表机构
- ARC Centre of Excellence for Dark Matter Particle Physics（暗物质粒子物理卓越中心）
- School of Physics, The University of Melbourne（墨尔本大学物理学院）
- CSSM, Department of Physics, Adelaide University（阿得雷德大学物理系与空间科学数学研究所）
机构由 AI 辅助整理，请以论文原文为准。
